Functions of the Sunny Boy Smart Energy for the Battery-Backup System

Battery-backup operation with empty battery

When the battery is fully discharged during a grid failure, the hybrid inverter cannot initially provide any AC voltage.

If there is sufficiently high PV power, the hybrid inverter charges the battery until a preset state of charge has been reached (usually 5%). If there is no PV power available, the start-up is canceled and no more AC voltage is provided. The hybrid inverter attempts starting up again when a defined waiting time has expired.

After five attempts, the hybrid inverter terminates the start-up and switches to sleep mode.