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what is the peak sun-hours for detroit? Answered

I'm trying to determine return on investment for a PV system on my house in Ferndale, MI, a Detroit suburb. I need to better understand how much sunlight I can count on in a given year to determine if it's feasible to install a grid-tied PV system in place.

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This may be "too much information" (11 MB), but here is the link to actual data collected by NREL at numerous sites in the state of Michigan, including Detroit:
http://rredc.nrel.gov/solar/pubs/redbook/PDFs/MI.PDF

Good luck!