DC overvoltage > Disconnect generator
SMA · Sunny Boy Solar Inverter
What does 3401/3402/3407 mean?
An overvoltage condition has occurred at the DC input, which poses a risk of destroying the inverter. This critical message is also signaled by rapid flashing of the LEDs, indicating an immediate need for intervention.
Common Causes
- DC voltage exceeding the maximum input voltage of the inverter.
- PV array has been incorrectly rated for the inverter.
Repair Steps & Checklist
Click steps to track your progress.
- 1
Disconnect the inverter from all voltage sources immediately (refer to the inverter installation manual for the exact procedure).
- 2
Check whether the DC voltage is below the maximum input voltage of the inverter.
- 3
If the DC voltage is below the maximum input voltage of the inverter, reconnect the terminal block with the connected DC conductors to the inverter.
- 4
If the DC voltage exceeds the maximum input voltage of the inverter, ensure that the PV array has been correctly rated or contact the installer of the PV array.
- 5
If this message is repeated frequently, contact Service.