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No regenarting in cold weather

Discussion in 'Roadster' started by Stefan T, Jan 5, 2016.

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  1. Stefan T

    Stefan T Member

    Joined:
    Jan 31, 2015
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    Location:
    Sweden
    To day when took my roadster on work and should drive home there was no regenering
    I check the temp on the battery and it was 9C the reganarating came back same time as temp came to 10C

    It was -5C outdoors and have been below zero for some days. I have the roadster in a cold garage on the night it's only little warmer than outdoors
    I have seen it ones before

    Are this normal?
     
  2. green1

    green1 Active Member

    Joined:
    Mar 25, 2014
    Messages:
    4,552
    Location:
    Calgary, Alberta, Canada
    to protect the pack it won't charge when cold, so yes, this is perfectly normal, once warm the regen will return.
     
  3. ViperDoc

    ViperDoc Roadster 1305

    Joined:
    Jun 24, 2011
    Messages:
    310
    Location:
    Vermont
    Frozen regen

    Yes. As soon as the battery has warmed itself to the point it can safely be charged, your REGEN will work again! I see this in VT a lot in the winter when I have to park outside.


    DJ
     
  4. Kalud

    Kalud Active Member

    Joined:
    May 7, 2013
    Messages:
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    Location:
    Montreal, QC
    Technically, charging the battery (regen) bellow 0C is prohibited by the BMS, because its a damaging process for the cell.

    Source: Charging Batteries at High and Low Temperatures – Battery University
     
  5. Strib

    Strib Member

    Joined:
    Jan 3, 2015
    Messages:
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    Location:
    Alamo, CA
    I've just learned that this is true, of course, for a Model S. But when charging in freezing weather the initial energy is used to warm the battery; when plugged in for battery management energy is used to maintain a reasonable temperature.
     

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