{"product_id":"fortress-power-envy-duo-21g-whole-home-solar-hybrid-inverter-envy-duo-21g","title":"Fortress Power Envy Duo 21G Whole Home Solar Hybrid Inverter Envy Duo 21G","description":"\u003ch2\u003e\u003cstrong\u003eFortress Power Envy Duo 21G Whole Home Solar Hybrid Inverter Envy Duo 21G\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe Fortress Power Envy Duo 21G is a powerful 48V hybrid inverter engineered for large residential and light commercial solar-plus-storage systems. Designed to support up to 25kW of PV input, the Envy Duo 21G delivers 12kW of continuous backup power with battery operation and up to 16kW maximum grid export power. Supporting both 120\/240V split-phase and 120\/208V three-phase installations, it offers exceptional flexibility for a wide range of applications. \u003c\/p\u003e\n\u003cp\u003eThe inverter features three independent MPPTs, integrated AC\/DC breakers, a built-in rapid shutdown transmitter, and native compatibility with Fortress Power 48V battery systems. Parallel capability for up to ten inverters allows installers to build systems delivering up to 120kW of total output, making the Envy Duo 21G an ideal solution for scalable energy storage installations. \u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eKey Technology\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e25kW PV Input Capacity\u003c\/strong\u003e\u003cbr\u003eSupports large residential and light commercial solar arrays with exceptional solar harvesting capability.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eThree Independent MPPTs\u003c\/strong\u003e\u003cbr\u003eThree MPPT trackers maximize production across multiple roof orientations and varying shading conditions.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eDual-Voltage Compatibility\u003c\/strong\u003e\u003cbr\u003eSupports both 120\/240V split-phase and 120\/208V three-phase electrical systems.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e12kW Continuous Backup Output\u003c\/strong\u003e\u003cbr\u003eProvides dependable backup power for whole-home and light commercial applications.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e16kW Maximum Grid Export\u003c\/strong\u003e\u003cbr\u003eHigh export capability maximizes solar production and grid interaction.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eParallel Expansion\u003c\/strong\u003e\u003cbr\u003eSupports up to ten inverters operating together for systems up to 120kW.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eIntegrated Protection\u003c\/strong\u003e\u003cbr\u003eIncludes built-in AC\/DC breakers, AFCI, surge protection, rapid shutdown transmitter, and comprehensive grid protection.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eSmart Monitoring\u003c\/strong\u003e\u003cbr\u003eIntegrated RS485, CAN, and Wi-Fi communications with a full-color touchscreen display simplify commissioning and monitoring.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eBest Uses\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhole-Home Backup Systems\u003c\/strong\u003e\u003cbr\u003eProvides dependable backup power during utility outages.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLarge Residential Solar + Storage\u003c\/strong\u003e\u003cbr\u003ePerfect for homes with high electrical demand and battery storage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLight Commercial Installations\u003c\/strong\u003e\u003cbr\u003eIdeal for offices, retail locations, and small commercial facilities.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMicrogrid Applications\u003c\/strong\u003e\u003cbr\u003eSupports off-grid, grid-interactive, and hybrid operating modes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eScalable Energy Storage Projects\u003c\/strong\u003e\u003cbr\u003eParallel capability allows future system expansion without replacing existing equipment.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard Warranty:\u003c\/strong\u003e 10 Years\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBattery Platform:\u003c\/strong\u003e 48V Lithium\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum PV Array:\u003c\/strong\u003e 25kW\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Parallel Systems:\u003c\/strong\u003e 10 Units (120kW)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eProduct Specifications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cdiv class=\"TyagGW_tableContainer\"\u003e\n\u003cdiv class=\"group TyagGW_tableWrapper flex w-fit flex-col-reverse\" tabindex=\"-1\"\u003e\n\u003ctable class=\"w-fit min-w-(--thread-content-width)\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eDetails\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer\u003c\/td\u003e\n\u003ctd\u003eFortress Power\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eEnvy Duo 21G\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003e48V Hybrid Solar Inverter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery Voltage\u003c\/td\u003e\n\u003ctd\u003e48V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery Voltage Range\u003c\/td\u003e\n\u003ctd\u003e40–60V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum PV Array Power\u003c\/td\u003e\n\u003ctd\u003e25,000W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum PV Input Power\u003c\/td\u003e\n\u003ctd\u003e21,000W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of MPPTs\u003c\/td\u003e\n\u003ctd\u003e3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMPPT