{"product_id":"eg4-flexboss21-all-in-one-hybrid-inverter","title":"EG4 FlexBOSS21 All-In-One Hybrid Inverter","description":"\u003cdiv id=\"HEADING_PARA-zQvIHEWR4s\"\u003e\n\u003cdiv class=\"page_crafter_heading_para_container-zQvIHEWR4s   page-crafter-div-container\"\u003e\n\u003ch2\u003eThe EG4 FlexBOSS21 hands you full control of your power, whether you're tied to the grid, backing it up, or living completely off it.\u003c\/h2\u003e\n\u003ch3\u003eWhy You'll Love The EG4 FlexBOSS21\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eRuns your whole home, even the big loads.\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eWith 16kW of continuous output and enough muscle to start a 5-ton air conditioner, you're never stuck choosing between the fridge and the AC when the power drops. Everyone stays comfortable, no compromises.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThree ways to power your life.\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eRun fully off-grid, stay grid-tied with backup, or sell your extra solar back to the utility. You stop renting your power and start owning it.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIt grows as you do.\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ePair up to 16 units for a massive 256kW and pull from three independent MPPTs feeding 21kW of solar. Buy what you need today and expand whenever you're ready.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePeace of mind, built in.\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eMonitor and adjust everything from your phone over Wi-Fi, all housed in a weatherproof NEMA 4X enclosure and backed by a 10-year warranty. You're always in the loop, and always covered.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch3\u003eYour life, with the EG4 FlexBOSS21\u003c\/h3\u003e\n\u003cp\u003eThink back to the last time the power went out. The scramble for flashlights. The food slowly warming in the fridge. That nagging worry about how long it'll last.\u003c\/p\u003e\n\u003cp\u003eNow picture the opposite. The grid drops, and inside your home nothing changes. The switchover happens in about 20 milliseconds — faster than you can blink — so the TV keeps playing and the AC keeps humming. You barely notice.\u003c\/p\u003e\n\u003cp\u003eThat's daily life with the EG4 FlexBOSS21. On sunny days it turns your roof into a power plant, topping up your batteries and trimming your bill. When utility rates climb, it can sell your surplus back to the grid. When a storm rolls through, it quietly keeps your family safe and comfortable.\u003c\/p\u003e\n\u003cp\u003eBehind that simple experience sits a lot of smart engineering. It talks directly to your batteries through closed-loop communication, so charging stays safe and efficient. It accepts up to 600V of PV input, which means smaller cabling and often no combiner box — a cleaner, simpler install. And it pairs with the EG4 GridBOSS, so you manage your entire energy storage system from one place.\u003c\/p\u003e\n\u003cp\u003eAll of this runs at 97% efficiency and under 50dB of fan noise. It makes the most of the power you worked to generate, without the racket. That's what taking control of your energy actually feels like.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv id=\"TWO_COLUMN_GRID-rA9gz8g1SC\"\u003e\n\u003cdiv class=\"page-crafter-two-column-grid page_crafter_two_column_grid-rA9gz8g1SC\"\u003e\n\u003cdiv class=\"page_crafter_grid_media_container-rA9gz8g1SC  page-crafter-div-container\"\u003e\u003cimg class=\"page-crafter-image-base-class page_crafter_grid_media-rA9gz8g1SC\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0822\/6707\/8952\/files\/1_enhanced_bec1c735-21b2-470b-950b-16c549eca546.png?v=1742310829\" alt=\"Placeholder Image\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv id=\"TWO_COLUMN_GRID-rMa8YNcCKO\"\u003e\n\u003cdiv class=\"page-crafter-two-column-grid page_crafter_two_column_grid-rMa8YNcCKO\"\u003e\n\u003cdiv class=\"page-crafter-div-container\"\u003e\n\u003ch3\u003eThe EG4 FlexBOSS21 in a nutshell:\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003e21kW PV input across three MPPTs\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— capture more of your sunshine, with the freedom to run panels on different roof faces and angles.