I find these chatty video presentations annoying. I'd rather read. But I sat through this one, and got a few bits of useful info out of it.
1. You need a BMS that properly prevents over-discharge. Hardy murdered six 2000-cycle Headway LiFePO4 cells in 226 cycles (~11% of rated life) because his test gear didn't properly shut down the entire load (including its own) when the first cell dropped below 2 volts. 2. A simple standalone shunt regulator board might be no better, or even worse, than no BMS at all. This is especially likely to be the case if you're cycling your cells in open air in your house or garage, where they're all the same temperature; instead of in an EV's battery, where they aren't. 3. It's probably not a great idea to go on a trip and leave your battery test jig running unsupervised for days or weeks. 4. I see why they call this "EVTV." It's a lot like television, and not at all like peer-reviewed publications. 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)
