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OpenStudio doesn't directly support PV yet, but we do have an EnergyPlus Measure that takes shading surfaces already in the model and creates PV using PhotovoltaicPerformance:Simple objects. Arguments are exposed for the type of shading surface to use (Site, Building, or Space/Zone) along with the fraction of surface that is covered with PV, and the panel efficiency. You could easily update this to do a string search on surface name if you didn't want it to apply to all shading surfaces of a specific type.