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Proof - Rated range dropping due to ambient temperature

Discussion in 'Model S: Battery & Charging' started by Denarius, Jan 10, 2016.

  1. Denarius

    Denarius Active Member

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    I've noticed that my rated range at 90% has been slowly dropping moving from autumn into winter. I've speculated that it is due to the temperature of the battery when it completes the charge. I believe I've now proved it.

    image.jpeg

    My charge level has not moved from 90%. This month I'm down to 219-220 miles on a 90% charge with range mode disabled. To raise the heat of the battery, I turned on "Max Battery Power" then plugged in my car and told the car to charge immediately instead of waiting for my scheduled charge. The result was 224 miles of rated range at 90% with range mode disabled.

    I believe this proves that ambient temperature will cause the rated ranged to lower during cold seasons, and increase again as temperatures warm.

    I'd like to see others in cold climates repeat this experiment and post their results. In case it matters to anyone, my P85D has about 27k miles on it.
     
  2. msnow

    msnow Active Member

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    @FlasherZ collected data over a longer period of time during his research of the impact of temperature and rated range here:
    Displayed Range and Seasonality

    Definitely worth the read.
     
  3. Denarius

    Denarius Active Member

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    Thanks for the tip! Great thread.
     
  4. sorka

    sorka Active Member

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    Indeed it does appear that way. If you want to see it pop right back up, enable max battery about 30 minutes before it finishes charging. You can also do this after it finishes charging and if you're connected to shore power still, the rated range will rise as the battery warms up.
     
  5. msnow

    msnow Active Member

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    Where do you find that setting? Don't see it in the manual.
     
  6. BertL

    BertL Active Member

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    I believe you just move the charge % slider to the right.
     
  7. msnow

    msnow Active Member

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    Or maybe it's the max battery power switch for "P" cars?
     
  8. FlasherZ

    FlasherZ Sig Model S + Sig Model X + Model 3 Resv

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    That's the setting for ludicrous mode that will heat the battery to deliver maximum power. You don't get that unless you have a Ludicrous-equipped car, I believe... or is it extended to PxxD ?
     
  9. msnow

    msnow Active Member

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    That's what I thought. Thanks.
     
  10. Denarius

    Denarius Active Member

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    It is there on PXXD as well. Which is how I enabled it, I did not move the charge slider.
     
  11. FlasherZ

    FlasherZ Sig Model S + Sig Model X + Model 3 Resv

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    Thanks for the clarification ... I couldn't recall whether it was ludicrous-only or insane-only. :)
     

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