A 320 watt solar panel is a popular choice in the U. market, but what does that wattage really mean in terms of actual energy production? This article will delve into the specifics of a 320 watt solar panel's power output, its relevance, and the factors that influence its. A 320 watt solar panel is a popular choice in the U. Typically, the higher the wattage of a solar module, the more energy it can produce, and consequently, the fewer modules you might need. You'll often see it referred to as “Rated Power”, “Maximum Power”, or “Pmax”, and it's measured in watts or kilowatts peak (kWp). However, the rated power does not mean the panel will always generate that.