Photovoltaics - Basic 

Photovoltaics is an energy source. Light shines on a crystal and produces electricity. Sunlight is free, abundant and widely distributed, available to every country and person in the world. The many advantages of photovoltaics lend itself to being the ultimate energy source. 

This course is an electronic book on PV. It can be read from start to finish as a course on photovoltaics.