If we know both the solar panel size and peak sun hours at our location, we can calculate how many kilowatts does a solar panel produce per day using this equation: Daily kWh Production = Solar Panel Wattage × Peak Sun Hours × 0. 75 / 1000. Most common solar panel sizes include 100-watt, 300-watt, and 400-watt solar panels, for example. How Much Sun Do You Get (Peak Sun Hours). Example: A 500W panel produces 50% more energy than a 250W panel under. . Estimate how much electricity your solar panels will produce in kilowatt-hours (kWh) based on system specifications and location. This rating has grown over time, so older panels may produce less electricity, depending on age.
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