pvlib.pvsystem.i_from_v¶

pvlib.pvsystem.i_from_v(resistance_shunt, resistance_series, nNsVth, voltage, saturation_current, photocurrent)[source]¶

Calculates current from voltage per Eq 2 Jain and Kapoor 2004 [1].

Parameters:

resistance_shunt : float or Series

Shunt resistance in ohms under desired IV curve conditions. Often abbreviated Rsh.

resistance_series : float or Series

Series resistance in ohms under desired IV curve conditions. Often abbreviated Rs.

nNsVth : float or Series

The product of three components. 1) The usual diode ideal factor (n), 2) the number of cells in series (Ns), and 3) the cell thermal voltage under the desired IV curve conditions (Vth). The thermal voltage of the cell (in volts) may be calculated as k*temp_cell/q, where k is Boltzmann’s constant (J/K), temp_cell is the temperature of the p-n junction in Kelvin, and q is the charge of an electron (coulombs).

voltage : float or Series

The voltage in Volts under desired IV curve conditions.

saturation_current : float or Series

Diode saturation current in amperes under desired IV curve conditions. Often abbreviated I_0.

photocurrent : float or Series

Light-generated current (photocurrent) in amperes under desired IV curve conditions. Often abbreviated I_L.

Returns:

current : np.array

References

[1] A. Jain, A. Kapoor, “Exact analytical solutions of the parameters of real solar cells using Lambert W-function”, Solar Energy Materials and Solar Cells, 81 (2004) 269-277.