Energy Yield calculation - Detailed PV model

Hello all,

I have resolved the problem and understood where it came from. 
Basically, to my understanding; The calculation done by the model of SAM and the one that is displayed in the summary of the simulation is the specific yield BEFORE the grid limit. So it takes into account the clipping that happens at the inverter level, but not at the grid limit.
It is very easy to calculate the specific yield yourself by using the Annual AC energy,

So it must be that the formula shown below here is not the one that is actually used by SAM to calculate the specific yield.
I hope this will help whomever might encounter the same issues.

Regards,
A Magnus