42 Design of solar photovoltaic systems; Providing a web site featuring technology that enables users to evaluate past electrical usage, measure a property's solar potential, develop an estimate of financial gain from installing solar, seek bids from a network of local contractors, assess financing options, and solicit financing; Quality evaluation for others in the field of maintenance, repair and installation of solar installations and photovoltaic installations; Research and development in the field of photovoltaic solar energy