Solar Loan Interest - Non-Secured Loan - Deductible for 2019?

Just want to be sure.  I have a credit union loan that is exclusively for a solar system that was installed in 2019 atop my primary residence.  The loan is not secured by the home.  I paid almost $1,500 in interest tis past year.  Despite not being secured, there is talk here in California that since this loan is for the improvement of my primary residence, that the interest is in fact deductible.  Has something changed?  Can I now deduct the interest on my Federal and/or State (California) returns?