Turn 'off' the default Anti-Reflective Coating assumption

Hello,

According to the release notes, a major difference between the v2020 and v2021 versions of SAM is the default assumption that all PV modules have an anti-reflective coating. Is there a way to turn that assumption OFF in v2021 (without going back to the v2020 version) of SAM?

Thank you,
Caitlin 

Hi Caitlin,

It is not possible to "turn off" the anti-reflective coating assumption without modifying the source code and building your own custom version of SAM. For reference, here is the relevant code.

The anti-reflective coating option is set by the last parameter with value of 'true' in the calculateIrradianceThroughCoverDeSoto() function here:

github.com/NREL/ssc/blob/839cfbe86a00742455ed1104e3e6309c8e741ea2/shared/lib_cec6par.cpp#L75

The irradiance-through-cover model is here:

github.com/NREL/ssc/blob/839cfbe86a00742455ed1104e3e6309c8e741ea2/shared/lib_pv_incidence_modifier.cpp#L128

The transmittance() function is defined here:

github.com/NREL/ssc/blob/839cfbe86a00742455ed1104e3e6309c8e741ea2/shared/lib_pv_incidence_modifier.cpp#L28

Best regards,
Paul.