Hi Folk's,A123 told me to float charge their D size cells to 3.45V when I was using them in a float charge UPS application.Best Regards,markwww.REEVA.info Message: 9 Date: Thu, 14 Feb 2013 22:33:53 -0800 From: "Cor van de Water" <[email protected]> To: "Electric Vehicle Discussion List" <[email protected]>, "Electric Vehicle Discussion List" <[email protected]> Subject: Re: [EVDL] 12V LiFePO4 batteries Message-ID: <[email protected]> Content-Type: text/plain; charset="iso-8859-1"
Since the cells might not be perfectly balanced, I would expect that when one cell dips to 2V, you can expect the others still to be around 3V, so I guess that it would be prudent to disconnect when the voltage dips to 11V (3x3+2) BTW, I did not suggest to float-charge the cells at 3.45V indefinitely, since no car is running 24/7. Typically a car is used a short period, sometimes a few hours, and then shut down, from which moment the battery is slowly discharged until the car has been started again. I believe the highest current in a (ICE) car is starting cold. That can run close to 1000A peak. Because AFAIK most alternators are in the 100A region, but it is certainly good to check for max charging current and adjust for it. NOTE that the net charging current is the difference between the alternator's generated current and the consumption of the car. Regards, Cor van de Water Chief Scientist Proxim Wireless Corporation http://www.proxim.com Email: [email protected] Private: http://www.cvandewater.com Skype: cor_van_de_water XoIP: +31877841130 Tel: +1 408 383 7626 Tel: +91 (040)23117400 x203 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20130219/cbf00a48/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)
