Is this the sort of thing you're considering? As a normal solar pv set up outputs 4kW (max permissible in a domestic setting I think) the cost/benefit ratio of your idea stacks nicely. And a lot less of an eyesore than solar panels. It'll be interesting to see how you get on.
https://i.ebayimg.com/images/g/g4UAA...2is/s-l400.jpg