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HPWC charging speed for Model X

Discussion in 'Model X: Battery & Charging' started by balefire, Dec 17, 2016.

  1. balefire

    balefire Member

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    I purchased my HPWC almost 3.5 years ago for my old Model S.
    I was able to charge my Model S at 63 mi/hr at 80amps
    Apparently I can only charge my new Model X at 72amps max.

    To 72 A or not to 72 A?

    How fast is the maximum I can charge my Model X theoretically? 51 mi/hr?
    Why can't the Model X charge at 80a?
    Tried charging at 72amps yesterday and only charged at 36 mi/hr. Why?

    What is everyone else's experience charging their MX at 72A?
     
  2. TexasEV

    TexasEV Well-Known Member

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    To answer one of your questions, the Model X can't charge at 80A because it has a single 72A charger. Your old Model S had dual chargers meaning two chargers of 40A each.
     
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  3. animorph

    animorph Member

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    And the MS goes farther per kWh than the MX, so comparing mi/hr is unfair to the chargers.

    Still, your difference seems larger than these differences would suggest.

    Also make sure you are looking at rated miles, not mile based on your last xx miles of driving. I'm not yet an owner yet, so I'm not sure which way the mi/hr is calculated.
     
  4. TexasEV

    TexasEV Well-Known Member

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    The charging speed is displayed on the screen as rated miles/hr. Nothing to do with recent driving.
     
  5. McManX

    McManX Member

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    I think mine is usually 47mph
     
  6. 2virgule5

    2virgule5 Member

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    If you look at miles per hour of charge @ 240V 72A you'll find varying values depending on the model of the car, ie a X75D will appear to charge more miles per hour than a P90D. The quantity of energy going into the battery in a given time is the same but a 75D drives more miles with it. That been said a 90D should show 46 to 47 miles per hour of charge @ 72A, a bit less for a P90D, a bit more for a 75D.

    Now there are other reasons why you saw less, like:
    - your voltage may be lower than 240V, it can fluctuate down to 210-220V
    - if its cold when you start to charge, part of the energy may go into warming up the car and the battery which is not insignificant - wait half an hour and check back it may have increased
     
  7. CmdrThor

    CmdrThor Active Member

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    Was the 36 mph number immediately after you plugged in? It takes a few minutes for the mph to ramp up. I usually get 47 mph with my 72 amp charging at ~236 V. If you are really getting 36 mph, then your voltage would have to be around 180 which sounds unlikely.
     
  8. number12

    number12 Supporting Member

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    Pretty steady at 50mph
     

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  9. CmdrThor

    CmdrThor Active Member

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    Do you have a 75D? The mph will be higher than a 90D due to the lower pack weight.
     
  10. balefire

    balefire Member

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  11. TexasEV

    TexasEV Well-Known Member

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    State of charge has no effect on AC charging, until you get to the last few percent. It only matters for supercharging.
     
  12. maratd

    maratd Member

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    > Tried charging at 72amps yesterday and only charged at 36 mi/hr. Why?

    This may be a dumb question ... but did you pay for the High Amp Charger Upgrade? Because if you didn't, then your X is software limited to 48A.
     
  13. TexasEV

    TexasEV Well-Known Member

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    What did your charging screen say (amps and volts)?
     
  14. number12

    number12 Supporting Member

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    60D... so a 75 pack
     
  15. andrewket

    andrewket Well-Known Member

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    Hardware limited. Software limited 48A was only for X's built before mid March.
     
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  16. Rocky_H

    Rocky_H Active Member

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    Thank you for continuing to get this out there. I just found someone else in another thread saying the chargers were software limited, and I had to give the link to your really great comment in another thread where you laid out all of the time periods and model types that had hardware or software differences.
     

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