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Charging inconsistencies

Discussion in 'Model S' started by aleagle, Jun 11, 2017.

  1. aleagle

    aleagle Member

    Joined:
    Mar 22, 2017
    Messages:
    63
    Location:
    Yorba Linda, CA USA
    I have my S60 set to charge to 90%. Some mornings after it charges it's at 183 miles, and sometimes 90 miles. Why the difference in range?
     
  2. mblakele

    mblakele radial cross member

    Joined:
    Mar 7, 2016
    Messages:
    509
    Location:
    SF Bay Area
    Hmm, did you mean to type 90 or 190? If it's 183 vs 90 I'd contact your service center.

    But if it's 183 vs 190 I wouldn't worry about it. State of charge is always an estimate, and 4% isn't that large of a variation. This is part of why I prefer to display state of charge as percent, instead of rated miles. Seeing 183 or 190 creates an illusion of precision that just ain't so. Even percentage points are probably a little too fine-grained, but it's an improvement.

    That said there could be a number of factors involved. Just to mention a couple, you might find that the variation correlates with the temperature swing between the time when charging finishes and when you get into the vehicle. I often see my car charge to 90% by 03:00, then by 09:00 it's at 91% or 89%. Lower numbers seem to correlate with cooler mornings.

    Or... is it possible that "smart" pre-conditioning is enabled? I think it's on by default, but many owners prefer to disable it.
     

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