PV Modules: Bifacial technology slide image

PV Modules: Bifacial technology

go PV Introduction Bifacial Ratio (BR) - Irradiation at the backside • Gback Bifacial Ratio Gfront tecnalia Inspiring Business Albedo is the diffuse radiation reflected by the soil out of the total solar radiation. Normally goes from 10% to 40%. Higher albedo means higher BR. It strongly impacts the bifacial ratio with nearly linear behavior. • Row-to-Row spacing (aka pitch) is the distance between rows. BR increases when this distance increase. It is related with GCR (Ground Coverage Ratio). . Clearance height is the distance between the bottom of the modules and the ground. Higher clearance means higher BR. • Tilt of the modules also affects the BR value. Albedo Row-to-row spacing Clearance Tilt Material Asphalt Light soil Concrete Beige built-up roofing White EPDM roofing Reflectance*(R) Grear at 1000Wm-2 front 0.1 70 Wm-2 0.21 130 Wm-2 0.28 170 Wm-² 0.43 250 Wm-² 0.8 430 Wm-² Deline et al., IEEE PVSC 2016; Deline et al., IEEE JPV (submitted) (National Renewable Energy Laboratory) GOPV Project | 1st TRAINING COURSES TECHNICAL FOCUS ON FUTURE SOLAR PV SYSTEMS October 26-29th 2020
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