The battery protection mode protects the battery.

If the state of charge (SOC) of the battery falls below the thresholds, battery protection mode is activated. In battery protection mode, the Sunny Island switches to energy-saving mode or switches itself off. The battery protection mode has 3 levels. 1 state of charge threshold can be set for each level. Level 1 and 2 of the battery protection mode have specific start and end times and are therefore dependent on the time of day ( > Setting Time-Dependent Functions).