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)
