Vestel Incorrect External CT Measurement

Vestel EV charger’s load management with external CTs appears inaccurate; charging current is reduced even when house load is low.

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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

CTs installed on wrong conductors, CT polarity reversed, Incorrect CT ratio configured in charger, Loose CT secondary connections

How to Fix / Troubleshooting

Safety first: CTs are installed on live mains; only qualified electricians should adjust them. Isolate circuits where possible.

  • 1. Verify CT placement: Confirm that CTs are clamped around the correct phase conductors feeding the property, not individual branch circuits.
  • 2. Check orientation: Ensure the arrow on each CT points in the direction specified by Vestel (usually towards the load).
  • 3. Confirm CT ratio: In the charger configuration, set the CT ratio to match the installed CTs (e.g., 100 A:1 A).
  • 4. Tighten CT terminals: Ensure CT secondary wires are firmly connected at the charger’s CT input terminals.
  • 5. Test readings: Compare the charger’s reported house load with a clamp meter measurement. Adjust configuration or replace CTs if discrepancies remain.
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Repair Difficulty

Hard 4/5

Required Part

External CT Sensors
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