I used to be in the business of renewable energy, but mostly photovoltaics. Getting off the grid is always a welcome move, but don't think for a minute you're doing anything "green". The amount of BTU's it takes to make and install the PV units will never be made up for in recouped energy production. The previous poster was correct. You would need a VERY sizable array, and even with the massive subsidies the state of CA provides, it's still not cheap. Most people that sought out solar were just sick of getting bent over by the energy companies and wanted to just give the finger to the man. Like the other poster said, in addition to the power inverter, the only way to store any excess power created during the day for use at night is with a battery bank, and obviously, they've got limitations, and are unsightly and cumbersome as well. As far as it goes regarding the sale of electricity back to the energy companies, I'm not sure what the regulations are these days. Back when I was still in that business, you had to produce a good deal of power to get reimbursed whatsoever, and had to get a permit that stated you were a "power producer". Believe me, CA leads the nation in every conceivable means of red tape. One of the main reasons I got the fuck out of it- that and county inspectors.