11

Check Mains Voltage

Fronius · Perfect Charging

What does 11 mean?

The system indicates a need to check the incoming mains voltage. This suggests the input power supply to the battery charger may be outside its operating specifications or unstable, preventing proper operation or charging.

Common Causes

  • Input mains voltage is too low for the charger's operating range.
  • Input mains voltage is too high for the charger's operating range.
  • Instability or significant fluctuations in the mains power supply.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Measure the incoming mains voltage at the charger's input terminals using a multimeter.

  2. 2

    Compare the measured mains voltage against the nominal voltage and tolerance specifications of the device.

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Verified technical data. Last updated: March 2026

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