Energetica India Magazine: september 2020

SOLAR POWER Figure 7: Torque tube spread shade in the rear side of the module Bifaciality analysis conclusions Considering the abovementioned bifacial parameters, it is possible to assess how bifacial gain increases in relation to normalized solar tracker height, or its aspect ratio, as it is also known in the market. For a common albedo of 0.25, bifacial gain can be expect- ed to increase a few tenths of percentages when normalized height increases 0.05. In other words, the height of our 1P tracker should be raised 100 mm for a 2-meter collector. The two bifaciality steps for the two most common configu - rations in the marketplace (1P and 2P) are presented below for a specific position of 0º (which generates the largest rear irradiance in absolute terms of W/m 2 ): As illustrated, bifaciality is more beneficial for increased nor - malized solar tracker module height. This suggests, if costing allows it, that trackers can be installed higher from the ground if monofacial panels with larger supports are used. To define optimal height, it is necessary to consider other tech - nical factors which make the analysis more complicated, such as the type of soil and wind load, in addition to the inherent difficulty of installing trackers at an increased height. In any case, bifacial panels have become increasingly popular over the last few years. Now it is a matter of understanding how this promising technology, which has clear and solid advantag- es, evolves in the future. 29 energetica INDIA- September_2020