Demand Charge Issue

Alvaro
Topic Author

13 Jun 2024 08:53 #13254 by Alvaro

Demand Charge Issue was created by Alvaro

Hi!Could you help me with the following error:

File Attachment:

File Name: PV + BESS.sam
File Size:129 KB

File Attachment:

File Name: PV + BESS.sam
File Size:129 KB

Code:

exec fail(lib_utility_rate_equations): Demand rate Period 0 not found for Month 0. Simulation battery failed: exec fail(lib_utility_rate_equations): Demand rate Period 0 not found for Month 0.

I am trying to make the model prioritize battery discharge when energy is more expensive. I have already uploaded the price profile, and it works fine, but when I add the demand charges, this error appears. Do you know what it could be?

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Paul Gilman

13 Jun 2024 17:11 #13256 by Paul Gilman

Replied by Paul Gilman on topic Demand Charge Issue

Hi Alvaro,

This appears to be a bug with the Retail Rate battery dispatch option that we fixed for the next update to SAM 2023.12.17, which we plan to release in early July 2024. My colleagues are investigating, and I will follow up when I hear from them.

The way the demand charge rates are set up in the file you attached, there are no demand charges, so I think you can work around the bug by disabling the demand charges.

Best regards,
Paul.

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Paul Gilman

14 Jun 2024 15:01 #13263 by Paul Gilman

Replied by Paul Gilman on topic Demand Charge Issue

Hi Alvaro,

This is a known issue that we have fixed for SAM 2023.12.17 r2, which we hope to release in early July 2024.

github.com/NREL/ssc/pull/1152

Best regards,
Paul.

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