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Using AC when the Model S car is "off"?

Discussion in 'Model S' started by radiantMemory, Sep 1, 2017.

  1. radiantMemory

    radiantMemory New Member

    Joined:
    Aug 22, 2017
    Messages:
    4
    Location:
    Arizona
    How does AC work?
    In a regular ICE vehicle, in order for AC to work (and not just the fan) you would have to turn on the car/engine.
    What about in the Model S?
    I don't want to drain its battery (apparently there are 2 batteries. Obviously the lithium ion battery pack underneath the car, and apparently another battery like the ones you see in traditional ICE vehicles.
    I don't want to drain the other "normal battery" and would only like to use the Li-Ion battery pack.
    Car in question is a Signature 2012 Tesla Model S.
    Thanks!
     
  2. Yggdrasill

    Yggdrasill Active Member

    Joined:
    Feb 29, 2012
    Messages:
    3,345
    Location:
    Kongsberg, Norway
    Don't worry about it. The regular 12V battery is charged from the main battery whenever it falls below a specific state of charge. This happens seamlessly without you noticing.
     
  3. zentage

    zentage Member

    Joined:
    Dec 29, 2014
    Messages:
    30
    Location:
    Norway
    you can activate AC from your IOS or android app. Preheating or precooling the car is awesome :)
    It drains from the main battery - hence you will loose range.
     
  4. GSP

    GSP Member

    Joined:
    Dec 28, 2007
    Messages:
    2,249
    I ran the A/C in my Model S for over 3 hours in 90+ degree F heat while watching the eclipse. It used about 10 miles of range from the battery. There is much less noise and heat rejection from the car compared to an ICE vehicle, which is very nice.

    GSP
     
  5. Brass Guy

    Brass Guy Member

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    Jan 5, 2014
    Messages:
    602
    Location:
    Stoughton, MA
    The app will turn on climate control for about 30 minutes. Its great for getting the car ready.

    There's also the unofficial "camping mode." (Put the car in Neutral, apply the parking brake using the touch screen.) The car will stay on indefinitely, including climate control. You can stay in the car, or exit and lock the car. During the eclipse road trip (had some food and a small cooler in the car) I left the AC on for 8 hours in the sun, 90F outside. It used about 30 miles of rated range. It worked out wonderfully.
     
  6. mknox

    mknox Well-Known Member

    Joined:
    Aug 7, 2012
    Messages:
    9,014
    Location:
    Toronto, ON
    FWIW, the a/c compressor runs directly from the HV main battery pack while the fan and controls works from the 12v system. The car keeps the 12v battery topped off from the main battery via a DC-DC converter which kicks in periodically as needed (even when the car is parked and off).
     
    • Informative x 1

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