Same thought on Meteonorm, i've always thought of it as the most reliable, came here to see what people thought of PVGIS 5.2
 
	Ran a quick test in Perth, Meteonorm shows 100% Sat?
 
	Source                Global                Diffuse
 
	Meteonorm 8.0  2052.6                568.0
 
	NASA-SSE         1836.3                565.2
 
	PVGIS 5.2           1921.6                612.8
 
	Gonna have a significant effect on results, so like to hear the consensus on what is more accurate?