{"title":"BigBattery","description":"\u003cp\u003eBigBattery ETHOS and NEXUS LiFePO4 energy storage — stackable home ESS and high-capacity off-grid kits paired with EG4 and APEX inverters.\u003c\/p\u003e","products":[{"product_id":"bigbattery-ethos-eg4-18kpv-hybrid-inverter-kit-10-24-30-72-kwh-whole-home-solar-ess","title":"BigBattery ETHOS + EG4 18kPV Hybrid Inverter Kit | 10.24–30.72 kWh | Whole-Home Solar ESS","description":"\u003cp\u003eThis kit pairs BigBattery's stackable ETHOS 48V LiFePO4 battery platform with the \u003ca href=\"\/products\/eg4-18kpv-all-in-one-hybrid-solar-inverter-18-kw-pv-12-kw-ac-split-phase\"\u003eEG4 18kPV all-in-one hybrid inverter\u003c\/a\u003e. Per EG4, the 18kPV accepts 18 kW of PV input across three MPPTs and delivers 12 kW of continuous split-phase 120\/240V output, with grid-tied, grid-assist, and off-grid modes in one wall-mounted unit. ETHOS storage in this listing is configurable from 10.24 to 30.72 kWh, and per BigBattery the two operate with closed-loop communication for coordinated charging and accurate state-of-charge reporting.\u003c\/p\u003e\n\n\u003ch2\u003eWho This System Is For\u003c\/h2\u003e\n\u003cp\u003eHomeowners who want one inverter to manage solar, battery, grid, and generator power — whether the goal is solar self-consumption, time-of-use offset, backup for essential circuits, or a path toward broader home coverage. Because ETHOS stacks in 5.12 kWh steps, this kit suits buyers who want to start with the storage they need now and grow later without replacing equipment.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e18 kW of PV input across three MPPTs\u003c\/strong\u003e, per EG4 — headroom for large rooftop or ground-mount arrays\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e12 kW continuous split-phase output\u003c\/strong\u003e (120\/240V or 120\/208V), per EG4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrid-tied, grid-assist, and off-grid modes\u003c\/strong\u003e, including selling excess power back to the grid where your utility approves interconnection, per EG4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCertified battery platform:\u003c\/strong\u003e ETHOS carries UL9540, UL9540A, UL1973, and UN38.3, per BigBattery; the 18kPV is UL1741 SB listed with CEC and CSIP compliance, per EG4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClosed-loop communication\u003c\/strong\u003e between ETHOS and the inverter, per BigBattery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExpandable both ways:\u003c\/strong\u003e stack additional ETHOS modules (up to 16 parallel connections per control box, per BigBattery) or parallel up to 10 inverters, per EG4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSmall-footprint tower:\u003c\/strong\u003e ETHOS modules stack vertically instead of spreading across a wall\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy BigBattery\u003c\/h2\u003e\n\u003cp\u003eBigBattery is a US-based energy storage company that has been building lithium battery systems since 2011 and, per BigBattery, is trusted by more than 50,000 Americans. BigBattery states its products are designed and engineered in Texas, includes free lifetime tech support with every product, and backs its batteries with a 12-Year Limited Warranty — described by BigBattery as \"the longest warranty in the battery industry.\" OffGrid Horizon is a family-owned authorized BigBattery partner.\u003c\/p\u003e\n\n\u003ch2\u003eWhat's In the Kit\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1 × EG4 18kPV all-in-one hybrid solar inverter\u003c\/li\u003e\n\u003cli\u003eBigBattery ETHOS 48V 5.12 kWh LiFePO4 modules — capacity for this listing is configurable from 10.24 to 30.72 kWh (2–6 modules)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003ePlease call (302) 496-3554 to confirm the module count and configuration that ships at the listed price.\u003c\/strong\u003e BigBattery lists ETHOS inverter connectors and battery-to-battery connectors as separate accessories, so also confirm cabling with your order. Solar panels, racking, and array wiring are sold separately. For whole-home load management, AC coupling, and generator integration, ask about adding the \u003ca href=\"\/products\/eg4-gridboss-200a-mid-microgrid-interconnection-device\"\u003eEG4 GridBOSS MID\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBattery\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBigBattery ETHOS, stackable LiFePO4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModule capacity\u003c\/td\u003e\n\u003ctd\u003e5.12 kWh \/ 100Ah per module, 51.2V nominal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCapacity (this listing)\u003c\/td\u003e\n\u003ctd\u003eConfigurable 10.24–30.72 kWh — call to confirm configuration\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax continuous discharge\u003c\/td\u003e\n\u003ctd\u003e200A (2-module stack) \/ 250A (3+ modules), per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery communications\u003c\/td\u003e\n\u003ctd\u003eCAN bus \/ RS485; closed-loop with EG4, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery certifications\u003c\/td\u003e\n\u003ctd\u003eUL9540, UL9540A, UL1973, UN38.3, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCycle life\u003c\/td\u003e\n\u003ctd\u003e3,500–5,000 cycles (80% DoD, 0.5C), per BigBattery's spec sheet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery warranty\u003c\/td\u003e\n\u003ctd\u003eBigBattery 12-Year Limited Warranty\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInverter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEG4 18kPV all-in-one hybrid (per EG4)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePV input\u003c\/td\u003e\n\u003ctd\u003e18 kW max, 600V DC input, 3 MPPTs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAC output\u003c\/td\u003e\n\u003ctd\u003e12 kW continuous, split-phase 120\/240V or 120\/208V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating modes\u003c\/td\u003e\n\u003ctd\u003eGrid-tied (with export), grid-assist, off-grid, battery backup\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParallel capability\u003c\/td\u003e\n\u003ctd\u003eUp to 10 units\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInverter certifications\u003c\/td\u003e\n\u003ctd\u003eUL1741 SB, NEMA 4X, CEC, CSIP\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInverter warranty\u003c\/td\u003e\n\u003ctd\u003e10-year, per EG4 (registration required — see below)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eGrid-Tied, Off-Grid, or Backup?\u003c\/h2\u003e\n\u003cp\u003eAll three. Per EG4, the 18kPV supports grid-tied operation with export (subject to your utility's interconnection approval), grid-assist and self-consumption modes that favor solar and battery over grid power, true off-grid operation, and battery backup during outages. Whole-home backup is possible with adequate inverter capacity and load management, but coverage is load-dependent — a 12 kW inverter carries most household circuits, and heavy simultaneous 240V loads should be reviewed during system design. The system also runs without solar panels as grid-charged battery backup.\u003c\/p\u003e\n\n\u003ch2\u003eInstallation\u003c\/h2\u003e\n\u003cp\u003eAll AC and DC wiring — panel interconnection, grounding, bonding, and overcurrent protection — must be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and local amendments. Residential energy storage installations typically require a permit and inspection, and grid-tied operation requires an approved interconnection agreement with your utility before the system may export power. Your installer should verify conductor sizing, disconnects, and clearances against current NEC requirements for energy storage systems.\u003c\/p\u003e\n\n\u003ch2\u003eWarranty \u0026amp; Support\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eBattery — BigBattery 12-Year Limited Warranty.\u003c\/strong\u003e Per BigBattery: \"If any covered component within your battery fails due to a defect in materials or workmanship within the 12-year warranty period, we will repair or replace the battery at our cost.\" Included accessories carry a 1-year warranty per BigBattery, and BigBattery provides free lifetime tech support for all its products.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInverter — EG4 10-year warranty.\u003c\/strong\u003e Per EG4, the 18kPV carries a \"10-year Full Parts Replacement or Full Product Replacement Warranty from the date of original inverter purchase,\" and the warranty must be registered within the first year of purchase (or proof of purchase from an EG4 authorized distributor provided) to remain valid.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eReturns and warranty claims require an RMA.\u003c\/strong\u003e Contact us before shipping anything back — all returns must be authorized with a Return Merchandise Authorization first. OffGrid Horizon is a family-owned authorized BigBattery partner: call (302) 496-3554 and we will help open the claim and coordinate service.\u003c\/p\u003e\n\n\u003ch2\u003eShipping\u003c\/h2\u003e\n\u003cp\u003eThis kit ships as palletized LTL freight within the continental United States; curbside liftgate delivery is standard for residential addresses. ETHOS towers are heavy — 273 lb for a two-module stack per BigBattery — so plan for help on delivery day. Before signing the delivery receipt, count the pieces and inspect the packaging; note any damage or shortage on the receipt with the driver and contact us immediately so we can open a freight claim. Per BigBattery, standard domestic orders are projected to take 7–12 days to deliver.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eWhat exactly ships at the listed price?\u003c\/h3\u003e\n\u003cp\u003eThis listing covers the EG4 18kPV inverter plus ETHOS battery storage configurable from 10.24 to 30.72 kWh. Call (302) 496-3554 before ordering and we will confirm the module count, included accessories, and any configuration options for this SKU.\u003c\/p\u003e\n\u003ch3\u003eCan it sell power back to the grid?\u003c\/h3\u003e\n\u003cp\u003eYes — per EG4, the 18kPV supports grid export and is UL1741 SB listed with CSIP compliance. Export always requires an approved interconnection agreement with your utility.\u003c\/p\u003e\n\u003ch3\u003eWill this back up my whole home?\u003c\/h3\u003e\n\u003cp\u003eIt depends on your loads. 12 kW of continuous output covers most household circuits, and pairing with the EG4 GridBOSS adds smart-load and generator management — but whole-home coverage is load-dependent and should be confirmed during design.\u003c\/p\u003e\n\u003ch3\u003eDoes it work without solar panels?\u003c\/h3\u003e\n\u003cp\u003eYes. The system operates as grid-charged battery backup, and panels can be added later — the 18kPV accepts up to 18 kW of PV, per EG4.\u003c\/p\u003e\n\u003ch3\u003eCan I add more battery later?\u003c\/h3\u003e\n\u003cp\u003eYes. ETHOS is a stacking platform — per BigBattery, up to 16 parallel connections per control box — so capacity grows in 5.12 kWh steps without replacing the inverter.\u003c\/p\u003e\n\u003ch3\u003eDo the battery and inverter communicate?\u003c\/h3\u003e\n\u003cp\u003eYes — per BigBattery, ETHOS runs closed-loop communication with compatible EG4 inverters over CAN bus for coordinated charging and accurate state-of-charge reporting.\u003c\/p\u003e\n\u003ch3\u003eWill the battery charge in freezing weather?\u003c\/h3\u003e\n\u003cp\u003ePer BigBattery, the ETHOS charge temperature range is 32°F to 113°F; the BMS restricts charging below freezing, so install the tower in an insulated or conditioned space in cold climates.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003eNot sure which capacity fits your home? Call OffGrid Horizon at (302) 496-3554 — we're a family-owned authorized BigBattery partner and will help you size the system before you order.\u003c\/em\u003e\u003c\/p\u003e","brand":"BigBattery","offers":[{"title":"2 × ETHOS — 10.24 kWh","offer_id":49051014824091,"sku":"K0954","price":7755.0,"currency_code":"USD","in_stock":true},{"title":"3 × ETHOS — 15.36 kWh","offer_id":49051014856859,"sku":"K0955","price":9015.0,"currency_code":"USD","in_stock":true},{"title":"4 × ETHOS — 20.48 kWh","offer_id":49051014889627,"sku":"K0956","price":10490.0,"currency_code":"USD","in_stock":true},{"title":"6 × ETHOS — 30.72 kWh","offer_id":49051014922395,"sku":"K0957","price":12094.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0746\/0614\/9787\/files\/10-kWh-x2-Batteries-KIT0954-V2.png?v=1784676093"},{"product_id":"bigbattery-ethos-eg4-flexboss18-kit-10-24-30-72-kwh-split-phase-home-ess","title":"BigBattery ETHOS + EG4 FlexBOSS18 Kit | 10.24–30.72 kWh | Split-Phase Home ESS","description":"\u003cp\u003eThis kit pairs BigBattery's stackable ETHOS 48V LiFePO4 battery platform with the \u003ca href=\"\/products\/eg4-flexboss18-hybrid-solar-inverter-18-kw-pv-13-kw-ac-split-phase-3-mppt\"\u003eEG4 FlexBOSS18 hybrid inverter\u003c\/a\u003e. Per EG4, the FlexBOSS18 delivers 13 kW of continuous output (10 kW on battery alone) with up to 18 kW of solar input utilization; per BigBattery's FlexBOSS18 listing it is a split-phase, 3-MPPT unit with remote Wi-Fi monitoring. ETHOS storage in this listing is configurable from 10.24 to 30.72 kWh, and per BigBattery the battery and inverter operate with closed-loop communication.\u003c\/p\u003e\n\n\u003ch2\u003eWho This System Is For\u003c\/h2\u003e\n\u003cp\u003eHomeowners building a grid-interactive storage system around the newer FlexBOSS ecosystem — solar self-consumption, time-of-use offset, and outage backup — with more output headroom than the 18kPV's 12 kW and a direct path to GridBOSS whole-home management. The stackable ETHOS tower suits buyers who want to start with essential-circuit storage and add 5.12 kWh modules as needs grow.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e13 kW continuous output\u003c\/strong\u003e with PV contribution and \u003cstrong\u003e10 kW battery-only output\u003c\/strong\u003e, per EG4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUp to 18 kW of solar input utilization\u003c\/strong\u003e, per EG4, across 3 MPPTs per BigBattery's FlexBOSS18 listing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSplit-phase 120\/240V output\u003c\/strong\u003e feeds standard North American panels, per BigBattery's listing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUL 3141 and UL 1741 listed inverter\u003c\/strong\u003e, per EG4; ETHOS battery carries UL9540, UL9540A, UL1973, and UN38.3, per BigBattery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClosed-loop communication\u003c\/strong\u003e between ETHOS and compatible EG4 inverters, per BigBattery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemote Wi-Fi monitoring\u003c\/strong\u003e, per BigBattery's FlexBOSS18 listing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExpandable:\u003c\/strong\u003e stack additional ETHOS modules — up to 16 parallel connections per control box, per BigBattery\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy BigBattery\u003c\/h2\u003e\n\u003cp\u003eBigBattery is a US-based energy storage company that has been building lithium battery systems since 2011 and, per BigBattery, is trusted by more than 50,000 Americans. BigBattery states its products are designed and engineered in Texas, includes free lifetime tech support with every product, and backs its batteries with a 12-Year Limited Warranty — described by BigBattery as \"the longest warranty in the battery industry.\" OffGrid Horizon is a family-owned authorized BigBattery partner.\u003c\/p\u003e\n\n\u003ch2\u003eWhat's In the Kit\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1 × EG4 FlexBOSS18 hybrid solar inverter\u003c\/li\u003e\n\u003cli\u003eBigBattery ETHOS 48V 5.12 kWh LiFePO4 modules — capacity for this listing is configurable from 10.24 to 30.72 kWh (2–6 modules)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003ePlease call (302) 496-3554 to confirm the module count and configuration that ships at the listed price.\u003c\/strong\u003e BigBattery lists ETHOS inverter connectors and battery-to-battery connectors as separate accessories, so also confirm cabling with your order. Solar panels, racking, and array wiring are sold separately. For whole-home load management, AC coupling, and generator support, ask about the \u003ca href=\"\/products\/eg4-gridboss-200a-mid-microgrid-interconnection-device\"\u003eEG4 GridBOSS MID\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBattery\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBigBattery ETHOS, stackable LiFePO4 — see the \u003ca href=\"\/products\/bigbattery-ethos-48v-stackable-lifepo4-battery-5-1-kwh-modules-ul1973-ul9540a\"\u003eETHOS battery system\u003c\/a\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModule capacity\u003c\/td\u003e\n\u003ctd\u003e5.12 kWh \/ 100Ah per module, 51.2V nominal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCapacity (this listing)\u003c\/td\u003e\n\u003ctd\u003eConfigurable 10.24–30.72 kWh — call to confirm configuration\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax continuous discharge\u003c\/td\u003e\n\u003ctd\u003e200A (2-module stack) \/ 250A (3+ modules), per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery communications\u003c\/td\u003e\n\u003ctd\u003eCAN bus \/ RS485; closed-loop with EG4, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery certifications\u003c\/td\u003e\n\u003ctd\u003eUL9540, UL9540A, UL1973, UN38.3, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCycle life\u003c\/td\u003e\n\u003ctd\u003e3,500–5,000 cycles (80% DoD, 0.5C), per BigBattery's spec sheet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery warranty\u003c\/td\u003e\n\u003ctd\u003eBigBattery 12-Year Limited Warranty\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInverter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEG4 FlexBOSS18 hybrid (model IV-13000-HYB-AW, per EG4)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAC output\u003c\/td\u003e\n\u003ctd\u003e13 kW continuous with PV; 10 kW battery-only, per EG4; split-phase 120\/240V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePV input\u003c\/td\u003e\n\u003ctd\u003eUp to 18 kW solar input utilization, per EG4; 3 MPPTs per BigBattery's listing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating modes\u003c\/td\u003e\n\u003ctd\u003eGrid-tied, off-grid, battery backup (grid export subject to utility approval)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMonitoring\u003c\/td\u003e\n\u003ctd\u003eRemote Wi-Fi monitoring, per BigBattery's listing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInverter certifications\u003c\/td\u003e\n\u003ctd\u003eUL 3141, UL 1741, per EG4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInverter warranty\u003c\/td\u003e\n\u003ctd\u003e10-year, per EG4 (registration required — see below)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eGrid-Tied, Off-Grid, or Backup?\u003c\/h2\u003e\n\u003cp\u003eThe FlexBOSS18 is a hybrid inverter: per BigBattery, ETHOS + FlexBOSS configurations are grid-tied UL9540 systems, and per EG4 the unit is UL 3141 \/ UL 1741 listed for grid interconnection. It supports solar self-consumption, backup during outages, and off-grid operation. Grid export requires an approved interconnection agreement with your utility. Whole-home backup is achievable with proper design and load management — coverage is load-dependent, and heavy simultaneous 240V loads should be reviewed against the 10 kW battery-only output figure for nighttime outages.\u003c\/p\u003e\n\n\u003ch2\u003eInstallation\u003c\/h2\u003e\n\u003cp\u003eAll AC and DC wiring — panel interconnection, grounding, bonding, and overcurrent protection — must be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and local amendments. Residential energy storage installations typically require a permit and inspection, and grid-tied operation requires an approved interconnection agreement with your utility before the system may export power. Your installer should verify conductor sizing, disconnects, and clearances against current NEC requirements for energy storage systems.\u003c\/p\u003e\n\n\u003ch2\u003eWarranty \u0026amp; Support\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eBattery — BigBattery 12-Year Limited Warranty.\u003c\/strong\u003e Per BigBattery: \"If any covered component within your battery fails due to a defect in materials or workmanship within the 12-year warranty period, we will repair or replace the battery at our cost.\" Included accessories carry a 1-year warranty per BigBattery, and BigBattery provides free lifetime tech support for all its products.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInverter — EG4 10-year warranty.\u003c\/strong\u003e Per EG4, the FlexBOSS18 carries a \"10-year Full Parts Replacement or Full Product Replacement Warranty from the date of original inverter purchase,\" and the warranty must be registered within the first year of purchase (or proof of purchase from an EG4 authorized distributor provided) to remain valid.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eReturns and warranty claims require an RMA.\u003c\/strong\u003e Contact us before shipping anything back — all returns must be authorized with a Return Merchandise Authorization first. OffGrid Horizon is a family-owned authorized BigBattery partner: call (302) 496-3554 and we will help open the claim and coordinate service.\u003c\/p\u003e\n\n\u003ch2\u003eShipping\u003c\/h2\u003e\n\u003cp\u003eThis kit ships as palletized LTL freight within the continental United States; curbside liftgate delivery is standard for residential addresses. ETHOS towers are heavy — 273 lb for a two-module stack per BigBattery — so plan for help on delivery day. Before signing the delivery receipt, count the pieces and inspect the packaging; note any damage or shortage on the receipt with the driver and contact us immediately so we can open a freight claim. Per BigBattery, standard domestic orders are projected to take 7–12 days to deliver.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eWhat exactly ships at the listed price?\u003c\/h3\u003e\n\u003cp\u003eThis listing covers the EG4 FlexBOSS18 inverter plus ETHOS battery storage configurable from 10.24 to 30.72 kWh. Call (302) 496-3554 before ordering and we will confirm the module count, included accessories, and configuration options for this SKU.\u003c\/p\u003e\n\u003ch3\u003eHow is the FlexBOSS18 different from the 18kPV?\u003c\/h3\u003e\n\u003cp\u003eBoth accept up to 18 kW of PV, per EG4. The FlexBOSS18 offers 13 kW continuous output with PV (versus 12 kW), carries the newer UL 3141 listing, and is designed around the GridBOSS ecosystem for whole-home load management and AC coupling.\u003c\/p\u003e\n\u003ch3\u003eFlexBOSS18 or FlexBOSS21?\u003c\/h3\u003e\n\u003cp\u003ePer EG4, the FlexBOSS21 steps up to 21 kW of usable PV input and up to 16 kW of AC output with solar contribution. If your array or simultaneous loads are larger, consider the FlexBOSS21 kit; otherwise the FlexBOSS18 covers most homes.\u003c\/p\u003e\n\u003ch3\u003eWill this back up my whole home?\u003c\/h3\u003e\n\u003cp\u003eCoverage is load-dependent. 13 kW continuous output (10 kW battery-only at night, per EG4) carries most household circuits; heavy simultaneous 240V loads should be reviewed during design, and GridBOSS smart-load control can help manage them.\u003c\/p\u003e\n\u003ch3\u003eCan I add more battery later?\u003c\/h3\u003e\n\u003cp\u003eYes — ETHOS stacks in 5.12 kWh steps, with up to 16 parallel connections per control box per BigBattery, so capacity can grow without replacing the inverter.\u003c\/p\u003e\n\u003ch3\u003eDoes it work without solar panels?\u003c\/h3\u003e\n\u003cp\u003eYes. The system operates as grid-charged battery backup, and you can add panels later — up to 18 kW of solar input utilization, per EG4.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003eWant help choosing between FlexBOSS models or sizing your battery? Call OffGrid Horizon at (302) 496-3554 — family-owned, authorized BigBattery partner.\u003c\/em\u003e\u003c\/p\u003e","brand":"BigBattery","offers":[{"title":"2 × ETHOS — 10.24 kWh","offer_id":49051015938203,"sku":"K0230","price":6055.0,"currency_code":"USD","in_stock":true},{"title":"3 × ETHOS — 15.36 kWh","offer_id":49051015970971,"sku":"K0231","price":7315.0,"currency_code":"USD","in_stock":true},{"title":"4 × ETHOS — 20.48 kWh","offer_id":49051016003739,"sku":"K0232","price":8790.0,"currency_code":"USD","in_stock":true},{"title":"6 × ETHOS — 30.72 kWh","offer_id":49051016036507,"sku":"K0233","price":11290.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0746\/0614\/9787\/files\/203-2.png?v=1784676118"},{"product_id":"bigbattery-ethos-eg4-flexboss21-kit-10-24-30-72-kwh-split-phase-home-ess","title":"BigBattery ETHOS + EG4 FlexBOSS21 Kit | 10.24–30.72 kWh | Split-Phase Home ESS","description":"\u003cp\u003eThis kit pairs BigBattery's stackable ETHOS 48V LiFePO4 battery platform with the \u003ca href=\"\/products\/eg4-flexboss21-hybrid-solar-inverter-21-kw-pv-16-kw-ac-split-phase-4-mppt\"\u003eEG4 FlexBOSS21 hybrid inverter\u003c\/a\u003e. Per EG4, the FlexBOSS21 offers 21 kW of usable PV input across three MPPTs, delivers 12 kW of AC power from battery during non-sunlight conditions and up to the full 16 kW of AC output with solar PV contribution, and is UL 3141 \/ UL 1741 listed. Per BigBattery's kit page, the base configuration pairs one FlexBOSS21 with two ETHOS modules (10.24 kWh), and this listing supports storage up to 30.72 kWh with closed-loop communication between battery and inverter.\u003c\/p\u003e\n\n\u003ch2\u003eWho This System Is For\u003c\/h2\u003e\n\u003cp\u003eLarger homes and heavier simultaneous loads: central air, well pump, range, and shop tools at the same time. The FlexBOSS21 is the output and PV-capacity step up from the FlexBOSS18, and per EG4 it accepts up to 5 strings at up to 3 orientations — useful for complex roofs. The stackable ETHOS tower lets you start at 10.24 kWh and grow in 5.12 kWh steps as your storage needs increase.