What does a EV charging point actually do? - Wiring and the Regulations BS 7671 - IET EngX - IET EngX

What does a EV charging point actually do?

I have bought a 2nd hand Nissan leaf and have been happily charging it slowly from a 13A socket (fed by solar panels) for 6 months using the "granny lead" that comes with the car.

Yesterday, when I turned it on, the READY and CHARGE light flashed about once per second, as did the lights on the dashboard, and there was a click each time from the unit. The manual does not list this combination as indicative of anything.

This lead me to wonder what the "charging unit" actually does, It lists its input and output as 250V ac so it clearly is not a transformer/ rectifier. If it is a protective relay measuring neutral earth voltage, then maybe the ON / OFF is caused by something happening to the voltage in the house?

I have not found any information on the internet as to what is inside these units.

  • Thank you for all the helpful replies.

    Yesterday my "granny lead" was cycling on and off at about one cycle per second, with the Power and Supply lights going on and off and the Fault light staying off. Today, it is behaving itself.

    I was wondering if it could be detecting a high neutral - earth voltage at my house and turning off, which reduced the load and the voltage and turned back on again?

    I can't think of anything else that would cause it to cycle in this way, but I am not convinced by my own idea either.

  • well if you suspect a fault, you could monitor the earth neutral voltage. and then plug in a kettle or something. Don't overlook simple under voltage drop out either.

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