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Voltage Sag / Internal Power Instability Under Load
Charger’s LEDs or display flicker or reset when a vehicle is plugged in or charging current increases.
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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
Undersized or long supply cable causing voltage drop, Loose supply terminals, Weak auxiliary power supply, Overloaded upstream circuit
How to Fix / Troubleshooting
Safety: Avoid repeated resets under load; investigate the cause.
- Measure voltage under load: Start a charge and measure supply voltage at the charger. Significant drop compared to no-load indicates wiring or supply issues.
- Check cable size and length: Upgrade to a larger cross-section cable if voltage drop exceeds recommended limits.
- Tighten terminals: With power off, re-torque all supply terminals in the charger and distribution board.
- Check upstream loading: Ensure the circuit feeding the charger is not shared with large loads (e.g., heaters) that cause sags. Move the charger to a dedicated circuit if necessary.
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Repair Difficulty
Medium
3/5
Required Part
Main Supply Cable / Auxiliary Power Supply
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