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Roadster Efficiency and Range

Discussion in 'Roadster: Technical' started by dpeilow, Dec 19, 2008.

  1. dpeilow

    dpeilow Moderator

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    #1 dpeilow, Dec 19, 2008
    Last edited by a moderator: Dec 19, 2008
  2. graham

    graham Active Member

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    This is a great blog entry!

    And this was not a direct response to JC (Carmack or Clarkson :smile:) but some other tests being done by some owners.

    This graph seems to suggest that at 65 mph, you will get about 200 miles, which is quite a good range.

    I hope they continue with the blog content. This one was a great one.
     
  3. vfx

    vfx Well-Known Member

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    JB wrote
    So when you are out on the town in your Tesla Roadster, you better skip that dessert!
     
  4. dpeilow

    dpeilow Moderator

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    So it would be possible to to drive to Scotland on one charge in 23 hours, not 3 days! :biggrin:
     
  5. Tdave

    Tdave Member

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    #5 Tdave, Dec 19, 2008
    Last edited: Dec 19, 2008
    So 400 mile range is possible ... theoretically.

    Now I want to see someone do a real world trial to see just what's possible.
     
  6. vfx

    vfx Well-Known Member

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    How long in a Prius?
     
  7. Tdave

    Tdave Member

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    So, Mr. Clarkson, I don't see 55 miles on that chart.
     
  8. dpeilow

    dpeilow Moderator

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    Probably 7 to 8 hours.

    Funny - that's exactly what I've said on the company blog (currently awaiting moderation). :smile:
     
  9. Tdave

    Tdave Member

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    I know. I plagiarized you. Hope you don't mind. It was a great line.
     
  10. dpeilow

    dpeilow Moderator

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    No worries - Clarkson deserves to hear that as many times as possible :smile:
     
  11. Tdave

    Tdave Member

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    This also tells us if you are trying to limp back home on a nearly dead battery, keeping it at 15-20 mph is your best strategy.
     
  12. malcolm

    malcolm Active Member

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    Excellent information.

    You have to pick the right time of day to get away with 15-20mph driving, though.
     
  13. doug

    doug Administrator / Head Moderator

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    I though it would be interesting to see how long you could drive (in hours) versus speed:

    3121261608_ce97d37f5d_o.jpg

    3120433823_f87a1ffa40_o.jpg
     
  14. shark2k

    shark2k Member

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    Interesting Doug. If you need* to drive at 65 mph constantly, you would only get about 3 hours worth of driving according to your chart. Electric cars definitely benefit from more city driving over highway driving.

    *need meaning you are on a highway where the speed limit is 65 mph :biggrin:

    -Shark2k
     
  15. Tdave

    Tdave Member

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    Well, keep in mind that those charts assume maintaining a constant speed, not the stops and starts you get in real city driving.
     
  16. doug

    doug Administrator / Head Moderator

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    Back when this forum started, someone was particularly interested in electric car racing and spent a lot of time trying to calculate how long a Roadster my last in a race. I'm pretty sure he started with some constant speed calculations. Anyone (TEG) remember who that was?
     
  17. shark2k

    shark2k Member

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    Yeah, I know. But still. Highway driving has minimal (if any depending on conditions) reason to use the brakes. The city driving gives more opportunity to use the regen. These charts just help confirm that.

    -Shark2k
     
  18. WarpedOne

    WarpedOne Supreme Premier

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    #18 WarpedOne, Dec 19, 2008
    Last edited: Dec 19, 2008
    Sure, but city driving is a great opportunity to take advantage of regen. Unfortunately, Roadster's regen braking really is only first gen tech. No adaptation, only rear wheels. All braking in cities should be done via regen, except emergency braking of course.

    If you are in stop'n' go traffic where you accelerate up to 30 mph and then brake to full stop again and you do that 100 times, with 80% drivetrain efficiency you recoup about 5kWh of energy.
    How much you spent depends on how far you have driven.
     
  19. doug

    doug Administrator / Head Moderator

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  20. malcolm

    malcolm Active Member

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    One way to dirve slowly would be to deliberately place yourself behind a caravan or RV in holiday traffic. They get blamed for the slow speed; you get the good range.

    However, you'd probably need some sort of relaxation music on the stereo.
     

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