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When I wake up my charge is less than what I set it to

Discussion in 'Model S: Battery & Charging' started by jd2017, Oct 2, 2017.

  1. jd2017

    jd2017 Member

    Aug 24, 2017
    Hey all just picked up my new s75D last week. I have a home charger installed and I plug in every night and have the charge set to 90%. The last two mornings when I check my car via the app the charge is at 88% and it says charging complete. Is this normal? Why did I lose 2% overnight off the battery when the car is plugged in? Last night I verified the car was at 90% before bed.

    I know 2% is not a big deal I am just wondering why the battery would lose charge when it was plugged in.
  2. ShockOnT

    ShockOnT ⚡️⚡️⚡️⚡️⚡️

    Jun 26, 2016
    Yeah the car lets it drop a few % before it starts charging again.

    I suppose it does that so it’s not charging too often.
    • Like x 2
  3. Barry

    Barry Active Member

    Aug 9, 2013
    The car loses about 3 miles per day due to background activity )computers, internet connection, etc.) If you check it frequently with the app, it will lose more. It will recharge back up to 90% after dropping 10-12 miles. Leave it plugged in when you're not using it, even if charging is completed.
  4. Rocky_H

    Rocky_H Active Member

    Feb 19, 2015
    Boise, ID
    I think the threshold is 3% drop from your target level, where it will then do another recharge cycle at your next scheduled time. It's for safety that it doesn't keep the 240V energized in the charge cable and the high voltage battery engaged constantly to trickle charge it to keep it exactly at your 90% level.
  5. bob_p

    bob_p Active Member

    Apr 5, 2012
    If you put the car in maximum energy saving mode, you can reduce the vampire loss.

    But that also loses some functionality - such as constant connectivity to the internet or cabin overheat protection.

    When travelling, I usually turn on the energy saving features - and when we're at home, I usually turn them off, which means the car will lose several % of charge each day - more noticeable if the car is sitting the car for a couple of days.

    During Harvey - we parked our new S 100D in a multi-story parking garage for almost a week - and turned on all of the energy saving features - and when we got back to the car, it had lost very little energy while it was parked...
  6. Electric700

    Electric700 Active Member

    May 21, 2013
    Florida, United States
    JD2017, try setting Energy Saving to On and leave Always connected off (these are settings you can access from the center screen). This should help you save energy overnight.

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