The most popular solar panel choices range from 100 to 400 watts per panel. For RV applications, many owners install panels closer to the 200-300-watt range for a balance of efficiency, cost, and available roof space. (And unless you're the luckiest camper in the world or have discovered a way to control the weather, we guarantee you won't always have perfect conditions. A 400-watt system typically yields 1. 4 kWh daily, enough for essential appliances. Panel tilt, angle, and temperature critically. The quantity of solar energy produced by a recreational vehicle (RV) varies significantly based on several factors. Location and sunlight availability, 4.