pvperfsolar performance modeling

Reference / Direct projection, low beam

Model option

Unshaded under 5 W/m² of beam

The beam and the circumsolar are not shaded on a timestep with under 5 W/m² of beam on the plane

Inputs used: Row-to-row shading geometry

Method

On a timestep whose beam on the plane is under 5 W/m², the beam and the circumsolar light are not shaded (1). The diffuse and albedo shading do not change.

The math

Fsh=0when Gb<5 W/m2(1)F_{sh} = 0 \quad \text{when } G_{b} < 5\ \text{W/m}^2 \tag{1}

where

Symbol Meaning Unit
FshF_{sh} the shaded fraction of the direct and circumsolar light —
GbG_{b} the direct light on the module plane after the horizon W/m²

References

  1. Analysis of PVsyst 8.1.5 outputs shows this convention in its results.

API

array.direct_beam_floor = beam_5_wm2

Symbols follow the symbol registry.