The optimum is when the roof on which the photovoltaic system should be installed, is oriented between southeast and southwest.
The slope of the roof should be at most 20 to 60 degrees.
The more the installed PV system deviates from these ideal conditions, the more roof area should be made available, or the more RAH solar modules should be installed on the roof to compensate for the differences.
Roof Panels
Roof-Panels with RAH Solar Modules