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

After the power is 0, how many KM you can keep driving?

Discussion in 'Model S: Interior & Exterior' started by Shelly, Jul 15, 2015.

  1. Shelly

    Shelly Member

    Joined:
    Jul 1, 2015
    Messages:
    80
    Location:
    China
    [FONT=&#24494]Many new Tesla owners in China worries so much for the mileage range, Yesterday my [/FONT][FONT=&#24494]Model S p85[/FONT][FONT=&#24494] the mileage shows 68KM, the destination supercharge is in 52KM, [/FONT]
    [FONT=&#24494]i prepared to call rescue car, wow so luckily i am safe to the destination.[/FONT][FONT=&#24494] [/FONT][FONT=&#24494][/FONT]
    [FONT=&#24494]And one of my friend told me that, his Tesla run 20KM after his power is 0. [/FONT][FONT=&#24494][/FONT]
    [FONT=&#24494]How about you? Who would be the boldest one?[/FONT][FONT=&#24494][/FONT]
    [FONT=&#24494]Have you experienced 0 power while there is no supercharge station nearby?[/FONT][FONT=&#24494][/FONT]
     
  2. RiverBrick

    RiverBrick Active Member

    Joined:
    Mar 23, 2014
    Messages:
    1,369
    Location:
    Québec
    After the rated range is zero, some people have been able to drive over 30 km. However, in other cases the car has stopped right after zero. In some rare cases, the S has shut down with with a few (1-5) km of rated range displayed on the dashboard.

    In order to have the best chance to drive the most km in such a situation, it is good to drive slower.
     
  3. SabrToothSqrl

    SabrToothSqrl Active Member

    Joined:
    Dec 5, 2014
    Messages:
    1,521
    Location:
    PA
    Driving slower can have a huge impact. I believe I read 40 MPH is the most efficient speed for the Model S. That's not specific, so don't hang me, but doing 70 MPH or 80 uphill will, without question impact range.

    I've pulled into my driveway with as low as 17 miles remaining before.
     
  4. Max*

    Max* Autopilot != Autonomous

    Joined:
    Apr 8, 2015
    Messages:
    4,866
    Location:
    NoVa
    I'm confused, do you have a P85 or P85D or both?
     
  5. apacheguy

    apacheguy Sig 255, VIN 320

    Joined:
    Oct 21, 2012
    Messages:
    3,709
    Location:
    So Cal
    Lowest I've ever been is 1 rated mile. It would not be cool if the car shut down while still displaying range and I would hold Tesla accountable for this. However, once it ticks past 0 anything is fair game.
     
  6. NigelM

    NigelM Recovering Member

    Joined:
    Apr 3, 2011
    Messages:
    13,257
    Location:
    Sarasota, FL
    Always remember that weather, terrain, road surface etc can easily affect range by a few miles (or a lot of miles). Having a couple of miles on the display could quickly turn into true zero, and shutdown, if you were driving uphill and/or in wind and rain.
     
  7. ChadS

    ChadS Petroleum is for sissies

    Joined:
    Jul 16, 2009
    Messages:
    2,399
    #7 ChadS, Jul 15, 2015
    Last edited: Jul 15, 2015
    I think the best way to look at it is to consider that the battery doesn't store miles. Instead, Tesla likely shuts it down when it reaches a certain voltage. The "miles remaining" display is a GUESS at when that voltage will be reached. As Nigel noted, there are many factors that affect when that voltage is actually reached.

    Of course Tesla's guess is conservative to keep cars from shutting down before 0 in most cases (I remember hearing of one case where it did shut down shortly before 0). This also means that you can often keep driving somewhat past 0. But you absolutely can not count on it; Tesla does not tuck away a bundle of miles to pull out later. The voltage could drop at any time.

    As RiverBrick stated, you can improve your chances by driving slowly. (From Tesla's speed vs range charts, I recall 18mph being the optimum speed, though that assumes HVAC is off. From my rough calculations, with HVAC on high it's probably more like 45mph). Not only is there less aero drag, but the lower the power draw on the battery, the more energy you can typically extract before the voltage drops.
     
  8. Hans (Amsterdam)

    Hans (Amsterdam) Model S res#3130

    Joined:
    Feb 9, 2013
    Messages:
    1,072
    Location:
    Amsterdam
    First of all you have to understand that after reaching zero range there is a certain amount of energy (kWh) still available for driving.
    I think under normal conditions ( warm battery ! ) there is about 3,5 kWh available after reaching zero range.
    Possibly under NOT normal circumstances (i.e. cold battery of very warm battery) there will be less energy available.
    The distance that can be driven with this remaining energy depends on your speed and on road and weather conditions.
    The slower you drive, the more economical you drive and the more KM's you can get from the remaining energy.
    If you drive uphill you will get less KM's than when you drive downhill.
    Typical on flat roads driving not faster than 70KM/H you could get as far as 20 KM.

    A very important indicator you have to monitor closely when you reach ZERO range is the power indicator.
    The yellow dotted line indicates the amount of max. power available.
    Under normal conditions you should have 160kW power available when reaching ZERO range.
    If you continue to drive the max. available power will decrease to about 20 kW, just a couple of KM's before there will be a FULL SHUTDOWN of the car.
    IF when reaching ZERO range you have less that 160kW power available, think of this as a WARNING that you might not have the full 3,5 kWh available.

    This is me continuing to drive 22,7KM after reaching ZERO range: Accu tot op de bodem leegrijden
    In this video the driver goes on at the point where I stopped my experiment: Dumbass depletes his Tesla battery - YouTube

    Hope this information helps.
     
  9. apacheguy

    apacheguy Sig 255, VIN 320

    Joined:
    Oct 21, 2012
    Messages:
    3,709
    Location:
    So Cal
    When the car is at or near the trigger voltage there should be very little uncertainty. If 1 rated mile is displayed there should be absolutely no way that the voltage has dropped below the threshold.
     
  10. Barry

    Barry Member

    Joined:
    Aug 9, 2013
    Messages:
    780
    Location:
    Colorado
    If you run it down to 0, set it to miles rather than kms. 0 miles is 1.6x greater distance than 0 kms :smile:
     
  11. jerry33

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

    Joined:
    Mar 8, 2012
    Messages:
    12,753
    Location:
    Texas
    Because it's based on power not distance, I'd treat 15 km as zero. Running on the last three "electrons" is no better than running on the last 3 ml of fuel in an ICE.
     
  12. apacheguy

    apacheguy Sig 255, VIN 320

    Joined:
    Oct 21, 2012
    Messages:
    3,709
    Location:
    So Cal
    Fine, then I'd rather they just display battery voltage when it gets down to a certain point. That way there wouldn't be any "guesses" "calculations" or two ways around it. 0 should mean 0 just as much as 1 means 1
     
  13. spottyq

    spottyq Member

    Joined:
    May 7, 2015
    Messages:
    227
    Location:
    Belgium
    That's not how things work…
    Even with ICE, it is quite difficult to accurately know when the car will stop. Due to liability issues, ICE cars who shows the remaining range either understate it (so that it'll show '0' while you still have some margin) or stop displaying it altogether when it gets low (say, under 50km.)
     
  14. yobigd20

    yobigd20 Well-Known Member

    Joined:
    Oct 28, 2012
    Messages:
    5,793
    Location:
    Skaneateles, NY
    0. when range reaches 0 the car will tell you to pull over and it will shut down. ignore everyone else that says otherwise or else you'll be needing a tow truck.
     

Share This Page