{"id":30284,"date":"2026-06-21T22:25:22","date_gmt":"2026-06-21T20:25:22","guid":{"rendered":"https:\/\/deyenergie.com\/product\/sun-bk250-2-56kwh-all-in-one\/"},"modified":"2026-08-02T08:33:14","modified_gmt":"2026-08-02T06:33:14","slug":"sun-bk250-2-56kwh-all-in-one","status":"publish","type":"product","link":"https:\/\/deyenergie.com\/en\/product\/sun-bk250-2-56kwh-all-in-one\/","title":{"rendered":"SUN-BK250-2.56KWH All-in-one"},"content":{"rendered":"

Download datasheet (PDF)<\/a><\/p>\n

Deye SUN-BK250 2.56 kWh \u2013 all-in-one micro-hybrid energy storage system (balcony power plant with storage)<\/h2>\n

The Deye SUN-BK250<\/strong> is a “3-in-1” micro-hybrid energy storage system that combines a micro-inverter and a 2.56 kWh LFP battery in a single compact unit. The SUN-BK250<\/strong> flexibly switches between hybrid (grid-tied), off-grid, and AC-coupled modes, making it suitable for reducing energy costs, outdoor power supply, and upgrading an existing balcony solar system with smart storage. It features up to 2.5 kW AC output and 4 independent MPPT channels, and thanks to its IP65 rating, it can be installed outdoors. <\/p>\n

Why choose the Deye SUN-BK250 system?<\/h3>\n

The Deye SUN-BK250 energy storage<\/strong> is based on safe LiFePO4 (lithium iron phosphate) cell chemistry, with a lifespan of over 6000 cycles. The system operates with up to 96.5% DC-AC efficiency, provides UPS-level uninterruptible supply with \u22644 ms grid\/island switching, and thanks to its plug-and-play design, can be connected to any standard outlet. Through the Deye Cloud app, up to 6 programmable charge\/discharge periods can be set to avoid peak tariffs, while the Deye Copilot function automatically selects the most favorable times based on dynamic electricity prices. <\/p>\n

Key advantages of the Deye SUN-BK250<\/h3>\n
    \n
  • 3-in-1 flexibility<\/strong> \u2013 hybrid, off-grid, and AC-coupled modes in a single unit<\/li>\n
  • Strong performance<\/strong> \u2013 up to 2.5 kW rated AC power, peak power twice the rated (10 s)<\/li>\n
  • 4 independent MPPTs<\/strong> \u2013 flexible PV input, 18L version up to 4400 W, 32L version up to 5760 W PV power<\/li>\n
  • UPS-level backup<\/strong> \u2013 \u22644 ms grid\/island switching<\/li>\n
  • IP65 protection<\/strong> \u2013 dust and waterproof, for outdoor installation<\/li>\n
  • Smart energy management<\/strong> \u2013 6 programmable periods, intelligent load control, wireless zero-export, Deye Cloud App<\/li>\n
  • Expandable storage<\/strong> \u2013 with AE-F2.56 battery packs up to 5 modules vertically (12.8 kWh), total of 40 packs (102.4 kWh)<\/li>\n
  • Wide compatibility<\/strong> \u2013 for 80\u2013250 W micro-inverters, AC-coupled connection to most European balcony micro-inverters<\/li>\n
  • Long lifespan and solid backing<\/strong> \u2013 >6000 cycles and 10-year warranty<\/li>\n<\/ul>\n

    Applications<\/h3>\n

    The Deye SUN-BK250 micro-hybrid energy storage<\/strong> is ideal in three scenarios: as a compact balcony solar power plant to increase self-consumption and reduce bills, as a portable power source for camping and outdoor activities, and as a reliable home backup power source during outages. The 2.56 kWh storage is sufficient to cover evening consumption, run backup devices, and still have capacity left for the next morning. Compatible with devices \u22642500 W \u2013 such as smaller kitchen and household appliances, lighting, routers, and entertainment electronics. <\/p>\n

