Someone posted a link to batteryuniversity.com on the Elec-trak list. I glanced at the site and the first page I checked was this one
http://batteryuniversity.com/learn/article/charging_the_lead_acid_battery where it says "Lead acid is sluggish and cannot be charged as quickly as other battery systems." News to me! From what I know, as long as you stay below 80% SOC and monitor temperature, you can charge an AGM battery about as fast as you can discharge it - and that's easily thousands of amps. Sluggish? I don't think so. The same page also describes a basic 3-stage algorithm (bulk, finish, float) as if it were the only way to charge a lead battery. They ignore constant voltage charging and DV/DT. Finally, this page's author states that "Measuring the open circuit voltage (OCV) while in storage provides a reliable indication as to the state-of- charge of the battery." Not in my experience, and not according to Nawaz Qureshi, Vice President of Engineering, USBMC, who says "Voltage is not an accurate indicator of state of charge." http://evdl.org/pages/socvolts.html If I'm barely qualified to judge what's written there about lead batteries, I'm TOTALLY unqualified to judge the value of their documentation on lithium batteries. What say you battery experts? How much of batteryuniversity.com is useful, and how much is bogus? David Roden EVDL Administrator http://www.evdl.org/ _______________________________________________ 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)
