Overcurrent on DC side (Battery)

What does 504 mean?

The Fronius Primo GEN24 208-240 inverter has detected an excessive current flowing to or from the connected battery system on the DC side. This indicates a potential short circuit in the battery DC wiring or an issue with the battery itself.

• Overcurrent on the DC side (battery).
• Short circuit on the battery connection.
• Internal fault in the battery system.

Click steps to track your progress.

1. 1

   Disconnect the battery using the DC disconnector and visually inspect all battery cables, terminals, and connectors for signs of damage or short circuits.

2. 2

   Check the battery's operating status and any error indicators on the battery itself. Consult the battery manual.

3. 3

   Measure the voltage at the battery terminals to ensure it is within the normal operating range.

4. 4

   Verify that the DC cables connecting the battery to the Fronius Primo GEN24 208-240 inverter are correctly sized and free from insulation damage.

5. 5

   If the battery system permits, check for internal fault codes or diagnostics within the battery management system (BMS).