Check the electrical operating window
Confirm the inverter or PCS minimum and maximum DC voltage against the battery’s cell count, charge limit, discharge limit, and expected voltage under load. Also compare continuous and peak charge and discharge current with the cells, BMS, contactors, cables, breakers, busbars, and thermal design.
Check the communication protocol
Confirm whether the equipment uses CAN, RS485, Modbus, or another protocol and obtain the exact protocol version. Match baud rate, identifier or register map, scaling, byte order, update rate, cable pinout, termination, addresses, and master-slave roles.
Check operating-state logic
The inverter and BMS must agree on charge enable, discharge enable, contactor state, pre-charge sequence, current limits, state of charge, alarms, warnings, shutdown conditions, and restart behaviour. A system can exchange data yet still operate incorrectly if state logic differs.
- Confirm normal startup and shutdown sequence.
- Test low- and high-voltage warnings and protective shutdowns.
- Test temperature, current, insulation, and communication-loss responses where applicable.
- Verify how the system recovers after a fault and whether manual acknowledgement is required.
Commission before full-power operation
Begin with controlled settings and verify measurements on both devices. Confirm voltage, current direction, state of charge, charge and discharge limits, alarms, and contactor behaviour before increasing power. Record firmware versions, settings, cable pinout, and protocol files for future service.