Where should a solar collector be mounted when positioned on the ground?

Mounting a solar collector on a concrete pad is a practical and effective choice for several reasons. A concrete pad provides a stable, durable foundation that can support the weight of the solar panel and withstand environmental conditions, such as wind and snow. Properly securing the solar collector on a concrete pad also helps to prevent movement or tilting, ensuring optimal performance and alignment for sunlight exposure.

In addition, a concrete pad can help with drainage, keeping the area around the solar collector free from standing water, which can mitigate the risk of damage to the system. It also allows for easier access for maintenance while providing a level surface, making installation more straightforward.

Each of the other options has merits in different contexts but doesn't address the stability and long-term reliability of a ground-mounted solar collector as thoroughly as a concrete pad does.