Solar Photovoltaic Panel Rectangular Foundation

This case study focuses on the design of a ground mounted PV solar panel foundation using the engineering software program spMats. The selected solar panel is known as Top-of-Pole Mount (TPM), where it is deigned to install quickly and provide a secure mounting structure for PV modules on a single pole.

Solar panel foundation design requirements depend on multiple factors including mounting structure height, EPA values, soil conditions, and local wind load requirements. Key considerations for solar installations include foundation depth (typically 1/6 of pole height plus 2 feet), concrete strength, reinforcement design, and soil bearing capacity.

The primary function of engineered foundations in solar lighting systems is to securely anchor both the pole and solar panel mounting structure while ensuring their stability. The foundation must support not only the pole and light fixture, but also the additional weight and wind loads from solar panels and battery components.

Therefore, using cold-formed thin-walled sections as the support structure for PV modules overcomes the adverse effects of the rigidity of steel structures. This helps mitigate structural deformation, foundation settlement, and expansion deformation, making it an ideal support structure for solar PV modules.

Taller poles with larger fixtures or attached solar panels also increase the wind load, requiring a more robust foundation. Environmental conditions such as soil type, frost heave, and seismic activity also play a role in determining the type of foundation used.

Another common type of concrete foundation used in solar lighting systems is the partially embedded concrete base. This type of foundation is typically buried in the soil, with only a small portion of the concrete base exposed above the ground level.