Can Bifacial Panels Utilize Light from the Sky?

Bifacial Panel Design and Functionality

Bifacial solar panels are designed to capture light from both the front and back sides of the panel. They feature a transparent or semi-transparent backsheet, which allows light to pass through and be absorbed by the solar cells. This design enables bifacial panels to generate electricity from sunlight reflected from the ground, as well as from direct sunlight. The front side of the panel still captures direct sunlight, while the backsheet allows for additional light to be absorbed from the surroundings.

Increased Energy Production

Studies have shown that bifacial panels can increase energy production by up to 25% compared to traditional monofacial panels. This is because bifacial panels can capture light from the sky, which is particularly beneficial in environments with high levels of diffuse radiation, such as near the equator. In locations with low levels of diffuse radiation, such as in northern latitudes, the impact of bifacial technology may be less pronounced. However, even in these areas, bifacial panels can still provide a slight increase in energy production due to the capture of light from the ground.

System Design Considerations

When designing a system with bifacial panels, it’s essential to consider the ground reflectance and the amount of light that can be captured. The reflectance of the ground can vary greatly depending on the surface type, with dark-colored surfaces reflecting more light than light-colored surfaces. To maximize energy production, it’s recommended to install bifacial panels on a surface with high reflectance, such as a metal roof or a reflective tarp. Additionally, the angle of the panel and the tilt of the array can also impact the amount of light captured, so careful consideration should be given to these factors during system design.