Transformer Connected to Wrong Grid Configuration

What does XFMR mean?

The Sunny Boy SB50US-80US-IUS094030's internal transformer is incorrectly connected or configured for the present grid type. This issue can manifest in Delta corner-grounded grids if the grid ground is not connected to terminal L2, or in unbalanced 208V/240V grids if L1 and L2 are interchanged.

• Incorrect transformer connection to the grid.
• Grid ground not connected to terminal L2 in Delta corner-grounded grids.
• L1 and L2 interchanged in unbalanced 208V and 240V grids.

Click steps to track your progress.

1. 1

   Check the physical connection of the inverter's transformer to the grid terminals.

2. 2

   In Delta corner-grounded grids, ensure that the grid ground is correctly connected to terminal L2.

3. 3

   In unbalanced 208V and 240V grids, attempt interchanging the L1 and L2 connections to clear the error.