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Consumer Reports - Winter chills limit range of the Tesla Model S electric car

Discussion in 'Model S: Driving Dynamics' started by CapitalistOppressor, Feb 15, 2013.

  1. CapitalistOppressor

    CapitalistOppressor Active Member

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    #1 CapitalistOppressor, Feb 15, 2013
    Last edited: Feb 15, 2013
  2. Jason S

    Jason S Model S Sig Perf (P85)

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    Fair evaluation. Stuff we already know from sharing our experiences here.

    Thanks for sharing!
     
  3. doug

    doug Administrator / Head Moderator

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    Something I've read others say here:
     
  4. ElSupreme

    ElSupreme Model S 03182

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    I was a little disappointed that they said the car only did 17X miles when the EPA says 265 at the end of the article. They didn't fully charge the battery and still got 17X miles.
     
  5. doug

    doug Administrator / Head Moderator

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    I suppose they could have been clearer by stating the 265 EPA range is based on a "range charge" and they were doing a standard charge. But I think there was enough info in the article. You could perhaps add that clarification in the comments.
     
  6. greencharge

    greencharge Member

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    What a timing, good write up consumer reports
     
  7. Doug_G

    Doug_G Lead Moderator

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    Yes they are confused about the 265, since that is for Range mode charging
     
  8. alexkiritz

    alexkiritz Member

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    Jesus ****ing Christ. This guy is the Senior Auto Test Engineer and he doesn't even understand the basic physics involved in cars. A lack of regenerative breaking isn't what reduces highway range. The substantially higher aerodynamic drag, which increases as a square of speed, is what decreases highway range.
     
  9. K Hall

    K Hall Member

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    Fair and balanced reporting.. refreshing.
     
  10. strider

    strider Active Member

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    Good stuff. I commented on the standard vs range thing.
     
  11. vfx

    vfx Well-Known Member

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    Someone should also pass-on Alex's comment above.
    with a mention of the math in dramatic drag increase above 50.
     
  12. brianman

    brianman Burrito Founder

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    Quie directly, this article is another +1 for bringing back Projected Range.
    Please, George, bring it back.
     
  13. widodh

    widodh Model S R231 EU

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    Ack!

    How do people keep thinking that? Regen and accelerate again gains you range? Like energy magically goes into your car?
     
  14. Norbert

    Norbert TSLA will win

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    #14 Norbert, Feb 16, 2013
    Last edited: Feb 16, 2013
    Yes, because it warms the battery.

    (EDIT: This was a joke. Sorry.)
     
  15. Yggdrasill

    Yggdrasill Active Member

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    #15 Yggdrasill, Feb 16, 2013
    Last edited: Feb 16, 2013
    This test isn't too bad.

    It states that around 20 rated miles were lost on the trip from the test track (due to driving at more than 55 mph for extended periods and using the heat, no doubt), and one can assume the return trip also lost 20 rated miles. That means the trip consumed around 216 rated miles, so with a remainder of 3 miles the overnight storage consumed the remaining 21 rated miles, or around 6.4 kWh. It will be interesting to see how much of that can be eliminated with an improved sleep mode.

    Update: Oops, the rated range remainder was approximately -3 on the first trip, not +3 miles. That means the overnight storage consumed 27 rated miles/8.2 kWh.
     
  16. montgom626

    montgom626 Active Member

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    Thanks for the post
     
  17. stevezzzz

    stevezzzz R;SigS;P85D;SigX

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    I tried to register on Consumer News so I could post the following, but the confirmation email never got through to my inbox. I went through the process twice and tried two different email addresses: no dice. So if someone who has registered successfully wants to post my comments (or your version of them), feel free...

    "Those of us who have been driving a Model S through the winter (I live in Colorado) applaud you for ‘telling it like it is’ without undue drama. Winter driving takes a toll on range for all vehicles, a toll that we often overlook when driving gas-powered cars with their imprecise, analog fuel gauges (and with a gas station on every corner).

    A couple of observations: almost all of the loss of range at highway speeds is due to increased aerodynamic resistance, which increases as the square of velocity. Regenerative braking has nothing to do with it, as you implied in the article; in fact, hypermilers go out of their way to avoid regenerative braking because all regen can do is recapture a portion of the car’s kinetic energy, energy that was expended from the battery to get up to speed in the first place. Regen braking is a good thing, because otherwise you’d be throwing away all that energy in the form of heat generated by using the normal friction brakes, instead of putting some of it back in the battery pack; but it’s no perpetual motion machine."
     
  18. Jeff Miller

    Jeff Miller Member

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    Yes, pretty bad. And because the drag increases as speed squared, the power needed to overcome the drag increases as speed cubed. Doubling your speed increases the energy (per unit time) needed to overcome drag by a factor of eight.
     
  19. vfx

    vfx Well-Known Member

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    These are good!


    I also tried to sign up but apparently am not worthy.

    I would combine these two.

    Jeff Miller

    And throw in the word "coast" or "coasting" in there.
     
  20. neroden

    neroden Happy Model S Owner

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    Well-written, thoughtful article. thanks for the links.
     

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