Double-glass modules are gaining attention in the industry for their sleek appearance and improved performance. For solar contractors familiar with framed modules, however, glass-on-glass construction can complicate installation efforts. Below, Cenergy Solar offers four tips for installing this type of module.

1: Correctly set the bolt torque to ensure the double-glass module is firmly secured.

Laboratory test results show that a nominal bolt torque of 23±3N.m is recommended for the Diamond module. Other modules will have different values—check the installation manual. To tighten bolts with uniform torque values, use a qualified torque wrench.

In addition, it is critical to verify bolt torque requirements from fastener suppliers’ documentation before installing double-glass modules. And be sure to check your module’s installation manual for which mounting products are endorsed by the supplier.

2: Use proper safety tools, including durable rubber suction cups and strong gloves, for safe handling of double-glass modules.

Double-glass modules must be handled carefully by installers to avoid damage. If the modules are installed incorrectly, the probability of damage dramatically increases. Canadian Solar recommends using two pairs of rubber vacuum cups to handle the panel. Modules must always be unpacked and transported by two people. When using suction cups, the surfaces of the modules must be kept clean in order to ensure proper adhesion.

3: Allow for additional buffer space between the rear glass and mounting rails.

When the double-glass module is exposed to different climatic loads, the panel may deflect, which means the rear glass may come in direct contact with any adjacent aluminum or steel rails. Therefore, in the case of dynamic loads (such as wind gusts during a storm), the modules will face an increased risk of damage. Cenergy Solar recommends that a reasonable level of buffer material, such as EPDM rubber, be mounted between standard rails and the back side of the double-glass modules. Typically, rubber materials can be pre-assembled in a solar module workshop or on-site during module installation.

4: Ensure there is adequate allowance on double-glass modules so the frame is not susceptible to any damage.

During installation, it is critical that suitable allowance is maintained to preserve rigid contact between the clamp and the edge of the double-glass module. The suitable allowance needed is fairly narrow, approximately 1 mm. If a suitable allowance is not maintained and the side edges of the double-glass module come in contact with the side edge of the aluminum clamp, this will result in contract stress, causing the material to expand and potentially crack. Also be sure to follow additional tips below:

• Place one special blocking on the standard rail to ensure that an appropriate gap is maintained between the clamps and the edge of the double-glass module.
• For Diamond double-glass modules, Cenergy Solar recommends at least a 1-mm gap between the clamps and edge of the module to ensure adequate room and space for expansion.
• In addition, place one special buffer on the standard rail to maintain a reasonable gap between the clamps and edge of the double-glass module.
• The compatibility of the special blocking design must be maintained with the majority of double-glass modules and clamps. The same or similar aluminum alloy materials are required to ensure that the module is set properly.
• Finally, remove the special blocking from the standard rail after fixing the double-glass module with clamps.

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