Mismatch loss factor (rear side)

What it is

The mismatch loss applied to the rear-side share of the array power. The rear side of a row is lit unevenly, so its contribution carries more mismatch than the front.

Typical values and how to get it

A common design range is 5 to 10 %; the default is 10 %.

How it is applied

$$P_{\text{loss}}(t) = f_{\text{rm}}\,\frac{G_{\text{back}}}{G_{\text{front}} + G_{\text{back}}}\,P_{arr}(t)$$

where

Symbol	Meaning	Unit
$P_{\text{loss}}(t)$	the rear mismatch loss of the timestep	W
$f_{\text{rm}}$	this input as a fraction	—
$G_{\text{back}}$	the rear irradiance times the bifaciality factor	W/m²
$G_{\text{front}}$	the front effective irradiance	W/m²
$P_{arr}(t)$	the array DC power after the quality, light-induced degradation, light-soaking and mismatch derates	W

API

bifacial.rear_mismatch_loss — sent as a fraction 0–1

Symbols follow the symbol registry.