DC Over Voltage

What does 103 mean?

A major fault caused by excessive PV string output voltage, where the open-circuit voltage of the PV string exceeds the maximum operating voltage of the SUN2000. This can damage the inverter's DC input stage and prevents power generation.

• Too many PV modules connected in series, resulting in the PV string open-circuit voltage being greater than the maximum operating voltage of the SUN2000.

Click steps to track your progress.

1. 1

   Check the number of PV modules connected in series for the affected string.

2. 2

   Reduce the number of PV modules connected in series until the PV string output voltage drops to the specified operating range for the SUN2000.