Module Wiring - Canadian Solar CS3U-MB-FG Installation Manual

· To minimize risk in the event of an indirect lightning strike,
avoid forming loops when designing the system.
· The recommended maximum series fuse rating is stated
in a table in the Annex.
· Modules should be safely fixed to bear all expected loads,
including wind and snow loads.
· A minimum clearance of 10 mm (0.394 in) or more
between modules is required to allow for thermal
expansion of the modules. The clearance is from the
plastic corner protector to adjacent plastic corner
protector.
avoId sHadInG
· Even minor partial shading (e.g. from dirt deposits)
reduces yields. A module can be considered to be
unshaded if its entire surface is free from shading all year
round. Sunlight shall be able to reach the module even on
the shortest day of the year.
· Under the premise of assuring maximum power
generating of the front side, obstacles shall be avoid
as much as possible between modules and mounting
ground.
· Permanent shading conditions can affect module service
lifetime, due to accelerated ageing of the encapsulation
material and thermal stress on the bypass diodes.
RelIaBle ventIlatIon
· Bifacial double glass modules need to obtain direct,
reflected, or diffuse sunlight on the backside to generate
additional power. Therefore, bifacial modules are not
suggested to be used in building attached photovoltaic
systems (BAPV). If BAPV, or similar mounting is still
required, sufficient clearance at least 10 cm (3.94 in)
between the module and the mounting surface needs
to be provided to allow cooling air to circulate around
the back of the module. This also allows condensation or
moisture to dissipate.
· According to UL 1703, any other specific clearance
required for maintaining a system fire rating should
prevail. Detailed clearance requirements pertaining to
system fire ratings must be provided by your racking
supplier.
5.1

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· Ensure that the wiring is correct before starting up the
system. If the measured open circuit voltage (Voc) and
short-circuit current (Isc) differ substantially from the
specifications, this indicates that there is a wiring fault.
· When modules have been pre-installed but the system
has not been connected to the grid yet, each module
string should be kept under open-circuit conditions and
proper actions should be taken to avoid dust and moisture
penetration inside the connectors.
· For CS3U and CS3K series modules, Canadian Solar Inc.
offers recommended and optional cable specifications to
match various system configurations, which are shown in
table 3:
· Cables should always be fastened on module frames or
mounting rails, in order to avoid shading on module rear
side.
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