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

Charging a Model S In the Wild

Discussion in 'Model S: Battery & Charging' started by Todd Burch, Jun 13, 2012.

  1. Todd Burch

    Todd Burch Electron Pilot

    Joined:
    Nov 3, 2009
    Messages:
    4,734
    Location:
    Smithfield, VA
    I'm pretty sure you can dial back the charging rate in the car...so if you don't want to charge at the full 90 kW, dial it back to be nicer to the battery.
     
  2. rsquared99

    rsquared99 Member

    Joined:
    Jan 10, 2008
    Messages:
    239
    Location:
    Surprise AZ
    Probably the next four people in line waiting to charge their car may not agree with the "take longer to charge while I'm waiting" strategy.
     
  3. zdre

    zdre 40kWh Model S P6415

    Joined:
    Jan 18, 2010
    Messages:
    270
    Location:
    St. Louis
    The car will not be able to dial-back DC charging unless the superchargers support this since the power is controlled by the supercharger itself. We do not know yet if this will be possible.
     
  4. AndrewBissell

    AndrewBissell Member

    Joined:
    Apr 16, 2009
    Messages:
    645
    I would think Tesla would be unlikely to allow user choice to down-rate the charge rate at a 90kW super charger for a few reasons:

    1. They know better how fast your battery can take a charge based on how it's been used recently and over it's life. Why offer you the chance to second guess them?
    2. That supercharge station represents a big capital investment. Why would you want it to reduce the number of cars it can potentially charge per day because you let a user turn a 30 minute charge into a 2 hour one?
    3. It's not good for the Tesla brand for cars at supercharge stations to be on charge longer than they have to be ("Oh they say it's 30 minutes but I saw one charging for over 2 hours the other day")
    4. Other Tesla customers will be upset if they turn up to fast charge, there is a car already there, and it ain't gone in around 30 minutes or less.
     
  5. Todd Burch

    Todd Burch Electron Pilot

    Joined:
    Nov 3, 2009
    Messages:
    4,734
    Location:
    Smithfield, VA
    Can't the car send a signal over the connection to tell the supercharger to ease up the charging rate?
     
  6. Todd Burch

    Todd Burch Electron Pilot

    Joined:
    Nov 3, 2009
    Messages:
    4,734
    Location:
    Smithfield, VA
    Regarding 1: Everybody knows that charging at <90 kW is better for the battery than charging at 90 kW. It's not about second guessing Tesla...it's just plain fact. If you'd rather treat your battery a little better, there's nobody waiting, and you have the time, charging at a lower C rate is going to be preferred.

    Regarding 2: Agreed....but in many locations I doubt there will be lines of people waiting at a supercharger for a while. Even with 20,000 Model S's spread around the world, what percent of them are in proximity of a supercharger, and what percentage of those are on a road trip? Superchargers (except those closer to urban areas with higher Model S concentrations) are going to see relatively sparse use for awhile.

    Regarding 3: I don't see this as a big deal. How many people will sit around watching a supercharger for hours? Besides, FUD is FUD. People who want to spread misinformation about EVs are going to do it whether they see a car sitting at a supercharger for 2 hours or not.

    Regarding 4: Agreed...but there are several ways to handle this. This could boil down to courtesy...or, since that is unlikely (hehe), a customer who's waiting for a supercharger could indicate so on their touchscreen (or phone in to Tesla). Since superchargers are connected to the internet, they could kick a user who's been on a supercharger for >75 minutes (or whatever). Just like a server will boot someone who's been idle for x minutes.
     
  7. strider

    strider Active Member

    Joined:
    Oct 20, 2010
    Messages:
    2,920
    Location:
    NE Oklahoma
    Way too complicated. There will be communication between the car and supercharger so it will charge as fast as it can without going over some current and temperature limits Tesla will set. If you're worried about your battery plug into an AC station (there will likely be L2 stations near the superchargers).

    This is likely why Tesla is going their own way w/ DC charging - they weren't happy w/ the signaling capability of Chademo and the others and didn't want to put their battery in the hands of a charger that they (via the car) couldn't control.
     
