pianotuna wrote:
adamis,
Starting with the RV at -30 in storage, how do you plan on heating the batteries up? You can't draw much current from them, so you can't run the furnace. It is a fail. You could run a generator, but DAMHIK that may not work too well. Shore power would work running an electric heater.
There is a good solution which doesn't involve Li, which is cheaper unless you wish to "roll your own" Li.
Or more accurately, even though "you" personally want your rig "camp-able" at -30 deg and colder, LiFe's still have issues below freezing and you can't just "turn on he furnace" as one person suggested, although they will still "work" to discharge, IE provide power down to well below freezing (Not -30, someone can look it up though ). It's charging when the batteries themselves are around or below freezing.
Bottom line, they are a great option for lightweight, and duty cycle for warm weather campers. Not worth fiddling with if one is winter camping.
Although it appears some folks (on rvnet here anyway) really enjoy engineering and maintaining "off grid" solutions. I wonder if the "maintenance free" aspect of LiFe's is lost on the added $ and effort to make them work though.