Grid Type Detection Failure

What does Grid-Timeout/Grid-Fault-S mean?

The Sunny Boy SB50US-80US-IUS094030 inverter failed to detect the type of connected grid (208V, 240V, or 277V). This can be caused by incorrect wiring, especially when connecting to specific grid types.

• Incorrect wiring for L1 and N cables when connecting to a 277V grid.

Click steps to track your progress.

1. 1

   If connecting to a 277V grid, verify that the L1 and N cables are in the correct terminal positions.

2. 2

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

3. 3

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