solar panels in primary residence with office in home

Installed in 2019.  I am aware of the percent usage rule.

Please clarify.  These are items I have read about solar panels

(1) basis of solar panel for depreciation  (cost minus 50% of the 30% solar tax credit)?

(2)  Depreciable Life of the panels:   5 years, or 39 (same as residence)?

(3)  How to enter in turbo tax (Add as a depreciable asset in OIH)?

 

Thank you.