Can I use concrete blocks for solar panel racking?

Choosing the Right Concrete Blocks

When selecting concrete blocks for solar panel racking, look for blocks with a minimum weight of 35-40 pounds each and a flat top surface. Blocks with a smooth finish and a hole pattern that aligns with the solar panel’s bolt pattern will make installation easier. A good rule of thumb is to use at least 6-8 blocks per row, spaced 12 inches apart, to ensure stability and prevent collapse.

Designing the Racking System

To ensure a secure and level racking system, calculate the total weight of the solar panels and the blocks, and design the system with a minimum 1:12 pitch (1 inch of rise per 12 inches of run). Use a string of blocks as the main support beam, with additional blocks placed at regular intervals to provide intermediate support. Make sure to include a 1-2 inch gap between the blocks and the solar panels to allow for thermal expansion.

Installation Tips

When installing the concrete block racking system, start with a solid foundation of sand or gravel, and compact it well to prevent settling. Place the blocks on a level surface, ensuring they are securely fastened to the foundation using rebar or anchor bolts. Use a spirit level to verify the system’s levelness and plumbness before adding the solar panels. Finally, secure the solar panels to the blocks using standard racking hardware, following the manufacturer’s instructions.