What are the disadvantages of high-rise solar installation?

For high-rise residential buildings, the roof area is limited, which can not meet the requirements of all users to install solar energy; Many new buildings can't install solar energy because of the limitation of roof structure or the requirement of maintaining the appearance of the city. Traditional solar energy is resisted by users on the top floor, which limits the installation of other users; Traditional solar water heaters, due to structural restrictions, can not be well combined with buildings, affecting the beauty of buildings, so many property rights units restrict their installation. .