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e21 kW of usable PV (DC) input\u003c\/strong\u003e, per EG4, across three MPPTs (26A\/26A\/15A) supporting up to 5 strings and up to 3 orientations\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e12 kW AC from battery at night; up to 16 kW AC with solar PV contribution\u003c\/strong\u003e, per EG4 — split-phase 120\/240V\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e90A utility feed-through\u003c\/strong\u003e capability, per EG4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUL 3141 and UL 1741 listed inverter\u003c\/strong\u003e, per EG4; ETHOS battery carries UL9540, UL9540A, UL1973, and UN38.3, per BigBattery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClosed-loop communication\u003c\/strong\u003e between ETHOS and the inverter, per BigBattery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGridBOSS-ready:\u003c\/strong\u003e per EG4, pairing with GridBOSS adds AC coupling, smart loads, and generator support\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExpandable:\u003c\/strong\u003e per BigBattery's kit page, a single FlexBOSS21 supports up to nine ETHOS modules (46.1 kWh) — this listing covers up to 30.72 kWh; call for larger configurations\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy BigBattery\u003c\/h2\u003e\n\u003cp\u003eBigBattery is a US-based energy storage company that has been building lithium battery systems since 2011 and, per BigBattery, is trusted by more than 50,000 Americans. BigBattery states its products are designed and engineered in Texas, includes free lifetime tech support with every product, and backs its batteries with a 12-Year Limited Warranty — described by BigBattery as \"the longest warranty in the battery industry.\" OffGrid Horizon is a family-owned authorized BigBattery partner.\u003c\/p\u003e\n\n\u003ch2\u003eWhat's In the Kit\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1 × EG4 FlexBOSS21 hybrid solar inverter\u003c\/li\u003e\n\u003cli\u003e2 × BigBattery ETHOS 48V 5.12 kWh LiFePO4 modules — 10.24 kWh base configuration, per BigBattery's kit page for this SKU family\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eStorage is expandable to 30.72 kWh within this listing (and to 46.1 kWh on one inverter, per BigBattery) — \u003cstrong\u003ecall (302) 496-3554 to confirm your configuration before ordering.\u003c\/strong\u003e BigBattery lists ETHOS inverter connectors and battery-to-battery connectors as separate accessories, so confirm cabling with your order. Solar panels, racking, and array wiring are sold separately. For whole-home management, ask about the \u003ca href=\"\/products\/eg4-gridboss-200a-mid-microgrid-interconnection-device\"\u003eEG4 GridBOSS MID\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBattery\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBigBattery ETHOS, stackable LiFePO4 — see the \u003ca href=\"\/products\/bigbattery-ethos-48v-stackable-lifepo4-battery-5-1-kwh-modules-ul1973-ul9540a\"\u003eETHOS battery system\u003c\/a\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModule capacity\u003c\/td\u003e\n\u003ctd\u003e5.12 kWh \/ 100Ah per module, 51.2V nominal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBase capacity (this listing)\u003c\/td\u003e\n\u003ctd\u003e10.24 kWh (2 modules); expandable to 30.72 kWh\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax continuous discharge\u003c\/td\u003e\n\u003ctd\u003e200A (2-module stack) \/ 250A (3+ modules), per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery communications\u003c\/td\u003e\n\u003ctd\u003eCAN bus \/ RS485; closed-loop with EG4, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery certifications\u003c\/td\u003e\n\u003ctd\u003eUL9540, UL9540A, UL1973, UN38.3, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCycle life\u003c\/td\u003e\n\u003ctd\u003e3,500–5,000 cycles (80% DoD, 0.5C), per BigBattery's spec sheet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery warranty\u003c\/td\u003e\n\u003ctd\u003eBigBattery 12-Year Limited Warranty\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInverter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEG4 FlexBOSS21 hybrid (per EG4)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePV input\u003c\/td\u003e\n\u003ctd\u003e21 kW usable; 3 MPPTs (26A\/26A\/15A); up to 5 strings, 3 orientations\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAC output\u003c\/td\u003e\n\u003ctd\u003e12 kW from battery; up to 16 kW with PV contribution; split-phase 120\/240V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGrid feed-through\u003c\/td\u003e\n\u003ctd\u003e90A utility feed-through, per EG4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating modes\u003c\/td\u003e\n\u003ctd\u003eGrid-tied, hybrid, off-grid (grid export subject to utility approval)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInverter certifications\u003c\/td\u003e\n\u003ctd\u003eUL 3141, UL 1741, per EG4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInverter warranty\u003c\/td\u003e\n\u003ctd\u003e10-year, per EG4 and BigBattery (registration required — see below)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eGrid-Tied, Off-Grid, or Backup?\u003c\/h2\u003e\n\u003cp\u003ePer BigBattery, ETHOS + FlexBOSS21 configurations support grid-tied, hybrid, and off-grid installations, and grid-tied ETHOS\/FlexBOSS systems are UL9540 configurations. Grid export requires an approved interconnection agreement with your utility. For backup, note the two output figures per EG4: up to 16 kW of AC with solar contribution during the day, and 12 kW from battery alone at night — whole-home backup is realistic for many homes with proper design, but coverage is load-dependent and should be confirmed against your panel schedule.\u003c\/p\u003e\n\n\u003ch2\u003eInstallation\u003c\/h2\u003e\n\u003cp\u003eAll AC and DC wiring — panel interconnection, grounding, bonding, and overcurrent protection — must be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and local amendments. Residential energy storage installations typically require a permit and inspection, and grid-tied operation requires an approved interconnection agreement with your utility before the system may export power. Your installer should verify conductor sizing, disconnects, and clearances against current NEC requirements for energy storage systems.\u003c\/p\u003e\n\n\u003ch2\u003eWarranty \u0026amp; Support\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eBattery — BigBattery 12-Year Limited Warranty.\u003c\/strong\u003e Per BigBattery: \"If any covered component within your battery fails due to a defect in materials or workmanship within the 12-year warranty period, we will repair or replace the battery at our cost.\" Included accessories carry a 1-year warranty per BigBattery, and BigBattery provides free lifetime tech support for all its products.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInverter — 10-year warranty, per EG4 and BigBattery.\u003c\/strong\u003e Per EG4, inverter warranties must be registered within the first year of purchase (or proof of purchase from an EG4 authorized distributor provided) to remain valid.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eReturns and warranty claims require an RMA.\u003c\/strong\u003e Contact us before shipping anything back — all returns must be authorized with a Return Merchandise Authorization first. OffGrid Horizon is a family-owned authorized BigBattery partner: call (302) 496-3554 and we will help open the claim and coordinate service.\u003c\/p\u003e\n\n\u003ch2\u003eShipping\u003c\/h2\u003e\n\u003cp\u003eThis kit ships as palletized LTL freight within the continental United States; curbside liftgate delivery is standard for residential addresses. The two-module ETHOS tower weighs 273 lb per BigBattery, plus the inverter pallet — plan for help on delivery day. Before signing the delivery receipt, count the pieces and inspect the packaging; note any damage or shortage on the receipt with the driver and contact us immediately so we can open a freight claim. Per BigBattery, standard domestic orders are projected to take 7–12 days to deliver.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eWhat exactly ships at the listed price?\u003c\/h3\u003e\n\u003cp\u003eThe base configuration per BigBattery's kit page: one FlexBOSS21 inverter and two ETHOS modules (10.24 kWh). Call (302) 496-3554 to confirm included accessories or to configure a larger battery bank.\u003c\/p\u003e\n\u003ch3\u003eWhy do I see both 12 kW and 16 kW output figures?\u003c\/h3\u003e\n\u003cp\u003ePer EG4: the FlexBOSS21 delivers 12 kW of AC power from battery during non-sunlight conditions and reaches the full 16 kW of AC output with solar PV contribution during the day.\u003c\/p\u003e\n\u003ch3\u003eHow many solar strings can I connect?\u003c\/h3\u003e\n\u003cp\u003ePer EG4, three MPPTs configured 26A\/26A\/15A allow up to 5 strings, panels up to 13A, at up to 3 orientations — good flexibility for complex roofs.\u003c\/p\u003e\n\u003ch3\u003eWill this back up my whole home?\u003c\/h3\u003e\n\u003cp\u003eWith 16 kW available during solar hours and 12 kW from battery, many homes can approach whole-home coverage — but it is load-dependent. GridBOSS adds smart-load and generator management to shed or shift heavy loads.\u003c\/p\u003e\n\u003ch3\u003eCan I add more battery later?\u003c\/h3\u003e\n\u003cp\u003eYes. ETHOS stacks in 5.12 kWh steps; per BigBattery a single FlexBOSS21 supports up to nine modules (46.1 kWh), and multi-inverter configurations go larger still — call us for options.\u003c\/p\u003e\n\u003ch3\u003eDoes it export to the grid?\u003c\/h3\u003e\n\u003cp\u003eGrid-tied operation with export is supported in UL9540 configurations per BigBattery, subject to your utility's interconnection approval.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003eDeciding between FlexBOSS18 and FlexBOSS21, or sizing a larger bank? Call OffGrid Horizon at (302) 496-3554 — family-owned, authorized BigBattery partner.\u003c\/em\u003e\u003c\/p\u003e","brand":"BigBattery","offers":[{"title":"2 × ETHOS — 10.24 kWh","offer_id":49051018002587,"sku":"K0241","price":6460.0,"currency_code":"USD","in_stock":true},{"title":"3 × ETHOS — 15.36 kWh","offer_id":49051018035355,"sku":"K0242","price":7720.0,"currency_code":"USD","in_stock":true},{"title":"4 × ETHOS — 20.48 kWh","offer_id":49051018068123,"sku":"K0243","price":9195.0,"currency_code":"USD","in_stock":true},{"title":"6 × ETHOS — 30.72 kWh","offer_id":49051018100891,"sku":"K0244","price":11695.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0746\/0614\/9787\/files\/214-3.png?v=1784676141"},{"product_id":"bigbattery-nexus-apex-6-5k-off-grid-kit-30-45-kwh-48v-lifepo4","title":"BigBattery NEXUS + APEX 6.5K Off-Grid Kit | 30–45 kWh | 48V LiFePO4","description":"\u003cp\u003eThis is the multi-battery configuration of the NEXUS + APEX 6.5K system: two or three BigBattery NEXUS 48V LiFePO4 batteries — 280Ah and 14.3 kWh usable each, per BigBattery — with the APEX 6.5K all-in-one inverter: 6,500W of continuous split-phase 120\/240V output, two MPPT solar inputs rated 5,000W + 5,000W, and built-in charging from grid or generator, per BigBattery. BigBattery sells this as an off-grid and backup power system; it is not sold as a grid-interactive (sell-back) system.\u003c\/p\u003e\n\n\u003ch2\u003eWho This Is For\u003c\/h2\u003e\n\u003cp\u003eCabins, homesteads, and off-grid households whose loads are moderate but constant — refrigeration, lighting, pumps, electronics, and everyday 240V appliances — and who draw on the bank every day or face long overcast stretches. The 6,500W inverter covers the loads; 30–45 kWh class storage covers the nights and the weather. If peak power is your constraint instead, see the APEX 10K version of this kit.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eChoose 2 × NEXUS (30 kWh class) or 3 × NEXUS (45 kWh class)\u003c\/strong\u003e — 28.6 or 42.9 kWh usable, adding BigBattery's 14.3 kWh per-unit figure\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e6,500W continuous split-phase 120\/240V output\u003c\/strong\u003e, 13,000VA maximum output, per BigBattery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwo MPPT solar inputs, 5,000W + 5,000W\u003c\/strong\u003e (125–450Vdc MPPT range), per BigBattery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwo AC inputs (grid and generator)\u003c\/strong\u003e — up to 80A grid\/generator charging and up to 140A solar charging, per BigBattery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNEXUS batteries: 6,000+ cycle life\u003c\/strong\u003e, self-heating function, aerosol fire suppression, RS485 \/ RJ45 \/ CAN communications, per BigBattery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRoom to grow:\u003c\/strong\u003e NEXUS parallels up to 15 units and the APEX 6.5K parallels up to 6 units, per BigBattery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInverter certifications:\u003c\/strong\u003e UL1741 \/ RoHS \/ EN61000-6-1 \/ EC61000-6-3 \/ FCC Part 15 Class B, per BigBattery\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy BigBattery\u003c\/h2\u003e\n\u003cp\u003eBigBattery is a US company building LiFePO4 energy storage for off-grid and home backup use; the APEX line is BigBattery's own inverter family, so battery and inverter come from one manufacturer. Kits ship from Texas and are backed by lifetime USA-based technical support, per BigBattery. See our full \u003ca href=\"\/collections\/bigbattery\"\u003eBigBattery collection\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eWhat's In the Kit\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e2 or 3 × \u003ca href=\"\/products\/bigbattery-nexus-48v-lifepo4-battery-15-kwh\"\u003eBigBattery NEXUS 48V LiFePO4 battery\u003c\/a\u003e — select from the Battery Configuration menu; the price shown is for the configuration selected\u003c\/li\u003e\n\u003cli\u003e1 × \u003ca href=\"\/products\/apex-6-5k-off-grid-inverter-6-5-kw-48v-split-phase\"\u003eAPEX 6.5K off-grid inverter\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eSolar panels, racking, and array wiring are not included. BigBattery's kit listing does not itemize cables or accessories, so call us at (302) 496-3554 before ordering and we'll confirm exactly what ships with your configuration.\u003c\/p\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBatteries\u003c\/td\u003e\n\u003ctd\u003e2 or 3 × BigBattery NEXUS, 48V class (51.2V nominal), LiFePO4, 280Ah each\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUsable energy\u003c\/td\u003e\n\u003ctd\u003e14.3 kWh per battery, per BigBattery — 28.6 kWh (2 units) or 42.9 kWh (3 units) total\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery max continuous discharge\u003c\/td\u003e\n\u003ctd\u003e140A (7.6 kW) per battery, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery cycle life\u003c\/td\u003e\n\u003ctd\u003e6,000+ cycles, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery communications\u003c\/td\u003e\n\u003ctd\u003eRS485 \/ RJ45 \/ CAN\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery dimensions \/ weight\u003c\/td\u003e\n\u003ctd\u003e19.7 × 27.5 × 15.7 in; approx. 315 lb — each\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInverter\u003c\/td\u003e\n\u003ctd\u003eAPEX 6.5K — 6,500W rated output, 13,000VA maximum, split-phase 120\/240Vac\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSolar input\u003c\/td\u003e\n\u003ctd\u003eTwo MPPTs, 5,000W + 5,000W; 125–450Vdc MPPT range; 18A + 18A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCharging\u003c\/td\u003e\n\u003ctd\u003eUp to 140A from solar; up to 80A from grid\/generator; two AC inputs (grid \u0026amp; generator)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInverter parallel capability\u003c\/td\u003e\n\u003ctd\u003eUp to 6 units, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInverter certifications\u003c\/td\u003e\n\u003ctd\u003eUL1741 \/ RoHS \/ EN61000-6-1 \/ EC61000-6-3 \/ FCC Part 15 Class B, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInverter dimensions \/ weight\u003c\/td\u003e\n\u003ctd\u003e25.51 × 16.14 × 5.51 in; 48 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery warranty\u003c\/td\u003e\n\u003ctd\u003e12-Year Limited Warranty, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInverter warranty\u003c\/td\u003e\n\u003ctd\u003e5-Year Limited Warranty, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eKit SKU\u003c\/td\u003e\n\u003ctd\u003eK0192 (2 batteries) \/ K0193 (3 batteries)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eSizing Your Off-Grid Home\u003c\/h2\u003e\n\u003cp\u003eExample assumptions for a lived-in homestead — label and adjust for your own site: refrigerator 1.5 kWh\/day, chest freezer 1.0, LED lighting 1.0, well pump 1.5, electronics and internet 1.5, laundry and kitchen 2.0. That is about 8.5 kWh\/day before climate loads; a mini-split commonly adds 5–15 kWh\/day in season depending on size and climate, bringing many households to 14–20 kWh\/day.\u003c\/p\u003e\n\u003cp\u003eAgainst that: two NEXUS (28.6 kWh usable, per BigBattery's per-unit figure) is a full day and a half to two days of autonomy; three (42.9 kWh) stretches toward three days — the difference you feel in a cloudy week. On power, two batteries support about 280A \/ 15.2 kW continuous by simple addition of BigBattery's per-unit figures, so the bank carries the 6,500W inverter with headroom to spare.\u003c\/p\u003e\n\n\u003ch2\u003eInstallation\u003c\/h2\u003e\n\u003cp\u003eEach battery cabinet weighs approximately 315 lb, so plan floor space and the move for two or three of them, plus wall space for the 48 lb inverter. The AC side — panel interconnection, overcurrent protection, grounding, bonding — belongs to a licensed electrician working to the National Electrical Code (NEC) and local codes; most jurisdictions require a permit and inspection for energy storage. Keep the batteries in a dry space above freezing; BigBattery's published charge range starts at 32°F.\u003c\/p\u003e\n\n\u003ch2\u003eWarranty \u0026amp; Support\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eBatteries:\u003c\/strong\u003e covered by BigBattery's 12-Year Limited Warranty — in BigBattery's words, “BigBattery, Inc. guarantees that its products will be free from defects in material and workmanship for a period of twelve (12) years.” Included accessories are covered for 1 year, and no registration is needed, per BigBattery. \u003cstrong\u003eInverter:\u003c\/strong\u003e the APEX 6.5K is covered by a 5-Year Limited Warranty, per BigBattery.\u003c\/p\u003e\n\u003cp\u003eBigBattery publishes a 30-Day Money Back Guarantee; per BigBattery, non-defective returns are refunded at purchase price minus a 20% restocking fee, excluding shipping. All returns require a Return Merchandise Authorization (RMA) before anything ships back — call OffGrid Horizon at (302) 496-3554 and we'll open the RMA or warranty claim with BigBattery. We're a family-owned authorized BigBattery partner, and BigBattery backs the system with lifetime USA-based technical support.\u003c\/p\u003e\n\n\u003ch2\u003eShipping\u003c\/h2\u003e\n\u003cp\u003eThis kit ships as palletized freight within the United States — two or three battery cabinets plus the inverter. Inspect every pallet before signing: note any damage on the delivery receipt and contact us promptly — that notation keeps a freight claim simple.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eWhat exactly does the listed price include?\u003c\/h3\u003e\n\u003cp\u003eThe Battery Configuration you select — two or three NEXUS batteries — plus one APEX 6.5K inverter. The price updates with your selection. Panels and racking are separate.\u003c\/p\u003e\n\u003ch3\u003eTwo batteries or three?\u003c\/h3\u003e\n\u003cp\u003eMatch storage to your daily consumption and the cloudy stretch you want to ride out. Households near 14–18 kWh\/day usually do well at 28.6 kWh usable; heavier consumption or multi-day weather points to three units. And the bank grows later — up to 15 in parallel, per BigBattery.\u003c\/p\u003e\n\u003ch3\u003eIs this a grid-tie system?\u003c\/h3\u003e\n\u003cp\u003eNo. BigBattery sells it for off-grid and backup power applications; the two AC inputs accept grid or generator power for charging, per BigBattery.\u003c\/p\u003e\n\u003ch3\u003eIs 6,500W enough with this much storage?\u003c\/h3\u003e\n\u003cp\u003eStorage and power are separate questions. If your simultaneous loads stay under roughly 6,500W — typical for cabins and efficient homesteads — this inverter is the right size, and the deep bank is what carries the nights. For bigger simultaneous loads, the APEX 10K version pairs the same batteries with more output.\u003c\/p\u003e\n\u003ch3\u003eDo I need an electrician?\u003c\/h3\u003e\n\u003cp\u003eYes — AC interconnection, grounding, and code compliance are work for a licensed electrician, and most jurisdictions require a permit and inspection.\u003c\/p\u003e\n\u003ch3\u003eHow do the batteries handle cold weather?\u003c\/h3\u003e\n\u003cp\u003ePer BigBattery, the NEXUS discharges from −4°F to 113°F and charges from 32°F to 113°F, with a self-heating function. Keep the cabinets in a space that stays above freezing.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003eTwo batteries or three — want a second opinion on your load list? Call OffGrid Horizon at (302) 496-3554. Family-owned, authorized BigBattery partner.\u003c\/em\u003e\u003c\/p\u003e","brand":"BigBattery","offers":[{"title":"2 × NEXUS — 30 kWh","offer_id":49051018789019,"sku":"K0192","price":7680.0,"currency_code":"USD","in_stock":true},{"title":"3 × NEXUS — 45 kWh","offer_id":49051018821787,"sku":"K0193","price":10725.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0746\/0614\/9787\/files\/Nexus-Apex-6.5K-Default-scaled.png?v=1784676164"},{"product_id":"bigbattery-nexus-apex-10k-off-grid-kit-30-45-kwh-48v-lifepo4","title":"BigBattery NEXUS + APEX 10K Off-Grid Kit | 30–45 kWh | 48V LiFePO4","description":"\u003cp\u003eThis is the full-output configuration of the NEXUS + APEX line: two or three BigBattery NEXUS 48V LiFePO4 batteries — 280Ah and 14.3 kWh usable each, per BigBattery — with the APEX 10K all-in-one inverter: 10,000W of continuous split-phase 120\/240V output, 20,000VA maximum, two MPPT solar inputs rated 5,000W + 5,500W, and built-in charging from grid or generator, per BigBattery. With two or more batteries, the bank supports the inverter's full continuous rating — each NEXUS contributes 140A (about 7.6 kW) per BigBattery. BigBattery sells this as an off-grid and backup power system; it is not sold as a grid-interactive (sell-back) system.\u003c\/p\u003e\n\n\u003ch2\u003eWho This Is For\u003c\/h2\u003e\n\u003cp\u003eFull-size off-grid homes and working properties that run heavy simultaneous loads — well pump, HVAC, kitchen, and shop equipment together — and cycle the bank daily. The 10K inverter provides the headroom; 30–45 kWh class storage carries the nights and cloudy weather. If your loads are cabin-scale, the APEX 6.5K version keeps the same battery platform with a smaller inverter.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eChoose 2 × NEXUS (30 kWh class) or 3 × NEXUS (45 kWh class)\u003c\/strong\u003e — 28.6 or 42.9 kWh usable, adding BigBattery's 14.3 kWh per-unit figure\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e10,000W continuous split-phase 120\/240V output\u003c\/strong\u003e, 20,000VA maximum output, per BigBattery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwo MPPT solar inputs, 5,000W + 5,500W\u003c\/strong\u003e (125–450Vdc MPPT range, 550Vdc max open-circuit), per BigBattery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUp to 200A solar charging, up to 120A grid\/generator charging\u003c\/strong\u003e; one AC input (grid or generator); UPS backup capability (15–30ms), per BigBattery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNEXUS batteries: 6,000+ cycle life\u003c\/strong\u003e, self-heating function, aerosol fire suppression, RS485 \/ RJ45 \/ CAN communications, per BigBattery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRoom to grow:\u003c\/strong\u003e NEXUS parallels up to 15 units and the APEX 10K parallels up to 6 units, per BigBattery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInverter certifications:\u003c\/strong\u003e UL1741 \/ RoHS \/ EN61000-6-1 \/ EC61000-6-3 \/ FCC Part 15 Class B \/ IEC62109-1 \/ IEC62109-2, per BigBattery\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy BigBattery\u003c\/h2\u003e\n\u003cp\u003eBigBattery is a US company building LiFePO4 energy storage for off-grid and home backup use; the APEX line is BigBattery's own inverter family, so battery and inverter come from one manufacturer. Kits ship from Texas and are backed by lifetime USA-based technical support, per BigBattery. See our full \u003ca href=\"\/collections\/bigbattery\"\u003eBigBattery collection\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eWhat's In the Kit\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e2 or 3 × \u003ca href=\"\/products\/bigbattery-nexus-48v-lifepo4-battery-15-kwh\"\u003eBigBattery NEXUS 48V LiFePO4 battery\u003c\/a\u003e — select from the Battery Configuration menu; the price shown is for the configuration selected\u003c\/li\u003e\n\u003cli\u003e1 × \u003ca href=\"\/products\/apex-10k-off-grid-inverter-10-kw-48v-split-phase\"\u003eAPEX 10K off-grid inverter\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eSolar panels, racking, and array wiring are not included. BigBattery's kit listing does not itemize cables or accessories, so call us at (302) 496-3554 before ordering and we'll confirm exactly what ships with your configuration.