As of publishing, the average cost per watt is $2.84. Most solar companies set the price according to the solar system''s wattage. A solar installation''s “cost per watt” is a little like the “price per square foot” when you buy a house. It helps compare the value of solar energy systems in different sizes.
According to studies by the U.S. Department of Energy, the all-in cost of a home solar panel system is between $2.74 to $3.30 per watt. 1,2,12 This figure includes the solar panels, the installation, and other expenses. Using these numbers, an average-sized 8-kilowatt residential solar system would cost between $21,900 – $26,400.
Calculating solar price per watt is pretty simple. Simply divide the cost of the system (in dollars) by the size of the system (in watts). PPW = System cost / System wattage Now, solar systems are typically sized in kilowatts (kW), so you’ll have to multiply by 1,000 to convert to watts.
Generally, installing solar panels on businesses costs a bit less per watt because the systems are larger, but the total costs will be higher. In 2025, the average cost for commercial solar panels is just about $2.00 per watt. There is a lot to consider when figuring out how much you’ll spend on a solar installation.
Our solar power systems and energy storage products are engineered for reliability, safety, and efficient deployment. All systems include comprehensive monitoring and control systems with remote management capabilities.
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