Yellow LED blinks twice — Grid failure

What does Yellow LED blinks twice mean?

The inverter has detected a problem with the utility grid, such as voltage or frequency being outside acceptable limits, or rapid changes in these parameters. The inverter will not connect to the grid under these conditions for safety.

• Low grid voltage (<Vac Min).
• High grid voltage (>Vac Max).
• Low grid frequency (< fac Min).
• High grid frequency (> fac Max).
• Rapid change in grid frequency or voltage.

Click steps to track your progress.

1. 1

   Inspect the AC disconnect switch between the Sunny Boy and the main grid connection.

2. 2

   Have qualified personnel check the condition of the grid at the AC terminal blocks within the Sunny Boy.

3. 3

   If the grid conditions seem stable, contact your utility provider to inquire about any known grid issues in your area.