\u003c\/p\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBatteries\u003c\/td\u003e\n\u003ctd\u003e2 or 3 × BigBattery NEXUS, 48V class (51.2V nominal), LiFePO4, 280Ah each\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUsable energy\u003c\/td\u003e\n\u003ctd\u003e14.3 kWh per battery, per BigBattery — 28.6 kWh (2 units) or 42.9 kWh (3 units) total\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery max continuous discharge\u003c\/td\u003e\n\u003ctd\u003e140A (7.6 kW) per battery, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery cycle life\u003c\/td\u003e\n\u003ctd\u003e6,000+ cycles, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery communications\u003c\/td\u003e\n\u003ctd\u003eRS485 \/ RJ45 \/ CAN\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery dimensions \/ weight\u003c\/td\u003e\n\u003ctd\u003e19.7 × 27.5 × 15.7 in; approx. 315 lb — each\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInverter\u003c\/td\u003e\n\u003ctd\u003eAPEX 10K — 10,000W rated output, 20,000VA maximum, split-phase 120\/240Vac\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSolar input\u003c\/td\u003e\n\u003ctd\u003eTwo MPPTs, 5,000W + 5,500W; 125–450Vdc MPPT range; 22A + 22A; 550Vdc max open-circuit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCharging\u003c\/td\u003e\n\u003ctd\u003eUp to 200A from solar; up to 120A from grid\/generator; one AC input (grid or generator)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInverter parallel capability\u003c\/td\u003e\n\u003ctd\u003eUp to 6 units, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInverter certifications\u003c\/td\u003e\n\u003ctd\u003eUL1741 \/ RoHS \/ EN61000-6-1 \/ EC61000-6-3 \/ FCC Part 15 Class B \/ IEC62109-1 \/ IEC62109-2, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInverter dimensions \/ weight\u003c\/td\u003e\n\u003ctd\u003e28.46 × 17.64 × 5.91 in; 62 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery warranty\u003c\/td\u003e\n\u003ctd\u003e12-Year Limited Warranty, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInverter warranty\u003c\/td\u003e\n\u003ctd\u003e5-Year Limited Warranty, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eKit SKU\u003c\/td\u003e\n\u003ctd\u003eK0197 (2 batteries) \/ K0198 (3 batteries)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eSizing Your Off-Grid Home\u003c\/h2\u003e\n\u003cp\u003eExample assumptions for a full-size off-grid home — label and adjust for your own site: refrigerator 1.5 kWh\/day, freezer 1.0, lighting 1.0, well pump 1.5, electronics 1.5, laundry and kitchen 3.0, plus air conditioning at roughly 8–15 kWh\/day in season depending on tonnage and climate. Call it 17–25 kWh\/day in the demanding months.\u003c\/p\u003e\n\u003cp\u003eTwo NEXUS (28.6 kWh usable, per BigBattery's per-unit figure) covers about a day of that with margin; three (42.9 kWh) buys the second day that gets you through weather without running a generator. On power, two batteries support about 280A \/ 15.2 kW continuous by simple addition of BigBattery's per-unit figures — comfortably above the inverter's 10,000W rating — and three add margin for surge-heavy loads.\u003c\/p\u003e\n\n\u003ch2\u003eInstallation\u003c\/h2\u003e\n\u003cp\u003eEach battery cabinet weighs approximately 315 lb, so plan floor space and the move for two or three of them, plus wall space for the 62 lb inverter. The AC side — panel interconnection, overcurrent protection, grounding, bonding — belongs to a licensed electrician working to the National Electrical Code (NEC) and local codes; most jurisdictions require a permit and inspection for energy storage. Keep the batteries in a dry space above freezing; BigBattery's published charge range starts at 32°F.\u003c\/p\u003e\n\n\u003ch2\u003eWarranty \u0026amp; Support\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eBatteries:\u003c\/strong\u003e covered by BigBattery's 12-Year Limited Warranty — in BigBattery's words, “BigBattery, Inc. guarantees that its products will be free from defects in material and workmanship for a period of twelve (12) years.” Included accessories are covered for 1 year, and no registration is needed, per BigBattery. \u003cstrong\u003eInverter:\u003c\/strong\u003e the APEX 10K is covered by a 5-Year Limited Warranty, per BigBattery.\u003c\/p\u003e\n\u003cp\u003eBigBattery publishes a 30-Day Money Back Guarantee; per BigBattery, non-defective returns are refunded at purchase price minus a 20% restocking fee, excluding shipping. All returns require a Return Merchandise Authorization (RMA) before anything ships back — call OffGrid Horizon at (302) 496-3554 and we'll open the RMA or warranty claim with BigBattery. We're a family-owned authorized BigBattery partner, and BigBattery backs the system with lifetime USA-based technical support.\u003c\/p\u003e\n\n\u003ch2\u003eShipping\u003c\/h2\u003e\n\u003cp\u003eThis kit ships as palletized freight within the United States — two or three battery cabinets plus the inverter. Inspect every pallet before signing: note any damage on the delivery receipt and contact us promptly — that notation keeps a freight claim simple.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eWhat exactly does the listed price include?\u003c\/h3\u003e\n\u003cp\u003eThe Battery Configuration you select — two or three NEXUS batteries — plus one APEX 10K inverter. The price updates with your selection. Panels and racking are separate.\u003c\/p\u003e\n\u003ch3\u003eCan the bank actually feed 10,000W continuously?\u003c\/h3\u003e\n\u003cp\u003eYes, with two or more batteries: each NEXUS supports 140A (about 7.6 kW) continuous per BigBattery, so two units support roughly 15.2 kW by simple addition — above the inverter's full rating.\u003c\/p\u003e\n\u003ch3\u003eTwo batteries or three?\u003c\/h3\u003e\n\u003cp\u003eSize to daily consumption and the weather you ride out. Homes near 17–20 kWh\/day usually run well at 28.6 kWh usable; heavier use or multi-day cloud points to three. The bank can also grow later — up to 15 in parallel, per BigBattery.\u003c\/p\u003e\n\u003ch3\u003eIs this a grid-tie system?\u003c\/h3\u003e\n\u003cp\u003eNo. BigBattery sells it for off-grid and backup power applications; the AC input accepts grid or generator power for charging, per BigBattery.\u003c\/p\u003e\n\u003ch3\u003eWill it start large motors?\u003c\/h3\u003e\n\u003cp\u003eBigBattery rates the APEX 10K at 20,000VA maximum output for short-duration demands above its 10,000W continuous rating. Bring us the nameplate figures on your well pump or compressor and we'll confirm the load picture.\u003c\/p\u003e\n\u003ch3\u003eDo I need an electrician?\u003c\/h3\u003e\n\u003cp\u003eYes — AC interconnection, grounding, and code compliance are work for a licensed electrician, and most jurisdictions require a permit and inspection.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003eRunning the numbers on a whole-home system? Call OffGrid Horizon at (302) 496-3554 — family-owned, authorized BigBattery partner, straight answers.\u003c\/em\u003e\u003c\/p\u003e","brand":"BigBattery","offers":[{"title":"2 × NEXUS — 30 kWh","offer_id":49051020034203,"sku":"K0197","price":7870.0,"currency_code":"USD","in_stock":true},{"title":"3 × NEXUS — 45 kWh","offer_id":49051020066971,"sku":"K0198","price":10915.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0746\/0614\/9787\/files\/Nexus-Apex-10K-scaled.png?v=1784676189"},{"product_id":"bigbattery-nexus-eg4-6000xp-off-grid-kit-30-45-kwh-48v-lifepo4","title":"BigBattery NEXUS + EG4 6000XP Off-Grid Kit | 30–45 kWh | 48V LiFePO4","description":"\u003cp\u003eThis is the multi-battery configuration of the NEXUS + EG4 6000XP system: two or three BigBattery NEXUS 48V LiFePO4 batteries — 280Ah and 14.3 kWh usable each, per BigBattery — with the EG4 6000XP all-in-one off-grid inverter: 6,000W of continuous split-phase 120\/240V output and dual MPPTs accepting up to 8,000W of PV, per EG4. It is built for multi-day autonomy rather than short outages — homesteads and off-grid households that live off the bank every day. Per BigBattery, the NEXUS is compatible with all EG4 inverters over RS485 \/ RJ45 \/ CAN communications.\u003c\/p\u003e\n\n\u003ch2\u003eWho This Is For\u003c\/h2\u003e\n\u003cp\u003eCabins and homesteads with moderate loads — refrigeration, lighting, a water pump, electronics, and everyday 240V appliances — that cycle the bank daily and want to ride out nights and cloudy stretches without a generator. If you run central air or a well pump plus large appliances simultaneously, the EG4 12000XP V2 version doubles the inverter output on the same battery platform.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eChoose 2 × NEXUS (30 kWh class) or 3 × NEXUS (45 kWh class)\u003c\/strong\u003e — 28.6 or 42.9 kWh usable, adding BigBattery's 14.3 kWh per-unit figure\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e6,000W continuous split-phase 120\/240V output\u003c\/strong\u003e, per EG4; surge rated 12,000W (3.5 seconds), per BigBattery's kit listing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUp to 8,000W of PV input\u003c\/strong\u003e — 4,000W per MPPT across dual MPPTs, with high 480Vdc input, per EG4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUL 1741 Certified\u003c\/strong\u003e transformerless design, idle as low as 30W with PV, per EG4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eParallels up to 16 inverters\u003c\/strong\u003e (96 kW combined), per EG4; batteries parallel up to 15 units, per BigBattery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNEXUS batteries: 6,000+ cycle life\u003c\/strong\u003e, self-heating function, aerosol fire suppression, per BigBattery\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy BigBattery\u003c\/h2\u003e\n\u003cp\u003eBigBattery is a US company building LiFePO4 energy storage for off-grid and home backup use. NEXUS batteries ship from Texas, carry a 12-Year Limited Warranty, and are backed by lifetime USA-based technical support, per BigBattery — here matched with EG4's widely installed 6000XP. Browse our \u003ca href=\"\/collections\/eg4\"\u003eEG4 collection\u003c\/a\u003e for the rest of the line.\u003c\/p\u003e\n\n\u003ch2\u003eWhat's In the Kit\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e2 or 3 × \u003ca href=\"\/products\/bigbattery-nexus-48v-lifepo4-battery-15-kwh\"\u003eBigBattery NEXUS 48V LiFePO4 battery\u003c\/a\u003e — select from the Battery Configuration menu; the price shown is for the configuration selected\u003c\/li\u003e\n\u003cli\u003e1 × \u003ca href=\"\/products\/eg4-6000xp-off-grid-inverter-6-kw-output-8-kw-pv-input-split-phase\"\u003eEG4 6000XP off-grid inverter\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eSolar panels, racking, and array wiring are not included. BigBattery's kit listing does not itemize cables or accessories, so call us at (302) 496-3554 before ordering and we'll confirm exactly what ships with your configuration.\u003c\/p\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBatteries\u003c\/td\u003e\n\u003ctd\u003e2 or 3 × BigBattery NEXUS, 48V class (51.2V nominal), LiFePO4, 280Ah each\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUsable energy\u003c\/td\u003e\n\u003ctd\u003e14.3 kWh per battery, per BigBattery — 28.6 kWh (2 units) or 42.9 kWh (3 units) total\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery max continuous discharge\u003c\/td\u003e\n\u003ctd\u003e140A (7.6 kW) per battery, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery cycle life\u003c\/td\u003e\n\u003ctd\u003e6,000+ cycles, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery communications\u003c\/td\u003e\n\u003ctd\u003eRS485 \/ RJ45 \/ CAN; compatible with all EG4 inverters, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery dimensions \/ weight\u003c\/td\u003e\n\u003ctd\u003e19.7 × 27.5 × 15.7 in; approx. 315 lb — each\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInverter\u003c\/td\u003e\n\u003ctd\u003eEG4 6000XP — 6,000W continuous, split-phase 120\/240V, per EG4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurge\u003c\/td\u003e\n\u003ctd\u003e12,000W (3.5 s), per BigBattery's kit listing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSolar input\u003c\/td\u003e\n\u003ctd\u003eUp to 8,000W (4,000W per MPPT), dual MPPTs, high 480Vdc input, per EG4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInverter parallel capability\u003c\/td\u003e\n\u003ctd\u003eUp to 16 units (96 kW combined), per EG4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInverter certifications\u003c\/td\u003e\n\u003ctd\u003eUL 1741 Certified, per EG4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery warranty\u003c\/td\u003e\n\u003ctd\u003e12-Year Limited Warranty, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInverter warranty\u003c\/td\u003e\n\u003ctd\u003e5-year full parts replacement or full product replacement warranty, per EG4 (registration or authorized-distributor proof of purchase required — see below)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eKit SKU\u003c\/td\u003e\n\u003ctd\u003eK0153 (2 batteries) \/ K0157 (3 batteries)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eSizing Your Off-Grid Home\u003c\/h2\u003e\n\u003cp\u003eExample assumptions for a lived-in homestead — label and adjust for your own site: refrigerator 1.5 kWh\/day, chest freezer 1.0, LED lighting 1.0, well pump 1.5, electronics and internet 1.5, laundry and kitchen 2.0. That is about 8.5 kWh\/day before climate loads; a mini-split commonly adds 5–15 kWh\/day in season, bringing many households to 14–20 kWh\/day.\u003c\/p\u003e\n\u003cp\u003eTwo NEXUS (28.6 kWh usable, per BigBattery's per-unit figure) is roughly a day and a half to two days of autonomy at that rate; three (42.9 kWh) stretches toward three days. On power, keep simultaneous loads under the 6000XP's 6,000W rating — the battery side is never the constraint here, since even one NEXUS supports about 7.6 kW continuous per BigBattery. And 8,000W of PV (per EG4) refills a bank this size quickly in decent sun.\u003c\/p\u003e\n\n\u003ch2\u003eInstallation\u003c\/h2\u003e\n\u003cp\u003eEach battery cabinet weighs approximately 315 lb, so plan floor space and the move for two or three of them, plus wall space for the inverter. The AC side — panel interconnection, overcurrent protection, grounding, bonding — belongs to a licensed electrician working to the National Electrical Code (NEC) and local codes; most jurisdictions require a permit and inspection for energy storage. Keep the batteries in a dry space above freezing; BigBattery's published charge range starts at 32°F.\u003c\/p\u003e\n\n\u003ch2\u003eWarranty \u0026amp; Support\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eBatteries:\u003c\/strong\u003e covered by BigBattery's 12-Year Limited Warranty — in BigBattery's words, “BigBattery, Inc. guarantees that its products will be free from defects in material and workmanship for a period of twelve (12) years.” No registration needed, per BigBattery. \u003cstrong\u003eInverter:\u003c\/strong\u003e the EG4 6000XP carries a 5-year full parts replacement or full product replacement warranty, per EG4, which states the warranty “must be registered within the first year of purchase or provide proof of purchase from an EG4 authorized distributor to remain valid.”\u003c\/p\u003e\n\u003cp\u003eBigBattery publishes a 30-Day Money Back Guarantee; per BigBattery, non-defective returns are refunded at purchase price minus a 20% restocking fee, excluding shipping. All returns require a Return Merchandise Authorization (RMA) before anything ships back — call OffGrid Horizon at (302) 496-3554 and we'll open the RMA or warranty claim. We're a family-owned authorized BigBattery partner, and BigBattery backs its batteries with lifetime USA-based technical support.\u003c\/p\u003e\n\n\u003ch2\u003eShipping\u003c\/h2\u003e\n\u003cp\u003eThis kit ships as palletized freight within the United States — two or three battery cabinets plus the inverter. Inspect every pallet before signing: note any damage on the delivery receipt and contact us promptly — that notation keeps a freight claim simple.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eWhat exactly does the listed price include?\u003c\/h3\u003e\n\u003cp\u003eThe Battery Configuration you select — two or three NEXUS batteries — plus one EG4 6000XP inverter. The price updates with your selection. Panels and racking are separate.\u003c\/p\u003e\n\u003ch3\u003eTwo batteries or three?\u003c\/h3\u003e\n\u003cp\u003eSize to your daily consumption and the cloudy stretch you want to cover. Households near 14–18 kWh\/day usually do well at 28.6 kWh usable; heavier use or longer weather points to three. The bank grows later too — up to 15 in parallel, per BigBattery.\u003c\/p\u003e\n\u003ch3\u003eIs this a grid-tie system?\u003c\/h3\u003e\n\u003cp\u003eNo — the 6000XP is an off-grid inverter, and per BigBattery the pairing is sold for home backup and off-grid operation, not as a grid-interactive (sell-back) system.\u003c\/p\u003e\n\u003ch3\u003eIs 6,000W enough output for this much storage?\u003c\/h3\u003e\n\u003cp\u003eIf your simultaneous loads stay under 6,000W — typical for cabins and efficient homesteads — yes; deep storage is about autonomy, not peak power. For heavier simultaneous loads, see the EG4 12000XP V2 version.\u003c\/p\u003e\n\u003ch3\u003eWhat about inverter warranty registration?\u003c\/h3\u003e\n\u003cp\u003ePer EG4, register within the first year or keep proof of purchase from an authorized distributor. Keep your order confirmation, and call us if you'd like a hand.\u003c\/p\u003e\n\u003ch3\u003eDo I need an electrician?\u003c\/h3\u003e\n\u003cp\u003eYes — AC interconnection, grounding, and code compliance are work for a licensed electrician, and most jurisdictions require a permit and inspection.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003eWant a sanity check on your load list before you pick two or three batteries? Call OffGrid Horizon at (302) 496-3554 — family-owned, authorized BigBattery partner.\u003c\/em\u003e\u003c\/p\u003e","brand":"BigBattery","offers":[{"title":"2 × NEXUS — 30 kWh","offer_id":49051030126747,"sku":"K0153","price":7689.99,"currency_code":"USD","in_stock":true},{"title":"3 × NEXUS — 45 kWh","offer_id":49051030159515,"sku":"K0157","price":10734.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0746\/0614\/9787\/files\/EG4-6000XP-NEXUS-1.png?v=1784676210"},{"product_id":"bigbattery-nexus-eg4-12000xp-v2-off-grid-kit-30-45-kwh-48v-lifepo4","title":"BigBattery NEXUS + EG4 12000XP V2 Off-Grid Kit | 30–45 kWh | 48V LiFePO4","description":"\u003cp\u003eThe whole-home configuration of the NEXUS line: two or three BigBattery NEXUS 48V LiFePO4 batteries — 280Ah and 14.3 kWh usable each, per BigBattery — with the EG4 12000XP V2 off-grid inverter: 12,000W of continuous split-phase 120\/240V output, up to 24,000W of PV through two 35A MPPTs, and per EG4 the starting muscle to bring up a 5-ton air conditioner without a soft start. With two or more batteries, the bank supports the inverter's full continuous rating — each NEXUS contributes 140A (about 7.6 kW), per BigBattery. It is an off-grid system; the grid and generator inputs are for charging and bypass, per EG4, not sell-back.\u003c\/p\u003e\n\n\u003ch2\u003eWho This Is For\u003c\/h2\u003e\n\u003cp\u003eFull-size off-grid homes running well pumps, HVAC, electric kitchen appliances, and shop tools at the same time — households that cycle the bank every day and want both the output headroom and the storage depth to do it without a generator carrying the evenings. If your loads are cabin-scale, the EG4 6000XP version keeps the same battery platform with a smaller inverter.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eChoose 2 × NEXUS (30 kWh class) or 3 × NEXUS (45 kWh class)\u003c\/strong\u003e — 28.6 or 42.9 kWh usable, adding BigBattery's 14.3 kWh per-unit figure\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e12,000W continuous split-phase 120\/240V output\u003c\/strong\u003e, per EG4; surge rated 18,000W (5 seconds), per BigBattery's kit listing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUp to 24,000W of PV input\u003c\/strong\u003e through two 35A MPPTs, per EG4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStarts a 5-ton AC without a soft start\u003c\/strong\u003e, per EG4; generator input up to 90A, grid input up to 100A, 100A bypass, per EG4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eParallels up to 16 inverters\u003c\/strong\u003e, per EG4; batteries parallel up to 15 units, per BigBattery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNEXUS batteries: 6,000+ cycle life\u003c\/strong\u003e, self-heating function, aerosol fire suppression, RS485 \/ RJ45 \/ CAN communications, per BigBattery\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy BigBattery\u003c\/h2\u003e\n\u003cp\u003eBigBattery is a US company building LiFePO4 energy storage for off-grid and home backup use. NEXUS batteries ship from Texas, carry a 12-Year Limited Warranty, and are backed by lifetime USA-based technical support, per BigBattery — here matched with EG4's high-output XP-series inverter. Browse our \u003ca href=\"\/collections\/eg4\"\u003eEG4 collection\u003c\/a\u003e for the rest of the line.\u003c\/p\u003e\n\n\u003ch2\u003eWhat's In the Kit\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e2 or 3 × \u003ca href=\"\/products\/bigbattery-nexus-48v-lifepo4-battery-15-kwh\"\u003eBigBattery NEXUS 48V LiFePO4 battery\u003c\/a\u003e — select from the Battery Configuration menu; the price shown is for the configuration selected\u003c\/li\u003e\n\u003cli\u003e1 × \u003ca href=\"\/products\/eg4-12000xp-v2-off-grid-inverter-12-kw-output-split-phase\"\u003eEG4 12000XP V2 off-grid inverter\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eSolar panels, racking, and array wiring are not included. BigBattery's kit listing does not itemize cables or accessories, so call us at (302) 496-3554 before ordering and we'll confirm exactly what ships with your configuration.\u003c\/p\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBatteries\u003c\/td\u003e\n\u003ctd\u003e2 or 3 × BigBattery NEXUS, 48V class (51.2V nominal), LiFePO4, 280Ah each\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUsable energy\u003c\/td\u003e\n\u003ctd\u003e14.3 kWh per battery, per BigBattery — 28.6 kWh (2 units) or 42.9 kWh (3 units) total\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery max continuous discharge\u003c\/td\u003e\n\u003ctd\u003e140A (7.6 kW) per battery, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery cycle life\u003c\/td\u003e\n\u003ctd\u003e6,000+ cycles, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery communications\u003c\/td\u003e\n\u003ctd\u003eRS485 \/ RJ45 \/ CAN; compatible with all EG4 inverters, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery dimensions \/ weight\u003c\/td\u003e\n\u003ctd\u003e19.7 × 27.5 × 15.7 in; approx. 315 lb — each\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInverter\u003c\/td\u003e\n\u003ctd\u003eEG4 12000XP V2 — 12,000W continuous, split-phase 120\/240V, per EG4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurge\u003c\/td\u003e\n\u003ctd\u003e18,000W (5 s), per BigBattery's kit listing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSolar input\u003c\/td\u003e\n\u003ctd\u003eUp to 24,000W through two 35A MPPTs, per EG4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAC input \/ bypass\u003c\/td\u003e\n\u003ctd\u003eGenerator up to 90A; grid up to 100A; 100A bypass, per EG4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInverter parallel capability\u003c\/td\u003e\n\u003ctd\u003eUp to 16 units, per EG4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery warranty\u003c\/td\u003e\n\u003ctd\u003e12-Year Limited Warranty, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInverter warranty\u003c\/td\u003e\n\u003ctd\u003e5 years, per BigBattery's kit listing (EG4 warranty terms apply)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eKit SKU\u003c\/td\u003e\n\u003ctd\u003eK0155 (2 batteries) \/ K0156 (3 batteries)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eSizing Your Off-Grid Home\u003c\/h2\u003e\n\u003cp\u003eExample assumptions for a full-size off-grid home — label and adjust for your own site: refrigerator 1.5 kWh\/day, freezer 1.0, lighting 1.0, well pump 1.5, electronics 1.5, laundry and kitchen 3.0, plus air conditioning at roughly 8–15 kWh\/day in season depending on tonnage and climate. Call it 17–25 kWh\/day in the demanding months.\u003c\/p\u003e\n\u003cp\u003eTwo NEXUS (28.6 kWh usable, per BigBattery's per-unit figure) covers about a day of that; three (42.9 kWh) buys the margin that gets you through weather. On power, two batteries support about 280A \/ 15.2 kW continuous by simple addition of BigBattery's per-unit figures — above the inverter's 12,000W rating — and three raise that ceiling further for surge-heavy homes. A large PV array (the inverter accepts up to 24,000W, per EG4) shortens recovery after cloudy days.\u003c\/p\u003e\n\n\u003ch2\u003eInstallation\u003c\/h2\u003e\n\u003cp\u003eEach battery cabinet weighs approximately 315 lb, so plan floor space and the move for two or three of them. Wiring 12,000W of split-phase output into a main panel — interconnection, overcurrent protection, grounding, bonding — belongs to a licensed electrician working to the National Electrical Code (NEC) and local codes; most jurisdictions require a permit and inspection for energy storage. Keep the batteries in a dry space above freezing; BigBattery's published charge range starts at 32°F.\u003c\/p\u003e\n\n\u003ch2\u003eWarranty \u0026amp; Support\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eBatteries:\u003c\/strong\u003e covered by BigBattery's 12-Year Limited Warranty — in BigBattery's words, “BigBattery, Inc. guarantees that its products will be free from defects in material and workmanship for a period of twelve (12) years.” No registration needed, per BigBattery. \u003cstrong\u003eInverter:\u003c\/strong\u003e 5-year manufacturer warranty, per BigBattery's kit listing; EG4's warranty terms apply, and EG4 asks that products be registered or accompanied by proof of purchase from an authorized distributor — keep your order confirmation.