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Hot Weather

Discussion in 'Model S' started by iknowdoyou, Mar 31, 2009.

  1. iknowdoyou

    iknowdoyou Member

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    Hi folks,

    In doing what research I could, I noticed that Tesla has a spot on their FAQ about how the battery systems handle cold weather. What I'm curious about, however, is how their system handles being in extreme heat.

    The issue is that my wife and I are planning on moving our family from Los Angeles to Scottsdale, AZ sometime in 2010, and I'm concerned that the summer heat of Arizona wouldn't be a good thing for the power system.

    I called the Tesla store in Los Angeles and talked with one of the sales folks who said that it wouldn't be a problem, as the cabin cooling system also is in charge of cooling the battery cage, with the only side effect being a slightly lower available distance per charge (because the A/C is working so hard), but I'm not sure if that's the truth truth, or salesman truth.

    Does anyone have insight into how the Roadster handles high temperatures?

    Ryan
     
  2. TEG

    TEG TMC Moderator

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    I think average higher temperatures are known to be not good for the batteries, but I think it is true that the Roadster cooling system works to keep the pack in a "happier place". The net result is probably that you use a little extra energy to keep the cooling system working.
     
  3. EVnut

    EVnut Darell, the EVnut

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    My mildly-educated guess is that it could easily run into a significant amount of extra energy to keep the batteries happy. I would think that the cooling system would have to be active quite a bit even when the car is parked in the heat. There are few things I like less than using energy to go nowhere.

    I would definitely want to get a more definitive answer than "it won't be a problem." Can we quantify "problem" please!
     
  4. bobw

    bobw Tesla Reader

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    How much current does the cooling system need? That could be a valid reason to put a PV panel on the car.

    Let's see. 1 kW/m2 * .25 PV efficiency = 250 watts

    Martin Eberhard's Wasting Energy like Two Really Nice Refrigerators « Tesla Founders Blog blog entry states that the coolant pump used 146 watts.

    But is it better to spring for the PV APU or to park in the shade?
     
  5. SByer

    SByer '08 #383

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  6. bobw

    bobw Tesla Reader

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    Hm. A portable PV Canopy.

    Design criteria:

    1) Folds and fits into the Roadster boot.
    2) Doesn't blow away.
    3) Doesn't mar the paint.
    Other considerations? Cost? We're selling to Tesla Roadster owners, here. Easy to set up?

    You'd park a bit back from where you really want the car, set up the canopy, and roll the Roadster forward onto the feet. Then plug it in.

    {Tongue FIRMLY in Cheek}

    OK. I've done the hard, executive part. Now we just need some mechanical and electrical engineers to put in the finishing touches.
     
  7. vfx

    vfx Well-Known Member

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    Why not a (lockable) car cover? 14526_lg.jpg Like this scaled up.
     
  8. bobw

    bobw Tesla Reader

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    #8 bobw, Apr 1, 2009
    Last edited: Apr 1, 2009
    Simple. Elegant. Much better than my concept.

    I hated folding mine. I only used it when I left the car at the airport.

    How would it plug into the charging port? Are we asking Tesla for an APU port? Would a third-party mod void the warranty?
     
  9. doug

    doug Administrator / Head Moderator

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    I noticed a little warning sticker inside the door jam of VP24. It said something about exposing the batteries of temperatures in excess of... I forget. It might have said 115 degF, affecting their lifetime. Shoulda snapped a photo.
     
  10. iknowdoyou

    iknowdoyou Member

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    Interesting. Here's hoping that I don't have to restrict my driving my Model S to nighttime only in the Arizona summers.
     
  11. DaveD

    DaveD EVs Kick Gas!

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    Here ya go:

    3405473926_4b54c91135_o.jpg
     
  12. EVnut

    EVnut Darell, the EVnut

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    If you're driving around in 140° weather, you have bigger things to worry about than the batteries!
     
  13. Palpatine

    Palpatine Banned

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    Does that mean global warming and Tesla are not a good mix?
     
  14. iknowdoyou

    iknowdoyou Member

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    Well, I put in my order today at the Los Angeles store. I asked the sales person specifically about the Arizona heat, she told me that it wouldn't be a problem, but that it may slightly reduce my range, but will not affect battery life.

    When I asked her about yearly maintenance, and if there would be a store in Arizona in the future, she said that a colleague of hers was in Scottsdale last week, and they expect to have a store there in 2010, since there are quite a few Roadster users there, as well as Model S interest.

    I guess if they're looking to sell there, they must not be too worried about the heat....

    :)
     
  15. Joseph

    Joseph Member

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    Hmm, that's funny. I recall the Honda Insight having a sticker that says the same thing, almost verbatim. 140 degress...paint booth....etc.
     
  16. TEG

    TEG TMC Moderator

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    My neighbor has two Insights, so I snapped a pic of the door jam on one of his:
    3412417279_397f36f352.jpg
     
  17. TEG

    TEG TMC Moderator

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    Care to re-upload? Photo unavailable...
     
  18. TEG

    TEG TMC Moderator

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