34

Ah Exceeded

Fronius · Perfect Charging

What does 34 mean?

The total Ampere-hours (Ah) delivered to the battery during charging has exceeded a predefined limit. This is typically a safety mechanism intended to prevent overcharging based on the expected or configured battery capacity, indicating a mismatch or a faulty measurement.

Common Causes

  • The actual capacity of the connected battery is significantly lower than expected or configured in the charger's settings.
  • An incorrect Ah limit parameter has been set in the charger, allowing it to deliver more charge than safe for the battery.
  • A malfunction in the charger's current integration or Ah measurement circuit, leading to inaccurate accumulation of delivered charge.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Verify the actual rated capacity of the connected battery against its nameplate or specifications.

  2. 2

    Check the charger's Ah limit parameter and adjust it to accurately match the battery's rated capacity if necessary.

  3. 3

    Perform a diagnostic check on the charger's current measurement and Ah accumulation function to ensure accuracy.

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Verified technical data. Last updated: March 2026

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