Hi Soheb,
The combination of negative NPV, unrealistically high IRR (or PPA price if running the model in Specify IRR target mode), and negative minimum DSCR value in the metrics table indicate that the project's financial assumptions are probably not realistic. I did a little investigating, but could not find the cause for this.
The project After-tax Cash Flow graph on the Summary tab of the Results page is a good place to start looking into issues like this. In your case, the initial investment is zero because of your assumption of 100% debt, and the annual project cash flows are negative, indicating that annual costs are higher than annual revenue:
The power prices are pretty low for a PV-Battery system, so it may just be that at those prices and given your other assumptions, the project is not feasible. I did an experiment setting the PPA price to $0.0025/kWh, effectively multilplying the hourly power prices by 2.5 with a debt fraction of 60% instead of 100%, and that resulted in an IRR of about 11% and NPV of about $2.5M.
In the process of my investigation, I did discover that some of the battery-related operating expenses are missing from the cash flow table. We will address that in the first update to SAM 2021.12.02:
github.com/NREL/SAM/issues/880.
Best regards,
Paul.