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47% IAM factor Losses using Scandia Model
https://forum.pvsyst.com/viewtopic.php?f=25&t=3700
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Author:  linkeshd [ Fri Aug 24, 2018 6:41 pm ]
Post subject:  47% IAM factor Losses using Scandia Model

Dear fellow PVSyst users,

I recently was surprized by some very large loss factors when using Boviet 6612P 320 Optimized modules, as shown:
Attachment:
File comment: Crazy Big IAM Factor Losses
2018-08-24_12-35-56.png
2018-08-24_12-35-56.png [ 28.1 KiB | Viewed 1843 times ]
Investigating the IAM curve, the Scandia curve looks really strange:
Attachment:
File comment: Scandia Lab's IAM factor versus others
2018-08-24_12-33-09.png
2018-08-24_12-33-09.png [ 25.34 KiB | Viewed 1843 times ]
In general, I thought that the Scandia model was experimentally confirmed. Is this the case? Has anyone seen this before? What would you consider a reasonable approach to this?

Thank you,
Link

Author:  AndrĂ© Mermoud [ Tue Aug 28, 2018 11:42 pm ]
Post subject:  Re: 47% IAM factor Losses using Scandia Model

I really don't understand how you got this result.
The Sandia model is hard-coded in PVsyst, the values are unmodifiable and give a result very close to the normal Fresnel's model.

This curve is probably a user-defined IAM profile, specified in your PV module, with completely erroneous parameters.
Attachment:
File comment: Sandia model and Fresnel, normal glass and with AR-coating
IAM_SandiaModel.png
IAM_SandiaModel.png [ 18.29 KiB | Viewed 1803 times ]

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