Canadian Solar CS3U-MB-FG Installation Manual page 16

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M8 X 1.25 (5/16") bolt and nut should be used.
Plain washer size should be M8 with outer diameter
16 mm.
The yield strength of bolt and nut should not be less than
450 MPa.
Suitable bolt length should be chosen
based on actual module frame height.
For bifacial module with 30 mm frame height, our re-
commended 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 comply with above require-
ment and will not affect installation.
· Tightening torques should be within 17-23 Nm (12.5-17.0
ft-lbs) for M8 (5/16") coarse thread bolts, depending on
bolt class.
CS3U-MB-AG, CS3U-PB-AG, CS3W-PB-AG
Bolting on long frame side using four middle mounting
holes. Mounting rails run parallel to the long frame side.
Maximum Load:
Uplift load ≤ 2400 Pa
Downforce load ≤ 3600 Pa
CS3K-MB-AG, CS3K-PB-AG
Bolting on long frame side using four innermost moun-
ting holes. Mounting rails run parallel to the long frame
side.
Maximum Load:
Uplift load ≤ 2400 Pa
Downforce load ≤ 3600 Pa
EN-Rev IM/GN-BM-EU/1.21 Copyright © July 2019. Canadian Solar Inc.
· In areas with heavy wind loads, additional mounting
points should be used. The system designer and the in-
staller are responsible for calculating the load and ensu-
ring that the support structure meets the requirements.
Bolt Washer
Spring
Washer Nut Washer
· Modules should be bolted at the following hole locations
depending on the configuration and load:
Bolting on long frame side using four middle mounting
holes. Mounting rails run perpendicularly to the long
frame side.
Maximum Load:
Uplift load ≤ 2400 Pa
Downforce load ≤ 5400 Pa
Bolting on long frame side using four innermost moun-
ting holes. Mounting rails run perpendicularly to the long
frame side.
Maximum Load:
Uplift load ≤ 2400 Pa
Downforce load ≤ 5400 Pa
Frame
Rail