The Massachusetts Institute of Technology, MIT no less, actually offers access for free to a number of previously taught courses on various topics including several that related to the solar or clean energy industry. The program is called MIT Open Course Ware ( OCW ). OCW is open and available to the world and is a permanent MIT activity.
However if feel you have the background, it is free.
Dick K.P. Yue, Professor, MIT School of Engineering
The idea is simple: to publish all of our course materials online and make them widely available to everyone.
There are lots of other courses available for free from MIT so check it out.