{"product_id":"eg4-wallmount-48v-16kwh-indoor-battery-ess-314ah-eg4-flexboss21-hybrid-inverter-grid-tied-system","title":"EG4 WallMount 48V 16kWh Indoor Battery ESS | 314Ah | EG4 FlexBOSS21 Hybrid Inverter | Grid-Tied System","description":"\u003cstyle\u003e\n.eg4314fb21-pd {\n  --ink: #000000;\n  --ink-2: #141414;\n  --paper: #F7F7F7;\n  --card: #FFFFFF;\n  --text: #000000;\n  --text-light: #FFFFFF;\n  --muted: #5C5C5C;\n  --accent: #246AAF;\n  --accent-2: #36AF24;\n  --line: #E2E2E2;\n  --radius: 14px;\n  --font-display: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;\n  --font-mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;\n  font-family: var(--font-display) !important;\n  color: var(--text) !important;\n  opacity: 1 !important;\n  background: var(--card);\n  line-height: 1.65;\n  font-size: 16px;\n  border: 1px solid var(--line);\n  border-radius: var(--radius);\n  overflow: hidden;\n  box-shadow: 0 16px 40px rgba(16,20,25,0.10);\n}\n.eg4314fb21-pd, .eg4314fb21-pd *, .eg4314fb21-pd *::before, .eg4314fb21-pd *::after { box-sizing: border-box; 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} }\n\n\/* FAQ *\/\n.efb-faq { padding: 42px 32px; background: var(--paper); }\n.efb-faq details { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 2px 18px; margin-bottom: 10px; }\n.efb-faq summary { cursor: pointer; font-weight: 600; font-size: 14.8px; padding: 15px 24px 15px 0; list-style: none; position: relative; }\n.efb-faq summary::-webkit-details-marker { display: none; }\n.efb-faq summary::after { content: '+'; position: absolute; right: 0; top: 13px; font-size: 19px; color: var(--accent) !important; }\n.efb-faq details[open] summary::after { content: '\\2013'; }\n.efb-faq details p { padding: 0 0 16px; color: var(--muted) !important; font-size: 13.8px; max-width: 70ch; }\n\n\/* Downloads *\/\n.efb-downloads { padding: 42px 32px; background: var(--card); }\n.eg4314fb21-pd .efb-dl-group-title { font-family: var(--font-mono) !important; font-size: 12px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted) !important; margin-bottom: 12px !important; }\n.efb-dl-block { margin-bottom: 24px; }\n.efb-dl-block:last-child { margin-bottom: 0; }\n.efb-download-list { display: flex; flex-wrap: wrap; gap: 12px; }\n.eg4314fb21-pd .efb-download {\n  display: inline-flex; align-items: center; gap: 10px;\n  padding: 12px 18px;\n  border: 1px solid var(--line);\n  border-radius: 10px;\n  text-decoration: none !important;\n  color: var(--text) !important;\n  font-size: 14px; font-weight: 600;\n  transition: border-color .15s ease, background .15s ease;\n}\n.eg4314fb21-pd .efb-download:hover { border-color: var(--accent) !important; background: var(--paper); }\n.efb-download svg { width: 18px; height: 18px; color: var(--accent) !important; flex-shrink: 0; }\n\n\/* Footer *\/\n.efb-footer { padding: 26px 32px; background: var(--ink); color: var(--text-light); }\n.eg4314fb21-pd .efb-warranty { font-size: 14px; color: var(--text-light) !important; }\n.eg4314fb21-pd .efb-warranty strong { color: var(--accent) !important; }\n\u003c\/style\u003e\n\u003cdiv class=\"eg4314fb21-pd\"\u003e\n\u003c!-- ============ HERO ============ --\u003e\n\u003csection class=\"efb-hero\"\u003e\n\u003cp class=\"efb-eyebrow\"\u003e48V Grid-Tied ESS · EG4 314Ah Indoor + FlexBOSS21\u003c\/p\u003e\n\u003ch2\u003e16kWh of Certified Energy Storage, Paired With a 16kW Hybrid Inverter\u003c\/h2\u003e\n\u003cp class=\"efb-lead\"\u003eThis system pairs one EG4 314Ah Indoor battery (16kWh nominal, 12.86kWh recommended usable) with one EG4 FlexBOSS21 hybrid inverter — up to 16kW of continuous output with PV and grid combined, and up to 21kW of solar input across 3 MPPT trackers and 5 strings. It's built as a UL 9540-eligible pairing with closed-loop communication, GridBOSS-ready for larger system control, and works grid-tied or fully off-grid.