You can charge at that very low temperature, but at a very low rate according the specifications of my Li Ion Graphite cells.
My first EV came with two batteries, a 40 cell and a 50 cell 300 ah lead cobalt battery that had a 1/4 inch thick aluminum case that was 20 inches high in this high country in Montana, the lowest temperature my EV was at -41 F at work at a elevation of 3600 ft at work. I just kept a very low maintainer charge for about 8 hours. I was always the first one out of the parking lot driving through a foot of snow while all the other ICE's had trouble starting. I also added a electric battery blanket which is normally use for 12 and 24 volt batteries. You can get these blankets at any auto part store. The one I use was made by KAT's which was about 12 inches wide and 60 inches long for the larger batteries. Wrap two blankets around each battery. The wattage rating was about 80 watts for the smaller batteries and 160 watts for the larger battery. It was recommended not to block the bottom of the battery, because the battery containers would frost up from any heat the batteries give off which cause the outside surfaces to condensate. The grommet holes in the bottom of the heater blanket allows the water to flow out. Roland ----- Original Message ----- From: Danpatgal via EV<mailto:[email protected]> To: [email protected]<mailto:[email protected]> Sent: Wednesday, February 25, 2015 11:18 AM Subject: Re: [EVDL] Cold Charging Lithium Experiences Electric Vehicle Discussion List mailing list wrote > An example is Powerstream > Batteries <http://www.powerstream.com/LLLF.htm> show in their > specifications charge down to -40 C. I just looked at that, and I read the charge temperature range to be from 0 C to 40 C. Am I reading that wrong. I just checked the CALB (LiFePO4) specifications I have, and they state charging is allowed from 0 C to 45 C. Spring can't come soon enough. ----- Dan Gallagher http://www.evalbum.com/3854<http://www.evalbum.com/3854> -- View this message in context: http://electric-vehicle-discussion-list.413529.n4.nabble.com/Cold-Charging-Lithium-Experiences-tp4667675p4673967.html<http://electric-vehicle-discussion-list.413529.n4.nabble.com/Cold-Charging-Lithium-Experiences-tp4667675p4673967.html> Sent from the Electric Vehicle Discussion List mailing list archive at Nabble.com. _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub<http://www.evdl.org/help/index.html#usub> http://lists.evdl.org/listinfo.cgi/ev-evdl.org<http://lists.evdl.org/listinfo.cgi/ev-evdl.org> For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA<http://groups.yahoo.com/group/NEDRA>) -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20150225/b6576b34/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)
