{"product_id":"eg4-flexboss21-hybrid-solar-inverter-21kw-pv-16kw-ac-split-phase-4-mppt-scalable-remote-wi-fi-monitoring-inv027","title":"EG4 | FlexBOSS21 Hybrid Solar Inverter | 21kW PV \/ 16kW AC | Split-Phase | 4-MPPT | Scalable | Remote Wi-Fi Monitoring | INV027","description":"\u003ch2\u003eEG4 FlexBOSS21 Hybrid Inverter \u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eEG4 FlexBOSS21 Hybrid Inverter\u003c\/strong\u003e is a high-capacity, next-generation energy solution designed for \u003cstrong\u003eadvanced residential and commercial solar systems\u003c\/strong\u003e. With up to \u003cstrong\u003e21,000W of usable PV array capacity\u003c\/strong\u003e and \u003cstrong\u003e16,000W of split-phase 120\/240V output power\u003c\/strong\u003e, the FlexBOSS21 provides the performance and flexibility needed for demanding on-grid, hybrid, and off-grid applications. Its 48V battery architecture and high-power design make it well suited for large-scale energy storage and backup applications.\u003c\/p\u003e\n\u003cp\u003eThe FlexBOSS21 features \u003cstrong\u003e3 MPPT inputs supporting up to 5 strings\u003c\/strong\u003e, allowing for flexible solar array configurations and efficient energy harvesting. It supports a \u003cstrong\u003e100–600V DC input range\u003c\/strong\u003e, with an MPPT operating range of \u003cstrong\u003e120–440V DC\u003c\/strong\u003e, and can utilize up to \u003cstrong\u003e21,000W of PV array power\u003c\/strong\u003e with a maximum recommended PV input of \u003cstrong\u003e25,000W\u003c\/strong\u003e. With a maximum efficiency of \u003cstrong\u003e97% for PV-to-grid\u003c\/strong\u003e, \u003cstrong\u003e94.5% for PV-to-battery\u003c\/strong\u003e, and \u003cstrong\u003e94% for battery-to-grid\u003c\/strong\u003e, the inverter is designed to make efficient use of available solar and stored energy.\u003c\/p\u003e\n\u003ch3\u003ePowerful Output \u0026amp; Grid Integration\u003c\/h3\u003e\n\u003cp\u003eThe FlexBOSS21 provides \u003cstrong\u003e12,000W of nominal output power without PV\u003c\/strong\u003e and up to \u003cstrong\u003e16,000W of output power with PV at 240V\u003c\/strong\u003e. It supports \u003cstrong\u003e120\/240V AC split-phase output\u003c\/strong\u003e and offers a \u003cstrong\u003e90A maximum AC bypass\u003c\/strong\u003e, allowing it to accommodate high-demand electrical systems. The inverter also delivers peak power capabilities of up to \u003cstrong\u003e24,000W for 0.5 seconds\u003c\/strong\u003e, \u003cstrong\u003e18,000W for 1 second\u003c\/strong\u003e, and \u003cstrong\u003e15,000W for 6 minutes\u003c\/strong\u003e, providing additional capacity for demanding loads and startup requirements.\u003c\/p\u003e\n\u003cp\u003eWith \u003cstrong\u003e90A grid feed-through\u003c\/strong\u003e, the FlexBOSS21 can integrate with larger electrical systems while supporting advanced energy management. Its \u003cstrong\u003e0.99 power factor at full load\u003c\/strong\u003e, adjustable reactive power range of \u003cstrong\u003e-0.8 to 0.8\u003c\/strong\u003e, and less than \u003cstrong\u003e5% total harmonic distortion\u003c\/strong\u003e help provide stable and efficient power delivery.\u003c\/p\u003e\n\u003ch3\u003eAdvanced Solar \u0026amp; Battery Management\u003c\/h3\u003e\n\u003cp\u003eThe inverter operates with a \u003cstrong\u003e48V DC nominal battery voltage\u003c\/strong\u003e and supports a voltage range of \u003cstrong\u003e40–60V DC\u003c\/strong\u003e. It provides up to \u003cstrong\u003e12,000W of maximum battery charge\/discharge power\u003c\/strong\u003e and recommends a battery capacity of more than \u003cstrong\u003e300Ah per inverter\u003c\/strong\u003e. The system is compatible with \u003cstrong\u003e48V battery systems\u003c\/strong\u003e and supports \u003cstrong\u003eBigBattery ETHOS and EG4 Batteries\u003c\/strong\u003e with closed-loop communication.