Quick Answer
Seasonal solar gains can vary significantly by location due to differences in latitude, elevation, and atmospheric conditions. In general, locations closer to the equator receive more consistent solar radiation throughout the year. However, even small variations in these factors can impact the amount of solar energy available.
Understanding the Impact of Latitude
The amount of solar radiation a location receives is heavily influenced by its latitude. Locations between 25° and 35° north latitude, such as Arizona and California, receive an average of 6-7 peak sun hours (PSH) per day during the summer months. In contrast, locations farther north, like New York and Massachusetts, receive an average of 4-5 PSH per day during the summer. The reduced solar radiation in these regions translates to lower seasonal solar gains.
The Effect of Elevation on Solar Radiation
Elevation also plays a significant role in determining seasonal solar gains. At higher elevations, the air is thinner, resulting in less atmospheric interference and increased solar radiation. For example, the city of Flagstaff, Arizona, is situated at 7,000 feet above sea level and receives an average of 7-8 PSH per day during the summer months. This increased solar radiation is due in part to the reduced atmospheric interference at high elevations.
Cold Weather Solar Performance
While solar panels can continue to generate power in cold temperatures, their performance may be impacted. As a general rule, solar panels produce 10-15% less electricity at 0°C (32°F) than they do at 25°C (77°F). However, newer solar panel models are designed to operate more efficiently in cold temperatures, and some systems can still generate 90% of their rated power at temperatures as low as -20°C (-4°F). To maximize seasonal solar gains, it’s essential to choose a solar panel model that is optimized for cold weather performance.
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