Overview
The JKBMS (Jikong) JK-B2A20S20P-HC is an active balance smart BMS for LiFePO4, Li-ion, and LTO battery packs, supporting 7S to 20S configurations (chemistry-dependent). It combines 2A active balancing (Full State On), 200A continuous charge/discharge capability, Bluetooth monitoring for Android/iOS, and support for battery heating via a built-in heating chip. The battery pack is self-powered.
Key Features
- Active balancing: Active Balance (Full State On), balance current 2000mA (2A).
- Battery string support: Li-ion 7S20S; LiFePO4 8S20S; LTO 12S20S.
- High current rating: 200A continuous charge current; 200A continuous discharge current; maximum discharge current 350A (MAX 2min).
- Heating support: Supports battery heating function (built-in heating chip). (Heat function is also shown as a customizable interface/port.)
- Communication & monitoring: Built-in Bluetooth module; supports Android/iOS phones. Other interfaces: RS485 (default). CANBUS/HEAT (customized).
- Protections: Over charge protection; over discharge protection; over current protection; short circuit protection; all-in protection (prevents cable drop/poor contact); over temperature protection.
- Operating modes: Storage Mode; Normal Working Mode; Shutdown (below shutdown voltage); Standby Mode (130 days can be set). Charging activates return to normal working mode.
Specifications
| Model | JK-B2A20S20P-HC |
| Balance method | Active Balance (Full State On) |
| Balance current | 2A (2000mA) |
| Number of battery strings (general) | 7S to 20S |
| Number of battery strings (Li-ion) | 7S-20S |
| Number of battery strings (LiFePO4) | 8S-20S |
| Number of battery strings (LTO) | 12S-20S |
| Wiring output / method | Common Port (Same Port) |
| Continuous charge current | 200A |
| Continuous discharge current | 200A |
| Maximum discharge current (MAX 2min) | 350A |
| Over charge protection current (ADJ) | 10-200A |
| Over current detect delay | 2~120S Adjustable |
| Conductive resistance in main circuit | 0.47ma9 |
| Power supply mode | The battery pack is self-powered |
| Single cell voltage supported | 1-5V |
| Single cell voltage detection range | 0-5V |
| Single cell voltage detection accuracy | Error <10mV over full operating range; typical error <5mV |
| Voltage acquisition accuracy | 5mV |
| Single cell voltage dropout detection | Supported |
| Total voltage detection range | 0-100V |
| Total voltage detection accuracy | <0.5%FSR (FSR = full scale) |
| Current sense shunt range | -150A~300A |
| Current sense shunt accuracy | 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 | 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 |
| Temperature detection | -40~125c |
| Quantity of temperature detection | 3Pcs |
| Temperature 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 |
| Operating temperature | -40~85c |
| Storing temperature | -40~95c |
| Size | 162*102*20mm |
Interfaces / Pin Labels (as marked)
- 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): Heat Function connector/port
Bluetooth App Notes
- Download the specified Bluetooth application and activate the BMS.
- Open the Bluetooth application and find the relevant serial number to check data.
Applications
- LiFePO4 battery packs (8S-20S), Li-ion battery packs (7S-20S), and LTO battery packs (12S-20S)
- Battery systems requiring 2A active balancing and up to 200A continuous charge/discharge
For configuration and compatibility questions (RS485/CANBUS/heat options, wiring, and setup), contact support at https://tsolar.top/ or service@tsolar.top.
Notes from Series Graphics
- A separate series graphic references model JK-BD6A17S6P with: Active Balance Current 0.6A; Adapt Battery Strings 10S-17S (LTO), 7S-17S (Li-ion), 8S-17S (LiFePO4); Continuous Discharge/Charge Current 60A; and a device label stating Peak current 100A and Battery Strings 03-17S.
Details
The JK-B2A20S20P-HC combines 2A active balancing with up to 200A continuous charge/discharge for 7S–20S packs (chemistry dependent).
RS485 communication is standard, with optional CANBUS and heating connections depending on your build requirements.
Bluetooth monitoring in the mobile app provides live pack stats plus per-cell voltage readings for quick health checks.
Selectable operating modes support storage, normal use, standby, and low-voltage shutdown behavior.
A side-by-side spec table makes it easier to match the correct JK-series BMS to your string count, current needs, and interface options.
