Tesla seems to realize that too. You can adjust the end charge point. For daily use, they recommend a range that looks like it is about 50-80%.
On March 28, 2015 3:39:15 PM MDT, Michael Ross via EV <[email protected]> wrote: >Yes. That is pretty much what the best scientists working on it say. >Keeping it from getting too hot (which may not be all that hot, and I >have >not read anything that tells what temperature or other thermal history >is >implicated) when fully charged should eliminate the degradation caused >by >the reactive, delithiated positive electrode from tearing up the >electrolyte. > >You CAN control how much of a charge you put on it, and you CAN simply >make >sure you run some of the charge off right away. This is bound to >improve >matters. $10k and a some Leaf cells and you might get a study done to >sort >it out better. Rank speculation: NIssan probably won't fund it, or >reveal >if that have - they simple made the problem go away by some needed >modifications to the pack. > >There are other potential problems, but this is what has messed up the >Leafs in places like AZ according to Jeff Dahn. > >On Sat, Mar 28, 2015 at 5:10 PM, Cor van de Water via EV ><[email protected]> >wrote: > >> So - in a sense the availability of QC could improve the Leaf's pack >life >> if you only charge to 80-ish percent SoC and rely more on QC to >complete >> the trips that you otherwise would have needed a full charge for? >> >> 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 XoIP: +31877841130 >> Tel: +1 408 383 7626 Tel: +91 (040)23117400 x203 >> >> >> >> -----Original Message----- >> From: EV on behalf of Michael Ross via EV >> Sent: Sat 3/28/2015 10:53 AM >> To: David Rees; Electric Vehicle Discussion List >> Subject: Re: [EVDL] EVLN: LEAF EV Pack Reliability Outperforms Cynics >& >> Critics (?) >> >> Yes, the rate of charge is not a problem, it is being fully charged >AND too >> hot. >> >> https://www.youtube.com/watch?v=pxP0Cu00sZs >> >> On Sat, Mar 28, 2015 at 2:06 AM, David Rees via EV ><[email protected]> >> wrote: >> >> > On Fri, Mar 27, 2015 at 5:43 AM, Paul Dove via EV ><[email protected]> >> > wrote: >> > > Well that just verifies what I said. You have no data other than >coming >> > from >> > > the Leaf instruments. If it calculates capacity incorrectly it >will >> shut >> > down the car. >> > > You still don't know if the battery failed or the capacity >measurement >> > is off. >> > > One would have to measure voltage and amp hours to really know >what is >> > happening >> > >> > It's pretty easy to verify pack voltage using LeafSpy or LeafDD or >> > similar tools. I've verified that my LEAF is down close to 25% >after >> > almost 4 years and almost 40k miles in southern California. >> > >> > That said, the INL (Idaho National Laboratory) tested four 2012 >LEAFs >> > in Arizona over a period of about 2 years and 50,000 miles - two >were >> > only charged on L2, the other two were only charged using DC QC. >> > >> > http://avt.inl.gov/fsev.shtml >> > http://avt.inl.gov/pdf/energystorage/DCFC_Study_FactSheet_50k.pdf >> > >> > Battery capacity was verified by pulling the packs and measuring >> > capacity using a defined test protocol. >> > >> > While the DC QC cars fared slightly worse, at the end of 50k miles >the >> > L2 charged cars had lost almost 25% of their capacity and the QCed >> > cars lost about 27% of their capacity. >> > >> > So yeah - the 2011-2012 LEAFs definitely lose capacity fast, >> > especially in hot climates. The good news is that frequent QC >doesn't >> > appear to significantly change your rate of capacity loss unless >you >> > use QC nearly exclusively. >> > >> > -Dave >> > _______________________________________________ >> > 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) >> > >> > >> >> >> -- >> 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) 585-6737 Land >> (919) 576-0824 <https://www.google.com/voice/b/0?pli=1#phones> Google >> Phone >> (919) 631-1451 Cell >> >> [email protected] >> <[email protected]> >> -------------- next part -------------- >> An HTML attachment was scrubbed... >> URL: < >> >http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20150328/6b95d1a1/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) >> >> >> >> -------------- next part -------------- >> A non-text attachment was scrubbed... >> Name: not available >> Type: application/ms-tnef >> Size: 5231 bytes >> Desc: not available >> URL: < >> >http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20150328/65acdebd/attachment.bin >> > >> _______________________________________________ >> 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)
