Rear Side current for Bifacial module

[Ishan31]

Hi,

I am trying to understand the Bifacial gain for my system in terms of electrical output for each string. The simulation results gives me  I (Array) which i think is total Imp of plant both including front and rear contribution and not on string level. I understand PVsyst follow one diode model for Bifacial module but still is there any way PVsyst providing the value of this rear side and front side Imp separately for each string.

[Linda Thoren]

Hello,

The most straightforward way to evaluate bifacial gain is to run two simulations: one with bifacial parameters activated and one without. While the current itself does not differ between the front and rear sides, the rear side does contribute to the overall energy production. In PVsyst, the results are presented for the entire system and not broken down per string.

[Ishan31]

Hi Linda,

Thanks for the response. The requirement arises in order to optimally size no. of strings to MPPT of central inverter while complying to maximum current limitation of MPPT. Since the rear side current in bifacial is highly variable parameter I wanted use PVsyst to get fair estimation of it so that MPPT can loaded  optimally, avoiding clipping losses. Can you suggest some solution here?

Also can we find the single string current from IArray with total no. of strings

[Linda Thoren]

Hello,

I suggest that you run a simulation with the bifacial parameters and export an hourly output file with all the relevant parameters, such as overload losses etc. This can not be done for individual strings but for the full system. 

Running several iterations should give you a good estimate of the losses.