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Design Builder export BIPV surfaces into IDF of Energy Plus leaving blank the Transmittance Schedule (=always opaque). So if you want to assing a transparency to your GLAZED BIPV you can edit IDF and assign a Fraction Schedule of transparency in lieu of leave blank (=always opaque). In IDF you have to go in "Shading:Building:Detailed" search the names of your BIPV surfaces and assign them your fraction schedule transparency (made it first in "Schedule:Compact") into the blank line (Transmittance Schedule Name) under each name of your GLAZED BIPV surfaces.