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
Start a Discussionhttps://teslamotorsclub.com/tmc/tags/

Slooooowwww supercharging....

Discussion in 'Model S: Battery & Charging' started by STLBrian, Mar 29, 2017.

  1. STLBrian

    STLBrian Member

    Joined:
    May 28, 2016
    Messages:
    7
    Location:
    Saint Louis, MO, USA
    I'm at the supercharger in st Charles Missouri and getting 60-70kw charge rates. I called tesla and they said this was standard rates. But the two cars around me are getting 100kw! I know I used to get 100kw also so what's going on? The two other tesla are just a couple months old and mine is over a year. Are they slowing down older models so new drivers have better experience at the charging station? And yes we are all in different banks. 1a, 2a, and 3a

    Brian
     
  2. Zextraterrestrial

    Joined:
    Mar 11, 2010
    Messages:
    3,741
    Location:
    Humboldt/Los Altos
    Quite a few variables. My car is > 4 yrs old and I have seen 118kW at low SOC that will slow to 60 kW after 5-10 minutes and then get back up to 90kW after a few more. other charges hit 114kW and slowly taper.
    here is a pic of cell temps and SOC from last March, It seems like the lower bound cell temperatures is what pushes the taper in both taper regions(just a wild guess, higher SOC taper begins when you get to constant voltage but also lines up with the cell temp peak) - outside temp was ~50F
    upload_2017-3-29_13-40-3.png
     
    • Informative x 1
  3. MrBigSmiles

    MrBigSmiles Member

    Joined:
    May 22, 2015
    Messages:
    39
    Location:
    United States
    You are lucky, I was at the Dublin, CA supercharger and was only able to get 38kw charge rate on my model S.
     
  4. STLBrian

    STLBrian Member

    Joined:
    May 28, 2016
    Messages:
    7
    Location:
    Saint Louis, MO, USA
    Where did you get that data? I'd love to see this on my car!

    Brian
     
  5. Zextraterrestrial

    Joined:
    Mar 11, 2010
    Messages:
    3,741
    Location:
    Humboldt/Los Altos
    CAN data logger, not sure that the one I still have works anymore. I think there are a few versions out there from others, the one I have was put together by @lolachampcar and info is in this thread Chassis CAN Logging To ASCII Text Plus Graphing
    started from here maybe?
    https://teslamotorsclub.com/tmc/threads/extremely-accurate-performance-data-from-the-can-bus.59094/#post-1281783
    or if not the link at the beginning of the thread is really interesting!
     
  6. TexasEV

    TexasEV Well-Known Member

    Joined:
    Jun 5, 2013
    Messages:
    5,215
    Location:
    Austin, TX
    Please, please, please include SOC when you're reporting a charging rate. Otherwise it's meaningless.
     
    • Helpful x 3
  7. jmsurpri

    jmsurpri Member

    Joined:
    Feb 5, 2016
    Messages:
    348
    Location:
    Beaverton, OR
    Currently on a trip where I have to rely on superchargers and I'm seeing some pretty steep taper. Not sure it's normal. Yesterday I stopped to charge with 15% remaining on my 85D. Car estimated 1h20m to charge to 100%. It started charging at 120kw which was great, but within a couple minutes it was dropping fast. Probably at 60kw in a few minutes. I let it charge an hour and it got to a little over 90% charge.
     
    • Informative x 1
  8. David99

    David99 Active Member

    Joined:
    Jan 31, 2014
    Messages:
    2,704
    Location:
    Brea, Orange County
    That's interesting. I have seen the exact same behavior the last few days at different Superchargers. They start fast, then it drops down and creeps around 40-60 kW for the rest of the time. Very annoying.
     
    • Like x 1
  9. sorka

    sorka Active Member

    Joined:
    Feb 28, 2015
    Messages:
    4,271
    Location:
    Merced, CA
    I've been seeing this for months. Supercharging used to be a positive experience but based on what I consistently see now I won't be buying another Tesla.
     
    • Informative x 1
    • Like x 1
  10. ShockOnT

    ShockOnT Quickish

    Joined:
    Jun 26, 2016
    Messages:
    1,321
    Location:
    Sydney
    It's all about battery state of charge (%).
    You charge at max rate when battery between 20-50%.
    The rate starts to taper from there, and gets very slow as you approach 100%.
    If possible it's best to arrive with 20% then leave at about 60%. Then get to the next charger at 20 and leave at 60 and so on.
    That should only take about 20 min, just time for a pit stop.
     
