This is at best a confusing situation. The first question is "this your primary home", a "second home", or a "rental property", and what form of trust are you talking about.
The best guide I've found is:
https://www.thetaxadviser.com/newsletters/2017/oct/credit-residen[product key removed]s.html
https://recsolar.com/blogs/calculate-solar-tax-credit-2020/
"Business credit
While Sec. 25D does not allow a solar tax credit for the cost of installing solar panels for use in residential rental property, Sec. 48 is more favorable. Sec. 48 provides for a solar energy tax credit for the installation of solar panels as part of the general business credit under Sec. 38. Under Sec. 48(a)(5)(D)"
"Sec. 48(a)(3)(A)(i) defines equipment that uses solar energy to generate electricity or to heat or cool a structure as energy property, as long as it is not used to heat a swimming pool."
Which appears to lead to use of form 3468 and form 3000 to report a Investment Tax Credit for solar for a trust
https://www.irs.gov/pub/irs-pdf/f3468.pdf
