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Battery Range

Discussion in 'Model S: Driving Dynamics' started by Markk993, Sep 2, 2016.

  1. Markk993

    Markk993 Member

    Joined:
    May 16, 2016
    Messages:
    67
    Location:
    Las Vegas
    Being a recent owner (2 months) i charged my 2014 P85+ up for the first time to 100%... at fully charged it showed 264 miles... at 90% it shows 234 miles... should this data match up mathematically? I have heard there are algorithms that factor into range calculations but i don't understand them and lastly... am I correct in feeling good about my ranges and where I am at with the overall battery condition?

    thanks all
     
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  2. David99

    David99 Active Member

    Joined:
    Jan 31, 2014
    Messages:
    2,048
    Location:
    Brea, Orange County
    264 / 100 * 90 = 237. Close enough :)
    I've noticed my car doesn't charge exactly to the percentage I set it to. Sometimes it's a little below, sometimes a little above! Also, when you charge to say 90% and let it sit for a while, you lose a few miles just by having the car parked. Even when parked the car uses some energy and the battery loses some. So it's perfectly normal to have a few miles fluctuation.
     
  3. CLLACAB

    CLLACAB Member

    Joined:
    Dec 11, 2014
    Messages:
    137
    Location:
    Simi Valley, CA
    That is exactly the same results that I get.
     
  4. jerry33

    jerry33 S85 - VIN:P05130 - 3/2/13

    Joined:
    Mar 8, 2012
    Messages:
    12,752
    Location:
    Texas
    Try doing the calculation using the Ideal miles setting rather than Rated miles. They seem to mess with Ideal miles less.
    mine is (264/90) * 100 = 293.3/300 = 97.8 or 2.2% down at 74 K miles and 3.5 years. Looks good to me.

    Note that summer and winter readings will vary because batteries have less capacity when cold. (It will show more loss in winter than in summer.)
     

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