Overview
The JKBMS BD6A20S20P is an active balance smart BMS (battery management system) for multi-series Li-ion, LiFePO4, and LTO battery packs. It supports 7S to 20S battery strings (chemistry-dependent) with 0.6A active balancing and 200A continuous charge/discharge capability, plus built-in Bluetooth monitoring for Android and iOS.
Key Features
- Battery strings supported: Li-ion 7S-20S; LiFePO4 8S-20S; LTO 12S-20S
- Active balancing: Active Balance (Full State On), balance current 600mA (0.6A)
- High current rating: 200A continuous charge current; 200A continuous discharge current; maximum discharge current 350A (MAX 2min)
- Built-in Bluetooth: supports Android / iOS phone monitoring via the specified Bluetooth application
- Communications: RS485 (default); CANBUS/HEAT (customized)
- Protections listed: over charge, over discharge, over current, short circuit, “all-in” protection (cable drop/poor contact), over temperature
- Power supply mode: battery pack self-powered
- Operating/standby consumption: <5mA (without communication) / 15mA (485/CAN); standby <2mA
For technical selection support, contact service@tsolar.top or visit https://tsolar.top/.
Specifications
| Model | BD6A20S20P |
| Balance method | Active Balance (Full State On) |
| Balance current | 0.6A (600mA) |
| Number of battery strings (Li-ion) | 7S-20S |
| Number of battery strings (LiFePO4) | 8S-20S |
| Number of battery strings (LTO) | 12S-20S |
| Wiring output / wiring method | Common port (same port) |
| Continuous charge current | 200A |
| Continuous discharge current | 200A |
| Maximum discharge current | 350A (MAX 2min) |
| Over charge protection current (adjustable) | 10-200A |
| Conductive resistance in main circuit | 0.47mΩ |
| Single cell voltage supported | 1-5V |
| Single cell voltage detection range | 0-5V |
| Voltage acquisition accuracy | ±5mV |
| Single cell voltage detection error | <10mV over full operating range; typical <5mV |
| Support single cell voltage dropout detection | Yes |
| Total voltage detection range | 0-100V |
| Total voltage detection accuracy | <0.5%FSR (FSR = full scale) |
| Current sense shunt range | -150A to 300A |
| Current sense shunt error | <0.5%FSR |
| SoC estimation accuracy | Error <8% (operating conditions) |
| Battery remaining capacity accuracy | Error range <8% |
| Total Cycle AH cumulative value | Half of the charge/discharge value |
| Operating power consumption | <5mA (without communication) / 15mA (485/CAN) |
| Standby power consumption | <2mA |
| Bluetooth | Built-in; supports Android / iOS phone |
| Other interfaces (default) | RS485 |
| Other interfaces (customized) | CANBUS/HEAT |
| 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 |
| Over current detect delay | 2-120S adjustable |
| 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 |
| Temp protection | Yes |
| Short circuit protection | Yes |
| Coulomb counter | Yes |
| Size | 162*102*20mm |
Ports / Pinout Labels
- 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 / LTO battery packs requiring 7S-20S class management (chemistry-dependent)
- Energy storage battery packs needing active balancing and Bluetooth monitoring
Details
Get active balancing plus high-current charge/discharge control in a compact smart BMS designed for multi‑series lithium packs.
Built-in Bluetooth makes it easy to check pack status, cell voltages, and alarms from a phone app.
A layered internal design integrates sensing, balancing, and communication hardware in a rugged case.
Clear interface headers simplify system integration via RS485 by default, with CAN and other options available by configuration.
Live readings include current, pack voltage, remaining capacity, and per‑cell voltage data for quick troubleshooting.
Smart working modes help reduce standby drain during storage or long periods of non-use.
