The TerraGrif™ is a metal spring-toothed blade, positioned between the module and the mounting structure, ensuring the optimum equipotential bonding of a photovoltaic installation.
All Terragrifs ™ are studied and realized according to the mounting system and photovoltaic panels.
All TerraGrif™ products are tested by the VERITAS LCIE according to a protocol established in line with currents standards: CEI 61730-2 + A1, IEC 60439-1 – § 18.104.22.168 and NF EN 60068-2-11. Photovoltaic panel frames are anodized and have a resistance in the region of 20 MOhm. They are characterized by a variable frames depending on the manufacturers.
Conventional earthing consists of solutions considered by professionals as being restrictive and ‘not practical’, which have the following characteristics:
The earth cable has to run as close as possible to the conduction cables. (Reminder: like conduction cables, induced loops have to be avoided);
Each of the modules’ frames must have its own earth cable (in 6 mm²) connected to the main earthing cable (>= 10 mm²), while avoiding the creation of a small bridge between the modules’ frames. The reason is simple, if a module has to be removed, the equipotential bonding chain must not be broken.
Connecting the earth to the frame can be done by stainless steel bolting (the module must have holes provided for the earth) or stainless steel self-tapping screws. As copper cannot come into contact with aluminum, tin-plated lugs or bi-metal washers will be used.
Frames are anodized. It is an insulating layer and it therefore has to be scraped to ensure conduction, by using toothed washers/nuts which do the job during tightening (very random attention).
Now “WITH” Terragrif™
The Terragrif™ is designed and produced according to the mounting structure implemented and depending on the various photovoltaic panels used.
The Terragrif™ is in contact with the frame, either by being pressed or interlocked. During the implementation, this interlocking is facilitated by the shape and geometry of the claws, and has several functions.
The advantages of the Terragrif™
Tested and approved by LCIE BUREAU VERITAS (test report available)
The comparison with conventional earthing is no longer necessary. The Terragrif™ saves time and material.
The amount of material used is greatly reduced and generates savings in copper: absence of cable.
The time required to install a Terragrif is extremely flexible and fast (1 second). One clip and that is all.
In comparison with conventional and current earthing processes such as the association of the lugs, cables and screws or also flanges, the Terragrif™ is distinguished by 2 technical advantages, which ensure long-term reliability:
– With Terragrif™, no clamping adjustments are necessary.
– With Terragrif™ positioned under the photovoltaic panel, no pressure load is exerted on the frame and on the edges of the module’s glass, which may undermine the operation of the photovoltaic panel.
Easy to use
Assembly and disassembly for maintenance and/or panel inspection
During the installation of photovoltaic panels, the Terragrif™ is positioned between the module and the mounting system. On some installations and depending on the technical features, some claws are designed for implementation after the modules have been installed.
Reduce the material used for PV earthing
Terragrif™ equips 90% of existing mounting systems
This list changes and is therefore not exhaustive.
All Terragrif™ products are manufactured in France: from the design to the manufacture of the parts (small and large quantities).
No pressure on glass
Ensure optimum level of safety on installations
Reduction of 500 tons of copper
total at end of service life
The Terragrif™ is designed to scratch and destroy the anodized layer of the photovoltaic module’s frame.
The Terragrif™ is attached in the module’s frame and on the mounting system.
Installing the Terragrif™ is facilitated due to its specific geometry and spring action.
The Terragrif™ is held by the anchoring of the claws in the frame material and mounting system. The force of the spring and this geometry prevents the claw from being withdrawn without a suitable tool. The expansion of the aluminium has very little influence given that the spring action of the Terragrif counteracts this effect.