I use a Lasko 200 watt all plastic heater that I got from either ACE Hardware or Wal Mart. My Li Ion modules are space 1/4 inch apart and each bank of modules are space 2.5 inches from the battery box walls and 5 inches from each bank of modules in my insulated battery box like streets and avenues. The modules are place on a steel galvanize plate on a 1/2 thick insulated fiber board.
The heater with a built in fan is place on the outside perimeter of the modules and between the battery box wall. The heater blows heat around the perimeter and then returns back to the fan. About 30 minutes before I leave, with the outside ambient air temperature of 30 F degrees, this heater will heat up the batteries to as high as 80F. I also have a 600 watt cab heater that can heat up the passenger apartment to 80F in with 30 minutes. Roland ----- Original Message ----- From: Danpatgal via EV<mailto:[email protected]> To: [email protected]<mailto:[email protected]> Sent: Friday, February 20, 2015 1:25 PM Subject: Re: [EVDL] Cold Charging Lithium Experiences Reviving this thread as we're having another very cold stretch here in the Eastern US. My batteries (SE130 CALBs) are still going, but boy do they sag when it's cold like this. It's annoying. I've been charging when my BMS sensors (atop each cell) are over 0C, which they have generally remained over the past few weeks despite the cold (thankfully my garage generally stays above 0C). But, my follow-up question on all this is if the BMS measurement is good enough. For example, I guess there is resistive heat that gets generated upon charge/discharge/shunting that probably make the sensors read higher than the cells themselves. How much, I don't know. Does anybody have any thoughts, experience on this? We've gotten down to -20C with a HIGH today of only -10C ... yet I'm charging. I didn't really want to do it, but I was dragging so much on the road with low SOC%, I had to, or risk having to really limp home. ----- 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-tp4667675p4673895.html<http://electric-vehicle-discussion-list.413529.n4.nabble.com/Cold-Charging-Lithium-Experiences-tp4667675p4673895.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/20150220/b30231ab/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)
