Hi Vikram,
There is not an explicit line item on the System Costs page for a bi-directional inverter that would be required for an AC-coupled battery, so you should be sure to include it as appropriate for your analysis. You can choose an appropriate category for the cost, perhaps as part of the inverter cost, or of the balance of system cost.
For information about battery costs, see
sam.nrel.gov/battery-storage/battery-cost-data.
Note that the default costs in SAM are illustrative only, so you should review the costs for your analysis. The costs also do not change as you change the design of your system. So, for example, if you change the tracking option for a photovoltaic system from fixed to one-axis tracking, the installation and operating costs do not automatically change. Similarly, for the financial assumptions, if you change the location, the tax and incentive assumptions do not change automatically.
Best regards,
Paul.