pvlib.pvsystem.pvwatts_ac

pvlib.pvsystem.pvwatts_ac(pdc, pdc0, eta_inv_nom=0.96, eta_inv_ref=0.9637)[source]

Implements NREL’s PVWatts inverter model [R26].

\[\eta = \frac{\eta_{nom}}{\eta_{ref}} (-0.0162\zeta - \frac{0.0059}{\zeta} + 0.9858)\]
\[P_{ac} = \min(\eta P_{dc}, P_{ac0})\]

where \(\zeta=P_{dc}/P_{dc0}\) and \(P_{dc0}=P_{ac0}/\eta_{nom}\).

Parameters:

pdc: numeric

DC power.

pdc0: numeric

Nameplate DC rating.

eta_inv_nom: numeric

Nominal inverter efficiency.

eta_inv_ref: numeric

Reference inverter efficiency. PVWatts defines it to be 0.9637 and is included here for flexibility.

Returns:

pac: numeric

AC power.

References

[R26](1, 2) A. P. Dobos, “PVWatts Version 5 Manual,” http://pvwatts.nrel.gov/downloads/pvwattsv5.pdf (2014).