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Hot outlet reducing charging speed

Discussion in 'Model 3' started by Jpjpjp, Jul 7, 2018.

  1. Jpjpjp

    Jpjpjp Member

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    Has anyone else received this message? I just had a NEMA 14-50 installed and received this message when I tried charging. Was my electrician just sloppy? If so, what could he have done or didn’t do that is causing this? Or is possibly my UMC?
     

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  2. MattMatt

    MattMatt Member

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    Heat is a sign of a poor electrical connection. For an outlet the most common culprit would be where the conductor is attached to the outlet. Not sure where you are in Los Angeles, but if your up in the valley and need a hand message me.
     
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  3. hoang51

    hoang51 Member

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    #3 hoang51, Jul 7, 2018
    Last edited: Jul 8, 2018
    Did your electrician follow Tesla's installation guide for the NEMA 14-50? Especially 6 AWG copper wiring and NEMA 14-50 industrial grade? More info here: Home Charging Installation.

    As @MattMatt pointed out above, poor wiring is a probable cause of heat build up. I would suggest @Jpjpjp to discontinue using the outlet and even shutting off the breaker to the outlet until it is inspected for signs of poor installation, as such defective installation may cause a fire.
     
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  4. boaterva

    boaterva Supporting Member

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    As a general note, this is the basic reason all our charging circuits are restricted to 80% loads. Because they are running continuously (or ‘a lot’).

    The normal circuit in your home runs ‘once in a while’ and then shuts down, these run for hours while charging and the extra ‘headroom’ of the 20% cushion allows for more heat dissipation /current space.

    Long story short, if it can’t even take the 80% load, it definitely wasn’t designed or installed correctly!
     
  5. SoCalDude

    SoCalDude Member

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    When I charge my 3 with the provided charger connected to my Nema 14-50 receptacle, the charger and cable are very warm. This makes me think that the charger itself is not very efficient. I am hoping that when the Tesla Wall Charger arrives that it will not build up the same level of heat in the charging cable.

    I have never seen that message before.
     
  6. Hammer@OR.US

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    The provided cable and the wall mount connector are not "chargers" they are merely relay boxes. The charger is inside the car.
     
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  7. SW2Fiddler

    SW2Fiddler Ell Zee One, when the twins alit.

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    Think of it as a Connector and you’ll be on the right track. The charger is in the Model 3’s battery pack in a “penthouse” assembly at the rear end. Its efficiency does not affect the temp of the connectors you can touch.

    Both the Mobile Adapter and Wall Connector are dealing with the AC as it is, not converting to DC as the charger does.

    Nerdy and specific, but true and hopefully helpful!

    And hot outlets need to be checked out ASAP.
     
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  8. dhrivnak

    dhrivnak Active Member

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    I would turn off your breaker and take out the outlet and ensure all the screws are torqued tight. A lose screw is a common issue that causes this and is easily remedied.
     
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  9. TexasEV

    TexasEV Well-Known Member

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    When I explain here that the UMC and HPWC are not “chargers” , I usually get criticized for being pedantic. Long live us pedants!
     
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  10. boaterva

    boaterva Supporting Member

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    The problem (one of them, lol) is then Tesla goes (went) and creates the Destination Charger program. Arg! (Sorry for the OT!)
     
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  11. Hammer@OR.US

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    Yes, however in this case it was very relevant not merely pedantic since the post referenced "efficiency" differance of chargers which makes no sense given they are just passthrough devices.
     
  12. TexasEV

    TexasEV Well-Known Member

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    #12 TexasEV, Jul 8, 2018
    Last edited: Jul 8, 2018
    No, it’s Destination Charging program, not Destination Charger program.
     
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  13. boaterva

    boaterva Supporting Member

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    You are correct! Too bad everyone still calls them Destination Chargers, however, though... What do we call the ‘HPWC/TC’s that we find when we go somewhere to ‘Destination Charge’. :D


    Destination Charging | Tesla
     
  14. Twiglett

    Twiglett Single pedal driver

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    It’s a lost cause, everyone (except the previously mentioned pendants) calls them chargers.
    Please nobody mention EVSE or we’ll really get off topic :D
     
  15. boaterva

    boaterva Supporting Member

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    Yeah, we know. It’s on a par with 110 and 220 vs 120 and 240. :eek:
     
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  16. Jpjpjp

    Jpjpjp Member

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    Well the electrician used a 8 AWG wire. He insists it’s fine although the agreed to come check out why it’s getting overheated.

    Anything I can say to win my argument that it’s NOT fine over his professional optimism other than point to my issue or the Tesla instructions?
     
  17. vinnie97

    vinnie97 #WalkAway

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    The photo above ought to be proof enough that something isn't copacetic (though I guess he could unprofessionally blame the car).
     
  18. Ejl80

    Ejl80 Supporting Member

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    Is the wire in a conduit? What size is the conduit? Or is it NM cable? 6 AWG is the way to go either way. I prefer safety when working with electricity. Ampacity Charts
     
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  19. Ejl80

    Ejl80 Supporting Member

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    The wires get warm because all electric wire resists the movement of electricity to a point. That’s why we use bigger wires for higher currents. You’ll notice the cord getting warm on any device pulling a high current for the gauge of wire.


    The charger is in the car as others have said... the UMC or wall connector are basically fancy extension cords.
     
  20. NickFie

    NickFie Member

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    I would insist the electrician replace with 6-gauge COPPER. It seems 8-gauge is fine for 30 Amp but not 50 Amp. Cover the additional material cost. Electrician can use the rejected 8-gauge wire in their next dryer outlet install.

    Electrician may not have dealt with Tesla before. Few other EVs on the road can pull 40 Amps to recharge at all, much less for hours.
     
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