Help in Comparing Outputs for PV System Outputs

Hi Paul,

I am trying to validate the results of my SAM model by modelling a few PV systems from Australia. I have some info on these systems -

System Design (Azimuth, Tilt) 
Electrical Config (modules in series/parallel)
Module and Inverter datasheets. 

I am completing the simulation by using the weather file from ( climate.onebuilding.org/WMO_Region_5_Southwest_Pacific/AUS_Australia/index.html#IDNT_Northern_Territory-)

Apart from the known info, I have kept the rest of the inputs as default. 

For all these sites, I have the single phase AC Power values (which I have converted to hourly) for a couple of years of data. 

My idea is to compare these values to that of the system power generated (gen) values which I get in SAM/PySAM result. 

I want to know how should I consider which inputs should I adapt to the Australian standard in order to get accurate results. 

My understanding is that the soiling conditions from Australia might play a role in the Output. And I would investigate other such parameters as well. 

However, how is the system power generated (gen) calculated? 

If I would be able to know that, perhaps I would make realistic assumptions for the effective parameters to make my comparative analysis more accurate. 

Please let me know what you think about this. 

Thanks, 
Ajinkya