Question-and-Answer Resource for the Building Energy Modeling Community
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If you have a decent amount of insulation, the effect of this on the thermal load of the zone is very small. Especially if not the whole building surface is covered with PV, just some part of it.
The effect of the reduced heat gain due to the removed energy in form of electricity is similar to changing the albedo of the surface. As an example, if your PV is 18% efficient, then taking into account the surface "cooling effect" of the drained electricity is roughly equivalent with reducing the surface albedo during daytime by 0.18 (e.g. from 0.9 to 0.72), which might not affect your cooling loads that much.
The removed heat is more interesting for the PV itself (if the Integrated Surface Outside Face option is used to calculate its temperature), as the efficiency if the PV is dependent on its temperature.
