Overview
The JKBMS B1A20S15P is an active balance smart BMS (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.
Key Features
- Active balancing: Active Balance (Full State On), balance current 1000 mA (1A).
- High current design: 150A continuous charge current and 150A continuous discharge current; maximum discharge current 300A (MAX 2 min).
- Bluetooth monitoring: Bluetooth built-in; supports Android & iOS phones. Use the specified Bluetooth app to activate the BMS, then search the relevant serial number to view data.
- Communications: RS485 (default). CANBUS/HEAT listed as customized.
- Cell/pack measurement: Single cell voltage range 1–5V (detection range 0–5V); total voltage detection range 0–100V.
- Protection functions: Over charge protection, over discharge protection, over current protection, short circuit protection, over temperature protection, and “all-in protection” (cable drop/poor contact).
- Operating modes (as described): 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).
For configuration and after-sales support, contact service@tsolar.top.
Specifications
| Model | B1A20S15P |
| Supported battery strings (Li-ion) | 7S–20S |
| Supported battery strings (LiFePO4) | 8S–20S |
| Supported battery strings (LTO) | 12S–20S |
| Balance method | Active Balance (Full State On) |
| Balance current | 1A (1000 mA) |
| Power supply mode | The battery pack is self-powered |
| Wiring / port | Common Port (same port) |
| Continuous charge current | 150A |
| Continuous discharge current | 150A |
| Maximum discharge current | 300A (MAX 2 min) |
| Over charge protection current (adjustable) | 10–150A |
| Conductive resistance in main circuit | 0.65 mΩ |
| Single cell voltage detection range | 0–5V; error <10 mV over full operating range; typical error <5 mV |
| Single cell voltage range (supported) | 1–5V |
| Voltage acquisition accuracy | ±5 mV |
| Support single cell voltage dropout detection | Yes |
| Total voltage detection range | 0–100V; <0.5% FSR (FSR = full scale) |
| Current sense shunt | -150A to 300A; error <0.5% FSR |
| SoC estimation accuracy | Error <8% (operating conditions) |
| Battery remaining capacity accuracy | Error range is less than 8% |
| Total Cycle AH cumulative value | Half of the charge/discharge value |
| Over charge protection voltage (adjustable) | 1.2–4.35V Adjustable |
| Over charge release voltage (adjustable) | 1.2–4.35V Adjustable |
| Over discharge protection voltage (adjustable) | 1.2–4.35V Adjustable |
| Over discharge release voltage (adjustable) | 1.2–4.35V Adjustable |
| Over current detect delay (adjustable) | 2–120 s Adjustable |
| Temperature detection range | -40 to 125°C |
| Quantity of temperature detection | 3 pcs |
| Operating temperature | -40 to 85°C |
| Storing temperature | -40 to 95°C |
| Operating power consumption | <5 mA (without communication) / 15 mA (485/CAN) |
| Standby power consumption | <2 mA |
| Short circuit protection | Yes |
| Temp protection | Yes |
| Coulomb counter | Yes |
| Bluetooth function | Support for Android & iOS phone |
| Other interfaces (default) | RS485 |
| Other interfaces (customized) | CANBUS/HEAT |
| Size | 162*102*20 mm |
Interface Notes (as labeled)
- CANBUS (need customization): GND, CAN_H, CAN_L
- RS485 (by default): GND, RX, TX, VCC
- LCD (by default): K-, K+, GND, B, A, VCC
- Heat function (need customization)
Applications
- LiFePO4, Li-ion, and LTO battery packs requiring active balancing and smart monitoring
- Energy storage battery packs and other multi-series lithium battery systems (within the supported string counts and voltage ranges)
Notes on Model Labels Found in Provided Graphics
- Some 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).
Details
Skip balancing losses and help keep multi‑series packs aligned with an active balancer design for Li‑ion, LiFePO4, or LTO systems.
Built‑in communications options like RS485 (default) support monitoring and integration for higher‑current battery builds.
Layered construction highlights the main control board and connection interfaces used for cell sensing and power handling.
Clear port labeling helps with wiring for RS485 by default, plus optional CANBUS, display (LCD), and heating connections.
Bluetooth monitoring provides real‑time pack stats, cell voltages, and balance current from a phone app on iOS or Android.
Switch chemistry settings, scan for the BMS, and review individual cell readings and wiring resistance in the same app.
A full set of protections covers common fault conditions including over‑charge, over‑discharge, over‑current, short circuit, and over‑temperature.
Multiple operating modes support storage, normal use, standby timing, and automatic shutdown based on low‑cell conditions.
Use the model comparison table to confirm supported series count, balancing current, continuous current rating, and interface options before ordering.
