Mounting Methods: Clamping - CanadianSolar CS3W-PB-AG Installation Manual

6.2 MOUNTING METHODS: CLAMPING

 The mechanical load test with these mounting methods
were performed according to IEC 61215.
 Each module must be securely fastened at a minimum
of four points on two opposite sides. The clamps should
be positioned symmetrically. The clamps should be
positioned according to the authorized position ranges
defined in table below. Install and tighten the module
clamps to the mounting rails using the torque stated by
the mounting hardware manufacturer. M8 X 1.25 -
Grade 8.8 (5/16"-18 Grade B7) galvanized or A2-70
stainless steel bolt and nut should be used. The yield
strength of bolt and nut should not be less than 450
MPa.
 Tightening torques should be within 16~20 Nm
(11.8~14.75 ft-lbs) for M8 (5/16"-18 Grade B7) coarse
thread bolts, depending on the bolt class. For the bolt
grade, the technical guidelines from the fastener
suppliers should
recommendations from specific clamping hardware
suppliers should prevail.
 The system designer and the installer are responsible
for load calculations and for proper design of support
structure.
 The mounting rails shall be designed to limit as much
as possible the shade on module rear side cells.
 Canadian Solar's warranty may be void in the cases
where improper clamps (For example, the clamp height
does not match with the frame height) or unsuitable
installation methods are found. When installing inter-
modules or end-type clamps, please take the following
measures into account:
1. Do not bend the module frame.
2. Do not touch or cast shadows on the front glass.
3. Do not damage the surface of the frame (to the
exception of the clamps with bonding pins).
4. Ensure the clamps overlap the module frame by at
least 10 mm (0.4 in) for CS6W, CS7N and CS7L, and
5mm (0.2in) for other module series.
5. Overlap in length by at least
EN-Rev IM/GN-BM-EN/2.5C1Copyright © January, 2023. CSI Solar Co., Ltd.
be followed. Different
a) 80 mm (3.15 in) when 2400 Pa < uplift load ≤ 4000
Pa is required.
b) 40 mm (1.57 in) when uplift load ≤ 2400 Pa is
required.
6. Ensure the clamp thickness is at least 3 mm (0.12 in).
 Clamp material should be anodized aluminum alloy or
stainless steel.
 Clamp positions are of crucial importance for the
reliability of the installation. The clamp centerlines must
only be positioned within the ranges indicated in table
below, depending on the configuration and load.
 For configurations where the mounting rails run
parallel to the frame, precautions should be taken to
ensure the bottom flange of the module frame overlaps
the rail by at least 15 mm (0.59 in) for CS6W, CS7N and
CS7L modules, and 10 mm (0.4 in) for other module
series.
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