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Range efficiencies according to Tesla

Discussion in 'Australia & New Zealand' started by omniwolf, Mar 17, 2016.

  1. omniwolf

    omniwolf eNizl

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    Hey guys,

    After discovering that Tesla has taken down their range calculator, which was really cool, I found that someone had dug up the backend data for this, which still exists!

    70D
    85
    85D
    P85D

    It's not pretty, but the info is there. To distil the best way to drive (and this might be obvious, but I thought I'd write it down):

    1. The slower you go, the better
    2. Lights off is better
    3. Windows up is better
    4. Air con off is better
    5. Windows down, air con off is better than windows up, air con on
    6. Temperature (°C): 30 > 40 > 20 > 10 > 0 > -10
    7. 19" wheels is better than 21" wheels

    Nothing too ground breaking. One thing to note, windows down air con off is significantly better than the opposite - at 30°C going 70 km/h in the 70D the difference is 59 kms (67 kms in the 85D). This benefit erodes as you go faster - at 140km/h the difference is 5 km
     
  2. PJF000

    PJF000 TOCA Member

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    You forgot the most important: bare feet is better than lead feet. :)
     
  3. jerry33

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

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    Windows on one side open just a bit are very close to windows closed.
     
  4. kort677

    kort677 Active Member

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    no, no no! the lights use almost no energy, it is not better to have the AC off and windows open, the AC uses a tiny amount of energy and having the windows open hurts the aerodynamics of the car causing drag that does increase energy usage.
    one thing that you left off you list is the use of the heater, which is a big drain on power, if you can just use your seat heaters you will limit the draw of energy to keep warm.
     
  5. paulp

    paulp Member

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    Hopefully no-one feels encouraged to drive at night with lights off to save energy, as no energy is needed at all once you are dead.
     
  6. PJF000

    PJF000 TOCA Member

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    If it's on AP (future advanced mode) , dead or alive will be irrelevant.
     
  7. omniwolf

    omniwolf eNizl

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    It's nice that you have your opinion, but my data is coming straight from Tesla, and I'd guess they know their cars pretty well :)

    again; it's not my list. But from what I've read you're correct here.
     
    • Like x 1
  8. Mark E

    Mark E Member

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    Not sure where you read that windows open is more efficient than AC. It's not correct at anything over about 50km/h.
    Let's also look at lights - they'd use less than 500W. At 100km/h you are therefore using 0.5kWh/100km extra with lights on. Considering the car uses 200Wh/km it'd use 20kWh for the 100km, so with lights on 20.5 or 2.5%.. maybe.
     
  9. paulp

    paulp Member

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    Wonder what impact lights have on the range of an ice car?
     
  10. svp6

    svp6 Member

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    My data also comes from Tesla - that is my own Tesla :). My P85D has the lowest energy use at ~ 80F ~26.6C, with air-conditioning on and windows up. On cruise control at 70-75 mph (115-120 km/h) it goes slightly below rated range.
     
  11. omniwolf

    omniwolf eNizl

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    Not sure where I read it? Did you read my post? I linked to all the sources. It's from Teslamotors.com - it's their range calculator data.

    Windows up, aircon on:
    On the 85D, 19" wheels, 30°C, at 70km/h you'll get 621 kms
    On the 85D, 19" wheels, 30°C, at 110km/h you'll get 415 kms

    Windows down, aircon off:
    On the 85D, 19" wheels, 30°C, at 70km/h you'll get 688 kms
    On the 85D, 19" wheels, 30°C, at 110km/h you'll get 421 kms

    So, sure you'll erode the extra range you had quicker with the windows down, but you're still better off at 110km/h with aircon off and windows down.

    OK, let's look at the data. Assuming 85D, 30°C, windows up, aircon off, 100km/h, 19" wheels
    Lights on: 488 kms
    Lights off: 494kms

    not much, but it does affect it slightly. I never said it was a huge difference, and I considered not even mentioning it as it's pretty obvious (lights use power > power require battery).


    It's a good question. I had assumed negligible, until I read that modern ICE cars will sometimes have regenerative breaking - they use the breaking to charge the 12V battery instead of the alternator where they can. Why? Because the 12V battery is having to run so much electronics in the car, it was actually reducing the engine power as it had to keep spinning the alternator to power the battery. crazy!

    P85D, 30°C, aircon on, windows up, 120km/h: 349 kms
    P85D, 30°C, aircon off, windows down, 120km/h: 351 kms.

    *shrug*
     
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  12. FlatSix911

    FlatSix911 918 Hybrid

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  13. Mark E

    Mark E Member

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    That calculator does not have options for Windows up or down, nor lights on or off...

    Do you own a Model S?
     
  14. WhiteStar

    WhiteStar Member

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    Maybe dubious accuracy was the reason for Tesla removing the Windows down option in the Range calculator?
     
  15. David99

    David99 Active Member

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    I remember a journalist who pushed it and the car shut down on him. He drove uphill at high speed and to save energy he turned own the brightness on the main display LOL
     
  16. omniwolf

    omniwolf eNizl

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    ah they put it back! it wasn't there when I posted this. The raw data I posted has more info..

    The website calculator doesn't have windows or lights data, but the JSON file that it pulls the data from does. I wonder if it was just too messy/confusing to include this data on the web front end?

    Yes I own a Tesla Model S.

    Could be! I'd be surprised if it'd get all the way to the website if there were accuracy concerns, though. who knows.

    yes i remember that. he turned off the radio too haha
     

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