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6.4
MOUNTING METHODS FOR FRAMED BIFACIAL
MODULE (CLAMPING)
· The mounting method has been qualified by Canadian
Solar Inc. as well as certified by VDE and CSA.
· 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 positi-
oned 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 moun-
ting hardware manufacturer. M8 X 1.25 (5/16”) bolt and
nut are used for this clamping method. The yield strength
of bolt and nut should not be less than 450MPa.
· Tightening torques should be within 17-23 Nm (12.5-
17.0 ft-lbs) for M8 (5/16”-18 Grade B7) coarse thread
bolts, depending on the bolt class. For the bolt grade, the
technical guideline from the fastener suppliers should
be followed. Different recommendations from specific
clamping hardware suppliers should prevail.
· The system designer and 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 shade on module rear side cells
· Canadian Solar Inc.’s warranty may be void in cases where
improper clamps or unsuitable installation methods are
found. When installing inter-modules or end-type clamps,
the clamps must:
1. Not bend the module frame
2. Not touch or cast shadows on the front glass
3. Not damage the surface of the frame (to the exception
of the clamps with bonding pins)
4. Ensure to overlap the module frame by at least 5 mm
(0.2 in)
5. Overlap in length by at least
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. Clamps to have a thickness of 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 relia-
bility 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
10 ± 2 mm (0.39 in) or more, without creating undesirable
shading on the rear side of the cells.
Min. 5 mm
overlap
Min. 3 mm thickness
Min. overlap length
40 mm
Overlap
10 ± 2 mm
Clamp
Rail
Module frame
