Different SAM versions creating different generation profiles despite all

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Joel Bulow
Topic Author

27 Jan 2021 06:43 #9239 by Joel Bulow

Different SAM versions creating different generation profiles despite all was created by Joel Bulow

Hi!
I have recently updated my SAM from 2017.9.5 to 2020.11.29. I have set up the PV_fixed model with the EXACT same inputs in both of the projects, with more or less than exact same .lk script (despite some syntax updates). However, when I run the script to calculate the AC capacity factor and generation profiles, the old version of SAM 2017.9.5 gives me a higher AC capacity (sometimes 5% higher!) and generation output than the new 2020.11.29 version. I was wondering if something changed between updates which means I should expect this difference between versions despite all other conditions being the same?

Thanks for your help!
Joel

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Paul Gilman

27 Jan 2021 22:52 #9241 by Paul Gilman

Replied by Paul Gilman on topic Different SAM versions creating different generation profiles despite all

Hi Joel,

There have been three new versions since SAM 2017.9.5, so I would expect there to be some differences between the PV models in those versions. You can review the release notes to see what improvements have been made between versions:

nrel.github.io/SAM/doc/releasenotes.html

If you have a file you would like to share that shows this difference between versions, please post it and I will investigate.

Best regards,
Paul.

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