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A 375-watt solar panel is designed to convert sunlight into electrical energy, boasting a maximum output of 375 watts under optimal conditions. These conditions typically refer to a sunny day with the sun directly overhead, known as Standard Test Conditions (STC). The primary components of solar panels include photovoltaic (PV) cells, which are responsible for the conversion of sunlight to electricity. The efficiency of a panel often hinges on the quality of these cells and the overall design of the panel.

As of late 2023, the average cost of one solar panel ranges from $200 to $600, depending on several variables, including the panel's brand, efficiency, warranty, and technology type. Most solar panels are measured in watts, with the most common residential panels having a capacity between 250 to 400 watts. Consequently, the overall price of the solar panel is often calculated on a per-watt basis, which generally falls between $0.50 to $3.00 per watt.