INSTALLATION MANUAL OF BIFACIAL MODULE

CONTENTS

1.0 GENERAL INFORMATION
1.1 INSTALLATION MANUAL DISCLAIMER
1.2 LIMITATION OF LIABILITY
2.0 SAFETY PRECAUTIONS
3.0 MECHANICAL / ELECTRICAL SPECIFICATIONS
4.0 UNPACKING AND STORAGE
5.0 MODULE INSTALLATION
5.1 MODULE WIRING
5.2 GROUNDING
6.0 MOUNTING INSTRUCTIONS
6.1 MOUNTING METHODS FOR FRAMED BIFACIAL MODULE (Bolting)
6.2 MOUNTING METHODS FOR FRAMED BIFACIAL MODULE (Clamping)
6.3 MOUNTING METHODS FOR FRAMED BIFACIAL MODULE (SINGLE-AXIS TRACKER)
7.0 MAINTENANCE
8.0 Module Cleaning Guidelines
ANNEX A: MECHANICAL AND ELECTRICAL RATINGS
AMENDED EDITIONS AND DATES

1.0 GENERAL INFORMATION
This general manual provides important safety information relating to the installation, maintenance and handling of bifacial double glass solar modules.
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 require professional skills and should only be performed by qualified professionals. The installers must inform end-users (consumers) the aforesaid information 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, CS3Y-PB-AG, CS6W-MB-AG, CS7N-MB-AG and CS7L-MB-AG. Please retain this manual for future reference.
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 Canadian Solar without prior notice. Canadian Solar gives no warranty of any kind whatsoever, either explicitly or implicitly, with respect to the information contained herein.
In the event of any inconsistency among different language versions of this document, the English version shall prevail. Please refer to our product lists and documents published on our website at: www.csisolar.com as these lists are updated on a regular basis.

1.2 LIMITATION OF LIABILITY
Canadian Solar shall not be held responsible for damages 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 to the applicable electrical codes such as, the latest National Electrical Code (USA) or Canadian Electric Code (Canada) or other national or international applicable electrical codes.

	Protective clothing (non-slip gloves, clothes, etc.) must be worn during installation to prevent direct contact with 30 V DC 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 connector.
	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 protection devices (OCPDs) cannot be opened or the inverter cannot be powered down, cover the fronts of the modules in the PV array with an opaque material to stop the production of electricity when installing or working on a module or wiring.
Carry the panels using both hands and do not use the junction box or cables as a grip
Do not allow the panels to sag or bow under their own weight when being carried.
Do not subject panels to loads or stresses, e.g., leaning on them or through the placing of weight on them.
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 attempt to repair any part of the module The PV module does not contain any serviceable parts.
Do not open the cover of the junction box at any time.
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 AM1.5 spectrum, and a cell temperature of 25°C. Detailed electrical and mechanical characteristics of Canadian Solar crystalline silicon PV modules can be found in Annex A (Module Specifications) on www.csisolar.com. Main electrical characteristics at 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 current or voltage than its Standard Test Conditions rated power. As a result, the module short-circuit current under STC should be multiplied by 1.25, and a correction factor should be applied to the open-circuit voltage (see Table 1 below), when determining component ratings and capacities.

Table 1: Low temperature correction factors for open-circuit voltage

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 (%/°C) is the voltage temperature coefficient of the selected 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 UL61730 standard 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 Canadian Solar bifacial module types.

The minimum string fuse rating for compliance with NEC: 2017 code and IEC 62548: 2016 requirement is suggested 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 elevation and orientation.
IscSTC = the listed short circuit current at 0% bifacial gain on the PV module datasheet or nameplate label.
ImppSTC = the listed MPP operating current at 0% bifacial 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.

Electrical calculations and design must be performed by a competent engineer or consultant.

Please contact Canadian Solar’s technical support team for additional information pertaining to engineering optimization and approval of project specific module string lengths.

4.0 UNPACKING AND STORAGE

PRECAUTIONS

Modules should be stored in a dry and ventilated environment to avoid direct sunlight and moisture. If modules are stored in an uncontrolled environment, the storage time should be less than 3 months and extra precautions should be taken to prevent connectors from being exposed to moisture or sunlight, like using connector endcaps. . Connector endcaps are available upon request.
When unloading module pallets from containers, please use a fork lift to remove the module pallets and the forklift should be close to the ground in order to avoid the top of module pallets touching the top of the cabinet door. For 6W-MB-AG, the thickness of forklift teeth should be less than 75mm and the length of the forklift teeth should be longer than 2300mm when unloading the module pallets with short side. For unloading CS7N-MB-AG and CS7L-MB-AG modules, the length of the forklift teeth should be longer than 1250mm and the width of forklift teeth should be wider than 600mm (from outer edge to outer edge).
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 two people. Always use both hands when handling modules with gloves.

For vertical package, unpacking and installing should be careful, for more information, please contact Canadian solar technical support team.

Do not lift modules by their wires or junction box, lift them by the frame.
Do not place excessive loads on the module or twist the module.
Do not carry modules on your head.
Do not drop or place objects (such as tools) on the modules.
Do not use sharp instruments on the modules.
Do not leave modules unsupported or unsecured.
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 Canadian Solar’s warranty.

