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Select Battery on PV master:
Select "SECU-S" on battery page in PV Master Application
Select wrong battery will lead to BMS communication failure.
5.5 Power off
To prevent damages to the battery system, please strictly follow the steps below:
1. Take out the outer shell and the maintenance panel of the control box.
2. Push the handle to"OFF" to turn off the Battery circuit breaker.
3. Confirm that all LED lights are off.