PV-Battery bill-savings results change every time I click simulate

I'm working on simulating a PV-Battery, TPO Host-Developer project and I've noticed that the "Electricity bill with System $/mo" results change every time I click simulate, even though I'm not changing and any inputs.

In the screenshots you can see the impact by the change on the host metrics.

Is there a reason why this should/could be happening? 

Hi Jackson,

This appears to be a bug with the electricity bill calculator for SAM 2023.12.17: github.com/NREL/SAM/issues/1676

I would recommend using SAM 2022.11.21 until we resolve this issue.

You can model the "self-consumption" battery dispatch option in SAM 2022.11.21 with "Price signal forecast" (renamed "Retail rate dispatch" in SAM 2023.12.17) and setting the grid interconnetion limit on the Grid Limits page to zero.

Best regards,
Paul.
 

Hi Paul, thank you!! This seems to have been updated in the latest patch release of SAM. Any word when these updates will be coming to PySAM? My use-case relies on it.

Hi Jackson,

We are working on the PySAM update -- it's taking some time to work through a few issues, but it should be up soon.

Thanks for your patience.

Best regards,
Paul.