In order to have solar modules, which have a lifespan of at least 25 years, installed on your roof, it should be newer (installed less than 10 years ago) and structurally sound. The ideal roof direction is south or south-west.

Another option, in the event that your roof is not adequate and cannot be replaced, is to install a ground-mount system. They can even be installed with a tracker that will cause the panels to follow the sun throughout the day, absorbing as much energy as possible!