# Bifacial_Multiple orientation_Structure en croix

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Bonjour,

Je travail actuellement sur un projet en haute montagne pour lequel je dois simuler une structure photovoltaïque en forme de croix.
La structure est composée de 4 ailes avec 4 modules pour chaque ailes soit 16x modules par croix ( 8modules sud ouest et 8modules sud est).

Simuler ce genre de structure pour un panneau standard ne pose pas de problèmes mais nous avons des panneaux bifaciaux. Je vous transmets également un printscreen d'une aile.
Auriez-vous une solution pour ajouter le gain bifacial? Il s'agit d'un projet en altitude ou le gain bifacial semble intéressant.

D'avance merci beaucoup,

Dimitri

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Dear Dimitri,

Thank you for your question. Just a quick reminder, the official language of the forum is English, so you will benefit most from it when asking questions in English (there is no automatic translation).
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One (difficult to configure) option in your case would be to use monofacial modules of different efficiencies to model the front and the back of the bifacial module. These should be connected in parallel to add up the currents.

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Another option is to assimilate the bifacial gain to a simpler variant with only a single orientation. Choose only one side of the cross and run the bifacial model. Running the simulation with the backside irradiance modeling on and off will allow you to extract a relative bifacial gain. The perpendicular second side of the cross should be modeled as shading objects (rectangles).

Since the bifacial model is not counting the perpendicular side of the cross modeled as shading objects, the shading factor for the backside should be increased accordingly. The proportion of backside shading is likely around 25%. To get a precise idea of the backside shading factor to be applied, you can observe the shading factor for the front side. Then, apply the same shading factor to the backside by means of the parameter in the bifacial model. The mismatch parameter for the backside should also be assimilated to the electrical shading loss of the front side.