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 or making a Paypal contribution here: paypal.me/SupportTMC

Regen limited due to cold today

Discussion in 'Model S: Driving Dynamics' started by cinergi, Nov 14, 2012.

  1. cinergi

    cinergi Active Member

    Joined:
    Sep 17, 2010
    Messages:
    2,165
    Location:
    MA
    Haven't seen anyone mention this yet ... It was low 40's (F) today and when I got in my car, there was a yellow dotted line in the regen area indicating regen was limited. I was quite surprised, for two reasons (as compared to the Roadster). 1) It wasn't on/off and 2) it had to be a LOT colder outside for the Roadster to disable regen (I realize we're not comparing apples to apples here -- on/off vs. limited regen)

    Regen slowly increased and was back to normal within 10-15 minutes (I missed when it went back to normal).

    photo 2 (1).JPG
     
  2. Doug_G

    Doug_G Lead Moderator

    Joined:
    Apr 2, 2010
    Messages:
    15,705
    Location:
    Ottawa, Canada
    Wow, I don't believe my Roadster has ever gone into limit mode unless it was sitting for hours well under freezing. I guess the algorithms are more conservative in the Model S. I wonder if this is just increased prudence or whether there is a battery chemistry difference?
     
  3. cinergi

    cinergi Active Member

    Joined:
    Sep 17, 2010
    Messages:
    2,165
    Location:
    MA
    Yeah my Roadster would need to set at below-freezing temps for hours. The Model S sat in ~43F temps for 7 hours or so, mostly in the sun (after being parked in 65-70F temps overnight). Interior cabin temperature while it was parked those 7 hours while the sun was up was 65-70F.
     
  4. Zextraterrestrial

    Joined:
    Mar 11, 2010
    Messages:
    3,605
    Location:
    Humboldt/Los Altos
    The battery in the S is directly under vs the roadster in the 'middle' maybe that has a little difference wrt ambient temps?
    but more likely different control algorithms
     
  5. doug

    doug Administrator / Head Moderator

    Joined:
    Nov 28, 2006
    Messages:
    15,869
    Location:
    Stanford, California
    I was thinking along these lines. Also with that flat pack, the Model S battery has much more surface area per unit volume.
     
  6. jerry33

    jerry33 S85 - VIN:P05130 - 3/2/13

    Joined:
    Mar 8, 2012
    Messages:
    12,533
    Location:
    Texas
    So some enterprising person, perhaps SoftAuthor, needs to come up with an easily removable bottom insulation solution.
     
  7. NigelM

    NigelM Recovering Member

    Joined:
    Apr 3, 2011
    Messages:
    13,198
    Location:
    Sarasota, FL
    Somewhat OT, but would extreme cold affect the touchscreen?
     
  8. jerry33

    jerry33 S85 - VIN:P05130 - 3/2/13

    Joined:
    Mar 8, 2012
    Messages:
    12,533
    Location:
    Texas
    It will make it slower and perhaps dimmer.
     
  9. William13

    William13 Member

    Joined:
    Mar 19, 2011
    Messages:
    937
    Location:
    South Bend
    My car had the same regen limiter the last few days in the morning. I hadn't thought about it. It moderated over a few minutes. Then the line disappeared.
     
  10. efusco

    efusco Moderator - Model S & X forums

    Joined:
    Mar 29, 2009
    Messages:
    4,474
    Location:
    Nixa, Missouri, United States
    Or almost unusable...even the Prius screen in sub 20F is barely usable.


    Evan, Via Tapatalk
     
  11. Zextraterrestrial

    Joined:
    Mar 11, 2010
    Messages:
    3,605
    Location:
    Humboldt/Los Altos
    just use some 3M crazy velcro on the edges and carpet tape for the center to mount a sheet of 10mm neoprene to the underside
    it might help some
     
  12. mknox

    mknox Well-Known Member

    Joined:
    Aug 7, 2012
    Messages:
    8,392
    Location:
    Toronto, ON
    Was the car plugged in? If so, I would have thought that it would keep the battery at optimal temperature. Sounds like the 10 minutes of driving was needed to warm up the pack.
     
  13. jerry33

    jerry33 S85 - VIN:P05130 - 3/2/13

    Joined:
    Mar 8, 2012
    Messages:
    12,533
    Location:
    Texas
    I think it keeps the battery warm and cold enough to avoid degradation. I don't think it keeps it within, say, 10C. That would take a fair bit of energy to do.
     
  14. mknox

    mknox Well-Known Member

    Joined:
    Aug 7, 2012
    Messages:
    8,392
    Location:
    Toronto, ON
    Makes sense. I probably wouldn't want to pay for unneeded kWhs with the car plugged in for extended periods.

    I believe Tesla is working on the ability to "schedule" drive times to pre-heat or pre-cool the car while still plugged in so that you don't waste battery power and range starting out very hot or cold. Perhaps in this scenario they'll optimize the battery temperature too.
     
  15. cinergi

    cinergi Active Member

    Joined:
    Sep 17, 2010
    Messages:
    2,165
    Location:
    MA
    It was not plugged in. The roadster would keep the pack heated when cold out and plugged in. It used a fair amount of power to do so. No idea what the model s does. I'm in a garage and no plug at work so I doubt I'll get the chance to find out.
     
  16. mknox

    mknox Well-Known Member

    Joined:
    Aug 7, 2012
    Messages:
    8,392
    Location:
    Toronto, ON
    I'll be in the same boat (no place to plug in at work) when I get my car.
     
  17. Francis Lau

    Francis Lau P-1456

    Joined:
    May 27, 2012
    Messages:
    514
    Location:
    Bellevue, WA
    A newbie question, why is there a limiter when it is cold?
     
  18. eledille

    eledille TMS 85 owner :)

    Joined:
    Jan 13, 2010
    Messages:
    535
    Location:
    Oslo, Norway
    The chemistry changes when the battery is cold. The lithium tends to precipitate in metal form on one of the electrodes, I think. Anyway, the batteries will degrade rapidly if charged when very cold.
     
  19. KBF

    KBF Model S 2017

    Joined:
    Jun 26, 2009
    Messages:
    557
    Location:
    Steinbach, MB, Canada
    What, Toronto businesses don't have block heater plug ins for employees? Out here there are 110v plugs all over the place, since an ICE can have a hard time starting after sitting for 8 hours or so on a cold day. One reason Manitoba should be great for EV's; we're used to plugging in our cars all winter anyway!
     
  20. brianman

    brianman Burrito Founder

    Joined:
    Nov 10, 2011
    Messages:
    15,235
    Keep in mind a full charge on lowly 110 takes about 65 hours. ;)
    Charging Model S | Tesla Motors
     

Share This Page