  11. NikeWings

    NikeWings Active Member

    Joined:
    Apr 7, 2016
    Messages:
    1,847
    Location:
    Los Angeles
    I only use SCs on weekend roadtrips so usuallly at a very low SOC, 5-20%, by the time I pull in depending on route taken.
    For the past couple of months, I've rarely broken 70 and usually hovering low 60s after ramping up. There was a time when 90-100+ was the norm, but I've not hit it in quite awhile. Tesla has rolled out training wheels is my guess.
     
    • Informative x 1
    • Like x 1
  12. TexasEV

    TexasEV Well-Known Member

    Joined:
    Jun 5, 2013
    Messages:
    5,215
    Location:
    Austin, TX
    Yes we're all aware of that. The problems being reported are charging rates dropping quickly at low states of charge, very different performance than we used to see from the superchargers. I guess you're not having this issue in Australia.
     
    • Like x 2
    • Informative x 1
  13. ShockOnT

    ShockOnT Quickish

    Joined:
    Jun 26, 2016
    Messages:
    1,321
    Location:
    Sydney
    Ah I see, although never underestimate what people don't know on this forum :)
    In Australia I have recently seen unusually low speeds, but not consistently low.
    Sometimes moving stalls helps, sometimes it doesn't. Most of the time the speed is normal from the start.
     
  14. JasJ

    JasJ Member

    Joined:
    Jan 26, 2017
    Messages:
    244
    Location:
    Houston, TX
    Did you see the comment in Bjorn latest video? He commented that unplugging at the SC caused the a/c compressor to kick on max and then after a minute or two, plugging back in to the SC had higher charge rate again. He thinks it is either low a/c coolant or a firmware bug.

    Wonder if he's onto something.
     
    • Informative x 1
  15. David99

    David99 Active Member

    Joined:
    Jan 31, 2014
    Messages:
    2,704
    Location:
    Brea, Orange County
    It must be something Tesla has been doing to the software or Superchargers. I have my car for 3 years and use Superchargers a lot. It used to be absolutely reliable and always got a great charge rate. No matter how hot or cold it was outside. A cold battery is an exception, but that's not the problem here. Tesla has definitely changed something that so many see these slower charge rates. I was speculating that maybe my battery is getting old but it seems that people with much newer car have the same issue.
     
    • Like x 1
  16. EVCarGUy

    EVCarGUy Member

    Joined:
    Sep 28, 2016
    Messages:
    168
    Location:
    California
  17. animorph

    animorph Member

    Joined:
    Apr 1, 2016
    Messages:
    483
    Location:
    Scottsdale, AZ
  18. Zextraterrestrial

    Joined:
    Mar 11, 2010
    Messages:
    3,741
    Location:
    Humboldt/Los Altos
    Some of the 'slow'supercharger problems have been thought to be the plug connection being a bit dirty. the SC might be seeing the resistance as the temperature builds up in the connection and they choke the power for safety.
    sounds plausible for the super high turn over SCs that have bad rates even without sharing
     
  19. David99

    David99 Active Member

    Joined:
    Jan 31, 2014
    Messages:
    2,704
    Location:
    Brea, Orange County
    That is a possible explanation for some cases where the charge rate was high for a while and then dropped. I have experienced a few times where the ambient temps where 70-80 and the charge rate dropped 3 minutes after I plugged in. I don't think that was enough time to build up enough heat.
     
  20. Zextraterrestrial

    Joined:
    Mar 11, 2010
    Messages:
    3,741
    Location:
    Humboldt/Los Altos
    it might be possible. If you look at the temps of the battery cells in the graph I posted above, the connection between the charger and the car would surely build up heat much quicker than the batteries that are cooled with liquid and a heat exchanger. I guess the only way to see if this is the case is to see it happen and then unplug and clean the contacts and try again.
    ....but I have matching data at Ukiah where I charge at > 100kW for a couple of minutes (77F ambient) and then it drops to 60-65kW for the remaining charge until the taper drops it lower, so dunno
     
    • Like x 1

Share This Page