  8. Lloyd

    Lloyd Active Member

    Joined:
    Jan 12, 2011
    Messages:
    4,886
    Location:
    San Luis Obispo, CA
    Remember that anyone with a Tesla Key Fob can unplug another Tesla. The plug lock is not car specific! Probably a wise thought!
     
  9. Blurry_Eyed

    Blurry_Eyed MS Sig #267, MX Sig # 761

    Joined:
    Dec 29, 2011
    Messages:
    562
    Yes, that's exactly what someone on the Tesla battery team told me about their reluctance to support CHAdeMO. Tesla is concerned about exactly what Strider mentioned above. Now Elon's comments at the annual shareholder meeting seem to indicate that Tesla will support CHAdeMO with his statement that the Model S will be able to charge anywhere. We will soon find out if that statement means CHAdeMO support will happen...
     
  10. gg_got_a_tesla

    gg_got_a_tesla Model S: VIN P65513, Model 3 Res Holder

    Joined:
    Jan 29, 2010
    Messages:
    6,097
    Location:
    Redwood Shores, CA
    Hmm.... that can cut both ways. I don't think I'd want my UMC to be unplugged from my car by anyone, even a fellow Tesla owner. Lloyd, what's your source for this?!
     
  11. kendallpb

    kendallpb Model S: P 8061

    Joined:
    Oct 29, 2010
    Messages:
    1,185
    Location:
    MD, USA
    Yeah this seems like a big problem to me. Some random person who happens to own the same type of car shouldn't be able to affect my car. What's the point of a fob if they're all the same; might as well not even use fobs. Weird; no offense to Lloyd, but this doesn't sound right to me.

    (On the other paw, my car doesn't have a remote/fob, so what do I know.)
     
  12. Lloyd

    Lloyd Active Member

    Joined:
    Jan 12, 2011
    Messages:
    4,886
    Location:
    San Luis Obispo, CA
    It was early on, when the betas were out that I was told that about the fob and charge door. I have not heard it again since. It may have changed!
     
  13. AndrewBissell

    AndrewBissell Member

    Joined:
    Apr 16, 2009
    Messages:
    645
    This I did not know. Thanks!
     
  14. kendallpb

    kendallpb Model S: P 8061

    Joined:
    Oct 29, 2010
    Messages:
    1,185
    Location:
    MD, USA
    Ah...I wonder if the game of Telephone's to blame. Maybe it's just that the betas were like that, which would make sense (they're all owned/used by Tesla; why not keep it simple?). Anyway, no doubt someone will test this long before my number comes up in 2013. ;-)
     
  15. jerry33

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

    Joined:
    Mar 8, 2012
    Messages:
    12,763
    Location:
    Texas
    Well, it's not like they can syphon the electricity out of your car. However, if you were on vacation and charging while dining, it would be a major pain if someone unplugged it.
     
  16. gg_got_a_tesla

    gg_got_a_tesla Model S: VIN P65513, Model 3 Res Holder

    Joined:
    Jan 29, 2010
    Messages:
    6,097
    Location:
    Redwood Shores, CA
    And, if they choose to take off with your UMC...
     
  17. NigelM

    NigelM Recovering Member

    Joined:
    Apr 3, 2011
    Messages:
    13,257
    Location:
    Sarasota, FL
    Roadster owners figured out a variety of ways to secure their cables against theft. I'm pretty sure we'll come up with ways to secure the Model S UMC.
     
  18. richkae

    richkae VIN587

    Joined:
    Jan 15, 2008
    Messages:
    1,917
    Is anybody really worried about this?
    I am more worried about Sharktopus than a fellow Tesla owner taking my UMC.
     
  19. jomo25

    jomo25 P4398

    Joined:
    Mar 16, 2012
    Messages:
    1,938
    Location:
    Tempe, AZ
    Sure, early on, with enthusiasts only having Model S', this may not be an issue. However, if Tesla approaches their goal of 20K per year, it might become a bigger risk.
     
  20. dsm363

    dsm363 Roadster + Sig Model S

    Joined:
    May 17, 2009
    Messages:
    18,235
    Location:
    Las Vegas, NV
    Maybe tesla will add a few HPCs and a NEMA 14-50 outlet to their Supercharger stations as well.
     

Share This Page