I think you're missing that the bulk of your driving losses are rolling resistance and wind resistance.
On Wed, Mar 19, 2014 at 2:10 PM, Peri Hartman <[email protected]> wrote: > 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. 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