Rolec Reduced Output Current / Derating

Charging speed is significantly lower than expected; vehicle shows reduced kW even though charger is rated higher.

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Possible Causes

Dynamic load management limiting current due to house load, Incorrect maximum current configured in Rolec settings, Overtemperature derating by control PCB, Vehicle limiting current due to its own battery conditions

How to Fix / Troubleshooting

Safety first: Lower charging current is not a safety issue but may indicate configuration or thermal problems.

  • Check app settings: In the Rolec app, verify the maximum current limit and any eco or low‑power modes. Increase within safe limits if appropriate.
  • Review load management: If a CT clamp is installed, high household consumption may cause the charger to reduce current. Test when other large loads are off.
  • Monitor temperature: If the charger is hot, it may be derating to protect itself. Improve ventilation or shading and see if current increases.
  • Vehicle limitations: Some EVs limit current at high or low state of charge or in cold conditions. Compare with the vehicle’s documentation.
  • If derating persists without cause: The current sensing or thermal management on the control PCB may be mis‑reading and could require calibration or replacement.
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Repair Difficulty

Easy 2/5

Required Part

CT clamp sensor
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