Differences in GlobbInc in tracker simulations

[dkourk]

I am new to PVSyst and have a problem understanding where some significant differences in GlobInc are coming between two different simulations for the same site. One is simplistic and does not use a 3d scene and the other has a defined PV array and 3d scene. I would expect maybe to see some reductions in production from the detail in the simulation but here I have a significant difference that I need to make sense off. , not sure if I should open a new thread though.

The orientation is optimal N-S in the 3d scene and I see no material losses from shading. The starting value of the Globlinc is materially different and I think this is what produces a very low specific production for the 3d scene simulation vs the simplistic one and vs some actual data from a nearby fixed tilt PV that I have data for. It might be worth noting I am using a different meteo file for the two, however the starting point (GlobHor) is very similar so I do not think this is the cause of the difference.

Any help, guidance or explanation on what I am doing wrong would be much appreciated.

 

tnx, DK