This is pretty awesome! I can't imagine getting 10 years of power from one battery. I am guessing if you live off grid though you probably are pretty good at conserving and I doubt you aren't just blindly blowing through energy. My friend has some property with a cottage and other buildings in the UP of Michigan. He doesn't have any power, but he uses generators occasionally. This would totally be a game changer for him up there if he could keep it from getting stolen during the times he wasn't up there :)