You need a sunny roof to benefit from solar panels, but yours may be sunnier than you think. Google’s Project Sunroof gives building-by-building details, and now has data for (parts of) all 50 states.
Search for your house, and take a look: sunny spots are in yellow, shady ones in purple. Google also provides estimates of how many hours of sunlight your roof sees, how much area is available for solar panels, and how much a solar panel installation could save you over the years. It also has details on financing and more. That makes it a great place to start thinking about whether it makes sense to install solar panels.
Source/More: Google’s Project Sunroof