A 3 Kw domestic photovoltaic system can be a problem if you need to make holes in the roof. Not if you use Sun Ballast as done by our customer Helios who with the 10 ° V ballast, managed to create a structure for photovoltaics that performs both,the function of support and ballast against the actions of the wind.
Even the high parapets were not a problem thanks to the height of the ballast which avoided the creation of gray areas.