Most tax payers are cash basis. This means you incur a deductible expense when it is paid and not based on a promise (credit). If you pay for installation in 2022 you will be able to take the credit in 2022.
If you have a carryover from the residential energy credit, use Form 5695 to take any residential energy efficient property credit carryforward from 2022 or to carry the unused portion of the credit to 2023.
The energy efficiency tax credit is technically "non-refundable" which means at the end of the year, you can't get back more in credits than you paid to the government in taxes throughout the year. If you are unable to claim the entire percentage of your purchase for the above products in one year, you can carry forward the unclaimed portion to future years.
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