Overall the angle of your rooftop has less impact on solar panel performance than the direction your roof faces.
Ideal roof angle for solar panels.
However pitch angles between 30 and 45 degrees will work well in most situations.
Ideally a fixed roof mounted solar energy system should be at an angle that is equal to the latitude of the location where it is installed.
If you are trying to install solar panels on a steep roof it may not be possible to place panels at the optimal tilt with traditional racking systems.
While it s true they should face south for the best results a west facing system would have produced 49 percent more electricity during the peak demand hours of the summer months than a south facing system.
On the contrary in the countries of the southern hemisphere such as south africa and australia the best orientation is true north.