CanadianSolar CS3W-PB-AG Series User manual

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INSTALLATION
MANUAL OF BIFACIAL
MODULE
For professional use only

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EN-Rev IM/GN-BM-EN/1.71 Copyright © December 2020. CSI Solar Co., Ltd.
1.0 GENERAL INFORMATION |3
1.1 INSTALLATION MANUAL DISCLAIMER |3
1.2 LIMITATION OF LIABILITY |3
2.0 SAFETY PRECAUTIONS |3
3.0 MECHANICAL / ELECTRICAL SPECIFICATIONS |4
4.0 UNPACKING AND STORAGE |5
5.0 MODULE INSTALLATION |6
5.1 MODULE WIRING |7
5.2 GROUNDING |10
6.0 MOUNTING INSTRUCTIONS |11
6.1 MOUNTING METHODS FOR FRAMED BIFACIAL
MODULE (BOLTING) |12
6.2 MOUNTING METHODS FOR FRAMED BIFACIAL
MODULE (CLAMPING) |14
6.3 MOUNTING METHODS FOR FRAMED BIFACIAL
MODULE (SINGLE-AXIS TRACKER) |18
7.0 MAINTENANCE |22
AMENDED EDITIONS AND DATES |22
ANNEX A: MECHANICAL AND ELECTRICAL RATINGS |23
ANNEX B: ALTERNATIVE GROUNDING METHODS
ANNEX C: MODULE CLEANING GUIDELINES |25
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1.0
GENERAL INFORMATION
This general manual provides important safety informati-
on relating to the installation, maintenance and handling
of bifacial double glass solar modules (BiKu and BiHiKu
series). Professional installer must read these guidelines
carefully and strictly follow these instructions. Failure to
follow these instructions may result in death, injury or
property damage. The installation and handling of PV
modules requires professional skills and should only be
performed by qualified professionals. Installers must
inform end -users (consumers) about the aforesaid infor-
mation accordingly.
The word “module” or “PV module” used in this manual
refers to one or more double glass solar modules. This
manual is only valid for the bifacial double glass module
types CS3W-PB-AG, CS3W-MB-AG, CS3U-MB-AG, CS3K-
MB-AG, CS3U-PB-AG, CS3K-PB-AG, CS3Y-MB-AG and
CS3Y-PB-AG. Please retain this manual for future referen-
ce.
We recommend visiting www.csisolar.com regularly for
the most updated version of bifacial module installation
manual.
1.1
INSTALLATION MANUAL DISCLAIMER
The information contained in this manual is subject to
change by CSI Solar Co., Ltd. without prior notice. CSI
Solar Co., Ltd. gives no warranty of any kind whatsoever,
either explicitly or implicitly, with respect to the informa-
tion contained herein.
In the event of any inconsistency among different lan-
guage versions of this document, the English version
shall prevail. Please refer to our product lists and docu-
ments published on our website at: http://www.csisolar.
com as these lists are updated on a regular basis.
1.2 LIMITATION OF LIABILITY
CSI Solar Co., Ltd. shall not be held responsible for da-
mages of any kind, including– without limitation – bodily
harm, injury or damage to property, in connection with
handling PV modules, system installation, or compliance
or non-compliance with the instructions set forth in this
manual.
2.0
SAFETY PRECAUTIONS
Warning: Before attempting to install, wire,
operate and/or service the module and other
electrical equipment, all instructions
should be read and understood. PV module connectors
pass direct current (DC) when exposed to sunlight or
other light sources. Contact with electrically active parts
of the module, such as terminals, can result in injury or
death, irrespective of whether or not the module and the
other electrical equipment have been connected.
Avertissement: Toutes les instructions devront
être lues et comprises avant de procéder à
l’installation, le câblage, l’exploitation et/ou
l’entretien des panneaux. Les interconnexions des
panneaux conduisent du courant continu (CC) lorsque le
panneau est exposé à la lumière du soleil ou à d’autres
sources lumineuses. Tout contact avec des éléments
sous tension du panneau tels que ses bornes de sortie
peut entraîner des blessures ou la mort, que le panneau
soit connecté ou non.
GENERAL SAFETY
· All Modules must be installed by licensed electricians
in accordance with the applicable electrical codes
such as, the latest National Electrical Code (USA) or
Canadian Electric Code (Canada) or other national or
international electrical codes.
Protective clothing (non-slip gloves, clothes,
etc.) must be worn during installation to pre-
vent direct contact with 30 VDC or greater, and
to protect hands from sharp edges.
Prior to installation, remove all metallic jewelry
to prevent accidental exposure to live circuits.
When installing modules in light rain, morning
dew, take appropriate measures to prevent
water ingress into the connectors, f. e. using
connector endcaps.
Do not allow children or unauthorized persons
near the installation site or module storage
area.
· Use electrically insulated tools to reduce the risk of
electric shock.
· If the disconnects and over current protective devices
(OCPD) cannot be opened or the inverter cannot be po-
wered down, cover the fronts and backs of modules in