\u003c\/p\u003e\n\u003cdiv aria-hidden=\"true\" class=\"efb-divider\"\u003e\u003csvg preserveaspectratio=\"none\" viewbox=\"0 0 600 20\"\u003e\u003cpath stroke-linecap=\"round\" stroke-width=\"2\" stroke=\"currentColor\" fill=\"none\" d=\"M0,10 Q25,-4 50,10 T100,10 T150,10 T200,10 T250,10 T300,10 T350,10 T400,10 T450,10 T500,10 T550,10 T600,10\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\u003c\/div\u003e\n\u003c\/section\u003e\n\u003c!-- ============ STATS ============ --\u003e\n\u003csection class=\"efb-stats\"\u003e\n\u003cdiv class=\"efb-stat\"\u003e\n\u003cspan class=\"num\"\u003e16kWh\u003c\/span\u003e\u003cspan class=\"label\"\u003eBattery Capacity\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"efb-stat\"\u003e\n\u003cspan class=\"num\"\u003e16kW\u003c\/span\u003e\u003cspan class=\"label\"\u003eOutput (PV + Grid)\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"efb-stat\"\u003e\n\u003cspan class=\"num\"\u003e21kW\u003c\/span\u003e\u003cspan class=\"label\"\u003eMax Solar Input\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"efb-stat\"\u003e\n\u003cspan class=\"num\"\u003eUL 9540\u003c\/span\u003e\u003cspan class=\"label\"\u003eEligible Pairing\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003c!-- ============ CONFIGURATION ============ --\u003e\n\u003csection class=\"efb-config\"\u003e\n\u003ch3\u003eWhat's In This System\u003c\/h3\u003e\n\u003cp class=\"efb-config-sub\"\u003eTwo components, pre-matched and sold together.\u003c\/p\u003e\n\u003cdiv class=\"efb-config-grid\"\u003e\n\u003cdiv class=\"efb-config-card\"\u003e\n\u003csvg aria-hidden=\"true\" stroke-linejoin=\"round\" stroke-linecap=\"round\" stroke-width=\"1.7\" stroke=\"currentColor\" fill=\"none\" viewbox=\"0 0 24 24\"\u003e\u003crect rx=\"2\" height=\"9\" width=\"17\" y=\"8\" x=\"2\"\u003e\u003c\/rect\u003e\u003crect stroke=\"none\" fill=\"currentColor\" rx=\"1\" height=\"3\" width=\"2.5\" y=\"11\" x=\"19\"\u003e\u003c\/rect\u003e\u003crect stroke=\"none\" fill=\"currentColor\" rx=\"0.6\" height=\"4.4\" width=\"4\" y=\"10.3\" x=\"5\"\u003e\u003c\/rect\u003e\u003c\/svg\u003e\n\u003cp class=\"qty\"\u003eQty 1\u003c\/p\u003e\n\u003ch4\u003eEG4 314Ah Indoor Battery\u003c\/h4\u003e\n\u003cp\u003e16kWh nominal, IP20 indoor-rated, with a third-generation BMS and Auto-ID setup.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"efb-config-card\"\u003e\n\u003csvg aria-hidden=\"true\" fill=\"currentColor\" viewbox=\"0 0 24 24\"\u003e\u003cpath d=\"M13 2 4 14h6l-1 8 9-12h-6l1-8z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cp class=\"qty\"\u003eQty 1\u003c\/p\u003e\n\u003ch4\u003eEG4 FlexBOSS21 Inverter\u003c\/h4\u003e\n\u003cp\u003eUp to 16kW continuous output with PV and grid combined, and 21kW of max solar input.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003c!-- ============ FEATURES ============ --\u003e\n\u003csection class=\"efb-features\"\u003e\n\u003ch3\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0566\/2418\/5399\/files\/Screenshot_2026-07-26_183740.png?v=1785080309\" alt=\"A man uses his phone outside a solar-powered home featuring three EG4 48V WallMount 16kWh Indoor Self-Heating Batteries (314Ah | UL9540A), while a modern washer and dryer are stacked neatly in the laundry room—all presented on an elegant card design accented by clean, modern sans-serif-inspired lines.\"\u003e\u003c\/h3\u003e\n\u003ch3\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0566\/2418\/5399\/files\/Flexboss-All-weather-Rain.webp?v=1784837257\" alt=\"A modern home equipped with EG4 FlexBOSS18 18kW Split-Phase Hybrid Solar Inverter and battery storage glows brightly at night during a rainstorm, its lights reflecting on the wet driveway. Clean IBM Plex Sans font text with subtle box shadow highlights how the EG4 FlexBOSS18 automatically provides seamless backup power to keep your home illuminated even when the grid goes down.