pvlib.iam.sapm

pvlib.iam.sapm(aoi, module, upper=None)

Determine the incidence angle modifier (IAM) using the SAPM model.

Parameters:

• aoi (numeric) – Angle of incidence in degrees. Negative input angles will return zeros.
• module (dict-like) – A dict or Series with the SAPM IAM model parameters. See the sapm() notes section for more details.
• upper (None or float, default None) – Upper limit on the results.

Returns:

iam (numeric) – The SAPM angle of incidence loss coefficient, termed F2 in [1].

Notes

The SAPM [1] traditionally does not define an upper limit on the AOI loss function and values slightly exceeding 1 may exist for moderate angles of incidence (15-40 degrees). However, users may consider imposing an upper limit of 1.

References

[1]	(1, 2) King, D. et al, 2004, “Sandia Photovoltaic Array Performance Model”, SAND Report 3535, Sandia National Laboratories, Albuquerque, NM.

[2]	B.H. King et al, “Procedure to Determine Coefficients for the Sandia Array Performance Model (SAPM),” SAND2016-5284, Sandia National Laboratories (2016).

[3]	B.H. King et al, “Recent Advancements in Outdoor Measurement Techniques for Angle of Incidence Effects,” 42nd IEEE PVSC (2015). DOI: 10.1109/PVSC.2015.7355849

See also

pvlib.iam.physical(), pvlib.iam.ashrae(), pvlib.iam.martin_ruiz(), pvlib.iam.interp()

Examples using pvlib.iam.sapm

Diffuse IAM Calculation