Is full sun necessary for optimal solar array performance?

Types of Shading and Impact on Solar Panels

Solar shading can be broadly categorized into three types: temporary, seasonal, and permanent. Temporary shading is caused by passing clouds or nearby trees, while seasonal shading is due to the changing angle of the sun throughout the year. Permanent shading is caused by a physical obstruction, such as a building or a tree. Any amount of shading can impact solar panel performance, with a general guideline being a 10-15% reduction in efficiency for every 10% of the panel’s surface area that is shaded.

Measuring and Mitigating Shading

To understand the impact of shading on your solar array, it’s essential to measure the amount of sunlight your panels receive throughout the day. This can be done using a solar Pathfinder or a similar tool. Once you’ve identified the shading issue, you can take steps to mitigate its impact. This might include pruning nearby trees, installing a tracking system to adjust the angle of the panels, or using building-integrated photovoltaics (BIPV) that can be integrated into the roof or walls of a building.

Understanding Solar Panel Efficiency and Warranty

Solar panel efficiency is a measure of how well a panel converts sunlight into electricity. Most commercial solar panels have an efficiency rating between 15-20%. While shading can impact overall system efficiency, it’s essential to note that most solar panel manufacturers provide a warranty that covers degradation of panel efficiency over time. This warranty typically ranges from 25-30 years and covers a loss of efficiency that is not caused by external factors such as shading.