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Inaccurate Internal Energy Metering
Charger’s internal energy metering is clearly inaccurate compared to an external meter (e.g., large kWh discrepancy).
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Drifted current transformer calibration, Firmware bug affecting metering, Incorrect phase configuration, Faulty metering IC on control board
How to Fix / Troubleshooting
Note: This affects billing/monitoring but not basic charging safety.
- Verify configuration: Ensure the charger is configured for the correct number of phases and supply type in the app.
- Compare over time: Use a calibrated external meter to log energy over several full charges and quantify the error.
- Update firmware: Install the latest firmware, as metering corrections are sometimes included.
- Factory reset and recalibrate: If supported, perform a factory reset and any available calibration procedure.
- Replace control board: If large errors persist, the metering IC or CTs may be faulty; replace the control board or CT assembly.
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Repair Difficulty
Medium
3/5
Required Part
Internal Metering Circuit / CT Assembly
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