To be consistent with PVWatts Calculator, bifacial with "Fixed roof mount" array type should result in simulation notice: "Bifacial modules require space under the module. Fixed roof mount array type is not appropriate for bifacial modules because it assumes there is no space between the back of the array and the roof surface." (Note current message for bifacial with one-axis tracking: "The bifacial model is designed for fixed arrays and may not produce reliable results for tracking arrays.")

Also consider these checks for pvsamv1.