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14-50 outlet - will it work if the voltage is 208V instead of 240V?

Discussion in 'Model S: Battery & Charging' started by Electricfan, Feb 3, 2016.

  1. Electricfan

    Electricfan Active Member

    Joined:
    Aug 24, 2013
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    1,139
    Location:
    Houston
    I have a 14-50 outlet at home I use for my car. My boss is installing one here at the office, but the electrical service here is different than I have at home. Something to do with at home I have single phase, vs here at work we have 3-ph, so the voltage is going to be 208V and not the higher 220 or 240 (can't remember, I'll measure when I get home) I have at home.

    Will the Tesla care? I assume it will still limit itself to 40a, with my single charger, so it will just charge more slowly at the lower voltage?
     
  2. ChrisPDX

    ChrisPDX Member

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    Location:
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    That won't be a problem. You'll just charge about 20% slower then on a normal 240v 14-50. Most public J1772 stations are 208v, so the cars have be compatible.
     
  3. Cottonwood

    Cottonwood Roadster#433, Model S#S37

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    Location:
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    Almost correct. 208 Volts is actually 13.3% lower than 240 Volts, and on 208 Volts, the Tesla will charge 13% slower than on 240 Volts for the same current.

    Many commercial locations have 208/120 Volt 3-phase service, as well as many RV parks. Teslas will charge just fine, but a little slower, on 208 Volts.

    You have a great boss, BTW, if she is willing to install EV charging outlets in the workplace!
     
  4. ChrisPDX

    ChrisPDX Member

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    Admittedly, I used 200v as that's what I always seem to get at commercial sites. Then my quick head math came up with 20% instead of 16.7%. Close enough. :)
     
  5. Barry

    Barry Active Member

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    My home, a condo, is in a mixed use commercial/residential building and has 3 phase power. My daily (or nightly) charging is at 208V. At 40A, it charges at about 25 mi/hr. No problems at all.
     
  6. Fuma586

    Fuma586 Member

    Joined:
    Jan 6, 2016
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    25
    Location:
    Clinton Twp, MI
    I charge at work on 3 phase 208v. The tesla charging cord will accept 2 or 3 of the phases but prefers 3.

    The 208v I charge on is actually 191v once I start drawing from it and it charges at about 23 mph.

    Hope this helps.
     
  7. Electricfan

    Electricfan Active Member

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    Aug 24, 2013
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    1,139
    Location:
    Houston
    Yes, he's awesome - not only to install the outlet (although I am paying for it) but to pay me enough that I can own a Tesla!
     

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