Which number? 65-75%: 80% regen efficiency * 80% drive train efficiency = 64%. Cor hypothesized up to 72%.
20%: several people mentioned a hypothetical 20%; don't remember who without looking. -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Peter Gabrielsson Sent: 19 March, 2014 2:05 PM To: Electric Vehicle Discussion List Subject: Re: [EVDL] How can regen be a reason to buy or not? : EVLN:Fiat500eEV> close to perfect And how do you come up with that number? On Wed, Mar 19, 2014 at 2:03 PM, Peri Hartman <[email protected]> wrote: > Yes, I completely realize that the effectiveness of regen, and range in > general, depend on many factors. Yet, in theory one should be able to > achieve 65-75% effective range improvement. I'm only seeing people report > numbers up to 20%. That's a huge spread. Has no one actually run a > circuit > where they could show a 70% improvement? > > Peri > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On > Behalf > Of Cor van de Water > Sent: 19 March, 2014 1:16 PM > To: Electric Vehicle Discussion List > Subject: Re: [EVDL] How can regen be a reason to buy or not? : > EVLN:Fiat500eEV> close to perfect > > Peri, > It depends on the road and driver. > If you take a long trip with essentially no stops and no downhill or > other regen opportunities, then the only time regen might kick in is > when you stop at your destination. At that time the regen might be just > a single percent of energy recovered and your range is not extended at > all. > > If you drive through a city with a stop-intersection every single block, > then you have lots of regen opportunities and the value is likely more > in the 20-30% range extension. > > Some guys on this list know that they should never charge their EV more > that for example 50% full at home, because they have a looooooong > downhill into town and they do not want to reach the 80% mark before > getting into town, since regen starts to cut out by then. Definitely 30% > or more range extension... > YMMV... > > Cor van de Water > Chief Scientist > Proxim Wireless Corporation http://www.proxim.com > Email: [email protected] Private: http://www.cvandewater.info > Skype: cor_van_de_water Tel: +1 408 383 7626 > > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On > Behalf Of Peri Hartman > Sent: Wednesday, March 19, 2014 12:57 PM > To: 'Electric Vehicle Discussion List' > Subject: Re: [EVDL] How can regen be a reason to buy or not? : > EVLN:Fiat500e EV> close to perfect > > I'm sorry for not being clear. The number I really want is how much it > extends your range. That can be deduced by knowing how much energy is > recovered by regen and then calculating the range extension based on > that > plus all the losses due to rolling, wind, etc. > > I do see figures like 5 to 20%. However, if speeds are limited to be > under > 30mph and regen is "stiff" enough to avoid mechanical braking, I would > expect a much higher number than 20%. What am I missing? Has no one > tested > this? Or are the other (non regen) losses that high? > > Peri > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On > Behalf > Of EVDL Administrator > Sent: 19 March, 2014 12:39 PM > To: Electric Vehicle Discussion List > Subject: Re: [EVDL] How can regen be a reason to buy or not? : EVLN: > Fiat500e EV> close to perfect > > On 19 Mar 2014 at 9:29, Peri Hartman wrote: > > > I don't think my question has been answered: what is the actual > > effective efficiency of regen when driving in the city with lots of > > hills, lots of stop and go, and speeds under 30mph? > > Are you asking about the efficiency of regen itself? With software > controlled inverters and AC motors, I would think that if the drive > system > is, say, 80% efficient during motoring, it should be close to that when > regenerating. > > If you're asking how much of the vehicle's kinetic energy is recovered > by > regen, that might be judged by how much it extends range. I've read > that > the range extension of regen varies from 5% to 20% depending on terrain > and > driving style. Lots of use of stop-and-go (slowing down without using > the > friction brakes), and/or lots of hills will tend to push it toward the > higher number. > > 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) > > > > _______________________________________________ > 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) > > > > _______________________________________________ > 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) > > -- www.electric-lemon.com -------------- next part -------------- An HTML attachment was scrubbed... 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