Beam on a fixed or tracking plane, and DNI from GHI and DHI

Every default is invented. Part A uses a constant DNI for all daylight hours, so it shows geometry, not yield. It uses solar time and a simple declination formula, with no equation of time, refraction or horizon.

A. Beam on the module plane

Latitude (degrees, north positive)

Day of year (1 to 365)

DNI, constant (W/m2, invented)

Fixed tilt (degrees from horizontal)

Fixed azimuth (degrees from north; 180 is south)

Tracker rotation limit (degrees each way)

B. DNI derived from GHI and DHI

GHI (W/m2, invented)

DHI (W/m2, invented)

Solar zenith (degrees)

Error in GHI minus DHI (W/m2, invented)