I am not sure why pytest is failing on windows-latest 3.9

I am not sure why pytest is failing on windows-latest 3.9

Ignore that one, it's failing on all branches the last day or two.

PVsyst does not object to adding this capability to pvlib. They emphasize that they will not provide technical support for pvlib users.

That is very nice and also reasonable of them.

I compared the results of reading the two PAN files (one binary, one text) that @williamhobbs provided in #2504 and found the following potential errors:

• Source may be missing the final character (W Hobb vs W Hobbs)
• Year's value is 'Si'?
• Cells_In_Series and Cells_In_Parallel perhaps ought to be converted from str to int
• CellArea is -9984.00000089407?
• Isc, muIsc, etc are slightly off, somehow. more than you'd expect even for single-precision floats
• Rshunt: 300 instead of 500?
• no gamma, mu_gamma?

Another thing: neither file has an IAM profile, which means a big chunk of code is not being exercised. I wonder if we could lean a bit more on @williamhobbs's goodwill to produce a file with an IAM profile?

One more thing: I bet the struct module offers a succinct replacement for the verbose bit-fiddling parts of this code.

@kandersolar, here are two more sample .pan files in a .zip. One had the option to be compatible with versions < 6.40 selected, the other without. I enabled IAM and added module dimensions, plus a few other changes. Let me know if screenshots to confirm inputs would help, or if you have other feedback/suggestions.

samples3.zip