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Charging woes

Discussion in 'The UK and Ireland' started by BCrider, Sep 22, 2019.

  1. BCrider

    BCrider Member

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    Aug 23, 2019
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    Location:
    Solihull
    Off to deepest Wales next week so thought I would test my mobile charging cable - well, has done nothing but blow my house RCD fuses at the box - thought it was possibly the extension lead so plugged direct to house socket - same result!

    then tried the granny cable for my wife's i3 - success and normal overnight charge successful.

    Back today and plugged in to same i3 cable - no charge received and charging fault showing on i3 cable box.

    Have plugged into our normal wall charger and charging successfully

    So question is, am I doing something wrong? Do I need to adjust anything in the car? Has anyone else had problems, or do I have a faulty cable?
    Any comments welcome!
     
  2. NorfolkMustard

    NorfolkMustard Active Member

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    M3P w/FSD
    Is it the RCD, or the MCB?

    RCD suggests a fault, MCB suggests over current. Try reducing the amps on the charging screen in the car
     
    • Helpful x 1
  3. BCrider

    BCrider Member

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    I am a complete novice on electrics so forgive my naivety - The bit that "trips" is the RCD main fuse in the main fuse board for the house. I am not sure what a "MCB2 is?
     
  4. Terry_B58

    Terry_B58 Member

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    The MCB (miniature circuit breaker) is the single pole 'switch' for an individual circuit. The RCD residual current device) is normally double pole (2 switches stuck together) and usually red.

    The MCB is for overcurrent protection, ie drawing more current than normal (6A for lighting etc), the RCD checks for earth leakage. If it is the RCD that is tripping, it is likely that there is a fault somewhere that needs checking.
     
    • Helpful x 1
  5. NorfolkMustard

    NorfolkMustard Active Member

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    #5 NorfolkMustard, Sep 22, 2019
    Last edited: Sep 22, 2019
    If the RCD trips then the whole, or half of, the house will go dark

    if it’s the MCB then only the circuit that feeds the plug sockets you’re using will go dark/blow. What’s the label on the switch you had to reactivate in the fuse board. Does it say something like “sockets downstairs”?

    in the Tesla charging screen, reduce the amps to 5, and try again
     
    • Helpful x 1
  6. BCrider

    BCrider Member

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    Thanks guys
    Definitely the RCD not MCB. Will try reducing the amps as suggested tomorrow - cheers
     
    • Like x 1
  7. NewbieT

    NewbieT Member

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    If the RCD is tripping there is a fault! Try the UMC cable at someone else’s house (who has RCD’s). If it trips you have a problem with the UMC, if it doesn’t you need an electrician at home to do some testing. Could be a fault, a faulty RCD, anything.
     
    • Like x 2
  8. WannabeOwner

    WannabeOwner Well-Known Member

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    Location:
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    I would dial the AMPs down on the Dashboard (I think 5 AMPs is the minimum) and see if that works.

    Then I would try at the neighbours to narrow it down to Car or House. If their house the same (particularly if built / rewired at the at same time) I'd try elsewhere - e.g. some more modern wiring at friends / family.

    I've had a problem at one house we stayed and that was at all sockets I tried (not just a "dodgy garage circuit"), but it was fine at their neighbours ... downside is that pointed to the wiring being faulty at that house which may well be expensive for the house holder :(
     
    • Like x 1
  9. WannabeOwner

    WannabeOwner Well-Known Member

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    (In case it seems a bit out of place, my post was moved here from a duplicate thread by moderator)
     
  10. ianto999

    ianto999 Member

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    Sep 8, 2019
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    Location:
    scotland
    I've got similar RCD problems with new (2 weeks old..) M3.

    I'm waiting on Zappi installation, so I'm hoping this may not be a long term problem, but I'd like to know what's going on! Apologies if I'm not using the correct electrical terminology.

    I've had a Nissan leaf which has charged via 10A 3 pin ESVE or a specific Rolec 3KW J1772 (Type1) - both in the garage - for the last 9 years with no problems.

    It's a 10 year old house/charging via garage, which has it's own 'box' for circuits etc. The Rolec installation has some earthing next to driveway (although I can't remember details).

    I've not had any problems charging M3 away from house on SC/CCS or 7Kw or 22Kw type 2 chargers.

    I've been using Rolec with a type 1/Type 2 adaptor as the main way to charge at home. This seems to generally work ok. It's limted to the rolec 3Kw.

    However, I've had the RCD trip overnight a few times (even when 80% has been reached, although it might have been topping up for sentry mode after this? - ). I don't know exactly what time the RCD tripped, but the car seems to have charged to 80% ok, from 1Am, so it seems a few hours after this.

    As I was using a Type 1 to type 2 adaptor, so I wondered if this might be the problems.

    However, today I tried UMC for the first time via the garage 3 pin (no extension etc), and it tripped RCD immediately. When I plugged it in, but with a schedule set for the future, it did not 'trip' the RCD

    Most of the time it charges fine using the rolec J1772Type1/Type 2 adaptor at 3-4Kw, although it did trip the RCD once today, just after the UMC had.

    When I look at the main board, one of the switches (breakers?) has also tripped (the one for 'upstairs sockets') when I turn RCD back on, but the garage one never 'trips'.

    I've got so many variations here I'm a bit confuddled. The only constant common participants are the M3 and my house.

    Any suggestions welcome!

    Thanks
    Ian
     

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