Hi Will,
You are correct. The IEC 68153 Single Diode model has inputs for the air mass modifiers, which are coefficients to the Sandia polynomial model for air mass described in King, D.L.; Gonzalez, S.; Galbraith, G.M.; and Boyson, W.E. (2007). "Performance Model for Grid Connected Inverters." 47 pp.; Sandia Report No. 2007-5036. (
PDF 1.3 MB
).
It does not have inputs for IAM coefficients.
Best regards,
Paul.