{"product_id":"bigbattery-eg4-flexboss21-hybrid-inverter","title":"EG4 FlexBOSS21 Hybrid Inverter | 16kW 120\/240V All-In-One","description":"\u003cdiv class=\"product-title\"\u003e\n\u003ch3 class=\"product_title entry-title\"\u003eEG4 FlexBOSS21 Hybrid Solar Inverter | 21kW PV \/ 16kW AC | Split-Phase | 4-MPPT | Scalable | Remote Wi-Fi Monitoring\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"container\"\u003e\n\u003cdiv class=\"markdown markdown-main-panel enable-updated-hr-color\" id=\"model-response-message-contentr_453b3fdac3ce4c5f\" aria-live=\"polite\" aria-busy=\"false\" dir=\"ltr\"\u003e\n\u003cp data-path-to-node=\"7\"\u003eThe EG4 FlexBOSS21 Hybrid Solar Inverter is a high-capacity hybrid inverter designed for advanced residential and commercial energy systems. With up to 21,000W PV input and 16,000W split-phase 120\/240V output, it delivers powerful and flexible performance for both on-grid and off-grid applications. Built to manage solar, battery, grid, and generator power, it also supports remote monitoring, mobile alerts, and scalable system expansion for modern energy independence. For further technical details, refer to the file named \"EG4 and BigBattery Solar Energy Systems and Components_18\".\u003c\/p\u003e\n\u003cp data-path-to-node=\"8\"\u003e\u003cb data-path-to-node=\"8\" data-index-in-node=\"0\"\u003eProduct Highlights\u003c\/b\u003e\u003c\/p\u003e\n\u003cul data-path-to-node=\"9\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"9,0,0\"\u003e\u003cb data-path-to-node=\"9,0,0\" data-index-in-node=\"0\"\u003eHigh Solar Capacity:\u003c\/b\u003e 21,000W PV input capacity for large solar energy systems.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"9,1,0\"\u003e\u003cb data-path-to-node=\"9,1,0\" data-index-in-node=\"0\"\u003ePowerful Output:\u003c\/b\u003e 16,000W split-phase output for residential and commercial power applications.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"9,2,0\"\u003e\u003cb data-path-to-node=\"9,2,0\" data-index-in-node=\"0\"\u003eStandard Voltage:\u003c\/b\u003e 120\/240V split-phase output for standard and heavy-duty loads.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"9,3,0\"\u003e\u003cb data-path-to-node=\"9,3,0\" data-index-in-node=\"0\"\u003eAdvanced Optimization:\u003c\/b\u003e 3 MPPT inputs supporting up to 5 strings for optimized solar production.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"9,4,0\"\u003e\u003cb data-path-to-node=\"9,4,0\" data-index-in-node=\"0\"\u003eGrid Integration:\u003c\/b\u003e 90A grid feed-through for high-demand loads and smooth grid integration.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"9,5,0\"\u003e\u003cb data-path-to-node=\"9,5,0\" data-index-in-node=\"0\"\u003eBattery Versatility:\u003c\/b\u003e 48V battery system compatibility for grid-tied, hybrid, and off-grid installations.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"9,6,0\"\u003e\u003cb data-path-to-node=\"9,6,0\" data-index-in-node=\"0\"\u003eUpgrade Friendly:\u003c\/b\u003e AC coupling compatibility for system upgrades and retrofits.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"9,7,0\"\u003e\u003cb data-path-to-node=\"9,7,0\" data-index-in-node=\"0\"\u003eSystem Orchestration:\u003c\/b\u003e EG4 GridBOSS MID integration for advanced system control.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"9,8,0\"\u003e\u003cb data-path-to-node=\"9,8,0\" data-index-in-node=\"0\"\u003eDigital Control:\u003c\/b\u003e Remote Wi-Fi monitoring and mobile alerts for real-time system visibility.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"9,9,0\"\u003e\u003cb data-path-to-node=\"9,9,0\" data-index-in-node=\"0\"\u003eDurability:\u003c\/b\u003e IP65 \/ NEMA 4X protection rating for durable installation environments.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"9,10,0\"\u003e\u003cb data-path-to-node=\"9,10,0\" data-index-in-node=\"0\"\u003eLong-Term Reliability:\u003c\/b\u003e 10-year EG4 manufacturer warranty with lifetime USA-based tech support.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-path-to-node=\"10\"\u003e\u003cb data-path-to-node=\"10\" data-index-in-node=\"0\"\u003eKey Features\u003c\/b\u003e\u003c\/p\u003e\n\u003cul data-path-to-node=\"11\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"11,0,0\"\u003e\u003cb data-path-to-node=\"11,0,0\" data-index-in-node=\"0\"\u003eHigh-Capacity Hybrid Performance:\u003c\/b\u003e Supports up to 21,000W PV input and 16,000W split-phase output, serving as a powerful option for advanced systems.