pvlib.pvsystem.calcparams_pvsyst¶

pvlib.pvsystem.calcparams_pvsyst(effective_irradiance, temp_cell, alpha_sc, gamma_ref, mu_gamma, I_L_ref, I_o_ref, R_sh_ref, R_sh_0, R_s, cells_in_series, R_sh_exp=5.5, EgRef=1.121, irrad_ref=1000, temp_ref=25)[source]¶

Calculates five parameter values for the single diode equation at effective irradiance and cell temperature using the PVsyst v6 model described in [1,2,3]. The five values returned by calcparams_pvsyst can be used by singlediode to calculate an IV curve.

Parameters:

effective_irradiance : numeric: The irradiance (W/m2) that is converted to photocurrent.
temp_cell : numeric: The average cell temperature of cells within a module in C.
alpha_sc : float: The short-circuit current temperature coefficient of the module in units of A/C.
gamma_ref : float: The diode ideality factor
mu_gamma : float: The temperature coefficient for the diode ideality factor, 1/K
I_L_ref : float: The light-generated current (or photocurrent) at reference conditions, in amperes.
I_o_ref : float: The dark or diode reverse saturation current at reference conditions, in amperes.
R_sh_ref : float: The shunt resistance at reference conditions, in ohms.
R_sh_0 : float: The shunt resistance at zero irradiance conditions, in ohms.
R_s : float: The series resistance at reference conditions, in ohms.
cells_in_series : integer: The number of cells connected in series.
R_sh_exp : float: The exponent in the equation for shunt resistance, unitless. Defaults to 5.5.
EgRef : float: The energy bandgap at reference temperature in units of eV. 1.121 eV for crystalline silicon. EgRef must be >0.
irrad_ref : float (optional, default=1000): Reference irradiance in W/m^2.
temp_ref : float (optional, default=25): Reference cell temperature in C.

Returns:

Tuple of the following results:
photocurrent : numeric: Light-generated current in amperes
saturation_current : numeric: Diode saturation current in amperes
resistance_series : float: Series resistance in ohms
resistance_shunt : numeric: Shunt resistance in ohms
nNsVth : numeric: The product of the usual diode ideality factor (n, unitless), number of cells in series (Ns), and cell thermal voltage at specified effective irradiance and cell temperature.