jason98 wrote:So when the lights are off, not even touching the steering wheel and brakes what we have left, just computers? If so those are really inefficient ones.
Is it possible to have the lights completely off while the car is in drive?
Also, you said "a quarter of the KWH (as much as my plasma TV)" - I'm guessing you meant kilowatts, not kilowatt-hours. ie 250 watts. If the car is on and in drive that's entirely possible... there are a lot of electronics in that vehicle. The brake booster and power steering units should always be using SOME power since they need to be immediately available for use.
jason98 wrote:Well, the net weight of the car is a known constant plus adding an average person weight for a driver should be good enough.
You wanted to know how much energy is "wasted" when braking. The only way to do that is to eliminate all the variables you can and try to measure non-regenerating brake power as directly as possible
. Wind is one large factor. Slope of the road (change in elevation) is another. Rolling resistance depends heavily on road surface type and condition. The computer can't account for any of these.
Ultimately, the can will tell you how many KW of regen you are getting. Knowing how much energy is being lost through the brakes is strictly academic since you can't do a damn thing about it either way - especially if you've maxed out regen capacity. Regen power tops out at 30KW so efficiency will be a function of speed and how hard your foot is on the pedal.