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"11,1,0\"\u003e\u003cb data-path-to-node=\"11,1,0\" data-index-in-node=\"0\"\u003eOn-Grid and Off-Grid Flexibility:\u003c\/b\u003e Designed for grid-tied, hybrid, and off-grid installations to support varied solar and backup setups.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"11,2,0\"\u003e\u003cb data-path-to-node=\"11,2,0\" data-index-in-node=\"0\"\u003eSplit-Phase Power Output:\u003c\/b\u003e Provides 120\/240V split-phase output to power standard household loads and heavier appliances.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"11,3,0\"\u003e\u003cb data-path-to-node=\"11,3,0\" data-index-in-node=\"0\"\u003eAdvanced Solar Optimization:\u003c\/b\u003e Utilizes 3 MPPT inputs supporting up to 5 strings to maximize production across multiple solar arrays.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"11,4,0\"\u003e\u003cb data-path-to-node=\"11,4,0\" data-index-in-node=\"0\"\u003eGridBOSS MID Integration:\u003c\/b\u003e Integrates with the EG4 GridBOSS MID gateway for smart load management, generator support, and simplified installation.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"11,5,0\"\u003e\u003cb data-path-to-node=\"11,5,0\" data-index-in-node=\"0\"\u003eSmart Energy Management:\u003c\/b\u003e Supports peak shaving and intelligent power distribution to help improve energy efficiency and system control.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"11,6,0\"\u003e\u003cb data-path-to-node=\"11,6,0\" data-index-in-node=\"0\"\u003eBuilt-In Safety Protections:\u003c\/b\u003e Includes rapid shutdown, ground fault protection, and arc fault protection for safer, code-compliant operation.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"11,7,0\"\u003e\u003cb data-path-to-node=\"11,7,0\" data-index-in-node=\"0\"\u003eRemote Monitoring \u0026amp; Alerts:\u003c\/b\u003e Features Wi-Fi connectivity and mobile alerts for real-time system tracking from any location.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"11,8,0\"\u003e\u003cb data-path-to-node=\"11,8,0\" data-index-in-node=\"0\"\u003eScalable System Design:\u003c\/b\u003e Supports up to 16 parallel connections, making it suitable for large-scale energy configurations.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"11,9,0\"\u003e\u003cb data-path-to-node=\"11,9,0\" data-index-in-node=\"0\"\u003eOutdoor-Ready Protection:\u003c\/b\u003e Features an IP65 \/ NEMA 4X protection rating to safeguard the unit in demanding installation environments.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"11,10,0\"\u003e\u003cb data-path-to-node=\"11,10,0\" data-index-in-node=\"0\"\u003eMaintenance-Free Operation:\u003c\/b\u003e Engineered for dependable performance with no routine servicing required.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!----\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cimg loading=\"lazy\" decoding=\"async\" width=\"2560\" height=\"1025\" src=\"https:\/\/bigbattery.com\/wp-content\/uploads\/2026\/04\/FlexBoss21-Simple-System-Expansion-Final-scaled-1.webp\" alt=\"EG4 FlexBoss21 Inverter - Simply scalable\" class=\"wp-image-212488\" srcset=\"https:\/\/bigbattery.com\/wp-content\/uploads\/2026\/04\/FlexBoss21-Simple-System-Expansion-Final-scaled-1.webp 2560w, https:\/\/bigbattery.com\/wp-content\/uploads\/2026\/04\/FlexBoss21-Simple-System-Expansion-Final-scaled-1-300x120.webp 300w, https:\/\/bigbattery.com\/wp-content\/uploads\/2026\/04\/FlexBoss21-Simple-System-Expansion-Final-scaled-1-1024x410.webp 1024w, https:\/\/bigbattery.com\/wp-content\/uploads\/2026\/04\/FlexBoss21-Simple-System-Expansion-Final-scaled-1-768x308.webp 768w, https:\/\/bigbattery.com\/wp-content\/uploads\/2026\/04\/FlexBoss21-Simple-System-Expansion-Final-scaled-1-1536x615.webp 1536w, https:\/\/bigbattery.com\/wp-content\/uploads\/2026\/04\/FlexBoss21-Simple-System-Expansion-Final-scaled-1-2048x820.webp 2048w, https:\/\/bigbattery.com\/wp-content\/uploads\/2026\/04\/FlexBoss21-Simple-System-Expansion-Final-scaled-1-990x396.webp 