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Car using wall power after door open?

Discussion in 'Model S: Battery & Charging' started by NickF, Apr 27, 2017.

  1. NickF

    NickF 75D

    Joined:
    Jun 11, 2016
    Messages:
    67
    Location:
    Maine
    Car charged overnight to 90%. I opened the rear door this morning and heard the contactor close in the wall connector. So what exactly am I seeing in the photos below where charging completed hours ago but it starts pulling 10+ amps on rear door open? Thank you.
    IMG_0914.JPG IMG_0915.JPG
     

    Attached Files:

  2. scaesare

    scaesare Well-Known Member

    Joined:
    Mar 14, 2013
    Messages:
    5,105
    Location:
    NoVA
    The car will try to draw wall power for whatever loads it has.

    When you open the door, all sorts of things may happen: HVAC kicks on, dash systems fire up, coolant pumps may kick, radio turns on, DC-DC may notice it need to top of the 12V, lights come on, etc...
     
  3. tpham07

    tpham07 Member

    Joined:
    Mar 21, 2017
    Messages:
    585
    Location:
    Baton Rouge
    When you open the door the car thinks you're going for a drive. it'll warm up everything including turning on the HVAC and warming up the battery cuz apparently its cold up there still in april ;)
     
  4. Rocky_H

    Rocky_H Active Member

    Joined:
    Feb 19, 2015
    Messages:
    1,415
    Location:
    Boise, ID
    It's a given that HVAC will ALWAYS draw from the wall if it is connected. So when you open the door, the car comes partially on, and if there is any heat or air conditioning running, it will immediately start pulling from the wall connector. You can verify/confirm this by turning your climate control totally off, and then going through some walking away and coming back and opening the door.
     
  5. immolated

    immolated Member

    Joined:
    Oct 3, 2016
    Messages:
    54
    Location:
    Las Vegas
    Looks like your heater is on
     
  6. strider

    strider Active Member

    Joined:
    Oct 20, 2010
    Messages:
    3,137
    Location:
    NE Oklahoma
    Yep. Temp set to 74F so you're seeing the draw from the heater and other systems. Seat heater is on too. Car will always draw from "shore power" if connected in order to keep from draining the battery. The same would happen if you used the app to pre-heat/pre-cool the cabin.
     
    • Informative x 1
  7. ThisIsTrue

    ThisIsTrue Dismember

    Joined:
    Nov 29, 2016
    Messages:
    358
    Location:
    'Western Slope' Colorado
    Yep, according to the pics your heat is set to the 70s and your garage is in the 50s. At least one seat heater is also on. Sound system and fans may be running. Etc. Makes much more sense to pull the power for all that from AC than use up your range, no matter what the state of the battery.
     

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