Overvoltage on DC side (PV1)
Fronius · Primo GEN24
What does 505 mean?
The Fronius Primo GEN24 208-240 inverter has detected an excessively high voltage from the PV1 string on the DC side, exceeding its maximum input voltage rating. This can lead to inverter damage.
Common Causes
- Overvoltage on the DC side (PV1).
- Incorrect PV array sizing (too many modules in series).
Repair Steps & Checklist
Click steps to track your progress.
- 1
Disconnect the PV1 string using the DC disconnector and measure the open-circuit voltage (Voc) of the PV1 string.
- 2
Compare the measured Voc with the maximum DC input voltage specification of the Fronius Primo GEN24 208-240 inverter.
- 3
Verify the number of PV modules in series for PV1; ensure it does not exceed the inverter's maximum voltage rating, considering temperature effects (lower temperatures lead to higher Voc).
- 4
Check for any miswiring or faulty components in the PV1 string that could cause abnormal voltage readings.
- 5
If the array configuration is correct and voltage is within limits, restart the inverter to clear the temporary fault. If it reoccurs, contact Fronius service.