    Deye SUN-BK250-2.56KWH technical specifications<\/h3>\n
    \n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
    Parameter<\/th>\nValue<\/th>\n<\/tr>\n<\/thead>\n
    System type<\/td>\nmicro-hybrid energy storage (integrated micro-inverter + LFP battery)<\/td>\n<\/tr>\n
    Operating modes<\/td>\nhybrid (grid-tied), off-grid, AC-coupled<\/td>\n<\/tr>\n
    Rated AC input\/output power<\/td>\n2500 W<\/td>\n<\/tr>\n
    Max. AC input\/output power<\/td>\n2750 W<\/td>\n<\/tr>\n
    Max. off-grid power<\/td>\n2500 W<\/td>\n<\/tr>\n
    Peak power (off-grid, 10 s)<\/td>\n2\u00d7 rated<\/td>\n<\/tr>\n
    AC frequency \/ voltage<\/td>\n50 Hz (45\u201355) \/ 60 Hz (55\u201365), 220\/230 Vac, L+N+PE<\/td>\n<\/tr>\n
    Rated AC current<\/td>\n11.4 A \/ 10.9 A<\/td>\n<\/tr>\n
    Max. AC current<\/td>\n12.5 A \/ 12 A<\/td>\n<\/tr>\n
    Inverter parallelization<\/td>\nmax. 3 units (up to 7.5 kW)<\/td>\n<\/tr>\n
    Max. PV power<\/td>\n4400 W (18L) \/ 5760 W (32L)<\/td>\n<\/tr>\n
    MPPT \/ strings<\/td>\n4 independent MPPTs \/ 4 strings<\/td>\n<\/tr>\n
    Max. PV operating current<\/td>\n18+18+18+18 A (18L) \/ 32+32+32+32 A (32L)<\/td>\n<\/tr>\n
    Rated PV voltage<\/td>\n42.5 V<\/td>\n<\/tr>\n
    Start-up voltage<\/td>\n25 Vdc<\/td>\n<\/tr>\n
    MPPT voltage range<\/td>\n20\u201355 V<\/td>\n<\/tr>\n
    Battery type<\/td>\nLiFePO4<\/td>\n<\/tr>\n
    Battery rated energy capacity<\/td>\n2560 Wh (2.56 kWh)<\/td>\n<\/tr>\n
    Battery voltage range<\/td>\n44.8\u201357.6 V<\/td>\n<\/tr>\n
    Max. charge\/discharge current<\/td>\n50 A<\/td>\n<\/tr>\n
    Cycle life<\/td>\n\u22656000 (25\u00b12 \u00b0C, 70% EOL)<\/td>\n<\/tr>\n
    Expandability<\/td>\nAE-F2.56 packs, max. 5 stacks (12.8 kWh), max. 40 packs (102.4 kWh)<\/td>\n<\/tr>\n
    Max. efficiency<\/td>\n96.5%<\/td>\n<\/tr>\n
    MPPT efficiency<\/td>\n>99%<\/td>\n<\/tr>\n
    Communication<\/td>\nWi-Fi, Bluetooth, LoRa<\/td>\n<\/tr>\n
    Operating temperature<\/td>\n\u221210\u201355 \u00b0C (power derating above 45 \u00b0C; optional heating \u221220\u201355 \u00b0C)<\/td>\n<\/tr>\n
    Humidity<\/td>\n0\u201395% (non-condensing)<\/td>\n<\/tr>\n
    Altitude<\/td>\n2000 m<\/td>\n<\/tr>\n
    Protection rating<\/td>\nIP65<\/td>\n<\/tr>\n
    Surge protection<\/td>\nType II (DC), Type II (AC)<\/td>\n<\/tr>\n
    Dimensions (W \u00d7 H \u00d7 D)<\/td>\n560 \u00d7 330 \u00d7 210 mm<\/td>\n<\/tr>\n
    Weight<\/td>\n30 kg<\/td>\n<\/tr>\n
    Warranty<\/td>\n10 years<\/td>\n<\/tr>\n
    Certifications<\/td>\nIEC 62619 \/ UN38.3 \/ IEC-EN 62109-1\/-2 \/ IEC-EN 61000-6-1\/2\/3\/4<\/td>\n<\/tr>\n
    Grid standards<\/td>\nVDE 4105, IEC 61727\/62116, VDE 0126, AS 4777.2, CEI 0-21, EN 50549-1, G98, C10-11, UNE 217002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

    Frequently asked questions about the Deye SUN-BK250 system<\/h3>\n

    What does the SUN-BK250 designation and 18L\/32L mean?<\/strong>
    \nThe “250” refers to the maximum 2500 W AC power (the series consists of 80\/160\/200\/250 W models, i.e., 800\u20132500 W). The “18L” and “32L” indicate the PV input capacity: the 18L version accepts up to 4400 W, the 32L version up to 5760 W PV power \u2013 both with the same 2.56 kWh LFP storage and 4 MPPT channels.<\/p>\n

    Can the Deye SUN-BK250 storage capacity be expanded?<\/strong>
    \nYes. Compatible with AE-F2.56 battery packs: up to 5 modules (12.8 kWh) can be stacked vertically, and a total of up to 40 packs (102.4 kWh) can be connected, with the same control unit, app, and 10-year warranty. <\/p>\n

    Can the Deye SUN-BK250 be installed outdoors?<\/strong>
    \nYes, thanks to its IP65 rating it is dust and waterproof, so it can be used outdoors, on balconies; with optional heating it operates down to \u221220 \u00b0C.<\/p>\n