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EN-Rev IM/GN-BM-EN/1.71 Copyright © December 2020. CSI Solar Co., Ltd.
the PV array with an opaque material to stop the produc-
tion of electricity when installing or working on a module
or wiring.
· Do not install modules in strong wind.
· Do not use or install broken modules.
· Do not contact module surface if the front or rear glass is
broken. This may cause electric shock.
· Do not open the cover of the junction box at any time.
· Do not attempt to repair any part of the PV module. The
module does not contain any serviceable parts.
· Do not disassemble a module or remove any module part.
· Do not artificially concentrate sunlight on a module.
· Do not connect or disconnect modules when current from
the modules or an external source is present.
3.0
MECHANICAL / ELECTRICAL SPECIFICATIONS
Module electrical ratings are measured under Standard Test
Conditions (STC) of 1000 W/m2 irradiance, with an AM 1.5
spectrum, and a cell temperature of 25°C. Detailed electrical
and mechanical characteristics of CSI Solar Co., Ltd. crystal-
line silicon PV modules can be found in Annex A (Mechani-
cal And Electrical Ratings) of this Installation Manual. Main
electrical characteristics under STC are also stated on each
module label. Please refer to the datasheet or the product
nameplate for the maximum system voltage.
Under certain conditions, a module may produce more cur-
rent or voltage than its Standard Test Conditions rated pow-
er. For Bifacial modules particularly, the operating current is
related to specific system mounting and design conditions,
and will vary under different module mounting height and
albedo of ground surface. As a result, correction factors
should be applied to the module short-circuit current and
the open-circuit voltage under STC, when determining com-
ponent ratings and capacities.
For open-circuit voltage, the most conservative correction
factors presented in Table 1 below generally applies.
TABLE 1: LOW TEMPERATURE CORRECTION FACTORS FOR
OPEN-CIRCUIT VOLTAGE
Lowest Expected Ambient
Temperature (°C/°F) Correction Factor
24 to 20 / 76 to 68 1.02
19 to 15 / 67 to 59 1.04
14 to 10 / 58 to 50 1.06
9 to 5 / 49 to 41 1.08
4 to 0 / 40 to 32
-1 to -5 / 31 to 23
1.10
1.12
-6 to -10 / 22 to 14 1.14
-11 to -15 / 13 to 5 1.16
-16 to -20 / 4 to -4 1.18
-21 to -25 / -5 to -13 1.20
-26 to -30 / -14 to -22 1.21
-31 to -35 / -23 to -31 1.23
-36 to -40 / -32 to -40 1.25
Alternatively, a more accurate correction factor for the
open-circuit voltage can be calculated using the following
formula:
T (°C) is the lowest expected ambient temperature at the
system installation site
αVoc (%/ºC) is the voltage temperature coefficient of the se-
lected module (refer to corresponding datasheet)
OCPD rating selection should be done per the following
guidance, where the minimum OCPD rating possible is
determined by calculating the expected maximum circuit
current for the PV system, and the maximum OCPD rating
constrained by the IEC 61215: 2016 and UL 1703: 2018 stan-
dard requirements for the certified PV modules.
Minimum string fuse rating < X ≤ Maximum string fuse
rating
The maximum string fuse ratings can be found in ANNEX
A: Mechanical And Electrical Ratings for all the certified CSI
Solar bifacial module types.
The minimum string fuse rating for compliance with
NEC: 2017 code and IEC62548: 2016 requirement is sugge-
sted to be determined as follows:
Minimum string fuse rating = IscSTC x 1.25 x Max (1.175,
Imppα ÷ ImppSTC)
Imppα = the highest 3-hour current average resulting
from the simulated local simultaneous irradiances on the
front and rear sides of the PV array accounting for eleva-
tion and orientation
IscSTC = the listed short circuit current at 0% bifacial gain
CVOC = 1-αVoc ˣ (25 - T)

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on the PV module datasheet or nameplate label
ImppSTC = the listed MPP operating current at 0% bi-
facial gain on the PV module datasheet or nameplate
label
An assembly, together with its overcurrent device (s),
that is listed for continuous operation at 100 percent of
its rating shall be permitted to be used at 100 percent of
its rating, and therefore shall not require the additional
1.25 multiplier
Appropriate correction factors should be selected by
licensed professional electrical engineers according to
relevant design codes and system simulation results. CSI
Solar does not take responsibility for the determination
of the minimum series fuse rating.
Please contact CSI Solar’s technical support team for
additional information pertaining to engineering opti-
mization and approval of project specific module string
lengths.
4.0
UNPACKING AND STORAGE
PRECAUTIONS
· Modules should be stored in a dry and ventilated en-
vironment to avoid direct sunlight and moisture. If
modules are stored in an uncontrolled environment,
the storage time should be less than 3 months and ex-
tra precautions should be taken to prevent connectors
from being exposed to moisture or sunlight, like using
connector endcaps. Connector endcaps are available
upon request.
· Unpack module pallets carefully, following the steps
shown on the pallet. Unpack, transport and store the
modules with care.
· Modules must always be unpacked and installed by at
least two people. Always use both hands when hand-
ling modules with gloves.
· Do not lift modules by their wires or junction box.
· Do not stack the framed modules.
· Do not place excessive loads on the module or twist
the module.
· Do not stand, step, walk and/or jump on modules
under any circumstances. Localized heavy loads may
cause severe micro-cracks at cell level, which in turn
may compromise module reliability and void CSI Solar
Co., Ltd.’ s warranty.
· Do not carry modules on your head.
· Do not drop or place objects (such as tools) on the mo-
dules.
· Do not use sharp instruments on the modules.
· Do not leave modules unsupported or unsecured.
· Do not change the wiring of bsypass diodes.
· Keep all connectors clean and dry at all times.
· Do not expose the modules and its connectors to any
unauthorized chemical substance (e.g. oil, lubricant,
pesticide, etc.).
PRODUCT IDENTIFICATION
· Each module has two identical barcodes (one in the
laminate under the front glass, the second on the rear
side of the module) that act as a unique identifier. Each
module has a unique serial number containing 14 di-
gits.
· A nameplate is also affixed to the rear glass of each
module. This nameplate specifies the model type, as
well as the main electrical and safety characteristics of
the module.

