pvdeg.degradation.IwaArrhenius

pvdeg.degradation.IwaArrhenius(weather_df, meta, rh_outdoor, Ea, poa=None, temp=None, RHwa=None, Teq=None, p=0.5, n=1)

Function to calculate IWa, the Environment Characterization [W/m²]. For one year of degredation the controlled environmnet lamp settings will need to be set at IWa.

Parameters:

• weather_df (pd.dataframe) – Dataframe containing at least dni, dhi, ghi, temperature, wind_speed

• meta (dict) – Location meta-data containing at least latitude, longitude, altitude

• rh_outdoor (pd.series) – Relative Humidity of material of interest Acceptable relative humiditys include: rh_backsheet(), rh_back_encap(), rh_front_encap(), rh_surface_outside()

• Ea (float) – Degradation Activation Energy [kJ/mol]

• poa (pd.dataframe, optional) – must contain ‘poa_global’, Global Plan of Array irradiance [W/m²]

• temp (pd.series, optional) – Solar module temperature or Cell temperature [°C]

• RHwa (float, optional) – Relative Humidity Weighted Average [%]

• Teq (float, optional) – Temperature equivalent (Celsius) required for the settings of the controlled environment

• p (float) – Fit parameter

• n (float) – Fit parameter for relative humidity

Returns:

Iwa (float) – Environment Characterization [W/m²]