\"\u003e\u003c\/h3\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eWhat Makes This System Different\u003c\/h3\u003e\n\u003cdiv class=\"efb-feature-grid\"\u003e\n\u003cdiv class=\"efb-feature\"\u003e\n\u003csvg aria-hidden=\"true\" stroke-linejoin=\"round\" stroke-linecap=\"round\" stroke-width=\"1.7\" stroke=\"currentColor\" fill=\"none\" viewbox=\"0 0 24 24\"\u003e\u003crect rx=\"2\" height=\"9\" width=\"17\" y=\"8\" x=\"2\"\u003e\u003c\/rect\u003e\u003crect stroke=\"none\" fill=\"currentColor\" rx=\"1\" height=\"3\" width=\"2.5\" y=\"11\" x=\"19\"\u003e\u003c\/rect\u003e\u003crect stroke=\"none\" fill=\"currentColor\" rx=\"0.6\" height=\"4.4\" width=\"4\" y=\"10.3\" x=\"5\"\u003e\u003c\/rect\u003e\u003c\/svg\u003e\n\u003ch4\u003e16kWh Indoor Battery\u003c\/h4\u003e\n\u003cp\u003e12.86kWh of recommended usable capacity, cross-compatible with other EG4 battery models for future scaling.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"efb-feature\"\u003e\n\u003csvg aria-hidden=\"true\" fill=\"currentColor\" viewbox=\"0 0 24 24\"\u003e\u003cpath d=\"M13 2 4 14h6l-1 8 9-12h-6l1-8z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003ch4\u003e16kW Combined, 6kW Battery-Only\u003c\/h4\u003e\n\u003cp\u003eUp to 16kW continuous with PV and grid working together, or 6kW continuous from the battery alone if grid and solar are both unavailable.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"efb-feature\"\u003e\n\u003csvg aria-hidden=\"true\" stroke-linecap=\"round\" stroke-width=\"1.7\" stroke=\"currentColor\" fill=\"none\" viewbox=\"0 0 24 24\"\u003e\u003ccircle r=\"4.2\" cy=\"12\" cx=\"12\"\u003e\u003c\/circle\u003e\u003cpath d=\"M12 3v2M12 19v2M4.2 12H2.2M21.8 12h-2M5.6 5.6l1.4 1.4M17 17l1.4 1.4M18.4 5.6 17 7M7 17l-1.4 1.4\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003ch4\u003e21kW Solar, 3 MPPT \/ 5 Strings\u003c\/h4\u003e\n\u003cp\u003eThree MPPT trackers across five total input strings, for granular tracking on complex or multi-orientation roof layouts.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"efb-feature\"\u003e\n\u003csvg aria-hidden=\"true\" stroke-linejoin=\"round\" stroke-linecap=\"round\" stroke-width=\"1.7\" stroke=\"currentColor\" fill=\"none\" viewbox=\"0 0 24 24\" class=\"efb-accent-2\"\u003e\u003cpath d=\"M12 2 4 5v6c0 5 3.4 8.4 8 9.9 4.6-1.5 8-4.9 8-9.9V5l-8-3Z\"\u003e\u003c\/path\u003e\u003cpath d=\"M8.5 12.3 10.8 14.6 15.5 9.9\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003ch4\u003eUL 9540-Eligible Pairing\u003c\/h4\u003e\n\u003cp\u003eThis battery and inverter combination is built and certified to be paired together for grid-tied energy storage system installs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"efb-feature\"\u003e\n\u003csvg aria-hidden=\"true\" stroke-linecap=\"round\" stroke-width=\"1.7\" stroke=\"currentColor\" fill=\"none\" viewbox=\"0 0 24 24\"\u003e\u003ccircle r=\"2.5\" cy=\"12\" cx=\"6\"\u003e\u003c\/circle\u003e\u003ccircle r=\"2.5\" cy=\"12\" cx=\"18\"\u003e\u003c\/circle\u003e\u003cpath stroke-dasharray=\"2 2\" d=\"M8.5 12h7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003ch4\u003eGridBOSS Integration\u003c\/h4\u003e\n\u003cp\u003eConnects with EG4's GridBOSS hub for smart load management, AC coupling, and generator support at a system level.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"efb-feature\"\u003e\n\u003csvg aria-hidden=\"true\" stroke-linejoin=\"round\" stroke-linecap=\"round\" stroke-width=\"1.7\" stroke=\"currentColor\" fill=\"none\" viewbox=\"0 0 24 24\"\u003e\u003cpath d=\"M4 20v-3M9 20v-7M14 20v-11M19 20V4\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003ch4\u003eWiFi, Cellular \u0026amp; Ethernet\u003c\/h4\u003e\n\u003cp\u003eThe inverter ships with a WiFi dongle included by default, plus cellular and Ethernet connectivity options for remote monitoring.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"efb-feature\"\u003e\n\u003csvg aria-hidden=\"true\" stroke-linejoin=\"round\" stroke-linecap=\"round\" stroke-width=\"1.7\" stroke=\"currentColor\" fill=\"none\" viewbox=\"0 0 24 24\"\u003e\u003crect rx=\"1.5\" height=\"12\" width=\"18\" y=\"5\" x=\"3\"\u003e\u003c\/rect\u003e\u003cpath d=\"M8 20h8M12 17v3\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003ch4\u003eAuto-ID, 3rd-Gen BMS\u003c\/h4\u003e\n\u003cp\u003eThe battery automatically recognizes and syncs additional units during setup, with improved balancing precision and response time.