Labor costs in solar can be ridiculous, as there is little consumer's education and no uniformity in parts and layouts. With things like residential plumbing or electrical, a Home Depot clerk will tell you what you need to buy and the instructions will tell you the rest. With solar, installers make it look like an art beyond humble capabilities of an average Joe, and charge accordingly. It is indeed TAD more complicated - and less precise - than a shore electrical, but not much.
Germany is waay ahead of us in renewables and many other things. Not only they have a lower ratio of administrators to laborers than in the US so there is no inflated overhead, but they also have very smart government programs for solar. Solar is subsidized at the expense of higher electricity rates, and citizens don't mind because they understand the necessity. As a result, Germany is getting 20% of its peak power supply from solar, VS 2% in sunny California. Their solar manufacturing is booming, everybody is covering roof with solar and making extra cash for selling energy into the grid, farmers are installing panels on elevated racks in their fields and getting extra cash too. Germany plans to make 30% of annual energy out of renewable sources by the year 2020, if I'm correct.