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). Obviously, the more sun you get, the more kWh a solar panel will produce. . 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. . Did you know that 23kW solar power systems can consist of a different number of panels depending on the size of the solar panels? Here are some common panel sizes which could make up a 23kW system: How Much Energy Does a 23kW System Produce? Depending on where in Australia (or around the world) you. . Solar panels are quietly transforming rooftops around the world, turning sunlight into electricity and helping homeowners slash utility bills.