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40 amp Charging 2013 p85 25 mph normal?

Discussion in 'Model S: Battery & Charging' started by GadgetGeek407, Dec 7, 2016.

  1. GadgetGeek407

    GadgetGeek407 Member

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    I read it should charge at 29 mph but is doing between 24-25 and going between 39--40 amp ...is this normal
     
  2. MikeC

    MikeC Active Member

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    What's the voltage? The rate should be 29 at 240V/40A.
     
  3. tga

    tga Supporting Member

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    I'm going to guess you're charging on a commercial 3-phase system (208V). 25/29 * 240V = 207V.

    24-25mph @ 208V is pretty reasonable.
     
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  4. Rocky_H

    Rocky_H Active Member

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    How fast miles go into the battery is based on power (watts or kilowatts). That is voltage times current, so either of those being lower will make the charging rate be lower. Residential electricity usually has 120V and 240V, but commercial properties usually have 120V and 208V. 25 mph is about what I have seen from the 208V systems.
     
  5. kort677

    kort677 Active Member

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    25 MPH is on the lower side of normal, I usually get 28-29 MPH
     
  6. GadgetGeek407

    GadgetGeek407 Member

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    I do have this at my office warehouse so I'm assuming based on the comments I've seen is cause it's not residential?
     
  7. brkaus

    brkaus Active Member

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    You need to look at the voltage that is displayed when charging. If around 208, then yes.
     
  8. GadgetGeek407

    GadgetGeek407 Member

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    Ill check tomorrow, if thats the case, is there a way to speed it up or not really?
     
  9. tga

    tga Supporting Member

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    Short of installing a higher amperage circuit/upgraded charging station, no.
     
  10. auger

    auger Member

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    Is another 4 mph important?
     
  11. scaesare

    scaesare Well-Known Member

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    This.

    I have 208 in the parking garage here at work, and I get ~24-25 MPH of charge.
     
  12. ecarfan

    ecarfan Well-Known Member

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    As others have noted, check to see the voltage the car displays while charging. Is there anyone at your work location (landlord?) who can tell you the voltage/amps of the outlet you are using to charge?

    You can't readily change the voltage the outlet provides but if you can verify the voltage at least you have an explanation for the slightly lower charge rate than what you were expecting it to be.
     
  13. ColdRauv

    ColdRauv Member

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    If you must, you could look into installing a 1.5 kVa buck-boost autotransformer between the panel and the receptacle to raise the output voltage from 208 VAC to 240 VAC. You would need to verify the existing conductors and circuit breaker first (probably OK, though). Not worth the time and money spent for just a few more MPH charging speed.
     

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