I was looking through some HF adds, and looked at their solar panels. Knowing very little about the technology, I was wondering, 2 different types of panels, some with all the stuff and other with no controllers and stuff, at the same rating and the same price almost. What is the difference, between them? Years ago we had a wind turbine set up at camp for nothing more than shyts and giggles that charged a 12 volt battery, why I have no idea, who set it up or why. It was damaged from a winter storm and scraped. But now I want to try something different, since the power company at camp is some what less than reliable any more. I know HF stuff might not be top shelf but a place to start, a learning curve if you will