Model step
Dark intervals
Timesteps with the sun below the horizon
Inputs used: Diffuse horizontal irradiance, Plane tilt, Albedo
What it is
Some weather files carry a little diffuse light in timesteps during which the sun never rises above the horizon, for example just before sunrise. This step decides whether that light counts.
Options
- Zero: no light on the plane in a timestep without sun above the horizon
- Isotropic diffuse: the file's diffuse light placed on the plane as a uniform sky
API
site.night_irradiance = zero | isotropic_diffuse