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"efb-feature\"\u003e\n\u003csvg aria-hidden=\"true\" stroke-width=\"1.7\" stroke=\"currentColor\" fill=\"none\" viewbox=\"0 0 24 24\"\u003e\u003crect transform=\"rotate(-18 7 12)\" rx=\"3\" height=\"6\" width=\"9\" y=\"9\" x=\"2.5\"\u003e\u003c\/rect\u003e\u003crect transform=\"rotate(-18 17 12)\" rx=\"3\" height=\"6\" width=\"9\" y=\"9\" x=\"12.5\"\u003e\u003c\/rect\u003e\u003c\/svg\u003e\n\u003ch4\u003eParallels Up to 16 Units\u003c\/h4\u003e\n\u003cp\u003eScales from this single-inverter configuration up to large residential or commercial-style installations on the same platform.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003cdiv aria-hidden=\"true\" style=\"background: var(--ink-2); color: var(--accent); opacity: 0.7;\" class=\"efb-divider\"\u003e\u003csvg preserveaspectratio=\"none\" viewbox=\"0 0 600 20\"\u003e\u003cpath stroke-linecap=\"round\" stroke-width=\"2\" stroke=\"currentColor\" fill=\"none\" d=\"M0,10 Q25,-4 50,10 T100,10 T150,10 T200,10 T250,10 T300,10 T350,10 T400,10 T450,10 T500,10 T550,10 T600,10\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\u003c\/div\u003e\n\u003c!-- ============ NARRATIVE ============ --\u003e\n\u003csection class=\"efb-narrative\"\u003e\n\u003ch3\u003eOne Number Isn't the Whole Story\u003c\/h3\u003e\n\u003cp\u003eThis system's output rating isn't a single number — 16kW is what the FlexBOSS21 delivers with solar and grid both contributing, while the battery on its own is rated for 6kW continuous. That distinction matters for sizing: a system that looks oversized on paper at \"16kW\" is really built around a 6kW battery-only floor, with solar and grid making up the difference the rest of the time. Add in 21kW of possible solar input across three MPPT trackers, and there's real headroom for larger or more complex roof layouts.\u003c\/p\u003e\n\u003cp\u003eThe battery and inverter are sold as a matched pair specifically because BigBattery has built and validated this exact combination for UL 9540-eligible grid-tied installs, with closed-loop communication handling coordination between the two automatically. The inverter connects over WiFi (dongle included), cellular, or Ethernet, and integrates with EG4's GridBOSS hub for whole-system load management if the install calls for it. The battery stays indoors (IP20), while the inverter's NEMA 4X enclosure is rated for outdoor installation if that's where it needs to go.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003c!-- ============ SPECS ============ --\u003e\n\u003csection class=\"efb-specs\"\u003e\n\u003ch3\u003eFull Specifications\u003c\/h3\u003e\n\u003cdiv class=\"efb-specs-block\"\u003e\n\u003cp class=\"efb-specs-block-title\"\u003eBattery — EG4 314Ah Indoor (×1)\u003c\/p\u003e\n\u003cdiv class=\"efb-spec-groups\"\u003e\n\u003cdiv class=\"efb-spec-group\"\u003e\n\u003ch4\u003eCapacity\u003c\/h4\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal voltage\u003c\/td\u003e\n\u003ctd\u003e51.2 Vdc\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal energy capacity\u003c\/td\u003e\n\u003ctd\u003e16 kWh\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUsable energy (80% DoD)\u003c\/td\u003e\n\u003ctd\u003e12.86 kWh\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRated capacity\u003c\/td\u003e\n\u003ctd\u003e314 Ah\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"efb-spec-group\"\u003e\n\u003ch4\u003eCharging \u0026amp; Discharge\u003c\/h4\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax continuous charge current\u003c\/td\u003e\n\u003ctd\u003e157 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax continuous discharge current\u003c\/td\u003e\n\u003ctd\u003e200 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eContinuous charge\/discharge power\u003c\/td\u003e\n\u003ctd\u003e8 kW \/ 10.2 kW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak power\u003c\/td\u003e\n\u003ctd\u003e12.8 