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Discussion Starter · #1 ·
I am writing to share a problem I've been having with my charging point. Recently, the charger has been turning itself off after a couple of minutes of charging. I have an old unit installed back in 2017, so I'm not sure if this is a common issue with older charging units or if there is something specific to my situation.
I am wondering if any of you have experienced a similar problem and if there are any troubleshooting steps I can take before calling an electrician. I have checked to make sure the connections are secure, but I'm not sure what else to try.
I appreciate any advice or tips you may have! Thank you in advance for your help.
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Hi, you could have a loose connection on one of the terminals in the Mini CU or in the EVSE itself.
Have you got someone you know with an EV that can test it on a different car?
 

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The RCD probably needs replacing. It should be a 40a not 32a to prevent nuisance tripping. If you have just changed car the new car could pull more power than the last so wasn't an issue before. Could also just be the RCD is old and isn't happy at the high current anymore. I doubt you are pulling more than the 32a unless the car has a major fault
 

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The RCD probably needs replacing. It should be a 40a not 32a to prevent nuisance tripping. If you have just changed car the new car could pull more power than the last so wasn't an issue before. Could also just be the RCD is old and isn't happy at the high current anymore. I doubt you are pulling more than the 32a unless the car has a major fault. Could also be an earth fault. Any moisture inside the charge unit?
 

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Discussion Starter · #7 ·
Didn't notice any moisture
We had several EV from the moment we had a charging point installed. The current MG4 did over 5k miles charging once a week and phev charging daily
 

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I had a 32A breaker in my domestic CU, lasted 10 mins on my first ever 7 kW charge before it warmed up a bit and derated the trip current to 31.5A . Quite possible you have the same problem.
 

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The RCD probably needs replacing. It should be a 40a not 32a to prevent nuisance tripping. If you have just changed car the new car could pull more power than the last so wasn't an issue before. Could also just be the RCD is old and isn't happy at the high current anymore. I doubt you are pulling more than the 32a unless the car has a major fault
My 32A Rolec has a 40A MCB/RCD from new, and I suspect a lot of charge points are like this...while a 32A should in theory be enough for a continuous 32A it is likely to suffer nuisance trips on some cars especially as the MCB ages.

Of course the wiring to the charge point and supply supplying it should be adequate for 40A if it was changed to a 40A MCB/RCD even though the car is only ever going to draw 32A, as one of the reasons for the MCB is to protect the house wiring leading to the charge point from overload in the case of a fault.
 

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I had the same charge point - it burnt itself out - there was melting apparent on the right hand side of the plastic case where the internal arcing had started getting really really hot. They wouldn't honour any warranty because I'd had it moved. Make sure you isolate it, but get the cover off quick and check the internals - it will be very very obvious if it's doing the same thing.
 
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