No you cannot take the solar credit on a rental property.
IRS Form 5695, Residential Energy Credit instructions - https://www.irs.gov/pub/irs-pdf/i5695.pdf
Who Can Take the Credit
You may be able to take the credit if you made energy saving improvements to your home located in the United States in 2018.
Home. A home is where you lived in 2018 and can include a house, houseboat, mobile home, cooperative apartment, condominium, and a manufactured home that conforms to Federal Manufactured Home Construction and Safety Standards.
