pvlib.pvsystem.pvwatts_ac¶
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pvlib.pvsystem.
pvwatts_ac
(pdc, pdc0, eta_inv_nom=0.96, eta_inv_ref=0.9637)[source]¶ Implements NREL’s PVWatts inverter model [1].
\[\eta = \frac{\eta_{nom}}{\eta_{ref}} (-0.0162\zeta - \frac{0.0059}{\zeta} + 0.9858)\]\[P_{ac} = \min(\eta P_{dc}, P_{ac0})\]where \(\zeta=P_{dc}/P_{dc0}\) and \(P_{dc0}=P_{ac0}/\eta_{nom}\).
Note that the pdc0 is also used as a symbol in
pvwatts_dc()
. pdc0 in this function refers to the DC power input limit of the inverter. pdc0 inpvwatts_dc()
refers to the DC power of the modules at reference conditions.Parameters: - pdc (numeric) – DC power.
- pdc0 (numeric) – DC input limit of the inverter.
- eta_inv_nom (numeric, default 0.96) – Nominal inverter efficiency.
- eta_inv_ref (numeric, default 0.9637) – Reference inverter efficiency. PVWatts defines it to be 0.9637 and is included here for flexibility.
Returns: pac (numeric) – AC power.
References
[1] A. P. Dobos, “PVWatts Version 5 Manual,” http://pvwatts.nrel.gov/downloads/pvwattsv5.pdf (2014).