How much energy does a 200 W solar panel produce in a day?

A rough estimate is 200 Wp × peak sun hours × performance factor. At four peak sun hours and 0.75 performance, that is 600 Wh a day. This is an arithmetic example, not a nationwide US yield or annual average. Replace the sun hours with location and season data.

Partial shade, poor orientation, heat, dirt and wiring or controller losses reduce delivered energy. On an RV, the panel may only be deployed part of the day. For a specific location, use PVWatts and record your assumptions.

If you use 600 Wh daily, an example that also produces 600 Wh leaves little buffer for cloudy days and unexpected losses. Consider storage and alternative charging. Before buying, match Voc, current and connector with your controller or power station using our compatibility checklist.