\u003c\/p\u003e\n\u003cp\u003eBigBattery publishes a 30-Day Money Back Guarantee; per BigBattery, non-defective returns are refunded at purchase price minus a 20% restocking fee, excluding shipping. All returns require a Return Merchandise Authorization (RMA) before anything ships back — call OffGrid Horizon at (302) 496-3554 and we'll open the RMA or warranty claim. We're a family-owned authorized BigBattery partner, and BigBattery backs its batteries with lifetime USA-based technical support.\u003c\/p\u003e\n\n\u003ch2\u003eShipping\u003c\/h2\u003e\n\u003cp\u003eThis kit ships as palletized freight within the United States — two or three battery cabinets plus the inverter. Inspect every pallet before signing: note any damage on the delivery receipt and contact us promptly — that notation keeps a freight claim simple.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eWhat exactly does the listed price include?\u003c\/h3\u003e\n\u003cp\u003eThe Battery Configuration you select — two or three NEXUS batteries — plus one EG4 12000XP V2 inverter. The price updates with your selection. Panels and racking are separate.\u003c\/p\u003e\n\u003ch3\u003eCan the bank feed 12,000W continuously?\u003c\/h3\u003e\n\u003cp\u003eYes, with two or more batteries: each NEXUS supports 140A (about 7.6 kW) continuous per BigBattery, so two units support roughly 15.2 kW by simple addition.\u003c\/p\u003e\n\u003ch3\u003eTwo batteries or three?\u003c\/h3\u003e\n\u003cp\u003eSize to daily consumption and the weather you want to ride out. Homes near 17–20 kWh\/day usually run well at 28.6 kWh usable; heavier use or multi-day cloud points to three. The bank grows later too — up to 15 in parallel, per BigBattery.\u003c\/p\u003e\n\u003ch3\u003eIs this a grid-tie system?\u003c\/h3\u003e\n\u003cp\u003eNo — the 12000XP V2 is an off-grid inverter. Its grid and generator inputs are for charging and bypass, per EG4; it is not sold as a grid-interactive (sell-back) system.\u003c\/p\u003e\n\u003ch3\u003eWill it start my air conditioner?\u003c\/h3\u003e\n\u003cp\u003ePer EG4, the 12000XP V2 can start a 5-ton AC without a soft start, with 18,000W of 5-second surge per BigBattery's listing. Bring us your nameplate figures and we'll confirm the whole load picture.\u003c\/p\u003e\n\u003ch3\u003eDo I need an electrician?\u003c\/h3\u003e\n\u003cp\u003eYes — AC interconnection, grounding, and code compliance are work for a licensed electrician, and most jurisdictions require a permit and inspection.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003ePlanning a whole-home off-grid build? Call OffGrid Horizon at (302) 496-3554 — family-owned, authorized BigBattery partner, and we'll help you size it honestly.\u003c\/em\u003e\u003c\/p\u003e","brand":"BigBattery","offers":[{"title":"2 × NEXUS — 30 kWh","offer_id":49051030978715,"sku":"K0155","price":8085.0,"currency_code":"USD","in_stock":true},{"title":"3 × NEXUS — 45 kWh","offer_id":49051031011483,"sku":"K0156","price":11130.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0746\/0614\/9787\/files\/EG4-12000XP-NEXUS-5.png?v=1784676233"},{"product_id":"bigbattery-ethos-eg4-12000xp-v2-off-grid-kit-15-36-30-72-kwh-48v-lifepo4","title":"BigBattery ETHOS + EG4 12000XP V2 Off-Grid Kit | 15.36–30.72 kWh | 48V LiFePO4","description":"\u003cp\u003eThis kit pairs BigBattery's stackable ETHOS 48V LiFePO4 battery platform with the \u003ca href=\"\/products\/eg4-12000xp-v2-off-grid-inverter-12-kw-output-split-phase\"\u003eEG4 12000XP V2 off-grid inverter\u003c\/a\u003e. Per EG4, the 12000XP delivers 12 kW of continuous split-phase 120\/240V AC output, accepts up to 24 kW of PV input through two 35A MPPTs, and is built for installations that do not require grid sellback. This listing starts at 15.36 kWh of ETHOS storage (three 5.12 kWh modules) and is configurable to 30.72 kWh, with closed-loop communication between battery and inverter per BigBattery.\u003c\/p\u003e\n\n\u003ch2\u003eWho This System Is For\u003c\/h2\u003e\n\u003cp\u003eOff-grid homes and homesteads with real simultaneous loads — well pump, mini-splits, shop tools, and kitchen appliances at once — and grid-connected homes that want robust backup without utility export paperwork. Per EG4, the 12000XP can start a 5-ton air conditioner without a soft start, which makes it a practical choice where heavy motor loads are part of daily life.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e12 kW continuous split-phase 120\/240V output\u003c\/strong\u003e, per EG4 — heavy simultaneous loads without load-shedding gymnastics\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUp to 24 kW of PV input\u003c\/strong\u003e through two 35A MPPTs, per EG4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStarts a 5-ton A\/C without a soft start\u003c\/strong\u003e, per EG4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e100A grid input or 90A generator input\u003c\/strong\u003e for charging and bypass, with 2-wire generator auto-start, per EG4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCertified battery platform:\u003c\/strong\u003e ETHOS carries UL9540, UL9540A, UL1973, and UN38.3, per BigBattery; the inverter line is UL1741 listed per BigBattery's kit page\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClosed-loop communication\u003c\/strong\u003e between ETHOS and the inverter, per BigBattery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExpandable:\u003c\/strong\u003e stack additional ETHOS modules (up to 16 parallel connections per control box, per BigBattery) or parallel up to 16 inverters, per EG4\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy BigBattery\u003c\/h2\u003e\n\u003cp\u003eBigBattery is a US-based energy storage company that has been building lithium battery systems since 2011 and, per BigBattery, is trusted by more than 50,000 Americans. BigBattery states its products are designed and engineered in Texas, includes free lifetime tech support with every product, and backs its batteries with a 12-Year Limited Warranty — described by BigBattery as \"the longest warranty in the battery industry.\" OffGrid Horizon is a family-owned authorized BigBattery partner. See the full \u003ca href=\"\/collections\/bigbattery\"\u003eBigBattery collection\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eWhat's In the Kit\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1 × EG4 12000XP V2 off-grid inverter\u003c\/li\u003e\n\u003cli\u003e3 × BigBattery ETHOS 48V 5.12 kWh LiFePO4 modules — 15.36 kWh base configuration for this listing, expandable to 30.72 kWh\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCall (302) 496-3554 to confirm the configuration and accessories that ship with this SKU.\u003c\/strong\u003e BigBattery lists ETHOS inverter connectors and battery-to-battery connectors as separate accessories, so confirm cabling with your order. Solar panels, racking, and array wiring are sold separately.\u003c\/p\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBattery\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBigBattery ETHOS, stackable LiFePO4 — see the \u003ca href=\"\/products\/bigbattery-ethos-48v-stackable-lifepo4-battery-5-1-kwh-modules-ul1973-ul9540a\"\u003eETHOS battery system\u003c\/a\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModule capacity\u003c\/td\u003e\n\u003ctd\u003e5.12 kWh \/ 100Ah per module, 51.2V nominal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCapacity (this listing)\u003c\/td\u003e\n\u003ctd\u003e15.36 kWh base (3 modules); configurable to 30.72 kWh\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax continuous discharge\u003c\/td\u003e\n\u003ctd\u003e250A (12,800W) for 3+ module stacks, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions \/ weight (3-module tower)\u003c\/td\u003e\n\u003ctd\u003e26.5\" W × 6.7\" D × 59.8\" H; 387 lb, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery communications\u003c\/td\u003e\n\u003ctd\u003eCAN bus \/ RS485; closed-loop with EG4, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery certifications\u003c\/td\u003e\n\u003ctd\u003eUL9540, UL9540A, UL1973, UN38.3, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCycle life\u003c\/td\u003e\n\u003ctd\u003e3,500–5,000 cycles (80% DoD, 0.5C), per BigBattery's spec sheet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery warranty\u003c\/td\u003e\n\u003ctd\u003eBigBattery 12-Year Limited Warranty\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInverter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEG4 12000XP V2 off-grid (per EG4)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAC output\u003c\/td\u003e\n\u003ctd\u003e12 kW continuous, split-phase 120\/240V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePV input\u003c\/td\u003e\n\u003ctd\u003eUp to 24 kW; two 35A MPPTs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGrid \/ generator input\u003c\/td\u003e\n\u003ctd\u003e100A from grid or 90A from generator; 100A bypass; 2-wire gen start\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGrid export\u003c\/td\u003e\n\u003ctd\u003eNot designed for grid sellback, per EG4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParallel capability\u003c\/td\u003e\n\u003ctd\u003eUp to 16 units, per EG4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInverter warranty\u003c\/td\u003e\n\u003ctd\u003e5-year, per BigBattery's kit materials (registration per EG4 terms)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eGrid-Tied, Off-Grid, or Backup?\u003c\/h2\u003e\n\u003cp\u003eThe 12000XP is an off-grid inverter: per EG4, it is designed for installations not requiring grid sellback, so it does not export power to the utility. It can still use the grid — up to 100A of input for battery charging and pass-through bypass — which makes it a strong backup platform for grid-connected homes that do not want export interconnection. Whole-home backup is possible with adequate design, but coverage is load-dependent; 12 kW of continuous output handles most households' simultaneous loads.\u003c\/p\u003e\n\n\u003ch2\u003eInstallation\u003c\/h2\u003e\n\u003cp\u003eAll AC and DC wiring — panel interconnection, grounding, bonding, and overcurrent protection — must be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and local amendments. Even off-grid and non-export systems typically require a permit and inspection in most jurisdictions. If the system connects to a grid-served panel for charging or bypass, your electrician should verify the arrangement against current NEC requirements for energy storage systems; no utility export interconnection is needed since the 12000XP does not sell power back.\u003c\/p\u003e\n\n\u003ch2\u003eWarranty \u0026amp; Support\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eBattery — BigBattery 12-Year Limited Warranty.\u003c\/strong\u003e Per BigBattery: \"If any covered component within your battery fails due to a defect in materials or workmanship within the 12-year warranty period, we will repair or replace the battery at our cost.\" Included accessories carry a 1-year warranty per BigBattery, and BigBattery provides free lifetime tech support for all its products.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInverter — 5-year warranty\u003c\/strong\u003e, per BigBattery's published kit materials; per EG4, inverter warranties must be registered within the first year of purchase (or proof of purchase from an EG4 authorized distributor provided) to remain valid.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eReturns and warranty claims require an RMA.\u003c\/strong\u003e Contact us before shipping anything back — all returns must be authorized with a Return Merchandise Authorization first. OffGrid Horizon is a family-owned authorized BigBattery partner: call (302) 496-3554 and we will help open the claim and coordinate service.\u003c\/p\u003e\n\n\u003ch2\u003eShipping\u003c\/h2\u003e\n\u003cp\u003eThis kit ships as palletized LTL freight within the continental United States; curbside liftgate delivery is standard for residential addresses. The three-module ETHOS tower weighs 387 lb per BigBattery, plus the inverter — plan for help on delivery day. Before signing the delivery receipt, count the pieces and inspect the packaging; note any damage or shortage on the receipt with the driver and contact us immediately so we can open a freight claim. Per BigBattery, standard domestic orders are projected to take 7–12 days to deliver.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eCan the 12000XP sell power back to the grid?\u003c\/h3\u003e\n\u003cp\u003eNo — per EG4, the XP line is designed for installations not requiring grid sellback. The grid can be used as a charging source and bypass (up to 100A input), but the inverter does not export.\u003c\/p\u003e\n\u003ch3\u003eWhat exactly ships at the listed price?\u003c\/h3\u003e\n\u003cp\u003eThis listing starts at the 15.36 kWh configuration: one 12000XP V2 and three ETHOS modules. Call (302) 496-3554 to confirm accessories and to configure 20.48 or 30.72 kWh instead.\u003c\/p\u003e\n\u003ch3\u003eCan it run my air conditioner?\u003c\/h3\u003e\n\u003cp\u003ePer EG4, the 12000XP can start a 5-ton A\/C without a soft start. Total coverage still depends on what else is running at the same time.\u003c\/p\u003e\n\u003ch3\u003eDoes it support a generator?\u003c\/h3\u003e\n\u003cp\u003eYes — per EG4, up to 90A of generator input with 2-wire auto start\/stop, plus a programmable Smart Port for AC coupling or smart-load control.\u003c\/p\u003e\n\u003ch3\u003eHow big a solar array can I connect?\u003c\/h3\u003e\n\u003cp\u003ePer EG4, up to 24 kW of PV input through two 35A MPPTs. Panels, racking, and wiring are sized to your site and sold separately.\u003c\/p\u003e\n\u003ch3\u003eCan the system grow later?\u003c\/h3\u003e\n\u003cp\u003eYes, in two directions: stack more ETHOS modules (up to 16 parallel connections per control box, per BigBattery) or parallel up to 16 inverters, per EG4.\u003c\/p\u003e\n\u003ch3\u003eWill the battery charge in freezing weather?\u003c\/h3\u003e\n\u003cp\u003ePer BigBattery, the ETHOS charge range is 32°F to 113°F; the BMS restricts charging below freezing, so install the tower in an insulated or conditioned space in cold climates.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003eSizing an off-grid system is mostly about your load list — call OffGrid Horizon at (302) 496-3554 and we'll walk through it with you. Family-owned, authorized BigBattery partner.\u003c\/em\u003e\u003c\/p\u003e","brand":"BigBattery","offers":[{"title":"3 × ETHOS — 15.36 kWh","offer_id":49051031994523,"sku":"K0184","price":6020.0,"currency_code":"USD","in_stock":true},{"title":"4 × ETHOS — 20.48 kWh","offer_id":49051032027291,"sku":"K0710","price":7470.0,"currency_code":"USD","in_stock":true},{"title":"6 × ETHOS — 30.72 kWh","offer_id":49051032060059,"sku":"K0711","price":9970.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0746\/0614\/9787\/files\/Off-Grid-1x-2x-1.png?v=1784676258"},{"product_id":"bigbattery-ethos-eg4-6000xp-off-grid-kit-15-36-kwh-48v-lifepo4","title":"BigBattery ETHOS + EG4 6000XP Off-Grid Kit | 15.36 kWh | 48V LiFePO4","description":"\u003cp\u003eA compact off-grid package: three stackable BigBattery ETHOS 48V 5.12 kWh LiFePO4 modules — 15.36 kWh in a single tower — paired with the \u003ca href=\"\/products\/eg4-6000xp-off-grid-inverter-6-kw-output-8-kw-pv-input-split-phase\"\u003eEG4 6000XP off-grid inverter\u003c\/a\u003e. Per EG4, the 6000XP delivers 6 kW of split-phase 120\/240V output, accepts 8 kW of PV input through dual MPPTs, and idles as low as 30W with PV. Per BigBattery, ETHOS and the 6000XP run closed-loop communication for coordinated charging and accurate state-of-charge reporting.\u003c\/p\u003e\n\n\u003ch2\u003eWho This System Is For\u003c\/h2\u003e\n\u003cp\u003eCabins, tiny homes, and well-defined essential-loads backup: refrigeration, lighting, electronics, a water pump, and a moderate 240V load. Six kilowatts covers that mix comfortably, and 15.36 kWh typically carries an efficient small household overnight. If your load list includes heavy simultaneous 240V equipment, step up to the ETHOS + \u003ca href=\"\/products\/eg4-12000xp-v2-off-grid-inverter-12-kw-output-split-phase\"\u003eEG4 12000XP V2\u003c\/a\u003e kit instead.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e15.36 kWh of LiFePO4 storage\u003c\/strong\u003e — three 5.12 kWh \/ 100Ah ETHOS modules in one small-footprint tower\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e6 kW continuous split-phase 120\/240V output\u003c\/strong\u003e with 8 kW of PV input via dual MPPTs, per EG4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCertified battery platform:\u003c\/strong\u003e UL9540, UL9540A, UL1973, and UN38.3, per BigBattery; the 6000XP is UL 1741 certified, per EG4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClosed-loop communication\u003c\/strong\u003e between ETHOS and the inverter, per BigBattery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGenerator-ready:\u003c\/strong\u003e dedicated GEN port accepts up to 7 kW, per EG4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow idle draw:\u003c\/strong\u003e as low as 30W with PV, per EG4 — meaningful on small daily energy budgets\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRoom to grow:\u003c\/strong\u003e add ETHOS modules (up to 16 parallel connections per control box, per BigBattery) or parallel up to 16 inverters for 96 kW combined, per EG4\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy BigBattery\u003c\/h2\u003e\n\u003cp\u003eBigBattery is a US-based energy storage company that has been building lithium battery systems since 2011 and, per BigBattery, is trusted by more than 50,000 Americans. BigBattery states its products are designed and engineered in Texas, includes free lifetime tech support with every product, and backs its batteries with a 12-Year Limited Warranty — described by BigBattery as \"the longest warranty in the battery industry.\" OffGrid Horizon is a family-owned authorized BigBattery partner.\u003c\/p\u003e\n\n\u003ch2\u003eWhat's In the Kit\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1 × EG4 6000XP all-in-one off-grid inverter\u003c\/li\u003e\n\u003cli\u003e3 × BigBattery ETHOS 48V 5.12 kWh LiFePO4 modules — one 15.36 kWh tower\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eBigBattery lists ETHOS inverter connectors and battery-to-battery connectors as separate accessories — \u003cstrong\u003ecall (302) 496-3554 to confirm the cabling and accessories included with your order.\u003c\/strong\u003e Solar panels, racking, and array wiring are sold separately.\u003c\/p\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBattery\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBigBattery ETHOS, stackable LiFePO4 — see the \u003ca href=\"\/products\/bigbattery-ethos-48v-stackable-lifepo4-battery-5-1-kwh-modules-ul1973-ul9540a\"\u003eETHOS battery system\u003c\/a\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCapacity\u003c\/td\u003e\n\u003ctd\u003e15.36 kWh \/ 300Ah (3 × 5.12 kWh \/ 100Ah modules), 51.2V nominal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax continuous discharge\u003c\/td\u003e\n\u003ctd\u003e250A (12,800W), per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions \/ weight (3-module tower)\u003c\/td\u003e\n\u003ctd\u003e26.5\" W × 6.7\" D × 59.8\" H; 387 lb, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery communications\u003c\/td\u003e\n\u003ctd\u003eCAN bus \/ RS485; closed-loop with EG4, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery certifications\u003c\/td\u003e\n\u003ctd\u003eUL9540, UL9540A, UL1973, UN38.3, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCycle life\u003c\/td\u003e\n\u003ctd\u003e3,500–5,000 cycles (80% DoD, 0.5C), per BigBattery's spec sheet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCharge temperature\u003c\/td\u003e\n\u003ctd\u003e32°F to 113°F (discharge -4°F to 140°F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery warranty\u003c\/td\u003e\n\u003ctd\u003eBigBattery 12-Year Limited Warranty\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInverter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEG4 6000XP all-in-one off-grid (per EG4)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAC output\u003c\/td\u003e\n\u003ctd\u003e6,000W continuous, split-phase 120\/240V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePV input\u003c\/td\u003e\n\u003ctd\u003e8,000W max via dual MPPTs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGrid \/ generator\u003c\/td\u003e\n\u003ctd\u003eGrid input for supplemental charging; GEN port up to 7 kW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParallel capability\u003c\/td\u003e\n\u003ctd\u003eUp to 16 units (96 kW combined), per EG4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIdle consumption\u003c\/td\u003e\n\u003ctd\u003eAs low as 30W with PV, per EG4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInverter certifications\u003c\/td\u003e\n\u003ctd\u003eUL 1741, per EG4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInverter warranty\u003c\/td\u003e\n\u003ctd\u003e5-year, per EG4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eGrid-Tied, Off-Grid, or Backup?\u003c\/h2\u003e\n\u003cp\u003eThe 6000XP is an off-grid inverter: it does not export power to the utility. Per EG4, it can accept grid input for supplemental battery charging, and its GEN port supports up to 7 kW of generator input — so it works fully off-grid, or as a non-export backup system in a grid-connected home. Backup coverage is load-dependent: 6 kW carries a defined set of essential circuits, not an entire large home running everything at once.\u003c\/p\u003e\n\n\u003ch2\u003eInstallation\u003c\/h2\u003e\n\u003cp\u003eStacking the modules and mounting the inverter are manageable tasks, but all AC wiring — panel interconnection, grounding, bonding, and overcurrent protection — must be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and local amendments. Even off-grid and non-export systems typically require a permit and inspection in most jurisdictions. No utility interconnection agreement is needed since the 6000XP does not export to the grid.\u003c\/p\u003e\n\n\u003ch2\u003eWarranty \u0026amp; Support\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eBattery — BigBattery 12-Year Limited Warranty.\u003c\/strong\u003e Per BigBattery: \"If any covered component within your battery fails due to a defect in materials or workmanship within the 12-year warranty period, we will repair or replace the battery at our cost.\" Included accessories carry a 1-year warranty per BigBattery, and BigBattery provides free lifetime tech support for all its products.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInverter — 5-year warranty, per EG4.\u003c\/strong\u003e Per EG4, inverter warranties must be registered within the first year of purchase (or proof of purchase from an EG4 authorized distributor provided) to remain valid.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eReturns and warranty claims require an RMA.\u003c\/strong\u003e Contact us before shipping anything back — all returns must be authorized with a Return Merchandise Authorization first. OffGrid Horizon is a family-owned authorized BigBattery partner: call (302) 496-3554 and we will help open the claim and coordinate service.\u003c\/p\u003e\n\n\u003ch2\u003eShipping\u003c\/h2\u003e\n\u003cp\u003eThis kit ships as palletized LTL freight within the continental United States; curbside liftgate delivery is standard for residential addresses. The three-module ETHOS tower weighs 387 lb per BigBattery, plus the inverter — plan for help on delivery day. Before signing the delivery receipt, count the pieces and inspect the packaging; note any damage or shortage on the receipt with the driver and contact us immediately so we can open a freight claim. Per BigBattery, standard domestic orders are projected to take 7–12 days to deliver.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eIs 6 kW enough for my place?\u003c\/h3\u003e\n\u003cp\u003eFor a cabin, tiny home, or defined essential circuits — refrigeration, lights, electronics, a water pump, one moderate 240V load — yes, comfortably. If your list includes heavy simultaneous 240V loads (large A\/C plus well pump plus shop tools), look at the 12000XP V2 kit instead.\u003c\/p\u003e\n\u003ch3\u003eCan it sell power back to the grid?\u003c\/h3\u003e\n\u003cp\u003eNo. The 6000XP is an off-grid inverter; per EG4 it accepts grid input for supplemental charging but does not export to the utility.\u003c\/p\u003e\n\u003ch3\u003eDoes it support a generator?\u003c\/h3\u003e\n\u003cp\u003eYes — per EG4, a dedicated GEN port accepts up to 7 kW of generator input for charging when solar falls short.\u003c\/p\u003e\n\u003ch3\u003eAre solar panels included?\u003c\/h3\u003e\n\u003cp\u003eNo. The 6000XP accepts up to 8 kW of PV via dual MPPTs, per EG4; panels, racking, and wiring are sized to your site and sold separately. The system also runs as a grid- or generator-charged battery system without solar.\u003c\/p\u003e\n\u003ch3\u003eCan I expand later?\u003c\/h3\u003e\n\u003cp\u003eYes — add ETHOS modules in 5.12 kWh steps (up to 16 parallel connections per control box, per BigBattery), or parallel additional 6000XP units, up to 16 total per EG4.\u003c\/p\u003e\n\u003ch3\u003eHow does LiFePO4 handle cold weather?\u003c\/h3\u003e\n\u003cp\u003ePer BigBattery, ETHOS discharges down to -4°F, but charging is restricted below 32°F by the BMS to protect the cells. Install the tower in an insulated or conditioned space to keep charging available year-round.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003eBuilding out a cabin or homestead system? Call OffGrid Horizon at (302) 496-3554 — we're a family-owned authorized BigBattery partner and will help you match the kit to your load list.