AC Grid Frequency Outside Allowable Range

What does Fac-Bfr/Fac-Srr mean?

The AC grid frequency has exceeded or fallen below the allowable operating range for the Sunny Boy SB50US-80US-IUS094030. The inverter interprets this as a public grid outage and disconnects from the grid to prevent islanding. 'Bfr' and 'Srr' are internal processor messages.

• AC grid frequency exceeding the allowed upper limit (<fac Max).
• AC grid frequency falling below the allowed lower limit (>fac Min).
• Rapid change in grid frequency.

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.