The ground-mounted option par excellence. This structure consists of excavating the ground to install steel vertical driven or helical piles – screwed deep below the surface – or bored concrete piers which are poured into dug holes with steel
Concrete piers. There is another mounting method that uses concrete but requires significantly more excavation than narrower, pile-driven foundations: concrete piers. These posts are suspended in holes 12 to 18 in.
There are different ways to support a deck, but concrete deck piers provide a strong, solid, stable base upon which to start. Preparing the work area, the size, depth, and layout of the footings, and building code compliance are much the
Ground mounted solar arrays range in size from small residential <10 kW arrays to large utility solutions upwards of 1 MW and beyond. Within that range, there are many, many racking options available to meet the needs of almost any
Concrete Piers: Concrete footings are poured into the ground to support the solar array. This method is commonly used for smaller-scale installations or regions with specific soil conditions. Before installing the solar panels, thorough ground preparation is essential to ensure a level and stable foundation.
Helical Piles: Similar to driven piles, helical piles have a screw-like design, providing anchoring strength for the solar array. They are ideal for sites with weak or sandy soil. Concrete Piers: Concrete footings are poured into the ground to support the solar array.
A concrete pier is a drilled and cast-in-place foundation type for small to medium sized projects. The advantages of concrete piers are that minimal equipment is required for installation, and they can be relatively shallow compared to driven steel piles.
Using concrete piers for Earth Anchors in PV Ground Mounted Arrays has several advantages. Minimal equipment is required for installation, and they can be relatively shallow compared to driven steel piles. However, there are also disadvantages. Concrete is used, which takes days to cure, and the process is labor intensive. Additionally, the steel post must be embedded the full depth of the pier, or rebar cages must be used.
Drilled shaft piles for solar array footings can vary anywhere from 6 to 24 inches in diameter and 5 to 30 feet deep, depending on site conditions and other variables. The drilled shaft or borehole is filled with high-strength cement grout or concrete. At times, steel casing or re-bar is used for reinforcement.
Drilled concrete piers and driven steel piles have been, and remain the most typical foundation supports for ground mounted PV arrays. However, there has been a push for "out-of-the-box" foundation design options including shallow grade beams, ballast blocks, helical anchors, and ground screws.
