Overcurrent on DC side (PV2)

What does 503 mean?

The Fronius Primo GEN24 208-240 inverter has detected an excessive current flowing from the PV2 string on the DC side. This suggests a potential short circuit within the PV2 array or an improper string configuration.

• Overcurrent on the DC side (PV2).
• Short circuit on the PV array.
• Incorrect PV array sizing or configuration.

Click steps to track your progress.

1. 1

   Disconnect the PV2 string using the DC disconnector and visually inspect all PV modules, wiring, and connectors for any damage or indications of a short circuit.

2. 2

   Measure the open-circuit voltage (Voc) and short-circuit current (Isc) of the PV2 string and compare them against expected values from the module datasheet.

3. 3

   Confirm that the PV2 string configuration (number of modules in series and parallel) adheres to the Fronius Primo GEN24 208-240 inverter's maximum DC current specifications.

4. 4

   Inspect any external DC combiner box or array wiring associated with PV2 for potential short circuit conditions.

5. 5

   If external components are confirmed good, the fault might be internal to the inverter; contact Fronius service.