Don't forget to check what your local, state laws are concerning "alternative" energy. Where I'm at ALL alternative energy(read solar, wind) MUST be grid tied. I am still trying to find the email of a company out of Livonia that does "portable" generator/converters for the Army. A "portable" doesn't have to be grid-tied and what I remember from the show I went to they have units that can be added on to increase the amount of energy produced and still not be grid tied. Just learned from my brother they are required to be grid tied in NV as well and the electric company is dragging their feet on the converters for the solar panels they installed.Bro says it's because they don't want to pay the customer for the excess electricity.