Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Self-charge electric vehicle

  1. Jun 15, 2017 #1
    Would it be possible to engineer a self-charging vehicle... Harnessing kinetic, solar, and wind energy?
     
  2. jcsd
  3. Jun 15, 2017 #2

    russ_watters

    User Avatar

    Staff: Mentor

    Not enough to be perpetually self charging unless you only drive it a few miles a week. For continuous driving you can't come close without major sacrifices.
     
  4. Jun 15, 2017 #3

    mfb

    User Avatar
    2016 Award

    Staff: Mentor

    You cannot violate conservation of energy. Harnessing kinetic energy doesn't work because you need the motor to gain that kinetic energy.
    Wind and solar: Possible in principle. In practice the power is way too low to power a regular car that way. You don't want your car to charge for a week just to make a short trip possible.
     
  5. Jun 16, 2017 #4
    What sacrifices??
     
  6. Jun 16, 2017 #5

    mfb

    User Avatar
    2016 Award

    Staff: Mentor

    A typical electric car will need something like 200 Wh/km at typical speed mixtures. If you cover 2 m2 with solar panels, and you live in a sunny area, you might get 2000 Wh per day, or 10 km of driving distance per day - but only if the sun shines.
    Want to drive somewhere because it rains? Better hope you had good weather and didn't use your car the days before.
    Want to drive for more than 100 km at a time? Then you have to charge for weeks and you'll need large, expensive and heavy batteries.

    Wind would be even worse.
     
  7. Jun 16, 2017 #6

    russ_watters

    User Avatar

    Staff: Mentor

    The car will need to look like the photo below and have no air conditioning, no passenger room, no cargo space and you have to lay down to drive it. It will go 60mph, but it'll take a minute or two to accelerate to it. That's for continuous driving. Either that or like mfb says, you can have a normal car that you can only drive an average of a couple of miles a day.

    20150731_085450.jpg
     
  8. Jun 16, 2017 #7

    OCR

    User Avatar

    I think I see some foolishness in that photo, Russ. !?!

    Shouldn't the guy taking pictures have a PV system on his hat to recharge his camera battery ?

    ... and I'll bet Volkswagen is trying to cheat, too ?

    Wait!!... on second thought...
     
    Last edited: Jun 17, 2017
  9. Jun 23, 2017 #8

    mheslep

    User Avatar
    Gold Member

    The world record for a vehicled powered only from PV (no batteries) is not quite there yet, 55 mph. No doubt the course was dead level with no headwind and the time close to solar zenith.
    https://en.m.wikipedia.org/wiki/Solar_car_racing#Guinness_world_record
    Add batteries and and the top speed is indefinitely higher, forcing the solar car competitions to use long distances to avoid nonsensical outcomes.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Self-charge electric vehicle
Loading...