{"product_id":"eg4-flexboss18-18kw-split-phase-hybrid-solar-inverter","title":"EG4 FlexBOSS18 18kW Split-Phase Hybrid Solar Inverter","description":"\u003cstyle\u003e\n.flexboss18-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.flexboss18-pd, .flexboss18-pd *, .flexboss18-pd *::before, .flexboss18-pd *::after { box-sizing: border-box; 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}\n.fb18-compat li { font-family: var(--font-mono) !important; font-size: 13.3px; padding-left: 18px; position: relative; }\n.fb18-compat li::before { content: ''; position: absolute; left: 0; top: 6px; width: 8px; height: 8px; background: var(--accent-2); border-radius: 2px; }\n\n\/* FAQ *\/\n.fb18-faq { padding: 42px 32px; background: var(--paper); }\n.fb18-faq details { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 2px 18px; margin-bottom: 10px; }\n.fb18-faq summary { cursor: pointer; font-weight: 600; font-size: 14.8px; padding: 15px 24px 15px 0; list-style: none; position: relative; }\n.fb18-faq summary::-webkit-details-marker { display: none; }\n.fb18-faq summary::after { content: '+'; position: absolute; right: 0; top: 13px; font-size: 19px; color: var(--accent) !important; }\n.fb18-faq details[open] summary::after { content: '\\2013'; }\n.fb18-faq details p { padding: 0 0 16px; color: var(--muted) !important; font-size: 13.8px; max-width: 70ch; }\n\n\/* Downloads *\/\n.fb18-downloads { padding: 42px 32px; background: var(--card); }\n.fb18-download-list { display: flex; flex-wrap: wrap; gap: 12px; }\n.flexboss18-pd .fb18-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.flexboss18-pd .fb18-download:hover { border-color: var(--accent) !important; background: var(--paper); }\n.fb18-download svg { width: 18px; height: 18px; color: var(--accent) !important; flex-shrink: 0; }\n\n\/* Footer *\/\n.fb18-footer { padding: 26px 32px; background: var(--ink); color: var(--text-light); }\n.flexboss18-pd .fb18-warranty { font-size: 14px; color: var(--text-light) !important; }\n.flexboss18-pd .fb18-warranty strong { color: var(--accent) !important; }\n\u003c\/style\u003e\n\u003cdiv class=\"flexboss18-pd\"\u003e\n\u003c!-- ============ HERO ============ --\u003e\n\u003csection class=\"fb18-hero\"\u003e\n\u003cp class=\"fb18-eyebrow\"\u003e48V Hybrid Inverter · Dual MPPT · Built-In 4G · UL 9540\u003c\/p\u003e\n\u003ch2\u003e13,000 Watts of Hybrid Power, With Built-In 4G Connectivity\u003c\/h2\u003e\n\u003cp class=\"fb18-lead\"\u003eThe EG4 FlexBOSS18 is rated for 13,000W of continuous output, backed by up to 18,000W of PV input across two MPPT trackers and four solar strings. It works grid-tied or fully off-grid, integrates with EG4's GridBOSS energy management hub, and connects over Wi-Fi or built-in 4G — useful anywhere a reliable internet connection isn't a given. Backed by a 10-year manufacturer's warranty inside a NEMA 4X all-weather enclosure.\u003c\/p\u003e\n\u003cdiv aria-hidden=\"true\" class=\"fb18-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=\"fb18-stats\"\u003e\n\u003cdiv class=\"fb18-stat\"\u003e\n\u003cspan class=\"num\"\u003e13,000W\u003c\/span\u003e\u003cspan class=\"label\"\u003eContinuous Output\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fb18-stat\"\u003e\n\u003cspan class=\"num\"\u003e18,000W\u003c\/span\u003e\u003cspan class=\"label\"\u003eMax Solar Input\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fb18-stat\"\u003e\n\u003cspan class=\"num\"\u003e2 MPPT\u003c\/span\u003e\u003cspan class=\"label\"\u003e4 Solar Strings\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fb18-stat\"\u003e\n\u003cspan class=\"num\"\u003e10-Year\u003c\/span\u003e\u003cspan class=\"label\"\u003eWarranty\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003c!-- ============ FEATURES ============ --\u003e\n\u003csection class=\"fb18-features\"\u003e\n\u003ch3\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0566\/2418\/5399\/files\/FlexBoss18-Simple-System-Expansion-Final-scaled-1-2048x820.webp?v=1784841079\" alt=\"Five white battery units connect to a central EG4 FlexBOSS18 18kW Split-Phase Hybrid Solar Inverter, demonstrating easy system scalability and streamlined installation with an optional conduit box. Blue arrows and labels emphasize integration features, while subtle box shadows enhance the clarity of each EG4 component in the display.\"\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\u003ch3\u003e\u003c\/h3\u003e\n\u003ch3\u003eWhat Makes the FlexBOSS18 Different\u003c\/h3\u003e\n\u003cdiv class=\"fb18-feature-grid\"\u003e\n\u003cdiv class=\"fb18-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\u003e13,000W Continuous Output\u003c\/h4\u003e\n\u003cp\u003eRated for 13,000W continuously, with peak power up to 20,000W for half a second to cover large motor starts.