Solar Cellz USA

JKBMS B1A8S20P Active Balance BMS (3S–8S, 200A)

$82.78
$82.78
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A smart battery management system designed for LiFePO₄, Li-ion, and LTO packs. Supports 3–8 cells, with 200A continuous current and 1A active balancing for longer battery life. Features Bluetooth monitoring, RS485/CAN support, and full protection against overcharge, over discharge, overcurrent, and temperature. Compact, efficient, and ideal for solar, EV, and energy storage applications.
Key Features & Benefits

  • Supports 3S to 8S configurations (for Li-ion); 4S to 8S for LiFePO₄; 6S–8S for LTO. 

  • Continuous Current: 200 A, with peak discharge up to ~350 A (2 min max)

  • Active Balancing, 1 A rate (energy transfer type) for superior cell equalization, reduced capacity drift, and extended battery life 

  • High accuracy voltage detection: 0–5 V single cell range, typical error < 5 mV, full range error < 10 mV 

  • Multi-mode protection suite: overcharge, overdischarge, overcurrent (adjustable between 10–200 A), short circuit, overtemperature, etc.

  • Thermal & environmental resilience: operating −40 °C to +85 °C, storage −40 °C to +95 °C

  • Low power consumption: < 5 mA (without communication), standby < 2 mA

  • Smart connectivity & monitoring: built-in Bluetooth (Android/iOS app) + support for RS485 / CAN / heating / optional LCD / GPS interfaces

  • Compact & robust form factor: ~153 × 136 × 18 mm footprint (thickness ~17–18 mm)

  • Common port wiring (shared negative) for ease of integration 

Technical Specifications (at a glance)

Parameter Value / Range
Supported Cell Count 3S–8S (Li-ion); 4S–8S (LiFePO₄); 6S–8S (LTO) 
Continuous Charge / Discharge 200 A 
Peak Discharge (2 min) ≈ 350 A
Balance Current 1 A 
Internal Resistance (main circuit) ~0.3 mΩ 
Cell Voltage Range 1.0 – 5.0 V
Voltage Accuracy ±5 mV
Operating Temperature –40 °C to +85 °C 
Standby Current <2 mA
Dimensions ~153 × 136 × 18 mm 
Interfaces Bluetooth built-in, RS485, (CAN/Heating optional)

Use Cases & Applications

This BMS is ideal for:

  • Solar energy storage systems / off-grid setups

  • Electric vehicles, e-bikes, scooters, golf carts

  • Uninterruptible power supplies (UPS) or backup battery systems

  • DIY battery pack projects / custom Li-ion / LiFePO₄ / LTO builds

Its active balancing and Bluetooth monitoring make it especially suitable for developers seeking tighter control over cell balance and system health.