    Can it be used with an existing balcony solar system?<\/strong>
    \nYes. In AC-coupled mode it can be connected to most European balcony micro-inverters without rewiring \u2013 so an existing balcony power plant can be upgraded with smart storage. <\/p>\n","protected":false},"excerpt":{"rendered":"

    Deye SUN-BK250-2.56KWH-EU-AM4 \u2013 2.5kW All-in-One Micro Hybrid Energy Storage System<\/strong><\/p>\n

    The Deye SUN-BK250-2.56KWH-EU-AM4 is a compact all-in-one micro hybrid energy storage system that combines a 2.5kW hybrid inverter<\/strong>, 2.56kWh LiFePO\u2084 battery<\/strong>, and intelligent energy management into a single plug-and-play solution. Designed for balcony solar systems, apartments, homes, and small off-grid applications, it offers an easy way to increase solar self-consumption, reduce electricity costs, and provide reliable backup power.<\/p>\n

    Powered by a 2.56kWh lithium iron phosphate (LiFePO\u2084) battery<\/strong>, the system delivers exceptional safety, long cycle life, and reliable daily energy storage. The integrated Battery Management System (BMS) continuously monitors battery performance and automatically optimizes charging based on battery conditions, ensuring maximum efficiency and long-term reliability.<\/p>\n

    The SUN-BK250 features four independent MPPT trackers<\/strong>, allowing up to 5.76kW PV input<\/strong> and supporting multiple solar panel orientations for maximum energy harvest. With up to 2.5kW AC output<\/strong>, it is perfectly suited for powering everyday household appliances while seamlessly switching between grid, battery, and solar power.<\/p>\n

    Designed for maximum flexibility, the system supports grid-tied, off-grid, and AC-coupled operation<\/strong>, with an ultra-fast 4ms transfer time<\/strong> for uninterrupted backup power during grid failures. Multiple units can also be connected in parallel, allowing system expansion as energy demands grow.<\/p>\n

    Its compact IP65-rated enclosure<\/strong> enables both indoor and outdoor installation, while built-in Wi-Fi, Bluetooth, and LoRa communication<\/strong> provide real-time monitoring and remote system management through Deye’s smart energy platform.<\/p>\n

    Key Features:<\/strong><\/p>\n

      \n
    • All-in-one system with integrated 2.5kW hybrid inverter and 2.56kWh LiFePO\u2084 battery<\/li>\n
    • Plug-and-play installation for balcony PV and residential solar systems<\/li>\n
    • Four independent MPPT trackers<\/li>\n
    • Supports up to 5.76kW<\/strong> PV input<\/li>\n
    • Up to 2.5kW<\/strong> AC output power<\/li>\n
    • Grid-tied, off-grid, and AC-coupled operating modes<\/li>\n
    • Ultra-fast 4ms<\/strong> backup switching<\/li>\n
    • Intelligent BMS with adaptive lithium battery charging<\/li>\n
    • Expandable with parallel operation (up to 3 units)<\/li>\n
    • Built-in Wi-Fi, Bluetooth, and LoRa connectivity<\/li>\n
    • IP65-rated enclosure for indoor and outdoor installation<\/li>\n
    • 10-year manufacturer warranty<\/li>\n<\/ul>\n

      Choose the Deye SUN-BK250-2.56KWH-EU-AM4<\/strong> for a compact, intelligent, and future-ready energy storage solution that combines solar generation, battery storage, and backup power in one easy-to-install system, delivering greater energy independence and long-term savings.<\/p>\n","protected":false},"featured_media":30285,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[],"product_cat":[326],"product_tag":[],"class_list":["post-30284","product","type-product","status-publish","has-post-thumbnail","product_cat-all-in-one-solutions","first","onbackorder","shipping-taxable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/deyenergie.com\/en\/wp-json\/wp\/v2\/product\/30284","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/deyenergie.com\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/deyenergie.com\/en\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/deyenergie.com\/en\/wp-json\/wp\/v2\/comments?post=30284"}],"version-history":[{"count":4,"href":"https:\/\/deyenergie.com\/en\/wp-json\/wp\/v2\/product\/30284\/revisions"}],"predecessor-version":[{"id":30806,"href":"https:\/\/deyenergie.com\/en\/wp-json\/wp\/v2\/product\/30284\/revisions\/30806"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/deyenergie.com\/en\/wp-json\/wp\/v2\/media\/30285"}],"wp:attachment":[{"href":"https:\/\/deyenergie.com\/en\/wp-json\/wp\/v2\/media?parent=30284"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/deyenergie.com\/en\/wp-json\/wp\/v2\/product_brand?post=30284"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/deyenergie.com\/en\/wp-json\/wp\/v2\/product_cat?post=30284"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/deyenergie.com\/en\/wp-json\/wp\/v2\/product_tag?post=30284"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}