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EN-Rev IM/GN-BM-EN/2.1 Copyright © April, 2022. CSI Solar Co., Ltd.
www.csisolar.com
M8 x 1.25-Grade 8.8 (5/16”-18 Grade B7) galvanized or
A2-70 stainless steel coarse thread bolts, depending on
bolt class. 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.
6.1 MOUNTING METHODS: 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.
M8 X 1.25 - Grade 8.8 (5/16”-18 Grade B7) galvanized or
A2-70 stainless steel 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 450MPa.
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
comply with above requirement and will not affect
installation.
Tightening torques should be within 16~20 Nm
(11.8~14.75 ft-lbs) for M8 (5/16”) coarse thread bolts,
depending on bolt class.
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.
Mounting method: Bolting
Modules should be bolted at the following hole
locations depending on the configuration and loads:
