information on solar irradiation
You can find some excellent information on how much sun is available in different parts of the country by visiting this website.
[Get Solar Radiation Data]
Online Estimation Tool
This website will perform many of the calculations taught on this website, for free in a simple to use form that you complete with your information.
It's a little more convincing to do the calculations yourself, but many of the methods of estimating your home's potential for solar electricity are used by this calculator.
[Enter the PV Watts Calculator Page]
The Line/Load Blog helps explain how to use this data for the purpose of developing your own estimates for solar productivity in your home.
Other Works Referenced