I am currently taking an online course called Solar Energy. By the end, I'm supposed to know enough to design a photovoltaic system for the JayBee.
The course syllabus estimates that the coursework will take roughly eight hours a week to complete. I have already spent more time than that, and I'm only halfway through the material for the first week! I also roped my son into helping me understand some of the practice questions. Maybe not strong harbingers of future success, but at least I am enjoying it so far.