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 Post subject: Re: Strategic Driving for Efficiency, 2018 e-golf model
PostPosted: Wed Nov 28, 2018 3:30 pm 

Joined: Mon Nov 20, 2017 12:30 pm
Posts: 147
BarryMW wrote:
My tip is.... remember Regen is not really your friend. Any energy you use and remove from the battery, will lose a percentage if you Regen it back into the battery. There will be inefficiency losses. Just recharging a battery takes about 110% of what you took out.
I can’t prove it, but I expect that these Regen losses are higher than the losses due to air friction,wheel bearings and tires.
So gliding will result in lower losses.

I would like to know the speed where air friction causes gliding losses to equal that of Regen losses. Or, how fast can roll down that hill before it would have saved more energy regening.
I do try (traffic permitting) to hit the top of a hill as slow as possible. Then gliding down the other side will result in max energy being saved as increased inertia and minimum air friction losses.

I’ve been EVing for almost 4 years and never expected this level of fun just driving.


Good advice, and interesting thoughts deeper than my brain can ponder.

In city driving in Santa Cruz we almost never use regen except what can't be controlled (the brake pedal). On the rare occasions we drive over the hill to the San Jose area regen is awesome coming down 17. I use the 3 modes (but never B) coming down the hill and seldom touch the brakes, hardly any "throttle" as well. There is a noticeable rise on the charge gauge from the summit to the bottom of the hill. Driving the car this way results in more range on our over the hill trips than we got before trying this technique, and it is fun and engaging kinda like a manual trans.

That said, when driving a manual ICE car I do not normally use the driveline instead of brakes except when descending long grades. I was taught decades ago by my Porsche mechanic friend that brakes are way less expensive to maintain than drivelines and you also are smoother. (Smoother = faster too.)

2015 e-Golf SEL my wife's daily, shared on weekends
2000 BMW 540iT my daily and our range extender
1986 Audi 4000 quattro "the cockroach" my alternate daily
1983 Audi Ur Quattro "the garage queen" looks pretty and appreciates daily

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