{"product_id":"fortress-whole-home-solar-hybrid-inverter-max-16kw-ongrid-and-12kw-off-grid-continous-output-max-21kw-pv-array-200a-transfer-switc","title":"Fortress Whole Home Solar hybrid inverter; Max 16KW ongrid and 12KW off-grid continous output;Max 21KW PV array; 200A transfer switc","description":"\u003cp\u003e\u003cimg alt=\"Fortress\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0612\/1924\/2053\/files\/Fortress_Logo.png?v=1789079733\"\u003e\u003c\/p\u003e\n\u003cul class=\"accordion\"\u003e\n\u003cli class=\"accordion-item is-active\"\u003e\n\u003ch3 class=\"accordion-thumb\"\u003eDescription\u003c\/h3\u003e\n\u003cdiv class=\"accordion-panel\"\u003e\n\u003ch2\u003eFortress Whole Home Solar hybrid inverter; Max 16KW ongrid and 12KW off-grid continous output;Max 21KW PV array; 200A transfer switch:   IP 65 outdoor rated; pre-built AC \u0026amp;DC breakers; Built-in Apsmart RSD transmitter; 120\/240V Single and split phase, 120\/208V three phase, 127\/220V single \u0026amp; split phase; 50\/60HZ; breakers included\u003c\/h2\u003e\n\u003cp\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 output power across both confi gurations, with peak outputs of 16kW (240V) and 13.8kW (208V). Perfectly 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 and Specifications of the DuraRack Max\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eNumber of MPPT: 3\u003c\/li\u003e\n\u003cli\u003eInputs per MPPT: 2:2:1\u003c\/li\u003e\n\u003cli\u003eMax. usable input current (A): 26\/26\/15\u003c\/li\u003e\n\u003cli\u003eMax. short circuit input current (A): 31\/31\/19\u003c\/li\u003e\n\u003cli\u003eStart input voltage (V): 100\u003c\/li\u003e\n\u003cli\u003eMPPT DC nominal voltage (V): 360\u003c\/li\u003e\n\u003cli\u003eDC voltage range (V): 100-550\u003c\/li\u003e\n\u003cli\u003eMPPt operating voltage range (V): 120-440\u003c\/li\u003e\n\u003cli\u003eMax. Power (W): 21,000\u003c\/li\u003e\n\u003cli\u003eMax. PV ARRAY POWER (W): 25,000\u003c\/li\u003e\n\u003cli\u003eParalleling Capability: Up to 10 units (120kW)\u003c\/li\u003e\n\u003cli\u003eDimensions (W x H x D): 2.3 x 35.2 x 11.2 in (566 x 893 x 285 mm)\u003c\/li\u003e\n\u003cli\u003eWeight: 125.71 lbs (57 kg)\u003c\/li\u003e\n\u003cli\u003eDegree of protection: NEMA4X \/ IP66\u003c\/li\u003e\n\u003cli\u003eCooling concept: Smart Cooling Fans\u003c\/li\u003e\n\u003cli\u003eTopology: High Frequency Transformer-less\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eBackup Output Data\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eNominal output current (A): 50 @ 240V, 57.7 @ 208V\u003c\/li\u003e\n\u003cli\u003eNominal output voltage (V): (120\/240), (120\/208)\u003c\/li\u003e\n\u003cli\u003eContinuous output power (VA): 12000 @ 240V, 12000 @ 208V\u003c\/li\u003e\n\u003cli\u003eOperating frequency (Hz): 60\u003c\/li\u003e\n\u003cli\u003eTHDV: \u0026lt;3%\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"accordion-item\"\u003e\n\u003ch3 class=\"accordion-thumb\"\u003eResources\u003c\/h3\u003e\n\u003cdiv class=\"accordion-panel\"\u003e\n\u003cp style=\"font-size: 0.8em;\"\u003eDatasheet\u003c\/p\u003e\n\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0612\/1924\/2053\/files\/Fortress-Power-EnvyDuo21-0625-datasheet.pdf?v=1789972819\" target=\"_blank\"\u003e✔️ Download Datasheet\u003c\/a\u003e\u003chr\u003e\n\u003cp style=\"font-size: 0.8em;\"\u003eQuick Installation Guide\u003c\/p\u003e\n\u003cp\u003eNo quick installation guide file resource available. \u003ca href=\"https:\/\/solux.energy\/pages\/contact\" title=\"Contact Us\"\u003eEmail support@solux.energy\u003c\/a\u003e for file request.\u003c\/p\u003e\n\u003chr\u003e\n\u003cp style=\"font-size: 0.8em;\"\u003eWarranty\u003c\/p\u003e\n\u003cp\u003eNo warranty file resource available. \u003ca href=\"https:\/\/solux.energy\/pages\/contact\" title=\"Contact Us\"\u003eEmail support@solux.energy\u003c\/a\u003e for file request.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv style=\"clear: both;\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv class=\"cta-pdf\"\u003e\n\u003cdiv class=\"one-half-col-left\"\u003e\n\u003ch3\u003eDownload Spec Sheet of Fortress Envy Duo 21-US\u003cbr\u003e\n\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"one-half-col-right\"\u003e\n\u003cdiv class=\"pdf-sec-col\"\u003e\u003ca class=\"btn-download\" download=\"\" href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0612\/1924\/2053\/files\/Fortress-Power-EnvyDuo21-0625-datasheet.pdf?v=1789972819\" rel=\"noopener\" target=\"_blank\"\u003eYes, please\u003c\/a\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Solux, LLC","offers":[{"title":"Default Title","offer_id":45814519005253,"sku":"Envy Duo 21-US (16 kWh)","price":6114.65,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/1924\/2053\/files\/Fortress-Envy-Duo-21-US-16KW-2T.jpg?v=1789973706","url":"https:\/\/solux.energy\/products\/fortress-whole-home-solar-hybrid-inverter-max-16kw-ongrid-and-12kw-off-grid-continous-output-max-21kw-pv-array-200a-transfer-switc","provider":"Solux, LLC","version":"1.0","type":"link"}