I am programming the BMS, and am wondering what opinions people have on the sepoints for the BMS, specifically for discharging.
24 CALB cells, 100AH, Alltrax 450 controller, DC6.7" motor, 1973 VW bug. Elithion Lithiumate Lite BMS. I did the first serious road test this morning, Default setttings were 100A continous, and 300A peak for the BMS to start regulating. 2.9 volt was the low voltage cutoff, with 2.5 volts being the drop dead voltage. It was doing pretty good for about 15 miles (60AH or so). It would cut out under hard acceleration (380 amps or so) and kill the power to the controller. Under sustained uphill (200 amps or so) it would also cut out after a while, and would also engage the throttle limiting to keep it to 100A or so. I would like to set it to 150A continuous, but not sure if this risks damaging the battery. It's going to live in a much flatter place than I was doing the test, so maybe 100A is okay. The big problems started about 18 miles in -- one battery started going under 2.9 volts under accelleration, and by 19 miles in, it was severely limiting current to keep it above 2.7 volts or so -- went to only about 30 amps, which was essentially undriveable. I either have one cell badly out of balance (what I'm hoping for), or that's only got about 70AH capacity instead of 100. If I can correct this one cell and bring it up to what all the others are doing, am I safe in raising the current limits a little, if I keep the voltage controls the same? Opinions? Thanks Zeke -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20140729/06c8ee17/attachment.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)
