Excellent fundamentals course on EETimes by Jon Donovan, Editor/Publisher of Low-Power Design and Low-Power Wireless at http://www.eetimes.com/electrical-engineers/education-training/courses/4210397/Fundamentals-of-Solar--Grid-Connected?isredirect=true. Good overview with solid technical depth. In interest of transparency, it is TI-sponsored but it is not about TI.
