I found an interesting Solar Power Calculator on the web.
It provides a way for you to enter your location, your energy usage, and calculates the cost of a solar system, including all the State and Federal tax incentives!
Make sure that you update your electricity usage based on your current cost per kilowatt-hour.
The default value in the web form is 8 cents per kilowatt-hour. This was the national average for electricity a couple years ago and electricity rates have been rising rapidly in the last couple years.
Another parameter you might want to change is the expected percentage rate that electricity will increase each year.
The default number in the form is 3%.
In Massachusetts we've been averaging 10% over the last 10 years....
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