what is the peak sun-hours for detroit?

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.

jj378 years ago
here are a few link for help with solar power.

Solar Calculator
Solar Power Rebates

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:

Good luck!