{"product_id":"ethos-eg4-flexboss21-ess","title":"BigBattery ETHOS + EG4 FlexBOSS21 | 16kW Hybrid Solar ESS","description":"\u003ciframe width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/WJBwmXjI2Lc?si=gIZzo-KDQkU2cr6i\" title=\"YouTube video player\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen\u003e\u003c\/iframe\u003e\n\n\u003ch3 data-end=\"46\" data-start=\"0\"\u003eETHOS EG4 FlexBOSS21 ESS\u003c\/h3\u003e\n\u003cdiv class=\"container\"\u003e\n\u003cdiv class=\"markdown markdown-main-panel enable-updated-hr-color\" id=\"model-response-message-contentr_a55b2c25bba90575\" aria-live=\"polite\" aria-busy=\"false\" dir=\"ltr\"\u003e\n\u003cp data-path-to-node=\"6\"\u003eThe ETHOS + EG4 FlexBOSS21 ESS is a fully integrated energy storage system built to support both grid-connected and off-grid setups. It pairs the expandable ETHOS 48V lithium battery platform with the 16kW EG4 FlexBOSS21 hybrid inverter to create a smart, all-in-one solution for managing solar and backup power more efficiently. Backed by U.S.-engineered components and a 12-year battery warranty, this system offers reliable, maintenance-free performance.\u003c\/p\u003e\n\u003cp data-path-to-node=\"7\"\u003e\u003cb data-path-to-node=\"7\" data-index-in-node=\"0\"\u003eKey Features\u003c\/b\u003e\u003c\/p\u003e\n\u003cul data-path-to-node=\"8\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"8,0,0\"\u003e\u003cb data-path-to-node=\"8,0,0\" data-index-in-node=\"0\"\u003eHigh-Capacity Storage:\u003c\/b\u003e Features 21kWh of initial energy storage, utilizing stackable LiFePO4 modules.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"8,1,0\"\u003e\u003cb data-path-to-node=\"8,1,0\" data-index-in-node=\"0\"\u003ePowerful Hybrid Inverter:\u003c\/b\u003e Includes a 16kW hybrid inverter designed for demanding residential and commercial applications.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"8,2,0\"\u003e\u003cb data-path-to-node=\"8,2,0\" data-index-in-node=\"0\"\u003eSafe LiFePO4 Technology:\u003c\/b\u003e Uses Lithium Iron Phosphate chemistry for enhanced thermal stability and a 6,000+ cycle life.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"8,3,0\"\u003e\u003cb data-path-to-node=\"8,3,0\" data-index-in-node=\"0\"\u003eModular Expansion:\u003c\/b\u003e Future-ready design allows battery expansion up to 80+ kWh.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"8,4,0\"\u003e\u003cb data-path-to-node=\"8,4,0\" data-index-in-node=\"0\"\u003eIntelligent Management:\u003c\/b\u003e Features an integrated Battery Management System (BMS) with closed-loop communication.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"8,5,0\"\u003e\u003cb data-path-to-node=\"8,5,0\" data-index-in-node=\"0\"\u003eWeather-Resistant:\u003c\/b\u003e NEMA 4X and IP65 rated enclosure for safe indoor or outdoor installation.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"8,6,0\"\u003e\u003cb data-path-to-node=\"8,6,0\" data-index-in-node=\"0\"\u003eComprehensive Safety:\u003c\/b\u003e Includes built-in fire protection, overcharge protection, and temperature monitoring.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-path-to-node=\"9\"\u003e\u003cb data-path-to-node=\"9\" data-index-in-node=\"0\"\u003ePerformance and Efficiency\u003c\/b\u003e\u003c\/p\u003e\n\u003cul data-path-to-node=\"10\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"10,0,0\"\u003e\u003cb data-path-to-node=\"10,0,0\" data-index-in-node=\"0\"\u003eWhole-Home Power:\u003c\/b\u003e Delivers split-phase 120\/240V output to support heavy household loads.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"10,1,0\"\u003e\u003cb data-path-to-node=\"10,1,0\" data-index-in-node=\"0\"\u003eOptimized Solar Harvest:\u003c\/b\u003e Utilizes multiple MPPT trackers for maximum efficiency across diverse solar arrays.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"10,2,0\"\u003e\u003cb data-path-to-node=\"10,2,0\" data-index-in-node=\"0\"\u003eResilience:\u003c\/b\u003e The system is engineered for consistent performance across a wide range of energy demands.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-path-to-node=\"11\"\u003e\u003cb data-path-to-node=\"11\" data-index-in-node=\"0\"\u003eProduct Details\u003c\/b\u003e\u003c\/p\u003e\n\u003cul data-path-to-node=\"12\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"12,0,0\"\u003e\u003cb data-path-to-node=\"12,0,0\" data-index-in-node=\"0\"\u003eBattery Specifications:\u003c\/b\u003e Each module offers 10.24kWh capacity with a 51.2V nominal voltage and 200Ah capacity.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"12,1,0\"\u003e\u003cb data-path-to-node=\"12,1,0\" data-index-in-node=\"0\"\u003eInverter Specifications:\u003c\/b\u003e 16kW output supporting both battery-only and solar-assisted modes.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"12,2,0\"\u003e\u003cb data-path-to-node=\"12,2,0\" data-index-in-node=\"0\"\u003eCharging Range:\u003c\/b\u003e Standard charging voltage range is between 55.6V and 57V.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"12,3,0\"\u003e\u003cb data-path-to-node=\"12,3,0\" data-index-in-node=\"0\"\u003eConnectivity:\u003c\/b\u003e Supports CANBus and RS485 communication protocols for seamless inverter integration.