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Heated Garage and battery pre-heating in Cold North US

Discussion in 'Model S: Battery & Charging' started by WillK, Dec 10, 2016.

  1. WillK

    WillK Member

    Joined:
    Dec 8, 2016
    Messages:
    55
    Location:
    Milwaukee, Wi
    Hi

    I have seen some posts about battery heating taking a bit of power and limiting breaking regen for a little. I have a heated garage I keep in the around 40 degree F. Does that eliminate the need to preheat the battery in the AM?
     
  2. GSP

    GSP Member

    Joined:
    Dec 28, 2007
    Messages:
    2,222
    IIRC at 40 F you will get some regen, but not full regen power. No problem driving the car, so you will not need to preheat. However, you might want to preheat for a more comfortable cabin temperature.

    GSP
     
  3. WillK

    WillK Member

    Joined:
    Dec 8, 2016
    Messages:
    55
    Location:
    Milwaukee, Wi
    Thanks! I was definitely planning on heating the cabin up a little and I got the heated seats and steering wheel package those take less energy. What temp does the battery like before full regen?
     
  4. dgpcolorado

    dgpcolorado high altitude member

    Joined:
    Apr 25, 2015
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    1,038
    Location:
    The Western Slope, Colorado
    My sense is that the battery needs to be above 50ºF to have full regen, but I don't have any way to measure that. However, it likely doesn't matter since even at 40º F you will have some regen and the battery will warm up as you drive. I think that you will find that the limited regen isn't a big deal in the flatlands, such as Wisconsin.

    If you do want some more regen, arranging to charge the car just before you leave, rather than as soon as you plug-in, will heat the battery somewhat. I charge at 32 A and a couple of hours of that just before I leave my cold garage (low 30s this time of the year) increases my regen significantly. But I think that you will find that it just isn't a big deal to have limited regen for the first few miles. Even 15 kW of regen will slow you quite a bit when backing off the go pedal.

    My 2¢.
     
  5. Chopr147

    Chopr147 Active Member

    Joined:
    Apr 3, 2016
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    1,540
    Location:
    Wantagh, NY
    I agree. It is in the 50 degree range. I take many short runs and have not had full regen for 3 days :(
     

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