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Pitch RMS limit for bifacial 2D models - Bifacial project with different pitch distances

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Dear Team, 

In the advanced parameters section there is the Pitch RMS limit for bifacial 2D models, with a default value of 0.10m.  More specifically, working on a project with different pitch distances, the bifacial ability of panels is not able to be applied on different pitch distances. Increasing the limit mentioned above from default value to 0.4m value, the simulation is able to conducted. 

Could you please explain exactly the impact of different values of this parameter (Pitch RMS limit for bifacial 2D models) and the results that we were expecting with the default value (0.1m) in comparison to other values? How the expected P50 production is affected from this change? 

Is there any specific reason behind the selection of the default value (0.1 m) of the Pitch RMS limit for bifacial 2D models? 

Thank you in advance. 

Kind Regards

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This parameter is a threshold for the RMS value of the pitch distribution that PVsyst finds in the 3D drawing.

The bifacial models in PVsyst are an approximation that is valid for identical long rows with constant pitch (spacing). If the simulation uses a 3D drawing of the PV system, then PVsyst will check if this drawing comes close to this idealization. For this purpose, it will calculate the RMS of the pitch distribution, and if it finds a value larger than the threshold, it will issue an error message, and the simulation will not be possible.

The default value of 0.1 m is not based on a specific study. The error message is meant to remind the user that the system which is being simulated, is not fully compatible with the idealized assumptions, and therefore an additional uncertainty of the bifacial contribution in the simulation results is to be expected.

So far there is no study that quantifies the increase of uncertainty in the simulation results as a function of the RMS of the pitch distribution. It will become possible to address this, once we have a more sophisticated bifacial model, which will be based on the 3D drawing. This is in work and will still require several months of development.

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