PV Solar panels on southern facing wall...

Any reason, structurally ,to not mount panels on the southern face of a building?
I figure one either eats the power loss,or tilts them out from the building.
At my latitude, the tilt is about 11 percent in summer,practically flat.
Mounting them on awnings would allow access to change the tilt seasonally,clean them if snow by dropping them flat,and maybe shade windows from solar gain, a win in my book,as  wood fired AC is much harder to do than wood fired heat.

I don't see why not.  As long as the building you are mounting them on is structurally sound.  I have AZ that mounted some on an outbuilding with the intention of making them tiltable to allow for the differences in summer and winter angles.  He found that in winter they had better output if left completely vertical.  The snow he receives reflects more light at the panels than he would receive if he tilted them toward the sun.

That should work fine