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EN-Rev IM/GN-BM-EN/1.71 Copyright © December 2020. CSI Solar Co., Ltd.
5.0 MODULE INSTALLATION
PRECAUTIONARY MEASURES AND
GENERAL SAFETY
· Prior to installing modules please obtain information
about any requirements and necessary approvals for
the site, installation and inspection from the relevant
authorities.
· Check applicable building codes to ensure that the con-
struction or structure (roof, facade, support, etc.) can
bear the module system load.
· CSI Solar Co., Ltd. bifacial double glass solar modules
(BiKu and BiHiKu) have been qualified for Application
Class A (equivalent to Safety Class II requirements). Mo-
dules rated under this class should be used in systems
operating at voltage above 50V or power above 240W,
where general contact access is anticipated.
· CSI Solar Co., Ltd. bifacial double glass modules have
been certified as Type 3 or Type 13 according to UL
1703, Type 29 according to UL 61730 and as Class A or
Class C for fire performance according to IEC 61730-2,
please refer to the datasheet or the product nameplate
for the detailed types.
· Consult your local authority for guidelines and require-
ments for building or structural fire safety.
UL 1703 SYSTEM FIRE RATING REQUIREMENTS
· The fire rating of this module is only valid when the
product is installed as specified in the mechanical
mounting instructions.
· When installing the modules, ensure the assembly is
mounted over a fire resistant roof covering rated for
the application.
· A photovoltaic system composed of UL1703 or UL
61730 certified modules mounted on a UL2703 certified
mounting system should be evaluated in combination
with roof coverings in accordance with UL1703 or UL
61730 standard, with respect to meeting the same fire
classification as the roof assembly.
· Mounting systems with a System Fire Class Rating (Class
A, B or C), tested in conjunction with fire rated “Type 3”
or “Type 13” rated modules, are considered acceptable
for use with CSI Solar Co., Ltd. modules, provided the
mounting system does not violate any other require-
ment of this manual.
· Any mounting system limitation on inclination or accesso-
ry required to maintain a specific System Fire Class Rating
should be clearly specified in the installation instructions
and UL2703 certification of the mounting system supplier.
ENVIRONMENTAL CONDITIONS
· The module is intended for use in general open-air clima-
tes, as defined in IEC 60721-2-1: Classification of environ-
mental conditions Part 2-1: Environmental conditions ap-
pearing in nature - temperature and humidity.
· Please consult the CSI Solar Co., Ltd. technical support
department for more information on the use of modules
in special climates, such as an altitude greater than
2000 m, heavy snow, severe hail storm, hurricane etc.
· Do not install modules near open flames or flammable
materials.
· Do not immerse modules in water or constantly expose
modules to water (either fresh or salt) (i.e. from fountains,
sea spray).
· Exposing modules to salt (i.e. marine environments) or
sulfur (i.e. sulfur sources, volcanoes) incurs the risk of
module corrosion.
· Do not expose modules and their connectors to any unau-
thorized chemical substances (e.g. oil, lubricant, pesticide,
etc.), as modules may incur damages.
· Failure to comply with these instructions will void CSI Solar
Co., Ltd. warranty.
INSTALLATION REQUIREMENTS
· Ensure that the module meets the general technical
system requirements.
· Ensure that other systems components do not damage
modules mechanically or electrically.
· Modules can be wired in series to increase voltage or in
parallel to increase current. To connect modules in series,
connect the positive terminal of one module to the nega-
tive terminal of the next module. To connect in parallel,
connect the positive terminal of one module to the positi-
ve terminal of the next module.
· 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

