pvlib.pvsystem.pvwatts_dc

pvlib.pvsystem.pvwatts_dc(g_poa_effective, temp_cell, pdc0, gamma_pdc, temp_ref=25.0)[source]

Implements NREL’s PVWatts DC power model [1]:

\[P_{dc} = \frac{G_{poa eff}}{1000} P_{dc0} ( 1 + \gamma_{pdc} (T_{cell} - T_{ref}))\]
Parameters:
g_poa_effective: numeric

Irradiance transmitted to the PV cells in units of W/m**2. To be fully consistent with PVWatts, the user must have already applied angle of incidence losses, but not soiling, spectral, etc.

temp_cell: numeric

Cell temperature in degrees C.

pdc0: numeric

Nameplate DC rating.

gamma_pdc: numeric

The temperature coefficient in units of 1/C. Typically -0.002 to -0.005 per degree C.

temp_ref: numeric, default 25.0

Cell reference temperature. PVWatts defines it to be 25 C and is included here for flexibility.

Returns:
pdc: numeric

DC power.

References

[1](1, 2) A. P. Dobos, “PVWatts Version 5 Manual” http://pvwatts.nrel.gov/downloads/pvwattsv5.pdf (2014).