Battery Protection Mode

The battery protection mode protects the battery. If the battery state of charge falls below the thresholds, the battery protection mode is activated. In battery protection mode, the Sunny Island switches to standby mode or switches itself off. The battery protection mode has three levels. One state of charge threshold can be set for each level. Levels 1 and 2 of the battery protection mode have specific start and end times and are therefore dependent on the time of day.

Level 1

If the state of charge falls below the threshold for level 1, the Sunny Island switches to standby between the start time and end time. In this way, you can specify preferred times for the stand-alone grid to be switched off in the event of insufficient energy.

Level 2

If the state of charge falls below the threshold for level 2, the Sunny Island switches to standby. During the day, when PV inverters are able to supply energy, the Sunny Island attempts to charge the battery. Using the start time and end time, you specify the time period during which the Sunny Island starts every two hours in order to charge the battery. If no energy is available to charge the battery, the Sunny Island remains on standby.

Level 3

If the state of charge falls below the threshold for level 3, the Sunny Island switches itself off. This protects the battery against deep discharge and severe damage. To charge the battery again, the Sunny Island must be switched on and started manually.

At all three levels, the Sunny Island will only switch to standby mode or switch itself off if no charging current has flowed into the battery for six minutes. You can adapt the thresholds for battery protection mode to the system (for setting the battery protection mode, see the Sunny Island inverter installation manual)