\u003c\/p\u003e\n\u003cp\u003eThe FlexBOSS21 also supports \u003cstrong\u003eAC coupling\u003c\/strong\u003e, making it useful for system upgrades and retrofits. When integrated with the \u003cstrong\u003eEG4 GridBOSS MID\u003c\/strong\u003e, it enables advanced capabilities such as \u003cstrong\u003esmart load management, generator support, and intelligent energy distribution\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch3\u003eSmart Monitoring \u0026amp; Safety\u003c\/h3\u003e\n\u003cp\u003eBuilt-in \u003cstrong\u003eWi-Fi connectivity, RS485, CANBus, and remote monitoring\u003c\/strong\u003e provide convenient access to system information and performance data. Users can monitor their energy system and receive mobile alerts, helping provide greater visibility and control.\u003c\/p\u003e\n\u003cp\u003eFor enhanced safety, the FlexBOSS21 includes \u003cstrong\u003erapid shutdown, ground fault protection, and arc fault protection\u003c\/strong\u003e. Its \u003cstrong\u003eIP65\/NEMA 4X protection rating\u003c\/strong\u003e helps protect the unit in demanding environments. The inverter is designed to operate and be stored in temperatures ranging from \u003cstrong\u003e-13°F to 140°F (-25°C to 60°C)\u003c\/strong\u003e and at altitudes up to \u003cstrong\u003e6,561 feet (2,000 meters)\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch3\u003eSystem Flexibility\u003c\/h3\u003e\n\u003cp\u003eWith support for up to \u003cstrong\u003e16 units in parallel\u003c\/strong\u003e, the FlexBOSS21 can be scaled for larger energy requirements. Its high-frequency, transformerless design, combined with flexible solar, battery, grid, and generator integration, makes it suitable for a wide range of modern energy systems.\u003c\/p\u003e\n\u003ch3\u003eKey Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e21,000W maximum utilized PV array power\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e25,000W maximum recommended PV input\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e16,000W output with PV at 240V\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e12,000W nominal output without PV\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e3 MPPTs supporting up to 5 strings\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e48V battery system\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e12,000W maximum battery charge\/discharge power\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e90A maximum AC bypass\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e120\/240V AC split-phase output\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e97% maximum PV-to-grid efficiency\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eUp to 16 units in parallel\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eIP65 \/ NEMA 4X protection\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eRS485 \/ CANBus \/ Wi-Fi communications\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e88 lbs (40 kg)\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e22.3\" W × 30.5\" H × 11.3\" D\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e10-Year EG4 Manufacturer Warranty\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eEG4 FlexBOSS21 Hybrid Inverter\u003c\/strong\u003e is backed by a \u003cstrong\u003e10-year EG4 manufacturer warranty\u003c\/strong\u003e, providing long-term coverage and added confidence in the inverter's reliability and performance.\u003c\/p\u003e","brand":"EG4","offers":[{"title":"Default Title","offer_id":52907819041055,"sku":"INV027","price":3599.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0887\/1965\/5199\/files\/EG4_FlexBOSS_21_Front-441x276.webp?v=1790019474","url":"https:\/\/offgridselection.com\/products\/eg4-flexboss21-hybrid-solar-inverter-21kw-pv-16kw-ac-split-phase-4-mppt-scalable-remote-wi-fi-monitoring-inv027","provider":"Off Grid Selection","version":"1.0","type":"link"}