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Average system costs = $95 per square foot. Average solar panel output = 10.6 watts per square foot. Average solar energy system costs = $8.95 per watt. In order to compare the solar energy costs to conventional hydrocarbon fuels, we must covert the $8.95 per into KWH.
The average solar energy system size in the U.S is approximately 5 kilowatts (kW). Based on the average price of $3.16/watt, a 5kW system would cost $11,060 after tax credits. Below are some average 2017 quotes for other solar energy systems by size: 6kW solar energy system cost: $13,300.