\u003c\/em\u003e\u003c\/p\u003e","brand":"BigBattery","offers":[{"title":"3 × ETHOS — 15.36 kWh","offer_id":49051033632923,"sku":"K0709","price":5619.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0746\/0614\/9787\/files\/Off-Grid-1x-1x.png?v=1784676280"},{"product_id":"apex-6-5k-off-grid-inverter-6-5-kw-48v-split-phase","title":"APEX 6.5K Off-Grid Inverter | 6.5 kW | 48V Split-Phase","description":"\u003cp\u003eThe BigBattery APEX 6.5K is an all-in-one off-grid inverter for 48V battery banks: a 6,500W split-phase 120\/240V pure sine wave inverter, dual MPPT solar charge controllers, and a grid\/generator battery charger in one indoor-rated unit. Per BigBattery, it runs closed-loop with the NEXUS, ETHOS, and HUSKY 2 INV battery platforms. OffGrid Horizon is a family-owned authorized BigBattery partner serving customers across the US.\u003c\/p\u003e\n\n\u003ch2\u003eWho This Is For\u003c\/h2\u003e\n\u003cp\u003eCabins, small off-grid homes, guest houses, and essential-loads backup where 6,500W of continuous output covers the load list. Split-phase 120\/240V output means it can feed a standard US panel, including 240V circuits such as well pumps. If your plans include heavier simultaneous loads, compare the \u003ca href=\"\/products\/apex-10k-off-grid-inverter-10-kw-48v-split-phase\"\u003eAPEX 10K\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e6,500W rated output \/ 13,000VA maximum\u003c\/strong\u003e, split-phase 120\/240Vac pure sine wave, per BigBattery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual MPPT solar input\u003c\/strong\u003e — 5,000W per tracker (10,000W total), 125–450Vdc MPPT range, 550Vdc max open-circuit voltage, 18A max input per tracker\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuilt-in charging\u003c\/strong\u003e — up to 140A from solar, 80A from grid or generator, 140A max hybrid charge current\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwo AC inputs\u003c\/strong\u003e (grid and generator) with 10ms typical switching time\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClosed-loop battery communications\u003c\/strong\u003e — RS485 \/ CAN \/ USB \/ dry contact; per BigBattery, compatible with NEXUS, ETHOS, and HUSKY 2 INV, with an optional Wi-Fi module for monitoring\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eParallel up to 6 units\u003c\/strong\u003e; per BigBattery, three or more can form three-phase output\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUL1741 listed\u003c\/strong\u003e, plus FCC Part 15 Class B, RoHS, EN61000-6-1, IEC62109-1\/-2, per BigBattery\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy BigBattery\u003c\/h2\u003e\n\u003cp\u003eBigBattery is a US-based company known for its LiFePO4 battery platforms; the APEX line is its matching 48V off-grid inverter family, designed so battery and inverter share data out of the box. Per BigBattery, APEX inverters carry a 5-year warranty with Lifetime USA-Based Tech Support.\u003c\/p\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eRated output power\u003c\/td\u003e\n\u003ctd\u003e6,500W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax output power\u003c\/td\u003e\n\u003ctd\u003e13,000VA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput\u003c\/td\u003e\n\u003ctd\u003e120\/240Vac single\/split-phase, pure sine wave, 50\/60Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery voltage\u003c\/td\u003e\n\u003ctd\u003e48V nominal (40–60Vdc range)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMPPT trackers\u003c\/td\u003e\n\u003ctd\u003e2 (1 + 1)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax PV input power\u003c\/td\u003e\n\u003ctd\u003e5,000W + 5,000W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMPPT voltage range\u003c\/td\u003e\n\u003ctd\u003e125–450Vdc\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax PV open-circuit voltage\u003c\/td\u003e\n\u003ctd\u003e550Vdc per tracker\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax PV input current\u003c\/td\u003e\n\u003ctd\u003e18A + 18A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax solar charging current\u003c\/td\u003e\n\u003ctd\u003e140A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax grid\/generator charging current\u003c\/td\u003e\n\u003ctd\u003e80A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAC inputs\u003c\/td\u003e\n\u003ctd\u003e2 (grid and generator)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSwitching time\u003c\/td\u003e\n\u003ctd\u003e10ms (typical)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication\u003c\/td\u003e\n\u003ctd\u003eRS485 \/ CAN \/ USB \/ dry contact; optional Wi-Fi module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParallel capability\u003c\/td\u003e\n\u003ctd\u003eUp to 6 units\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNoise\u003c\/td\u003e\n\u003ctd\u003eUnder 60dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating temperature\u003c\/td\u003e\n\u003ctd\u003e14°F to 131°F (derates above 113°F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProtection\u003c\/td\u003e\n\u003ctd\u003eIP20, indoor only\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e25.51 x 16.14 x 5.51 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e48 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCertifications\u003c\/td\u003e\n\u003ctd\u003eUL1741, FCC Part 15 Class B, RoHS, EN61000-6-1, IEC62109-1\/-2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e5 years, as published by BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eINV034\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eAll specifications per BigBattery's published product page and spec sheet.\u003c\/p\u003e\n\n\u003ch2\u003eWhat It Runs\u003c\/h2\u003e\n\u003cp\u003eThe figures below are planning estimates only — actual wattage varies by model, so check appliance nameplates and confirm with your installer. Keep total running watts under the 6,500W rating, and keep motor-start surges within the 13,000VA maximum, per BigBattery.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eRefrigerator: roughly 150–400W running\u003c\/li\u003e\n\u003cli\u003eChest freezer: roughly 100–350W running\u003c\/li\u003e\n\u003cli\u003e1 HP well pump (240V): roughly 1,000–1,500W running, with a start surge of 2–3 times that\u003c\/li\u003e\n\u003cli\u003eMicrowave: roughly 1,000–1,500W while cooking\u003c\/li\u003e\n\u003cli\u003eSmall mini-split or window AC: roughly 500–1,500W running\u003c\/li\u003e\n\u003cli\u003eLights and electronics: roughly 200–500W\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eExample (estimate): refrigerator 300W + freezer 200W + well pump 1,200W + mini-split 1,000W + lights and electronics 400W is about 3,100W running — within the 6,500W rating, with headroom left for pump starts.\u003c\/p\u003e\n\n\u003ch2\u003eInstallation\u003c\/h2\u003e\n\u003cp\u003eThe APEX 6.5K is IP20 rated for indoor installation only — a garage, utility room, or similar protected space. Keep PV strings inside the 125–450Vdc MPPT window and never above 550Vdc open-circuit, including cold-weather voltage rise. Connecting the output to a distribution panel involves grounding, bonding, permits, and local code — use a licensed electrician. Run the battery communication cable per BigBattery's manual for closed-loop operation with compatible 48V batteries.\u003c\/p\u003e\n\n\u003ch2\u003eWarranty \u0026amp; Support\u003c\/h2\u003e\n\u003cp\u003ePer BigBattery, the APEX 6.5K carries a 5-year warranty with Lifetime USA-Based Tech Support. As a family-owned authorized BigBattery partner, OffGrid Horizon can help with setup questions, troubleshooting, and claims. Returns require a Return Merchandise Authorization (RMA) — contact us before shipping anything back. Call (302) 496-3554.\u003c\/p\u003e\n\n\u003ch2\u003eShipping\u003c\/h2\u003e\n\u003cp\u003eShips within the United States. The unit weighs 48 lb and travels in protective packaging; please inspect the carton on delivery, note any damage with the carrier, and contact us right away so we can make it right.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eIs this a grid-tie inverter?\u003c\/h3\u003e\n\u003cp\u003eNo. BigBattery sells the APEX 6.5K as an off-grid inverter: its AC inputs use grid or generator power for charging and pass-through, and BigBattery's materials do not describe exporting power to the grid.\u003c\/p\u003e\n\u003ch3\u003eDoes it need solar to work?\u003c\/h3\u003e\n\u003cp\u003eNo — it can run from the battery bank alone and charge from grid or generator power. Solar panels connect to the built-in MPPT inputs when you add them.\u003c\/p\u003e\n\u003ch3\u003eWhich batteries pair with it?\u003c\/h3\u003e\n\u003cp\u003ePer BigBattery, it runs closed-loop with the \u003ca href=\"\/products\/bigbattery-nexus-48v-lifepo4-battery-15-kwh\"\u003eNEXUS 48V (15 kWh)\u003c\/a\u003e, ETHOS, and \u003ca href=\"\/products\/bigbattery-48v-husky-2-inv-lithium-battery-5-12-kwh-100ah-lifepo4-rv-off-grid-marine\"\u003e48V HUSKY 2 INV\u003c\/a\u003e platforms, plus certain EG4 models. Size the bank so its continuous discharge rating covers your planned loads.\u003c\/p\u003e\n\u003ch3\u003eHow much solar can I connect?\u003c\/h3\u003e\n\u003cp\u003ePer BigBattery: up to 5,000W per MPPT tracker (10,000W total), with strings inside the 125–450Vdc operating window and below 550Vdc open-circuit.\u003c\/p\u003e\n\u003ch3\u003eCan I expand later?\u003c\/h3\u003e\n\u003cp\u003eYes — per BigBattery, up to 6 units can be paralleled, and three or more can form three-phase output.\u003c\/p\u003e\n\u003ch3\u003eWill it run 240V appliances?\u003c\/h3\u003e\n\u003cp\u003eYes — output is split-phase 120\/240V, so it can feed 240V circuits such as well pumps and dryers, provided total load stays within its ratings.\u003c\/p\u003e\n\u003ch3\u003eIs the 10ms switching time fast enough for computers?\u003c\/h3\u003e\n\u003cp\u003eBigBattery publishes a 10ms typical switching time. Many electronics ride through that; for critical equipment, a small UPS downstream is a common precaution.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003eSizing an off-grid system? Call OffGrid Horizon at (302) 496-3554 — we are a family-owned shop and glad to help you match the APEX to a battery bank and load list.\u003c\/em\u003e\u003c\/p\u003e","brand":"BigBattery","offers":[{"title":"Default Title","offer_id":49082611105947,"sku":"INV034","price":1560.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0746\/0614\/9787\/files\/APEX-6.5KMAINIMG-scaled_0148c2fc-8003-4043-9ff8-ab08f3f8bd9f.png?v=1784902435"},{"product_id":"apex-10k-off-grid-inverter-10-kw-48v-split-phase","title":"APEX 10K Off-Grid Inverter | 10 kW | 48V Split-Phase","description":"\u003cp\u003eThe BigBattery APEX 10K is the higher-output model in BigBattery's APEX line of all-in-one off-grid inverters for 48V battery banks. It combines a 10,000W split-phase 120\/240V pure sine wave inverter, dual MPPT solar charge controllers, and a grid\/generator battery charger in one indoor-rated unit, and per BigBattery it runs closed-loop with the NEXUS, ETHOS, and HUSKY 2 INV battery platforms. OffGrid Horizon is a family-owned authorized BigBattery partner serving customers across the US.\u003c\/p\u003e\n\n\u003ch2\u003eWho This Is For\u003c\/h2\u003e\n\u003cp\u003eFull-size off-grid homes, homesteads, and workshops that start and run heavier equipment — well pumps, compressors, and multiple 240V circuits at once. Per BigBattery, the APEX 10K is rated for motor loads up to 6 HP. If your load list is cabin-scale, the \u003ca href=\"\/products\/apex-6-5k-off-grid-inverter-6-5-kw-48v-split-phase\"\u003eAPEX 6.5K\u003c\/a\u003e pairs with the same batteries; note the 10K has a single AC input (grid or generator), while the 6.5K has two.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e10,000W rated output \/ 20,000VA maximum\u003c\/strong\u003e, split-phase 120\/240Vac pure sine wave, per BigBattery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMotor load capacity of 6 HP\u003c\/strong\u003e, per BigBattery's published spec\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual MPPT solar input\u003c\/strong\u003e — 5,000W + 5,500W (10,500W total), 125–450Vdc MPPT range, 550Vdc max open-circuit voltage, 22A max input per tracker\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuilt-in charging\u003c\/strong\u003e — up to 200A from solar, 120A from grid or generator, 200A max hybrid charge current\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOne AC input\u003c\/strong\u003e (grid or generator, not both simultaneously) with 10ms typical switching time\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClosed-loop battery communications\u003c\/strong\u003e — RS485 \/ CAN \/ USB \/ dry contact; per BigBattery, compatible with NEXUS, ETHOS, and HUSKY 2 INV, with an optional Wi-Fi\/GPRS module\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eParallel up to 6 units\u003c\/strong\u003e; per BigBattery, three or more can form three-phase output\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUL1741 listed\u003c\/strong\u003e, plus FCC Part 15 Class B, RoHS, EN61000-6-1, per BigBattery\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy BigBattery\u003c\/h2\u003e\n\u003cp\u003eBigBattery is a US-based company known for its LiFePO4 battery platforms; the APEX line is its matching 48V off-grid inverter family, designed so battery and inverter share data out of the box. Per BigBattery, APEX inverters carry a 5-year warranty backed by USA-based tech support.\u003c\/p\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eRated output power\u003c\/td\u003e\n\u003ctd\u003e10,000W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax output power\u003c\/td\u003e\n\u003ctd\u003e20,000VA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput\u003c\/td\u003e\n\u003ctd\u003e120\/240Vac single\/split-phase, pure sine wave, 50\/60Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMotor load capacity\u003c\/td\u003e\n\u003ctd\u003e6 HP\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery voltage\u003c\/td\u003e\n\u003ctd\u003e48V nominal (40–60Vdc range)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMPPT trackers\u003c\/td\u003e\n\u003ctd\u003e2 (1 + 1)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax PV input power\u003c\/td\u003e\n\u003ctd\u003e5,000W + 5,500W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMPPT voltage range\u003c\/td\u003e\n\u003ctd\u003e125–450Vdc\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax PV open-circuit voltage\u003c\/td\u003e\n\u003ctd\u003e550Vdc per tracker\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax PV input current\u003c\/td\u003e\n\u003ctd\u003e22A + 22A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax solar charging current\u003c\/td\u003e\n\u003ctd\u003e200A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax grid\/generator charging current\u003c\/td\u003e\n\u003ctd\u003e120A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAC inputs\u003c\/td\u003e\n\u003ctd\u003e1 (grid or generator)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSwitching time\u003c\/td\u003e\n\u003ctd\u003e10ms (typical)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication\u003c\/td\u003e\n\u003ctd\u003eRS485 \/ CAN \/ USB \/ dry contact; optional Wi-Fi\/GPRS module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParallel capability\u003c\/td\u003e\n\u003ctd\u003eUp to 6 units\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNoise\u003c\/td\u003e\n\u003ctd\u003eUnder 60dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating temperature\u003c\/td\u003e\n\u003ctd\u003e14°F to 131°F (derates above 113°F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProtection\u003c\/td\u003e\n\u003ctd\u003eIP20, indoor only\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e28.46 x 17.64 x 5.91 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e62 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCertifications\u003c\/td\u003e\n\u003ctd\u003eUL1741, FCC Part 15 Class B, RoHS, EN61000-6-1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e5 years, as published by BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eINV035\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eAll specifications per BigBattery's published product page and spec sheet.\u003c\/p\u003e\n\n\u003ch2\u003eWhat It Runs\u003c\/h2\u003e\n\u003cp\u003eThe figures below are planning estimates only — actual wattage varies by model, so check appliance nameplates and confirm with your installer. Keep total running watts under the 10,000W rating, and keep motor-start surges within the 20,000VA maximum, per BigBattery.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eRefrigerator plus chest freezer: roughly 300–700W running\u003c\/li\u003e\n\u003cli\u003e1.5 HP well pump (240V): roughly 1,500–2,200W running, with a start surge of 2–3 times that\u003c\/li\u003e\n\u003cli\u003eMini-split heat pump (one zone): roughly 500–1,500W running\u003c\/li\u003e\n\u003cli\u003eElectric water heater element: roughly 4,500W while heating\u003c\/li\u003e\n\u003cli\u003eShop equipment (air compressor, saws): roughly 1,000–2,500W each while running\u003c\/li\u003e\n\u003cli\u003eLights and electronics: roughly 300–800W\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eExample (estimate): refrigeration 500W + well pump 1,800W + mini-split 1,200W + water heater element 4,500W + lights and electronics 600W is about 8,600W running — near the 10,000W rating, which is why staggering large loads still matters even at this size.\u003c\/p\u003e\n\n\u003ch2\u003eInstallation\u003c\/h2\u003e\n\u003cp\u003eThe APEX 10K is IP20 rated for indoor installation — per BigBattery, garages, utility rooms, and similar protected environments. Keep PV strings inside the 125–450Vdc MPPT window and never above 550Vdc open-circuit, including cold-weather voltage rise. Its single AC input connects to either the grid or a generator, not both at once — plan your changeover accordingly. Connecting 10,000W of output to a distribution panel involves grounding, bonding, permits, and local code — use a licensed electrician, and run the battery communication cable per BigBattery's manual for closed-loop operation.\u003c\/p\u003e\n\n\u003ch2\u003eWarranty \u0026amp; Support\u003c\/h2\u003e\n\u003cp\u003ePer BigBattery, the APEX 10K carries a 5-year warranty backed by USA-based tech support. As a family-owned authorized BigBattery partner, OffGrid Horizon can help with setup questions, troubleshooting, and claims. Returns require a Return Merchandise Authorization (RMA) — contact us before shipping anything back. Call (302) 496-3554.\u003c\/p\u003e\n\n\u003ch2\u003eShipping\u003c\/h2\u003e\n\u003cp\u003eShips within the United States. The unit weighs 62 lb and travels in protective packaging; please inspect the carton on delivery, note any damage with the carrier, and contact us right away so we can make it right.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eIs this a grid-tie inverter?\u003c\/h3\u003e\n\u003cp\u003eNo. BigBattery sells the APEX 10K as an off-grid inverter: its AC input uses grid or generator power for charging and pass-through, and BigBattery's materials do not describe exporting power to the grid.\u003c\/p\u003e\n\u003ch3\u003eCan I connect both grid and generator?\u003c\/h3\u003e\n\u003cp\u003eNot at the same time — per BigBattery, the APEX 10K has one AC input that supports either grid or generator. If you need two dedicated AC inputs, the \u003ca href=\"\/products\/apex-6-5k-off-grid-inverter-6-5-kw-48v-split-phase\"\u003eAPEX 6.5K\u003c\/a\u003e provides them.\u003c\/p\u003e\n\u003ch3\u003eWhich batteries pair with it?\u003c\/h3\u003e\n\u003cp\u003ePer BigBattery, it runs closed-loop with the \u003ca href=\"\/products\/bigbattery-nexus-48v-lifepo4-battery-15-kwh\"\u003eNEXUS 48V (15 kWh)\u003c\/a\u003e, ETHOS, and HUSKY 2 INV platforms, plus certain EG4 models. Heavy loads drain small banks quickly, so size storage to your daily consumption and make sure the bank's continuous discharge rating covers your peak draw.\u003c\/p\u003e\n\u003ch3\u003eHow much solar can I connect?\u003c\/h3\u003e\n\u003cp\u003ePer BigBattery: 5,000W on one tracker and 5,500W on the other (10,500W total), with strings inside the 125–450Vdc operating window and below 550Vdc open-circuit.\u003c\/p\u003e\n\u003ch3\u003eWill it start a well pump?\u003c\/h3\u003e\n\u003cp\u003ePer BigBattery, the APEX 10K is rated for motor loads up to 6 HP, with 20,000VA of maximum output for starting surges. Verify your pump's horsepower and starting characteristics against those figures.\u003c\/p\u003e\n\u003ch3\u003eCan I expand later?\u003c\/h3\u003e\n\u003cp\u003eYes — per BigBattery, up to 6 units can be paralleled, and three or more can form three-phase output.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003eDeciding between the 6.5K and the 10K? Call OffGrid Horizon at (302) 496-3554 — we are a family-owned shop and glad to walk through your load list before you buy.\u003c\/em\u003e\u003c\/p\u003e","brand":"BigBattery","offers":[{"title":"Default Title","offer_id":49082611335323,"sku":"INV035","price":1770.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0746\/0614\/9787\/files\/APEX-10K-MainIMG-scaled_d97bcf1b-c90f-44ca-9f9a-0131d7af875b.png?v=1784902448"},{"product_id":"bigbattery-24v-husky-2-inv-lithium-battery-5-12-kwh-200ah-lifepo4-rv-off-grid-marine","title":"BigBattery 24V HUSKY 2 INV Lithium Battery | 5.12 kWh | 200Ah LiFePO4 | RV, Off-Grid \u0026 Marine","description":"\u003cp\u003eThe BigBattery 24V HUSKY 2 INV delivers 5.12 kWh of LiFePO4 storage — 200Ah at 24V — in a single battery built for RV, off-grid, and marine systems. The INV designation is BigBattery's inverter-communications version: CANBus\/RS485 ports let the battery share data with compatible inverter systems for coordinated charging and monitoring. OffGrid Horizon is a family-owned authorized BigBattery partner serving customers across the US.\u003c\/p\u003e\n\n\u003ch2\u003eWho This Is For\u003c\/h2\u003e\n\u003cp\u003eA 24V bank moves the same power as 12V at half the current, which means thinner cabling and less voltage drop. That makes this battery a fit for larger RVs (BigBattery lists Class A, B, and C RVs), boats, and small off-grid homes running 24V electrical systems — or builders stepping up from 12V to support a larger inverter. Per BigBattery, the INV communications are designed for 24V Victron inverter systems; in other 24V setups it operates as a standard high-capacity LiFePO4 battery.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e5.12 kWh \/ 200Ah at 24V\u003c\/strong\u003e — whole-system capacity from one battery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInverter communications (INV)\u003c\/strong\u003e — CANBus\/RS485 ports for integration with compatible 24V Victron systems, per BigBattery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e200A max continuous discharge (5,120W)\u003c\/strong\u003e and 500A peak discharge (5 seconds max), per BigBattery's published ratings\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelf-heating function\u003c\/strong\u003e for cold-climate use, with a published charge temperature range of -4°F to 113°F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIP65 \/ NEMA 4X protection rating\u003c\/strong\u003e per BigBattery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eParallel expansion\u003c\/strong\u003e — up to 16 batteries, per BigBattery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCE and UN38.3 certificates\u003c\/strong\u003e published by BigBattery\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy BigBattery\u003c\/h2\u003e\n\u003cp\u003eBigBattery is a US-based company building LiFePO4 battery systems for RV, off-grid, and marine applications, and it backs the HUSKY 2 line with a 12-Year Warranty and Lifetime USA-Based Tech Support, as published on bigbattery.com. Buying through OffGrid Horizon, an authorized partner, keeps that factory warranty intact.\u003c\/p\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal voltage\u003c\/td\u003e\n\u003ctd\u003e25.6V (24V system)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCapacity\u003c\/td\u003e\n\u003ctd\u003e200Ah \/ 5.12 kWh\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChemistry\u003c\/td\u003e\n\u003ctd\u003eLiFePO4 (lithium iron phosphate)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax continuous discharge\u003c\/td\u003e\n\u003ctd\u003e200A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax continuous power\u003c\/td\u003e\n\u003ctd\u003e5,120W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak discharge\u003c\/td\u003e\n\u003ctd\u003e500A (5 seconds max)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax charge current\u003c\/td\u003e\n\u003ctd\u003e150A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCharge temperature\u003c\/td\u003e\n\u003ctd\u003e-4°F to 113°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDischarge temperature\u003c\/td\u003e\n\u003ctd\u003e-4°F to 131°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSelf-heating\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication\u003c\/td\u003e\n\u003ctd\u003eCANBus \/ RS485\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParallel capability\u003c\/td\u003e\n\u003ctd\u003eUp to 16 units\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e18.1 in W x 12.6 in D x 9.8 in H\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e95 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProtection rating\u003c\/td\u003e\n\u003ctd\u003eIP65 \/ NEMA 4X\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCertifications\u003c\/td\u003e\n\u003ctd\u003eCE, UN38.3 (certificates published by BigBattery)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e12-Year Warranty, as published by BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eFHSKY-24051-G2-INV\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eAll specifications per BigBattery's published product page and spec sheet.