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P90DL "Max Battery Power" mode

Discussion in 'Model S: Battery & Charging' started by ionking, Oct 30, 2015.

  1. ionking

    ionking New Member

    Joined:
    Oct 30, 2015
    Messages:
    3
    Location:
    Tiburon, CA
    This morning I engaged the "Max Battery Power" option for the first time on my recently delivered P90DL. The user interface on the option is a bit clunky (the only real way to tell if it is ON or OFF is to see if it is in "Preparing" mode after you hit the button. I had driven the car modestly hard for about 40 minutes prior to turning it on (maybe 56 degrees outside) but it still took about 10-15 minutes more of driving before it indicated that it was heated up sufficiently to reach Max Battery Power status. I then zipped off from a light a little bit (it wasn't a good spot for gunning it for much above 45) and it did seem a tad quicker. I then did a u-turn and pulled into my San Mateo Supercharger station to plug in. I plugged in and a few minutes later I noticed that the car was making a ton of noise, basically the fans were blowing super hard. After about 15 minutes the fans slowly began to slow down. Stopped after 25 minutes maybe. I guess my question is how bad is that "Max Battery Power" mode for the battery over time? Is running the batter at that high-temp harmful? I have never heard the fans go on at all before even after a few Ludicrous mode starts.

    -T
     
  2. demundus

    demundus Member

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    Jul 5, 2015
    Messages:
    276
    Location:
    Oceanside, CA
    The fans go on almost always when you're supercharging. The battery gets crazy hot, and the fans will cycle on and off and spin hard.

    Edit: to account for the "tapering off", it might have something to do with more power (read heat) being output by the supercharger which is designed to give you less and less charge as you "fill up".
     
  3. ionking

    ionking New Member

    Joined:
    Oct 30, 2015
    Messages:
    3
    Location:
    Tiburon, CA
    I guess the way to test this is to drive in Max Power Mode for a bit and then just park normally (not charging) and see what happens. I have used the supercharger previously but I did not stick around very long so perhaps the fans were quiet by the time I got back about 35 minutes later. I assume that Tesla has engineered the battery well enough at this point that it would not allow you to heat it up beyond safe levels. Perhaps it was the Max Power coupled with the immediate supercharging that made the fans work extra hard, it was very loud.
     

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