50 per watt installed on average, with homeowners spending about $3. A 6- to 10-kW solar panel installation costs $12,600 to $31,500 after the 30% federal tax credit. . Average price of solar modules, expressed in US dollars per watt, adjusted for inflation. Data source: IRENA (2025); Nemet (2009); Farmer and Lafond (2016) – Learn more about this data Note: Costs are expressed in constant 2024 US$ per watt. Global estimates are used before 2010; European market. . Most homeowners spend between $12,600 and $33,376 to install a complete residential solar system in 2026, with the national average at $19,873 before incentives. Your actual cost depends on your home's energy needs, roof characteristics, location and other factors, all of which we'll break down in. . Weekly spot price report for 182mm modules will be based on the 182*182-210mm format from June 2024 onwards due to the slim price gap among varying formats. Popular questions about solar panel prices: Why are solar panel prices fluctuating? Which variables impact the price of a solar panel? Where do solar panels come from?. Solar panels cost $3. These projects range from megawatt (MW) to gigawatt (GW) scale, making them the most cost-effective. .