\u003c\/p\u003e\n\n\u003ch2\u003e12V vs 24V vs 48V — Picking the Right HUSKY\u003c\/h2\u003e\n\u003cp\u003eAll three HUSKY 2 INV models store the same 5.12 kWh; the difference is system voltage. Choose this 24V model when your electrical system and charge sources are already 24V, or when you want lower current than 12V without rebuilding around a 48V inverter. If your appliances and chargers are 12V, the \u003ca href=\"\/products\/bigbattery-12v-husky-2-inv-lithium-battery-5-12-kwh-400ah-lifepo4-rv-off-grid-marine\"\u003e12V HUSKY 2 INV (400Ah)\u003c\/a\u003e is the simpler drop-in; if you are designing around a modern 48V off-grid inverter, look at the \u003ca href=\"\/products\/bigbattery-48v-husky-2-inv-lithium-battery-5-12-kwh-100ah-lifepo4-rv-off-grid-marine\"\u003e48V HUSKY 2 INV (100Ah)\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eInstallation\u003c\/h2\u003e\n\u003cp\u003eMount the battery in a dry, ventilated compartment, with cabling and fusing rated for up to 200A of continuous draw. Set chargers and solar controllers to a LiFePO4 profile, and follow BigBattery's manual for communication wiring to a compatible inverter. For marine installations and RV chassis wiring, we recommend a qualified installer working to applicable standards such as ABYC.\u003c\/p\u003e\n\n\u003ch2\u003eWarranty \u0026amp; Support\u003c\/h2\u003e\n\u003cp\u003ePer BigBattery, the HUSKY 2 INV carries a 12-Year Warranty with Lifetime USA-Based Tech Support. As a family-owned authorized BigBattery partner, OffGrid Horizon can help with registration, troubleshooting, and claims. Returns require a Return Merchandise Authorization (RMA) — contact us before shipping anything back. Call (302) 496-3554.\u003c\/p\u003e\n\n\u003ch2\u003eShipping\u003c\/h2\u003e\n\u003cp\u003eShips within the United States. At 95 lb, this battery travels in protective packaging; please inspect the carton on delivery, note any damage with the carrier, and contact us right away so we can make it right.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eWhat does INV mean?\u003c\/h3\u003e\n\u003cp\u003eIt is BigBattery's inverter-communications version of the HUSKY 2. CANBus\/RS485 ports let the battery report data to compatible inverter systems for closed-loop charging and monitoring.\u003c\/p\u003e\n\u003ch3\u003eWhich inverters does it communicate with?\u003c\/h3\u003e\n\u003cp\u003eBigBattery lists compatibility with 24V Victron inverter systems via communication protocols. With other equipment it works as a standard 24V LiFePO4 battery, without communications.\u003c\/p\u003e\n\u003ch3\u003eWhy choose 24V over 12V?\u003c\/h3\u003e\n\u003cp\u003eThe same wattage at half the current: smaller-gauge cable, less resistive loss, and a better match for mid-size inverters. If your existing loads are 12V, staying at 12V avoids converters.\u003c\/p\u003e\n\u003ch3\u003eCan it charge below freezing?\u003c\/h3\u003e\n\u003cp\u003ePer BigBattery, the battery includes a self-heating function and publishes a charge range of -4°F to 113°F. Follow the manual's cold-weather guidance.\u003c\/p\u003e\n\u003ch3\u003eHow large an inverter can I pair with it?\u003c\/h3\u003e\n\u003cp\u003ePer BigBattery, max continuous power is 5,120W (200A continuous). Size the inverter so its battery-side draw stays within that rating, and confirm against your inverter's specifications.\u003c\/p\u003e\n\u003ch3\u003eCan I add more batteries later?\u003c\/h3\u003e\n\u003cp\u003eYes — per BigBattery, up to 16 HUSKY 2 units can be connected in parallel.\u003c\/p\u003e\n\u003ch3\u003eIs it suitable for boats?\u003c\/h3\u003e\n\u003cp\u003eBigBattery positions the HUSKY 2 for marine systems and rates the enclosure IP65 \/ NEMA 4X. It is not intended for submersion; have marine wiring performed by a qualified installer.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003eWeighing 12V against 24V for your build? Call OffGrid Horizon at (302) 496-3554 — we are a family-owned shop and glad to talk through your system — or browse the full \u003ca href=\"\/collections\/bigbattery\"\u003eBigBattery collection\u003c\/a\u003e.\u003c\/em\u003e\u003c\/p\u003e","brand":"BigBattery","offers":[{"title":"Default Title","offer_id":49082614743195,"sku":"FHSKY-24051-G2-INV","price":1740.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0746\/0614\/9787\/files\/FHSKY-24051-G2-leftSide_V2.png?v=1784902526"},{"product_id":"bigbattery-48v-husky-2-inv-lithium-battery-5-12-kwh-100ah-lifepo4-rv-off-grid-marine","title":"BigBattery 48V HUSKY 2 INV Lithium Battery | 5.12 kWh | 100Ah LiFePO4 | RV, Off-Grid \u0026 Marine","description":"\u003cp\u003eThe BigBattery 48V HUSKY 2 INV provides 5.12 kWh of LiFePO4 storage — 100Ah at 48V — in a single portable-format battery for 48V off-grid inverter systems, RVs, and marine installations. The INV designation is BigBattery's inverter-communications version: CANBus\/RS485 ports let the battery share data with compatible inverters for closed-loop charging and monitoring. OffGrid Horizon is a family-owned authorized BigBattery partner serving customers across the US.\u003c\/p\u003e\n\n\u003ch2\u003eWho This Is For\u003c\/h2\u003e\n\u003cp\u003eBuilders starting a 48V system who want to grow storage in 5.12 kWh steps: off-grid cabins, backup-power setups, and RV or marine builds designed around a 48V inverter. Per BigBattery, the INV communications support EG4 6000XP\/12000XP and Victron MultiPlus-II 3000\/5000 inverters, and BigBattery's APEX inverter pages list the HUSKY 2 INV among their closed-loop compatible batteries.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e5.12 kWh \/ 100Ah at 48V\u003c\/strong\u003e — the voltage most modern all-in-one off-grid inverters are built around\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInverter communications (INV)\u003c\/strong\u003e — CANBus\/RS485 ports; per BigBattery, compatible with EG4 6000XP\/12000XP and Victron MultiPlus-II 3000\/5000\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e100A max continuous discharge\u003c\/strong\u003e with a recommended continuous power of 4,000W and 150A peak (3 seconds max), per BigBattery's published ratings\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelf-heating function\u003c\/strong\u003e for cold-climate use, with a published charge temperature range of -4°F to 113°F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIP65 \/ NEMA 4X protection rating\u003c\/strong\u003e per BigBattery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eParallel expansion\u003c\/strong\u003e — up to 16 batteries, per BigBattery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCE and UN38.3 certificates\u003c\/strong\u003e published by BigBattery\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy BigBattery\u003c\/h2\u003e\n\u003cp\u003eBigBattery is a US-based company building LiFePO4 battery systems for RV, off-grid, and marine applications, and it backs the HUSKY 2 line with a 12-Year Warranty and Lifetime USA-Based Tech Support, as published on bigbattery.com. Buying through OffGrid Horizon, an authorized partner, keeps that factory warranty intact.\u003c\/p\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal voltage\u003c\/td\u003e\n\u003ctd\u003e51.2V (48V system)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCapacity\u003c\/td\u003e\n\u003ctd\u003e100Ah \/ 5.12 kWh\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChemistry\u003c\/td\u003e\n\u003ctd\u003eLiFePO4 (lithium iron phosphate), 16S configuration\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax continuous discharge\u003c\/td\u003e\n\u003ctd\u003e100A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRecommended continuous power\u003c\/td\u003e\n\u003ctd\u003e4,000W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak discharge\u003c\/td\u003e\n\u003ctd\u003e150A (3 seconds max)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax charge current\u003c\/td\u003e\n\u003ctd\u003e100A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCharge temperature\u003c\/td\u003e\n\u003ctd\u003e-4°F to 113°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDischarge temperature\u003c\/td\u003e\n\u003ctd\u003e-4°F to 122°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStorage temperature\u003c\/td\u003e\n\u003ctd\u003e-4°F to 122°F (max 6 months)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSelf-heating\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication\u003c\/td\u003e\n\u003ctd\u003eCANBus \/ RS485\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible inverters (comms)\u003c\/td\u003e\n\u003ctd\u003eEG4 6000XP\/12000XP, Victron MultiPlus-II 3000\/5000, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParallel capability\u003c\/td\u003e\n\u003ctd\u003eUp to 16 units\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e18.1 in W x 12.6 in D x 9.8 in H\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e100 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProtection rating\u003c\/td\u003e\n\u003ctd\u003eIP65 \/ NEMA 4X\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCertifications\u003c\/td\u003e\n\u003ctd\u003eCE, UN38.3 (certificates published by BigBattery)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e12-Year Warranty, as published by BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eFHSKY-48051-G2-INV\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eAll specifications per BigBattery's published product page and spec sheet.\u003c\/p\u003e\n\n\u003ch2\u003e12V vs 24V vs 48V — Picking the Right HUSKY\u003c\/h2\u003e\n\u003cp\u003eAll three HUSKY 2 INV models store the same 5.12 kWh; the difference is system voltage. Choose this 48V model when you are building around a 48V off-grid inverter — higher voltage keeps current low and cabling manageable. If your rig runs 12V appliances and chargers, the \u003ca href=\"\/products\/bigbattery-12v-husky-2-inv-lithium-battery-5-12-kwh-400ah-lifepo4-rv-off-grid-marine\"\u003e12V HUSKY 2 INV (400Ah)\u003c\/a\u003e is the drop-in choice, and the \u003ca href=\"\/products\/bigbattery-24v-husky-2-inv-lithium-battery-5-12-kwh-200ah-lifepo4-rv-off-grid-marine\"\u003e24V HUSKY 2 INV (200Ah)\u003c\/a\u003e covers 24V systems.\u003c\/p\u003e\n\n\u003ch2\u003eInstallation\u003c\/h2\u003e\n\u003cp\u003eMount the battery in a dry, ventilated location, with cabling and fusing rated for up to 100A of continuous draw. Set chargers to a LiFePO4 profile within the published temperature limits, and follow BigBattery's manual for communication wiring to a compatible 48V inverter. For fixed off-grid installations tied to a distribution panel, have the AC side handled by a licensed electrician.\u003c\/p\u003e\n\n\u003ch2\u003eWarranty \u0026amp; Support\u003c\/h2\u003e\n\u003cp\u003ePer BigBattery, the HUSKY 2 INV carries a 12-Year Warranty with Lifetime USA-Based Tech Support. As a family-owned authorized BigBattery partner, OffGrid Horizon can help with registration, troubleshooting, and claims. Returns require a Return Merchandise Authorization (RMA) — contact us before shipping anything back. Call (302) 496-3554.\u003c\/p\u003e\n\n\u003ch2\u003eShipping\u003c\/h2\u003e\n\u003cp\u003eShips within the United States. At 100 lb, this battery travels in protective packaging; please inspect the carton on delivery, note any damage with the carrier, and contact us right away so we can make it right.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eWhat does INV mean?\u003c\/h3\u003e\n\u003cp\u003eIt is BigBattery's inverter-communications version of the HUSKY 2. CANBus\/RS485 ports let the battery report data to compatible inverters for closed-loop charging and monitoring.\u003c\/p\u003e\n\u003ch3\u003eWhich inverters does it communicate with?\u003c\/h3\u003e\n\u003cp\u003eBigBattery's product page lists EG4 6000XP\/12000XP and Victron MultiPlus-II 3000\/5000, and BigBattery's APEX 6.5K and 10K inverter pages list the HUSKY 2 INV among closed-loop compatible batteries. With other 48V equipment it works as a standard LiFePO4 battery, without communications.\u003c\/p\u003e\n\u003ch3\u003eWill one battery run an \u003ca href=\"\/products\/apex-6-5k-off-grid-inverter-6-5-kw-48v-split-phase\"\u003eAPEX 6.5K\u003c\/a\u003e?\u003c\/h3\u003e\n\u003cp\u003eOne HUSKY 2 INV is limited to 100A continuous discharge, with a BigBattery-recommended continuous power of 4,000W — below the inverter's 6,500W rating. Plan on paralleling batteries (up to 16, per BigBattery) if you want to draw more sustained power.\u003c\/p\u003e\n\u003ch3\u003eCan it charge below freezing?\u003c\/h3\u003e\n\u003cp\u003ePer BigBattery, the battery includes a self-heating function and publishes a charge range of -4°F to 113°F. Follow the manual's cold-weather guidance.\u003c\/p\u003e\n\u003ch3\u003eCan I add more batteries later?\u003c\/h3\u003e\n\u003cp\u003eYes — per BigBattery, up to 16 HUSKY 2 units can be connected in parallel, growing the bank in 5.12 kWh steps.\u003c\/p\u003e\n\u003ch3\u003eIs it suitable for RVs and boats?\u003c\/h3\u003e\n\u003cp\u003eBigBattery positions the HUSKY 2 for RV, marine, and off-grid applications and rates the enclosure IP65 \/ NEMA 4X. It is not intended for submersion; have chassis and marine wiring performed by a qualified installer.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003ePlanning a 48V system? Call OffGrid Horizon at (302) 496-3554 — we are a family-owned shop and glad to help you match batteries to an inverter.\u003c\/em\u003e\u003c\/p\u003e","brand":"BigBattery","offers":[{"title":"Default Title","offer_id":49082615070875,"sku":"FHSKY-48051-G2-INV","price":1870.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0746\/0614\/9787\/files\/Final.png?v=1784902537"},{"product_id":"bigbattery-nexus-48v-lifepo4-battery-15-kwh","title":"BigBattery NEXUS 48V LiFePO4 Battery | 15 kWh","description":"\u003cp\u003eThe BigBattery NEXUS is a 48V-class LiFePO4 battery for off-grid homes, cabins, and backup power systems. BigBattery's published specifications list 280Ah of capacity and 14.3 kWh of usable energy from a single floor-standing cabinet, with a 6,000+ cycle life rating and a built-in battery management system (BMS). It is the same battery at the core of our NEXUS off-grid kits with APEX and EG4 inverters.\u003c\/p\u003e\n\n\u003ch2\u003eWho This Is For\u003c\/h2\u003e\n\u003cp\u003eThe NEXUS suits off-grid households and cabin owners who want large capacity in a few cabinets rather than a wall of small rack modules, homeowners adding storage to an existing 48V inverter, and anyone planning a bank that will grow over time — per BigBattery, up to 15 units parallel together. If you want battery and inverter as a matched package, we also carry NEXUS kits built around the \u003ca href=\"\/products\/apex-6-5k-off-grid-inverter-6-5-kw-48v-split-phase\"\u003eAPEX 6.5K\u003c\/a\u003e and \u003ca href=\"\/products\/eg4-6000xp-off-grid-inverter-6-kw-output-8-kw-pv-input-split-phase\"\u003eEG4 6000XP\u003c\/a\u003e inverters.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e280Ah capacity, 14.3 kWh usable energy\u003c\/strong\u003e per unit (51.2V nominal, 16S1P), per BigBattery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e140A maximum continuous discharge\u003c\/strong\u003e — 7.6 kW maximum continuous power — with a 270A (1-second) peak, per BigBattery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e6,000+ cycle life\u003c\/strong\u003e, per BigBattery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelf-heating function\u003c\/strong\u003e and integrated aerosol fire suppression, per BigBattery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRS485 \/ RJ45 \/ CAN communications\u003c\/strong\u003e — compatible with all BigBattery APEX inverters and all EG4 inverters, per BigBattery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eParallels up to 15 units\u003c\/strong\u003e for up to 214.5 kWh, per BigBattery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIP54 protection rating\u003c\/strong\u003e, per BigBattery\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy BigBattery\u003c\/h2\u003e\n\u003cp\u003eBigBattery is a US company building LiFePO4 energy storage for off-grid, home backup, and industrial use. NEXUS batteries ship from Texas and are backed by BigBattery's 12-Year Limited Warranty and lifetime USA-based technical support, per BigBattery. Browse our full \u003ca href=\"\/collections\/bigbattery\"\u003eBigBattery collection\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSystem voltage\u003c\/td\u003e\n\u003ctd\u003e48V class (51.2V nominal)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCapacity\u003c\/td\u003e\n\u003ctd\u003e280Ah\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUsable energy\u003c\/td\u003e\n\u003ctd\u003e14.3 kWh, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChemistry\u003c\/td\u003e\n\u003ctd\u003eLiFePO4 (lithium iron phosphate), 16S1P\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax continuous discharge\u003c\/td\u003e\n\u003ctd\u003e140A (7.6 kW max continuous power)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak discharge\u003c\/td\u003e\n\u003ctd\u003e270A (1 second)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax charge current\u003c\/td\u003e\n\u003ctd\u003e140A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCycle life\u003c\/td\u003e\n\u003ctd\u003e6,000+ cycles, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunications\u003c\/td\u003e\n\u003ctd\u003eRS485 \/ RJ45 \/ CAN\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParallel capability\u003c\/td\u003e\n\u003ctd\u003eUp to 15 units (up to 214.5 kWh), per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProtection\u003c\/td\u003e\n\u003ctd\u003eBMS with voltage, current, and temperature protection; IP54 rating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThermal\u003c\/td\u003e\n\u003ctd\u003eSelf-heating function; integrated aerosol fire suppression\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCharge temperature\u003c\/td\u003e\n\u003ctd\u003e32°F to 113°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDischarge temperature\u003c\/td\u003e\n\u003ctd\u003e−4°F to 113°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions (W × H × D)\u003c\/td\u003e\n\u003ctd\u003e19.7 × 27.5 × 15.7 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003eApprox. 315 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e12-Year Limited Warranty, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eF-NXUS-48150-G1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eAll figures are BigBattery's published specifications. BigBattery markets the NEXUS in its 15 kWh class; the spec sheet lists usable energy of 14.3 kWh, and we quote the spec-sheet figure so you can size on the number you'll actually use.\u003c\/p\u003e\n\n\u003ch2\u003eBuilding a 48V Bank\u003c\/h2\u003e\n\u003cp\u003eTwo numbers drive bank design: continuous power and stored energy. On power, each NEXUS supports 140A of continuous discharge — about 7.6 kW — per BigBattery. A 6,000–6,500W inverter can run at its full rating on a single NEXUS; a 10,000–12,000W inverter needs at least two units in parallel before the battery side matches the inverter's continuous rating (two units, adding BigBattery's per-unit figures, support up to 280A, or about 15.2 kW).\u003c\/p\u003e\n\u003cp\u003eOn energy, work from daily consumption. Example assumptions — yours will differ: refrigerator 1.5 kWh\/day, chest freezer 1.0, LED lighting 0.4, well pump 1.0, electronics and internet 1.0. That is about 4.9 kWh\/day for an efficient cabin, so one NEXUS at 14.3 kWh usable (per BigBattery) covers roughly two such days without sun. A full-time household running laundry, kitchen appliances, and air conditioning can use 20–30 kWh\/day, which is where two or three units earn their keep. Up to 15 units parallel per BigBattery, so you can start with one and grow.\u003c\/p\u003e\n\n\u003ch2\u003eInstallation\u003c\/h2\u003e\n\u003cp\u003ePlan placement first: each cabinet weighs approximately 315 lb (per BigBattery), so the route into the building, floor loading, and a two-person or equipment-assisted move all matter. Install in a dry, conditioned space — the published charge range starts at 32°F, and while the pack includes a self-heating function, an insulated or heated utility area is the dependable answer for winter charging. All AC and DC wiring, overcurrent protection, grounding, and interconnection should be performed by a licensed electrician to the National Electrical Code (NEC) and local codes; most jurisdictions require a permit and inspection for energy storage.\u003c\/p\u003e\n\n\u003ch2\u003eWarranty \u0026amp; Support\u003c\/h2\u003e\n\u003cp\u003eThe NEXUS is covered by BigBattery's 12-Year Limited Warranty. In BigBattery's words: “BigBattery, Inc. guarantees that its products will be free from defects in material and workmanship for a period of twelve (12) years.” Per BigBattery, included accessories are covered for 1 year, and no warranty registration is needed — coverage is recorded automatically by serial number. BigBattery also publishes a 30-Day Money Back Guarantee; per BigBattery, non-defective returns are refunded at the purchase price minus a 20% restocking fee, and reimbursements do not include shipping costs.\u003c\/p\u003e\n\u003cp\u003eAll returns require a Return Merchandise Authorization (RMA) before anything ships back. OffGrid Horizon is a family-owned authorized BigBattery partner — call us at (302) 496-3554 and we will open the RMA or warranty claim with BigBattery and see it through with you. BigBattery backs its batteries with lifetime USA-based technical support.\u003c\/p\u003e\n\n\u003ch2\u003eShipping\u003c\/h2\u003e\n\u003cp\u003eThe NEXUS ships as palletized freight within the United States. When the carrier arrives, inspect the pallet and cabinet before signing: note any dents, punctures, or a tipped pallet on the delivery receipt, and contact us promptly if anything looks wrong — that notation keeps a freight claim straightforward.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eIs this battery really 15 kWh?\u003c\/h3\u003e\n\u003cp\u003eBigBattery markets the NEXUS in its 15 kWh class; the published spec sheet lists 280Ah and 14.3 kWh of usable energy. We quote the spec-sheet figure.\u003c\/p\u003e\n\u003ch3\u003eWhich inverters does it work with?\u003c\/h3\u003e\n\u003cp\u003ePer BigBattery, the NEXUS is compatible with all BigBattery APEX inverters and all EG4 inverters, communicating over RS485 \/ RJ45 \/ CAN. Pairing with another 48V inverter brand? Call us and we'll check before you order.\u003c\/p\u003e\n\u003ch3\u003eHow many units can I parallel?\u003c\/h3\u003e\n\u003cp\u003eUp to 15 in parallel, for up to 214.5 kWh, per BigBattery.\u003c\/p\u003e\n\u003ch3\u003eHow does it handle cold weather?\u003c\/h3\u003e\n\u003cp\u003eBigBattery lists discharge from −4°F to 113°F and charge from 32°F to 113°F, with a self-heating function built in. For year-round charging, install it in a space that stays above freezing.\u003c\/p\u003e\n\u003ch3\u003eDo I need to register the warranty?\u003c\/h3\u003e\n\u003cp\u003eNo. Per BigBattery, warranties are recorded automatically by serial number — keep your order confirmation as proof of purchase.\u003c\/p\u003e\n\u003ch3\u003eCan it be installed outdoors?\u003c\/h3\u003e\n\u003cp\u003eThe cabinet carries an IP54 protection rating per BigBattery, but temperature is the practical constraint — charging is specified from 32°F up. A garage, utility room, or insulated enclosure is the safer siting in most of the US.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003eSizing a bank or matching an inverter? Call OffGrid Horizon at (302) 496-3554 — we're a family-owned authorized BigBattery partner and glad to help you get it right.\u003c\/em\u003e\u003c\/p\u003e","brand":"BigBattery","offers":[{"title":"Default Title","offer_id":49082615300251,"sku":"F-NXUS-48150-G1","price":3375.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0746\/0614\/9787\/files\/109_dc1553a9-56c0-4006-9cc4-d9e56c1f1f14.png?v=1784902554"},{"product_id":"bigbattery-ethos-48v-stackable-lifepo4-battery-5-1-kwh-modules-ul1973-ul9540a","title":"BigBattery ETHOS 48V Stackable LiFePO4 Battery System | 15.36 kWh (3 × 5.12 kWh Modules) | UL1973 \/ UL9540A","description":"\u003cp\u003eThe BigBattery ETHOS is a stackable 48V LiFePO4 home battery system. This listing is BigBattery part K0950: a 15.36 kWh tower built from three 5.12 kWh ETHOS modules — 300Ah at 51.2V nominal in a 16S3P configuration, per BigBattery's ETHOS spec sheet. Per BigBattery, ETHOS carries UL9540, UL9540A, UL1973, and UN38.3 certifications, communicates over CAN bus\/RS485, and supports closed-loop communication with compatible EG4 inverters. It is the same battery platform used across our \u003ca href=\"\/collections\/bigbattery\"\u003eBigBattery ETHOS kits\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eWho This System Is For\u003c\/h2\u003e\n\u003cp\u003eHomeowners adding storage to a new or existing 48V solar installation, and anyone building backup power where the permitting office asks for UL-listed equipment. The vertical tower keeps the footprint to roughly 26.5 inches wide by 6.7 inches deep, and capacity grows in 5.12 kWh steps, so it fits essential-circuit backup today with room to expand later. Pair it with a hybrid inverter such as the \u003ca href=\"\/products\/eg4-18kpv-all-in-one-hybrid-solar-inverter-18-kw-pv-12-kw-ac-split-phase\"\u003eEG4 18kPV\u003c\/a\u003e for grid-tied service, or with EG4's XP-series inverters for off-grid systems — see our \u003ca href=\"\/collections\/eg4\"\u003eEG4 collection\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e15.36 kWh of LiFePO4 storage\u003c\/strong\u003e — three stacked 5.12 kWh \/ 100Ah modules (16S3P), per BigBattery's ETHOS spec sheet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCertified for residential energy storage:\u003c\/strong\u003e UL9540, UL9540A, UL1973, and UN38.3, per BigBattery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e250A maximum continuous discharge (12,800W)\u003c\/strong\u003e and 200A maximum charge current for this three-module configuration, per BigBattery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStackable and expandable\u003c\/strong\u003e — per BigBattery, up to 16 parallel connections per control box, so capacity can grow in 5.12 kWh steps\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClosed-loop communication\u003c\/strong\u003e with compatible EG4 inverters over CAN bus\/RS485, per BigBattery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3,500–5,000 cycle life\u003c\/strong\u003e at 80% depth of discharge, 0.5C, per BigBattery's spec sheet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIP65-rated module enclosures\u003c\/strong\u003e with a battery management system (BMS) in every module\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy BigBattery\u003c\/h2\u003e\n\u003cp\u003eBigBattery is a US-based energy storage company that has been building lithium battery systems since 2011 and, per BigBattery, is trusted by more than 50,000 Americans. BigBattery states its products are designed and engineered in Texas, and every BigBattery product includes free lifetime tech support and troubleshooting from its US-based team. The company backs its batteries with a 12-Year Limited Warranty, which BigBattery describes as \"the longest warranty in the battery industry.