The solar tax credit is a nonrefundable tax credit, which means you will not get a tax refund for the amount of the tax credit that exceeds your tax liability. However, you can carry over any unused amount of the tax credit to the following tax year.
https://www.energy.gov/sites/default/files/2021/02/f82/Guide%20to%20Federal%20Tax%20Credit%20for%20R...
**Answers are correct to the best of my ability but do not constitute tax or legal advice.
