{"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\u003eThe entry point to the NEXUS off-grid line: one BigBattery NEXUS 48V LiFePO4 battery — 15 kWh of storage in a single cabinet — paired with the APEX 6.5K all-in-one off-grid inverter. This is a complete power core for a cabin, small homestead, workshop or backup circuit panel: the APEX 6.5K combines a 6,500W split-phase inverter, an MPPT solar charge controller and a battery charger in one wall-mounted unit, so the battery, solar input and AC output are all managed by a single piece of equipment.\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 (15 kWh)\u003c\/strong\u003e — high-capacity lithium iron phosphate storage with a built-in battery management system (BMS) that monitors and protects the cells. A single NEXUS holds substantial reserve on its own, and additional NEXUS units can be combined later to scale total capacity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1 × APEX 6.5K off-grid inverter\u003c\/strong\u003e — an all-in-one unit built for 48V battery systems: 6,500W of split-phase 120\/240V output, integrated MPPT solar charge controller, and battery charger in a single chassis.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eIs this the right size for you?\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eThis configuration fits\u003c\/strong\u003e a cabin, guest house, seasonal property, well-equipped workshop or a defined set of backup circuits — refrigeration, lighting, pumps, electronics and similar loads. The 6,500W inverter carries both 120V and 240V appliances, and 15 kWh of storage covers overnight use and a cloudy stretch for loads of that scale.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSize up if\u003c\/strong\u003e you are powering a full-time family home, running mini-splits for long hours, or your site sees extended overcast periods — storage is what carries you through those. The same system is available with two or three NEXUS batteries (30 kWh and 45 kWh configurations), and because NEXUS units combine, starting here does not lock you in: additional batteries can be added as your needs grow.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eConsider the APEX 10K version if\u003c\/strong\u003e your peak loads are the concern rather than storage — for example, starting large motors or running several 240V appliances at once.\u003c\/p\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eItem\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery\u003c\/td\u003e\n\u003ctd\u003e1 × BigBattery NEXUS, 48V LiFePO4, 15 kWh\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery chemistry\u003c\/td\u003e\n\u003ctd\u003eLiFePO4 (lithium iron phosphate)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery management\u003c\/td\u003e\n\u003ctd\u003eBuilt-in BMS with cell monitoring and protection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInverter\u003c\/td\u003e\n\u003ctd\u003eAPEX 6.5K all-in-one: 6,500W split-phase 120\/240V output\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSolar charging\u003c\/td\u003e\n\u003ctd\u003eIntegrated MPPT solar charge controller (solar array sold separately)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery charging\u003c\/td\u003e\n\u003ctd\u003eIntegrated charger in the APEX 6.5K\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSystem voltage\u003c\/td\u003e\n\u003ctd\u003e48V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExpansion path\u003c\/td\u003e\n\u003ctd\u003eAdditional NEXUS batteries can be combined; 30 kWh and 45 kWh kit configurations are also available\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 APEX 6.5K carries a 5-year limited manufacturer warranty.\u003c\/p\u003e\n\n\u003ch2\u003eCommon questions\u003c\/h2\u003e\n\n\u003ch3\u003eCan I install this myself?\u003c\/h3\u003e\n\u003cp\u003ePlacing the battery and mounting the inverter are within reach of a competent owner, but the AC side — tying the inverter into a distribution panel, grounding, bonding and code compliance — is work for a licensed electrician, and in most jurisdictions it must be permitted and inspected. Have your electrician review the system before ordering.\u003c\/p\u003e\n\n\u003ch3\u003eDoes this kit include solar panels?\u003c\/h3\u003e\n\u003cp\u003eNo. The APEX 6.5K's MPPT input is ready for a solar array, but panels, mounting hardware and array wiring are sized to your site and sold separately. The system can also run as battery-plus-charger without solar.\u003c\/p\u003e\n\n\u003ch3\u003eHow does the battery handle cold weather?\u003c\/h3\u003e\n\u003cp\u003eLiFePO4 chemistry loses usable capacity in the cold, and charging cells below freezing damages them. The NEXUS should live in a space kept above freezing — a conditioned utility room, insulated enclosure or similar.\u003c\/p\u003e\n\n\u003ch3\u003eCan I add more storage later?\u003c\/h3\u003e\n\u003cp\u003eYes. NEXUS batteries are designed to combine, so you can start with this single-battery kit and add units later rather than buying maximum capacity up front. If you already know you need more, the 2 × NEXUS (30 kWh) and 3 × NEXUS (45 kWh) versions of this kit are listed separately.\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","url":"https:\/\/offgridhorizon.com\/products\/bigbattery-nexus-apex-6-5k-off-grid-kit-15-kwh-48v-lifepo4","provider":"OffGrid Horizon","version":"1.0","type":"link"}