{"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\u003eThe BigBattery NEXUS + EG4 12000XP V2 Off-Grid Kit combines a 15 kWh NEXUS 48V LiFePO4 battery with EG4's flagship 12000XP V2 all-in-one off-grid inverter — a whole-home-class power system for full-size off-grid residences, large workshops, and properties running heavy 240V loads. The 12000XP V2 delivers 12,000W of continuous split-phase output with integrated MPPT solar charge controllers and battery charging in one wall-mounted enclosure.\u003c\/p\u003e\n\n\u003ch2\u003eWhat's in this kit\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e1 × BigBattery NEXUS 48V LiFePO4 battery\u003c\/strong\u003e — 15 kWh usable energy storage in a floor-standing cabinet with an integrated battery management system (BMS)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1 × EG4 12000XP V2 all-in-one inverter\u003c\/strong\u003e — 12,000W continuous split-phase 120\/240V output, integrated MPPT solar charge controllers, and built-in AC charging\u003c\/li\u003e\n\u003cli\u003eClosed-loop communication between battery and inverter for accurate state-of-charge reporting and coordinated charging\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eIs this the right size for you?\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIt fits if:\u003c\/strong\u003e you're powering a full-size home or large property off-grid — central or multi-zone air conditioning, a well pump, electric range or dryer, and everyday household loads running at the same time. 12,000W continuous output is enough headroom that you rarely have to think about what's on.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSize down if:\u003c\/strong\u003e your loads are closer to cabin or tiny-home scale. The NEXUS + EG4 6000XP kit or NEXUS + APEX 6.5K kit deliver the same 15 kWh of storage with a smaller, lower-cost inverter.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAdd storage if:\u003c\/strong\u003e you're running large loads through the night — a single 15 kWh NEXUS is the starting point, and additional NEXUS batteries parallel onto the same 48V bus as your usage grows.\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\u003eBigBattery NEXUS, 48V LiFePO4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnergy storage\u003c\/td\u003e\n\u003ctd\u003e15 kWh\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery chemistry\u003c\/td\u003e\n\u003ctd\u003eLithium iron phosphate (LiFePO4)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInverter\u003c\/td\u003e\n\u003ctd\u003eEG4 12000XP V2 all-in-one\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eContinuous output\u003c\/td\u003e\n\u003ctd\u003e12,000W, split-phase 120\/240V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSolar (PV) input\u003c\/td\u003e\n\u003ctd\u003eIntegrated MPPT charge controllers\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSystem voltage\u003c\/td\u003e\n\u003ctd\u003e48V nominal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication\u003c\/td\u003e\n\u003ctd\u003eClosed-loop battery-to-inverter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExpandable\u003c\/td\u003e\n\u003ctd\u003eYes — additional NEXUS batteries can be added in parallel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWarranty \u0026amp; support\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eBattery:\u003c\/strong\u003e the NEXUS is covered by BigBattery's 12-year manufacturer warranty, backed by lifetime USA-based technical support. \u003cstrong\u003eInverter:\u003c\/strong\u003e the EG4 12000XP V2 carries a 5-year full parts-or-product replacement manufacturer warranty; EG4 requires warranty registration within the first year of purchase (or proof of purchase from an authorized distributor) to keep coverage valid.\u003c\/p\u003e\n\n\u003ch2\u003eCommon questions\u003c\/h2\u003e\n\u003ch3\u003eDo I need an electrician to install this?\u003c\/h3\u003e\n\u003cp\u003eThe battery-to-inverter DC connection uses supplied cabling, but the AC side — wiring 12,000W of split-phase output into your main panel — should be performed by a licensed electrician to meet local code.\u003c\/p\u003e\n\u003ch3\u003eAre solar panels included?\u003c\/h3\u003e\n\u003cp\u003eNo. This kit is the storage and inverter core of the system; solar panels are sold separately so you can size the array to your site and the inverter's MPPT input range.\u003c\/p\u003e\n\u003ch3\u003eHow does LiFePO4 handle cold weather?\u003c\/h3\u003e\n\u003cp\u003eLiFePO4 batteries discharge reliably in freezing temperatures, but charging below freezing is restricted by the BMS to protect the cells. Installing the battery in an insulated or conditioned space keeps charging available year-round.\u003c\/p\u003e\n\u003ch3\u003eCan I add more storage later?\u003c\/h3\u003e\n\u003cp\u003eYes. Additional NEXUS batteries parallel onto the same 48V bus, so the battery bank can grow with your household without replacing the inverter.\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","url":"https:\/\/offgridhorizon.com\/products\/bigbattery-nexus-eg4-12000xp-v2-off-grid-kit-15-kwh-48v-lifepo4","provider":"OffGrid Horizon","version":"1.0","type":"link"}