Rich is pretty well right on this (among the others). The thing about solar is that it's seldom as easy as buying an off-the-rack suit and having it altered to your dimensions. Since usage is different, locations vary, and roof real estate has to be dealt with, one size does not fit all or even a single customer. The other insidious thing is that when you get some solar charging, there always seems to be something else that can be powered with the sun.
At least do a bit of research so you're comfortable with the way things work.