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permitted system voltage stated on the module name-
plate, 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 appropria-
te and certified over-current protection device is installed
in series with each string. And it shall be ensured in the
PV system design that the reverse current of any particu-
lar string is lower than the module maximum fuse rating
under any circumstances.
· Only modules with similar electrical parameters should
be connected in the same string to avoid or minimize mis-
match 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 table 1 in the Annex A.
· Modules should be safely fixed to bear all expected loads,
including wind and snow loads.
· After the installation of double glass modules, a 30 mm
deflection for framed module is allowed.
· For framed modules, a minimum clearance of 6.5 mm (0.25
in) between modules is required to allow thermal expan-
sion of the frames and modules.
OPTIMUM ORIENTATION AND TILT
· To maximize the annual yield, please calculate the opti-
mum orientation and tilt for PV modules in that specific
installation site. The highest yields are achieved when sun-
light shines perpendicularly onto the PV modules.
AVOID SHADING
· Even minor partial shading (e.g. from dirt deposits) re-
duces the yield. A module can be considered to be unsha-
ded if its entire surface is free from shading all year round.
Sunlight should be able to reach at least the front side of
the module even on the shortest day of the year.
· For optimizing the power generation of the rear side of
bifacial modules, obstacles between modules and the
mounting ground should be avoided as much as possible.
· 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
· Bifacial modules use 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 of at least
10 cm (3.94 in) between the module and the mounting
surface needs to be provided to allow cooling air to circu-
late around the back of the module. This also allows con-
densation or moisture to dissipate.
· According to UL 1703, if any other specific clearance re-
quired 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
· 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 spe-
cifications, this indicates that there is a wiring fault.
· Do not connect different connectors (brand and model)
together.
· 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 penet-
ration inside the connectors.
· For CS3W, CS3U, CS3Y and CS3K series modules, CSI Solar
Co., Ltd. offers several cable length options to match vari-
ous system configurations, which are shown in table 2:
· On below figures, bold lines represent cable installation
pathways, while + and - connector correspond to positive
and negative module terminals respectively.
· Cables should always be fastened on module frames or
mounting rails, in order to avoid shading on module rear
side.
· In case where a cable connection method not included in

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TABLE 2:
SYSTEM CABLE CONFIGURATION FOR CS3W, CS3U, CS3Y AND CS3K MODULES
Module types Recommended wiring congurations
CS3U-MB-AG
CS3K-MB-AG
CS3U-PB-AG
CS3K-PB-AG
CS3W-PB-AG
CS3W-MB-AG
CS3Y-PB-AG
CS3Y-MB-AG
Landscape installation two rows: CS3U/CS3W/CS3Y Cable length per lead= 1400 mm
CS3K Cable length per lead=1250 mm
Adjacent modules in the same row need to be rotated 180 degrees for proper
installation.
Portrait installation one row: CS3U/CS3K/CS3W Cable length per lead = 400 mm (+), 280 mm (-)
CS3Y Cable length per lead = 410 mm (+), 290 mm (-)
below table is used, please confirm suitable cable length
with CSI Solar’s sales representative.

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Module types Recommended wiring congurations (continued)
CS3U-MB-AG
CS3K-MB-AG
CS3U-PB-AG
CS3K-PB-AG
CS3W-PB-AG
CS3W-MB-AG
CS3Y-MB-AG
CS3Y-PB-AG
Portrait installation two rows:
CS3U cable length = 400 mm (+), 280 mm (-) & 1800 mm jumper cable
CS3W cable length = 400 mm (+), 280 mm (-) & 2000 mm jumper cable
CS3K cable length = 400 mm (+), 280 mm(-) &1400 mm jumper cable
CS3Y Cable length = 410 mm (+), 290 mm (-) & 2000 mm jumper cable
Modules in adjacent rows should be rotated 180 degrees for proper
installation.
Portrait installation one row: (Leap-frog for single-axis tracker)
CS3U Cable length = 1670 mm (+), 1670 mm (-)
CS3W/CS3Y Cable length = 1850 mm (+), 1850 mm (-)
The maximum distance between two adjacent modules should be within 50 mm (1.96 in) for side with mounting clamps,
and within 25 mm (0.98 in) for side without mounting clamps, in order to meet system cable scheme.
Jumper
Cable

