Mini
Metering / Current Measurement Error
Mini EV Home Charger energy readings (kWh) seem inaccurate or inconsistent with utility meter
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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
Calibration drift in internal metering IC, Faulty current sensor, Firmware bug in energy calculation, Incorrect phase configuration
How to Fix / Troubleshooting
Note: Minor differences are normal; large discrepancies indicate a fault.
- Compare over time: Measure energy over several full charging sessions and compare to vehicle-reported energy and utility meter.
- Check configuration: Ensure the charger is configured for the correct supply type (single vs three-phase) and current rating.
- Firmware update: Install latest firmware to correct metering issues.
- Technician calibration: A technician can use a calibrated meter to compare readings and, if supported, recalibrate or replace the metering section of the main PCB.
For billing-critical applications, use an external certified meter if internal metering cannot be trusted.
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Repair Difficulty
Medium
3/5
Required Part
Mini EV Charger Current Sensor / Metering IC
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