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EN-Rev IM/GN-EN/1.0 Copyright © January, 2023. CSI Solar Co., Ltd.
followed. Different recommendations from specific clamping
hardware suppliers should prevail. 2) The yield strength of
bolt and nut should not be less than 450 MPa.
Clamp material should be anodized aluminum alloy or
stainless steel of appropriate grades.
Clamp positions are of crucial importance for the reliability
of the installation, the clamp centerline must only be
positioned within the authorized position ranges indicated
below, depending on the configuration and load.
The laminate of the PV modules will sink downward to
varying degrees due to gravity, with the center of module
being the maximum deflection position. While using bolting
or clamping mounting method or insertion system, the
maximum allowable deflection (ΔL shown in the picture
below) is 20 mm (in the absence of external forces caused
by, for example, wind and snow). Note that applying
pressure to the module surface during storage,
transportation and installation will lead to more severe
deflection.
6.1 MOUNTING METHOD: BOLTING
The mechanical load test with these mounting methods
were performed according to IEC 61215.
Modules should be bolted to supporting structures through
the mounting holes in the rear frame flanges only.
Each module must be securely fastened at a minimum of 4
points on two opposite sides.
Suitable bolt length should be chosen
based on actual module frame height. For
double glass module with 30 mm frame
height, our recommended maximum bolt length is 20 mm
in order to properly insert the bolts through the mounting
hole. The system designer is responsible to check that the
racking supplier specified bolt length complies with above
requirement and will not affect installation.
In areas with heavy wind loads, additional mounting points
should be used. The system designer and the installer are
responsible for correctly calculating the loads and ensuring
that the supporting structure meets all the applicable
requirements.
Bolt locations on the module, where M6 bolts are used
only in single-axis tracker
Mounting method: Bolting
Modules should be bolted at the following hole locations
depending on the configuration and loads, which is shown
in table 3.
