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Battery Overvoltage in I2 Phase

Fronius · Perfect Charging

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The battery voltage exceeded its safe limit while the charger was operating in the I2 (secondary constant current) charging phase. This indicates a problem with the charger's voltage regulation or an issue with the battery itself during this critical charging stage.

Häufige Ursachen

  • A malfunction in the charger's voltage regulation circuit specifically during the I2 phase, allowing the voltage to rise too high.
  • Battery cells becoming overcharged or experiencing premature voltage rise due to internal imbalances or defects.
  • An incorrectly configured I2 phase voltage limit in the charger's settings, set higher than the battery's safe maximum.

Reparaturschritte & Checkliste

Klicken Sie auf Schritte, um Ihren Fortschritt zu verfolgen.

  1. 1

    Disconnect the battery and measure its terminal voltage directly.

  2. 2

    Verify that the charger's I2 phase voltage limit setting (parameter, if available) accurately matches the battery's specified maximum charging voltage.

  3. 3

    Monitor the charger's output voltage and current during the I2 phase, if safely possible with diagnostic equipment, to observe regulation behavior.

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Verifizierte technische Daten. Zuletzt aktualisiert: March 2026

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