in which direction shell the PV Modules look
From the location of the PV moduls you shell see the sun directly at all times of the year.
Hide shaddowing of the modules . Also if they are only 10% or less.
Define the tilt of the modules against the horizont.
Select the holding style for the modules.
Do you like to supply 100% of the energy into the grid or do you like to use a part by yourself? (Eigenverbrauch)