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HPWC to NEMA 14-50

Discussion in 'Model S: Battery & Charging' started by smilepak, Aug 28, 2015.

  1. smilepak

    smilepak Member

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    Anyone connected their HPWC to a NEMA 14-50 outlet. Can you show me your wiring setup, some pictures of the connections and cables? I am interested in trying it out.

    Thx
     
  2. mknox

    mknox Well-Known Member

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    I have a NEMA 14-50 in the garage. I was thinking of buying a second UMC so I could leave one in the car, but a) the UMC has been discontinued for sale in Canada and b) the HPWC was only something like $100 more, so I bought a HPWC.

    All I did was purchase a cord set intended for an electric range at my local Home Depot. It has a NEMA 14-50 plug on one end and bare wires on the other. I installed a cable strain relief fitting into the HPWC, ran the cable inside and hooked it up. I set the DIP switches to the position for a 50 amp circuit (40 amps delivered). Mounted the UMC to the wall near my outlet and plugged it in. Works like a champ.
     
  3. Emobile

    Emobile Member

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  4. Panoz

    Panoz Member

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    Gosh, mknox, that sounds like a great situation to have when a NEMA 14-50 is available. And you can unplug the HPWC if you need the NEMA 14-50 for something else.
     
  5. smilepak

    smilepak Member

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    Thanks. Good to know they have the cable already made at Home Depot. Is it in the electrical section?
     
  6. FlasherZ

    FlasherZ Sig Model S + Sig Model X + Model 3 Resv

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    See the FAQ in my signature. It talks about it.
     
  7. smilepak

    smilepak Member

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    I wonder if they will be updating the HPWC anytime soon
     
  8. jbcarioca

    jbcarioca Active Member

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    Mine is connected directly to a 40 amp circuit breaker with a metering device inline because I live in a condominium and must pay thevAssociation for my electricity. The Tesla connector, whether HPWC or just the connector without the HPWC logic, is a much nicer choice than is any NEMA or SAE solution, IMHO. My own experience is that I really do not need a higher power because my car sits in the garage for a long time, so I have no need for faster charging at home. It's always nice to have more, but why pay for something I will never need or even want? I admit it is a bit odd to think that way when the car is seriously over powered, but...:wink:
     
  9. llavalle

    llavalle Member

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    Wow, did not know that. Why did they discontinue it?
     
  10. mknox

    mknox Well-Known Member

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    Here's an example. You can find them on Amazon or just about anywhere.

    - - - Updated - - -

    Not sure. As I say, I toyed with the idea of a second UMC but since the HPWC was only a bit more money, I decided to go that route. When I mentioned this at the Service Center when I picked up my HPWC, they said it was a good thing I'd made that decision because the UMC is no longer for sale, and they wouldn't have been able to get me one even if I wanted it.
     
  11. ecarfan

    ecarfan Well-Known Member

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    #11 ecarfan, Aug 31, 2015
    Last edited: Aug 31, 2015
    Just curious: why do you want to convert an HPWC with a Model S/X connector to one with a NEMA 14-50 connector? Then to charge the car you have plug the UMC with the 14-50 adaptor into the HPWC cable with the 14-50R?

    Do you want to do this simply to make the HPWC a more versatile power source?
    Do you mean that it is no longer possible in Canada to buy the UMC separately from the car? After all, a UMC comes with every Model S/X sold in Canada. Why wouldn't Tesla sell the UMC separately?

    p.s. Now that near-production versions of the X have been seen on the streets in California, I somehow feel compelled to write "Model S/X" instead of just "Model S" when discussing items like the UMC. [emoji3]
     
  12. mknox

    mknox Well-Known Member

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    The idea is to install a NEMA 14-50 cord set on to the HPWC so that you can simply plug it in to a pre-existing NEMA 14-50 outlet, rather than hard-wiring it in. No change to the cable that goes to the car.
     
  13. MorrisonHiker

    MorrisonHiker Beta Tester

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    I think ecarfan might've been confused because you had a typo in your original post. You mentioned adding the cable to the HPWC but then said:
    Shouldn't that be HPWC instead of UMC?
     
  14. mknox

    mknox Well-Known Member

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    Ugh! Yes, I meant HPWC!
     
  15. Cosmacelf

    Cosmacelf Active Member

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    There are rumors that a new HPWC and/or UMC will produced with the introduction of the Model X. There is also a separate rumor that the Model X will have a 60A AC charge limit.
     
  16. mknox

    mknox Well-Known Member

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    That's what I was told, and I don't really know why. I do know Tesla in Canada can still get them for warranty replacements, because I've had a couple replaced that way myself. I understand you can still get them in the US, but even the Accessories Page says for customers outside the US to contact their nearest Service Center.
     
  17. davidc18

    davidc18 Member

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    +1 - exactly what I did as well.

     
  18. m6bigdog

    m6bigdog Member

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    FWIW, the Tesla Charging Support Team will inform you that the only approved wiring method for the HPWC is permanent on a dedicated branch circuit.
    While the HPWC Installation Guide does not specifically state that a flexible power cord is not allowed, it only includes guidance for a permanent/hardwired installation.

    The HPWC is a UL listed device (UL 2594 Standard) and as such the installation must comply with the manufacture installation instruction or the UL Listing is void and the equipment is therefore not acceptable to the NEC.

    Also, the NEC restricts the length of the flexible cord to 12 inches when allowed, however for the Tesla HPWC the flexible cord is not an approved wiring method as per Tesla.
     
  19. mknox

    mknox Well-Known Member

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    I believe since it is not specifically prohibited in the installation instructions, it is still in the grey area. They don't show every conceivable permanent wired scenario either. In fact, there are weasel words in the instructions that say:

    8-31-2015 1-37-47 PM.jpg

    So by saying that, they should never be installed outdoors.

    I wonder why that doesn't apply to, say, electric ranges or electric clothes dryers?
     
  20. mobe

    mobe Member

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    Here ya go. image.jpg
     

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