{"product_id":"fortress-power-envy-duo-21-inverter","title":"Fortress Power Envy Duo 21 Inverter","description":"\u003cp\u003eMaximum Power. Dual-Purpose Design.\u003cbr\u003eThe Fortress Power Envy Duo 21 is a powerful 48V hybrid inverter designed to handle demanding residential and light commercial energy needs. With a maximum PV input of 25kW and dual-phase compatibility (240V split-phase and 208V three-phase), it delivers 12kW of continuous backup output power across both configurations, with max export power of 16kW.\u003c\/p\u003e\n\u003cp\u003ePerfectly matched with Fortress Power’s 48V battery systems, the Envy Duo 21 supports multiple applications. Its integrated AC\/DC breakers, rapid shutdown transmitter, and parallel scalability up to 120kW make it a versatile, future-ready solution.\u003c\/p\u003e\n\u003ch3\u003eFeatures:\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eHigh PV Input Capacity - Accepts up to 25kW of PV input—ideal for large residential or light commercial solar arrays seeking maximum generation potential.\u003c\/li\u003e\n\u003cli\u003eDual Voltage Compatibility - Supports both 240V split-phase and 208V three-phase* applications, making it flexible for a wide range of grid configurations.\u003c\/li\u003e\n\u003cli\u003eSeamless Battery Integration - Pairs with Fortress Power 48V batteries to deliver 12kW of continuous power and up to 16kW peak, ensuring stable, whole-home\u003c\/li\u003e\n\u003cli\u003eScalable System Design - Parallel up to 10 units for a total output of 120kW, expanding as energy demands grow without the need for complete system redesign.\u003c\/li\u003e\n\u003cli\u003eIntegrated Install-Friendly Hardware - Includes built-in AC\/DC breakers and an integrated rapid shutdown transmitter for faster, code-compliant installations.\u003c\/li\u003e\n\u003cli\u003eRemote Monitoring and Firmware Updates - Monitor your solar production, battery performance, and grid consumption anytime via the Fortress Power mobile app. The Envy also supports remote firmware updates, ensuring your system stays up to date without the need for onsite visits.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSpecifications:\u003c\/h3\u003e\n\u003ctable id=\"tablepress-12\" class=\"tablepress tablepress-id-12 tbody-has-connected-cells\"\u003e\n\u003ctbody class=\"row-striping row-hover\"\u003e\n\u003ctr class=\"row-1\"\u003e\n\u003ctd colspan=\"2\" class=\"column-1\"\u003e\u003cstrong\u003ePV Output Data\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"row-2\"\u003e\n\u003ctd class=\"column-1\"\u003eNumber of MPPT\u003c\/td\u003e\n\u003ctd class=\"column-2\"\u003e3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"row-3\"\u003e\n\u003ctd class=\"column-1\"\u003eInputs per MPPT\u003c\/td\u003e\n\u003ctd class=\"column-2\"\u003e2:2:1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"row-4\"\u003e\n\u003ctd class=\"column-1\"\u003eMax. usable input current (A)\u003c\/td\u003e\n\u003ctd class=\"column-2\"\u003e26\/26\/15\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"row-5\"\u003e\n\u003ctd class=\"column-1\"\u003eMax. short circuit input current (A)\u003c\/td\u003e\n\u003ctd class=\"column-2\"\u003e31\/31\/19\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"row-6\"\u003e\n\u003ctd class=\"column-1\"\u003eStart input voltage (V)\u003c\/td\u003e\n\u003ctd class=\"column-2\"\u003e100\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"row-7\"\u003e\n\u003ctd class=\"column-1\"\u003eMPPT DC nominal voltage (V)\u003c\/td\u003e\n\u003ctd class=\"column-2\"\u003e360\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"row-8\"\u003e\n\u003ctd class=\"column-1\"\u003eDC voltage range (V)\u003c\/td\u003e\n\u003ctd class=\"column-2\"\u003e100-550\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"row-9\"\u003e\n\u003ctd class=\"column-1\"\u003eMPPt operating voltage range (V)\u003c\/td\u003e\n\u003ctd class=\"column-2\"\u003e120-440\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"row-10\"\u003e\n\u003ctd class=\"column-1\"\u003eMax. Power (W)\u003c\/td\u003e\n\u003ctd class=\"column-2\"\u003e21000\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"row-11\"\u003e\n\u003ctd class=\"column-1\"\u003eMax. PV ARRAY POWER (W)\u003c\/td\u003e\n\u003ctd class=\"column-2\"\u003e25000\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"row-12\"\u003e\n\u003ctd colspan=\"2\" class=\"column-1\"\u003e\u003cstrong\u003eBackup Output Data\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"row-13\"\u003e\n\u003ctd class=\"column-1\"\u003eNominal output current (A)\u003c\/td\u003e\n\u003ctd class=\"column-2\"\u003e50@240V, 