Hi Michael, Fortunately in the U.K. it never gets that hot!!!
I've got 25 160Ah Thundersky in series. I believe they're 3.3 nominal and online it says not to charge over 4V. But I'm never certain about that. Thanks, Matthew Sent from my iPhone > On 7 Aug 2017, at 12:59, Michael Ross <[email protected]> wrote: > > The surest way to destroy a pack of LFP cells is to fully charge them and let > then get hot as in over 100F. > > Can you tell us the number of cells and their parallel series configuration? > Then specific recs can be made. > > You may want to consider cutting of charging before fully charged state is > reached and never let them sit in a hot place if you have charged them to a > high SOC. > > The problem is the positive electrode becomes very reactive with the > electrolyte when fully charged and temperature sets off a destructive process. > > I speak from experience, but also researching it. There is a long and > interesting video on YouTube of professor Jeff Dahn a long time battery's > researcher, discussing his. Try searching Jeff Dahn Waterloo lithium or > similar. It was a lecture he gave at Waterloo University. Dahn is an > electrochemistry at Dalhousie University in Novelty Scotia. > >> On Aug 7, 2017 3:00 AM, "Matthew Quitter via EV" <[email protected]> wrote: >> Thanks guys... but if the charger is turning off at a fixed voltage how do I >> get more power into the pack? >> >> >> > On 7 Aug 2017, at 05:02, Bill Dube via EV <[email protected]> wrote: >> > >> > I agree. Voltage on LFP cells is useless for determining the SOC. >> > The voltage is very constant except at near 100% SOC and at 0% SOC. >> > You really need information about the middle, and voltage doesn't give any >> > clue about that. >> > >> > You need to count the amp-hours, like with an E-meter or a Cycle-Analyst. >> > >> > Bill D. >> > >> >> On 8/6/2017 7:00 PM, Willie via EV wrote: >> >> >> >> >> >>> On 08/06/2017 07:38 PM, Matthew Quitter via EV wrote: >> >>> Hi Guys, >> >>> >> >>> My 1238-6501 Curtis controller gives very different SOC % for similar >> >>> voltages. >> >>> >> >>> For example I've recorded a pack voltage of 82.2 and had the Curtis show >> >>> 22%, 31%, 43%. >> >>> >> >>> The pack is made up of 25 Thundersky 160Ah batteries. >> >> >> >> With LFP cells, you can't accurately infer SOC from voltages in the >> >> middle of the range. The voltage/SOC curve is too flat. >> >> _______________________________________________ >> >> 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) >> >> >> >> >> > >> > _______________________________________________ >> > 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) >> > >> _______________________________________________ >> 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) >> -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20170807/b37bffbc/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)
