Explanation of Used Terms

SMA Energy System Home

In the SMA Energy System Home (storage system), the Sunny Island uses the connected battery for the intermediate storage of excess PV energy for increased self-consumption.

Battery-backup system

In the event of grid failure, a battery-backup system supplies loads with energy and a PV system disconnected from the utility grid with voltage.

External energy source

Grid-forming generators such as electric generators or utility grids

Off-grid system

All components belonging to the stand-alone grid (e.g., Sunny Island)

Grid failure

Utility grid failure or deviation from the country-specific thresholds for voltage and frequency

Automatic transfer switch with battery-backup function

disconnects the battery-backup grid from the utility grid in the event of grid failure.