Better Optimising PV System orientation

In general deviations in the system inclination between 0-45° are not counted as being problematic and can be compensated by the expansion of installed power by addition on solar panels or solar collectors (this applies particularly to the thermal solar systems).

The table below depicts the various different roof inclination angles for different orientation of rooftop positions and the likewise energy yield that is expected. 

However, missing out on south exposure for the system can not be compensated.

In any optimally designed PV system, a ratio of 1:1 is possible (1000kWh/year from 1kWp PV installed), then PV system with 60′ south-west orientation and 40′ roof inclination will reach approx 90% of annual energy yield, in this case 900kWh/year from every 1kWp installed.