How exactly do they "support" generation? Do those "support" shingles cost more than 'regular' shingles?
Depending on the exact details, some or all of that cost could potentially qualify for the credit, especially because the seem to be a combined "system". This article may provide some insight on the your situation:
https://www.projectfinance.law/media/5398/taxnotes_taxcrediteligibility_jul16.pdf
