PV Variables and Terms#
pvdeg aims to use the following variables and parameters in its codebase and documentation whenever possible. Please use these conventions when contributing.
Stressor Parameters#
Input Variable |
Description |
Units |
|---|---|---|
T_k |
temperature |
[K] |
T |
temperature |
[C] |
G |
Irradiance |
[W/m^2] |
G_UV |
UV Irradiance |
[W/m^2`] |
G_340 |
UV Irradiance |
W/m^2/nm |
G_pyr |
W/m^2 |
UV Irradiance |
G_550 |
UV Irradiance |
Photons*m^-2*s^-1 |
TOW |
Time of Wetness |
[h/{year}] |
RH |
Relative Humidity |
[%] |
FF_0 |
Initial Fill Factor |
[%] |
L |
Lambda (Wavelength) |
[mm] |
Q |
Quantum Yield |
|
BPT_K |
Black Pannel Temperature |
[K] |
Modeling Constants#
Variable |
Definition |
|---|---|
R_0 |
Frequency factor, prefactor, |
R_D |
Rate of degradation |
E_a |
Activation Energy |
t_fail |
embrittlement time |
A |
prefactor |
FF |
Fill Factor |
B |
Beta |
E |
Epsilon |
v_ab |
LeTID prefactor, attempt frequency from state A to B |
v_bc |
LeTID prefactor, attempt frequency from state A to B |
v_ba |
LeTID prefactor, attempt frequency from state A to B |
v_cb |
LeTID prefactor, attempt frequency from state A to B |
E_(a, ab) |
LeTID Activation energy from state A to B |
E_(a, bc) |
LeTID Activation energy from state B to C |
E_(a, ba) |
LeTID Activation energy from state B to A |
E_(a, cb) |
LeTID Activation energy from state C to B |
x_ab |
LeTID Excess Carrier Density Exponent |
x_bc |
LeTID Excess Carrier Density Exponent |
x_ba |
LeTID Excess Carrier Density Exponent |
A_T |
Temperature prefactor |
A_UV |
UV prefactor |
A_RH |
RH prefactor |
LE |
Life Expectation |
da |
E of lambda |