I did an online calculation for my house last year, using solar-estimate.org. The results showed that the upfront cost, after the 30 percent tax credit, would be $12,489. This amount is supposed to be an average cost from four local solar contractors. The payback period is 16 years, and the total life cycle energy cost savings over 25 years would be $4,647. But, they did not include any potential investment return that I would forfeit by not being able to invest my $12,489. They also did not include any repair, maintenance, or insurance costs. So, I cannot see how a solar system would make financial sense for my house.
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