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Charge rate affected by temperature?

Discussion in 'Model S: Battery & Charging' started by Big Pete, Apr 3, 2016.

  1. Big Pete

    Big Pete New Member

    Joined:
    Apr 1, 2016
    Messages:
    2
    Location:
    Illinois
    Stopped at Rockford Supercharger to charge on trip to Wisconsin, plugged in to 1A and slowly got to 300 mi/hr as anticipated. On my return trip stopped again but this time could not get anymore than 195 mi/hr. Both times started at 20% but the temperature had gone from 50 deg. to 25 deg. Jumped from 1A, to 2A, to 3A with similar results. Should this be expected?
     
  2. mrElbe

    mrElbe Member

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    Aug 17, 2014
    Messages:
    870
    Location:
    Stouffville, ON Canada
    Yes, battery temperature affects charging rate.
     
  3. Big Pete

    Big Pete New Member

    Joined:
    Apr 1, 2016
    Messages:
    2
    Location:
    Illinois
    I know a cold battery would affect the rate, but both times car had been driven 100+ miles before charging so battery should have already been warmed.
    Wasn't expecting a big difference just because the drop in ambient temp.
     
  4. Rocky_H

    Rocky_H Member

    Joined:
    Feb 19, 2015
    Messages:
    896
    Location:
    Boise, ID
    It will be warm-ish from being used, but the temperature requirement for recharging lithium ion batteries is tougher than for discharging, so your battery was warmer than 25 degrees and can run the car at that temp, but not warm enough to take a really high recharging current yet.
     

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