PPA for BESS + PV

  • Emilio Corral
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04 Nov 2022 16:19 #11655 by Emilio Corral
Replied by Emilio Corral on topic PPA for BESS + PV
Hi Paul,

Thanks for the reference.

What I understood is that the reflection losses will be calculated automatically by SAM depending on factors like tilt, type of module and reference, location, weather, etc.

How can I see a change in the reflection losses maintaining the module selected, weather, and tilt? Is there any other variable?

Best Regards,

Rafael

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  • Paul Gilman
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07 Nov 2022 22:53 #11663 by Paul Gilman
Replied by Paul Gilman on topic PPA for BESS + PV
Dear Rafael,

SAM's Detailed Photovoltaic model reports the "Reflection (IAM)" loss in the results, which you can see on the Losses tab of the results page, and also as a number on the Data Tables tables tab.

Best regards,
Paul.

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  • Emilio Corral
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09 Nov 2022 15:22 #11670 by Emilio Corral
Replied by Emilio Corral on topic PPA for BESS + PV
Hi Paul,

I hope your week is going well so far!

For the 2 MW / 2 hours BESS and PV of 1.56 MW, I'm not able to get the BESS to discharge.
It's showing 100% roundtrip efficiency and in the cash flow tables it doesn't show that it discharges, as well as in the graphs.

It only shows discharge if I use the manual discharge.

Can you please assist?

I look forward to hearing from you.

Best Regards,

Rafael

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  • Paul Gilman
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10 Nov 2022 00:18 #11673 by Paul Gilman
Replied by Paul Gilman on topic PPA for BESS + PV
Hi Rafael,

Please send me a copy of a .sam file showing the battery not discharging so I can help you troubleshoot.

Best regards,
Paul.

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  • Emilio Corral
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10 Nov 2022 18:20 #11679 by Emilio Corral
Replied by Emilio Corral on topic PPA for BESS + PV
Hi Paul,

I understood from the HELP, that when using the "Automatic Dispatch" the BESS won't discharge, since the PPA rate maintains the same.

I changed it to manual, and started seeing some discharge.
I also used the PV Smoothing option, and had another option.

See attached the file for your overall review.

Thanks,

Rafael
Attachments:

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  • Paul Gilman
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12 Nov 2022 23:07 #11684 by Paul Gilman
Replied by Paul Gilman on topic PPA for BESS + PV
Hi Rafael,

The battery in the "Nexans PV + BESS Manual" case does not dispatch with the Automated Dispatch option because of the cycle degradation penalty on the Battery Dispatch page, which is relatively high at $0.1/cycle-kWh. If you change the cycle degradation penalty option from "Enter penalty" to "Calculate automatically", you will see in the results that SAM calculates a maximum penalty of about $0.009/cycle-kWh. I tried the "Enter penalty" option with a value of $0.01/cycle-kWh, and the battery did dispatch.

Best regards,
Paul.

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