Skip to main content

​
Summary

Fixed-tilt arrays maintain a constant orientation throughout the year. PlantPredict assigns the user-defined tilt (βm\beta_m) and azimuth (γm\gamma_m) angles directly—no calculations or optimizations are performed. These constant values are used for all timesteps in the prediction.

​
Inputs / Outputs

NameSymbolUnitsDescription
Module Tilt Angleβm\beta_mdegreesAngle of module surface from horizontal (0° = horizontal, 90° = vertical)
Module Azimuth Angleγm\gamma_mdegreesDirection the module faces, clockwise from North (0° = N, 90° = E, 180° = S, 270° = W)
If βm=0°\beta_m = 0°, a small offset of 0.001°0.001° is applied so that the module surface has a definable azimuth (at exactly 0° the surface is horizontal and its azimuth is undefined). The , which determines how much direct beam irradiance reaches the module surface, is calculated separately (see Incidence Angle).