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Missing 2%

Discussion in 'Model X: Battery & Charging' started by mattack4000, Sep 2, 2018.

  1. mattack4000

    mattack4000 Active Member

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    I usually don’t pay much attention to it but I noticed the last four times I charge to 90% overnight. When I get in the car in the morning, 2% would magically disappear. Instead of starting a trip at 90, my car is always an 88%er. I know vampire drain is a problem on the Tesla, but what’s with the consistent 2% drain pattern after a charge. There appears to be something different than your typical vampire drain. Anyone have any idea as to what it is. I am just curious
     
  2. DCGOO

    DCGOO Member

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    1-2% is pretty normal. If it drops by roughly 5% the charger will start and bring it back up. That happens very 3 or so days if I don't otherwise touch them.

    If you really need 90% for your day, either charge to 93% or delay your charging start to 03:00.
     
  3. mattack4000

    mattack4000 Active Member

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    I lose the 2% in 5 hours, it’s been consistent too. I just found it steange
     
  4. DCGOO

    DCGOO Member

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    Is your car a 75 or 100? It will be a greater % off a 75.
     
  5. mattack4000

    mattack4000 Active Member

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    75. When I charge to 90%, it's almost a given that I will end up with 88% starting out. I do remember when I did a long trip, the drain on week 1 was pretty big. The second and third week I barely lost anything. Totally strange. I can see how charging a 12v can drain 2%, but I find it hard to believe I am charging the 12v on a nightly basis. There must be something else that is eating at it
     
  6. DCGOO

    DCGOO Member

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    There are many systems running continuously in the car, even when performing a full power off on the console. Probably upwards of 200 to 300 watts. That will easily produce a 2% drop on a 75 overnight. The same consumption happens on a 100, but the % loss will be less. Remember, if the X is ever totally dead, you will not even be able to open the doors
     
  7. tpham07

    tpham07 Active Member

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    this isn't a problem. my laptop will also drop from 100% to 97-98% and stay there after long hours.
     
    • Like x 2
  8. David99

    David99 Active Member

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    I lose an average of 2-3% over a full day. But sometimes it loses more over a few hours and less the rest of the time. It seems random at times. When I go on a trip I usually charge just before I leave to avoid this issue.

    It will help to turn off 'always connected' and turn on 'energy saving mode'.
     
  9. jboy210

    jboy210 Supporting Member

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    Remember SOC is an estimate. Current flows used to compute SOC can change based on needs when you read the percentage such as from A/C or heater, etc.
     

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