A system that is placed on a flat or low sloped roof without roof penetrations is known as a:

A system that is placed on a flat or low-sloped roof without the need for roof penetrations is referred to as a ballasted system. In this type of installation, the solar panels are held in place by the weight of concrete blocks or other heavy materials, which prevents the panels from shifting due to wind or other forces. This design is advantageous as it avoids compromising the integrity of the roof by eliminating the need for drilling or other penetrations that could lead to leaks if not properly sealed.

Ballasted systems are particularly useful on flat roofs where water drainage is a concern, as they can be installed without altering the roof structure. The weight of the ballasting material also allows for a quicker installation process, which can reduce labor costs and time. This method is often preferred when the underlying roof material is sensitive or when the roofing structure cannot support additional load from penetrative mounts. In contrast to other types of installations, a ballasted system provides a non-invasive solution that maintains the roof's integrity while effectively supporting the solar modules.