How does sunlight affect the longevity of SARS-CoV-2 on surface?
I have no data on SARS-CoV-2 specifically, but for SARS-CoV UV radiation is an effective method of eliminating viral infectivity:

Irradiation of UV for 60 min on the virus in culture medium resulted in the destruction of viral infectivity at an undetectable level.
CONCLUSION: The survival ability of SARS coronavirus in human specimens and in environments seems to be relatively strong. Heating and UV irradiation can efficiently eliminate the viral infectivity.


Stability of SARS coronavirus in human specimens and environment and its sensitivity to heating and UV irradiation., Biomedical and Environmental Sciences (2003)