Overview
The JKBMS B1A8S20P is an active balance smart BMS (Battery Management System) for LiFePO4, Li-ion, and LTO battery packs. It supports 3S–8S pack configurations (chemistry-dependent) with 1A active balancing and 200A continuous charge/discharge capability, plus built-in Bluetooth monitoring for Android/iOS.
Key Features
- Active balancing: Active Balance (Full State On), balance current 1000mA (1A).
- High current capability: Continuous charge current 200A; continuous discharge current 200A; maximum discharge current 350A (MAX 2min).
- Supported battery strings (by chemistry): Li-ion 3S–8S; LiFePO4 4S–8S; LTO 6S–8S.
- Built-in Bluetooth: Supports Android / iOS phone. Use the specified Bluetooth application to activate the BMS; search the relevant serial number to view data.
- Communications: RS485 (default). CANBUS/HEAT (customized).
- Protections supported: 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: Storage Mode, Normal Working Mode, Shutdown, Standby Mode (standby set time: 1–30 days can be set).
Specifications
| Model | JKBMS B1A8S20P |
|---|---|
| Balance method | Active Balance (Full State On) |
| Balance current | 1A (1000mA) |
| Number of battery strings (Li-ion) | 3S–8S |
| Number of battery strings (LiFePO4) | 4S–8S |
| Number of battery strings (LTO) | 6S–8S |
| Wiring output / wiring method | Common port (same port) |
| Power supply mode | The battery pack is self-powered |
| Continuous charge current | 200A |
| Continuous discharge current | 200A |
| Maximum discharge current | 350A (MAX 2min) |
| Over charge protection current (ADJ) | 10–200A |
| Current sense shunt | -150A to 300A, error < 0.5% FSR |
| Total voltage detection range | 0–100V, < 0.5% FSR (FSR = full scale) |
| Single cell voltage detection range | 0–5V, error < 10mV over full operating range; typical error < 5mV |
| Single cell voltage range | 1–5V |
| Voltage acquisition accuracy | ±5mV |
| Support single cell voltage dropout detection | Yes |
| 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 |
| Conductive resistance in main circuit | 0.47mΩ |
| Temperature detection range | -40 to 125°C |
| Quantity of temperature detection | 3Pcs |
| Temp protection | Yes |
| Short circuit protection | Yes |
| Coulomb counter | Yes |
| 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 |
| Operating temperature | -40 to 85°C |
| Storing temperature | -40 to 95°C |
| Other interfaces (default) | RS485 |
| Other interfaces (customized) | CANBUS/HEAT |
| Size | 153*136*18mm |
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 battery packs: 4S–8S
- Li-ion battery packs: 3S–8S
- LTO battery packs: 6S–8S
For pre-sales selection and post-sales technical support, contact https://tsolar.top/ or email service@tsolar.top.
Details
Get active balancing with a smart BMS platform designed for multi‑string lithium battery packs.
Higher-current configurations are available for builds that need up to 200A continuous charge/discharge capability.
A compact enclosure integrates the control board, balancing circuitry, and high-current power path in one unit.
RS485 is the default communication option, with CANBUS and heating function available as custom connections.
Built-in Bluetooth support lets you monitor pack status and cell-level voltage data from an Android or iOS phone.
Quick setup includes scanning for the device, selecting battery chemistry, and viewing live operating data.
Comprehensive protections help guard against over-charge/discharge, over-current, short-circuit, and over-temperature events.
Operating modes support long-term storage, normal use, automatic standby after a set time, and shutdown behavior.
Use the model comparison table to confirm string count support, balancing current, and interface options before ordering.
