fjpod wrote:I could envision one built into the roof of the car...but to be used as an air scoop when the car is moving, especially at high speed. If it can truly generate 1000 watts as it claims, might it not be enough to get a decent charge while you are moving?
You wouldn't get any 'charge' because you'd be using more electricity than it generates. If it could
generate more energy than it used (more electricity made than the amount of electricity it's presence cost you) then you would be the first person to actually 'invent' . . . . perpetual motion. If you pull that off, you can drive your electric car from coast to coast and never need to stop to recharge
danpatgal wrote: I don't know how it could be done, but if some of the drag the car would normally incur could actually turn a generator and NOT increase the drag on the car, then you can get some of that energy back ... like regenerative braking.
Again, you just described perpetual motion - Getting more energy back than the energy installing the device cost you. None of us know how that could be done
Even if you built a miniature 'car' with a near perfect Cd just to fit one of those 1,000 watt generators, the car's motor is always going to use more electricity moving that wind turbine down the road than the turbine can generate. There are energy losses in the cars propulsion system and also energy losses in the turbine recovering energy from the 75 mph 'wind' the cars motion creates. If you could get an energy efficiency of about 80% (recovering 800 watts while the car is using 1,000 watts) you would be doing very good . . . . but the net result is still a 20% loss, with no net energy being generated - You're still discharging the car's battery more than you are charging it
If you directly linked your electric motor output shaft to the generator's input shaft, you could eliminate lots of inefficiencies. The Cd of the car, the friction of the tires on the road, the inefficiency of the wind on the turbine's blades and you'd probably up your (in)efficiency to 90% or maybe even 95% - You could generate 900 to 950 watts using 1,000 motor watts to run the 'motor-generator'