Solar technology

Hello. I am new to PV*SOL and will design a slightly advanced pitched roof. Do you have any tips on how I can draw the red triangle with a roof?

Is it possible to rotate the panels 90 degrees from the position of the panels? The panels follow the building, but this will be a more north/south installation. the idea here is to rotate them 90 degrees to get east/west direction

Hello Is there a function to calculate ballast for solar cells on a flat roof?