The short answer is that payback times can vary from state-to-state. You can be looking at as little as five years, and as many as 45 years. Payback rates are dependent on location (ie: because of the amount of sunlight available for solar power production), size of solar panels and initial investment. There is some information at the link provided below.
The second link below seems to provide some of the information you are looking for, but I found it really difficult to decipher.
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