New York Times: MOVE over, Joe the Plumber. Spencer the Solar Panel Installer is here. In this case, it`s Spencer Bockus, who created solar-powered fans and other contraptions for science fairs as a fifth grader in California. Today, at 22, he is on customers` roofs, measuring where the shade will hit and hooking up photovoltaic arrays, better known as solar panels, to convert the sun`s energy into electricity. ‘Sometimes I`m 50 feet up on a steep roof and it`s so hot the tar is melting onto …