{"product_id":"src-jk-2705-jkbms-b1a20s15p-7s-20s-active-balance-bms-balance-current-1a-continuous-current-150a-lifepo4-li-ion-lto-battery","title":"JKBMS B1A20S15P Active Balance Smart BMS 7S-20S 150A 1A Balancer Bluetooth RS485 for LiFePO4 Li-ion LTO","description":"\u003ch2\u003eOverview\u003c\/h2\u003e\u003cp\u003eThe \u003ca href=\"https:\/\/tsolar.top\/collections\/jkbms-jikong-bms\" title=\"JKBMS - JIKONG BMS\"\u003eJKBMS\u003c\/a\u003e B1A20S15P is an active balance \u003ca href=\"https:\/\/tsolar.top\/collections\/smart-bms\" title=\"Smart BMS\"\u003esmart BMS\u003c\/a\u003e (battery management system) for multi-series lithium battery packs, with built-in Bluetooth monitoring and RS485 communication. It supports Li-ion (7S–20S), LiFePO4 (8S–20S), and LTO (12S–20S), and provides 1A active balancing with 150A continuous charge\/discharge capability.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eActive balancing:\u003c\/strong\u003e Active Balance (Full State On), balance current 1000 mA (1A).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh current design:\u003c\/strong\u003e 150A continuous charge current and 150A continuous discharge current; maximum discharge current 300A (MAX 2 min).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBluetooth monitoring:\u003c\/strong\u003e Bluetooth built-in; supports Android \u0026amp; iOS phones. Use the specified Bluetooth app to activate the BMS, then search the relevant serial number to view data.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCommunications:\u003c\/strong\u003e RS485 (default). CANBUS\/HEAT listed as customized.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCell\/pack measurement:\u003c\/strong\u003e Single cell voltage range 1–5V (detection range 0–5V); total voltage detection range 0–100V.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProtection functions:\u003c\/strong\u003e Over charge protection, over discharge protection, over current protection, short circuit protection, over temperature protection, and “all-in protection” (cable drop\/poor contact).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating modes (as described):\u003c\/strong\u003e Storage mode (no battery pack current consumption), normal working mode (charging activates), standby mode (auto after set time; 1–30 days can be set), and shutdown (auto when a cell falls below shutdown voltage).\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eFor configuration and after-sales support, contact \u003ca href=\"mailto:service@tsolar.top\"\u003eservice@tsolar.top\u003c\/a\u003e.\u003c\/p\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eB1A20S15P\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupported battery strings (Li-ion)\u003c\/td\u003e\n\u003ctd\u003e7S–20S\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupported battery strings (LiFePO4)\u003c\/td\u003e\n\u003ctd\u003e8S–20S\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupported battery strings (LTO)\u003c\/td\u003e\n\u003ctd\u003e12S–20S\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBalance method\u003c\/td\u003e\n\u003ctd\u003eActive Balance (Full State On)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBalance current\u003c\/td\u003e\n\u003ctd\u003e1A (1000 mA)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower supply mode\u003c\/td\u003e\n\u003ctd\u003eThe battery pack is self-powered\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWiring \/ port\u003c\/td\u003e\n\u003ctd\u003eCommon Port (same port)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eContinuous charge current\u003c\/td\u003e\n\u003ctd\u003e150A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eContinuous discharge current\u003c\/td\u003e\n\u003ctd\u003e150A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum discharge current\u003c\/td\u003e\n\u003ctd\u003e300A (MAX 2 min)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOver charge protection current (adjustable)\u003c\/td\u003e\n\u003ctd\u003e10–150A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConductive resistance in main circuit\u003c\/td\u003e\n\u003ctd\u003e0.65 mΩ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSingle cell voltage detection range\u003c\/td\u003e\n\u003ctd\u003e0–5V; error \u0026lt;10 mV over full operating range; typical error \u0026lt;5 mV\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSingle cell voltage range (supported)\u003c\/td\u003e\n\u003ctd\u003e1–5V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage acquisition accuracy\u003c\/td\u003e\n\u003ctd\u003e±5 mV\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupport single cell voltage dropout