11
the effect of thermal expansion and contraction,
and the spacing between the two adjacent
photovoltaic module frames should not be less
than 10mm during installation.
For specific installation methods, please refer to
the following installation specifications.
5.3.1
Bolting through the mounting holes
All modules must be securely fastened with at
least 4 bolts (As shown in Figure 2, Figure 3, Figure 4 ,
Figure 5 and Figure 6).
Fig 2 Bolt installation for 54cell
Fig 3 Bolt installation for 60cell
Fig 4 Outer four-hole bolt installation for 72cell
Fig 5 Internal four-hole bolt installation for 72cell
Fig 6 400mm pitch bolt installation for 72cell
！
note
：
In order to achieve maximum safety
precautions against wind and snow loads, it is
recommended that all available mounting holes should
be used.Bolts are inserted as described in the process
below (Sketch figure 7).
Figure 7 Schematic diagram of bolt installation process
①
Place the module on the supporting bars
underneath.
②
Insert the four stainless-steel bolts (M6) through
the holes (7x11.5mm) or stainless-steel bolts (M8)
through the holes (9x14mm) in the frame
according to the Figure 2, Figure 3 & Figure 4.
The 400mm pitch mounting hole size is 7x10mm,
