This is an OLD thread and I'm surprised I ran across it...but it still made me think. So here's my thoughts. Years ago I sat all night long in a hospital working the night shifts. I was watching YouTube videos on how to become more self sufficient by using rain barrel water collection systems, growing gardens for food, chickens for eggs and meat, etc. As I started to learn about solar power and using solar panels to charge a battery bank...then run my home off of the battery bank instead of paying the electric company for my electricity, it occurred to me: Why can't I sneak a car battery into work every night and plug a charger on it, with juice coming from the hospital? I worked all by myself in a department way back in the back of the hospital. Nobody would ever know. Each shift I could bring a different battery and charge it up on my 12 hour shift. Then take it back home and use the power. That is how I figured I would save money on my utility bill. I never ended up doing it...but somebody could.