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fb18-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\u003e18kW Solar, Dual MPPT\u003c\/h4\u003e\n\u003cp\u003eTwo MPPT trackers split across four total input strings, pulling up to 18,000W utilized from the array.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fb18-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\u003eBuilt-In 4G Connectivity\u003c\/h4\u003e\n\u003cp\u003eCommunicates over RS485, CANBus, Wi-Fi, or built-in 4G — remote monitoring stays online even without a local Wi-Fi network.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fb18-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 directly to 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=\"fb18-feature\"\u003e\n\u003csvg aria-hidden=\"true\" stroke-linecap=\"round\" stroke-width=\"1.7\" stroke=\"currentColor\" fill=\"none\" viewbox=\"0 0 24 24\"\u003e\u003cpath d=\"M9 2v4M15 2v4M7 8h10v4a5 5 0 0 1-10 0V8Z\"\u003e\u003c\/path\u003e\u003cpath d=\"M12 17v4\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003ch4\u003e90A Grid Feed-Through\u003c\/h4\u003e\n\u003cp\u003eHandles high-demand loads and grid integration with headroom beyond what most residential hybrid inverters offer.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fb18-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 7h13M13 3l4 4-4 4M20 17H7M11 21l-4-4 4-4\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003ch4\u003eHybrid: Grid-Tied or Off-Grid\u003c\/h4\u003e\n\u003cp\u003eUL 9540 certified for both grid-tied and off-grid installs with compatible batteries — the same unit covers either path.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fb18-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=\"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 stroke=\"none\" fill=\"currentColor\" d=\"M12 8c-1.5 2-2.5 3.3-2.5 4.5a2.5 2.5 0 0 0 5 0C14.5 11.3 13.5 10 12 8Z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003ch4\u003eNEMA 4X All-Weather\u003c\/h4\u003e\n\u003cp\u003eRated for direct outdoor installation and built to keep running through rain and snow, not just covered or indoor spaces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fb18-feature\"\u003e\n\u003csvg aria-hidden=\"true\" stroke-width=\"1.7\" stroke=\"currentColor\" fill=\"none\" viewbox=\"0 0 24 24\" class=\"fb18-accent-2\"\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 10 Units\u003c\/h4\u003e\n\u003cp\u003eScales from a single large home up to bigger residential or light commercial 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=\"fb18-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=\"fb18-narrative\"\u003e\n\u003ch3\u003eThe Mid-Tier Hybrid, With a Connectivity Edge\u003c\/h3\u003e\n\u003cp\u003eThe FlexBOSS18 sits between EG4's 12kPV and FlexBOSS21 by power — 13,000W continuous output and up to 18,000W of PV input across two MPPT trackers and four strings. What it adds that the larger FlexBOSS21 doesn't list is built-in 4G connectivity alongside Wi-Fi, which matters for installs in areas with unreliable or absent local internet: remote monitoring and alerts keep working over cellular instead of depending on a home network staying up.\u003c\/p\u003e\n\u003cp\u003eLike the rest of EG4's hybrid line, it's UL 9540 certified for both grid-tied and off-grid installs with BigBattery ETHOS or EG4 batteries, integrates with EG4's GridBOSS hub for system-level load management and AC coupling, and ships in a NEMA 4X enclosure rated for direct outdoor installation. A 10-year manufacturer's warranty and up to 10 parallel units round out a unit built for serious residential systems that don't quite need the FlexBOSS21's full scale.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003c!