Solar System Efficiency: Do Peak Sun Hours Differ By Latitude In The U.S.?

Peak Sun Hours by Latitude

Peak sun hours, also known as sunshine hours, vary significantly across the United States due to differences in latitude. States located near the equator, such as Florida and Hawaii, receive an average of 5-6 peak sun hours per day, while states near the poles, such as Alaska and Washington, receive an average of 2-3 peak sun hours per day. This variation is crucial for solar panel efficiency and output.

Solar Panel Efficiency Considerations

When designing a solar panel system, it’s essential to consider the peak sun hours of the location. A higher number of peak sun hours typically translates to higher solar panel efficiency and output. For example, a solar panel system installed in Florida can produce up to 50% more electricity than a similar system installed in Washington. This is because Florida receives more peak sun hours, allowing the solar panels to generate more electricity.

Using Peak Sun Hours for System Design

To account for the variation in peak sun hours, solar panel system designers use a technique called “derating.” This involves adjusting the system’s size and capacity based on the expected peak sun hours of the location. For example, if a system is designed for a location with 4 peak sun hours per day, it may require a larger array size to produce the same amount of electricity as a system designed for a location with 6 peak sun hours per day. By using derating techniques, designers can ensure that solar panel systems are sized correctly for their location and produce the maximum possible electricity output.