manufacturer parameter model

[mikeanderson-indavis@comcast.net kjads98a]

Hey folks,

Does anyone happen to know what paper these equations may have come from? 

I = Isc - C1 exp(-Voc/C2) [exp(V/C2) - 1]

C1 = (Isc - Imp)  / exp[(Vmp - Voc) / C2]

C2 = (Vmp - Voc) / LN(1 - Imp/Isc)

Thanks,

Mike

[cwh...@sandia.gov]

I believe that's the IV model in the AMETEK TerraSAS PV simulator. https://www.atecorp.com/ATECorp/media/pdfs/data-sheets/Elgar_TerraSAS_Datasheet.pdf

I don't know if it is derived in a paper somewhere.

Cliff

[Mike Anderson]

Thanks Cliff, yeah, that looks very similar. Here’s an image of the equations, in case that helps ring any bells (I wasn’t able to imbed it in the original post for so reason, hopefully it renders in this one). 

-Mike

On Jan 5, 2023, at 10:54 AM, 'cwh...@sandia.gov' via pvlib-python <pvlib-...@googlegroups.com> wrote:

I believe that's the IV model in the AMETEK TerraSAS PV simulator. https://www.atecorp.com/ATECorp/media/pdfs/data-sheets/Elgar_TerraSAS_Datasheet.pdf

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[cwh...@sandia.gov]

Those equations don't look quite right, because C1 simplifies to just Isc, which is surprising if that's what the authors intended.

This 2008 conference paper https://www.researchgate.net/publication/224605112_Simplified_model_of_a_photovoltaic_module

has something similar, and a reference to a 2004 paper that I can't get to at the moment.

[Mike Anderson]

Good eye Cliff, I hadn’t noticed that. 

Disregard this request. 

-Mike

On Jan 6, 2023, at 11:54 AM, 'cwh...@sandia.gov' via pvlib-python <pvlib-...@googlegroups.com> wrote:



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[Anton Driesse]

It is indeed a bit strange that C1 simplifies to Isc.  I guess it just went unnoticed when someone rearranged the equations from the 2008 paper, but it doesn't prevent the equations from producing IV curves.

Anton

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