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Performance Ratio for Bifacial modules


Douglas
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Hi,

I'm designing a smaller ground based project and are currently investigating the option of bifacial vs monofacial modules. But what I don't understand is how the PR value is calculated for bifacial systems. I noticed that the PR is less for some of the bifacial systems compared to identical monofacial systems. 

When calculating the PR manually I use this equation: PR  = ("PV energy (AC) minus standby use") / ("Global Radiation at the Module" - "Reflection on the Module Interface") * module area * module efficiency )) 

But it doesn't match the PR when calculated manually for bifacial systems compared to what is presented in the report. How can I calculate the PR manually for Bifacial systems?

 

Hope to hear from you soon,
Douglas

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  • 1 month later...

Hi Douglas,

please excuse the late answer. I just checked the calculation of the PR of bifacial modules in PV*SOL and couldn't find an error. Could you send the project where the manually calculated PR and the PR from PV*SOL differ? Just a small hint (but I don't think this leads to the problem): The brackets in your formula should be replaced like so:

PR  = ("PV energy (AC) minus standby use") / (("Global Radiation at the Module" - "Reflection on the Module Interface") * module area * module efficiency ) 

Kind regards,

Martin

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