kW (3 sec)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"efb-spec-group\"\u003e\n\u003ch4\u003eEnvironmental\u003c\/h4\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eCharging temp range\u003c\/td\u003e\n\u003ctd\u003e32–122°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDischarging temp range\u003c\/td\u003e\n\u003ctd\u003e-4–131°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnclosure rating\u003c\/td\u003e\n\u003ctd\u003eIP20 (indoor only)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"efb-spec-group\"\u003e\n\u003ch4\u003ePhysical \u0026amp; Warranty\u003c\/h4\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e293.2 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions (H×W×D)\u003c\/td\u003e\n\u003ctd\u003e34.1 × 18.1 × 9.6 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCycle life\u003c\/td\u003e\n\u003ctd\u003e10,000 @ 0.5C, 80% DoD\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e10 years or 10,000 cycles\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"efb-specs-block\"\u003e\n\u003cp class=\"efb-specs-block-title\"\u003eInverter — EG4 FlexBOSS21 (×1)\u003c\/p\u003e\n\u003cdiv class=\"efb-spec-groups\"\u003e\n\u003cdiv class=\"efb-spec-group\"\u003e\n\u003ch4\u003eOutput\u003c\/h4\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eContinuous output (PV + grid)\u003c\/td\u003e\n\u003ctd\u003e66.7A \/ 16 kW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eContinuous output (battery only)\u003c\/td\u003e\n\u003ctd\u003e50A \/ 6 kW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak power (0.5s \/ 1s)\u003c\/td\u003e\n\u003ctd\u003e24,000W \/ 18,000W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLocked rotor amps\u003c\/td\u003e\n\u003ctd\u003e195 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransfer time\u003c\/td\u003e\n\u003ctd\u003e20ms default \/ 10ms configurable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"efb-spec-group\"\u003e\n\u003ch4\u003eSolar Input\u003c\/h4\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eMPPT channels\u003c\/td\u003e\n\u003ctd\u003e3 (5 strings total)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRated current per MPPT\u003c\/td\u003e\n\u003ctd\u003e26A \/ 26A \/ 15A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRec. max solar array (STC)\u003c\/td\u003e\n\u003ctd\u003e21 kW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMPPT DC voltage range\u003c\/td\u003e\n\u003ctd\u003e120–440 Vdc\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax efficiency (PV to grid)\u003c\/td\u003e\n\u003ctd\u003e97%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"efb-spec-group\"\u003e\n\u003ch4\u003eBattery \u0026amp; Grid\u003c\/h4\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery voltage range\u003c\/td\u003e\n\u003ctd\u003e40–60 Vdc\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax charge\/discharge current\u003c\/td\u003e\n\u003ctd\u003e250 A DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax grid pass-through\u003c\/td\u003e\n\u003ctd\u003e90 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAC input \/ output breaker\u003c\/td\u003e\n\u003ctd\u003e90A \/ 80A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIdle consumption\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;65 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"efb-spec-group\"\u003e\n\u003ch4\u003ePhysical, Connectivity \u0026amp; Warranty\u003c\/h4\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions (H×W×D)\u003c\/td\u003e\n\u003ctd\u003e30.43 × 22.28 × 11.22 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e121 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnclosure rating\u003c\/td\u003e\n\u003ctd\u003eNEMA 4X\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnectivity\u003c\/td\u003e\n\u003ctd\u003eWiFi (included), cellular, Ethernet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax parallel units\u003c\/td\u003e\n\u003ctd\u003e16\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e10 years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp style=\"font-size: 12.5px; color: var(--muted) !important; margin-top: 18px !important;\"\u003eInverter certifications: UL 1741, UL 1741 PCS CRD Test, UL 3141. FCC Part 15 Class B. Battery certifications: UL 1973, UN 38.3.