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNear-instant backup switching (about 20ms)\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— outages come and go without your appliances ever skipping a beat.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGridBOSS-ready with closed-loop battery comms\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— run your whole energy storage system as one smart, coordinated setup.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRapid shutdown, arc-fault and ground-fault protection\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e— NEC 2020-ready safety that looks after your home and everyone in it.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"page_crafter_grid_media_container-rMa8YNcCKO  page-crafter-div-container\"\u003e\u003cimg class=\"page-crafter-image-base-class page_crafter_grid_media-rMa8YNcCKO\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0822\/6707\/8952\/files\/2_enhanced_4d16c302-c6b5-4db1-92ca-f92bdd049ebb.png?v=1742310709\" alt=\"Placeholder Image\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv id=\"WHATS_INCLUDED-l0p4L3VjZq\"\u003e\n\u003cdiv class=\"page-crafter-whats-included-block page-crafter-inner-padding page-crafter-border-radius page_crafter_whats_included_container-l0p4L3VjZq\"\u003e\n\u003ch3 class=\"page-crafter-h3 page_crafter_whats_included_heading-l0p4L3VjZq page-crafter-bottom-spacing-small\"\u003eWhat's Included\u003c\/h3\u003e\n\u003cdiv class=\"page_crafter_whats_included_text-l0p4L3VjZq     page-crafter-div-container\"\u003e\n\u003cp\u003eEverything you need is included with your product.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"page-crafter-whats-included-container\"\u003e\n\u003cdiv class=\"page-crafter-div-container\"\u003e\n\u003cdiv class=\"page_crafter_whats_included_column_1_text-l0p4L3VjZq   page-crafter-ul-list-with-checkmark  page-crafter-div-container\"\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eEG4 FlexBOSS21 All-in-One Hybrid Solar Inverter\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e90A Breaker: Compatible only with the EG4 FlexBOSS21\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"page-crafter-div-container\"\u003e\n\u003cdiv class=\"page_crafter_whats_included_column_2_text-l0p4L3VjZq   page-crafter-ul-list-with-checkmark  page-crafter-div-container\"\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eSmart Port Breakers: Rated at 30A, 40A, 60A, and 80A.\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003eUser Manual\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv id=\"HEADING-5BPxjQocRR\"\u003e\n\u003ch2 class=\"page-crafter-h2 page_crafter_heading-5BPxjQocRR\"\u003ePlease Note:\u003c\/h2\u003e\n\u003c\/div\u003e\n\u003cdiv id=\"TEXT-KMVRbDO1Gq\"\u003e\n\u003cdiv class=\"page_crafter_plain_text-KMVRbDO1Gq     page-crafter-div-container\"\u003e\n\u003cul\u003e\n\u003cli\u003eYou must purchase a 70A Breaker separately for use with the EG4 18kPV Hybrid Inverter.\u003c\/li\u003e\n\u003cli\u003eYou must purchase a 50A Breaker separately for use with the EG4 12kPV Hybrid Inverter.\u003c\/li\u003e\n\u003cli\u003eA 125A Breaker (sold separately) can be used with either the Smart Port or Gen Port.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv id=\"HEADING-CI3mDJR2qt\"\u003e\n\u003ch2 class=\"page-crafter-h2 page_crafter_heading-CI3mDJR2qt\"\u003eEG4 FlexBOSS21 All-in-One Hybrid Inverter Specifications\u003c\/h2\u003e\n\u003c\/div\u003e\n\u003cdiv id=\"TABLE-FViDDxVgLf\"\u003e\n\u003cdiv class=\"page-crafter-simple-table-container page-crafter-div-container\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSpecification \u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDetails\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInput Voltage Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e120\/240VAC; 120\/208VAC (Split-phase)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOutput Power\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e16kW continuous when using pv input, with a peak surge capacity of 24kW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e29.5 x 20.5 x 11.2 