Photomike wrote:
I was planning on doing the same thing then thought again about it that it was just another battery to monitor so I did not run it dead at -30.
To bad you could not get it to pull from the camper battery, yes another phantom draw but at least if you had 12v in the camper the thermostat would still work.
On Edit: That one may be able to run with power from the camper if that is what the C is for.
I keep an assortment of batteries in the TC, so I'm not concerned if the two AA batteries need replaced in the thermostat. I will say that I would definitely hook it up to the existing 12V system had there been a third wire in the wall.