{"product_id":"bigbattery-ethos-eg4-flexboss21-ess","title":"BigBattery ETHOS + EG4 FLEXBOSS21 ESS","description":"\u003ch2 style=\"text-align: center;\"\u003e\n\u003cspan style=\"color: rgb(50, 149, 66);\"\u003e\u003cstrong\u003eBigBattery ETHOS + EG4 FLEXBOSS21 ESS\u003c\/strong\u003e\u003c\/span\u003e\u003cbr\u003e\u003cmeta charset=\"utf-8\"\u003e\n\u003c\/h2\u003e\n\u003ch3 class=\"content__summary-title\"\u003e\u003cstrong\u003eProduct Summary:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cdiv class=\"woocommerce-product-details__short-description\"\u003e\n\u003cp data-end=\"565\" data-start=\"194\"\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong data-end=\"247\" data-start=\"198\"\u003eBigBattery ETHOS™ + EG4 FlexBOSS21 ESS System\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis a complete, next-generation energy solution designed for both\u003cspan\u003e \u003c\/span\u003e\u003cstrong data-end=\"350\" data-start=\"313\"\u003eon-grid and off-grid applications\u003c\/strong\u003e. Combining the\u003cspan\u003e \u003c\/span\u003e\u003cstrong data-end=\"411\" data-start=\"366\"\u003escalable ETHOS 48V lithium battery system\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ewith the powerful\u003cspan\u003e \u003c\/span\u003e\u003cstrong data-end=\"460\" data-start=\"430\"\u003eFlexBOSS21 hybrid inverter\u003c\/strong\u003e, this system delivers advanced, efficient, and intelligent energy management in one integrated package.\u003c\/p\u003e\n\u003cdiv id=\"bb-see-more-1\" class=\"bb-see-more\"\u003e\n\u003cdiv class=\"bb-see-more-content\"\u003e\n\u003cp data-end=\"956\" data-start=\"567\"\u003eExpandable up to\u003cspan\u003e \u003c\/span\u003e\u003cstrong data-end=\"594\" data-start=\"583\"\u003e80+ kWh\u003c\/strong\u003e, the ETHOS battery grows with your energy needs – while the FlexBOSS21 delivers\u003cspan\u003e \u003c\/span\u003e\u003cstrong data-end=\"688\" data-start=\"673\"\u003e12kW output\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eand up to\u003cspan\u003e \u003c\/span\u003e\u003cstrong data-end=\"719\" data-start=\"699\"\u003e21,000W PV input\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ewith\u003cspan\u003e \u003c\/span\u003e\u003cstrong data-end=\"736\" data-start=\"725\"\u003e3 MPPTs\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003efor maximum solar optimization. Integrated with the\u003cspan\u003e \u003c\/span\u003e\u003cstrong data-end=\"813\" data-start=\"789\"\u003eGridBOSS MID gateway\u003c\/strong\u003e, the system enables advanced energy control, including load management, AC coupling, and generator integration.\u003c\/p\u003e\n\u003cp data-end=\"1195\" data-start=\"958\"\u003eDesigned with\u003cspan\u003e \u003c\/span\u003e\u003cstrong data-end=\"977\" data-start=\"941\"\u003eUL 9540 certified configurations\u003c\/strong\u003e, advanced battery management, and\u003cspan\u003e \u003c\/span\u003e\u003cstrong data-end=\"1042\" data-start=\"1012\"\u003eU.S.-engineered components\u003c\/strong\u003e, this system ensures safe, maintenance-free performance with seamless closed-loop communication and real-time monitoring.\u003c\/p\u003e\n\u003cp data-end=\"1334\" data-start=\"1197\"\u003e\u003cstrong data-end=\"1234\" data-start=\"1219\"\u003eShips From:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eTexas, USA\u003cbr data-end=\"1253\" data-start=\"1250\"\u003e\u003cstrong data-end=\"1266\" data-start=\"1253\"\u003eWarranty:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e12 Years (Battery), 10 Years (Inverter)\u003cbr data-end=\"1288\" data-start=\"1285\"\u003e\u003cstrong data-end=\"1300\" data-start=\"1288\"\u003eSupport:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eLifetime USA-Based Tech Support\u003c\/p\u003e\n\u003ch3 data-end=\"1361\" data-start=\"1341\" data-section-id=\"18fxkdn\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-end=\"1361\" data-start=\"1344\"\u003eCompatibility\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp data-end=\"1366\" data-start=\"1332\"\u003e\u003cstrong data-end=\"1366\" data-start=\"1332\"\u003eIntegrated \u0026amp; Optimized System:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-end=\"1424\" data-start=\"1367\"\u003e\n\u003cli data-end=\"1424\" data-start=\"1367\" data-section-id=\"14ynu0\"\u003eETHOS Battery System + EG4 FlexBOSS21 Hybrid Inverter\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"1452\" data-start=\"1426\"\u003e\u003cstrong data-end=\"1452\" data-start=\"1426\"\u003eExpandable \u0026amp; Flexible:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-end=\"1627\" data-start=\"1453\"\u003e\n\u003cli data-end=\"1502\" data-start=\"1453\" data-section-id=\"17eyxqi\"\u003eScalable ETHOS battery capacity up to 80+ kWh\u003c\/li\u003e\n\u003cli data-end=\"1568\" data-start=\"1503\" data-section-id=\"1i9563i\"\u003eCompatible with additional ETHOS modules for future expansion\u003c\/li\u003e\n\u003cli data-end=\"1627\" data-start=\"1569\" data-section-id=\"r3gs9b\"\u003eSupports grid-tied, hybrid, and off-grid