If you don't go the BMS route, does anyone make a good reliable instrument to monitor ~ 50 cells. You wouldn't think it would be that hard to make some visual display/meter/instrument/? that would let you keep an eye on 50 cells. That way, if you're concerned about a BMS and all the issues we've heard about, you could take it on yourself to monitor the cells.
Anything available out there that I'm missing ? Thanks; Dennis Elsberry, MO http://www.evalbum.com/1366 http://www.evalbum.com/3715 But suppose there is no BMS. Lithiums do not have the large resistance increase as they approach dead. The weakest cell keeps right on trying, right up to a few moments before it drops dead. At the 10.5v cutoff, you may have 3 cells at 3.1v, and one at 1.2v. The 1.2v cell's voltage won't bounce up to a "safe" voltage range. It has been seriously damaged, and won't recover. And without a BMS, you won't *know* you've damaged it, and may blithely keep using it, potentially leading to a fire! So that's the situation as I see it. When everything is fine, it works. When something goes wrong (like the cells wandering out of balance, or leaving the lights on, etc.), there is a risk of failure. If things go very wrong, the failure can be dramatic! -- For every complex problem, there is a solution that is simple, obvious, and wrong. -- H.L. Mencken -- Lee A. Hart, http://www.sunrise-ev.com/LeesEVs.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) _______________________________________________ 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)
