The northern part of the United States, as Figure 8.2 shows, has a yearly 24-
hour average solar insolation which is typical of the average value worldwide. Using this worldwide average, consider the economics of a photovoltaic installation. If the photovoltaic efficiency is $20 \%$ and a payback period of 3 years is expected (exclusive of the cost recovery factor), what is the maximum acceptable installation cost per W. Assume electricity costs $\$ 0.10$ per $\mathrm { kWh }$.

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The Answer of The northern part of the United States, as Figure 8.2 shows, has a yearly 24-
hour average solar insolation which is typical of the average value worldwide. Using this worldwide average, consider the economics of a photovoltaic installation. If the photovoltaic efficiency is $20 \%$ and a payback period of 3 years is expected (exclusive of the cost recovery factor), what is the maximum acceptable installation cost per W. Assume electricity costs $\$ 0.10$ per $\mathrm { kWh }$.

The Northern Part of the United States, as Figure 8 20%20 \%20%

The Northern Part of the United States, as Figure 8 $20 \%$