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.