On the human powered side of EVs regen gets the same reaction - it isn't worth the cost and complexity. Mostly, because you are naturally trying to minimize acceleration. It is stopping faster and then speeding back up that saps your strength and endurance. On a really good ride you would never use your brakes.
I think this is an interesting analog for automotive EVs - if you are concerned with cost, want to limit complexity, and seek to be efficient just the same, then it is largely sovled by driving habits. On Mon, Aug 11, 2014 at 4:20 PM, Peri Hartman via EV <[email protected]> wrote: > I would tend to agree with you. There was a discussion a while back (a > year?) about how much regen gives back. I think the number, for my kind of > driving, was around 5% - for a pure EV. In your case, since the electric > motor will be used primarily for acceleration - both from a stop and up > inclines - you may find that the amount of time spent in regen versus accel > approaches 50-50. That might give you a payback of 30-40%. Just a bunch > of guesses, so if you care, do some math :) > > Peri > > > ------ Original Message ------ > From: "Ben Goren via EV" <[email protected]> > To: "Robert Bruninga" <[email protected]>; "Electric Vehicle Discussion > List" <[email protected]> > Sent: 11-Aug-14 12:59:19 PM > Subject: Re: [EVDL] Conversion advice (regen) > > On Aug 11, 2014, at 12:49 PM, Robert Bruninga via EV <[email protected]> >> wrote: >> >> As for regen, the efficiency improvement you get over DC will vary... >>>> Typically the improvement is small, because you just don't spend >>>> that much time braking. ... Learn to make use of coasting and >>>> you can probably match the range improvement of regen. >>>> >>> >>> Amen. With my CITY car I agonized over all kinds of designs for Regen >>> but >>> once I started driving it, I realized I hardly ever used the brakes. >>> (somewhat due to them being old and worn out in the first place)... but >>> still, after also driving a Prius and similarly avoiding brakes or >>> regen, >>> the amount from regen is not worth it (I am going on the assumption that >>> regen in DC traction motors causes undue arcing of the comutator...) >>> >> >> I already drive like that, too...but I'm still anticipating regen as >> being very helpful in my wacky hybrid Mustang. Sure, if it marginally >> improves efficiency by recovering a bit from deceleration, that's >> great...but what I'm *really* looking to use it for is to maintain a >> minimum charge in the batteries in hybrid mode. That will let me use the >> electric motors primarily for acceleration even after the end of the hybrid >> mode driving range. And, since the electric motors are much more efficient >> at accelerating than the ICE, the minimal parasitic drag to just barely >> keep a bit of usable charge in the batteries should still balance things in >> the favor of both economy and performance. >> >> For a pure BEV conversion, I don't think I'd care all that much either >> way about regen. >> >> b& >> -------------- next part -------------- >> A non-text attachment was scrubbed... >> Name: signature.asc >> Type: application/pgp-signature >> Size: 801 bytes >> Desc: Message signed with OpenPGP using GPGMail >> URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/ >> attachments/20140811/e8c7e624/attachment.pgp> >> _______________________________________________ >> 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/20140811/f88e93fc/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)
