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ST_PM_ Installation Manual_EN_V1.0 | 08.2020
Copyright © 2020 Mounting Systems GmbH
6.8.3
Work steps for installation of bifacial module rail system
The design and installation of the module carrier rails may vary depending on the
module type, module number, configuration and the structural requirements. The
precise distances and lengths are specified in the project-specific part lists and
layout drawings.
1
Rafter
3
Cross rail connector
2
Purlin (N-S)
4
Module carrier rail (E-W)
Figure 26 substructure for bifacial modules
The substructure for bifacial modules has an additional layer of purlins to ensure a
shadow free and secured mounting of the bifacial modules.
First, install the purlins on the north side of the tracker array by placing the first purlin (2)
on the rafter (1) and securing it with cross rail connectors (3) per rafter and a tightening
torque of 10 Nm.
Then lay the parallel purlins (2) and measure the diagonal distance. Third rail must be
installed in the centre, check the right angle and measure the diagonal again. Use
spacers bars between purlins on recurring points to maintain distances between purlins
and for accurate installation.
Install the module carrier rails (4) perpendicular on and perpendicular to the purlins (3) with
the nut and bolt specified in the project tracker drawings with the given torque. Make
sure that the appropriate N-S distance between the module carrier rails is maintained
according to the module width for ease of module installation. If required use spacer-
bars at multiple points to accurately maintain the distance.
