nassar

"This is quite normal. If you have overpower conditions, all the production hours for which the Power is limited will fall in this last bin (corresponding to PNom). " André Mermoud https://forum.pvsyst.com/viewtopic.php?f=4&t=4702

Hello No, it doesn't take the rear side irradiance into accounu, until know the biracial performance ratio is calculated as the mono-facial. "PR for bifacial systems The definition of the performance ratio should be something like a standard, defined by an official instance, and accepted by everybody. Now I have not yet seen any reference which would define a performance ratio for bi-facial systems. Therefore PVsyst cannot propose any specific value in the present time. The value provided presently with the PVsyst results uses the definition of the Monofacial systems, so that the bi-facial gain comes as an increase of this ratio. NB: The main objective of the PR is to find an indicator for comparing real and simulated data, therefore which may easily be evaluated using simple (and "primary") measured data. However neither the rear side irradiance, nor the part of the bifacial gain is available in usual measurements." Source: https://forum.pvsyst.com/viewtopic.php?t=31 Best Regards, Nedal Nassar

Hello Javier Yes, until know the biracial performance ratio is calculated as the mono-facial. "PR for bifacial systems The definition of the performance ratio should be something like a standard, defined by an official instance, and accepted by everybody. Now I have not yet seen any reference which would define a performance ratio for bi-facial systems. Therefore PVsyst cannot propose any specific value in the present time. The value provided presently with the PVsyst results uses the definition of the Monofacial systems, so that the bi-facial gain comes as an increase of this ratio. NB: The main objective of the PR is to find an indicator for comparing real and simulated data, therefore which may easily be evaluated using simple (and "primary") measured data. However neither the rear side irradiance, nor the part of the bifacial gain is available in usual measurements." Source: https://forum.pvsyst.com/viewtopic.php?t=31 Best Regards, Nedal Nassar

Hello, I checked the hourly data results, and there are negative values for IAM loss (gain), how is that possible?

Hello, Is it okay to have difference between the Detailed IAM study and the results in the loss Diagram?