Losess

[Zahra]

Hello,

I am conducting an experimental study on the degradation of a Building-Integrated Photovoltaic (BIPV) system, which uses a single semitransparent Photovoltaic (STPV) module on a facade at a 90-degree tilt connected to an EcoFlow portable power station that functions as both the inverter and battery. I am seeking guidance on the most accurate way to model this setup in PVsyst, as I have several questions.

1. Wiring Losses: For a BIPV system with a single PV module connected to an inverter with a 3-meter wire, is it more accurate to model the wiring losses in PVsyst as global wiring resistance or as a loss fraction at STC?

2. Module Losses: I was also wondering how to obtain information for Light-Induced Degradation (LID), module quality, and module mismatch losses. Are these parameters typically provided in the module's datasheet, or are they found in specific research papers?

Thank you in advance for your guidance.

[Muhammed Sarikaya]

Dear Zahra,

If you know the exact global wiring resistance of your system and want a precise result, you can fill in the field "Global wiring resistance". Usually, the value for "Loss fraction at STC" is used when the exact global wiring resistance is unknown and you are just estimating it based on the STC value.

For module losses:

LID losses: Not applicable for PV modules based on n-dop wafers. You need to know the technology used in your PV module. Otherwise, we don’t have precise information regarding LID losses, since manufacturers don’t usually share this type of data. You can decide to add 1% or 2% depending on your confidence in the PV module. See our help page: https://www.pvsyst.com/help/project-design/array-and-system-losses/lid-loss.html

Module Quality: Please read our help page: https://www.pvsyst.com/help/project-design/array-and-system-losses/module-quality-losses.html

Module Mismatch Losses: Please also see our help page: https://www.pvsyst.com/help/project-design/array-and-system-losses/array-mismatch-losses/index.html
Usually, this is also an approximation, based on your assessment of the PV module quality and the variability between them.

Regards,