Dirint Application Problem

[thokpp]

Hello Guys,
I have a problem with the application of dirint which is :
-> Dirint not give me the right 'DNI' when i use it like this

=> dirint = pvlib.irradiance.dirint(ghi, zenith, times, pressure=dataframe['barometric_pressure'],
temp_dew=dataframe['temp_dew'])
(pressure is in Bar and Temperature in Celsius)
Whereas, erbs model gives me the right value for same data.
I don't understand why. If you can help me it will be nice and i will be very thanksfull.
Thank you for your reading guys =)

PS : Here is my first line of data :

<style> </style>

_time	air_temperature	barometric_pressure	Observed POA	irradiance_ghi	relative_humidity	apparent_zenith	zenith	apparent_elevation	elevation	azimuth	equation_of_time
2023-05-31 11:57:00+00:00	18,7799999	992,540002	84,54	50,8	98,8800003	84,2035451	84,349743	5,79645491	5,65025704	67,6589433	2,32497354

[cwhanse]

I think the barometric_pressure is in units of kPa, not Pa.

[thokpp]

Thank you, i have the sensation that's work for DNI but on my second line i would like to calculate DHI and this value is bugging too.
Do you have any idea which can help me ?
Thank you Hanse :)

[kandersolar]

Depending on how zenith was calculated, that could be a units issue as well; pvlib returns solar position angles in degrees while np.cos takes its argument in radians: https://numpy.org/doc/stable/reference/generated/numpy.cos.html

If zenith is in degrees, you can use np.cos(np.radians(zenith)). Or use dhi = pvlib.irradiance.complete_irradiance(zenith, ghi=ghi, dni=dirint), which does essentially the same thing.

[thokpp]

PS : for sure, i corrected kPa in Pa now =)