(ch) Multicluster systems with increased self-consumption and battery-backup function (battery-backup systems) are connnected to the utility grid via an NA Box or a Grid Connect Box.
When the battery-backup system is connected to the utility grid, Sunny Island inverters can use the batteries for intermediate storage of PV energy. The stored PV energy can then be used by your appliances during the evening and nighttime hours. With this, electricity purchased from the grid can be reduced and self-consumption or internal power supply optimized.
The NA Box or Grid Connect Box disconnects the battery-backup system from the utility grid during grid failure. The multicluster system continues to supply power to the loads via the battery-backup grid without interruption. The PV system can synchronize with the battery-backup system and feed in. When the utility grid is available again, the Grid Connect Box connects the battery-backup system to the utility grid.