\" OffGrid Horizon is a family-owned authorized BigBattery partner.\u003c\/p\u003e\n\n\u003ch2\u003eWhat's In the Kit\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e3 × BigBattery ETHOS 48V 5.12 kWh LiFePO4 modules, assembled as one 15.36 kWh stacked tower\u003c\/li\u003e\n\u003cli\u003eIntegrated BMS in each module with CAN bus\/RS485 communication\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eBigBattery lists ETHOS inverter connectors and battery-to-battery connectors as separate accessories, and base\/control-box hardware varies by configuration — please call (302) 496-3554 to confirm the exact accessories included with your order.\u003c\/p\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eK0950\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChemistry\u003c\/td\u003e\n\u003ctd\u003eLiFePO4 (lithium iron phosphate)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal voltage\u003c\/td\u003e\n\u003ctd\u003e51.2V (48V-class system)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCapacity\u003c\/td\u003e\n\u003ctd\u003e15.36 kWh \/ 300Ah (3 × 5.12 kWh \/ 100Ah modules, 16S3P)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax continuous discharge\u003c\/td\u003e\n\u003ctd\u003e250A (12,800W), per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak discharge\u003c\/td\u003e\n\u003ctd\u003e300A, max 5 seconds, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax charge current\u003c\/td\u003e\n\u003ctd\u003e200A; charge voltage 55.6–57V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunications\u003c\/td\u003e\n\u003ctd\u003eCAN bus \/ RS485; closed-loop with compatible EG4 inverters, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCharge temperature\u003c\/td\u003e\n\u003ctd\u003e32°F to 113°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDischarge temperature\u003c\/td\u003e\n\u003ctd\u003e-4°F to 140°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions (3-module tower)\u003c\/td\u003e\n\u003ctd\u003e26.5\" W × 6.7\" D × 59.8\" H, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight (3-module tower)\u003c\/td\u003e\n\u003ctd\u003e387 lb, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnclosure\u003c\/td\u003e\n\u003ctd\u003eIP65\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCycle life\u003c\/td\u003e\n\u003ctd\u003e3,500–5,000 cycles (80% DoD, 0.5C), per BigBattery's spec sheet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCertifications\u003c\/td\u003e\n\u003ctd\u003eUL9540, UL9540A, UL1973, UN38.3, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExpandability\u003c\/td\u003e\n\u003ctd\u003eUp to 16 parallel connections per control box, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003eBigBattery 12-Year Limited Warranty (accessories 1 year)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eGrid-Tied, Off-Grid, or Backup?\u003c\/h2\u003e\n\u003cp\u003eETHOS is the battery — system capability comes from the inverter you pair with it. Per BigBattery, ETHOS is compatible with grid-tied UL9540 configurations built on the EG4 18kPV, FlexBOSS18, and FlexBOSS21 hybrid inverters (grid export is subject to utility interconnection approval), and with off-grid inverters including the EG4 6000XP and 12000XP. With a hybrid inverter, ETHOS can back up selected circuits or, with sufficient inverter output and load management, larger portions of a home — actual coverage depends on your loads.\u003c\/p\u003e\n\n\u003ch2\u003eInstallation\u003c\/h2\u003e\n\u003cp\u003eModule stacking and placement are straightforward, but all DC and AC wiring — inverter connection, panel interconnection, grounding, bonding, and overcurrent protection — must be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and local amendments. Residential energy storage installations typically require a permit and inspection, and grid-tied systems require an approved interconnection agreement with your utility before exporting power. Your installer should verify conductor sizing, disconnects, and clearances against current NEC requirements for energy storage systems.\u003c\/p\u003e\n\n\u003ch2\u003eWarranty \u0026amp; Support\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eBigBattery 12-Year Limited Warranty.\u003c\/strong\u003e Per BigBattery: \"If any covered component within your battery fails due to a defect in materials or workmanship within the 12-year warranty period, we will repair or replace the battery at our cost.\" Included accessories such as cables and connectors carry a 1-year warranty per BigBattery, and BigBattery provides free lifetime tech support and troubleshooting for all BigBattery products.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eReturns and warranty claims require an RMA.\u003c\/strong\u003e Please contact us before shipping anything back — all returns must be authorized with a Return Merchandise Authorization first. OffGrid Horizon is a family-owned authorized BigBattery partner: call (302) 496-3554 and we will help open the claim and coordinate service with BigBattery.\u003c\/p\u003e\n\n\u003ch2\u003eShipping\u003c\/h2\u003e\n\u003cp\u003eThis system ships as palletized LTL freight within the continental United States; curbside liftgate delivery is standard for residential addresses. The three-module tower weighs 387 lb, so plan for help moving it into place. Before signing the delivery receipt, count the pieces and inspect the packaging — note any visible damage or shortage on the receipt with the driver and contact us right away so we can open a freight claim. Per BigBattery, standard domestic orders are projected to take 7–12 days to deliver.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eCan I expand this system later?\u003c\/h3\u003e\n\u003cp\u003eYes. ETHOS is a stacking platform — per BigBattery, up to 16 parallel connections per control box — so you can add 5.12 kWh modules as your needs grow instead of buying maximum capacity up front.\u003c\/p\u003e\n\u003ch3\u003eWhich inverters work with ETHOS?\u003c\/h3\u003e\n\u003cp\u003ePer BigBattery: the EG4 18kPV, FlexBOSS18, and FlexBOSS21 for grid-tied UL9540 configurations, and off-grid inverters including the EG4 6000XP and 12000XP. Closed-loop communication is supported with compatible EG4 models.\u003c\/p\u003e\n\u003ch3\u003eWill it charge in cold weather?\u003c\/h3\u003e\n\u003cp\u003ePer BigBattery's spec sheet, the charge temperature range is 32°F to 113°F and discharge is rated to -4°F. The BMS restricts charging below freezing to protect the cells, so install the tower in an insulated or conditioned space if winters are cold.\u003c\/p\u003e\n\u003ch3\u003eIs 15.36 kWh enough to back up my whole house?\u003c\/h3\u003e\n\u003cp\u003eThat depends on your loads. 15.36 kWh typically carries refrigeration, lighting, electronics, and other essentials through an evening or overnight outage; whole-home coverage depends on which circuits you back up, your inverter's output rating, and how long the outage lasts.\u003c\/p\u003e\n\u003ch3\u003eDo the UL listings matter for permitting?\u003c\/h3\u003e\n\u003cp\u003eMany building departments request UL1973 and UL9540A documentation when permitting residential energy storage. Per BigBattery, ETHOS carries UL9540, UL9540A, UL1973, and UN38.3.\u003c\/p\u003e\n\u003ch3\u003eWhat if I need warranty service?\u003c\/h3\u003e\n\u003cp\u003eContact us first — warranty claims and returns require an RMA, and we will help you open a claim ticket with BigBattery and coordinate next steps.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003eQuestions about sizing, inverter pairing, or expansion? Call OffGrid Horizon at (302) 496-3554 — we're a family-owned authorized BigBattery partner and happy to help you spec it right.\u003c\/em\u003e\u003c\/p\u003e","brand":"BigBattery","offers":[{"title":"Default Title","offer_id":49082615595163,"sku":"K0950","price":4620.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0746\/0614\/9787\/files\/ETHOS-3stack-carousel.png?v=1784902567"},{"product_id":"bigbattery-nexus-apex-6-5k-off-grid-kit-15-kwh-48v-lifepo4","title":"BigBattery NEXUS + APEX 6.5K Off-Grid Kit | 15 kWh | 48V LiFePO4","description":"\u003cp\u003eThis kit pairs one BigBattery NEXUS 48V LiFePO4 battery — 280Ah, 14.3 kWh usable per BigBattery — with the APEX 6.5K all-in-one inverter: 6,500W of continuous split-phase 120\/240V output, two MPPT solar inputs rated 5,000W + 5,000W, and built-in battery charging from grid or generator, per BigBattery. BigBattery sells this as an off-grid and backup power system — it runs your loads from battery, solar, or an AC charging source, and it is not sold as a grid-interactive (sell-back) system.\u003c\/p\u003e\n\n\u003ch2\u003eWho This Is For\u003c\/h2\u003e\n\u003cp\u003eCabins, guest houses, seasonal properties, workshops, and defined backup circuits — refrigeration, lighting, pumps, electronics, and 240V appliances at moderate scale. It fits owners whose daily energy use is modest today and who want a single battery cabinet with a clear path to more storage later. If your concern is peak power — large motor starts, several 240V loads at once — look at the APEX 10K version of this kit instead.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e6,500W continuous split-phase 120\/240V output\u003c\/strong\u003e, 13,000VA maximum output, per BigBattery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwo MPPT solar inputs, 5,000W + 5,000W\u003c\/strong\u003e (125–450Vdc MPPT range, 18A + 18A), per BigBattery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwo AC inputs (grid and generator)\u003c\/strong\u003e — up to 80A grid\/generator charging and up to 140A solar charging, per BigBattery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNEXUS battery: 280Ah, 14.3 kWh usable, 6,000+ cycle life\u003c\/strong\u003e, self-heating function, aerosol fire suppression, per BigBattery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRoom to grow:\u003c\/strong\u003e NEXUS parallels up to 15 units and the APEX 6.5K parallels up to 6 units, per BigBattery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInverter certifications:\u003c\/strong\u003e UL1741 \/ RoHS \/ EN61000-6-1 \/ EC61000-6-3 \/ FCC Part 15 Class B, per BigBattery\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy BigBattery\u003c\/h2\u003e\n\u003cp\u003eBigBattery is a US company building LiFePO4 energy storage for off-grid and home backup use; the APEX line is BigBattery's own inverter family, so battery and inverter come from one manufacturer. Kits ship from Texas and are backed by lifetime USA-based technical support, per BigBattery. See our full \u003ca href=\"\/collections\/bigbattery\"\u003eBigBattery collection\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eWhat's In the Kit\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1 × \u003ca href=\"\/products\/bigbattery-nexus-48v-lifepo4-battery-15-kwh\"\u003eBigBattery NEXUS 48V LiFePO4 battery\u003c\/a\u003e — 280Ah, 14.3 kWh usable per BigBattery\u003c\/li\u003e\n\u003cli\u003e1 × \u003ca href=\"\/products\/apex-6-5k-off-grid-inverter-6-5-kw-48v-split-phase\"\u003eAPEX 6.5K off-grid inverter\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eSolar panels, racking, and array wiring are not included — arrays are sized to your site. BigBattery's kit listing does not itemize cables or accessories, so call us at (302) 496-3554 before ordering and we'll confirm exactly what ships with your configuration.\u003c\/p\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery\u003c\/td\u003e\n\u003ctd\u003e1 × BigBattery NEXUS, 48V class (51.2V nominal), LiFePO4, 280Ah\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUsable energy\u003c\/td\u003e\n\u003ctd\u003e14.3 kWh, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery max continuous discharge\u003c\/td\u003e\n\u003ctd\u003e140A (7.6 kW max continuous power), per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery cycle life\u003c\/td\u003e\n\u003ctd\u003e6,000+ cycles, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery communications\u003c\/td\u003e\n\u003ctd\u003eRS485 \/ RJ45 \/ CAN\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery dimensions \/ weight\u003c\/td\u003e\n\u003ctd\u003e19.7 × 27.5 × 15.7 in; approx. 315 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInverter\u003c\/td\u003e\n\u003ctd\u003eAPEX 6.5K — 6,500W rated output, 13,000VA maximum, split-phase 120\/240Vac\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSolar input\u003c\/td\u003e\n\u003ctd\u003eTwo MPPTs, 5,000W + 5,000W; 125–450Vdc MPPT range; 18A + 18A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCharging\u003c\/td\u003e\n\u003ctd\u003eUp to 140A from solar; up to 80A from grid\/generator; two AC inputs (grid \u0026amp; generator)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery voltage range (inverter)\u003c\/td\u003e\n\u003ctd\u003e40–60Vdc\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInverter parallel capability\u003c\/td\u003e\n\u003ctd\u003eUp to 6 units, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInverter certifications\u003c\/td\u003e\n\u003ctd\u003eUL1741 \/ RoHS \/ EN61000-6-1 \/ EC61000-6-3 \/ FCC Part 15 Class B, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInverter dimensions \/ weight\u003c\/td\u003e\n\u003ctd\u003e25.51 × 16.14 × 5.51 in; 48 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery warranty\u003c\/td\u003e\n\u003ctd\u003e12-Year Limited Warranty, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInverter warranty\u003c\/td\u003e\n\u003ctd\u003e5-Year Limited Warranty, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eKit SKU\u003c\/td\u003e\n\u003ctd\u003eK0191\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eSizing Your Off-Grid Home\u003c\/h2\u003e\n\u003cp\u003eStart with energy. Example assumptions — label and adjust for your own loads: refrigerator 1.5 kWh\/day, chest freezer 1.0, LED lighting 0.4, well pump 1.0, electronics and internet 1.0, washer 0.5. That totals about 5.4 kWh\/day, so 14.3 kWh usable (per BigBattery) covers roughly two such days without sun. Add a mini-split (commonly 5–15 kWh\/day in season, depending on size and climate) or electric water heating and you move to cycling the bank daily — that is what the 30–45 kWh version of this kit is for.\u003c\/p\u003e\n\u003cp\u003eThen check power. 6,500W continuous covers a cabin-scale panel — and the battery keeps up: one NEXUS supports up to 140A, about 7.6 kW continuous, per BigBattery, so a single battery can carry this inverter at full rated output.\u003c\/p\u003e\n\n\u003ch2\u003eInstallation\u003c\/h2\u003e\n\u003cp\u003eSetting the 315 lb battery cabinet and wall-mounting the 48 lb inverter are the easy parts. The AC side — panel interconnection, overcurrent protection, grounding, bonding — belongs to a licensed electrician working to the National Electrical Code (NEC) and local codes, and most jurisdictions require a permit and inspection for energy storage. Place the battery in a dry space kept above freezing; BigBattery's published charge range starts at 32°F.\u003c\/p\u003e\n\n\u003ch2\u003eWarranty \u0026amp; Support\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eBattery:\u003c\/strong\u003e covered by BigBattery's 12-Year Limited Warranty — in BigBattery's words, “BigBattery, Inc. guarantees that its products will be free from defects in material and workmanship for a period of twelve (12) years.” Included accessories are covered for 1 year, and no registration is needed, per BigBattery. \u003cstrong\u003eInverter:\u003c\/strong\u003e the APEX 6.5K is covered by a 5-Year Limited Warranty, per BigBattery.\u003c\/p\u003e\n\u003cp\u003eBigBattery publishes a 30-Day Money Back Guarantee; per BigBattery, non-defective returns are refunded at purchase price minus a 20% restocking fee, excluding shipping. All returns require a Return Merchandise Authorization (RMA) before anything ships back — call OffGrid Horizon at (302) 496-3554 and we'll open the RMA or warranty claim with BigBattery. We're a family-owned authorized BigBattery partner, and BigBattery backs the system with lifetime USA-based technical support.\u003c\/p\u003e\n\n\u003ch2\u003eShipping\u003c\/h2\u003e\n\u003cp\u003eThis kit ships as palletized freight within the United States. Inspect the pallet before signing: note any damage on the delivery receipt and contact us promptly — that notation keeps a freight claim simple.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eIs this a grid-tie system?\u003c\/h3\u003e\n\u003cp\u003eNo. BigBattery sells it for off-grid and backup power applications. The APEX 6.5K's two AC inputs accept grid or generator power for battery charging, per BigBattery, but the system is not sold as a grid-interactive (sell-back) inverter.\u003c\/p\u003e\n\u003ch3\u003eAre solar panels included?\u003c\/h3\u003e\n\u003cp\u003eNo. The two MPPT inputs accept up to 5,000W + 5,000W of PV per BigBattery; panels and racking are sized to your site and sold separately. The system can also run on battery plus grid\/generator charging without solar.\u003c\/p\u003e\n\u003ch3\u003eCan I add more storage later?\u003c\/h3\u003e\n\u003cp\u003eYes — NEXUS batteries parallel up to 15 units, per BigBattery. The 2- and 3-battery versions of this kit are listed separately if you already know you need more.\u003c\/p\u003e\n\u003ch3\u003eWill it start motors and 240V equipment?\u003c\/h3\u003e\n\u003cp\u003eBigBattery rates the APEX 6.5K at 13,000VA maximum output for short-duration demands above its 6,500W continuous rating. For a specific well pump, compressor, or shop tool, call us with the nameplate figures and we'll talk it through.\u003c\/p\u003e\n\u003ch3\u003eDo I need an electrician?\u003c\/h3\u003e\n\u003cp\u003eYes — the AC interconnection, grounding, and code compliance are work for a licensed electrician, and most jurisdictions require a permit and inspection.\u003c\/p\u003e\n\u003ch3\u003eHow does the battery handle cold weather?\u003c\/h3\u003e\n\u003cp\u003ePer BigBattery, the NEXUS discharges from −4°F to 113°F and charges from 32°F to 113°F, with a self-heating function. Install it in a space that stays above freezing for dependable winter charging.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003eNot sure between the 6.5K and the 10K? Call OffGrid Horizon at (302) 496-3554 — we're a family-owned authorized BigBattery partner and we'll size it with you honestly.\u003c\/em\u003e\u003c\/p\u003e","brand":"BigBattery","offers":[{"title":"1 × NEXUS — 15 kWh","offer_id":49148513190043,"sku":"K0191","price":4535.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0746\/0614\/9787\/files\/Nexus-Apex-6.5K-Default-scaled-2.webp?v=1785535391"},{"product_id":"bigbattery-nexus-apex-10k-off-grid-kit-15-kwh-48v-lifepo4","title":"BigBattery NEXUS + APEX 10K Off-Grid Kit | 15 kWh | 48V LiFePO4","description":"\u003cp\u003eThis kit pairs one BigBattery NEXUS 48V LiFePO4 battery — 280Ah, 14.3 kWh usable per BigBattery — with the APEX 10K all-in-one inverter: 10,000W of continuous split-phase 120\/240V output with 20,000VA maximum, two MPPT solar inputs rated 5,000W + 5,500W, and built-in charging from grid or generator, per BigBattery. BigBattery sells this as an off-grid and backup power system — it is not sold as a grid-interactive (sell-back) system — and per BigBattery it offers UPS backup capability with 15–30ms transfer.\u003c\/p\u003e\n\n\u003ch2\u003eWho This Is For\u003c\/h2\u003e\n\u003cp\u003eHomesteads, workshops, and properties whose challenge is peak power rather than daily energy — starting large motors, running a welder or compressor, or carrying several 240V circuits at once — while keeping storage at a single-cabinet starting point. If your loads are cabin-scale, the APEX 6.5K version of this kit does the same job with a smaller inverter; if you cycle the bank hard every day, see the 30–45 kWh version.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e10,000W continuous split-phase 120\/240V output\u003c\/strong\u003e, 20,000VA maximum output, per BigBattery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwo MPPT solar inputs, 5,000W + 5,500W\u003c\/strong\u003e (125–450Vdc MPPT range, 22A + 22A, 550Vdc max open-circuit), per BigBattery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUp to 200A solar charging and up to 120A grid\/generator charging\u003c\/strong\u003e; one AC input (grid or generator), per BigBattery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPS backup capability (15–30ms)\u003c\/strong\u003e, per BigBattery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNEXUS battery: 280Ah, 14.3 kWh usable, 6,000+ cycle life\u003c\/strong\u003e, self-heating function, aerosol fire suppression, per BigBattery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRoom to grow:\u003c\/strong\u003e NEXUS parallels up to 15 units and the APEX 10K parallels up to 6 units, per BigBattery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInverter certifications:\u003c\/strong\u003e UL1741 \/ RoHS \/ EN61000-6-1 \/ EC61000-6-3 \/ FCC Part 15 Class B \/ IEC62109-1 \/ IEC62109-2, per BigBattery\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy BigBattery\u003c\/h2\u003e\n\u003cp\u003eBigBattery is a US company building LiFePO4 energy storage for off-grid and home backup use; the APEX line is BigBattery's own inverter family, so battery and inverter come from one manufacturer. Kits ship from Texas and are backed by lifetime USA-based technical support, per BigBattery. See our full \u003ca href=\"\/collections\/bigbattery\"\u003eBigBattery collection\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eWhat's In the Kit\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1 × \u003ca href=\"\/products\/bigbattery-nexus-48v-lifepo4-battery-15-kwh\"\u003eBigBattery NEXUS 48V LiFePO4 battery\u003c\/a\u003e — 280Ah, 14.3 kWh usable per BigBattery\u003c\/li\u003e\n\u003cli\u003e1 × \u003ca href=\"\/products\/apex-10k-off-grid-inverter-10-kw-48v-split-phase\"\u003eAPEX 10K off-grid inverter\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eSolar panels, racking, and array wiring are not included. BigBattery's kit listing does not itemize cables or accessories, so call us at (302) 496-3554 before ordering and we'll confirm exactly what ships with your configuration.\u003c\/p\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery\u003c\/td\u003e\n\u003ctd\u003e1 × BigBattery NEXUS, 48V class (51.2V nominal), LiFePO4, 280Ah\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUsable energy\u003c\/td\u003e\n\u003ctd\u003e14.3 kWh, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery max continuous discharge\u003c\/td\u003e\n\u003ctd\u003e140A (7.6 kW max continuous power), per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery cycle life\u003c\/td\u003e\n\u003ctd\u003e6,000+ cycles, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery communications\u003c\/td\u003e\n\u003ctd\u003eRS485 \/ RJ45 \/ CAN\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery dimensions \/ weight\u003c\/td\u003e\n\u003ctd\u003e19.7 × 27.5 × 15.7 in; approx. 315 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInverter\u003c\/td\u003e\n\u003ctd\u003eAPEX 10K — 10,000W rated output, 20,000VA maximum, split-phase 120\/240Vac\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSolar input\u003c\/td\u003e\n\u003ctd\u003eTwo MPPTs, 5,000W + 5,500W; 125–450Vdc MPPT range; 22A + 22A; 550Vdc max open-circuit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCharging\u003c\/td\u003e\n\u003ctd\u003eUp to 200A from solar; up to 120A from grid\/generator; one AC input (grid or generator)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery voltage range (inverter)\u003c\/td\u003e\n\u003ctd\u003e40–60Vdc\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInverter parallel capability\u003c\/td\u003e\n\u003ctd\u003eUp to 6 units, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInverter certifications\u003c\/td\u003e\n\u003ctd\u003eUL1741 \/ RoHS \/ EN61000-6-1 \/ EC61000-6-3 \/ FCC Part 15 Class B \/ IEC62109-1 \/ IEC62109-2, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInverter dimensions \/ weight\u003c\/td\u003e\n\u003ctd\u003e28.46 × 17.64 × 5.91 in; 62 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery warranty\u003c\/td\u003e\n\u003ctd\u003e12-Year Limited Warranty, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInverter warranty\u003c\/td\u003e\n\u003ctd\u003e5-Year Limited Warranty, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eKit SKU\u003c\/td\u003e\n\u003ctd\u003eK0196\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eSizing Your Off-Grid Home\u003c\/h2\u003e\n\u003cp\u003eOne honest number up front: with a single battery, the NEXUS supports up to 140A — about 7.6 kW — of continuous discharge, per BigBattery. That means this one-battery kit will not sustain the inverter's full 10,000W continuously from battery alone; sustained draws at that level call for a second NEXUS (two units, adding BigBattery's per-unit figures, support about 15.2 kW). Where this configuration shines is high peak, moderate daily energy: big motor starts and short heavy draws, with typical loads well under the battery's continuous limit.