I'm planning to design a PV system that have an orientation to north (Azimuth 0°) but due too terrain that I used, the overall plane azimuth keep changing up to -20°. The problem with that is, 
 
	Firstly i'm not sure is -20° are the optimum azimuth for my system or not
 
	Secondly, my report will be questionable because usually the optimum azimuth in my region (Indonesia) is around )°
 
	Is there any way to set the plane azimuth to 0° even I'm using the un-flat terrain?