installations\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-end=\"1653\" data-start=\"1634\" data-section-id=\"1j5qwet\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-end=\"1653\" data-start=\"1637\"\u003eKey Features\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul data-end=\"2670\" data-start=\"1655\"\u003e\n\u003cli data-end=\"1749\" data-start=\"1655\" data-section-id=\"1eja3v9\"\u003e\n\u003cstrong data-end=\"1682\" data-start=\"1657\"\u003eComplete ESS Solution\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e– Battery + inverter system designed to work seamlessly together\u003c\/li\u003e\n\u003cli data-end=\"1832\" data-start=\"1750\" data-section-id=\"3kwtc5\"\u003e\n\u003cstrong data-end=\"1772\" data-start=\"1752\"\u003e21,000W PV Input\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e– High solar capacity with 3 MPPTs for maximum efficiency\u003c\/li\u003e\n\u003cli data-end=\"1908\" data-start=\"1833\" data-section-id=\"dlf2qe\"\u003e\n\u003cstrong data-end=\"1856\" data-start=\"1835\"\u003e12kW Output Power\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e– Supports residential and light commercial loads\u003c\/li\u003e\n\u003cli data-end=\"1989\" data-start=\"1909\" data-section-id=\"d80upy\"\u003e\n\u003cstrong data-end=\"1942\" data-start=\"1911\"\u003e120\/240V Split-Phase Output\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e– Reliable power for whole-home applications\u003c\/li\u003e\n\u003cli data-end=\"2076\" data-start=\"1990\" data-section-id=\"185zn5\"\u003e\n\u003cstrong data-end=\"2021\" data-start=\"1992\"\u003eLiFePO₄ Battery Chemistry\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e– Safe, stable lithium technology with long lifespan\u003c\/li\u003e\n\u003cli data-end=\"2155\" data-start=\"2077\" data-section-id=\"1o9om7f\"\u003e\n\u003cstrong data-end=\"2100\" data-start=\"2079\"\u003e6,000+ Cycle Life\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e– Built for years of daily use and long-term savings\u003c\/li\u003e\n\u003cli data-end=\"2243\" data-start=\"2156\" data-section-id=\"hdjfgj\"\u003e\n\u003cstrong data-end=\"2187\" data-start=\"2158\"\u003eClosed-Loop Communication\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e– Optimized coordination between battery and inverter\u003c\/li\u003e\n\u003cli data-end=\"2335\" data-start=\"2244\" data-section-id=\"cv6tzf\"\u003e\n\u003cstrong data-end=\"2270\" data-start=\"2246\"\u003eGridBOSS Integration\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e– Advanced load management, AC coupling, and generator support\u003c\/li\u003e\n\u003cli data-end=\"2437\" data-start=\"2336\" data-section-id=\"thmj4t\"\u003e\n\u003cstrong data-end=\"2369\" data-start=\"2338\"\u003eAdvanced Safety Protections\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e– Includes rapid shutdown, ground fault, and arc fault protection\u003c\/li\u003e\n\u003cli data-end=\"2516\" data-start=\"2438\" data-section-id=\"1v2h3jo\"\u003e\n\u003cstrong data-end=\"2461\" data-start=\"2440\"\u003eModular Expansion\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e– Easily scale storage capacity as energy needs grow\u003c\/li\u003e\n\u003cli data-end=\"2603\" data-start=\"2517\" data-section-id=\"4od9cr\"\u003e\n\u003cstrong data-end=\"2549\" data-start=\"2519\"\u003eRemote Monitoring \u0026amp; Alerts\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e– Wi-Fi connectivity with real-time system tracking\u003c\/li\u003e\n\u003cli data-end=\"2670\" data-start=\"2604\" data-section-id=\"1ph7tfo\"\u003e\n\u003cstrong data-end=\"2636\" data-start=\"2606\"\u003eMaintenance-Free Operation\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e– No routine servicing required\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"1397\" data-start=\"1363\"\u003eA\u003cspan\u003e \u003c\/span\u003e\u003cstrong data-end=\"2727\" data-start=\"2679\"\u003epowerful, future-ready energy storage system\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ebuilt for flexibility, performance, and long-term independence – backed by advanced controls, safety, and U.S.-based support.\u003c\/p\u003e\n\u003ch3 data-end=\"1397\" data-start=\"1363\"\u003e\u003cstrong\u003eKit includes- Quantities depends on ESS Configuration\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-end=\"1397\" data-start=\"1363\"\u003e\u003cspan class=\"bb-item-title\"\u003eBigBattery ETHOS | 48V - 5.1kWh | UL1973 | Home Battery Backup LFP\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv class=\"bb-items-included-frontend\"\u003e\n\u003cdiv class=\"bb-item-frontend\"\u003e\n\u003cdiv class=\"bb-item-info\"\u003e\u003cspan class=\"bb-item-title\"\u003eETHOS Control Box\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bb-item-frontend\"\u003e\n\u003cdiv class=\"bb-item-info\"\u003e\u003cspan class=\"bb-item-title\"\u003eEG4 FlexBOSS21 Hybrid Solar Inverter | 21kW PV \/ 16kW AC | Split-Phase | 4-MPPT | Scalable | Remote Wi-Fi Monitoring\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bb-item-frontend\"\u003e\n\u003cdiv class=\"bb-item-info\"\u003e\u003cspan