detection\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal voltage detection range\u003c\/td\u003e\n\u003ctd\u003e0–100V; \u0026lt;0.5% FSR (FSR = full scale)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent sense shunt\u003c\/td\u003e\n\u003ctd\u003e-150A to 300A; error \u0026lt;0.5% FSR\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSoC estimation accuracy\u003c\/td\u003e\n\u003ctd\u003eError \u0026lt;8% (operating conditions)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery remaining capacity accuracy\u003c\/td\u003e\n\u003ctd\u003eError range is less than 8%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Cycle AH cumulative value\u003c\/td\u003e\n\u003ctd\u003eHalf of the charge\/discharge value\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOver charge protection voltage (adjustable)\u003c\/td\u003e\n\u003ctd\u003e1.2–4.35V Adjustable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOver charge release voltage (adjustable)\u003c\/td\u003e\n\u003ctd\u003e1.2–4.35V Adjustable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOver discharge protection voltage (adjustable)\u003c\/td\u003e\n\u003ctd\u003e1.2–4.35V Adjustable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOver discharge release voltage (adjustable)\u003c\/td\u003e\n\u003ctd\u003e1.2–4.35V Adjustable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOver current detect delay (adjustable)\u003c\/td\u003e\n\u003ctd\u003e2–120 s Adjustable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature detection range\u003c\/td\u003e\n\u003ctd\u003e-40 to 125°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQuantity of temperature detection\u003c\/td\u003e\n\u003ctd\u003e3 pcs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating temperature\u003c\/td\u003e\n\u003ctd\u003e-40 to 85°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStoring temperature\u003c\/td\u003e\n\u003ctd\u003e-40 to 95°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating power consumption\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;5 mA (without communication) \/ 15 mA (485\/CAN)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStandby power consumption\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;2 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShort circuit protection\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemp protection\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoulomb counter\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBluetooth function\u003c\/td\u003e\n\u003ctd\u003eSupport for Android \u0026amp; iOS phone\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOther interfaces (default)\u003c\/td\u003e\n\u003ctd\u003eRS485\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOther interfaces (customized)\u003c\/td\u003e\n\u003ctd\u003eCANBUS\/HEAT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize\u003c\/td\u003e\n\u003ctd\u003e162*102*20 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch2\u003eInterface Notes (as labeled)\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCANBUS (need customization):\u003c\/strong\u003e GND, CAN_H, CAN_L\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRS485 (by default):\u003c\/strong\u003e GND, RX, TX, VCC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLCD (by default):\u003c\/strong\u003e K-, K+, GND, B, A, VCC\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eHeat function (need customization)\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eApplications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eLiFePO4, Li-ion, and LTO battery packs requiring active balancing and smart monitoring\u003c\/li\u003e\n\u003cli\u003eEnergy storage battery packs and other multi-series lithium battery systems (within the supported string counts and voltage ranges)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eNotes on Model Labels Found in Provided Graphics\u003c\/h2\u003e\u003cul\u003e\u003cli\u003eSome documentation graphics include the following model texts: JK-BD6A17S6P (0.6A active balance current, 60A continuous discharge\/charge current; strings listed: 10S–17S LTO, 7S–17S Li-ion, 8S–17S LiFePO4; device label text also lists peak current 100A and battery strings 03–17S), and JK-B2A20S20P-H-C (2A active balance current, 200A continuous discharge\/charge current; strings listed: 10S–20S LTO, 7S–20S Li-ion, 8S–20S LiFePO4; text also mentions heating function and CANBUS chip).