Solar Panels (in earth atmosphere) refract and reflect white or yellowish light. Just like the default lighting in most modeling software.
The material output for these panels is designed to complement space scenes lit by the intensity of the sun.
In doing so it is casting a reddish-orange glow on the reflective surface of the panel. Even in White default lighting, this surface will display these color properties
In the material itself. The user can control the color of the reflective surface by a color picker. Tested as working in Blender Cycles and Eevee. Making it adaptable to other lighting environments and suit the color for the scene.