Vac-Bfr / Vac-Srr - AC grid voltage out of range

What does Vac-Bfr, Vac-Srr mean?

The voltage of the AC grid is outside the acceptable operating range for the Sunny Boy. The inverter assumes the public grid is down and disconnects to prevent 'islanding'. This is a disturbance message.

• Public grid voltage too high or too low
• Disconnected grid
• Disconnected AC cable.

Click steps to track your progress.

1. 1

   Check if the public grid is operational and stable in your area.

2. 2

   Verify the AC cable between the Sunny Boy and the grid is securely connected.

3. 3

   If the grid voltage appears to be within the tolerable range and the message persists, contact SMA America technical support.