I did a few photovoltaic systems for a contractor last year. The contracts were subbed out from Home Depot who in turn have a deal with British Petroleum.
In a few words... they are a PITA to install, unless you enjoy working on heavily slanted rooftops and tight time schedules The backyard-mounted types were pretty good. As far as profit goes, like anything else, they're hit or miss.
I believe the (1) year experience requirement can be waived by attending a seminar or two. I think manufacturers are desperate for installers so they want you to get qualified as soon as possible if you're interested.