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Question: Is Model 3 Charging Rate at a SC affected by AC use ?

Discussion in 'Model 3' started by SageBrush, Jun 17, 2018.

  1. SageBrush

    SageBrush 2020: Drain the Sewer

    May 7, 2015
    New Mexico
    I should have checked when I was at Superchargers this week ...

    I see up to 114 kW on the car app while charging. I'm curious whether unused Supercharger power can be used for AC. My guess is no but I'm not familiar enough with the power flow to be certain.
  2. nwdiver

    nwdiver Well-Known Member

    Feb 17, 2013
    United States
    ~99% certain the answer is 'yes' but given the amount of energy the A/C uses any time added to the charging session is probably measured in seconds...
  3. mal_tsla

    mal_tsla Member

    Sep 29, 2016
    Austin, TX
    Unless the car is drawing the absolute maximum from the supercharger, the AC won't impact it. The car will draw a little extra to cover the power needed for the AC...

    But, keep in mind that even if the car IS drawing the maximum from the supercharger, in most climates this means the AC is running full blast anyway to help cool the battery. You can hear our X from a mile away when it's supercharging unless it is winter time
    • Informative x 1
  4. clostridium

    clostridium Member

    Mar 6, 2017
    NE Ohio
    The AC draws something like 3-4 kW of energy when running at max in my model s. It could potentially take a little away from charging however two things to consider:
    1. The difference in charging speed is probably barely noticeable since that’s a pretty small proportion of the charging power in most parts of the charging taper except for people charging to really high SOC levels near 100%
    2. Most importantly - and I don’t know the answer to this - we don’t know whether the power to run the climate control for the cabin comes out of the max charging power enforced by the car’s programmed charging taper or not. The SC is rarely putting out something close to its max output to your car. If the climate power comes out of additional kW not reflected on the charging screen it won’t make any difference in charging speed.

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