The question is really, how much is that small gain worth to you. On a bike it is a fools errand IMO. The cost of regen function is a significant add on to the the low overall price.
On an automotive EV, you have some other issues like controlling the regen, a la Tesla to disallow it when the batteries are near full SOC (>80% = no regen - I think I heard). It is something else to fail, then you might cook your pack. That would be a buzz kill. At any rate, you don't get savings near full SOC so that reduces payback. A DIY'er has a lot more in it sorting out the details, but we don't count that stuff, eh? Would you pay $1K for that? At $5 a gallon you would have to save 200 gallons of gasoline. Or maybe 6000 miles of travel at 30 MPG. If you were getting 5% as an average efficiency, then you would have to travel 120000 miles to get that 6000 miles of savings and break even. (Hope I did that right.) Different assumptions? YMMV. It sounds good if you don't do the numbers. On Mon, Mar 17, 2014 at 6:15 PM, EVDL Administrator <[email protected]> wrote: > On 17 Mar 2014 at 15:01, Michael Ross wrote: > > > 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. > > IIRC, most estimates are that regen lets you recover between 5% and 20% of > your energy, depending on the driving.and terrain. On the flat, open road, > such as Illinois, it's probably not much help. And yes, coasting is better > in most cases. > > It's in hilly regions where you get the most out of regen. That's also > where you really want it to conserve your brake linings (and prevent > overheating). > > You may be able to go like the wind downhill on a bike. However, you > probably don't want to go full speed ahead in a car, especially if the > slope > is steep. And then there's that traffic cop sitting there at the bottom of > the hill with a radar gun ... > > David Roden - Akron, Ohio, USA > EVDL Administrator > > = = = = = = = = = = = = = = = = = = = = = = = = = = = = = > EVDL Information: http://www.evdl.org/help/ > = = = = = = = = = = = = = = = = = = = = = = = = = = = = = > Note: mail sent to "evpost" and "etpost" addresses will not > reach me. To send a private message, please obtain my > email address from the webpage http://www.evdl.org/help/ . > = = = = = = = = = = = = = = = = = = = = = = = = = = = = = > > > _______________________________________________ > 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/b2db306a/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)
