The SAM web site will be upgrading Monday, May 23 from 4:00-5:00pm (Denver/mountain time). 

After doing a major change to our infrastructure, we have found a minor issue that we have corrected but will need to reboot the web site for it to take affect.

To make it as convenient as possible, we have scheduled it for Monday, May 23rd at 4:00pm (mountain). The process takes 15-20 minutes, but the site will only be unavailable for a short time. However, your session information will be lost (eg if you're writing a post, what you have written could be lost). 

SAM's default battery cost values were chosen to be roughly representative of battery costs for a project in the United States to help you get started using the model. You should review and change those costs for your own analysis.

Default battery costs are from the NREL Annual Technology Baseline.

For additional information about battery storage costs, see the following publications:

Feldman, D.; Ramasamy, V.; Fu, R.; Ramdas, A.; Desai, J.; Margolis, R. (2021). U.S. Solar Photovoltaic System and Energy Cost Benchmark: Q1 2020. NREL/PR-6A20-78882. (PDF 4.6 MB)