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Last time I crunched the numbers a grid tied (no batteries) system that size cost arround $25,000.
For the area I live in figuring a 20 year life span the power the system would produce would cost $0.20/kwh, or about double what I pay now. Arizona gets a little more sun than we do so that would reduce the costs, and I think Arizona has some extra deductions that we didn't get when I last did my calculations.
Before you get on me about using 20 years for a life span, its not that I don't think the panels can last 20 years, but that the chances of something damaging the system in 20 years is pretty good, be it a freak hail storm, neighbors kids with rocks etc... so I use a conservative 20 years.
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