Is Solar Production Generally Higher in Summer vs Winter?

Understanding Seasonal Solar Production

Solar panel efficiency is directly related to sunlight exposure and duration. In areas with higher latitudes, the winter months receive less direct sunlight and shorter days, which can result in up to 20% lower solar production compared to the summer months. In contrast, locations closer to the equator experience relatively consistent solar production throughout the year, with minimal seasonal variation.

Seasonal Solar Production Variations by Latitude

For example, a location like Seattle, Washington (47.6°N) experiences a significant decrease in solar production during the winter months, with an average of 2.5 peak sun hours (PSH) in December compared to 4.5 PSH in June. In contrast, a location like Miami, Florida (25.8°N) experiences relatively consistent solar production, with an average of 5.5 PSH in December and 6.5 PSH in June. This difference in solar production is primarily due to the angle and duration of sunlight exposure.

Optimizing Solar Production During Winter Months

To maximize solar production during the winter months, it’s essential to consider the installation angle and orientation of solar panels. In regions with lower latitudes, installing solar panels at a steeper angle (between 30° and 40°) can help capture more direct sunlight during the winter months. Additionally, using high-efficiency solar panels or incorporating energy storage systems can help mitigate the impact of reduced solar production during the winter months.