120°F is high for PbSO4 isn't it? I always heard to keep the temp during charging below 100°F.
There is a JLD temperature controller at around $30 on amazon, or at least that is what I paid a couple years ago. JLD612 if memory serves. Same weird passwords and parameter entry, does PID contorl. Seems to last OK for so cheap. You need a thermocouple. Which you can make from a thermocouple wire with a solder and a torch. I braze mine with phos bronze, but it is a little tricky. I have been thinking about pipe tape for this...with a controller. You could weave a length of pipe tape among the cells, or fix it to a plate of aluminum. On Fri, Jan 10, 2014 at 11:55 AM, Zeke Yewdall <[email protected]> wrote: > How about the heating matts for greenhouses.... they are designed to have > dirty pots of plants put on top of them, and water and all. They seem to > limit to about 120F even when sandwiched between foam insulation, and look > fairly robust... about 15 watts per square foot, so not too much power.... > I'm thinking about doing them for the EV bug conversion when I put the > lithium batteries in. It's not a wintertime car anyway -- not having any > defrost or heat either, but I'm thinking of days when it's 50's and sunny > during the day, but still dropping down into the low 20's at night -- when > it would be charging. The BMS will turn the charger off if the battery > temp is too cold, but it would be nice to be possible to charge then. > > > > On Fri, Jan 10, 2014 at 1:18 AM, Martin WINLOW <[email protected]> wrote: > > > This issue is one of the advantages of using an electric (bed-type) > > blanket as the fluffy material the heating wires are sandwiched in - in > > combination with a flat tray floor and protective, relatively hard layer > > between blanket and cell bottoms - avoids point load problems that might > > lead to damage to the heating wires. MW > > > > > > On 9 Jan 2014, at 17:53, tomw wrote: > > > > > Kevin, > > > > > > If you tape the heaters to bottom side of aluminum sheet like I did, I > > think > > > it is a good idea to put two or three layers of a tough tape like > Kapton > > > over the place where the leads are riveted. Over time the weight of > the > > > batteries may cause those slightly raised riveted leads to punch > through > > the > > > insulating layers on the heater causing a short between them via the > > > aluminum. Nothing catastrophic, the fuse will blow, but a pain to pull > > the > > > batteries to replace it. The somewhat soft insulation underneath the > > heater > > > helps prevent it too - heaters pressing down into it. You might also > > search > > > on diyelectriccar on battery heating. Been a lot posted there over the > > last > > > several years. Some have used the thin film resistive heaters that are > > used > > > for radiant floor heating for example. You can purchase it by the > foot. > > > The Farnums are just one option. Taping to an aluminum pan that fits > > snugly > > > in the box helps spread the heat as well as protect the heaters. > > > > > > > _______________________________________________ > > 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) > > > > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20140110/b1fef1cf/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) > > -- Put this question to yourself: should I use everyone else to attain happiness, or should I help others gain happiness? *Dalai Lama * Tell me what it is you plan to do With your one wild and precious life? Mary Oliver, "The summer day." To invent, you need a good imagination and a pile of junk. Thomas A. Edison<http://www.brainyquote.com/quotes/quotes/t/thomasaed125362.html> A public-opinion poll is no substitute for thought. *Warren Buffet* Michael E. Ross (919) 550-2430 Land (919) 576-0824 <https://www.google.com/voice/b/0?pli=1#phones> Google Phone (919) 631-1451 Cell (919) 513-0418 Desk [email protected] <[email protected]> -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20140110/0590a49b/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)
