No, there is no credit available to you since the solar panels were installed in a prior year.
According to the IRS Instructions for Form 5695 Residential Energy Credits, "costs are treated as being paid when the original installation of the item is first completed". In your case, the cost of installation of the solar panels occurred prior to 2021. The 2021 energy credit is based on the costs of installation that occur in the tax year 2021.
For reference, here is a link to the IRS instructions: Instructions Form 5695
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