Energysage
Solar panel calculator to quickly estimate your solar potential and savings by address. Estimates are based on your roof, electricity bill, and actual offers in your area.
Solar-estimate.org
Web-based solar cost and savings estimator that gives a rough idea of the solar potential of your home before deciding if you want to talk to a solar company.
Project Sunroof
Your own personalized solar savings estimator, powered by Google Earth imagery.