6.4 Bypass diode
GRUPPOSTG solar module connecting box contains bypass diode which is in
parallel connection with the cell strands. If heat spot occurs locally with the
module, the diode will come into operation to stop the main current from flowing
through the heat spot cells with the view to restrain module heating and
performance loss. But bypass diode is not the overcurrent protection device.
If the diode is found or doubted to get out of order, the installer or system
maintenance supplier shall contact GRUPPOSTG. Please do not try to open the
module connecting box on your own.
Grounding
In design of modules, the anodized corrosion resistant aluminum alloy frame is
used for rigidity support. For safety utilization and to protect modules from
lightning and static-electricity damage, the module frame shall be grounded.
The grounding device shall be in full contact with inner side of the aluminum alloy
and penetrate the frame surface oxide film.
Do not drill additional grounding holes on module frame.
To get the optimal power output, GRUPPOSTG suggests that DC negative pole of
the module array shall be grounded in installation of modules. Otherwise, the
system power output will be reduced.
Module installation methods can not lead to electrochemical corrosion between
module aluminum frame and different metals. Electrochemical potential
difference of contacting metals shall not exceed 0.6V as is recommended in UL1703
Appendix Flat Plate Photovoltaic Modules and Panels.
Holes on the frame shall be drilled in advance and grounding signs shall be
indicated. These holes are only used for grounding but not for installation of
modules.
A module with exposed conductive parts is considered to be in compliance with
UL1703 only when it is electrically grounded in accordance with the instructions
presented below and the requirements of the National Electrical Code.
Where common grounding hardware (nuts, bolts, star washers, spilt-ring lock
washers, flat washers and the like) is used to attach a listed grounding/bonding
device, the attachment must be made in conformance with the grounding device
manufacturer’s instructions.
GRUPPOSTG recommends must thoroughly detail the attachment means in the
module installation instructions.
Installation Manual PV Modules High Power Half Cut
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