I thought I understood how to charge my 9 month old LiFeP04 but know I am doubting my process. So I will lay it out and see what feedback the battery gurus here can suggest.
I have 132 60AH batteries in 2P66S. So I am going to call this 66 batteries at 120AH. Specs call for 3.6 volts max, so 66 in serial is 237.7 volts. I don't want to push them so I set the max voltage at 231volts charge which brings me to approx 3.5 volts per battery. Now in real life once it is at this 231 volts for the string each individual battery voltage is approx 3.34 volts +/- 0.10 volt. Even at the plus side of that each battery would be 3.44 volts or 227.04 volts for the string. So how is it that my charger string voltage is reading 334 - 335 volts while each battery is reading 3.34? Does it matter if the total voltage is over the max (66 X 231) as long as the individual voltage is less 3.5 volts? Should I set my BMS charge voltage cutoff higher and just leave each cell set at the 3.5 volts max. Hope I am making sense. Thanks in advance for any feedback, Buddy Mills <mailto:[email protected]> [email protected] Look mom, no gas. <http://www.evalbum.com/2887> http://www.evalbum.com/2887 Disclaimer: No animals were harmed or killed in the process of writing this email. Any stories to the contrary are, for the most part, either fictional or greatly exaggerated. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20140925/1b323f2f/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)