inches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e88 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e10-year standard warranty, covering all major components\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv id=\"HEADING_PARA-H6yqLbEiir\"\u003e\n\u003cdiv class=\"page_crafter_heading_para_container-H6yqLbEiir   page-crafter-div-container\"\u003e\n\u003ch3 class=\"page-crafter-h2 page_crafter_heading-H6yqLbEiir page-crafter-element-bottom-spacing\"\u003eFrequently-Asked Questions\u003c\/h3\u003e\n\u003cdiv class=\"page_crafter_para-H6yqLbEiir     page-crafter-div-container\"\u003e\n\u003ch4\u003e\u003cstrong\u003eCan the EG4 FlexBOSS21 operate both off-grid and grid-tied?\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp\u003eYes! The FlexBOSS21 is designed for off-grid energy independence, grid-tied integration, and hybrid operation with battery backup.\u003c\/p\u003e\n\u003ch4\u003e\u003cstrong\u003eWhat battery types are compatible with this inverter?\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp\u003eThis inverter is optimized for 48V LiFePO4 battery banks, ensuring efficient and long-lasting performance.\u003c\/p\u003e\n\u003ch4\u003e\u003cstrong\u003eCan I expand my system with additional inverters?\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp\u003eYes, the FlexBOSS21 supports parallel operation, allowing multiple units to be stacked for increased energy output.\u003c\/p\u003e\n\u003ch4\u003e\u003cstrong\u003eDoes it support remote monitoring?\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp\u003eYes! The Wi-Fi and RS485 connectivity allow real-time system monitoring and control via the EG4 app.\u003c\/p\u003e\n\u003ch3\u003eLet the experts help you find your perfect EG4 FlexBOSS21 setup\u003c\/h3\u003e\n\u003cp\u003eNot sure how the EG4 FlexBOSS21 fits your loads, your panels, or your batteries? That's exactly what we're here for. Our team works with systems like this every day, and we'll help you size it right the first time — no guesswork.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eChat via email\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e—\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"mailto:support@kratopower.com\"\u003esupport@kratopower.com\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eChat on the phone\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e—\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"tel:+18888557286\"\u003e+1 888-855-7286\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eEG4 FlexBOSS21 documents and materials\u003c\/h3\u003e\n\u003cp\u003eEverything you need to spec, install, and register your EG4 FlexBOSS21:\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv id=\"HEADING_PARA-peyIO17jdN\"\u003e\n\u003cdiv class=\"page_crafter_heading_para_container-peyIO17jdN   page-crafter-div-container\"\u003e\n\u003ch3 class=\"page-crafter-h2 page_crafter_heading-peyIO17jdN page-crafter-element-bottom-spacing\"\u003eManual and Specifications\u003c\/h3\u003e\n\u003cdiv class=\"page_crafter_para-peyIO17jdN     page-crafter-div-container\"\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/eg4electronics.com\/wp-content\/uploads\/2024\/08\/FlexBOSS-21-Manual.pdf\" rel=\"noopener noreferrer\" target=\"_blank\"\u003eEG4 FlexBOSS21 16kw AC Hybrid Inverter | 48V Split Phase | 21kW PV Input | V1.1 Manual\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/eg4electronics.com\/wp-content\/uploads\/2024\/10\/EG4-FlexBoss21-Spec-Sheet.pdf\" rel=\"noopener noreferrer\" target=\"_blank\"\u003eEG4 FlexBOSS21 16kw AC Hybrid Inverter | 48V Split Phase | 21kW PV Input | V1.1 Specifications\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"#\"\u003eWiring Diagrams\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"#\"\u003eWarranty (10-Year)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"#\"\u003eUL 1741 Certificate of Compliance\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/eg4electronics.com\/wp-content\/uploads\/2024\/08\/CA-Prop-65-White-Paper.pdf\"\u003eCalifornia Proposition 65 Warning\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cstyle\u003e.page_crafter_heading_para_container-zQvIHEWR4s  { text-align: null; 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