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different results when running example notebook

See original GitHub issue

I’m just getting started with rdtools and trying to reproduce the results of the example notebook.

https://github.com/NREL/rdtools/blob/master/docs/degradation_example.ipynb

The notebook seems to run fine (apart from needing to install the tables library, already pointed out in https://github.com/NREL/rdtools/issues/86, but easy to fix).

However, despite running smoothly, I am getting quite different results than what’s listed online. See attachment at bottom for what I’m getting.

Any thoughts on why this might be? I want to make sure everything is being done correctly before trying this on new data sets.

Some notes:

I am on Mac OS/X, Py 3.6.4
I installed pvlib (today) by cloning the github repo, then running “python setup.py develop”
I installed rdtools (today) by the same procedure

notebook_executed.pdf

Issue Analytics

State:
Created 5 years ago
Comments:5

Top GitHub Comments

2reactions

cdelinecommented, Sep 27, 2018

Confirmed - this has a root cause of the raw data download from DKCAS ‘84-Site_12-BP-Solar.csv’ apparently having changed. When I re-download the raw data, the sensor-based degradation drops from -0.75% / yr to -0.43%/yr, matching the above. Clear-sky results are unchanged, so I suspect that an error in DKCAS’ measured ghi or dhi was found and now corrected. Note the apparent drop in 2017 normalized energy that is no longer present.