DU energy wonks: Have any EV manufactureers used...

[brush]

or explored dynamo wheel power to assist in battery charging?

Would it be worth it, considering the added drag?

[billh58]

1. See this article

Why electric cars can’t charge themselves while driving

One of the main reasons why electric cars can’t charge themselves while driving is the conservation of energy principle. This principle states that energy cannot be created or destroyed, only converted from one form to another. For electric cars, the energy stored in the battery is converted into mechanical energy to drive the vehicle forward. If the car were to try to generate additional energy to charge the battery in motion, it would need an external energy source to do so.

Some ideas for self-charging have been developed but face significant challenges.

https://www.homechargingstations.com/electric-cars-self-charging/

[brush]

3. Thank you. The article at the link explains a lot.

[Bernardo de La Paz]

2. As billh alludes to, Laws of Thermodynamics explain it is impossible. BUT

... you can recover some energy (not much) by regenerative braking

Cars

Many hybrid electric and fully electric vehicles employ regenerative braking in conjunction with friction braking,[55] Regenerative braking systems are not able to fully emulate conventional brake function for drivers, but there are continuing advancements.[56] The calibrations used to determine when energy will be regenerated and when friction braking is used to slow down the vehicle affects the way the driver feels the braking action.[57][58]

It is impossible to recover 100% of energy from any system. The Three Laws of Thermodynamics in abbreviated form:

1. You can't win.

2. You can't break even.

3. You can't get out of the game.



https://en.wikipedia.org/wiki/Regenerative_braking

[brush]

4. Thank you. Seems some energy can be be captured...

by dynamo tech to assist in range, but not much.

Minds are working on it.

[hunter]

9. Our old hybrid loves heavy urban traffic where the fuel economy will shoot up to 100 mpg.

On the highway, if I drive with a very light foot I can get close to 50 mpg.

My wife, who is not a patient person and likes to drive somewhat aggressively, gets about 43 mpg.

[Think. Again.]

5. And then there's ...

...the idea of solar pv car roofs.

We'll need all of this kind of creative thinking to keep chipping away at fossil fuels.

[brush]

7. Yes. We gotta keep at it.

[multigraincracker]

6. Back in 1961 when I was 12 years old

I invented a car that never needed any fuel. it had large rear wheels with small ones in the front. it was always going down hill.

[brush]

8. Heehee. I used to think using opposite poles of magnets...

suspended somehow on a rocking device on wheels, would self-propel as the magnet poles would repel each other back and forth from the rocking.

It wouldn't work though as it would require gearing to transmit the motion in one direction, and that weight would make it inefficient.

And then there's the "Flintstones" angle that would be required to get started again after stopping, or to put it into reverse...the driver's big, flat feet to kick start the motion again.