3 2 1 BIFACIAL PV MODULES – CHARACTERIZATION AND SIMULATION Bifacial photovoltaic (PV) modules are able to utilize light from both sides and can therefore significantly increase the electric yield of PV power plants. The yield gain compared to monofacial modules is mainly determined by the conversion efficiency for solar irradiance incident on the rear side of a bifacial PV module, and the amount and quality of solar irradiance incident on the rear side. Our comprehensive services for bifacial PV modules at Fraunhofer ISE include module calibration and characterization accurate simulation of bifacial irradiance in field operation, including partial shading yield simulation and optimization power plant testing and monitoring analysis and optimization of cell-to-module efficiency analysis and optimization of module-to-system efficiency including BIPV systems reliability assessment of module materials and design analysis of local climatic stress conditions. Yield Assessment We compile yield assessments for bifacial PV power plants. With our unique simulation algorithm, developed in-house, we can make accurate predictions for the irradiation not only on the front side, but also on the rear side of the module. The detailed analysis considers characteristics of the system and the site (such as the reflection of the underground, shading, mounting height and the inclination angle) and provides recommendations for optimizing system design and yield. 1 Bifacial PV modules installed on a bright colored, highly reflecting flat roof. 2 The additional yield for bifacial power plants depends on the reflectivity of the surroundings: e. g. white foil, different soils or vegetation. 3 Rendering of a bifacial PV power plant. Simulation model used to calculate the irradiance available on front and rear sides of the modules. Fraunhofer Institute for Solar Energy Systems ISE Heidenhofstr. 2 79110 Freiburg, Germany Photovoltaic Modules and Power Plants – Photovoltaic Power Plants Dr Christian Reise Phone +49 761 4588-5282 [email protected]CalLab PV Modules Alexandra Schmid Phone +49 761 4588-5066 [email protected]www.ise.fraunhofer.de FRAUNHOFER INSTITUTE FOR SOLAR ENERGY SYSTEMS ISE PMZ-0216
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BIFACIAL PV MODULES – CHARACTERIZATION AND SIMULATION · 1 2 3 BIFACIAL PV MODULES – CHARACTERIZATION AND SIMULATION Bifacial photovoltaic (PV) modules are able to utilize light
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BIFACIAL PV MODULES – CHARACTERIZATION AND SIMULATION
F R A U N H O F E R I N S T I T U T E F O R S O L A R E N E R G Y S Y S T E M S I S E
PMZ-0216
Yield gain depending on system design and conversion efficiency of module rear side
Irradiance on rear side in kWh, depending on reflectance of environment and system design (especially mounting height, distance between rows and inclination angle)