I will be parking a trailer out to my Colorado mountain property in the spring after the snow melts. It gets quite cold with the risk of freezing at night late into spring so I plan to use water jugs until the freezing risk passes. I will be adding electricity later in the season and was thinking that in the meantime I might be able to run the furnace off of a freshly recharged battery for a weekend jaunt. Will a good battery run a furnace for a couple of nights?