Shunt resistance exponent

What it is

The exponent that sets how fast the shunt resistance falls from its dark value to its reference value as the irradiance rises.

Typical values and how to get it

5.5 unless the PAN file says otherwise.

How it is applied

$$R_{\text{sh}}(G) = R_{\text{sh,base}} + \left(R_{\text{sh,0}} - R_{\text{sh,base}}\right) e^{-c_{sh}\,G/G_{\text{ref}}}, \qquad R_{\text{sh,base}} = \frac{R_{\text{sh,ref}} - R_{\text{sh,0}}\,e^{-c_{sh}}}{1 - e^{-c_{sh}}}$$

where

Symbol	Meaning	Unit
$R_{\text{sh}}(G)$	the shunt resistance at irradiance $G$	Ω
$R_{\text{sh,base}}$	the value the law approaches at high irradiance	Ω
$R_{\text{sh,0}}$	the shunt resistance at zero irradiance, from the module file (Shunt resistance at zero irradiance)	Ω
$c_{sh}$	this input	—
$G$	the effective irradiance on the module	W/m²
$G_{\text{ref}}$	the reference irradiance	W/m²
$R_{\text{sh,ref}}$	the shunt resistance at the reference irradiance, from the module file (Shunt resistance at reference irradiance)	Ω

References

1. Mermoud & Lejeune 2010, Performance assessment of a simulation model for PV modules of any available technology, 25th European Photovoltaic Solar Energy Conference

API

module.r_sh_exp

Symbols follow the symbol registry.