Hi Woody. I see no one has chimed in...
I guess there is the heat cable you bury to aid plant growth...whatever they are called. Theses have the thermostat built in and keep things around that 70 to 75 F mark I think. There are also the Farnam heating pads that seem to work for people. There are some 12 volt ones also that are made with adhesive to stick on RV water tanks. These are really nice if you go 12 volt. They are apparently also available in 120 volt apparently. I have a 12 volt one if you want a pic of it. I just bought it out of interest. It was at Princess Auto for $12 or something like that. One question that should be asked is.... do they want to heat just when parked....as in from the wall power? ...or heat whenever required when driving... in this case it could be 12 volt if battery and DC/DC were adequate...or some of the ones designed for AC could take pack voltage DC depending on what it is... some testing may be required here. Yes, insulate the boxes with covers to be removed in summer months. Some have talked about heating blankets...but I would be careful with this one... .perhaps too fragile.
Edit...to answer your question...70 to 75 F is a great temp for best performance and not shortening life of battery... (most important with AGM's)... Anything above 60 is pretty good.
Anyways, just thought I would chime in.
Also, just parking inside with some heat goes a long ways as they don't cool down too quick when in use.
Edit...to answer your question...70 to 75 F is a great temp for best performance and not shortening life of battery... (most important with AGM's)... Anything above 60 is pretty good.
Anyways, just thought I would chime in.
Also, just parking inside with some heat goes a long ways as they don't cool down too quick when in use.