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easily accumulate.
5.2
GROUNDING
· For grounding requirements in North America, a module
with exposed conductive parts is considered to comply
with UL 1703 only when it is electrically grounded in accor-
dance with both the instructions presented below and the
requirements of the National Electrical Code. Any ground-
ing means used with CSI Solar Co., Ltd. modules should
be NRTL certified to UL 467 and UL 2703 standards. Please
consult our technical service team for the formal approval
process.
· For grounding requirements in other areas, although the
modules are certified to Safety Class II, we recommend
them to be grounded and that module installation should
comply with all applicable local electrical codes and re-
gulations. Grounding connections should be installed by
a qualified electrician. Connect module frames together
using adequate grounding cables: we recommend using
4-14 mm² (AWG 6-12) copper wire. Holes provided for
this purpose are identified with a grounding symbol
(IEC61730-1). All conductive connection junctions must be
firmly fixed.
· Do not drill any extra ground holes for convenience as this
will void the modules warranty.
· All bolts, nuts, flat washers, lock washers and other
relevant hardware should be made of stainless steel,
unless otherwise specified.
· CSI Solar Co., Ltd. does not provide grounding hardware.
· One grounding method is recommended for CSI Solar Co.,
Ltd. standard modules, as described below. For alternative
grounding methods, please refer to Annex B (Alternative
Grounding Methods).
CORRECT CONNECTION OF PLUG CONNECTORS
· Make sure that all connections are safe and properly
mated. The PV connectors should not be subjected to
stress from the exterior. Connectors should only be used
to connect the circuit. They should never be used to turn
the circuit on and off.
· Connectors are not waterproof when unmated. When
installing modules, connectors should be connected to
each other as soon as possible or appropriate measures
(like using connector endcaps) should be taken to avoid
moisture and dust penetrating into the connector.
· Do not clean or precondition the connectors using lubri-
cants or any unauthorized chemical substances.
USE OF SUITABLE MATERIALS
· Only use dedicated solar cable and suitable plugs (wiring
should be sheathed in a sunlight-resistant conduit or, if
exposed, should itself be sunlight-resistant) that meet
local fire, building and electrical regulations. Please ensure
that all wiring is in perfect electrical and mechanical
condition.
· Installers may only use single-conductor cable listed and
labeled as USE-2 or PV wire which is 90°C wet rated in
North America, and single conductor cable, 4-16 mm² (5-12
AWG), 90°C wet rated in other areas (i.e. TUV 2PfG1169 or
EN50618 approved), with proper insulation which is able
to withstand the maximum possible system open-circuit
voltage. Only copper conductor material should be used.
Select a suitable conductor gauge to minimize voltage
drop and ensure that the conductor ampacity complies
with local regulations (i.e. NEC 690.8(D)).
CABLE AND CONNECTOR PROTECTION
· Secure the cables to the mounting system using UV-
resistant cable ties. Protect exposed cables from damage
by taking appropriate precautions (e.g. placing them
inside a metallic raceway like EMT conduit). Avoid
exposure to direct sunlight.
· A minimum bending radius of 60mm (2.36 in) is required
when securing the junction box cables to the racking
system.
· Protect exposed connectors from weathering damage by
taking appropriate precautions. Avoid exposure to direct
sunlight.
· Do not place connectors in locations where water could

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· A grounding kit containing an M5 (3/16“) SS cap bolt, an
M5 (3/16“) SS flat washer, an M5 (3/16“) SS cup washer,
and an M5 (3/16“) SS nut (with teeth) should be used to
attach copper grounding wire to a pre-drilled grounding
hole on the frame (see image above). The grounding holes
are located at the upper and lower edges of the long side
frame, close to the module short sides.
· Mounting rail designs should be such to allow easy access
to the grounding holes located on the long side of the fra-
me, in order to enable the equipment grounding function
when required.
· Place the wire between the flat washer and the cup was-
her. Ensure that the cup washer is positioned between the
frame and the wire with the concave side up to prevent
galvanic corrosion. Tighten the bolt securely using the SS
toothed nut. A wrench may be used to do this. The tigh-
tening torque is 3-7 Nm (2.2-5.2 ft-lbs).
6.0
MOUNTING INSTRUCTIONS
The applicable regulations pertaining to work
safety, accident prevention and securing the
construction site must be observed. Workers
and third party personnel shall wear or install fall arrest
equipment. Any third party need to be protected against
injuries and damages.
· The mounting design must be certified by a registered
professional engineer. The mounting design and
procedures must comply with local codes and
requirements from all relevant authorities.
· CSI Solar Co., Ltd. does not provide mounting hardware.
· The system designer and installer are responsible for load
calculations and for proper design of support structure.
· The loads described in this manual correspond to test
loads. For installations complying with UL 1703 or UL
1. To x the wire between
the at washer and
cup washer, place the
cup washer (concave
side up) between the
frame and the wire.
2. Then tighten the bolt
using the toothed nut.
GROUNDING METHOD:
BOLT + TOOTHED NUT + CUP WASHER.
61730 and IEC 61215-2:2016, a safety factor of 1.5 should
be applied for calculating the equivalent maximum autho-
rized design loads. Project design loads depend on cons-
truction, applicable standards, location and local climate.
Determination of the design loads is the responsibility of
the racking suppliers and/or professional engineers. For
detailed information, please follow local structural code or
contact your professional structural engineer.
· Use appropriate corrosion-proof fastening materials. All
mounting hardware (bolts, spring washers, flat washers,
nuts) should be hot dip galvanized or stainless steel.
· Use a torque wrench for installation.
· Do not drill additional holes or modify the module frame.
Doing so will void the warranty.
WHEN CLAMPS ARE USED AS FIXING MATERIAL:
· Install and tighten the module clamps to the mounting
rails using the torque stated by the mounting hardware
manufacturer. System designer and installer are respon-
sible for load calculations and for proper design of sup-
port structure. It is recommended to use a torque wrench
for installation. Tightening torques must respectively be
within 17-23 Nm (12.5-17.0 ft-lb) for M8x1.25-Grade8.8
(5/16”-18 Grade B7) galvanized or A2-70 stainless steel
coarse thread bolts, depending on bolt class. The yield
strength of bolt and nut should not be less than 450 MPa.
· Clamp material should be anodized aluminum alloy or
steel of appropriate grade.
· Clamp positions are of crucial importance for the reliability
of the installation, the clamp centerline must only be
positioned within the authorized position ranges indicated
below, depending on the configuration and load.

