Even a small amount of shading can cause a significant reduction in the power output of a solar panel. This is because solar panels are connected in series, and when one panel is shaded, it acts as a resistor, reducing the flow of electricity through the entire string of panels. Understanding the nuances of shading is essential for anyone involved in solar energy, from homeowners considering rooftop. . Solar panels are a cornerstone of renewable energy, providing sustainable solutions for homeowners and businesses alike. Shading can occur due to various sources. .