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power consumpion in electric vehicle
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Jon Hagen
Posted 2/19/2022 01:58 (#9511869 - in reply to #9511830)
Subject: RE: power consumpion in electric vehicle



Hagen Brothers farms,Goodrich ND
Aussy Harold - 2/19/2022 00:19

As my tag says - retired farmer!

But I have an electrical engineer friend who says "Not possible!"

As a farmer I have overcome many a practical problem - but lets take a look.  What you are suggesting is this.

Have a front wheel drive electric car that needs 10 amps to drive it. Simple!

Now put two generators into the rear wheels, and extract 20 amps from them!  That situation takes us back to the B******* word!

AHAH - I hear you say -  but this vehicle is being towed!  By some means using the 10 amp motors to generate 20 amps.

Convince me that I am wrong!





Aussy Harold and you EE friend, what your missing is the fact that a hybrid or electric vehicle has regenerative brakes. What that means is that when you apply the brakes, it turns the electric motor that drives the wheels into a powerful generator that pumps electric power back into the battery at several times the rate it was being removed to drive the EV., depending on how hard you apply the regenerative brakes. Say it took 30 hp worth of power from the battery to drive the car, a fairly hard application of regenerative brakes may generate 90+ hp of electricity back into the battery. That big motor / generator takes a lot of power to turn which slows the drive wheels and slows the car instead of using the friction brakes.
All it would take for an EV to recharge its own battery while being towed is to have a tow rig capable of towing the EV at speed while the EV driver applied the regenerative brakes at a rate that will generate power back to the battery at twice or more the rate it would be removed from the battery if it was driving down the road at the same speed.
So yes, an EV can recharge it's own battery at a rate of 1 mile gained for every mile towed, even though losses are involved, all it takes is a powerful tow rig to pull the EV at speed while the regenerative brakes are partially applied.
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