I am simulating PV panels in vertical planes (plane tilt 90degrees, e.g. on the sides of buildings). At low latitudes I notice that an azimuth of zero does not give the most GII, instead somewhere to the east or west is better.
The three screenshots show the effect of azimuth on GII at different latitudes:
1. Australia, latitude -17deg
2. South Africa, latitude -34deg
3. New Zealand, latitude -47deg
Is someone able to explain to me why the north-facing orientation (in the southern hemisphere) does not have the highest GII for latitudes close to the equator?
Thanks!
