captest.prtest.perf_ratio
- captest.prtest.perf_ratio(ac_energy, dc_nameplate, poa, unit_adj=1, degradation=0, year=1, availability=1)
Calculate performance ratio.
- Parameters:
ac_energy (Series) – Measured energy production (Wh) from system meter.
dc_nameplate (numeric) – Summation of nameplate ratings (W) for all installed modules of system under test.
poa (Series) – POA irradiance (W/m^2) for each time interval of the test.
unit_adj (numeric, default 1) – Scale factor to adjust units of ac_energy. For exmaple pass 1000 to convert measured energy from kWh to Wh within PR calculation.
degradation (numeric, default None) – Apply a derate (percent, Ex: 0.5%) for degradation to the expected power (denominator). Must also pass specify a value for the year argument. NOTE: Percent is divided by 100 to convert to decimal within function.
year (numeric) – Year of operation to use in degradation calculation.
availability (numeric or Series, default 1) – Apply an adjustment for plant availability to the expected power (denominator).
- Returns:
Instance of class PrResults.
- Return type: