1x trackers miss out on part of reflected light according to preliminary measurements taken at Soltec’s Bifacial Tracking Evaluation Center (BiTEC)
Soltec is performing field tests at BiTEC, world’s first evaluation center specialized in bifacial trackers. Among those tests, the company is comparing bifacial production of 1x configuration solar trackers versus Soltec’s SF7 Bifacial, a 2x configuration tracker.
Soltec’s SF7 trackers have a standard height of 7.71 ft (2.35 m), while 1x-configuration trackers have a height of 4.43 ft (1.35 m). Preliminary electric performance measures over bifacial modules reveal a short-circuit current difference of over 2.3 percent between 1x and 2x trackers, meaning that height has a significant influence over the energy output of bifacial panels. The capture of diffuse irradiance below and around the tracker is increased with height, while the shadow casted on the ground is softened.
BiTEC will be officially inaugurated on July 9 in Livermore, California. This center counts on the collaboration of the main of bifacial modules manufacturers and American organizations specialized in renewable energy such as NREL or RETC.
Soltec history with bifacial tracking dates to 2015 when a customer needed a test-bed for utility-scale bifacial tracking. Soltec responded with La Silla solar power plant in Coquimbo, Chile. The power plant is comprised of Soltec trackers with 2x configuration and has exhibited 14.9 percent of gain over monofacial tracking with a bifacial ratio above 17 percent.