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Roadster battery: Sudden Range/Charge drops

Discussion in 'Roadster' started by m0rph, Feb 21, 2015.

  1. m0rph

    m0rph Member

    Joined:
    Nov 20, 2014
    Messages:
    488
    Location:
    Belgium
    Hi Guys,

    I bought a 2012 Roadster back in November and have enjoyed it for over 16000km so far, the car has 29000km in total now. CAC is still very healthy at 157.72 and has not moved much since the car was new.

    But in those few months, I experienced 3 unexplainable battery charge drops.

    Yesterday I arrived home with 74km range left. I could not immediately access my garage, so I parked it outside for max 1 hour. I got back in and range had dropped to 42km.

    This is a graph of a similar drop that happened last month, when SOC dropped from 20% to 7% in the first half hour after driving:

    Drop.JPG

    As my car is till under warranty for 2 more months, I need to figure out if this is something they need to address or not.
     
  2. djp

    djp Roadster 2.0 VIN939

    Joined:
    Aug 28, 2011
    Messages:
    1,108
    Location:
    Toronto, Canada
    I've seen the same thing happen after driving to a low SOC, parking for a hour then getting back in the car. The range estimate seems to be unstable at low SOC, especially when restarting the car after a long drive. No other issues with the battery, and my CAC is holding in around 156. I'm chalking it up to a bug in the algorithm.
     

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