What is a bifacial solar panel?

A bifacial panel differs from standard monofacial modules because its rear surface is transparent or semi-transparent, allowing light reflected from the ground or nearby surfaces to reach the back-side photovoltaic cells. Both surfaces contain active solar cells that convert light into electricity.

The additional energy yield from the rear surface depends on ground albedo, or reflectivity. In Perth, surfaces like light-colored render, gravel, sand, or concrete reflect more sunlight toward the rear of the panel. White-painted roofs, polished concrete, or specially laid reflective ground materials can significantly boost performance. Mount height also matters: raising panels higher above the ground increases the angle at which reflected light hits the rear cells.

Bifacial panels suit Perth installations where ground reflectivity is naturally high or can be optimized. Rooftop systems perform better on light-colored roof surfaces or when mounted at sufficient standoff distance. Ground-mounted systems in commercial settings often benefit more than rooftop residential arrays, since installers can choose the mounting height and control ground surface properties.

Output gains typically range from 5 percent to 25 percent depending on installation geometry and local reflectivity, though actual gains are site-specific. Perth's sunny climate and availability of reflective surfaces make bifacial panels a viable option for customers seeking higher yields from available roof or ground space. Suppliers across the residential solar category increasingly offer bifacial modules alongside traditional panels.