990w, https:\/\/bigbattery.com\/wp-content\/uploads\/2026\/04\/FlexBoss21-Simple-System-Expansion-Final-scaled-1-441x177.webp 441w, https:\/\/bigbattery.com\/wp-content\/uploads\/2026\/04\/FlexBoss21-Simple-System-Expansion-Final-scaled-1-813x326.webp 813w, https:\/\/bigbattery.com\/wp-content\/uploads\/2026\/04\/FlexBoss21-Simple-System-Expansion-Final-scaled-1-1300x521.webp 1300w, https:\/\/bigbattery.com\/wp-content\/uploads\/2026\/04\/FlexBoss21-Simple-System-Expansion-Final-scaled-1-150x60.webp 150w\" sizes=\"auto, (max-width: 2560px) 100vw, 2560px\"\u003e\u003cimg loading=\"lazy\" decoding=\"async\" width=\"2560\" height=\"1025\" src=\"https:\/\/bigbattery.com\/wp-content\/uploads\/2026\/04\/EG4-Inverter-Certification-scaled-2.webp\" alt=\"UL1741 Certified\" class=\"wp-image-212494\" srcset=\"https:\/\/bigbattery.com\/wp-content\/uploads\/2026\/04\/EG4-Inverter-Certification-scaled-2.webp 2560w, https:\/\/bigbattery.com\/wp-content\/uploads\/2026\/04\/EG4-Inverter-Certification-scaled-2-300x120.webp 300w, https:\/\/bigbattery.com\/wp-content\/uploads\/2026\/04\/EG4-Inverter-Certification-scaled-2-1024x410.webp 1024w, https:\/\/bigbattery.com\/wp-content\/uploads\/2026\/04\/EG4-Inverter-Certification-scaled-2-768x308.webp 768w, https:\/\/bigbattery.com\/wp-content\/uploads\/2026\/04\/EG4-Inverter-Certification-scaled-2-1536x615.webp 1536w, https:\/\/bigbattery.com\/wp-content\/uploads\/2026\/04\/EG4-Inverter-Certification-scaled-2-2048x820.webp 2048w, https:\/\/bigbattery.com\/wp-content\/uploads\/2026\/04\/EG4-Inverter-Certification-scaled-2-990x396.webp 990w, https:\/\/bigbattery.com\/wp-content\/uploads\/2026\/04\/EG4-Inverter-Certification-scaled-2-441x177.webp 441w, https:\/\/bigbattery.com\/wp-content\/uploads\/2026\/04\/EG4-Inverter-Certification-scaled-2-813x326.webp 813w, https:\/\/bigbattery.com\/wp-content\/uploads\/2026\/04\/EG4-Inverter-Certification-scaled-2-1300x521.webp 1300w, https:\/\/bigbattery.com\/wp-content\/uploads\/2026\/04\/EG4-Inverter-Certification-scaled-2-150x60.webp 150w\" sizes=\"auto, (max-width: 2560px) 100vw, 2560px\"\u003e\u003cimg loading=\"lazy\" decoding=\"async\" width=\"2097\" height=\"840\" src=\"https:\/\/i0.wp.com\/bigbattery.com\/wp-content\/uploads\/2025\/05\/Flexboss-All-weather-Rain.gif?fit=2097%2C840\u0026amp;ssl=1\" alt=\"Power stays on in storm and rain - EG4 FlexBoss21 Inverter\" class=\"wp-image-165107\"\u003e\u003cimg loading=\"lazy\" decoding=\"async\" width=\"2097\" height=\"840\" src=\"https:\/\/i0.wp.com\/bigbattery.com\/wp-content\/uploads\/2025\/05\/Flexboss21-All-Weather-Snow.gif?fit=2097%2C840\u0026amp;ssl=1\" alt=\"Power endures snow - EG4 FlexBoss21 Inverter\" class=\"wp-image-165112\"\u003e\u003c\/p\u003e\n\u003ch3 data-section-id=\"xsmcan\" data-start=\"3174\" data-end=\"3191\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong data-start=\"3178\" data-end=\"3191\"\u003eResources\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul data-start=\"3195\" data-end=\"3317\"\u003e\n\u003cli data-section-id=\"l8oz0i\" data-start=\"3195\" data-end=\"3211\"\u003e\u003ca href=\"https:\/\/bigbattery.com\/wp-content\/uploads\/2025\/01\/EG4-FlexBoss21-Spec-Sheet.pdf\"\u003e\u003cstrong data-start=\"3197\" data-end=\"3211\"\u003eSpec Sheet\u003c\/strong\u003e\u003c\/a\u003e\u003c\/li\u003e\n\u003cli data-section-id=\"smpu5f\" data-start=\"3214\" data-end=\"3231\"\u003e\u003ca href=\"https:\/\/bigbattery.com\/wp-contehttps:\/\/bigbattery.com\/wp-content\/uploads\/2025\/01\/FlexBOSS-21-Manual.pdfnt\/uploads\/2025\/01\/FlexBOSS-21-Manual.pdf\"\u003e\u003cstrong data-start=\"3216\" data-end=\"3231\"\u003eUser Manual\u003c\/strong\u003e\u003c\/a\u003e\u003c\/li\u003e\n\u003cli data-section-id=\"11u2ydj\" data-start=\"3234\" data-end=\"3258\"\u003e\u003ca href=\"https:\/\/bigbattery.com\/wp-content\/uploads\/2024\/11\/EG4-FlexBoss21-COC.pdf\"\u003e\u003cstrong data-start=\"3236\" data-end=\"3258\"\u003eUL1741 Certificate\u003c\/strong\u003e\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"EG4","offers":[{"title":"Default Title","offer_id":50711363977463,"sku":"INV027","price":3599.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0905\/1868\/3895\/files\/EG4_FlexBOSS_21_Front.webp?v=1777043994","url":"https:\/\/northgridsupply.com\/products\/bigbattery-eg4-flexboss21-hybrid-inverter","provider":"Northgrid Supply","version":"1.0","type":"link"}