How much does a 4.5 kW solar system cost? As of January 2022, the average cost of solar in the U.S. is $2.77 per watt ($12,465 for a 4.5-kilowatt system). That means the total cost for a 4.5 kW solar system would be $9,224 after the federal solar tax credit (not factoring in any additional state rebates or incentives).
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