class=\"bb-item-title\"\u003e0kWh Ethos Controller to Battery Power Cable 31.5\\\\\\\\\\\\\\\" inch (800mm)\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch5 data-end=\"1397\" data-start=\"1363\"\u003e\n\u003cmeta charset=\"utf-8\"\u003e \u003cspan\u003eDownloads \u0026amp; Specifications\u003c\/span\u003e\n\u003c\/h5\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-header\"\u003e\n\u003ch2\u003eBattery Specifications\u003c\/h2\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-body\"\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eGTIN-12 (U.P.C.):\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e850061252005\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eSystem Voltage:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e48V\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eNominal Voltage:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e51.2V\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eChemistry:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003eLiFePO4\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003ekWh Capacity:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e10.24kWh\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eAh Capacity:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e200Ah\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eCharging Voltage Range:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e55.6 – 57V\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eMax Charge Voltage:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e57V\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eOperating Voltage Range:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e48 – 57V\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eSuggested Low Voltage Cutoff:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e48 – 50.8V\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eBMS Cutoff Range:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e42 – 47V\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eCell Configuration:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e16S 2P\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eMax Continuous Discharge Current:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e200A\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eMax Continuous Power:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e10240W\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eMax Discharge Peak Current:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e300A (Max 5 seconds)\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eMax Charge Current:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e200A\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eCharge Temperature Range:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e32°F – 113°F (0°C – 45°C)\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eDischarge Temperature Range:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e-4°F – 140°F (-20°C – 60°C)\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eOptimal Discharge Temperature Range:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e59°F – 95°F (15°C – 35°C)\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eStorage Temperature Range (SoC \u0026gt;50%):\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e-4°F – 113°F (-20°C – 45°C)(Max 6 months)\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eWeight:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e273 lb (123.8 kg)\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eDepth:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e6.7 in (170 mm)\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eWidth:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e26.5 in (674 mm)\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eHeight:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e43.3 in (1100 mm)\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eMax Connections:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003eUp to (16) parallel connections per control box\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eProtection Rating:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003eIP65 \/ NEMA 4X\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eCommunications:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003eCANBus \/ RS485\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eCertifications:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003eUL9540, UL9540A, UL1973, \u0026amp; UN38.3\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-value\"\u003e\u003c\/span\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cdiv class=\"table-header\"\u003e\n\u003ch2\u003eInverter Specifications\u003c\/h2\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-body\"\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eNominal AC Voltage:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e120\/240VAC | 120\/208VAC (L1\/L2\/N required)\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eFrequency:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e60 Hz (Default) | 