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Wall Connector Benefits (if any) over Std NEMA 14-50

Discussion in 'Charging Standards and Infrastructure' started by James Anders, Jun 11, 2015.

  1. James Anders

    James Anders Member

    Mar 13, 2014
    Southampton, PA
    I apologize in advance if this has been already discussed ad-nauseum.

    So, what is the advantage (if any) of the Tesla Wall Connector over the standard mobile connector plugging into my NEMA 14-50 outlet 240V?

  2. DavidB

    DavidB Aug 2013 S85

    Jul 8, 2013
    Maryland, USA
    Fewer connections that could become a fire hazard.
  3. Father Bill

    Father Bill Member

    Apr 30, 2015
    Brighton, IL
    the HPWC also gives the optiom for 80 amp charging. if you have dual chargers you can charge twice as fast.
  4. Zarwin

    Zarwin Member

    May 12, 2014
    Hillsborough, NC
    For those that like to leave the mobile connector in the car, the options are buying a second mobile connector for $650 and using with a NEMA 14-50 or buying the HPWC for $750 and having it installed. If someone already had a NEMA 14-50, they would probably buy a second mobile connector, but if not, perhaps the HPWC is a better option.
  5. NOLA_Mike

    NOLA_Mike Active Member

    May 11, 2013
    Hammond, LA
    5' longer cable on the HPWC (25') versus the UMC (20').
  6. scaesare

    scaesare Active Member

    Mar 14, 2013
    In my opinion:

    • Longer cable
    • Permanent/hard-mounted installation
    • Capable of greater power delivery
    • Better cable management
    • Looks cooler :wink:

    The cable that comes with the car is called the Universal Mobile Connector for a reason... it's designed such that it can be easily moved about and taken with you for on-the road charging. I, for one, never want to be without the ability to charge on the road, hence I always want a UMC in the car.

    For me, that would mean having to unplug it, coil it up and stow in the trunk, uncoil at home to pug back in to wall and then car, etc... every day. A lot of work, and I suspect the wear and tear will show itself at some point.

    While there's nothing that prevents you from buying a second UMC and leaving it permanently plugged in at home, I find that the there are some less-optimal things about that: the plug head is rather long, and I don't care for the stress that puts on the secondary pins of the head. And I don't car for the unsupported weight of the EVSE module dangling from the plug.

    Some folks have come up for work-arounds for this, but quite frankly, the HPWC is now only a bit more than a second UMC, and has the advantages outlined above... which makes it a bit of a no-brainer.
  7. SW2Fiddler

    SW2Fiddler Bannd Member

    Mar 19, 2014
    Houston TX
    I am so glad I got and installed the HPWC. It's only running 16 Amps more than the 14-50 (70A breaker), but now, parking nose-first is an option!
    (Having options ROCKS)
  8. Rocky_H

    Rocky_H Member

    Feb 19, 2015
    Boise, ID
    That depends on each person's lifestyle and where and how much they drive. I leave my mobile connector hanging on the wall in my garage, because I don't ever come close to using my full range in a day's driving, so I never have to charge anywhere away from home. I only put the cable in the car when I am going out of town on a trip, and that is maybe three times a year.
  9. Robert.Boston

    Robert.Boston Model S VIN P01536

    Oct 7, 2011
    Portland, Maine, USA
    The downside of a HPWC vs. a NEMA 14-50 is that only Teslas can charge at an HPWC. A 14-50 lets other EVs borrow the plug, provided they have an appropriate adapter.
  10. m6bigdog

    m6bigdog Member

    Mar 29, 2015
    San Ramon, CA
    Hands down the #1 reason to install the HPWC as all other reasons including cost are irrelevant.

    A hardwired device manages the branch circuit connection/splices internal to the electrical enclosures.

    The UMC has unenclosed connections at the receptacle and adapter and both are subject to usage fatigue that will not be contained when the contact failure occurs.

    The HPWC is a 80 amp rated permanently installed device and the UMC is 40 amps mobile cord & plug device; therefore, the HPWC would be significantly more robust when used at the same charging current (1/2 the HPWC rated current).

    The HPWC is UL Listed (UMC is not); that means the HPWC is designed to the UL standard (safety standard for insurance Co.) for the EVSE and if anything should ever go wrong within the HPWC that causes a hazard/fire a follow-up investigation by UL will most likely be performed.

    Also, since the Tesla is most often charged at home daily, during the night - unattended - while I sleep, I want the most robust charging system available to protect my garage, Tesla, home and life.

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