SMA Solar Technology AG
Installation Guide SB50US-80US-IUS094030 89
Disturbance XFMR Transformer is connected to the wrong grid.
Check the connection of the transformer.
In Delta corner grounded grids make sure that the
Ground of the grid is connected to the terminal L2
In unbalanced 208 V and 240 V grids
interchanging L1 and L2 may clear this error.
Disturbance XFMR_TEMP_F High transformer temperature, the Sunny Boy
stops working and the fans work with maximum
speed.
Warning XFMR_TEMP_W High transformer temperature is gone. The Sunny
Boy starts working and shows the failure
“XFMR_TEMP_W“. Check the function of the
fans.
Error Type Error Code Description
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