[bbradley406]

Off the grid cabins frequently use a hybrid setup, where a (typically) propane generator refills the batteries during extreme load or whenever they dip below n%. It's handled by a smart system that can optimize for house temperature, minimum propane or electricity used, etc.

This works very well because you rarely need it and propane has a fixed, predictable cost. Unfortunately, it doesn't work in CA due to their rules about generators.