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Vampire drain while plugged in?

Discussion in 'Model 3: Battery & Charging' started by toddklaus, Aug 13, 2018.

  1. toddklaus

    toddklaus Member

    Joined:
    Jul 20, 2018
    Messages:
    55
    Location:
    San Jose, CA
    I have a j1779 charger (240v, 30A) and I keep my Model 3 plugged in overnight with charging scheduled to start at 11pm every night. My understanding is that the car will not pull power from the battery if it's plugged in, is that correct?

    According to TeslaFi, last night:

    - Charging finished (limit set to 70%) at 12:21 am
    - Idle between 12:21am and 2:25am and LOST 0.85 miles
    - Sleep between 2:25am and 5:27am, NO range lost
    - Idle between 5:27am and 6:32am (when I went to work), LOST 0.85 miles

    Saturday night:

    - Idle between 2:04am and 6:00am, LOST 4.22 miles

    The car doesn't seem to use any power when sleeping, but loses almost 1 mph when idle, even when plugged in. I've only had the car for two weeks so I'm not sure whether it's related to an update. I've been updated once, from 24.11 to 28.2 but I've seen this both before and after the update.
     
  2. Uncle Paul

    Uncle Paul Active Member

    Joined:
    Nov 1, 2013
    Messages:
    2,034
    Location:
    Canyon Lake,CA
    Plugging in goes directly to the battery. When the battery is full the charging stops.

    The vampire drain will happen even when plugged in. Only when your main battery drops below a certain amount will the plugged in vehicle again take a charge.
     
  3. scottm

    scottm Active Member

    Joined:
    Jun 13, 2014
    Messages:
    2,505
    Location:
    Canada
    Does anybody know the "certain amount" drop for a model 3 that would cause it to retrigger a top-up charge cycle?
     
  4. TexasEV

    TexasEV Well-Known Member

    Joined:
    Jun 5, 2013
    Messages:
    6,846
    Location:
    Austin, TX
    It’s 3% in the Model S and X. There’s no reason to think the Model 3 would be programmed differently, but I haven’t tested it.
     

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