Turn 'off' the default Anti-Reflective Coating assumption

  • Caitlin Johnson
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25 Apr 2022 15:28 #10872 by Caitlin Johnson
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,
CaitlinĀ 

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  • Paul Gilman
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25 Apr 2022 22:41 #10875 by Paul Gilman
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.

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