I think Cor noted that 100% on the Leaf instrumentation was more like 93% not 80%. Why would you need a 80% mode if when the instrumentation shows 100% it's at 80%? He noted that when 100% is indicated the cells are at 4.12V on the leaf spy which is higher than 80%. And when at 80% it's 4.05V. That makes sense according to the battery university BU 808 how to prolong lithium based batteries. So according to their article you'd get twice the cycles stopping at 4.0V vs 4.1V. The manufacturer should design the final 100% taper charge not to overcharge the cells or reduce life. If more watt hours are needed then just move to a larger battery instead of stress a smaller one. The charger I made for my Ghia stops at 3.6V with LiFePO4 chemistry ok for the last 45k miles. NMC that's in the Leaf Smart iMiev tapers higher but the charger in any EV should be designed not to overcharge the cells and set for maxim longevity without the customer having to fuss over it. Just my 2 watts. Mark
Sent from my iPhone > On Oct 6, 2016, at 10:38 AM, Thos True <[email protected]> wrote: > > Rush and All, > > I agree that the information can be quite confusing. I tried my best to make > it clear that what the engineer told me. > It was that 0% on the instrumentation is about 20% in the pack, and that 100% > on the instrumentation is about 80% in the pack. Thjis was the best that they > could do to remove the customer error factor in the charging protocol. > If you charge it to 80% per the instrumentation, it will not hurt your pack, > but you will of course experience lower range because you are not charging to > the full potential. > > Hope this helps to clear things up some, > > -Tom > > >> On Wed, Oct 5, 2016 at 1:34 PM, Mark Hanson via EV <[email protected]> wrote: >> Thanks folks >> >> So if the Leaf charges at the 100% setting to 4.12vpc and 80% to 4.05vpc and >> battery university says max life of 2k cycles is at 4.00vpc then I should >> change my charge cut off at 80% for daily short trips of 15 miles typical. >> Plus since balancing occurs all the time there's no need to charge at 100% >> except for long trips >> Best regards >> Mark >> Sent from my iPhone >> _______________________________________________ >> UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub >> http://lists.evdl.org/listinfo.cgi/ev-evdl.org >> Read EVAngel's EV News at http://evdl.org/evln/ >> Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA) > > > > -- > Remember, it is not that the glass is half empty, in reality, the glass is > merely twice the size that it needs to be! -TNT'82 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20161006/4c3b9335/attachment.htm> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
