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)
