SMA America, LLC Troubleshooting
SB50US-80US-IA-en-36 SB50US-80US-IA-en-36 79
Interference VacL1-Ocu, VacL2-
Ocu, VacL1-Srr, VacL2-
Srr
Voltage is too high or too low on the indicated
branch.
Interference VpvMax
!PV Overvoltage!
!Disconnect DC!
The DC input voltage is exceeding the maximum
tolerable value.
Disconnect the DC line immediately.
Interference Watchdog Watchdog for operation control triggered.
Interference XFMR The transformer is connected to the wrong grid.
Check the connection of the transformer.
For grounded Delta grids: Monitor whether the
grid grounding conductor is connected to
terminal L2.
In the event of unbalanced load in 200 V and
240 V grids, swapping L1 and L2 may rectify the
fault.
Interference XFMR_TEMP_F High transformer temperature. The Sunny Boy
stops and the fans run at maximum speed.
Warning XFMR_TEMP_W After the reduction of the high transformer
temperatures, the Sunny Boy restarts. Monitor the
function of the fans.
Error type Error code Description
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