The solar mounting structure is the backbone that every module frame bonds to, so it carries the array fault and lightning-induced current to earth. Each structure row is bonded to a buried earth conductor and driven electrodes, forming the array earth that ties into the plant grid.
How it is earthed
- Module frames bond to the structure; the structure bonds to a buried strip along the row.
- Earth rods are driven at intervals along the array and tied to the strip.
- The array earth connects to the inverter and plant earth grid.
- In high-resistivity soil, earth-enhancing compound lowers the pit resistance.
Resistance target
Aim for a low array earth resistance (commonly a few ohms, 1 ohm or less at inverter and transformer stations). Galvanised structures still need dedicated bonding - paint, anodising and bolted joints are not a reliable earth path.