-- ============ SPECS ============ --\u003e\n\u003csection class=\"fb18-specs\"\u003e\n\u003ch3\u003eFull Specifications\u003c\/h3\u003e\n\u003cdiv class=\"fb18-spec-groups\"\u003e\n\u003cdiv class=\"fb18-spec-group\"\u003e\n\u003ch4\u003eOutput\u003c\/h4\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eContinuous output power\u003c\/td\u003e\n\u003ctd\u003e13,000 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput voltage\u003c\/td\u003e\n\u003ctd\u003e120\/240V, 120\/208V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax AC current\u003c\/td\u003e\n\u003ctd\u003e54A @ 240V\/208V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax output current\u003c\/td\u003e\n\u003ctd\u003e66.7 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak power (0.5s \/ 1s)\u003c\/td\u003e\n\u003ctd\u003e20,000W \/ 15,000W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower factor\u003c\/td\u003e\n\u003ctd\u003e0.99 (full load)\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=\"fb18-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\u003e2 (4 strings total)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax utilized PV power\u003c\/td\u003e\n\u003ctd\u003e18,000 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax usable input current\u003c\/td\u003e\n\u003ctd\u003e26A + 26A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDC input voltage range\u003c\/td\u003e\n\u003ctd\u003e100–600 Vdc\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMPPT 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\u003e97.5%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fb18-spec-group\"\u003e\n\u003ch4\u003eBattery \u0026amp; Grid\u003c\/h4\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal battery voltage\u003c\/td\u003e\n\u003ctd\u003e48 Vdc\u003c\/td\u003e\n\u003c\/tr\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 power\u003c\/td\u003e\n\u003ctd\u003e10,000 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRec. battery capacity\/inverter\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;300 Ah\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax AC bypass\u003c\/td\u003e\n\u003ctd\u003e90 A\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=\"fb18-spec-group\"\u003e\n\u003ch4\u003ePhysical \u0026amp; Environmental\u003c\/h4\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions (D×W×H)\u003c\/td\u003e\n\u003ctd\u003e11.2 × 22.8 × 30.5 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e115 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnclosure rating\u003c\/td\u003e\n\u003ctd\u003eNEMA 4X (all-weather)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating temperature\u003c\/td\u003e\n\u003ctd\u003e-13°F to 140°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNoise level\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;50 dB @ 3 ft\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDesign topology\u003c\/td\u003e\n\u003ctd\u003eHigh-frequency, transformerless\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fb18-spec-group\"\u003e\n\u003ch4\u003eConnectivity \u0026amp; Warranty\u003c\/h4\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication\u003c\/td\u003e\n\u003ctd\u003eRS485 \/ CANBus \/ Wi-Fi \/ 4G\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax parallel units\u003c\/td\u003e\n\u003ctd\u003e10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand \/ model\u003c\/td\u003e\n\u003ctd\u003eEG4 FlexBOSS18\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\u003cp style=\"font-size: 12.5px; color: var(--muted) !important; margin-top: 18px !important;\"\u003eCertification: UL 1741, UL 9540.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003c!-- ============ COMPATIBILITY ============ --\u003e\n\u003csection class=\"fb18-compat\"\u003e\n\u003ch3\u003eBattery Compatibility\u003c\/h3\u003e\n\u003cp\u003eUL 9540 certified with closed-loop communication for both grid-tied and off-grid installs, when paired with:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eBigBattery ETHOS\u003c\/li\u003e\n\u003cli\u003eEG4 280Ah All-Weather \/ Indoor\u003c\/li\u003e\n\u003cli\u003eEG4 314Ah All-Weather \/ Indoor\u003c\/li\u003e\n\u003cli\u003eRecommended: \u0026gt;300Ah per inverter\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e\n\u003c!-- ============ FAQ ============ --\u003e\n\u003csection class=\"fb18-faq\"\u003e\n\u003ch3\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0566\/2418\/5399\/files\/All-EG4-scaled-1-2048x820.webp?v=1784837285\" alt=\"Promotional image showcasing the Eco Solar Kits lineup—including the EG4 FlexBOSS21 21kW Split-Phase Hybrid Solar Inverter—featuring product photos and concise descriptions on a clean white card background. The modern layout is enhanced by crisp IBM Plex Sans typography.\"\u003e\u003c\/h3\u003e\n\u003ch3\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0566\/2418\/5399\/files\/FlexBoss21-allweather-gridboss.webp?v=1784837304\" alt=\"A car sits in a garage at night alongside energy storage devices; on the right, features of the EG4 FlexBOSS21 21kW Split-Phase Hybrid Solar Inverter by Eco Solar Kits are neatly displayed in crisp IBM Plex Sans font: smart control, grid cell integration, surge capacity, self-sufficiency, and value solution—all elegantly presented within sleek panels featuring rounded corners.