24
Battery Too Hot (External Sensor)
Fronius · Perfect Charging
What does 24 mean?
The external temperature sensor indicates that the battery temperature is excessively high. This is a critical safety condition that requires immediate attention to prevent thermal runaway, battery degradation, or potential hazards such as fire.
Common Causes
- High ambient temperature around the battery, leading to increased overall temperature.
- Excessive charging current applied to the battery, generating internal heat faster than it can dissipate.
- Malfunction of the battery's internal cooling system (if equipped) or an issue with the external temperature sensor mounting.
Repair Steps & Checklist
Click steps to track your progress.
- 1
Verify the ambient temperature surrounding the battery and ensure adequate ventilation.
- 2
Reduce the charging current, if adjustable, or temporarily pause the charging process to allow the battery to cool down.
- 3
Ensure the external temperature sensor is properly attached to the battery surface at the recommended location for accurate temperature measurement.
Verified technical data. Last updated: March 2026
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Source: Fronius Perfect Charging