57.7@208V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"row-14\"\u003e\n\u003ctd class=\"column-1\"\u003eNominal output voltage (V)\u003c\/td\u003e\n\u003ctd class=\"column-2\"\u003e(120\/240), (120\/208)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"row-15\"\u003e\n\u003ctd class=\"column-1\"\u003eContinuous output power (VA)\u003c\/td\u003e\n\u003ctd class=\"column-2\"\u003e12000@240V, 12000@208V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"row-16\"\u003e\n\u003ctd class=\"column-1\"\u003eOperating frequency (Hz)\u003c\/td\u003e\n\u003ctd class=\"column-2\"\u003e60 \u0026amp; 50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"row-17\"\u003e\n\u003ctd class=\"column-1\"\u003ePeak power (VA)\u003c\/td\u003e\n\u003ctd class=\"column-2\"\u003e2xPn, 0.5s\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"row-18\"\u003e\n\u003ctd class=\"column-1\"\u003eTHDV\u003c\/td\u003e\n\u003ctd class=\"column-2\"\u003e\u0026lt;3%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"row-19\"\u003e\n\u003ctd class=\"column-1\"\u003eSwitching Time (ms)\u003c\/td\u003e\n\u003ctd class=\"column-2\"\u003e\u0026lt;20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"row-20\"\u003e\n\u003ctd colspan=\"2\" class=\"column-1\"\u003e\u003cstrong\u003eGeneral Data\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"row-21\"\u003e\n\u003ctd class=\"column-1\"\u003eParalleling Capabiliy\u003c\/td\u003e\n\u003ctd class=\"column-2\"\u003eUp to 10 units (120kW)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"row-22\"\u003e\n\u003ctd class=\"column-1\"\u003eDimensions\u003c\/td\u003e\n\u003ctd class=\"column-2\"\u003e22.3 x 35.2 x 11.2 in (566 x 893 x 285 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"row-23\"\u003e\n\u003ctd class=\"column-1\"\u003eWeight\u003c\/td\u003e\n\u003ctd class=\"column-2\"\u003e125.71 lbs (57 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"row-24\"\u003e\n\u003ctd class=\"column-1\"\u003eDegree of protection\u003c\/td\u003e\n\u003ctd class=\"column-2\"\u003eNEMA4X \/ IP66\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"row-25\"\u003e\n\u003ctd class=\"column-1\"\u003eCooling concept\u003c\/td\u003e\n\u003ctd class=\"column-2\"\u003eSmart Cooling Fans\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"row-26\"\u003e\n\u003ctd class=\"column-1\"\u003eTopology\u003c\/td\u003e\n\u003ctd class=\"column-2\"\u003eHigh Frequency Transformer-less\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"row-27\"\u003e\n\u003ctd class=\"column-1\"\u003eRelative humidity\u003c\/td\u003e\n\u003ctd class=\"column-2\"\u003e0-100%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"row-28\"\u003e\n\u003ctd class=\"column-1\"\u003eAltitude (m)\u003c\/td\u003e\n\u003ctd class=\"column-2\"\u003e\u0026lt;6561ft. (\u0026lt;2000m)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"row-29\"\u003e\n\u003ctd class=\"column-1\"\u003eOperating Temperature Range (ºC)\u003c\/td\u003e\n\u003ctd class=\"column-2\"\u003e-25~60\u0026gt;40 Derating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"row-30\"\u003e\n\u003ctd class=\"column-1\"\u003eNoise emission (dB)\u003c\/td\u003e\n\u003ctd class=\"column-2\"\u003e\u0026lt;67\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"row-31\"\u003e\n\u003ctd class=\"column-1\"\u003eIdle Consumption AVG (W)\u003c\/td\u003e\n\u003ctd class=\"column-2\"\u003e60\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"row-32\"\u003e\n\u003ctd class=\"column-1\"\u003eDisplay\u003c\/td\u003e\n\u003ctd class=\"column-2\"\u003eTouch color screen\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"row-33\"\u003e\n\u003ctd class=\"column-1\"\u003eCommunication interface\u003c\/td\u003e\n\u003ctd class=\"column-2\"\u003eRs485\/ Wi-Fi\/ CAN\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"row-34\"\u003e\n\u003ctd colspan=\"2\" class=\"column-1\"\u003e\u003cstrong\u003eAC Grid Output Data\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"row-35\"\u003e\n\u003ctd class=\"column-1\"\u003eMax. Output Current with pv (A)\u003c\/td\u003e\n\u003ctd class=\"column-2\"\u003e66.7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"row-36\"\u003e\n\u003ctd class=\"column-1\"\u003eMax. Output Power with pv (W)\u003c\/td\u003e\n\u003ctd class=\"column-2\"\u003e16000@240V 13800@208V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"row-37\"\u003e\n\u003ctd class=\"column-1\"\u003eContinuous power output with battery only (W)\u003c\/td\u003e\n\u003ctd class=\"column-2\"\u003e12000@240V, 12000@208V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"row-38\"\u003e\n\u003ctd class=\"column-1\"\u003eRated