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003c!-- ============ SCALABILITY ============ --\u003e\n\u003csection class=\"efb-scale\"\u003e\n\u003ch3\u003eOther Configurations Available\u003c\/h3\u003e\n\u003cp\u003eThis same battery and inverter platform is sold in several sizes. The row below highlighted in your brand color is the configuration this page describes — everything else is shown for reference if a customer needs a different scale.\u003c\/p\u003e\n\u003ctable class=\"efb-scale-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eTier\u003c\/th\u003e\n\u003cth\u003eInverters\u003c\/th\u003e\n\u003cth\u003eBatteries\u003c\/th\u003e\n\u003cth\u003eCapacity\u003c\/th\u003e\n\u003cth\u003eMax Output\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"current\"\u003e\n\u003ctd class=\"tier\"\u003eStandard\u003c\/td\u003e\n\u003ctd\u003e1×\u003c\/td\u003e\n\u003ctd\u003e1×\u003c\/td\u003e\n\u003ctd\u003e16 kWh\u003c\/td\u003e\n\u003ctd\u003e16 kW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"tier\"\u003eStandard\u003c\/td\u003e\n\u003ctd\u003e1×\u003c\/td\u003e\n\u003ctd\u003e2×\u003c\/td\u003e\n\u003ctd\u003e32 kWh\u003c\/td\u003e\n\u003ctd\u003e16 kW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"tier\"\u003eStandard\u003c\/td\u003e\n\u003ctd\u003e1×\u003c\/td\u003e\n\u003ctd\u003e3×\u003c\/td\u003e\n\u003ctd\u003e48 kWh\u003c\/td\u003e\n\u003ctd\u003e16 kW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"tier\"\u003eLarge\u003c\/td\u003e\n\u003ctd\u003e2×\u003c\/td\u003e\n\u003ctd\u003e4×\u003c\/td\u003e\n\u003ctd\u003e64 kWh\u003c\/td\u003e\n\u003ctd\u003e32 kW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"tier\"\u003eLarge\u003c\/td\u003e\n\u003ctd\u003e2×\u003c\/td\u003e\n\u003ctd\u003e6×\u003c\/td\u003e\n\u003ctd\u003e96 kWh\u003c\/td\u003e\n\u003ctd\u003e32 kW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"tier\"\u003e3-Phase\u003c\/td\u003e\n\u003ctd\u003e3×\u003c\/td\u003e\n\u003ctd\u003e6×\u003c\/td\u003e\n\u003ctd\u003e96 kWh\u003c\/td\u003e\n\u003ctd\u003e48 kW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/section\u003e\n\u003c!-- ============ FAQ ============ --\u003e\n\u003csection class=\"efb-faq\"\u003e\n\u003ch3\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0566\/2418\/5399\/files\/EG4-314Ah-1024x420.webp?v=1785080293\" alt=\"A contemporary home fitted with solar panels is flanked by two tall, silver EG4 48V WallMount 16kWh Indoor Self-Heating Batteries (314Ah | UL9540A). Three sleek card-style icons—set in modern IBM Plex Sans—highlight long battery lifespan, ultra-quiet performance, and a 10-year warranty with U.S.-based support, all reflecting EG4’s commitment to quality.\"\u003e\u003c\/h3\u003e\n\u003ch3\u003e \u003c\/h3\u003e\n\u003ch3\u003eCommon Questions\u003c\/h3\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat exactly is included in this system?\u003c\/summary\u003e\n\u003cp\u003eOne EG4 314Ah Indoor battery (16kWh) and one EG4 FlexBOSS21 hybrid inverter, sold as a pre-matched, UL 9540-eligible pair.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs the output really 16kW, or is that only with solar?\u003c\/summary\u003e\n\u003cp\u003e16kW is what the system delivers with solar and grid both contributing. On battery power alone, with no solar or grid available, continuous output is 6kW. Worth sizing around the 6kW floor if backup power without sun or grid matters for your use case.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat does \"UL 9540-eligible\" mean here?\u003c\/summary\u003e\n\u003cp\u003eIt means this specific battery-and-inverter pairing has been built and validated together for UL 9540 grid-tied energy storage system installs, rather than being a generic combination assembled after the fact.