Overvoltage on DC side (PV1)

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.

• Overvoltage on the DC side (PV1).
• Incorrect PV array sizing (too many modules in series).

Click steps to track your progress.

1. 1

   Disconnect the PV1 string using the DC disconnector and measure the open-circuit voltage (Voc) of the PV1 string.

2. 2

   Compare the measured Voc with the maximum DC input voltage specification of the Fronius Primo GEN24 208-240 inverter.

3. 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. 4

   Check for any miswiring or faulty components in the PV1 string that could cause abnormal voltage readings.

5. 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.