DC voltage too low for backup power

What does 902 mean?

The DC voltage from the battery is too low to initiate or sustain backup power operation with the Fronius Primo GEN24 208-240 inverter. This indicates the battery is either critically discharged or faulty.

• DC voltage too low for backup power.
• Battery deeply discharged.
• Battery fault.

Click steps to track your progress.

1. 1

   Check the battery's state of charge (SoC) and voltage; ensure it's above the minimum threshold required for backup power. The battery may need charging from the grid (if available) or PV.

2. 2

   Measure the battery voltage at the Fronius Primo GEN24 208-240 inverter's DC terminals to confirm it aligns with the battery's internal readings and is sufficient for backup operation.

3. 3

   Inspect DC cables and connections between the battery and inverter for any issues causing voltage drops.

4. 4

   Refer to the battery manufacturer's manual for specific low-voltage recovery procedures or diagnostics if the battery is faulty or deeply discharged.

5. 5

   Confirm that the battery parameters in the inverter settings are correctly configured for the connected battery model.