Read it again..... He says right up front in the article,
"On the first part of the steep downhill run, we could recover about 5% of the total capacity through recuperation." ________________________________ From: EVDL Administrator via EV <[email protected]> To: Electric Vehicle Discussion List <[email protected]> Sent: Tuesday, October 28, 2014 8:19 AM Subject: Re: [EVDL] EVLN: What Click-n-Clack know about regen (?) On 28 Oct 2014 at 8:38, Robert Bruninga via EV wrote: > Notice I used 90% into the battery and 90% out to give a net 81% battery > efficiency (to match the 80% claimed by some EV's). I seem to recall that charge efficiency of batteries is very close to 100% when they are below 80% SOC. I'm quite sure this is true for lead, and probably for other types too. I think you're to quick to convict regen without a fair trial. In the real world it typically increases range between 5% and 20%. In very hilly conditions it can be quite significant. One example : http://www.brusa.biz/index.php?id=43&L=1 Regen is probably not worth it for folks who use series motors. It calls for too much additional hardware and you're probably better off spending that money on more battery capacity. However, it's relatively easier and not all that costly to add regen to sepex and induction motor controllers, so there it's easier to justify. It also has some often forgotten benefits, particularly for lead battery users. By keeping the battery at a higher SOC during a given use, it can reduce battery depreciation. Also, periodic high current charging (higher than most overnight chargers can produce) is healthy for lead batteries, as long as they're below 80% SOC. IMO burning off an EV's kinetic energy as heat in the mechanical brakes is usually just plain wasteful. Besides, though it's purely a matter of opinion, I find EVs with regen much more pleasant to drive than those without. Coasting is fine and a good idea for efficiency; I just like to have regen available. 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) -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20141028/46cd63bd/attachment-0001.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)
