The IAM definition from the PV modules can be overwritten by unselecting the checkbox "Uses definition of the PV module". Available options are: Fresnel model (recommended with default coefficients). User defined: IAM measurements can be entered manually.
The IAM only concerns the angular dependency of this effect, i.e. it is normalized to the transmission at perpendicular incidence (0° incidence angle). PVsyst uses an IAM function, which describes the deficit of transmission as a function of the incidence angle.
The IAM model used in the simulation is defined in the "Detailed Losses" part. By default, PVsyst will take the values specified for the PV module (of each sub-array). But you can also specify another profile for this present simulation.
IAM losses are calculated by default from the PV module definition. However, the IAM model can be selected or compared from the Detailed Losses window, in the IAM losses tab. The IAM definition from the PV modules can be overwritten by unselecting the checkbox "Uses definition of the PV module".
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Difference of IAM values of the solar cells with different AR glass relative to the Bare Cell. The inset present the same graph with smaller y-scale for better view of the details.
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