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan the whole system be installed outdoors?\u003c\/summary\u003e\n\u003cp\u003eNot the battery — it's IP20 and indoor-rated. The FlexBOSS21 inverter is NEMA 4X and can go outdoors if that placement makes more sense for the install.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I monitor the system remotely?\u003c\/summary\u003e\n\u003cp\u003eThe inverter includes a WiFi dongle by default and also supports cellular and Ethernet connectivity, with app and web-based monitoring.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat's the warranty?\u003c\/summary\u003e\n\u003cp\u003e10 years on both the battery (or 10,000 cycles) and the inverter, covering defects in materials and workmanship.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo I need a licensed electrician to install it?\u003c\/summary\u003e\n\u003cp\u003eGiven the voltages, currents, and grid interconnection involved, installation should be handled by a qualified, licensed electrician or solar installer familiar with your local code and utility requirements.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003c\/section\u003e\n\u003c!-- ============ DOWNLOADS ============ --\u003e\n\u003csection class=\"efb-downloads\"\u003e\n\u003ch3\u003eDocuments \u0026amp; Downloads\u003c\/h3\u003e\n\u003cdiv class=\"efb-dl-block\"\u003e\n\u003cp class=\"efb-dl-group-title\"\u003eBattery — EG4 314Ah Indoor\u003c\/p\u003e\n\u003cdiv class=\"efb-download-list\"\u003e\n\u003ca rel=\"noopener\" href=\"https:\/\/eg4electronics.com\/wp-content\/uploads\/2025\/10\/EG4-WallMount-314Ah-Indoor-Battery-Spec-Sheet.pdf\" class=\"efb-download\" target=\"_blank\"\u003e \u003csvg aria-hidden=\"true\" stroke-linejoin=\"round\" stroke-linecap=\"round\" stroke-width=\"1.7\" stroke=\"currentColor\" fill=\"none\" viewbox=\"0 0 24 24\"\u003e\u003cpath d=\"M12 3v12M7 10l5 5 5-5M4 19h16\"\u003e\u003c\/path\u003e\u003c\/svg\u003e Spec Sheet \u003c\/a\u003e \u003ca rel=\"noopener\" href=\"https:\/\/eg4electronics.com\/wp-content\/uploads\/2025\/04\/EG4-WallMount-Indoor-314Ah-Battery-User-Manual.pdf\" class=\"efb-download\" target=\"_blank\"\u003e \u003csvg aria-hidden=\"true\" stroke-linejoin=\"round\" stroke-linecap=\"round\" stroke-width=\"1.7\" stroke=\"currentColor\" fill=\"none\" viewbox=\"0 0 24 24\"\u003e\u003cpath d=\"M12 3v12M7 10l5 5 5-5M4 19h16\"\u003e\u003c\/path\u003e\u003c\/svg\u003e User Manual \u003c\/a\u003e \u003ca rel=\"noopener\" href=\"https:\/\/eg4electronics.com\/wp-content\/uploads\/2025\/10\/EG4-WallMount-314Ah-Indoor-Battery-Quick-Start-Guide.pdf\" class=\"efb-download\" target=\"_blank\"\u003e \u003csvg aria-hidden=\"true\" stroke-linejoin=\"round\" stroke-linecap=\"round\" stroke-width=\"1.7\" stroke=\"currentColor\" fill=\"none\" viewbox=\"0 0 24 24\"\u003e\u003cpath d=\"M12 3v12M7 10l5 5 5-5M4 19h16\"\u003e\u003c\/path\u003e\u003c\/svg\u003e Quick Start Guide \u003c\/a\u003e \u003ca rel=\"noopener\" href=\"https:\/\/bigbattery.com\/wp-content\/uploads\/2026\/01\/EG4-WallMount-314Ah-Indoor-Battery-1973-Certificate-of-Compliance.pdf\" class=\"efb-download\" target=\"_blank\"\u003e \u003csvg aria-hidden=\"true\" stroke-linejoin=\"round\" stroke-linecap=\"round\" stroke-width=\"1.7\" stroke=\"currentColor\" fill=\"none\" viewbox=\"0 0 24 24\"\u003e\u003cpath d=\"M12 3v12M7 10l5 5 5-5M4 19h16\"\u003e\u003c\/path\u003e\u003c\/svg\u003e Certificate of Compliance \u003c\/a\u003e \u003ca rel=\"noopener\" href=\"https:\/\/bigbattery.com\/wp-content\/uploads\/2026\/01\/EG4-WallMount-314Ah-Indoor-Battery-UL-9540A-Test-Verification-of-Conformity.pdf\" class=\"efb-download\" target=\"_blank\"\u003e \u003csvg aria-hidden=\"true\" stroke-linejoin=\"round\" stroke-linecap=\"round\" stroke-width=\"1.7\" stroke=\"currentColor\" fill=\"none\" viewbox=\"0 0 24 24\"\u003e\u003cpath d=\"M12 3v12M7 10l5 5 5-5M4 19h16\"\u003e\u003c\/path\u003e\u003c\/svg\u003e Certificate of Conformity \u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"efb-dl-block\"\u003e\n\u003cp