Operating Procedure for Grid Control

The grid management service requests the utility grid.

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Open, the battery-backup grid is not connected to the utility grid.

The grid voltage is within the specified thresholds for voltage and frequency.

In order that the grid management service can detect a valid voltage, the utility grid must be within the thresholds for voltage and frequency for a minimum time.

If the grid management detects a valid voltage, the Sunny Island synchronizes the battery-backup grid with the utility grid.

The battery-backup grid is synchronized.

The Sunny Island connects the battery-backup grid to the utility grid.

Closed, the battery-backup grid is connected to the utility grid.

The battery-backup grid is connected to the utility grid.

The utility grid feeds current into the battery-backup grid.

The grid management service no longer requests the utility grid.

The Sunny Island disconnects the battery-backup grid from the utility grid and supplies the battery-backup grid.

Open, the battery-backup grid is not connected to the utility grid.