How to properly simulate the REC Twinpeak module's Electrical Effect?

[sdhauserREC]

Hello,

REC makes a module with a unique cell architecture which is coined the twin peak. For the 72-cell format, it is essentially (2) half-cut 72-cell modules wired in parallel, in the dimensions of a standard 72-cell module. This could provide an advantage when the bottom half of the module is fully shaded, the module still produces 50 percent of the Wp power from the top half..

I am trying to simulate the electrical effect of the shade impact of interrow shading in single axis trackers w/ backtracking turned off... i.e. late in the day there very bottom row of cells would be shaded. My question would be, what percent for the electrical effect should I select?