PHOTOWATT PW60HT-C-XF, Installation Manual

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D84-P06-01 GB R2 28/07/2020 www.photowatt.com
14
6.2
MOUNTING METHODS FOR FRAMED BIFACIAL
MODULE (CLAMPING)
•
The mounting method has been qualified by
EDF ENR PWT 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 symmetri-
cally. The clamps should be positioned accor-
ding 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 mounting hardware manufactu-
rer. 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 guide-
line from the fastener suppliers should be fol-
lowed. Different recommendations from speci-
fic clamping hardware suppliers should prevail.
•
The system designer and installer are res-
ponsible 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
•
EDF ENR PWT’s warranty may be void in cases
where improper clamps or unsuitable instal-
lation methods are found. When installing in-
ter-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 ex-
ception 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 reliability 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.