Module Wiring - Canadian Solar CS3U-P Installation Manual

one module to the negative terminal of the next module.
To connect in parallel, connect the cables from the
positive terminal of one module to the positive terminal
on the next module.
 The quantity of bypass diodes in the module's junction
box provided may vary depending on the model series.
 Only connect the quantity of modules that corresponds
to the voltage specifications of the inverters used in the
system. In addition modules must not be connected
together to create a voltage higher than the maximum
permitted system voltage stated on the module
nameplate, even under the worst local temperature
conditions (see Table 1 for the correction coefficients
that apply to open-circuit voltage).
 A maximum of two strings can be connected in parallel
without using an over-current protection device (fuses,
etc.) incorporated in series within each string. Three or
more strings can be connected in parallel if an
appropriate and certified over-current protection
device is installed in series within each string. And it
shall be ensured in the PV system design that the
reverse current of any particular string is lower than the
module maximum fuse rating at any circumstances.
 Only modules with similar electrical parameters should
be connected in the same string to avoid or minimize
mismatch effects in arrays.
 To minimize risk in the event of an indirect lightning
strike, avoid forming loops with the wiring when
designing the system.
 The recommended maximum series fuse rating is
stated in a table in the Annex A.
 Modules should be safely fixed to bear all expected
loads, including wind and snow loads.
 A minimum clearance of 6.5 mm (0.25 in) between
modules is required to allow for thermal expansion of
the frames.
 The small drainage holes on the underside of the
module must not be blocked.
OPTIMUM ORIENTATION AND TILT
 To maximize the annual yield, please calculate the
EN-Rev IM/GN-AM-EU/2.71 Copyright © June, 2021. CSI Solar Co., Ltd.
optimum orientation and tilt for PV modules in that
specific installation site. The highest yields are achieved
when sunlight shines perpendicularly onto the PV
modules.
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 should be able to reach at least the
module even on the shortest day of the year.
 Constant shading conditions can affect module service
lifetime, due to accelerated ageing of the encapsulation
material and thermal stress on the bypass diodes.
RELIABLE VENTILATION
 Sufficient clearance (at least 102 mm (4.02 in)) between
the module frame and the mounting surface is required
to allow cooling air to circulate around the back of the
module. This also allows condensation or moisture to
dissipate.
 According to UL 61730, 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 MODULE WIRING

CORRECT WIRING SCHEME
 Cable management scheme should be reviewed and
approved by the EPC contractor; in particular required
cable lengths should be cross-checked considering the
specificities of the tracker structure like bearing house
gaps. If longer cable or additional jumper cable is
requested, please contact Canadian Solar's sales
representative in advance.
 Ensure that the wiring is correct before starting up the
system. If the measured open circuit voltage (Voc) and
short-circuit current (Isc) differ 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
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