AC Grid Voltage Outside Allowable Range

What does Vac-Bfr/Vac-Srr mean?

The AC grid voltage has exceeded or fallen below the allowable operating range for the Sunny Boy SB50US-80US-IUS094030. This can also be caused by a disconnected grid or a disconnected AC cable. The inverter assumes a public grid outage and disconnects to prevent islanding. 'Bfr' and 'Srr' are internal processor messages.

• AC grid voltage exceeding the allowed upper limit (>Vac Max).
• AC grid voltage falling below the allowed lower limit (<Vac Min).
• Disconnected public grid.
• Disconnected AC cable to the grid.
• Rapid change in grid voltage.

Click steps to track your progress.

1. 1

   Check the condition of the grid at the AC terminal blocks within the Sunny Boy SB50US-80US-IUS094030.

2. 2

   Inspect the AC disconnect between the Sunny Boy and the grid.