Hot Water and Warm Homes
from Sunlight:

This great Teachers Guide is available at Amazon.com.

The guide focuses on designing well controlled experiments. The first experiment involves building a model house, and determining the best way to heat it with the sun. The second investigates how best to heat hot water.

Home Made Energy:

Journeyman Electrician Bill Ford designed this program for the home hobbyist who wants to save money by building his or her own solar power panels and/or windmill. It would be perfect for a science fair or as a group project.

After watching the videos and reading through the manual, you should be able to build and install a solar panel or windmill in just one weekend.

I strongly urge you to check this out.
It has a 60-day money-back guarantee.