How long will single battery last with heater running?

philh wrote:
We may have our first opportunity to dry camp mid winter for one night. Do I stand a chance of surviving on a single deep cycle 12V battery, or should I just plan on buying my first i2000?

Maybe you should instead pass on the opportunity and winterize your unit instead, and step into cold weather camping gradually. A lot can depend on the weather forecast for the night you choose to camp overnight, so there is no good answer, unless you subscribe to the Boy Scout Theory of Be Prepared, for anything, which could get expensive.