Inputs\u003c\/td\u003e\n\u003ctd\u003e2 : 2 : 1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMPPT Voltage Range\u003c\/td\u003e\n\u003ctd\u003e120–440V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum DC Voltage\u003c\/td\u003e\n\u003ctd\u003e550V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eContinuous Battery Backup Output\u003c\/td\u003e\n\u003ctd\u003e12,000W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Grid Export Power\u003c\/td\u003e\n\u003ctd\u003e16,000W @ 240V \/ 13,800W @ 208V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum AC Output Current\u003c\/td\u003e\n\u003ctd\u003e66.7A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAC Output Voltage\u003c\/td\u003e\n\u003ctd\u003e120\/240V Split Phase, 120\/208V Three Phase\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Frequency\u003c\/td\u003e\n\u003ctd\u003e50\/60Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Charge Current\u003c\/td\u003e\n\u003ctd\u003e250A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Discharge Current\u003c\/td\u003e\n\u003ctd\u003e250A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak Backup Power\u003c\/td\u003e\n\u003ctd\u003e2× Rated Power (0.5 Seconds)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum PV-to-Grid Efficiency\u003c\/td\u003e\n\u003ctd\u003e97.5%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery-to-Grid Efficiency\u003c\/td\u003e\n\u003ctd\u003e94%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCEC Efficiency\u003c\/td\u003e\n\u003ctd\u003e96.9%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication\u003c\/td\u003e\n\u003ctd\u003eRS485, CAN, Wi-Fi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisplay\u003c\/td\u003e\n\u003ctd\u003eTouch Color Screen\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCooling\u003c\/td\u003e\n\u003ctd\u003eSmart Cooling Fans\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnclosure Rating\u003c\/td\u003e\n\u003ctd\u003eNEMA 4X \/ IP66\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e-25°C to 60°C (Power Derating Above 40°C)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Humidity\u003c\/td\u003e\n\u003ctd\u003e0–100%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Installation Altitude\u003c\/td\u003e\n\u003ctd\u003e6,561 ft (2,000 m)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e22.3 × 35.2 × 11.2 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e125.7 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParallel Capability\u003c\/td\u003e\n\u003ctd\u003eUp to 10 Units (120kW Total)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSafety Features\u003c\/td\u003e\n\u003ctd\u003eAFCI, Rapid Shutdown (RSD), DC Switch per MPPT, PV Ground Fault Monitoring, Type III DC SPD, Type II AC SPD\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCertifications\u003c\/td\u003e\n\u003ctd\u003eUL1741SA, UL1741SB, UL9540, IEEE 1547:2018, IEEE 2030.5, CSA C22.2, FCC Part 15 Class B, Rule 21, Hawaii Rule 14H\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eAbout Fortress Power:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eFortress Power develops advanced lithium battery storage systems, hybrid inverters, and intelligent energy management solutions for residential and commercial renewable energy applications. Its products are engineered to deliver reliable backup power, seamless solar integration, and scalable energy independence through innovative hardware and cloud-connected monitoring platforms.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eScalable Hybrid Power for Large Solar and Energy Storage Systems\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe Fortress Power Envy Duo 21G combines high PV input capacity, advanced hybrid inverter technology, integrated protection, and scalable parallel operation into a powerful energy management solution for today's demanding residential and light commercial solar installations. Whether operating in backup, self-consumption, off-grid, or grid-interactive applications, the Envy Duo 21G delivers exceptional performance and long-term reliability.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eWhy Buy From US Solar Supplier\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eUS Solar Supplier is an American-founded company based in Kentucky dedicated to offering top-quality solar components from trusted manufacturers. We provide competitive pricing, dependable inventory, and products backed by warranties you can trust.\u003c\/p\u003e\n\u003cp\u003eOur inventory is updated daily with the latest solar technologies, and our experienced team is ready to assist with product selection, system design, and installation guidance.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eNeed Assistance?\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eHave questions before you order? Call \u003cstrong\u003e1-800-230-7004\u003c\/strong\u003e to speak with our knowledgeable support team. We're here to help with product compatibility, battery sizing, system design, or purchasing support.\u003c\/p\u003e","brand":"Fortress Power","offers":[{"title":"Default Title","offer_id":52136244838698,"sku":"USSSP202-1124","price":4390.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0566\/3408\/1340\/files\/IMAGE_EnvyDuo21G_USSS.jpg?v=1785327315","url":"https:\/\/ussolarsupplier.com\/products\/fortress-power-envy-duo-21g-whole-home-solar-hybrid-inverter-envy-duo-21g","provider":"US Solar Supplier","version":"1.0","type":"link"}