EU PVSEC Programme Online
EU PVSEC 2021, 6 - 10 September 2021
Presentation: 4AV.2.9 The Impact of Real Albedo Values on Energy Estimation for Bifacial Modules
Type: Visual
Date: Monday, 6th September 2021
17:00 - 18:30
Author(s): H. Sánchez, S. Dittmann, C. Meza, R. Gottschalg
Presenter / Speaker: S. Dittmann, Anhalt University of Applied Sciences, Köthen, Germany
Event: Conference Conference
Session: 4AV.2 PV Module Characterisation, Testing and Outdoor Performance
Topic: 4. 1 PV Module Design, Manufacture, Performance and Reliability
Summary / Abstract: Bifacial technology becomes a popular technology nowadays. The bifacial technology can collect electricity from the incident and albedo radiation reaching both the front side and backside of a solar module. This is possible because it exposes both the front and back solar cells, changing the common backsheet with glass. According to the literature [1]– [5], this change improves the electrical generation up to 30 %. This advantage explain why it is expected a market share for bifacial models of 35% worldwide [6]. Albedo has a significant contribution to the estimation of energy for bifacial modules [7]. It has almost a proportional linear relation compare to bifacial gain in the solar modules. However, there is evidence that albedo values can dramatically shift, based on sun angle, seasonal irradiance, type and seasonal variation (due to the vegetative ground cover, degree of backside shading, presence and degradation of snow, and prevalence of airborne particles, such as soot, that absorb light). Interesting experimental results about these changes, in several locations around the world, can be found in [8]. This study presents a realistic consideration in the measurement of albedo and its impact in the estimation of bifacial energy prediction. Then, one of the study topics are the simulation tools for the energy estimation in bifacial modules. Nevertheless, practically all simulation tools use as default a constant value of albedo for all year or simulation period. This situation might carry out accuracy about the realistic behavior of the system when becomes installed. There is mandatory to improving the simulations tools for bifacial modules with realistic data, to get more accurate predictions. With that, empowering stakeholders on the investment and implementation of bifacial systems [9]-[11]. Bifacial technology can become anally for the transition to a green economy. The present work presents the impact that using real measured data of the albedo has on the energy estimation for bifacial module against the case when the albedo value fits constant in the simulation.