50 Hz\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eMax. AC Current:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e50A @ 240V | 57.7A @ 208V\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eMax. AC Input Power:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e12000W\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eMax. AC Bypass:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e90A\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eOperating Voltage Range:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e180 – 270VAC\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eOutput Voltage:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e120\/240VAC | 120\/208VAC (L1\/L2\/N required)\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eMax. Output Current:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e66.7A\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eOutput Frequency:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e60 Hz (Default) | 50 Hz\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eNominal Output Power (without PV):\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e12000W @ 240V | 12000W @ 208V\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eNominal Output Power (with PV):\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e16000W @ 240V | 13800kW @ 208V\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003ePower Factor:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e0.99 (Full Load)\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eReactive Power Adjustment Range:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e-0.8 – 0.8 Leading Adjustable\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eTotal Harmonic Distortion:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e\u0026lt;5% (Full Load)\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eTransfer Time:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e20ms (Default) | 10ms (Configurable) | 20ms (Parallel)\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eRated Output Current:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e50A @ 240V | 57.7A @ 208V\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eNominal Output Voltage:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e120\/240VAC | 120\/208VAC\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eRated Output Power:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e12000W @ 240VAC | 12000W @ 208VAC\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003ePeak Power:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e24000W (0.5 sec) | 18000W (1 sec)\u003cbr\u003e15000W (6 min) | 13200W (12 min)\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eOperating Frequency:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e60 Hz (Default) | 50 Hz\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eTotal Harmonic Distortion Voltage:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e\u0026lt;5%\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eTransfer Time:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e20ms (Default) | 10ms (Configurable) | 20ms (Parallel)\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eNo. of MPPTs:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e3\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eInputs per MPPT:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e2 (MPPT 1) | 2 (MPPT 2) | 1 (MPPT 3)\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eMax. Usable Input Current:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e26A (MPPT 1) | 26A (MPPT 2) | 15A (MPPT 3)\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eMax. Short Circuit Input Current:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e31A (MPPT 1) | 31A (MPPT 2) | 19A (MPPT 3)\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eDC Input Voltage Range:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e100 – 600VDC\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eUnit Start-Up Voltage:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e100VDC\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eMPPT Operating Voltage Range:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e120 – 440VDC\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eNominal MPPT Voltage:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e360VDC\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eMax. Utilized PV Array Power:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e21000W\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eMax. Recommended PV Input:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e25000W\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eMax. Efficiency:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e97% (PV to Grid) | 94.5% (PV to Battery) | 94% (Battery to Grid)\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eIdle Consumption:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e\u0026lt;65W\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eNominal