23
Battery Overvoltage
Fronius · Perfect Charging
What does 23 mean?
The connected battery's voltage has exceeded the maximum safe limit during or after a charging cycle. This is a critical condition that can lead to excessive gassing, overheating, and potential irreversible damage to the battery if not promptly addressed.
Common Causes
- A malfunction or miscalibration in the battery charger's output voltage regulation circuit.
- An incorrect battery type or nominal voltage setting selected in the charger's configuration, leading to charging at too high a voltage.
- External factors causing voltage spikes or uncontrolled voltage rise on the battery terminals.
Repair Steps & Checklist
Click steps to track your progress.
- 1
Immediately disconnect the battery from the charger to prevent further overvoltage and potential damage.
- 2
Verify the charger's output voltage regulation by measuring its open-circuit voltage (if safe to do so) or output voltage with a dummy load.
- 3
Check the charger's configuration parameters to ensure the correct battery nominal voltage and appropriate charge profile are selected for the connected battery type.
Verified technical data. Last updated: March 2026
Related Faults
Source: Fronius Perfect Charging