Are there any OEM EV's that Don't have regen? I don't know of any. Its kind of a no-brainer that if you can recharge the battery AND save on brake wear at the same time it is a clear benefit. Sure, it's only a percentage, and it will vary quite a bit among people and routes, but still it is recouping energy that would otherwise have been completely lost and turned into brake dust.
Remember also, that most drivers waste a lot of energy. This doesn't change just because they bought an ev. The harder you drive the car the more benefit you get from regen. NYC taxis would definitely want regen. On Mar 17, 2014 1:01 PM, "Michael Ross" <[email protected]> wrote: > I know on an E Bike the time spent braking is almost nil. You naturally > conserve you effort by coasting as much as possible and trying to hit > lights on a roll. Using brakes is a great disappointment. The same is > true for downhill runs - you mostly want to go as fast as you can, regen > would counter that - a lot. I am in the camp that regen is an expensive > waste of $ on an human powered, electric assist vehicle. > > When I am driving a car, it is not that different. I mostly try not to > rush ahead only to stop quickly, and sometimes I can make my commute with > almost no braking. That total time on a 40 minute drive - couldn't be more > than 5 minutes. If I am right, that is 12.5% of time. The inefficiency > would then take half that away > > My estimate of braking time is probably quite high, but I don't know how > much. I would guess no more than 6% return from regen. > > > On Mon, Mar 17, 2014 at 2:03 PM, Peri Hartman <[email protected]> wrote: > > > Tom, thanks for the info. > > > > I'm not sure what you mean in your 2500' climb: first you say regen put > > back > > about 24% of the energy and then you say that (or something) was about > 1/2 > > the potential energy. Are you saying that the regen recouped about 24% > of > > the energy expended in that scenario? > > > > I hope my regen is better than 10% in city driving. In your second > example > > you include some higher speed segments which would add a lot of wind > > resistance. My speeds are normally below 30mph. > > > > Peri > > > > -----Original Message----- > > From: [email protected] [mailto:[email protected]] On > > Behalf > > Of tomw > > Sent: 17 March, 2014 8:16 AM > > To: [email protected] > > Subject: Re: [EVDL] How can regen be a reason to buy or not? : EVLN: Fiat > > 500e EV> close to perfect > > > > "/I'll "second" that regen is important. Another example is city > driving. > > If > > you have a lot of hills and stop & go every few blocks, regen can add a > lot > > of range, even if it's only 70 or 80% efficient. > > > > I don't have an obvious way to measure this. Has anyone else done so?/" > > > > I've posted data from my car on diyelectricar a number of times over the > > last 4 years. I data logged battery I, V, Ah with a TBS gauge, and > vehicle > > miles, elevation and speed with a GPS. Doesn't seem to affect anyone > > though. > > As Lakoff, cognitive scientist, says "If the facts don't fit the frame, > the > > facts are rejected." > > > > My data indicates that around half of my car's kinetic energy goes into > > potential energy in the batteries when stopping. Going down a 9 mile long > > hill, around 2500 ft elevation change, the energy into the batteries by > > regen was about 24% of what it took to drive up, and about half of the > > vehicle's potential energy at the top. On a short drive for a video, > where > > I drove about 100 yards at 25 mph, stopped at a stop sign, turned left > and > > drove about 1/4 mile at max 45 mph, turned right onto a freeway on ramp, > > accelerated onto the freeway and drove about 2 miles with max 70 mph > speed, > > exited, stopped, turned right, drove about 1/4 mile, turned right and > drove > > about 1/2 mile at 35 mph, regen was 10% of the energy used. I've also > > measured around 10% on other, longer local trips. > > > > Summary of some posts here: > > http://www.diyelectriccar.com/forums/showpost.php?p=366384&postcount=20 > > Would have posted here but can't do graphs/figures here. > > > > > > > > -- > > View this message in context: > > > > > http://electric-vehicle-discussion-list.413529.n4.nabble.com/EVLN-Fiat-500e- > > EV-close-to-perfect-tp4668392p4668489.html > > Sent from the Electric Vehicle Discussion List mailing list archive at > > Nabble.com. > > _______________________________________________ > > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > > For EV drag racing discussion, please use NEDRA > > (http://groups.yahoo.com/group/NEDRA) > > > > > > > > _______________________________________________ > > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > > For EV drag racing discussion, please use NEDRA ( > > http://groups.yahoo.com/group/NEDRA) > > > > > > > -- > Put this question to yourself: should I use everyone else to attain > happiness, or should I help others gain happiness? > *Dalai Lama * > > Tell me what it is you plan to do > With your one wild and precious life? > Mary Oliver, "The summer day." > > To invent, you need a good imagination and a pile of junk. > Thomas A. Edison< > http://www.brainyquote.com/quotes/quotes/t/thomasaed125362.html> > > A public-opinion poll is no substitute for thought. > *Warren Buffet* > > Michael E. Ross > (919) 550-2430 Land > (919) 576-0824 <https://www.google.com/voice/b/0?pli=1#phones> Google > Phone > (919) 631-1451 Cell > (919) 513-0418 Desk > > [email protected] > <[email protected]> > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20140317/c562db1d/attachment.htm > > > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > For EV drag racing discussion, please use NEDRA ( > http://groups.yahoo.com/group/NEDRA) > > -------------- next part -------------- An HTML attachment was scrubbed... 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