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MX battery consumption question.

Discussion in 'Model X' started by Jillmark99, Dec 29, 2019.

  1. Jillmark99

    Jillmark99 Member

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    Ontario
    I have never felt I get the proper charge or mileage out of my model X. I am hoping someone with more Tesla battery knowledge than me can help clarify if what my MX gets is correct or if I need to get the battery looked at. I performed a little test and tried to get as much info as possible to yield some accurate results. I would appreciate feedback on the below.


    2016 MX 75D with approx 85,000kms

    Charged with HPWC to 100% - 356kms (this seams low to me).

    Car sat overnight in a warm 11 degree C garage. Car was still plugged into the HPWC.

    I warmed up the car for about 15 minutes prior to departure using the app.

    Left in morning with battery at 351kms.

    Temp is 2 degrees C outside.

    Drove 109.3kms, battery is now at 197kms. Approx 3/4 of the trip was county roads and 1/4 of the trip was city driving. Very little traffic.

    Driving was in the dark with cabin at 23 degrees C.

    Both front heated seats on for 1/2 the trip.

    The car averaged 249wh/km and consumed 27.3kwh for the drive. This is based on the info on the MCU screen.

    I did not use AP or cruise for this trip.

    I have 20” wheels.

    Is this normal? Car used 154kms for this trip?

    2 weeks ago when it was really cold outside, approx -15 degrees C, the car used the ENTIRE battery for the exact same trip.

    I appreciate your help.
     
  2. ShawnA

    ShawnA Supporting Member

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    Hi Jillmark99,

    Have you owned the car since 2016?
    What was the EPA/sticker mileage when you bought it?

    If my math is correct 249wh/km would be about 400wh/m...
    My lifetime average on a 2018 X100D also on 20" tires is 375wh/m.

    Cold as you know severely limits battery output/mileage...
    Set heaters on... Set at 1, 2, or 3 bars???

    It does not look too far off to me...
    Some people here plan/expect 50% of their "normal" mileage in the cold.

    Shawn
     
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  3. scottf200

    scottf200 Active Member

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    Chicagoland ModelX S603
    You left out one big factor ... how fast were you driving? I know you did country and city.
    You can see below that the speed matters.

    1) 2C/35.6F which is fairly cold (battery temp and lubrications (any moving part in drivetain))
    and you were heating the cabin to 23C/73.4F which is somewhat warm.
    -- I'd use your seat heaters 100% of the time and lower your cabin temp a little.
    2) I wonder if your tire pressure is good. I run my Xs at 45 psi cold.
    3) Have you used abetterrouteplanner.com tool/website to map out your route? You can put in your vehicle X 75D and at least 5-7% battery degradation. Also put in the 'Road Conditions' and outside temps.
    -- clicking on the resulting route line also brings up elevation. Makes a big diff if you are going even a little uphill.

    [​IMG]

    Example of a 348 km drive in 2C for a 75D

    [​IMG]

    [​IMG]
     
  4. Jillmark99

    Jillmark99 Member

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    The drive was fairly flat. Not a lot of hills around here.
    I was driving approx 110kph outside the city and about 60kph within city limits.
    Tire pressure is at 45psi.
     
  5. scottf200

    scottf200 Active Member

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    Try abetterrouteplanner.com with your temperatures and accurate to/from locations to see it it comes lose. Try the two temperatures 2C and -15C.
    P.S. You are welcome for all the details above. Geez.
     
  6. Jillmark99

    Jillmark99 Member

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    I have not owned it since new. I purchased it second hand but I’ve owned it for quite a while. Seat heaters are usually on high.
     
  7. Jillmark99

    Jillmark99 Member

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    My apologies. Thank you.
     
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  8. ewoodrick

    ewoodrick Well-Known Member

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  9. ewoodrick

    ewoodrick Well-Known Member

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    Winter is NEVER the time to attempt to match the car's rating. At 2C, I suspect that you will have over 30% degradation in range. That's just the fundamentals of pretty much any battery.

    To see if you are making the range, in the summer with 23C temps, make a highway run at 60 mph from 100% to 10%. That should allow you to get a real estimate of the battery's range.

    To get MUCH better understanding, watch the Energy graphs for a real time estimate of your consumption and range.
     
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  10. scottf200

    scottf200 Active Member

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    A comparative example of how my X is affected by temperatures. This is from TeslaFI.COM built in table it made for my car but I customized in Google sheets for C and km

    [​IMG]
     
  11. Jillmark99

    Jillmark99 Member

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    Thanks for taking the time to complete the above comparative.
     
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  12. scottf200

    scottf200 Active Member

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    Your'e welcome. I was curious myself as I've had some close calls in the winter.

    I actually thought the percentages would be a LOT worse the colder it got.

    Have you tried A Better Routeplanner ? It has a lot of miles of testing behind it and you can play with temperatures.
     
  13. Jillmark99

    Jillmark99 Member

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    #13 Jillmark99, Dec 29, 2019
    Last edited: Dec 29, 2019
    No I have not tried it. The route in my OP is travelled often by myself and my wife. I might sometime. Was just curious if the battery consumption seamed normal. When I drive my S I don’t use near as much battery.
    I know the X chews up the electricity more than the S but my X just seams excessive. Maybe it’s correct, just seams high consumption to me.
    Thanks for the replies.
     
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