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PR calculation with bifacial modules
https://forum.pvsyst.com/viewtopic.php?f=25&t=3145
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Author:  lonav [ Wed Sep 20, 2017 12:03 pm ]
Post subject:  PR calculation with bifacial modules

Hi,

I have been running some simulations with bifacial modules and it caughts my attention the fact that the performance ratio calculation does not take into account the global in-plane irradiation on the rear side of the module. Should not it be added to the calculation to comply with the PR definition?

Thank you in advance for the help.

Best,

Author:  André Mermoud [ Thu Sep 21, 2017 8:36 pm ]
Post subject:  Re: PR calculation with bifacial modules

This is a question of definition.
I don't know if there is an official answer, but due to the difficulty of evaluating the rear side irradiance, I really doubt that this is a good idea.

Author:  Javier_SA [ Wed Feb 12, 2020 1:09 am ]
Post subject:  Re: PR calculation with bifacial modules

Hi André,

Is that a good question some years later? Is the Bifacial Performance Ratio still calculated as the monofocial one?

Thank you,

Javier.

Author:  nassar [ Wed Apr 08, 2020 5:31 am ]
Post subject:  Re: PR calculation with bifacial modules

Quote:
Hi André,

Is that a good question some years later? Is the Bifacial Performance Ratio still calculated as the monofocial one?

Thank you,

Javier.
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: viewtopic.php?t=31

Best Regards,
Nedal Nassar

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