SUCCESS OF PHOTOVOLTAIC HOMES IN THE PIEDMONT PROVINCE OF EASTERN VIRGINIA

The success of alternate energy systems depends largely on the topography, location and climate of the installation sites. Our research organization (Center of Basic and Applied Science - CBAS, INC) has examined the success of these systems, and in particular how the economics of the systems were determined by decisions made during the system installations. In the case of photovoltaic (PV) systems, we concentrated on 20 installations in northern Virginia. The local topography formed on early-middle Paleozoic metamorphic rocks, today seen as a rolling terrane on which a resurgence of forests over the past century shades most homes. Some years after home completion, 1-3 kilowatt PV systems were installed, usually with batteries for emergency power. The PV systems typically cost about $20,000, provide about 30-50% of the electrical use, and caused the meter to spin backwards (returns electricity to the power company) a few hours/day. Half of the PV paanels were roof mounted and half were pedestal or ground mounted. Many home owners had other "green" technology (hybrid cars, water-saving plumbing, extra insulation, rain barrels, etc.). Most owners seemed more interested in experimenting than saving money; most estimated that their savings on the electrical bill would never pay for their PV installation.