Overview
JKBMS BD6A20S12P is an active balance smart BMS (battery management system) for LiFePO4, Li-ion, and LTO battery packs, featuring 0.6A (600mA) active balancing and 120A continuous charge/discharge capability. It is battery-pack self-powered and includes built-in Bluetooth for monitoring via Android/iOS.
Key Features
- Battery string support: Li-ion 7S-20S; LiFePO4 8S-20S; LTO 12S-20S
- Active balance: Active Balance (Full State On), balance current 600mA (0.6A)
- Current capability: 120A continuous charge current; 120A continuous discharge current; maximum discharge current 250A (MAX 2min)
- Bluetooth monitoring: built-in Bluetooth; supports Android/iOS. Download the specified Bluetooth application, activate the BMS, then search the relevant serial number to view data.
- Interfaces: RS485 (default); CANBUS/HEAT (customized)
- Cell/pack measurement: supports single cell voltage dropout detection; total voltage detection range 0-100V; current sense shunt -150A to 300A
- Protections (six security protection): over charge protection; short circuit protection; over discharge protection; over current protection; all-in protection (cable drop/poor contact); over temp protection
For configuration support and after-sales assistance, contact https://tsolar.top/ or service@tsolar.top.
Specifications
| Model | BD6A20S12P |
| 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 |
| Continuous current | 120A |
| Continuous charge current | 120A |
| Continuous discharge current | 120A |
| Maximum discharge current (MAX 2min) | 250A |
| Over charge protection current (ADJ) | 10-120A |
| Conductive resistance in main circuit | 0.65 mΩ |
| Power supply mode | The battery pack is self-powered |
| Wiring output / wiring method | Common Port / same port |
| 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 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 |
| Operating power consumption | <5mA (without communication) / 15mA (485/CAN) |
| Standby power consumption | <2mA |
| Temperature detection | -40 to 125°C |
| Operating temperature | -40 to 85°C |
| Storing temperature | -40 to 95°C |
| Quantity of temperature detection | 3 pcs |
| 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 |
| 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 | 2-120 s adjustable |
| Size | 162*102*20mm |
Interfaces & Pin Notes
- CANBUS: need customization (pins labeled: GND, CAN_H, CAN_L)
- RS485: by default (pins labeled: GND, RX, TX, VCC)
- LCD: by default (pins labeled: K-, K+, GND, B, A, VCC)
- Heat function: need customization
Smart Energy Working Mode Switching
- Storage Mode: In transportation, storage, offline or wireless transmission off mode, the BMS is in storage mode, which does not consume battery pack current.
- Normal Working Mode: When the charger is inserted in the storage mode and off mode, the BMS will immediately return to the normal working mode, and all the protection functions, equalization functions and communication functions will return to normal working.
- Shutdown: The BMS has an automatic shutdown voltage, and automatically shuts down when a cell falls below the shutdown voltage.
- Standby Mode: When the battery pack is in a static state (no charge/discharge current and no equilibrium current), the BMS will automatically enter standby after the set time (1-30 days can be set) is exceeded.
Applications
- LiFePO4, Li-ion, and LTO battery packs within the supported series range (7S-20S / 8S-20S / 12S-20S)
- Battery packs requiring active balancing, Bluetooth monitoring, and RS485/CAN communication options
Details
Active-balancing smart BMS hardware helps keep multi-cell packs more consistent across charge and discharge.
RS485 is the default communication interface, with CANBUS and heating control available as custom options on supported versions.
Built-in Bluetooth lets you check pack status, cell voltages, and balance behavior from an Android or iOS app.
Layered protection features cover common fault conditions such as overcharge, overdischarge, short circuit, overcurrent, and overheating.
Smart working modes support long-term storage and standby behavior to reduce unnecessary battery pack drain.
