Dear George,
According to my service experience, such a case is clearly an on-board charger fault - and if my memory serves me correctly, this car type is equipped with the Renault Zoe's Chameleon charger, for which I strongly do not recommend single-phase charging! From the fault phenomenon, I can also say for sure that the IGBT unit is shorted, the factory price of which at Renault is somewhere around 340 euros net. Of course, this will not cover the entire repair, since the removal, repair and testing of the on-board charger will result in a good fourteen hundred euros, depending on where you have your car repaired.
I would say that the cause of the fault is overvoltage in the absence of any evidence: the Chameleon on-board charger is one of the most sensitive chargers on the market. I have had half a dozen cases where the T1+T2 "combined" coarse protection, which electricians often recommend, was installed instead of the T3 fine protection I recommend, and this was not able to protect the life of the charger either - it clearly reduced the damage, but it still failed despite the overvoltage protection. So if you can afford the repair, for your own good, don't listen to anyone and have a T3 class protection installed in front of your charging point. Whether they will also talk you into a T1, T2 or T1+T2 in front of it is up to you; According to a small number of experts, the T3 can provide protection on its own (even in a kamikaze way, at the cost of its own life, which is still only 20-50 euros, not 1300), but the majority have been hammered into their heads by the principle of "selective protection", according to which only three together provide sufficient protection - yes, this is perfectly true for a hospital intensive care unit, where a power outage due to a stray overvoltage cannot be allowed.
Finally, if you touch the electricity meter cabinet, have the "C" class, slow-acting circuit breaker replaced with a "B" class, fast-acting circuit breaker. All eCar on-board chargers contain a soft starter, so they don't need a slow-acting circuit breaker, because they don't have a start-up current surge. However, the operation of the T3 class surge protection is based on the fact that it trips the circuit breaker in the event of too high an overvoltage, so it really doesn't matter how quickly it can do this.
Best regards,
Battery Doctor
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