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"12,4,0\"\u003e\u003cb data-path-to-node=\"12,4,0\" data-index-in-node=\"0\"\u003eMonitoring:\u003c\/b\u003e Equipped with an LCD display and remote Wi-Fi monitoring capabilities.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-path-to-node=\"13\"\u003e\u003cb data-path-to-node=\"13\" data-index-in-node=\"0\"\u003eWhat’s Included\u003c\/b\u003e\u003c\/p\u003e\n\u003cul data-path-to-node=\"14\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"14,0,0\"\u003eETHOS lithium battery modules.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"14,1,0\"\u003eETHOS Control Box and master BMS unit.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"14,2,0\"\u003eEG4 FlexBOSS21 hybrid inverter system.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"14,3,0\"\u003eIntegrated monitoring system and mounting components.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-path-to-node=\"15\"\u003e\u003cb data-path-to-node=\"15\" data-index-in-node=\"0\"\u003eApplications\u003c\/b\u003e\u003c\/p\u003e\n\u003cul data-path-to-node=\"16\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"16,0,0\"\u003eResidential solar energy storage and whole-home backup.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"16,1,0\"\u003eOff-grid installations and peak energy cost management.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"16,2,0\"\u003eCommercial energy storage solutions.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-path-to-node=\"17\"\u003e\u003cb data-path-to-node=\"17\" data-index-in-node=\"0\"\u003eSafety and Protection\u003c\/b\u003e\u003c\/p\u003e\n\u003cul data-path-to-node=\"18\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"18,0,0\"\u003eAdvanced BMS for real-time regulation of voltage, current, and temperature.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"18,1,0\"\u003eShort circuit, overload, and over-discharge protection.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"18,2,0\"\u003eUL 9540, UL 9540A, and UL 1973 certified for rigorous safety compliance.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-path-to-node=\"19\"\u003e\u003cb data-path-to-node=\"19\" data-index-in-node=\"0\"\u003eExpandable Design\u003c\/b\u003e The modular structure allows the system to scale as energy requirements grow. Up to 10 inverter units can be connected in parallel for a combined output of up to 160kW, making it a highly flexible long-term energy solution.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!----\u003e\n\u003c\/div\u003e\n\u003cp data-end=\"3535\" data-start=\"3330\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0905\/1868\/3895\/files\/1.jpg?v=1775011481\" alt=\"\"\u003e\u003c\/p\u003e\n\u003ch4 data-start=\"3537\" data-end=\"3558\"\u003eDocument Links\u003cbr\u003e\u003cbr\u003e\n\u003c\/h4\u003e\n\u003cp\u003e\u003cstrong data-start=\"1869\" data-end=\"1891\"\u003eBattery Downloads:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/bigbattery.com\/wp-content\/uploads\/2025\/11\/ETHOS-NEW-SpecSheet-1.5-BatteryCB.pdf\"\u003e\u003cspan\u003eSpec Sheet\u003c\/span\u003e\u003c\/a\u003e\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/bigbattery.com\/wp-content\/uploads\/2024\/08\/ETHOSManual-halfletter-V1.5.pdf\"\u003e\u003cspan\u003eUser Manual\u003c\/span\u003e\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003e\u003cspan class=\"row-key\"\u003e\u003ca href=\"https:\/\/bigbattery.com\/wp-content\/uploads\/2023\/11\/SDS_BigBattery_LFP-1.pdf\"\u003eSafety Data Sheet\u003c\/a\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/bigbattery.com\/wp-content\/uploads\/2023\/11\/ETHOS-NEW-COC.pdf\"\u003e\u003cspan\u003e\u003cspan class=\"row-key\"\u003eUL9540 Certificate – BigBattery ETHOS + EG4 FlexBOSS21:\u003c\/span\u003e\u003c\/span\u003e\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eInverter Downloads\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/bigbattery.com\/wp-content\/uploads\/2025\/01\/EG4-FlexBoss21-Spec-Sheet.pdf\"\u003e\u003cspan\u003eSpec Sheet:\u003c\/span\u003e\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/bigbattery.com\/wp-content\/uploads\/2025\/01\/FlexBOSS-21-Manual.pdf\"\u003e\u003cspan\u003eUser Manual\u003c\/span\u003e\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/bigbattery.com\/wp-content\/uploads\/2024\/11\/EG4-FlexBoss21-COC.pdf\"\u003e\u003cspan\u003eUL1741 Certificate\u003c\/span\u003e\u003c\/a\u003e\u003cspan\u003e\u003cspan class=\"row-key\"\u003e\u003c\/span\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"EG4","offers":[{"title":"1x FlexBOSS21 + 2x ETHOS","offer_id":50652179857655,"sku":"K0241","price":6675.0,"currency_code":"USD","in_stock":true},{"title":"1x FlexBOSS21 + 3x ETHOS Battery Selected:  3× 48V ETHOS  Total Capacity: 15.36 kWh","offer_id":50652179890423,"sku":"K0242","price":7975.0,"currency_code":"USD","in_stock":true},{"title":"1x FlexBOSS21 + 4x ETHOS Battery Selected  4× 48V ETHOS  Total Capacity  20.48 kWh","offer_id":50652179923191,"sku":"K0243","price":9465.0,"currency_code":"USD","in_stock":true},{"title":"1x FlexBOSS21 + 6x ETHOS  Battery Selected  6× 48V ETHOS  Total Capacity  30.72 kWh","offer_id":50652179955959,"sku":"K0244","price":12045.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0905\/1868\/3895\/files\/1ETHOS_EG4FLEXBOSS21ESS.png?v=1775017891","url":"https:\/\/northgridsupply.com\/products\/ethos-eg4-flexboss21-ess","provider":"Northgrid Supply","version":"1.0","type":"link"}