Interesting the Uni says only install it on one or two walls "At...

Interesting the Uni says only install it on one or two walls

"At the same time, the overall architectural design of buildings should ideally account for the site-specific and climate specific energy-harvesting performance optimization of wall-mounted PV arrays or windows, for example by installing these systems on one or two of the most suitable building walls only"

but CPVs model had it on three. Sounds like CPV were desperate to get their number as high as possible perhaps??? Hmm.