I found this great article titled "Economics of Solar Electric Systems for Consumers: Payback and other Financial Tests" by Andy Black, July 2009. Mr. Black is a solar financial analyst and CEO of OnGrid.net.
If you are interested in gaining a more in-depth knowledge of why solar makes financial sense, I think this article does a great job. It's quite comprehensive and covers system performance, electric rates, incentives and financial returns.
If you want a quick snapshot approximation of what kind of returns/payback you can expect, refer to Figure 14 on page 15 in Mr. Black's article. There are various case examples for 12 states. For some states, there are high usage and low usage examples. The returns are much better for high electricity usage customers since they are paying big premiums for Tier 3-5 electric rates. I like the Lifecycle Payback Ratio - it's nice and simple and tells you how many times over in savings you can expect to receive for the cost of installing the system.
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