Shading from adjacent panels, a type of self-shading, can significantly impact the overall efficiency of a solar panel array. This occurs when the edges of panels or rows within the array cast shadows on neighboring panels, typically at certain angles of the sun. Understanding this phenomenon is crucial for optimizing solar panel system design.
Impact of Self-Shading
- Nature of Self-Shading: Self-shading generally affects the perimeter of solar arrays and can be particularly significant in large installations where there are multiple rows of panels. As the sun moves, shadows from adjacent panels or rows can reduce the energy output of the affected panels.
- Effect on Efficiency: While self-shading is often unavoidable, it can lead to a decrease in the overall efficiency of the solar array. The impact is typically less severe than hard shading from external objects but can still result in reduced productivity, especially if not accounted for in the system design.
Mitigation Strategies
- Optimized System Design: Solar installers can mitigate self-shading by carefully designing the layout of the solar array. This includes selecting an optimal panel tilt and spacing to minimize shading at different sun angles throughout the day.
- Module-Level Power Electronics (MLPEs): Implementing technologies like microinverters or power optimizers can help minimize the impact of shading on overall system efficiency. These devices allow each panel to operate independently, maximizing energy production even when some panels are shaded.
- Bifacial Panels: Using bifacial solar panels can also help mitigate the effects of shading. These panels can capture reflected light from the ground, which can partially compensate for shading on the front side.
By understanding and addressing self-shading through proper system design and technology, solar panel efficiency can be maximized even in installations where some level of shading is unavoidable.
Original article by NenPower, If reposted, please credit the source: https://nenpower.com/blog/how-does-shading-from-adjacent-panels-impact-overall-solar-panel-efficiency/
