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Range Anxiety how close do you cut it - and have you been bit?

Discussion in 'Model 3' started by mike123abc, Oct 30, 2018.

  1. Big Earl

    Big Earl Supporting Member

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    I’m right there with him. 8,900 miles in just over 2 months. I’ve run it down to 9%, which I prefer not to do because it takes longer for the Supercharger to ramp up. The sweet spot is an arrival between 12% and 15%.

    I think a lot of folks are in for a winter surprise. Be sure to leave yourselves an extra buffet and don’t plan on charging first thing in the morning (a cold battery won’t charge).
     
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  2. Big Earl

    Big Earl Supporting Member

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    Audis use a bespoke rain sensor whereas Tesla uses camera vision. The vision programming needs time to improve before it will perform as well as a dedicated sensor.

    1.) range is reduced in the rain because it takes more energy for the tires to displace the water on the road’s surface. The same applies for snow.

    2.) cold temperatures can have a varying effect on range. On a long trip, the range impact isn’t as bad as a bunch of short trips. The biggest factor is the additional heating required for the battery and interior. Short trips mean more heat cycles, which uses more energy.

    3.) speed has such a big impact due to wind resistance, which increases at the square of velocity. Head winds and tail winds have a similar impact on range. Driving 70 MPH with a 10 MPH headwind is similar to driving at 80 MPH.
     
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  3. Nate977p

    Nate977p Member

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    On the wipers, I agree. But this seems to be one place they got a bit too excited; use the wiper sensor that works well instead if thousand of hours of R&D. I'd rather them take risks and most of the time they have a great, unique, class leading product. This is one that did not have that result, but will improve

    1) Gotcha. So it is to due with tires, not a change in wind resistance.

    2) Makes sense.

    3) This I still do not understand. I understand wind resistance but the efficiency decrease on an EV seems drastically worse than my ICE. Is there really nothing else at play?
     
  4. Nik a

    Nik a Member

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    Got down to 6% the other day, most days i finish up around 12-15%
     
  5. Big Earl

    Big Earl Supporting Member

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    The ICE masks it’s efficiency loss by being horribly inefficient to begin with. If you test a gas car’s fuel economy drop in the rain, I think you’ll find that it’s similar to an EV ... about 10%.

    It also doesn’t help that a lot of people don’t pay attention to their fuel mileage. I’ve spoken with many people who roughly estimate how many miles per tank they get rather than how many miles per gallon. The EV presents the information in a way that’s harder to ignore.
     
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  6. lolder

    lolder Member

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    They won't charge a Tesla.
     
  7. spinbackwards

    spinbackwards Closed

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    Really? What's the payback in being a Tesla snob?
     
  8. brobinson

    brobinson Member

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    I got down to 15 miles on both ways going from the Cleveland area to Baltimore. The built in trip planner really doesn't factor in all of the variables it needs to. I left from my house to breezewood PA (254 miles away) at 305 miles charge and arrived with 15. On the way back, I planned on stopping twice anyways, but inclement weather really forced my hand. On paper, I should be able to make it out there with only one stop.
     
  9. Nate977p

    Nate977p Member

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    That I think I can buy. If an ICE is typically 30% thermally efficent MAX, and wind resistance causes a 30% loss in efficiency, that will impact that 30% efficent ICE way less than a 95% efficent EV.

    I have an extremely details Excel sheet of my MPG for nearly every mile I've driven the current car, so thats not me :)

    On my other point, are the motors much less efficient at higher RPMs?
     
  10. Nate977p

    Nate977p Member

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    Why do you say that? I've seen YouTubes of them charging an S. I agree they would be very slow (~3 mph) but better than nothing if stranded.


    ???
     
  11. Helmuth

    Helmuth Member

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    Had it happen two weeks ago. Car shut down with 12 (rated) miles left (4% SoC). Less than 1 mile from the Supercharger I was driving to...
    Had it towed to the Service Center since I could plug it in at the Supercharger without any energy left to unlock the charge port. They jump started the 12V battery m drove the car inside (which I didn’t know was possible) and charge it at their Supercharger, switched out the 12V battery (free of charge!!!) and I was good to go again!
     
  12. Saghost

    Saghost Well-Known Member

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    Unless you're driving in the Midwest or Mountain West, especially in the middle of the night. Worst range anxiety I ever had with any car was my 84 Chevy pickup in the middle of a Sunday night in rural Utah in the late 90s. Stations are 40+ miles apart, not always labeled clearly - and 90% of them were closed.
     
  13. voip-ninja

    voip-ninja Give me some sugar baby

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    Have lived in CO my entire adult life and have driven in rural Utah in the dead of night too. Still easier to find a gas station or even someone who will pull over and offer to give you a few gallons of gas than to find a place to charge electric car at anything better than a snail's pace.
     
  14. voip-ninja

    voip-ninja Give me some sugar baby

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    Probably less drastic than the payback of being ignorant of the limitations of an EV and being left stranded in the middle of nowhere.
     
  15. lolder

    lolder Member

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    The YouTube I saw the Honda wouldn't work but a Generac did. It costs $700 and weighs 50 lbs. I think paying attention to charge level is a better idea. In the M3, the battery icon turns orange with 20% remaining and red with 10%. A gas car fuel gauge usually reads empty when there is several gallons of fuel remaining in the tank which may be about 10%. Driving a Tesla to the red is like running to empty. Bad idea.
     
  16. rafacq

    rafacq Member

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    As you may know, there will be no SC in Wichita Falls, instead it is being built in Henrietta, TX, which is about 20 miles southeast of WF. Hoping it opens by the end of this month, Sep 2019.
     
  17. TomLee

    TomLee Member

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    My guess is that the Tesla M3 was designed to boost its efficiency in every aspects, being its shape, its weight, even its aero wheel cover. So small impact to the ICE car maybe a big impact to TM3. Tesla claimed the aero cover boost the range for 3% to 5% on it's own, while I've never heard any ICE car get a range impact by changing it's wheel.
     
  18. vickh

    vickh Active Member

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    did they say why it shut down with 12 miles? Charge port not opening is a big problem. Couldn't you or they do that manually

    Why would the 12 V be a factor?
     
  19. vickh

    vickh Active Member

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    Good points.
    So what's the optimal highway speed?

    How about windows down @ say 30mph vs AC?
     
  20. StellarRat

    StellarRat Active Member

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    Is that why they call you "Big Earl"?
     
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