TMC is an independent, primarily volunteer organization that relies on ad revenue to cover its operating costs. Please consider whitelisting TMC on your ad blocker and becoming a Supporting Member. For more info: Support TMC

Model 3 only charges at 2kW

Discussion in 'Model 3: Battery & Charging' started by navinsiri, Jul 2, 2018.

  1. navinsiri

    navinsiri Member

    Joined:
    Jan 16, 2017
    Messages:
    247
    Location:
    Central NJ
    Everyday I plug in the Model 3 when I get home and the car will start charing at 9pm but only at 2kW. This only happens when the car starts charging itself when using scheduled charging. If I manually start charging then the car will charge at the full 48amps.
    Every night I have to go into the app and hit stop charging and then start charging a few seconds later. Does anyone else have this issue? We're using the Wall Connector wired for 60amps and the Model S never did this.
    Here's a video of what the app shows:
     
  2. jamnmon66

    jamnmon66 Member

    Joined:
    Apr 10, 2018
    Messages:
    381
    Location:
    Brighton, CO
    That's pretty annoying. Mine's never done that. I think you should call Tesla on it.
     
    • Like x 1
  3. silentsnow31802

    Joined:
    Feb 26, 2016
    Messages:
    365
    Location:
    Napa, Ca
    Maybe it only needs 2kw to finish charging within your set schedule? Have you tried it with the battery at a much lower state of charge?
     
  4. dhrivnak

    dhrivnak Active Member

    Joined:
    Jan 8, 2011
    Messages:
    3,454
    Location:
    NE Tennessee
    I think you have a wiring problem. When you start you are at 252V but then it drops to like 238V. That is a LARGE voltage drop meaning you have a lose connection or an undersized wire. Check for heat and ensure connections are tight. If the Tesla sees a large voltage drop it backs off the current.
     
  5. Lloyd

    Lloyd Well-Known Member

    Joined:
    Jan 12, 2011
    Messages:
    5,883
    Location:
    San Luis Obispo, CA
    There were some reports of model 3’s not playing well with gen1 HPWC’s
     
  6. navinsiri

    navinsiri Member

    Joined:
    Jan 16, 2017
    Messages:
    247
    Location:
    Central NJ
    I just called and he said he never saw the issue before. He forwarded the logs to the diag team and I should get a call within a day or two. He also said they can send mobile service so they can get real time data as I reproduce the issue.

    I dont think the car knows when it has to be done by. There's no setting for that

    It drops from 241V to 232V. I'm not sure if a 9V (3.7%) drop is a lot, but I'll definitely double check the wiring where I can.

    I should've been more specific. This is a Gen 2 wall connector that is load sharing with another wall connector, but no vehicle uses that second wall connector.
     
  7. timk225

    timk225 Active Member

    Joined:
    Mar 24, 2016
    Messages:
    1,277
    Location:
    Pittsburgh
    Does the problem happen if you use that other wall connector?
     
  8. jamnmon66

    jamnmon66 Member

    Joined:
    Apr 10, 2018
    Messages:
    381
    Location:
    Brighton, CO
    I'm interested if you find a solution. Please keep us updated if you have any luck.
     
    • Like x 1
  9. NickHoffmann

    NickHoffmann Member

    Joined:
    Apr 1, 2016
    Messages:
    44
    Location:
    Hilliard, Ohio
    This just started happening to me when using scheduled charging. When it starts charging in the morning, it is either at 2A, 4A, 6A or 8A. Charges just fine without scheduled. We have 2 HPWC - I use the one set as "master" and second one is "slave". My wife uses the second one for her S. 100A sub panel in the garage with 100 breaker for each HPWC.

    @navinsiri did you ever hear back from Tesla about this?
     
  10. navinsiri

    navinsiri Member

    Joined:
    Jan 16, 2017
    Messages:
    247
    Location:
    Central NJ
    They said they'll have to send someone to my house to view the logs as the car is doing this. But I said it would be useless since the car doesn't do it often or predictably. Still happens occasionally.
     
  11. mswlogo

    mswlogo Active Member

    Joined:
    Aug 27, 2018
    Messages:
    1,145
    Location:
    MA
    Are you sure your battery isn't a lot colder by that scheduled time?

    How long have you let it sit at 2A?

    If you manually stop and start it and it zooms up to 48A, then forget what I said ;)
     
  12. navinsiri

    navinsiri Member

    Joined:
    Jan 16, 2017
    Messages:
    247
    Location:
    Central NJ
    Yeah this issue started in the summer for me so not an issue of cold battery. But also if you stop then start it then it zooms up to 48A. :p
     
  13. NickHoffmann

    NickHoffmann Member

    Joined:
    Apr 1, 2016
    Messages:
    44
    Location:
    Hilliard, Ohio
    When I wake up in the morning, that is exactly what I do haha! One stop/start cycle and it goes right back to 48A. Frustrating because I can't reliably use scheduled charging to make sure my battery is nice and toasty in the cold morning when I leave for work.
     
  14. smartypnz

    smartypnz Supporting Member

    Joined:
    Jan 23, 2013
    Messages:
    1,205
    Location:
    Monterey Peninsula
    Suspect voltage fluctuations (especially at night).
     
  15. eprosenx

    eprosenx Active Member

    Joined:
    May 30, 2018
    Messages:
    1,231
    Location:
    Beaverton, OR
    Yeah, this sounds like a bug to me. Maybe an edge/corner case since you have linked HPWC’s which is much less common than a single stand alone unit.

    This sounds like a case for Tesla to dive in on. Please do report back what they find (and keep harassing them as necessary!)

    If you were seeing a 16a charge rate or like it backing off by 25% then we might have explanations for you, but what you are seeing is downright weird.
     

Share This Page

  • About Us

    Formed in 2006, Tesla Motors Club (TMC) was the first independent online Tesla community. Today it remains the largest and most dynamic community of Tesla enthusiasts. Learn more.
  • Do you value your experience at TMC? Consider becoming a Supporting Member of Tesla Motors Club. As a thank you for your contribution, you'll get nearly no ads in the Community and Groups sections. Additional perks are available depending on the level of contribution. Please visit the Account Upgrades page for more details.


    SUPPORT TMC