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

Real MPH charging experiences

Discussion in 'Model S: Battery & Charging' started by teslasguy, Mar 3, 2013.

  1. teslasguy

    teslasguy MSP P#1117

    Joined:
    Jun 10, 2012
    Messages:
    672
    Location:
    West Chester, Pa
    I'm really curious what others are experiencing as far as charging speed.
    When I got my car in mid-December I was getting around 16-17 mph charging at 40 amps with a single charger.
    Lately my car seems to be getting more like 21 mph on the same NEMA 14-50 outlet in my garage.
    The Tesla web site states that we should get "up to 31 mph" under these conditions.
    I regularly check the charging status of my car and it always seems to be running at 21 mph and 40 amps.

    I was at my service center this week and pointed that out to my Service Mgr.
    It just happened that he had a car charging as we were talking, and it was showing 21 mph, 40 amps, just like mine.
    He said that is typical of the rate he sees on their 40 amp plug, and is also curious as to the stated "up to 31 mph" claim.
    He said they are supposed to get a HPWC soon and will see if that changes anything with single charger cars.

    So, what are others experiencing?
     
  2. FredTMC

    FredTMC Model S VIN #4925

    Joined:
    Dec 26, 2012
    Messages:
    3,011
    Location:
    Orange County CA
    i get around 25 mph on my nema 14-50. That's @236v And 40a

    what voltage are you seeing when charging?
     
  3. 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
    With voltage always in the 239-241 V range and current at 39-40 A, I'm consistently seeing 27-29 mph from my 14-50 for my 60 kWh pack.
     
  4. dave

    dave Member

    Joined:
    Sep 21, 2012
    Messages:
    451
    Location:
    Greater Cincinnati
    I get about 20 MPH on my 14-50. I believe others have observed that the displayed charging rate seems to be taking your past energy usage into account and is displaying a "projected" actual mph charge.

    The actual "ideal" mile recharge rate is about 31 mph. If you're getting close to that, it means you live in a warm climate and drive like a grandma. :)
     
  5. teslasguy

    teslasguy MSP P#1117

    Joined:
    Jun 10, 2012
    Messages:
    672
    Location:
    West Chester, Pa
    This is interesting. I'm always seeing charge info of 21 mph, 40 amps and 240V.
    Looks like those of you with higher mph rates live in Ca. so far.
     
  6. 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
    More voltage sag and lower mph right now (the car got pretty hot sitting out in the sun for over an hour):

    ImageUploadedByTapatalk1362341458.658605.jpg
     
  7. kendallpb

    kendallpb Model S: P 8061

    Joined:
    Oct 29, 2010
    Messages:
    1,185
    Location:
    MD, USA
    I think I see around 21-23 usually, although I recently changed it to show me WH instead (10 WH I think it is), which helps me not obsess about minor variations or why I don't see a higher rate.

    As I recall from discussions at the TM.com forums, if your SoC is very low, you charge faster, but as you approach finishing, it slows down a little--like the Superchargers, no? I've never had my battery so low that I've noticed a big difference, but I think I did notice it was more like 23-24 when I first plugged in--once it ramped up the amps to 40--but more like 21 when it got closer to finishing. As I recall, anyway,
     
  8. brianman

    brianman Burrito Founder

    Joined:
    Nov 10, 2011
    Messages:
    15,487
    Change your setting to Ideal. If you don't see 30-31 after 5 minutes of charging with pack less than 50%, then be concerned. Otherwise, assume it's a projected/rated/fictional number somewhere in the range [10,infinity). That's how I view it at the moment.
     
  9. Doug_G

    Doug_G Lead Moderator

    Joined:
    Apr 2, 2010
    Messages:
    15,852
    Location:
    Ottawa, Canada
    I don't trust the charging rate display. Perhaps it is showing projected. I'd prefer rated because that's what you're working with on the display while charging. It's also more informative from a "how full" perspective.
     
  10. markb1

    markb1 Active Member

    Joined:
    Feb 17, 2012
    Messages:
    2,318
    Location:
    San Diego, CA
    When you're talking about range, you have to specify whether you're talking about rated or ideal miles. I think there is a bug in the way rated miles per hour charge is reported. I see 31 ideal on a 14-50, but around 20 rated. But 31 ideals miles should equal 27-28 rated miles.
     
  11. damianku

    damianku Member

    Joined:
    Jan 1, 2013
    Messages:
    28
    Location:
    United States
    I get 27-28 on my 14-50 but I am down south and it is relatively warm. 50-60 degrees ambient. Since the charging is basically a chemical reaction I would expect it to be affected by ambient temp.
     
  12. HFh

    HFh Member

    Joined:
    Jan 15, 2012
    Messages:
    210
    Location:
    Atlanta, GA
    I get 24 consistently. I'm usually charging from about 170.
     
  13. 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
    Ambient temp in the garage's probably 60 degrees right now and am seeing this:

    ImageUploadedByTapatalk1362468571.240982.jpg
     
  14. Cliff Hannel

    Cliff Hannel Member

    Joined:
    Jan 22, 2012
    Messages:
    88
    Location:
    Thousand Oaks, CA
    Based on current-at-wall and observed charging efficiency, I put together this chart that seems close to reality. I have it and other charts/calculations posted at http://EVTripPlanner.com (where I'm planning to put a "Trip Energy Planner" that should be able to estimate the energy usage for a particular route within less than 5%, taking into consideration speed, hills, weather).

    ChargingRef.jpg
     
  15. zax123

    zax123 CDN Model S P308

    Joined:
    Jun 4, 2012
    Messages:
    911
    Location:
    Candiac, QC, CAN
    I just picked up my car today. I'm getting only 15.5miles/hr (25 km/hr) plugged into a NEMA 6-50 at 245V @ 40A. Here is a screenshot:

    charging.png

    I think it's about half what it should be. Something doesn't seem right... anyone else think this is wrong?
     
  16. nleggatt

    nleggatt Member

    Joined:
    Dec 7, 2011
    Messages:
    389
    Location:
    Abbotsford, BC
    zax123, i responded to your other question about this on another thread. The charge slows it's charge as it get's more full. Looks like it's almost at the finish line for a standard charge. Therefore it will be a slower charge. Run your car down to about 40-50km (wont be that hard cause you'll find a reason to make a good trip with it lol) then plug it. I saw 50km/hour when I was at 0km charge on the car :)
     
  17. zax123

    zax123 CDN Model S P308

    Joined:
    Jun 4, 2012
    Messages:
    911
    Location:
    Candiac, QC, CAN
    OK thanks man, I hope you're right. I should do a 120km+ trip soon so that might show the behaviour you're talking about.

    Can't wait for my HPWC. :)
     
  18. mnx

    mnx 2013 P85

    Joined:
    May 6, 2009
    Messages:
    2,281
    Location:
    Ancaster, Canada
    The km/h # is meaningless (mine is based on my projected range // Wh/km consumption). AFAIK it doesn't matter if the battery is topping up or if it is nearly empty.
     
  19. montgom626

    montgom626 Active Member

    Joined:
    Dec 15, 2012
    Messages:
    1,339
    Location:
    USA
    Very nice chart. Thank you for the post.
     
  20. scottf200

    scottf200 Active Member

    Joined:
    Feb 3, 2013
    Messages:
    1,273
    Location:
    Chicagoland ModelX S603
    The web site other adapters reference:
    http://www.teslamotorsclub.com/attachment.php?attachmentid=18210&d=1363065456

    I'm curious about this for the modifications to my garages subpanel for the future Model X.
     

Share This Page