JK Smart Active Balance BMS Board 3S-8S 200A 2A Balance Current With UART/RS-485

The JK Smart Active Balance BMS Board 3S-8S 200A with 2A Balance Current and UART/RS-485 is a potent and intelligent solution for high-current lithium battery systems that need precise cell management, safety, and remote monitoring. Below is a ~300-word overview without interlinking:

Overview

This BMS is expressly designed to safely protect, monitor, and maximize performance in battery packs with 3 to 8 cells in series. Supporting continuous currents up to 200 amps, it caters to serious loads—electric vehicles, solar power systems, portable energy storage, or high-power DIY projects. What distinguishes it is its active balancing ability with 2A balancing current, combined with UART and RS-485 communication ports for robust monitoring and integration.

Technical Features

  • Series Count (3S-8S): Suitable for battery packs of 3 up to 8 series cells, allowing flexibility in design for different voltage requirements.

  • 200A Continuous Current Rating: Capable of handling high discharge or charge currents without overheating or early wear under specified conditions.

  • 2A Active Balancing: Instead of simply bleeding off excess charge (passive balancing), this board moves charge from higher-voltage cells to lower ones actively. This helps in keeping cells closely balanced, reduces stress, and prolongs usable pack life.

  • Communication Interfaces (UART & RS-485): These allow external monitoring, configuration, data logging, and integration with controllers or smart systems. Through these channels, users can read cell voltages, temperature, over/undervoltage status, current flows, balance activity, etc.

  • Protection Mechanisms: The board includes over-charge, under-charge, over-current, short-circuit, temperature protections, among others. Thresholds are usually adjustable to suit specific cell chemistries.

  • Voltage Sensing Accuracy: Per-cell voltage detection is precise, often with error margins in low millivolts, ensuring reliable data for balancing and safety.

  • Common Port (Same Port for Charge & Discharge): Simplifies wiring, reduces external connection points, and lowers the risk of connection errors.

Applications & Use Cases

Ideal for systems that draw heavy loads or need sustained performance. Examples include:

  • Electric scooters or EVs with high motor draw

  • Off-grid solar / wind battery banks feeding inverters

  • Portable power units or backup power modules

  • DIY battery walls, robotics, and demanding energy storage systems

Because of the active balancing, this BMS is especially helpful when cell matching isn’t perfect or when cells drift with use.

Practical Considerations

  • Wiring & Connectors: Must use heavy gauge wires and solid connectors to handle 200A without large voltage drop or heating.

  • Thermal Management: Even though the board is designed for high current, internal MOSFETs / internal components will heat up; cooling or ventilation matters.

  • Balance current relation to battery capacity: 2A works well for moderate-capacity packs, but for very large packs, balancing will be slower; always check that 2A does not exceed safe balancing limits (often tied to battery Ah rating).

  • Correct configuration: Set thresholds (overvoltage, undervoltage), cell chemistry (LiFePO₄, Li-ion, etc.), temperature limits via the UART/RS-485 interface to match the cells being used.

  • Firmware & monitoring: Use appropriate app or software to monitor behavior, log events—especially early on—to verify everything works as expected.

Conclusion

The JK Smart Board with 3S-8S support, 200A continuous current, 2A active balancing, and UART/RS-485 communication is a strong fit for high-performance battery packs needing both power and precision. It provides a good balance between protection, flexibility, and cell management efficiency. If you like, I can also outline a wiring diagram or compare its performance vs. a 1A balancing variant.

Contact

+𝟭 𝟳𝟳𝟵-𝟳𝟳𝟬-𝟯𝟭𝟬𝟵

https://srikobatteries.com/product/jk-smart-active-balance-bms-board-3s-8s-200a-2a-balance-current-with-uart-rs-485/

kruthala@srikobatteries.com

1585 Beverly CT, Unit 121, Auror

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