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6.1
MOUNTING METHODS FOR FRAMED BIFACIAL
MODULE (BOLTING)
· The mounting method has been qualified by CSI Solar Co.,
Ltd., as well as certified by VDE and CSA.
· Modules should be bolted to support structures through
the mounting holes in the rear frame flanges only.
· Each module must be securely fastened at a minimum of
4 points on two opposite sides.
M8 X 1.25 (5/16”) bolt and nut should be used.
Plain washer size should be M8 with outer diameter
16 mm.
The yield strength of bolt and nut should not be less than
450 MPa.
Suitable bolt length should be chosen
based on actual module frame height.
For bifacial module with 30 mm frame height, our re-
commended maximum bolt length is 20 mm in order to
properly insert the bolts through the mounting hole. The
system designer is responsible to check that the racking
supplier specified bolt length comply with above require-
ment and will not affect installation.
· Tightening torques should be within 17-23 Nm (12.5-17.0
ft-lbs) for M8 (5/16”) coarse thread bolts, depending on
bolt class.
· In areas with heavy wind loads, additional mounting
points should be used. The system designer and the ins-
taller are responsible for calculating the load and ensuring
that the support structure meets the requirements.
· Modules should be bolted at the following hole locations
depending on the configuration and load:
Bolt
Frame
Nut
Spring
Washer
Washer
Washer
Rail

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CS3U-MB-AG, CS3U-PB-AG, CS3W-PB-AG and CS3W-MB-AG
Bolting on long frame side using four middle mounting
holes. Mounting rails run parallel to the long frame side.
Bolting on long frame side using four middle mounting
holes. Mounting rails run perpendicularly to the long
frame side.
Maximum Load:
Uplift load ≤ 2400 Pa
Downforce load ≤ 3600 Pa
Maximum Load:
Uplift load ≤ 2400 Pa
Downforce load ≤ 5400 Pa
CS3K-MB-AG and CS3K-PB-AG
Bolting on long frame side using four innermost moun-
ting holes. Mounting rails run parallel to the long frame
side.
Bolting on long frame side using four innermost moun-
ting holes. Mounting rails run perpendicularly to the long
frame side.
Maximum Load:
Uplift load ≤ 2400 Pa
Downforce load ≤ 3600 Pa
Maximum Load:
Uplift load ≤ 2400 Pa
Downforce load ≤ 5400 Pa
CS3Y-MB-AG AND CS3Y-PB-AG
Bolting on long frame side using four outermost moun-
ting holes.
Mounting rails run perpendicularly to the long frame
side.
Bolting on long frame side using four outermost moun-
ting holes.
Mounting rails run parallel to the long frame side.
Maximum Load:
Uplift load ≤ 2400 Pa
Downforce load ≤ 5400 Pa
Maximum Load:
Uplift load ≤ 2400 Pa
Downforce load ≤ 3600 Pa

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EN-Rev IM/GN-BM-EN/1.71 Copyright © December 2020. CSI Solar Co., Ltd.
6.2
MOUNTING METHODS FOR FRAMED BIFACIAL
MODULE (CLAMPING)
· The mounting method has been qualified by CSI Solar Co.,
Ltd. 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 symmetrically. The clamps should be positio-
ned according 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 moun-
ting hardware manufacturer. 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, de-
pending on the bolt class. For the bolt grade, the technical
guideline from the fastener suppliers should be followed.
Different recommendations from specific clamping hard-
ware suppliers should prevail.
· The system designer and installer are responsible 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
· CSI Solar Co., Ltd.’s warranty may be void in cases where
improper clamps or unsuitable installation methods are
found. When installing inter-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 exception
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 relia-
bility 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.
Min. 5 mm
overlap
Min. 3 mm thickness
Min. overlap length
40 mm
Overlap
10 ± 2 mm
Clamp
Rail
Module frame

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Use 4 clamps on the long side.
Mounting rails run parallel to the long side frame.
Use 4 clamps on the long side.
Mounting rails run perpendicular to the long side
frame.
Clamp length ≥ 40 mm
A = 410 - 490 mm
C = 10 ± 2 mm (overlap between the rail and module
frame)
Maximum Load:
Uplift load ≤ 2400 Pa
Downforce load ≤ 3600 Pa
Clamp length ≥ 80mm
A = 410 - 490 mm
Maximum Load:
Uplift load ≤ 3600 Pa
Downforce load ≤ 5400 Pa
Use 4 clamps on the short side.
Mounting rails run perpendicular to the long side
frame.
Use 4 clamps on the long side.
Mounting rails run parallel to the long side frame
A range = 200 - 250 mm
Maximum Load:
Uplift load ≤ 1000 Pa
Downforce load ≤ 1000 Pa
Clamp length ≥ 80 mm
A = 410 - 490 mm
C = 10 ± 2 mm (overlap between the rail and module
frame)
Maximum Load:
Uplift load ≤ 3600 Pa
Downforce load ≤ 4400 Pa
Notice: Only applicable to modules with matching
frame profiles on both the long and short sides
A range = 0 - 200 mm
Maximum Load:
Uplift load ≤ 800 Pa
Downforce load ≤ 800 Pa
AA
AA
CS3W-PB-AG and CS3W-MB-AG
A A

