Overview
The JKBMS BD6A20S15P is an active balance smart BMS for LiFePO4, Li-ion, and LTO battery packs. It supports 7S to 20S battery strings (by chemistry) with 150A continuous charge/discharge current, built-in Bluetooth for Android/iOS monitoring, and RS485 communication (default).
Key Features
- Active balancing: 600mA (0.6A), Active Balance (Full State On)
- Supported battery strings: Li-ion 7S-20S; LiFePO4 8S-20S; LTO 12S-20S
- Continuous current: 150A (charge) / 150A (discharge)
- Maximum discharge current (MAX 2min): 300A
- Built-in Bluetooth: supports Android / iOS phone
- Communication: RS485 (default); CANBUS/HEAT (customized)
- Same-port wiring: Common Port / Same port
- Protection functions (as listed): over charge, over discharge, over current, short circuit, “all-in protection” (cable drop/poor contact), over temperature
Specifications
| Model | BD6A20S15P |
| Balance method | Active Balance (Full State On) |
| Balance current | 600mA (0.6A) |
| Number of battery strings (Li-ion) | 7S-20S |
| Number of battery strings (LiFePO4) | 8S-20S |
| Number of battery strings (LTO) | 12S-20S |
| Wiring output | Common Port |
| Power supply mode | The battery pack is self-powered |
| Continuous charge current | 150A |
| Continuous discharge current | 150A |
| Maximum discharge current (MAX 2min) | 300A |
| Over charge protection current (ADJ) | 10-150A |
| Conductive resistance in main circuit | 0.65mΩ |
| Single cell voltage detection range | 0-5V, error <10mV over full operating range, typical error value <5mV |
| Single cell voltage range | 1-5V |
| Voltage acquisition accuracy | ±5mV |
| Total voltage detection range | 0-100V, <0.5%FSR (FSR=full scale) |
| Current sense shunt | -150A~300A, Error <0.5%FSR |
| SoC estimation accuracy | Error <8% (operating conditions) |
| Battery remaining capacity | error range is less than 8% |
| Total Cycle AH | Cumulative value is half of the charge/discharge value |
| Over charge protection voltage | 1.2-4.35V Adjustable |
| Over charge release voltage | 1.2-4.35V Adjustable |
| Over discharge protection voltage | 1.2-4.35V Adjustable |
| Over discharge release voltage | 1.2-4.35V Adjustable |
| Over current detect delay | 2~120S Adjustable |
| Quantity of temperature detection | 3Pcs |
| Temperature detection | -40~125°C |
| Operating temperature | -40~85°C |
| Storing temperature | -40~95°C |
| Temp protection | YES |
| Short circuit protection | YES |
| Coulomb counter | YES |
| Bluetooth function | Support for Android & IOS phone |
| Other interfaces (default) | RS485 |
| Other interfaces (customized) | CANBUS/HEAT |
| Operating power consumption | <5mA (without communication) / 15mA (485/CAN) |
| Standby power consumption | <2mA |
| Size | 162*102*20mm |
For configuration and communication/interface selection support (RS485, CANBUS/HEAT), contact service@tsolar.top.
Bluetooth App (as described)
- Download the specified Bluetooth application and activate the BMS.
- Open the Bluetooth application and find the relevant serial number, then check all the data.
Smart Energy Working Mode Switching (as described)
- Storage Mode: for transportation/storage/offline or wireless transmission off; does not consume battery pack current.
- Normal Working Mode: inserting the charger returns the BMS to normal working mode; protection, equalization, and communication functions return to normal working.
- Standby Mode: when the pack is static (no charge/discharge current and no equilibrium current), the BMS enters standby after a set time; 1-30 days can be set.
- Shutdown: the BMS has an automatic shutdown voltage and automatically shuts down when a cell falls below the shutdown voltage.
Interfaces / Connector Notes (as labeled)
- CANBUS (Need customization)
- RS485 (BY default)
- LCD (BY default)
- Heat Function (Need customization)
- CAN/RS485 area pin labels: GND, CAN_H, CAN_L
- RS485 area pin labels: GND, RX, TX, VCC
- LCD area pin labels: K-, K+, GND, B, A, VCC
Notes on Other Model Text Visible in Graphics
- Some promotional images include specifications for other JK BMS models (e.g., JK-BD6A17S6P and JK-B2A20S20P-H-C). These values are not specifications of the BD6A20S15P unless they also appear in the specifications above.
Applications
- LiFePO4, Li-ion, or LTO battery packs requiring active balancing and smart monitoring
- Battery systems needing Bluetooth monitoring plus RS485 communication (default)
Details
JKBMS active-balance smart BMS for multi‑string battery packs, with Bluetooth monitoring and configurable protections.
Designed for lithium battery packs across multiple chemistries, with RS485 communication standard and CAN options available.
Internal board layout highlights the compact stacked design, power components, and multi-pin harness connections.
Connectivity includes RS485 by default, plus headers for LCD and GPS; CANBUS and heating control are available by customization.
Bluetooth app monitoring puts pack voltage, charge/discharge current, SoC, and per‑cell voltage data at a glance.
Set battery chemistry and review detailed cell readings, including wire resistance and balance status, from the mobile interface.
Comprehensive protection coverage includes over/under‑voltage, over‑current, short‑circuit, over‑temperature, and cable/contact fault protection.
Power modes help manage self-consumption during storage and long idle periods while returning to normal operation during charging.
Use the model comparison chart to confirm supported series count, active-balance current, continuous/peak current ratings, and interface options.
