About 97% of solar panels quoted on the EnergySage Marketplace in 2025 are 400 to 460 watts—expect to see panel outputs in this range in your quotes. Your panels' actual output will depend on your roof's shading, orientation, and hours of sun exposure. . Caution: Photovoltaic system performance predictions calculated by PVWatts ® include many inherent assumptions and uncertainties and do not reflect variations between PV technologies nor site-specific characteristics except as represented by PVWatts ® inputs. For example, PV modules with better. . Here is the formula of how we compute solar panel output: Solar Output = Wattage × Peak Sun Hours × 0. But wattage alone doesn't tell the whole story. This calculator estimates the Annual Energy Production (AEP) for a given energy generation unit based on its installed capacity, operating hours per year, and capacity factor.
[PDF Version]
Menu