class=\"efb-dl-group-title\"\u003eInverter — EG4 FlexBOSS21\u003c\/p\u003e\n\u003cdiv class=\"efb-download-list\"\u003e\n\u003ca rel=\"noopener\" href=\"https:\/\/eg4electronics.com\/wp-content\/uploads\/2024\/10\/EG4-FlexBoss21-Spec-Sheet.pdf\" class=\"efb-download\" target=\"_blank\"\u003e \u003csvg aria-hidden=\"true\" stroke-linejoin=\"round\" stroke-linecap=\"round\" stroke-width=\"1.7\" stroke=\"currentColor\" fill=\"none\" viewbox=\"0 0 24 24\"\u003e\u003cpath d=\"M12 3v12M7 10l5 5 5-5M4 19h16\"\u003e\u003c\/path\u003e\u003c\/svg\u003e Spec Sheet \u003c\/a\u003e \u003ca rel=\"noopener\" href=\"https:\/\/eg4electronics.com\/wp-content\/uploads\/2024\/08\/FlexBOSS-21-Manual.pdf\" class=\"efb-download\" target=\"_blank\"\u003e \u003csvg aria-hidden=\"true\" stroke-linejoin=\"round\" stroke-linecap=\"round\" stroke-width=\"1.7\" stroke=\"currentColor\" fill=\"none\" viewbox=\"0 0 24 24\"\u003e\u003cpath d=\"M12 3v12M7 10l5 5 5-5M4 19h16\"\u003e\u003c\/path\u003e\u003c\/svg\u003e User Manual \u003c\/a\u003e \u003ca rel=\"noopener\" href=\"https:\/\/eg4electronics.com\/wp-content\/uploads\/2024\/11\/EG4-FlexBoss21-COC.pdf\" class=\"efb-download\" target=\"_blank\"\u003e \u003csvg aria-hidden=\"true\" stroke-linejoin=\"round\" stroke-linecap=\"round\" stroke-width=\"1.7\" stroke=\"currentColor\" fill=\"none\" viewbox=\"0 0 24 24\"\u003e\u003cpath d=\"M12 3v12M7 10l5 5 5-5M4 19h16\"\u003e\u003c\/path\u003e\u003c\/svg\u003e UL1741 Certificate \u003c\/a\u003e \u003ca rel=\"noopener\" href=\"https:\/\/eg4electronics.com\/wp-content\/uploads\/2024\/11\/EG4-FlexBOSS21-UL-1741-PCS-CRD_Test-Verification-of-Conformity.pdf\" class=\"efb-download\" target=\"_blank\"\u003e \u003csvg aria-hidden=\"true\" stroke-linejoin=\"round\" stroke-linecap=\"round\" stroke-width=\"1.7\" stroke=\"currentColor\" fill=\"none\" viewbox=\"0 0 24 24\"\u003e\u003cpath d=\"M12 3v12M7 10l5 5 5-5M4 19h16\"\u003e\u003c\/path\u003e\u003c\/svg\u003e UL1741 PCS CRD Verification \u003c\/a\u003e \u003ca rel=\"noopener\" href=\"https:\/\/eg4electronics.com\/wp-content\/uploads\/2025\/08\/EG4-FlexBOSS21-FlexBOSS18-UL-3141-CRD-PCS-Verification-of-Conformity.pdf\" class=\"efb-download\" target=\"_blank\"\u003e \u003csvg aria-hidden=\"true\" stroke-linejoin=\"round\" stroke-linecap=\"round\" stroke-width=\"1.7\" stroke=\"currentColor\" fill=\"none\" viewbox=\"0 0 24 24\"\u003e\u003cpath d=\"M12 3v12M7 10l5 5 5-5M4 19h16\"\u003e\u003c\/path\u003e\u003c\/svg\u003e UL3141 Certificate \u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003c!-- ============ FOOTER ============ --\u003e\n\u003csection class=\"efb-footer\"\u003e\n\u003cp class=\"efb-warranty\"\u003eBattery and inverter both backed by \u003cstrong\u003e10-year manufacturer's warranties\u003c\/strong\u003e, covering defects in materials and workmanship.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003c\/div\u003e","brand":"EG4","offers":[{"title":"1 inverter + 1 battery (16kW + 16kWh)","offer_id":42333854138423,"sku":"K0210","price":7092.0,"currency_code":"USD","in_stock":true},{"title":"1 inverter + 2 batteries (16kW + 32kWh)","offer_id":42333854171191,"sku":"K0211","price":10750.0,"currency_code":"USD","in_stock":true},{"title":"1 inverter + 3 batteries (16kW + 48kWh)","offer_id":42333854203959,"sku":"K0212","price":14408.0,"currency_code":"USD","in_stock":true},{"title":"2 inverters + 4 batteries (32kW + 64kWh)","offer_id":42333854236727,"sku":"K0213","price":21666.0,"currency_code":"USD","in_stock":true},{"title":"2 inverters + 6 batteries (32kW + 96kWh)","offer_id":42333854269495,"sku":"K0214","price":28982.0,"currency_code":"USD","in_stock":true},{"title":"3 inverters + 6 batteries (48kW + 96kWh)","offer_id":42333854302263,"sku":"K0215","price":32582.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0566\/2418\/5399\/files\/FLEXBOSS21-EG4-314Ah-2.webp?v=1785084900","url":"https:\/\/ecosolarkits.com\/products\/eg4-wallmount-48v-16kwh-indoor-battery-ess-314ah-eg4-flexboss21-hybrid-inverter-grid-tied-system","provider":"Eco Solar Kits","version":"1.0","type":"link"}