Voltage:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e48VDC\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eVoltage Range:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e40 – 60VDC\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eMax. Charge \/ Discharge Power:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e12000W\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eRecommended Battery Capacity per Inverter:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e\u0026gt;300Ah\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eOperating \/ Storage Temperature Range:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e-13ºF – 140ºF (-25ºC – 60ºC)\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eOperating Altitude:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e\u0026lt;6,561 ft (2000 m)\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eRelative Humidity:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e0 – 100%\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eTypical Noise Emission:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e\u0026lt;50dB @ 3 ft\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eDesign Topology:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003eHigh-Frequency \/ Transformerless\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eProtection Rating:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003eIP65 \/ NEMA 4X\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eCommunications:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003eRS485 \/ CANBus \/ WiFi\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eMax. Parallel Connections:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e16\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eWeight:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e88 lbs (40 kg)\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eDepth:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e11.3 in (287 mm)\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eWidth:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e22.3 in (567 mm)\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eHeight:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003e30.5 in (775 mm)\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-value\"\u003e\u003c\/span\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cdiv class=\"table-header\"\u003e\n\u003ch2\u003eBattery Downloads\u003c\/h2\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-body\"\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eSKU#:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003eK0241, K0242, K0243, K0244, K0245, K0246, K0247, K0248, K0249, K0250, K0251\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eSpec Sheet:\u003c\/span\u003e\u003ca rel=\"noopener\" href=\"https:\/\/bigbattery.com\/wp-content\/uploads\/2025\/11\/ETHOS-NEW-SpecSheet-1.5-BatteryCB.pdf\" class=\"download-btn\" target=\"_blank\"\u003e\u003cimg alt=\"Download\" src=\"https:\/\/bigbattery.com\/wp-content\/themes\/shoptimizer-child\/template-parts\/product\/assets\/images\/download.png\" decoding=\"async\"\u003eDOWNLOAD\u003c\/a\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eUser Manual:\u003c\/span\u003e\u003ca rel=\"noopener\" href=\"https:\/\/bigbattery.com\/wp-content\/uploads\/2024\/08\/ETHOSManual-halfletter-V1.5.pdf\" class=\"download-btn\" target=\"_blank\"\u003e\u003cimg alt=\"Download\" src=\"https:\/\/bigbattery.com\/wp-content\/themes\/shoptimizer-child\/template-parts\/product\/assets\/images\/download.png\" decoding=\"async\"\u003eDOWNLOAD\u003c\/a\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eUL9540 Certificate – BigBattery ETHOS + EG4 FlexBOSS21:\u003c\/span\u003e\u003ca rel=\"noopener\" href=\"https:\/\/bigbattery.com\/wp-content\/uploads\/2023\/11\/ETHOS-NEW-COC.pdf\" class=\"download-btn\" target=\"_blank\"\u003e\u003cimg alt=\"Download\" src=\"https:\/\/bigbattery.com\/wp-content\/themes\/shoptimizer-child\/template-parts\/product\/assets\/images\/download.png\" decoding=\"async\"\u003eDOWNLOAD\u003c\/a\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eUL9540A Certificate:\u003c\/span\u003e\u003ca rel=\"noopener\" href=\"https:\/\/bigbattery.com\/wp-content\/uploads\/2024\/08\/UL9540A-Certificate-1.pdf\" class=\"download-btn\" target=\"_blank\"\u003e\u003cimg alt=\"Download\" src=\"https:\/\/bigbattery.com\/wp-content\/themes\/shoptimizer-child\/template-parts\/product\/assets\/images\/download.png\" decoding=\"async\"\u003eDOWNLOAD\u003c\/a\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eUL1973 Certificate:\u003c\/span\u003e\u003ca rel=\"noopener\" href=\"https:\/\/bigbattery.com\/wp-content\/uploads\/2024\/02\/UL1973-ETHOS.pdf\" class=\"download-btn\" target=\"_blank\"\u003e\u003cimg alt=\"Download\" src=\"https:\/\/bigbattery.com\/wp-content\/themes\/shoptimizer-child\/template-parts\/product\/assets\/images\/download.png\" decoding=\"async\"\u003eDOWNLOAD\u003c\/a\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eUN38.3 Certificate:\u003c\/span\u003e\u003ca