Losses due to irradiance, temperature... and AM?

[JavierGV]

The evaluation of the "Losses" of a PV array (as for the definition of the normalized performance ratio), takes as starting point the energy which would be produced if the system worked always at STC conditions (1000 W/m², 25°C, AM1.5).

In the loss diagram of PVsyst we can see:

1) the PV loss due to irradiance level: the loss due to operating irradiance (instead of 1000 W/m²).

2) the PV loss due to temperature: the loss due to operating temperature (instead of 25°C STC).

But there is no PV loss due to operating AM level (instead of AM1.5).

Why?

[André Mermoud]

The spectral effects are not considered for Crystalline modules. They are considered negligible.

With amorphous modules, you have indeed an evaluation of the spectral effect, i.e. the deviation with respect to the AM1.5 conditions.