IAM at one angle, and a yearly beam-weighted IAM loss

Every default is invented or taken from the pvlib defaults the page cites; none is a fitted value for your module. Part B starts with the shares from our invented clear-sky site. It covers beam light only and uses the middle of each angle band.

A. IAM at one angle

Angle of incidence (degrees, 0 to 89.9)

Martin-Ruiz a_r (above 0, up to 1)

ASHRAE b (0 to 0.5)

Or IAM at 50 degrees (optional, sets ASHRAE b)

B. Beam-weighted IAM loss over a year

Model for Part B

0 to 20 degrees (% of beam)

20 to 40

40 to 50

50 to 60

60 to 70

70 to 80

80 to 90