Answer: No, In fact it saves roof shingles from the direct sun light and most of the structure load bearing capacity is over 20 lbs/sqft where as solar panel is 3 lbs/sqft.
Answer: Residential- 30% Federal tax credit of the solar plant cost state will not impose any additional property tax for the appraised value of your house.
Commercial-30% Tax credit plus 21% Depreciation Benefit .