\"\u003e\u003c\/h3\u003e\n\u003ch3\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0566\/2418\/5399\/files\/EG4-Inverter-Certification-scaled-2-2048x820.webp?v=1784837324\" alt=\"A professional reviews UL safety certificates for inverters on a screen displayed against a sleek card backdrop. In modern IBM Plex Sans, the text announces: “Certified to Highest UL Safety Standards, UL1741: EG4 FlexBOSS21 21kW Split-Phase Hybrid Solar Inverter.” The Intertek and ETL logos appear on the left, underscoring Eco Solar Kits' 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's the difference between continuous and peak power?\u003c\/summary\u003e\n\u003cp\u003e13,000W is what the FlexBOSS18 delivers continuously. Peak power goes higher for short bursts — up to 20,000W for half a second, tapering down to 11,000W over 12 minutes — which covers the brief surge a motor or compressor needs to start without requiring that much power all the time.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDoes this include cellular data, or just Wi-Fi?\u003c\/summary\u003e\n\u003cp\u003eBoth — it communicates over RS485, CANBus, Wi-Fi, and built-in 4G. The 4G option matters for installs where a reliable local Wi-Fi network isn't available; remote monitoring and alerts can run over cellular instead.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat's the GridBOSS, and do I need one?\u003c\/summary\u003e\n\u003cp\u003eThe EG4 GridBOSS is a separate energy management hub (sold separately) that adds smart load management, AC coupling, and generator support at a whole-system level. It's an optional add-on — the FlexBOSS18 runs as a complete inverter on its own.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan it really be installed outdoors?\u003c\/summary\u003e\n\u003cp\u003eYes — it carries a NEMA 4X enclosure rating, built for direct exposure to rain and snow, unlike IP20-rated inverters that require an indoor or fully enclosed location.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat batteries does it work with?\u003c\/summary\u003e\n\u003cp\u003eIt's UL 9540 certified for both grid-tied and off-grid installs with BigBattery ETHOS and EG4 batteries, with at least 300Ah of recommended capacity per inverter.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill it run my entire house?\u003c\/summary\u003e\n\u003cp\u003eIt depends on your total connected load. At 13,000W continuous, it covers most homes comfortably, but a full load calculation is worth doing before sizing your system, especially for larger properties with heavy HVAC or well pump draw.\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 and currents involved, and the added complexity of a grid-interactive hybrid system, installation should be handled by a qualified, licensed electrician or solar installer familiar with your local code and utility interconnection requirements.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003c\/section\u003e\n\u003c!-- ============ DOWNLOADS ============ --\u003e\n\u003csection class=\"fb18-downloads\"\u003e\n\u003ch3\u003eDocuments \u0026amp; Downloads\u003c\/h3\u003e\n\u003cdiv class=\"fb18-download-list\"\u003e\n\u003ca rel=\"noopener\" href=\"https:\/\/bigbattery.com\/wp-content\/uploads\/2025\/05\/EG4-FlexBOSS18-Hybrid-Inverter-Spec-Sheet.pdf\" class=\"fb18-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:\/\/bigbattery.com\/wp-content\/uploads\/2025\/05\/EG4-FlexBOSS18-Hybrid-Inverter-User-Manual.pdf\" class=\"fb18-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:\/\/bigbattery.com\/wp-content\/uploads\/2025\/05\/EG4-FlexBOSS18-UL-1741-Certificate-of-Compliance.pdf\" class=\"fb18-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\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003c!-- ============ FOOTER ============ --\u003e\n\u003csection class=\"fb18-footer\"\u003e\n\u003cp class=\"fb18-warranty\"\u003eBacked by a \u003cstrong\u003e10-year manufacturer's warranty\u003c\/strong\u003e covering defects in materials and workmanship.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003c\/div\u003e","brand":"EG4","offers":[{"title":"Default Title","offer_id":42331566080055,"sku":"INV031","price":3199.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0566\/2418\/5399\/files\/FLEXBOSS18-3.webp?v=1784841030","url":"https:\/\/ecosolarkits.com\/products\/eg4-flexboss18-18kw-split-phase-hybrid-solar-inverter","provider":"Eco Solar Kits","version":"1.0","type":"link"}