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Garage Temperature

Discussion in 'Battery Discussion' started by DrivingRockies, Jan 31, 2017.

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  1. DrivingRockies

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    Does anyone know what temperature the Tesla battery likes to be at in a heated garage (more specifically, the garage temperature) to keep the car from having limited regeneration, etc?
     
  2. MisterT2

    MisterT2 Member

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    I have been told that 40 degrees is the magic temperature for a warm battery on departure. I haven't had such luck. I think it is somewhere between 50 to 60 degrees.
     
    • Informative x 1
  3. t0mmyr

    t0mmyr Member

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    What if my garage is usually about 80-90?
     
  4. kelly

    kelly Member

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    I ran across this video yesterday and found it to be incredibly informative: I found it by clicking the link in the signature of TMC member David99.

    He doesn't directly address your question but provides a lot of information about battery temperatures.
     
    • Informative x 1
  5. David_Cary

    David_Cary Member

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    Batteries are like humans. But there are competing interests. Storage as cold as possible above probably 35 or so for longevity. That is not the temperature that allows regen. Ideally store at 40 and then warm up to 70 for driving. Then pull into a refrigerator and get back down to 40 as quickly as possible. This neglects of course any damage that might happen from temperature swings. If storing for a long time, the temperature swing is less of an issue.

    The battery will hold more energy as it gets hotter so then you want it closer to 100.

    Competing interests. Storage at about 60 is a good compromise. Garage at 80 or 90 will hurt the life of any battery. The original Volt is interesting in that it will actually cool to 70 if plugged in an 80 degree garage. Tesla uses about 100 as the temp that will tell it to cool down. That is clearly a compromise to limit electricity use. The problem with the volt is that if the garage is 100, it will run all night intermittently to keep the battery cool. Doing that actually warms up the garage a decent amount. So there are people who have a Volt and a Leaf and report the "Volt cooked my Leaf's battery" - which it essentially does since the Leaf just lives at ambient temperature.

    The early Leaf was a great experiment and we all learned a lot. But a big part of it's issue was the design of the battery and not the lack of cooling. But there are truths that apply still to all batteries just to a lesser degree. Storage temperature is a big factor for degradation.

    Chemical reactions degrade things. Reach back to HS Chemistry and remember what temperature does to nearly all chemical reactions.
     
  6. gavine

    gavine Petrol Head turned EV Enthusiast

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    I try and schedule charging to finish around the time I'm leaving. Since charging warms the battery, it is warm-enough for regen and disables the need for the battery warmer to turn-on.
     
  7. arnis

    arnis Member

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    20C - 70F is maximum recommended storage temperature.
    Though wasting electricity to cool garage is not reasonable.
    10C - 50F for more or less fine regen
    Going lower will not prolong life and will reduce regen considerably.

    If you have too limited regen at 20C, reduce charging limit.
     
  8. gavine

    gavine Petrol Head turned EV Enthusiast

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    @arnis: can you explain what you mean by this? I’m not sure I understand.
     
  9. arnis

    arnis Member

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    Even if battery is "mostly warm" if state of charge is high, regen will be limited.
    90% is high state of charge. 70% is not.
     

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