16 |
EN-Rev IM/GN-BM-EN/1.71 Copyright © December 2020. CSI Solar Co., Ltd.
Use 4 clamps on the long side.
Mounting rails run parallel to the long side frame.
Use 4 clamps on the long side.
Mounting rails run perpendicular to the long side
frame.
Clamp length ≥ 40 mm
A = 410 - 490 mm
C = 10 ± 2 mm (overlap between the rail and module
frame)
Maximum Load:
Uplift load ≤ 2400 Pa
Downforce load ≤ 3600 Pa
Clamp length ≥ 80mm
A = 410 - 490 mm
Maximum Load:
Uplift load ≤ 3600 Pa
Downforce load ≤ 5400 Pa
Use 4 clamps on the short side.
Mounting rails run perpendicular to the long side
frame.
Use 4 clamps on the long side.
Mounting rails run parallel to the long side frame
A range = 200 - 250 mm
Maximum Load:
Uplift load ≤ 1000 Pa
Downforce load ≤ 1000 Pa
Clamp length ≥ 80 mm
A = 410 - 490 mm
C = 10 ± 2 mm (overlap between the rail and module
frame)
Maximum Load:
Uplift load ≤ 3200 Pa
Downforce load ≤ 3800 Pa
Notice: Only applicable to modules with matching
frame profiles on both the long and short sides
A range = 0 - 200 mm
Maximum Load:
Uplift load ≤ 800 Pa
Downforce load ≤ 800 Pa
AA
AA
CS3U-MB-AG and CS3U-PB-AG
AA

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AA
AA
CS3K-MB-AG and CS3K-PB-AG
Use 4 clamps on the long side.
Mounting rails run parallel to the long side frame.
Use 4 clamps on the long side.
Mounting rails run perpendicular to the long side fra-
me.
Clamp length ≥ 40 mm
A = 270 – 380 mm
C = 10 ± 2 mm (overlap between the rail and module
frame)
Maximum Load:
Uplift load ≤ 2400 Pa
Downforce load ≤ 3600 Pa
Clamp length ≥ 80mm
A = 270 – 380 mm
Maximum Load:
Uplift load ≤ 3600 Pa
Downforce load ≤ 5400 Pa
Use 4 clamps on the short side.
Mounting rails run perpendicular to the long side
frame.
Use 4 clamps on the long side.
Mounting rails run parallel to the long side frame
Clamp length ≥ 40 mm
A range = 200 - 250 mm
Maximum Load:
Uplift load ≤ 2000 Pa
Downforce load ≤ 2400 Pa
Notice: Only applicable to modules with matching
frame profiles on both the long and short sides
Clamp length ≥ 80 mm
A= 270 – 380 mm
C= 10 ± 2 mm (overlap between the rail and module
frame)
Maximum Load:
Uplift load ≤ 3200 Pa
Downforce load ≤ 3800 Pa
Notice: Only applicable to modules with matching
frame profiles on both the long and short sides
Clamp length ≥ 40 mm
A= 0 – 200 mm
Maximum Load:
Uplift load ≤ 1800 Pa
Downforce load ≤ 2200 Pa
Notice: Only applicable to modules with matching
frame profiles on both the long and short sides
A A

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EN-Rev IM/GN-BM-EN/1.71 Copyright © December 2020. CSI Solar Co., Ltd.
6.3
MOUNTING METHODS FOR FRAMED BIFACIAL
MODULE (SINGLE-AXIS TRACKER)
· The bolts and clamps used in this section should follow
the requirements in 6.3 and 6.4.
· Under any conditions the junction box cannot become
in contact with the subjacent racking structure. If any
racking structures, especially bearing house, have to be
located under the modules, the gap between the junction
box and the racking structure should be at least 30 mm
(BiKu) and 50 mm (BiHiKu).
· If your tracker design cannot meet the above distance
requirement, please contact CSI Solar Co., Ltd. technical
support department in writing for advices.
AA
AA
CS3Y-MB-AG and CS3Y-PB-AG
Use 4 clamps on the long side.
Mounting rails run parallel to the long side frame.
Use 4 clamps on the long side.
Mounting rails run perpendicular to the long side
frame.
Clamp length ≥ 80 mm
A= 400 - 550 mm
C= 10 ± 2 mm (overlap between the rail and module
frame)
Maximum Load:
Uplift load ≤ 3200 Pa
Downforce load ≤ 4400 Pa
Clamp length ≥ 40 mm
A= 300 - 600 mm
Maximum Load:
Uplift load ≤ 2400 Pa
Downforce load ≤ 3600 Pa
Clamp length ≥ 80 mm
A= 400 - 550 mm
Maximum Load:
Uplift load ≤ 3600 Pa
Downforce load ≤ 5400 Pa
Module
Type
Mounting Hole
Space
Fixed
Mounting
Hole
Location
Plain Was-
her Outer
Diameter
(mm)
Test Load
(Pa)
CS3W-PB-AG
CS3W-MB-AG
A1-A3: 400 mm
B1-B3: 1155 mm
A1, A2, A3, A4 16 +2400 / -2200
A1, A2, A3, A4
B1, B2, B3, B4 16 +3000 / -2800
CS3Y-PB-AG
CS3Y-MB-AG
A1-A3: 400 mm
B1-B3: 790 mm
A1, A2, A3, A4 16 +2400 / -1800
A1, A2, A3, A4
B1, B2, B3, B4 16 +2800 / -2800
TRACKER 1P BOLTING METHOD