\u003c\/p\u003e\n\u003cp\u003eOn energy, example assumptions — adjust to your site: refrigerator 1.5 kWh\/day, freezer 1.0, lighting 0.4, well pump 1.0, electronics 1.0, workshop tools in bursts 1.5. About 6.4 kWh\/day, so 14.3 kWh usable (per BigBattery) is roughly two days of autonomy without sun. Daily heavy cycling or long overcast stretches point to the 30–45 kWh version of this kit.\u003c\/p\u003e\n\n\u003ch2\u003eInstallation\u003c\/h2\u003e\n\u003cp\u003eSetting the 315 lb battery cabinet and wall-mounting the 62 lb inverter are the straightforward parts. The AC side — panel interconnection, overcurrent protection, grounding, bonding — belongs to a licensed electrician working to the National Electrical Code (NEC) and local codes; most jurisdictions require a permit and inspection for energy storage. Place the battery in a dry space kept above freezing; BigBattery's published charge range starts at 32°F.\u003c\/p\u003e\n\n\u003ch2\u003eWarranty \u0026amp; Support\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eBattery:\u003c\/strong\u003e covered by BigBattery's 12-Year Limited Warranty — in BigBattery's words, “BigBattery, Inc. guarantees that its products will be free from defects in material and workmanship for a period of twelve (12) years.” Included accessories are covered for 1 year, and no registration is needed, per BigBattery. \u003cstrong\u003eInverter:\u003c\/strong\u003e the APEX 10K is covered by a 5-Year Limited Warranty, per BigBattery.\u003c\/p\u003e\n\u003cp\u003eBigBattery publishes a 30-Day Money Back Guarantee; per BigBattery, non-defective returns are refunded at purchase price minus a 20% restocking fee, excluding shipping. All returns require a Return Merchandise Authorization (RMA) before anything ships back — call OffGrid Horizon at (302) 496-3554 and we'll open the RMA or warranty claim with BigBattery. We're a family-owned authorized BigBattery partner, and BigBattery backs the system with lifetime USA-based technical support.\u003c\/p\u003e\n\n\u003ch2\u003eShipping\u003c\/h2\u003e\n\u003cp\u003eThis kit ships as palletized freight within the United States. Inspect the pallet before signing: note any damage on the delivery receipt and contact us promptly — that notation keeps a freight claim simple.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eWhy pair a 10,000W inverter with one battery?\u003c\/h3\u003e\n\u003cp\u003ePeak power and stored energy are separate questions. If you need high wattage in bursts but your daily consumption is modest, this is the right shape — and the battery bank can grow to 15 units later, per BigBattery. For sustained loads above about 7.6 kW, plan on a second NEXUS from the start.\u003c\/p\u003e\n\u003ch3\u003eIs this a grid-tie system?\u003c\/h3\u003e\n\u003cp\u003eNo. BigBattery sells it for off-grid and backup power applications. The single AC input accepts grid or generator power for charging, per BigBattery, but the system is not sold as a grid-interactive (sell-back) inverter.\u003c\/p\u003e\n\u003ch3\u003eAre solar panels included?\u003c\/h3\u003e\n\u003cp\u003eNo. The two MPPTs accept up to 5,000W + 5,500W of PV per BigBattery; panels and racking are sized to your site and sold separately.\u003c\/p\u003e\n\u003ch3\u003eCan I add more storage later?\u003c\/h3\u003e\n\u003cp\u003eYes — NEXUS batteries parallel up to 15 units, per BigBattery. The 2- and 3-battery versions of this kit are listed separately.\u003c\/p\u003e\n\u003ch3\u003eDo I need an electrician?\u003c\/h3\u003e\n\u003cp\u003eYes — AC interconnection, grounding, and code compliance are work for a licensed electrician, and most jurisdictions require a permit and inspection.\u003c\/p\u003e\n\u003ch3\u003eHow does the battery handle cold weather?\u003c\/h3\u003e\n\u003cp\u003ePer BigBattery, the NEXUS discharges from −4°F to 113°F and charges from 32°F to 113°F, with a self-heating function. Keep it in a space that stays above freezing.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003eWondering whether one battery is enough for a 10K inverter? Call OffGrid Horizon at (302) 496-3554 — we're a family-owned authorized BigBattery partner and we'll walk the math with you.\u003c\/em\u003e\u003c\/p\u003e","brand":"BigBattery","offers":[{"title":"1 × NEXUS — 15 kWh","offer_id":49148532392091,"sku":"K0196","price":4725.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0746\/0614\/9787\/files\/Nexus-Apex-10K-scaled-2.webp?v=1785535419"},{"product_id":"bigbattery-nexus-eg4-6000xp-off-grid-kit-15-kwh-48v-lifepo4","title":"BigBattery NEXUS + EG4 6000XP Off-Grid Kit | 15 kWh | 48V LiFePO4","description":"\u003cp\u003eThis kit pairs one BigBattery NEXUS 48V LiFePO4 battery — 280Ah, 14.3 kWh usable per BigBattery — with the EG4 6000XP all-in-one off-grid inverter: 6,000W of continuous split-phase 120\/240V output with dual MPPTs accepting up to 8,000W of PV, per EG4. It is an off-grid system: per BigBattery, the pairing is sold for home backup and full off-grid operation, and per BigBattery the NEXUS is compatible with all EG4 inverters over its RS485 \/ RJ45 \/ CAN communications.\u003c\/p\u003e\n\n\u003ch2\u003eWho This Is For\u003c\/h2\u003e\n\u003cp\u003eCabins, tiny homes, small off-grid households, and essential-circuit backup — refrigeration, lights, electronics, a water pump, and a moderate 240V load. It suits owners who want EG4's widely installed XP-series inverter platform on a large single-cabinet battery. If you run central air, a well pump plus large appliances simultaneously, or a full-size home, step up to the EG4 12000XP V2 version of this kit.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e6,000W continuous split-phase 120\/240V output\u003c\/strong\u003e, per EG4; surge rated 12,000W (3.5 seconds), per BigBattery's kit listing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUp to 8,000W of PV input\u003c\/strong\u003e — 4,000W per MPPT across dual MPPTs, with high 480Vdc input, per EG4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUL 1741 Certified\u003c\/strong\u003e transformerless design with idle consumption as low as 30W with PV, per EG4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eParallels up to 16 inverters\u003c\/strong\u003e for up to 96 kW combined output, per EG4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNEXUS battery: 280Ah, 14.3 kWh usable, 6,000+ cycle life\u003c\/strong\u003e, self-heating function, aerosol fire suppression, per BigBattery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBattery parallels up to 15 units\u003c\/strong\u003e (up to 214.5 kWh), per BigBattery\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy BigBattery\u003c\/h2\u003e\n\u003cp\u003eBigBattery is a US company building LiFePO4 energy storage for off-grid and home backup use. NEXUS batteries ship from Texas, carry a 12-Year Limited Warranty, and are backed by lifetime USA-based technical support, per BigBattery — here matched with EG4's popular 6000XP inverter. Browse our \u003ca href=\"\/collections\/eg4\"\u003eEG4 collection\u003c\/a\u003e for the rest of the line.\u003c\/p\u003e\n\n\u003ch2\u003eWhat's In the Kit\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1 × \u003ca href=\"\/products\/bigbattery-nexus-48v-lifepo4-battery-15-kwh\"\u003eBigBattery NEXUS 48V LiFePO4 battery\u003c\/a\u003e — 280Ah, 14.3 kWh usable per BigBattery\u003c\/li\u003e\n\u003cli\u003e1 × \u003ca href=\"\/products\/eg4-6000xp-off-grid-inverter-6-kw-output-8-kw-pv-input-split-phase\"\u003eEG4 6000XP off-grid inverter\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eSolar panels, racking, and array wiring are not included. BigBattery's kit listing does not itemize cables or accessories, so call us at (302) 496-3554 before ordering and we'll confirm exactly what ships with your configuration.\u003c\/p\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery\u003c\/td\u003e\n\u003ctd\u003e1 × BigBattery NEXUS, 48V class (51.2V nominal), LiFePO4, 280Ah\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUsable energy\u003c\/td\u003e\n\u003ctd\u003e14.3 kWh, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery max continuous discharge\u003c\/td\u003e\n\u003ctd\u003e140A (7.6 kW max continuous power), per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery cycle life\u003c\/td\u003e\n\u003ctd\u003e6,000+ cycles, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery communications\u003c\/td\u003e\n\u003ctd\u003eRS485 \/ RJ45 \/ CAN; compatible with all EG4 inverters, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery dimensions \/ weight\u003c\/td\u003e\n\u003ctd\u003e19.7 × 27.5 × 15.7 in; approx. 315 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInverter\u003c\/td\u003e\n\u003ctd\u003eEG4 6000XP — 6,000W continuous, split-phase 120\/240V, per EG4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurge\u003c\/td\u003e\n\u003ctd\u003e12,000W (3.5 s), per BigBattery's kit listing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSolar input\u003c\/td\u003e\n\u003ctd\u003eUp to 8,000W (4,000W per MPPT), dual MPPTs, high 480Vdc input, per EG4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInverter parallel capability\u003c\/td\u003e\n\u003ctd\u003eUp to 16 units (96 kW combined), per EG4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInverter certifications\u003c\/td\u003e\n\u003ctd\u003eUL 1741 Certified, per EG4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery warranty\u003c\/td\u003e\n\u003ctd\u003e12-Year Limited Warranty, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInverter warranty\u003c\/td\u003e\n\u003ctd\u003e5-year full parts replacement or full product replacement warranty, per EG4 (registration or authorized-distributor proof of purchase required — see below)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eKit SKU\u003c\/td\u003e\n\u003ctd\u003eK0152\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eSizing Your Off-Grid Home\u003c\/h2\u003e\n\u003cp\u003eStart with energy. Example assumptions — adjust for your own loads: refrigerator 1.5 kWh\/day, chest freezer 1.0, LED lighting 0.4, well pump 1.0, electronics and internet 1.0, washer 0.5. That is about 5.4 kWh\/day, so 14.3 kWh usable (per BigBattery) covers roughly two such days without sun. A mini-split adds roughly 5–15 kWh\/day in season depending on size and climate — if that is in your plan, look at the 30–45 kWh version of this kit.\u003c\/p\u003e\n\u003cp\u003eThen power: 6,000W continuous covers most small-household essential panels, and one NEXUS supports up to 140A — about 7.6 kW — of continuous discharge per BigBattery, so the battery carries this inverter at full rated output. On the solar side, 8,000W of PV (per EG4) in reasonable US sun can put well over 20 kWh\/day back into a 14.3 kWh bank — recharge is rarely the bottleneck at this scale.\u003c\/p\u003e\n\n\u003ch2\u003eInstallation\u003c\/h2\u003e\n\u003cp\u003eSetting the 315 lb battery cabinet and wall-mounting the inverter are the straightforward parts. The AC side — panel interconnection, overcurrent protection, grounding, bonding — belongs to a licensed electrician working to the National Electrical Code (NEC) and local codes; most jurisdictions require a permit and inspection for energy storage. Place the battery in a dry space kept above freezing; BigBattery's published charge range starts at 32°F.\u003c\/p\u003e\n\n\u003ch2\u003eWarranty \u0026amp; Support\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eBattery:\u003c\/strong\u003e covered by BigBattery's 12-Year Limited Warranty — in BigBattery's words, “BigBattery, Inc. guarantees that its products will be free from defects in material and workmanship for a period of twelve (12) years.” No registration needed, per BigBattery. \u003cstrong\u003eInverter:\u003c\/strong\u003e the EG4 6000XP carries a 5-year full parts replacement or full product replacement warranty, per EG4, which states the warranty “must be registered within the first year of purchase or provide proof of purchase from an EG4 authorized distributor to remain valid.”\u003c\/p\u003e\n\u003cp\u003eBigBattery publishes a 30-Day Money Back Guarantee; per BigBattery, non-defective returns are refunded at purchase price minus a 20% restocking fee, excluding shipping. All returns require a Return Merchandise Authorization (RMA) before anything ships back — call OffGrid Horizon at (302) 496-3554 and we'll open the RMA or warranty claim. We're a family-owned authorized BigBattery partner, and BigBattery backs its batteries with lifetime USA-based technical support.\u003c\/p\u003e\n\n\u003ch2\u003eShipping\u003c\/h2\u003e\n\u003cp\u003eThis kit ships as palletized freight within the United States. Inspect the pallet before signing: note any damage on the delivery receipt and contact us promptly — that notation keeps a freight claim simple.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eIs this a grid-tie system?\u003c\/h3\u003e\n\u003cp\u003eNo — the 6000XP is an off-grid inverter. Per BigBattery, the pairing is sold for home backup and off-grid operation, not as a grid-interactive (sell-back) system.\u003c\/p\u003e\n\u003ch3\u003eWill the NEXUS communicate with the 6000XP?\u003c\/h3\u003e\n\u003cp\u003ePer BigBattery, the NEXUS is compatible with all EG4 inverters, with RS485 \/ RJ45 \/ CAN communications built in. Call us if you want help with settings at commissioning.\u003c\/p\u003e\n\u003ch3\u003eAre solar panels included?\u003c\/h3\u003e\n\u003cp\u003eNo. The 6000XP accepts up to 8,000W of PV per EG4; panels and racking are sized to your site and sold separately.\u003c\/p\u003e\n\u003ch3\u003eCan I add more storage later?\u003c\/h3\u003e\n\u003cp\u003eYes — NEXUS batteries parallel up to 15 units, per BigBattery. The 2- and 3-battery versions of this kit are listed separately.\u003c\/p\u003e\n\u003ch3\u003eWhat about the inverter warranty registration?\u003c\/h3\u003e\n\u003cp\u003ePer EG4, register the inverter within the first year or keep proof of purchase from an authorized distributor. Keep your order confirmation either way — and call us if you'd like a hand with registration.\u003c\/p\u003e\n\u003ch3\u003eDo I need an electrician?\u003c\/h3\u003e\n\u003cp\u003eYes — AC interconnection, grounding, and code compliance are work for a licensed electrician, and most jurisdictions require a permit and inspection.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003eDeciding between the 6000XP and the 12000XP V2? Call OffGrid Horizon at (302) 496-3554 — we're a family-owned authorized BigBattery partner and we'll size it with you honestly.\u003c\/em\u003e\u003c\/p\u003e","brand":"BigBattery","offers":[{"title":"1 × NEXUS — 15 kWh","offer_id":49148866003099,"sku":"K0152","price":4544.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0746\/0614\/9787\/files\/EG4-6000XP-NEXUS-1-1.webp?v=1785535602"},{"product_id":"bigbattery-nexus-eg4-12000xp-v2-off-grid-kit-15-kwh-48v-lifepo4","title":"BigBattery NEXUS + EG4 12000XP V2 Off-Grid Kit | 15 kWh | 48V LiFePO4","description":"\u003cp\u003eThis kit pairs one BigBattery NEXUS 48V LiFePO4 battery — 280Ah, 14.3 kWh usable per BigBattery — with the EG4 12000XP V2 off-grid inverter: 12,000W of continuous split-phase 120\/240V output, up to 24,000W of PV through two 35A MPPTs, and per EG4 enough starting muscle to bring up a 5-ton air conditioner without a soft start. It is an off-grid system — the inverter accepts generator and grid input for charging and bypass, per EG4, but the kit is not sold as a grid-interactive (sell-back) system.\u003c\/p\u003e\n\n\u003ch2\u003eWho This Is For\u003c\/h2\u003e\n\u003cp\u003eFull-size off-grid homes and properties with heavy simultaneous loads — well pump, HVAC, kitchen appliances, and shop tools at the same time — that want maximum inverter headroom while starting with a single battery cabinet. If your loads are cabin-scale, the EG4 6000XP version of this kit is the lighter match; if you cycle the bank heavily every day, see the 30–45 kWh version of this kit.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e12,000W continuous split-phase 120\/240V output\u003c\/strong\u003e, per EG4; surge rated 18,000W (5 seconds), per BigBattery's kit listing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUp to 24,000W of PV input\u003c\/strong\u003e through two 35A MPPTs, per EG4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStarts a 5-ton AC without a soft start\u003c\/strong\u003e, per EG4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGenerator input up to 90A, grid input up to 100A, 100A bypass\u003c\/strong\u003e, per EG4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eParallels up to 16 inverters\u003c\/strong\u003e, per EG4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNEXUS battery: 280Ah, 14.3 kWh usable, 6,000+ cycle life\u003c\/strong\u003e, self-heating function, aerosol fire suppression, per BigBattery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBattery parallels up to 15 units\u003c\/strong\u003e (up to 214.5 kWh), per BigBattery\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy BigBattery\u003c\/h2\u003e\n\u003cp\u003eBigBattery is a US company building LiFePO4 energy storage for off-grid and home backup use. NEXUS batteries ship from Texas, carry a 12-Year Limited Warranty, and are backed by lifetime USA-based technical support, per BigBattery — here matched with EG4's high-output XP-series inverter. Browse our \u003ca href=\"\/collections\/eg4\"\u003eEG4 collection\u003c\/a\u003e for the rest of the line.\u003c\/p\u003e\n\n\u003ch2\u003eWhat's In the Kit\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1 × \u003ca href=\"\/products\/bigbattery-nexus-48v-lifepo4-battery-15-kwh\"\u003eBigBattery NEXUS 48V LiFePO4 battery\u003c\/a\u003e — 280Ah, 14.3 kWh usable per BigBattery\u003c\/li\u003e\n\u003cli\u003e1 × \u003ca href=\"\/products\/eg4-12000xp-v2-off-grid-inverter-12-kw-output-split-phase\"\u003eEG4 12000XP V2 off-grid inverter\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eSolar panels, racking, and array wiring are not included. BigBattery's kit listing does not itemize cables or accessories, so call us at (302) 496-3554 before ordering and we'll confirm exactly what ships with your configuration.\u003c\/p\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery\u003c\/td\u003e\n\u003ctd\u003e1 × BigBattery NEXUS, 48V class (51.2V nominal), LiFePO4, 280Ah\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUsable energy\u003c\/td\u003e\n\u003ctd\u003e14.3 kWh, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery max continuous discharge\u003c\/td\u003e\n\u003ctd\u003e140A (7.6 kW max continuous power), per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery cycle life\u003c\/td\u003e\n\u003ctd\u003e6,000+ cycles, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery communications\u003c\/td\u003e\n\u003ctd\u003eRS485 \/ RJ45 \/ CAN; compatible with all EG4 inverters, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery dimensions \/ weight\u003c\/td\u003e\n\u003ctd\u003e19.7 × 27.5 × 15.7 in; approx. 315 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInverter\u003c\/td\u003e\n\u003ctd\u003eEG4 12000XP V2 — 12,000W continuous, split-phase 120\/240V, per EG4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurge\u003c\/td\u003e\n\u003ctd\u003e18,000W (5 s), per BigBattery's kit listing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSolar input\u003c\/td\u003e\n\u003ctd\u003eUp to 24,000W through two 35A MPPTs, per EG4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAC input \/ bypass\u003c\/td\u003e\n\u003ctd\u003eGenerator up to 90A; grid up to 100A; 100A bypass, per EG4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInverter parallel capability\u003c\/td\u003e\n\u003ctd\u003eUp to 16 units, per EG4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery warranty\u003c\/td\u003e\n\u003ctd\u003e12-Year Limited Warranty, per BigBattery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInverter warranty\u003c\/td\u003e\n\u003ctd\u003e5 years, per BigBattery's kit listing (EG4 warranty terms apply)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eKit SKU\u003c\/td\u003e\n\u003ctd\u003eK0154\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eSizing Your Off-Grid Home\u003c\/h2\u003e\n\u003cp\u003eOne honest number up front: a single NEXUS supports up to 140A — about 7.6 kW — of continuous discharge, per BigBattery. This one-battery kit will not sustain the inverter's full 12,000W continuously from battery alone; sustained whole-home draws call for two or three NEXUS units (two, adding BigBattery's per-unit figures, support about 15.2 kW). The single-battery configuration makes sense when big PV or generator input carries the daytime peaks and the battery's job is overnight essentials.\u003c\/p\u003e\n\u003cp\u003eOn energy, example assumptions — adjust to your household: refrigerator 1.5 kWh\/day, freezer 1.0, lighting 1.0, well pump 1.5, electronics 1.5, laundry and kitchen 3.0. Around 9.5 kWh\/day before air conditioning, so 14.3 kWh usable (per BigBattery) is one comfortable day of autonomy — and a signal that most full-size homes running this inverter end up at the 30–45 kWh version.\u003c\/p\u003e\n\n\u003ch2\u003eInstallation\u003c\/h2\u003e\n\u003cp\u003eSetting the 315 lb battery cabinet and mounting the inverter are the straightforward parts. Wiring 12,000W of split-phase output into a main panel — interconnection, overcurrent protection, grounding, bonding — belongs to a licensed electrician working to the National Electrical Code (NEC) and local codes; most jurisdictions require a permit and inspection for energy storage. Place the battery in a dry space kept above freezing; BigBattery's published charge range starts at 32°F.\u003c\/p\u003e\n\n\u003ch2\u003eWarranty \u0026amp; Support\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eBattery:\u003c\/strong\u003e covered by BigBattery's 12-Year Limited Warranty — in BigBattery's words, “BigBattery, Inc. guarantees that its products will be free from defects in material and workmanship for a period of twelve (12) years.” No registration needed, per BigBattery. \u003cstrong\u003eInverter:\u003c\/strong\u003e 5-year manufacturer warranty, per BigBattery's kit listing; EG4's warranty terms apply, and EG4 asks that products be registered or accompanied by proof of purchase from an authorized distributor — keep your order confirmation.\u003c\/p\u003e\n\u003cp\u003eBigBattery publishes a 30-Day Money Back Guarantee; per BigBattery, non-defective returns are refunded at purchase price minus a 20% restocking fee, excluding shipping. All returns require a Return Merchandise Authorization (RMA) before anything ships back — call OffGrid Horizon at (302) 496-3554 and we'll open the RMA or warranty claim. We're a family-owned authorized BigBattery partner, and BigBattery backs its batteries with lifetime USA-based technical support.\u003c\/p\u003e\n\n\u003ch2\u003eShipping\u003c\/h2\u003e\n\u003cp\u003eThis kit ships as palletized freight within the United States. Inspect the pallet before signing: note any damage on the delivery receipt and contact us promptly — that notation keeps a freight claim simple.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eCan one battery really feed a 12,000W inverter?\u003c\/h3\u003e\n\u003cp\u003eNot at full continuous output — the NEXUS supports about 7.6 kW continuous per BigBattery. This configuration fits homes whose sustained loads sit below that, with the inverter's headroom reserved for starting surges and daytime solar-carried peaks. For sustained heavy loads, start with the 2- or 3-battery version.\u003c\/p\u003e\n\u003ch3\u003eIs this a grid-tie system?\u003c\/h3\u003e\n\u003cp\u003eNo — the 12000XP V2 is an off-grid inverter. Its grid and generator inputs are for charging and bypass, per EG4; it is not sold as a grid-interactive (sell-back) system.\u003c\/p\u003e\n\u003ch3\u003eAre solar panels included?\u003c\/h3\u003e\n\u003cp\u003eNo. The inverter accepts up to 24,000W of PV per EG4; panels and racking are sized to your site and sold separately.\u003c\/p\u003e\n\u003ch3\u003eWill it start my air conditioner or well pump?\u003c\/h3\u003e\n\u003cp\u003ePer EG4, the 12000XP V2 can start a 5-ton AC without a soft start, with 18,000W of 5-second surge per BigBattery's listing. Bring us your nameplate figures and we'll confirm the whole load picture.\u003c\/p\u003e\n\u003ch3\u003eCan I add more storage later?\u003c\/h3\u003e\n\u003cp\u003eYes — NEXUS batteries parallel up to 15 units, per BigBattery. The 2- and 3-battery versions of this kit are listed separately.\u003c\/p\u003e\n\u003ch3\u003eDo I need an electrician?\u003c\/h3\u003e\n\u003cp\u003eYes — AC interconnection, grounding, and code compliance are work for a licensed electrician, and most jurisdictions require a permit and inspection.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003eBig inverter, one battery — right call or not? Call OffGrid Horizon at (302) 496-3554 and we'll walk the math with you. Family-owned, authorized BigBattery partner.\u003c\/em\u003e\u003c\/p\u003e","brand":"BigBattery","offers":[{"title":"1 × NEXUS — 15 kWh","offer_id":49148889792667,"sku":"K0154","price":4940.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0746\/0614\/9787\/files\/EG4-12000XP-NEXUS-5-1.webp?v=1785535623"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0746\/0614\/9787\/collections\/bb_new_logo-460.webp?v=1784752837","url":"https:\/\/offgridhorizon.com\/collections\/bigbattery.oembed?page=3","provider":"OffGrid Horizon","version":"1.0","type":"link"}