How Many Peak Sun Hours in Arizona? (Heat Degradation Facts)
Arizona boasts the most favorable solar conditions in the United States. To calculate your system's efficiency, solar engineers measure "peak sun hours"—the specific time of day when solar irradiance reaches 1,000 watts per square meter.
Unmatched Solar Insolation
Cities like Phoenix, Tucson, and Yuma average an incredible 6.5 to 7.5 peak sun hours per day. This means your panels will produce massive amounts of electricity throughout the year.
The Danger of Heat Degradation
While sunlight is abundant, extreme desert heat actually reduces the efficiency of cheap solar panels (a factor known as the temperature coefficient). Because Arizona roof temperatures can exceed 160 degrees, budget panels will degrade quickly and fail to produce enough power. This is why SunBeam Innovations strictly installs Tier-1, heat-resilient panels engineered specifically to maintain high output in extreme desert climates.
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