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TRACKER 1P CLAMPING METHOD
Module
Type
Mounting Hole
Space
Mounting Hole
Location
Plain Washer
Outer Dia-
meter (mm)
Test Load
(Pa)
CS3W-PB-AG
CS3W-MB-AG
A1-A3: 400 mm
B1-B3: 1155 mm
C1-C3: 1300 mm
C1, C2, A3, A4 16 ±1800
B1, B2, B3, B4 16 +2600 / -2400
CS3Y-PB-AG
CS3Y-MB-AG A1-A3: 400 mm
B1-B3: 790 mm
B1, B2, A3, A4 16 +1800 / -1200
B1, B2, B3, B4 16 +2400 / -1400
TRACKER 2P BOLTING METHOD
Module
Type B Value Test Load (Pa) Clamp length C
CS3W-PB-AG
CS3W-MB-AG 300 mm + 2400 / - 1800
≥ 40 mm
CS3Y-PB-AG
CS3Y-MB-AG
300 mm ± 1600
400 mm ± 1800
600 mm ± 2400 ≥ 80 mm
Overlap width between clamp and frame:
Frame top side ≥ 10 mm
Frame bottom side ≥ 15 mm
B
C
Rail
Tube
Clamp

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EN-Rev IM/GN-BM-EN/1.71 Copyright © December 2020. CSI Solar Co., Ltd.
The following tracker manufacturers and types are appro-
ved with CSI Solar framed bifacial modules.
Module Type Compatible
Tracker Mounting Hardware Maximum Load (Pa)
Reference Manual
(Version No.)
CS3U-MB-AG
CS3U-PB-AG
ATI DuraTrack™HZ
Tracking
System(V3)
Standard 300 mm clamp
20563/20751
Hi-rise 300 mm clamp-20822
Hi-rise 400 mm clamp-20834
Uplift load
≤ 2400 Pa
Downforce load
≤ 2400 Pa
DuraTrack HZ Solar
Tracker Installation
Guide
CS3Y-MB-AG
CS3Y-PB-AG
ATI DuraTrack™HZ
Tracking
System(V3)
Hi-rise 400 mm clamp-20857
Clamp Ear 80 mm
Uplift load
≤ 1800 Pa
Downforce load
≤ 1800 Pa
DuraTrack HZ Solar
Tracker Installation
Guide
CS3U-MB-AG
CS3U-PB-AG
NEXTracker
NX Horizon
Short Rail V2.4.9
(400 mounting holes position)
Rail part No: 21190, 21191
Uplift load
≤2400 Pa
Downforce load
≤ 2400 Pa
NEXTracker NX
Horizon 2.4 Short
Rail Installation
Manual
CS3Y-MB-AG
CS3Y-PB-AG
NEXTracker NX
Horizon
400 mm frame hole attachment.
Uses V2.4.10 rail + 4x bobtails
(head O.D. 16.8 mm)
Uplift load
≤ 2000 Pa
Downforce load
≤ 1800 Pa
NEXTracker NX
Horizon 2.4 Rail
Installation Manual
CS3U-MB-AG
CS3U-PB-AG
Arctech
single-axis tracker
Portrait one row
440 mm rail (bolting method /
M6 bolt + M6 spring washer + M6
plain washer (O.D. = 18 mm) /
400 mm holes position)
Drawing No: CS2018013
Uplift load
≤ 2400 Pa
Downforce load
≤ 2400 Pa
Skyline-Module
Fixing Installation
Manual
CS3U-MB-AG
CS3U-PB-AG
Arctech
single-axis tracker
Portrait two rows
3572 mm rail (bolting method /
M8 bolt + M8 plain washer
(O.D. = 16 mm) / 1155 mm holes
position) Drawing No: CS2018012B
Uplift load
≤ 2400 Pa
Downforce load
≤ 2400 Pa
SkySmart-Module
Fixing Installation
Manual
CS3U-MB-AG
CS3U-PB-AG
Soltec SF7 Single-
Axis Tracker
Portrait two rows
2556 mm rail (Bolting method /
M6 bolt + M6 plain washer (O.D.
= 18 mm) / 1300 mm + 400 mm
holes position) Drawing No: SF7-
MR-04-039_Drbiku-1800Pa-30mm
Uplift load
≤ 1800 Pa
Downforce load
≤ 1800 Pa
SF7QG-1500V-en
CS3U-MB-AG
CS3U-PB-AG
Soltec SF7 Single-
Axis Tracker
Portrait two rows
3311 mm long rail (bolting method/
M6 bolt + M6 plain washer
(O.D. = 18 mm) / 1155 mm holes
position) Rail Drawing No: SF7-
MR-04-040_Drbiku-2400Pa-30mm
Uplift load
≤ 2400 Pa
Downforce load
≤ 2400 Pa
SF7QG-1500V-en