It is better to install solar panels on the ground only when you have proper site conditions — including adequate ground space and approval from your neighborhood — as ground installation makes solar panels more productive.  When on the ground, solar panels can be installed with the ideal tilt and orientation for maximum sunlight, and you can add a solar tracker to make them even more productive. In a rooftop system, the panels are permanently fixed with the same orientation, which is not always the best direction for solar panels.