I have a friend that lives off the grid. He has large battery banks, solar panels, and propane powered generators. He put a wind generator in a couple of years ago to help supplement the solar. He lives on a "knob" in a valley, and a 50 foot tower was all he had. Wind gives him a 100-300 amp hours a day, and I don't think he spent very much for the used unit, and tower. The reason he lives off grid, is that it would cost him more than 60K to have power delivered, he is 70, and the wife in the late 60's. It is their retirement place, and he is worried about the wife not having power after he is gone.