\u003c\/li\u003e\u003c\/ul\u003e\u003ch2 id=\"details\"\u003eDetails\u003c\/h2\u003e\u003cdiv class=\"details-gallery\"\u003e\n\u003cimg alt=\"JKBMS active balance smart BMS (JK-BD6A17S6P) with 0.6A balancing and 60A charge\/discharge rating\" loading=\"lazy\" src=\"https:\/\/tsolar.top\/cdn\/shop\/files\/JKBMS-B1A20S15P-7S-20S-Active-Balance-BMS-Balance-Current-1A.jpg?v=1780115918\"\u003e\u003cp\u003eSkip balancing losses and help keep multi‑series packs aligned with an active balancer design for Li‑ion, LiFePO4, or LTO systems.\u003c\/p\u003e\n\u003cimg alt=\"JKBMS smart BMS (JK-B2A20S20P-H-C) with balance current 2A and 200A continuous charge\/discharge, RS485\/CAN options noted\" loading=\"lazy\" src=\"https:\/\/tsolar.top\/cdn\/shop\/files\/JKBMS-B1A20S15P-7S-20S-Active-Balance-BMS-Balance-Current-1A_014367c2-d9d1-401c-af66-676762d38217.jpg?v=1780115926\"\u003e\u003cp\u003eBuilt‑in communications options like RS485 (default) support monitoring and integration for higher‑current battery builds.\u003c\/p\u003e\n\u003cimg alt=\"Exploded internal view of the JKBMS unit showing housing, main PCB, components, and connector layout\" loading=\"lazy\" src=\"https:\/\/tsolar.top\/cdn\/shop\/files\/JKBMS-B1A20S15P-7S-20S-Active-Balance-BMS-Balance-Current-1A.png?v=1780115933\"\u003e\u003cp\u003eLayered construction highlights the main control board and connection interfaces used for cell sensing and power handling.\u003c\/p\u003e\n\u003cimg alt=\"connector pinout close-up labeling CAN\/RS485, GPS, LCD, and heating function ports (customization noted)\" loading=\"lazy\" src=\"https:\/\/tsolar.top\/cdn\/shop\/files\/JKBMS-B1A20S15P-7S-20S-Active-Balance-BMS-Balance-Current-1A_0f176b35-3388-4823-b8e9-aef6d2f73540.jpg?v=1780115939\"\u003e\u003cp\u003eClear port labeling helps with wiring for RS485 by default, plus optional CANBUS, display (LCD), and heating connections.\u003c\/p\u003e\n\u003cimg alt=\"Bluetooth battery monitoring app screen displaying pack voltage, current, balance status, temperatures, and per-cell voltages\" loading=\"lazy\" src=\"https:\/\/tsolar.top\/cdn\/shop\/files\/JKBMS-B1A20S15P-7S-20S-Active-Balance-BMS-Balance-Current-1A_1df58bc2-d820-4eab-b66f-51a244cbc5f9.jpg?v=1780115947\"\u003e\u003cp\u003eBluetooth monitoring provides real‑time pack stats, cell voltages, and balance current from a phone app on iOS or Android.\u003c\/p\u003e\n\u003cimg alt=\"app screenshots showing device scan list, chemistry selection (Li-ion\/LiFePO4\/LTO), and live cell voltage dashboard\" loading=\"lazy\" src=\"https:\/\/tsolar.top\/cdn\/shop\/files\/JKBMS-B1A20S15P-7S-20S-Active-Balance-BMS-Balance-Current-1A_166597e7-1020-4e46-9287-bb1e75be4f04.jpg?v=1780115956\"\u003e\u003cp\u003eSwitch chemistry settings, scan for the BMS, and review individual cell readings and wiring resistance in the same app.\u003c\/p\u003e\n\u003cimg alt=\"Battery protection infographic listing overcharge, overdischarge, short circuit, overcurrent, all-in, and overtemperature protection\" loading=\"lazy\" src=\"https:\/\/tsolar.top\/cdn\/shop\/files\/JKBMS-B1A20S15P-7S-20S-Active-Balance-BMS-Balance-Current-1A_09ea5229-9ed8-4584-96de-f469cacb5435.jpg?v=1780115963\"\u003e\u003cp\u003eA full set of protections covers common fault conditions including over‑charge, over‑discharge, over‑current, short circuit, and over‑temperature.\u003c\/p\u003e\n\u003cimg alt=\"Smart energy working mode switching chart: storage mode, normal working mode, standby mode, and shutdown logic\" loading=\"lazy\" src=\"https:\/\/tsolar.top\/cdn\/shop\/files\/JKBMS-B1A20S15P-7S-20S-Active-Balance-BMS-Balance-Current-1A_13cb35bf-3f08-4184-8b01-ab5b97e5417e.jpg?v=1780115972\"\u003e\u003cp\u003eMultiple operating modes support storage, normal use, standby timing, and automatic shutdown based on low‑cell conditions.\u003c\/p\u003e\n\u003cimg alt=\"model specifications table comparing supported series strings, balance current, continuous current, interfaces, and dimensions\" loading=\"lazy\" src=\"https:\/\/tsolar.top\/cdn\/shop\/files\/JKBMS-B1A20S15P-7S-20S-Active-Balance-BMS-Balance-Current-1A_37618e5d-edd9-4592-8ca8-4d80a384817e.jpg?v=1780115980\"\u003e\u003cp\u003eUse the model comparison table to confirm supported series count, balancing current, continuous current rating, and interface options before ordering.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"JIKONG","offers":[{"title":"Default Title","offer_id":52312366547218,"sku":"jk-2705-","price":107.67,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0863\/2860\/6994\/files\/JKBMS-7S-24S-Active-Balance-BMS-Balance-Current-0.6A-2A-Continuous-Current-100A-200A-Lifepo4-li-ion-LTO-Battery-5-1_c0157da5-b22a-47f7-87c8-0adda8d913ba.jpg?v=1780068164","url":"https:\/\/tsolar.top\/products\/src-jk-2705-jkbms-b1a20s15p-7s-20s-active-balance-bms-balance-current-1a-continuous-current-150a-lifepo4-li-ion-lto-battery","provider":"TSolar","version":"1.0","type":"link"}