They are as good for resale as a swimming pool.
Some buyers don't mind while other say 'Absolutely not!'
In Florida owners are PROHIBITED from selling electricity they produce. Only Florida power companies can sell electricity. That means there can be no 'selling to the grid' benefits, no income producing potential. The consequence? In Florida, the SUNSHINE STATE, solar is an unwanted orphan.
That leaves only the utility saving benefit as the tangible and the intangible being 'Save the Planet' mission and possible qualification to membership in the Sierra Club and Audubon Society.
Will saving 60% on the electricity bill compensate for those warts on the roof?
Are those warts a badge of honor that coupled with the Tesla makes a statement to society?
If the owner can show an undeniable benefit, (income/saving/society) then it will be good for resale. Otherwise it just a wart with added costs waiting in the future.