The northern part of the United States, as Figure 8.2shows, has a yearly 24-hour average solar insolation thatis typical of the average value worldwide. Using thisworldwide average, consider the economics of aphotovoltaic installation. If the photovoltaic efficiency is20% and a payback period of 3 years is expected(exclusive of the cost recovery factor), what is themaximum acceptable installation cost per W? Assumeelectricity costs $0.10 per kWh. Figure 8.2.150 W/m2170 W/m2150 W/m2190 W/m2245 W/m2225 W/m2-U.S. Department of EnergyYearly 24-hour averages of insolation on a horizontal surface for the United States.

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