In recent years, the U.S. solar photovoltaic system costs continue to fall, the residential and commercial facilities installation cost of pv systems from 1998 in each tile $11, fell to $6.2 in 2010, but "the components cost" (including labor cost, inverter, etc) still restrict the photovoltaic system of mass popularization applications. Recently, the energy department announced plans to launch a new research project, and support the development of scientific research institutions plug and play of the solar system technology, improve the users' install and use ability, reduce the residential and commercial facilities photovoltaic system of "the component," cost, and speed up the distributed photovoltaic system application.home solar...