JK Smart Active Balance BMS Board 3S-8S 200A 1A Balance Current With UART/RS-485

 The JK Smart Active Balance BMS Board 3S–8S 200A (1A Balance Current, with UART / RS-485) is a high-performance battery management solution tailored for demanding lithium battery systems. It combines robust protection features, active balancing, and advanced communications for real-time monitoring and control.

Core Specifications & Features

  • Series support (3S–8S): Compatible with battery packs having 3 to 8 cells in series, making it versatile for systems ranging from 9.6 V up to approximately 33 V (depending on cell voltage).

  • 200A continuous current: Able to support high current draw applications, making it suitable for electric vehicles, heavy-load inverters, or high-power battery packs.

  • 1A active balance current: Instead of passive balancing, this BMS actively redistributes charge among cells at up to 1 A, helping keep cell voltages tightly matched and improving longevity and performance under stress.

  • UART & RS-485 interfaces: Allows external systems (microcontrollers, PCs, BMS master units) to query the board’s data, adjust parameters, log events, and integrate into larger battery management networks.

  • Protection capabilities: Offers comprehensive safety functions including over-charge protection, over-discharge protection, over-current protection, short-circuit protection, and temperature monitoring to guard cells and the pack.

  • Voltage and cell monitoring: Each cell’s voltage is continuously sampled, enabling precise balancing and fault detection on a per-cell basis.

  • Self-powered from pack: The board typically draws its own operating power from the battery pack it monitors, simplifying external wiring.

  • Compact, modular design: Often built with standardized connectors for balance leads and communication lines, suitable for embedding into battery modules or enclosures.

Applications & Strengths

This BMS is well suited for mid-to-high power uses such as electric scooters, e-bikes with high power needs, small electric vehicles, electric wheelchairs, solar home systems, portable power banks, or robotics. The 200A current capability gives ample headroom for dynamic loads, while active balancing ensures the cell pack stays healthy under stress.

The communication interfaces are especially beneficial when you need remote monitoring, logging, or integration with a broader energy management system. You can monitor cell voltages, temperatures, current flows, and trigger alerts or shut-downs if problems arise.

Practical Tips & Considerations

  • Use appropriately thick wiring and connectors rated for 200A to minimize voltage drop and heating.

  • Provide cooling or thermal management near the BMS, since high currents generate heat in MOSFETs and internal components.

  • Ensure proper connection of balance leads in correct sequence; miswiring could damage the module.

  • When configuring via UART/RS-485, set threshold parameters (over-voltage, under-voltage, over-current, temperature limits) aligned with your specific cell chemistry and your system’s safety margin.

  • Leave some margin in current rating: avoid running the BMS continuously at its maximum spec.

  • Test the system under partial loads first to confirm correct behavior before pushing to full load.


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