I checked the Project Sunroof link, and their analysis seems to have several flaws:
1. They assume that the solar system will completely eliminate your electric bill. Even if the system provided all of the electricity for your house, you will still have a bill from the electric company.
2. They provide no consideration for the time value of the initial money that you pay for the system, even though they do assume that the cost of electricity will increase every year.
3. They do not consider that, after 20 years, the solar system will be at it's life cycle end, which means that it will be almost worthless. But, if you invested the money instead of buying a solar system, you would still have your entire principal investment after the 20 years.
4. There is no cost for maintenance of the system for 20 years. And, there is no consideration of the cost to remove and re-install the panels when you replace your roof, which is an almost guaranteed cost in The Villages.
OP, I think it would be helpful if you could address these points for those considering a solar system.
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