Sungevity is a company that does residential solar panel installations. They have this cool web app that lets you enter you address and then determines how much energy you will need. They use satellite imagery to help design the system.
When you’re ready to see how much solar your home needs, Sungevity makes it easy. Simply enter your address, and we’ll design a system for your roof remotely, using satellite images. We’ll get back to you with the systems that will fit on your roof – all online and free.
Pretty cool, but unfortunately it is for California residents only.