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Can you prevent a plugged in car from charging to 50%?

Discussion in 'Model S: Battery & Charging' started by tnt1971, May 8, 2016.

  1. tnt1971

    tnt1971 Member

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    I am going away for about a week and a half in early July. Since it is the peak of summer I expect it will be hot in NY. I wanted to leave my car plugged in in my garage at a low state of charge, say 20%. With the bottom of the slider being 50%, can I prevent it from charging while plugged in till I get back? I know the timer only lets you delay it for near a day.
     
  2. Ryan MF

    Ryan MF Member

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    Why would you want to keep it at 20%? It is better for the battery to be at half charge.
     
  3. deonb

    deonb Active Member

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    Actually most spec sheets for Lithium battery calls for an ideal SOC at storage of 40%. It's a pity the Model S slider doesn't go down just a tad lower. Although 50% on the Model S slider is really 47% of the full battery capacity. Ehh... close enough.

    Either way, a week-and-a-half isn't really storage.
     
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  4. TexasEV

    TexasEV Active Member

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    It's likely that Tesla knows more about what level of charge is best for its car than what anyone here says. If Tesla doesn't allow a charge setting lower than 50%, that should tell you something. Let the battery management system manage the battery.
     
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  5. travwill

    travwill Member

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    On my longer trips, few weeks or so I always leave mine at 50%, not a big deal though. Technically 50% on the slider is probably around like 60% of the battery capacity since there is the reserve bricking and conditioning capacity at bottom that we don't see, like 7-10kWh or so right?
     
  6. gregincal

    gregincal Active Member

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    Anyway, it's definitely a fine level for storage, and better for the battery than the 20% the OP wanted to do.
     
  7. sorka

    sorka Active Member

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    50% on slider is really 53%.
     
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  8. chipmunk

    chipmunk Member

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    I think you could turn scheduled charging off, plug it in, and then stop charging from the phone app (button on the upper right of the charging screen). Then, when you're coming back, you can re-start charging with the app again. Right?
     
  9. tnt1971

    tnt1971 Member

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    That might work. I will try it before I leave.
     
  10. AB4EJ

    AB4EJ Member

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    Really? I'm puzzled by that, please explain.
     
  11. deonb

    deonb Active Member

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    True. Math is hard!
     
  12. deonb

    deonb Active Member

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    Because 0 is more not really 0 than 100 is not really 100...

    (There is unused capacity both above 0 and under 100, but the above-zero reserve is larger than the below-100 reserve. Hence half is over 50%, instead of my original mistaken under 50%.)
     
  13. Rocky_H

    Rocky_H Member

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    That area would really be the "used capacity", not the "unused capacity". :)
     

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