Pnom ratio,Overload Loss in Bifacial Module

[Ishan31]

Hi,

While working with Bifacial module ,the system sizing in PVsyst is considering only the front side side parameter ( Neglecting Imp due to rear side) to calculate the string sizing, Inverter overload losses and Pnom ratio.I understand that bifacial gain highly variable outcome but under certain conditions rear side contribution would lead to higher overload loss and Pnom values.I want to understand how PVsyst is considering the bifacial outcome in system sizing.

[Linda Thoren]

Hello,

The values used in the system sizing serve only as a guideline and provide an order-of-magnitude estimate, considering only the initial front-side production (excluding for instance losses and rear-side generation). For an accurate assessment of overload losses, you should run a simulation. 

[Ishan31]

@Linda Thoren I clearly understand in terms of overload loss. However Inverter has limitation in terms of maximum current per MPPT and since the string sizing is only based on the front side Imp ,I guess the string distribution along MPPT has to be evaluated separately?

 

 

[Linda Thoren]

the idea is the same for the limitation of maximum current per MPPT. The graphics in the system window is an approximation, not considering the backside production, though the simulation will.