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AS/NZS 5139-2019
What a BMS Does — and Why It's Mandatory
A Battery Management System (BMS) is the electronic brain of a lithium battery pack. It monitors individual cell voltages, temperatures, and current; calculates state of charge and state of health; and protects the battery from conditions that would cause permanent damage or safety hazards. AS/NZS 5139 makes a functional BMS mandatory for all lithium BESS in Australia.
BMS Protection Functions
Protection | Trigger | Action |
|---|---|---|
Over-voltage per cell | Cell voltage exceeds 3.65 V (LiFePO4) | Disconnect charge MOSFET — stop charging |
Under-voltage per cell | Cell voltage below 2.5 V (LiFePO4) | Disconnect discharge MOSFET — stop discharging |
Over-temperature (charge) | Cell temperature above 45°C during charge | Reduce or stop charging current |
Over-temperature (discharge) | Cell temperature above 60°C during discharge | Reduce or stop discharge current |
Overcurrent (charge) | Current exceeds rated maximum charge current | Disconnect charge circuit |
Short circuit | Current exceeds maximum instantaneous limit | Instantaneous disconnect (within microseconds) |
Cell imbalance | Voltage difference between cells exceeds threshold | Enable cell balancing (passive or active) |
BMS Communication — Integration with Inverter
For residential solar-storage systems, the BMS must communicate with the hybrid inverter to coordinate charging and discharging. Common communication protocols:
CAN bus — most common for Pylontech, BYD, CATL battery modules; inverter reads SoC, max charge/discharge current, alarm status
RS485 / Modbus RTU — used by some lead-acid-compatible BESS and older lithium systems
RS232 — legacy protocol for some older battery systems
MQTT / cloud API — for remote monitoring and fleet management
When the BMS communicates max charge/discharge current limits to the inverter in real time, the system can safely extract maximum performance from the battery without requiring conservative fixed current settings. Always confirm BMS-inverter compatibility before specifying a battery model.
Engr. Jason Morales — Founder, SolarEnergyPH
