Problems while running the feedin function

[goncasado6]

Hello, after I have done correctly all the previous steps of the weather and setting up the photovoltaic object(which work correctly), when I do the calculate the feedin part it doesnt work, it appears two errors and I dont know why.
Please reply me if you know the error and what I have to do,
Thank you

[GregorBecker]

I think the error described results from the issue #62 opened by @uvchik.

It is possible using the deprecated standard of pvlib version 0.0.9 if the module_type is set to "glass_glass" and the racking_model is set to "open_rack" while initiating the poweplants.Photovoltaic class. The other possible types can be found in the temperature.py of pvlib-python (https://github.com/pvlib/pvlib-python/blob/master/pvlib/temperature.py).

[jesuspolo]

I have the same problem, I think that it refers to the King temperature model in pvlib that needs a, b and deltaT parameters, but I'm not able to input these parameters properly to feedinlib

[uvchik]

Did you try to use pvlib v0.8.x instead of v0.9.x or higher?

[Ludee]

Downgrading pvlib to v0.8.1 is an option, but not a good one.

I am currently trying to update an existing pv model to 0.9.1 but I'm having a hard time with different errors.
The documentation and release notes are only helping a bit.
I will post what I found out here.
I also opened a discussion on the pvlib GitHub

- temperature model

from pvlib.temperature import TEMPERATURE_MODEL_PARAMETERS
tm_gg = TEMPERATURE_MODEL_PARAMETERS['sapm']['open_rack_glass_glass']
tm_gp = TEMPERATURE_MODEL_PARAMETERS['sapm']['open_rack_glass_polymer'] 

-> see https://pvlib-python.readthedocs.io/en/stable/_modules/pvlib/temperature.html
gg={'a': -3.47, 'b': -.0594, 'deltaT': 3}
gp={'a': -3.56, 'b': -0.075, 'deltaT': 3}

- PVSystem

module_type='glass_glass', # 'glass_polymer'
racking_model='open_rack',

[uvchik]

Downgrading pvlib to 0.8.x is meant as a workaround not as a solution.

@Ludee Did you take a look at PR #73

[Ludee]

Yes, I already had a look at the PR.
Not sure if the temperature_module_parameters is required or only additional?

[GregorBecker]

If you set module type and racking model when initializing the PV plant, the temperature model parameters are obtained from the dictionary in pvlib's temperature.py. To set these values (a, b, delta T) from the feedinlib is difficult at first sight.

Without setting the parameters the pv plant cannot be initialized.