voltage (V)\u003c\/td\u003e\n\u003ctd class=\"column-2\"\u003e120\/240, 120\/208\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"row-39\"\u003e\n\u003ctd class=\"column-1\"\u003eOperating voltage range (V)\u003c\/td\u003e\n\u003ctd class=\"column-2\"\u003e180-270\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"row-40\"\u003e\n\u003ctd class=\"column-1\"\u003eOperating frequency (Hz)\u003c\/td\u003e\n\u003ctd class=\"column-2\"\u003e50\/60\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"row-41\"\u003e\n\u003ctd class=\"column-1\"\u003eOperating frequency range (Hz)\u003c\/td\u003e\n\u003ctd class=\"column-2\"\u003e55-65\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"row-42\"\u003e\n\u003ctd class=\"column-1\"\u003ePower Factor\u003c\/td\u003e\n\u003ctd class=\"column-2\"\u003e0.99@full load\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"row-43\"\u003e\n\u003ctd class=\"column-1\"\u003eReactive power adjust range\u003c\/td\u003e\n\u003ctd class=\"column-2\"\u003e-0.8~+0.8 leadingAdjustable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"row-44\"\u003e\n\u003ctd class=\"column-1\"\u003eTHDI\u003c\/td\u003e\n\u003ctd class=\"column-2\"\u003e\u0026lt;3%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"row-45\"\u003e\n\u003ctd class=\"column-1\"\u003eSync inrush current (A)\u003c\/td\u003e\n\u003ctd class=\"column-2\"\u003e35\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"row-46\"\u003e\n\u003ctd colspan=\"2\" class=\"column-1\"\u003e\u003cstrong\u003eEfficiency\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"row-47\"\u003e\n\u003ctd class=\"column-1\"\u003eMax. EFFICIENCY PV to grid\u003c\/td\u003e\n\u003ctd class=\"column-2\"\u003e97.50%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"row-48\"\u003e\n\u003ctd class=\"column-1\"\u003eMax. EFFICIENCY battery to grid\u003c\/td\u003e\n\u003ctd class=\"column-2\"\u003e94%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"row-49\"\u003e\n\u003ctd class=\"column-1\"\u003eCEC Efficiency\u003c\/td\u003e\n\u003ctd class=\"column-2\"\u003e96.90%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"row-50\"\u003e\n\u003ctd colspan=\"2\" class=\"column-1\"\u003e\u003cstrong\u003eBattery Data\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"row-51\"\u003e\n\u003ctd class=\"column-1\"\u003eType\u003c\/td\u003e\n\u003ctd class=\"column-2\"\u003eLithium battery\/ No Battery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"row-52\"\u003e\n\u003ctd class=\"column-1\"\u003eMax. charge current (A)\u003c\/td\u003e\n\u003ctd class=\"column-2\"\u003e250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"row-53\"\u003e\n\u003ctd class=\"column-1\"\u003eMax. discharge current (A)\u003c\/td\u003e\n\u003ctd class=\"column-2\"\u003e250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"row-54\"\u003e\n\u003ctd class=\"column-1\"\u003eNominal voltage (V)\u003c\/td\u003e\n\u003ctd class=\"column-2\"\u003e48\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"row-55\"\u003e\n\u003ctd class=\"column-1\"\u003eVoltage range (V)\u003c\/td\u003e\n\u003ctd class=\"column-2\"\u003e40-60\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eDownloads:\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/2809\/4762\/files\/Fortress-Power-Envy-Duo-21-Data-Sheet-English.pdf?v=1789680760\" target=\"_blank\" rel=\"noopener\"\u003eData Sheet\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/2809\/4762\/files\/Fortress-Power-Envy-Duo-21-Installation-Manual-English.pdf?v=1789680764\" target=\"_blank\" rel=\"noopener\"\u003eInstallation Manual\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/2809\/4762\/files\/Fortress-Power-Envy-Duo-21-OGPE-Certification.pdf?v=1789680759\" target=\"_blank\" rel=\"noopener\"\u003eOGPE Certification\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/2809\/4762\/files\/Fortress-Power-Envy-Duo-21-UL1741-PCS-MM-ATM-Certification.pdf?v=1789680759\" target=\"_blank\" rel=\"noopener\"\u003eUL1741\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/2809\/4762\/files\/Fortress-Power-Envy-Duo-21-Warranty-English.pdf?v=1789680759\" target=\"_blank\" rel=\"noopener\"\u003eWarranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Fortress Power","offers":[{"title":"Default Title","offer_id":50517433155832,"sku":"Envy-Duo-21","price":4898.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2809\/4762\/files\/fortress-power-fortress-power-envy-duo-21-inverter-envy-duo-21-1258857076.jpg?v=1789506672","url":"https:\/\/bensdeals.com\/products\/fortress-power-envy-duo-21-inverter","provider":"Ben's Deals","version":"1.0","type":"link"}