rel=\"noopener\" href=\"https:\/\/bigbattery.com\/wp-content\/uploads\/2024\/08\/48V-ETHOS-DOC-UN38.3.pdf\" class=\"download-btn\" target=\"_blank\"\u003e\u003cimg alt=\"Download\" src=\"https:\/\/bigbattery.com\/wp-content\/themes\/shoptimizer-child\/template-parts\/product\/assets\/images\/download.png\" decoding=\"async\"\u003eDOWNLOAD\u003c\/a\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eSafety Data Sheet:\u003c\/span\u003e\u003ca rel=\"noopener\" href=\"https:\/\/bigbattery.com\/wp-content\/uploads\/2023\/11\/SDS_BigBattery_LFP-1.pdf\" class=\"download-btn\" target=\"_blank\"\u003e\u003cimg alt=\"Download\" src=\"https:\/\/bigbattery.com\/wp-content\/themes\/shoptimizer-child\/template-parts\/product\/assets\/images\/download.png\" decoding=\"async\"\u003eDOWNLOAD\u003c\/a\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eCEC Listing – BigBattery ETHOS + EG4 FlexBOSS21:\u003c\/span\u003e\u003ca rel=\"noopener\" href=\"https:\/\/solarequipment.energy.ca.gov\/Home\/EnergyStorage?ManufacturerID=BigBattery%2C+Inc.\u0026amp;amp;ModelNameID=-1\u0026amp;amp;Submit=Search\u0026amp;amp;Rows=25\" class=\"download-btn\" target=\"_blank\"\u003e\u003cimg alt=\"Go to link\" src=\"https:\/\/bigbattery.com\/wp-content\/themes\/shoptimizer-child\/template-parts\/product\/assets\/images\/gotolink.png\" decoding=\"async\"\u003eGO TO LINK\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-value\"\u003e\u003c\/span\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cdiv class=\"table-header\"\u003e\n\u003ch2\u003eInverter Downloads\u003c\/h2\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-body\"\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eSKU#:\u003c\/span\u003e\u003cspan class=\"row-value\"\u003eK0241, K0242, K0243, K0244, K0245, K0246, K0247, K0248, K0249, K0250, K0251\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eSpec Sheet:\u003c\/span\u003e\u003ca class=\"download-btn\" href=\"https:\/\/bigbattery.com\/wp-content\/uploads\/2025\/01\/EG4-FlexBoss21-Spec-Sheet.pdf\" rel=\"noopener\" target=\"_blank\"\u003e\u003cimg decoding=\"async\" src=\"https:\/\/bigbattery.com\/wp-content\/themes\/shoptimizer-child\/template-parts\/product\/assets\/images\/download.png\" alt=\"Download\"\u003eDOWNLOAD\u003c\/a\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eUser Manual:\u003c\/span\u003e\u003ca class=\"download-btn\" href=\"https:\/\/bigbattery.com\/wp-content\/uploads\/2025\/01\/FlexBOSS-21-Manual.pdf\" rel=\"noopener\" target=\"_blank\"\u003e\u003cimg decoding=\"async\" src=\"https:\/\/bigbattery.com\/wp-content\/themes\/shoptimizer-child\/template-parts\/product\/assets\/images\/download.png\" alt=\"Download\"\u003eDOWNLOAD\u003c\/a\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eUL1741 Certificate:\u003c\/span\u003e\u003ca class=\"download-btn\" href=\"https:\/\/bigbattery.com\/wp-content\/uploads\/2024\/11\/EG4-FlexBoss21-COC.pdf\" rel=\"noopener\" target=\"_blank\"\u003e\u003cimg decoding=\"async\" src=\"https:\/\/bigbattery.com\/wp-content\/themes\/shoptimizer-child\/template-parts\/product\/assets\/images\/download.png\" alt=\"Download\"\u003eDOWNLOAD\u003c\/a\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-key\"\u003eCEC Listing – BigBattery ETHOS + EG4 FlexBOSS21:\u003c\/span\u003e\u003ca class=\"download-btn\" href=\"https:\/\/solarequipment.energy.ca.gov\/Home\/EnergyStorage?ManufacturerID=EG4+Electronics+LLC\u0026amp;amp;ModelNameID=-1\u0026amp;amp;Submit=Search\u0026amp;amp;Rows=25\" rel=\"noopener\" target=\"_blank\"\u003e\u003cimg decoding=\"async\" src=\"https:\/\/bigbattery.com\/wp-content\/themes\/shoptimizer-child\/template-parts\/product\/assets\/images\/gotolink.png\" alt=\"Go to link\"\u003eGO TO LINK\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"table-row\"\u003e\n\u003cspan class=\"row-value\"\u003e\u003c\/span\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"BigBattery","offers":[{"title":"1x FlexBOSS21 + 2x ETHOS","offer_id":48629220442358,"sku":"K0241","price":6460.0,"currency_code":"USD","in_stock":true},{"title":"1x FlexBOSS21 + 3x ETHOS","offer_id":50445961724150,"sku":"K0242","price":7720.0,"currency_code":"USD","in_stock":true},{"title":"1x FlexBOSS21 + 4x ETHOS","offer_id":50445961756918,"sku":"K0243","price":9195.0,"currency_code":"USD","in_stock":true},{"title":"1x FlexBOSS21 + 6x ETHOS","offer_id":50445961789686,"sku":"K0244","price":11695.0,"currency_code":"USD","in_stock":true},{"title":"1x FlexBOSS21 + 8x ETHOS","offer_id":50445961822454,"sku":"K0245","price":14590.0,"currency_code":"USD","in_stock":true},{"title":"1x FlexBOSS21 + 9x ETHOS","offer_id":50445961855222,"sku":"K0246","price":15850.0,"currency_code":"USD","in_stock":true},{"title":"2x FlexBOSS21 + 6x ETHOS","offer_id":50445961887990,"sku":"K0247","price":15475.0,"currency_code":"USD","in_stock":true},{"title":"2x FlexBOSS21 + 12x ETHOS","offer_id":50445961920758,"sku":"K0248","price":23425.0,"currency_code":"USD","in_stock":true},{"title":"3x FlexBOSS21 + 9x ETHOS","offer_id":50445961986294,"sku":"K0249","price":23195.0,"currency_code":"USD","in_stock":true},{"title":"3x FlexBOSS21 + 12x 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