Do not change the wiring of bypass diodes.
Keep all electrical contacts clean and dry at all times.
Do not expose the modules and its electrical contacts to any unauthorized chemical substance (e.g. oil, lubricant, pesticide, etc.).

PRODUCT IDENTIFICATION

Each module has three identical barcodes (one in the laminate under the front glass, the second on the rear side of the module and the third on the frame) that act as a unique identifier. Each module has a unique serial number containing 14 digits or 16 digits.
A nameplate is also affixed to the rear of each module. This nameplate specifies the model type, as well as the main electrical and safety characteristics of the module.

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 construction or structure (roof, facade, support, etc.) can bear the module system load.
Canadian solar modules have been qualified for Application Class A (equivalent to Safety Class II requirements). Modules rated under this class should be used in systems operating at voltage above 50V or power above 240W, where general contact access is anticipated.
Canadian Solar bifacial double glass modules have been certified as Type 29 according to UL 61730 and as Class A or Class C for fire performance according to IEC 61730-2 for fire class performance, please refer to the datasheet or the product nameplate for the detailed types.
Consult your local authority for guidelines and requirements for building or structural fire safety.
UL61730 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.
Photovoltaic systems composed of UL 61730 certified modules mounted on a UL 2703 certified mounting system should be evaluated in combination with roof coverings in accordance with 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 29” rated modules, are considered acceptable for use with Canadian Solar modules, provides the mounting system does not violate any other requirements of this manual.
Any mounting system limitations on inclination or accessories required to maintain a specific System Fire Class Rating should be clearly specified in the installation instructions and UL 2703 certification of the mounting system supplier.

ENVIRONMENTAL CONDITIONS

The module is intended for use in general open-air climates, as defined in IEC 60721-2-1: Classification of environmental conditions Part 2-1: Environmental conditions appearing in nature. Temperature and humidity.
Please consult the Canadian Solar technical support department for more information on the use of modules in special climates, such as an altitude greater than 2000m, 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 unauthorized chemical substances (e.g. oil, lubricant, pesticide, etc.), as modules may incur damages.
Canadian solar modules have passed salt mist corrosion resistance test according to IEC 61701, but the corrosion may still occur on where the modules frame is connected to the bracket or where the grounding is connected. Should the installation location be near the ocean, Canadian solar recommends stainless steel or aluminum materials be used in the areas with direct contact with the PV modules, and the connection point should be protected with anti-corrosion measures. For more information, please contact Canadian solar technical support team.
CS7L-MB-AG & CS7N-MB-AG modules shall not be used in any rooftop application.
Failure to comply with these instructions will void Canadian Solar warranty.

INSTALLATION REQUIREMENTS

Ensure that the module meets the general technical system requirements.
Ensure that other systems components do not damage the module 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 cables from the positive terminal of 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.
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 expansion of the frames and modules.

OPTIMUM ORIENTATION AND TILT

To maximize the annual yield, please calculate the 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.
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 circulate around the back of the module. This also allows condensation or moisture to dissipate.
According to UL61730, 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

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 string should be kept under open-circuit conditions and proper actions should be taken to avoid dust and moisture penetration inside the connectors.
Do not connect different connectors (brand and model) together.
For CS3W, CS3U, CS3Y, CS3K, CS6W, CS7N and CS7L series modules, Canadian Solar offers several cable length options to match various 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 below table is used, please confirm suitable cable length with Canadian Solar’s sales representative.

Table 2: System Cable Scheme for CS3W, CS3U, CS3Y, CS3K, CS6W, CS7N and CS7L modules

Module types	Recommended wiring configurations
CS3U-MB-AG, CS3K-MB-AG, CS3U-PB-AG, CS3K-PB-AG, CS3W-PB-AG, CS3W-MB-AG, CS3Y-PB-AG, CS3Y-MB-AG, CS6W-MB-AG, CS7N-MB-AG, CS7L-MB-AG	Landscape installation two rows: CS3U/CS3W/CS3Y/CS6W/CS7L/CS7N Cable length per lead = 1400 mm CS3K Cable length per lead = 1250 mm
	Note: 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/CS6W Cable length per lead = 410 mm (+), 290 mm (-) CS7L/CS7N Cable length per lead = 460 mm (+), 340 mm (-)

CS3U-MB-AG, CS3K-MB-AG, CS3U-PB-AG, CS3K-PB-AG, CS3W-PB-AG, CS3W-MB-AG, CS3Y-MB-AG, CS3Y-PB-AG, CS6W-MB-AG, CS7N-MB-AG, CS7L-MB-AG	Portrait installation two rows: CS3U/CS3W Cable length = 400 mm (+), 280 mm (-) & 1800 mm jumper cable CS3K Cable length = 400 mm (+), 280 mm(-) & 1400 mm jumper cable CS3Y/CS6W Cable length = 410 mm (+), 290 mm (-) & 2000 mm jumper cable CS7L Cable length = 460 mm (+), 340 mm (-) & 2000 mm jumper cable CS7N Cable length = 460 mm (+), 340 mm (-) & 2150 mm jumper cable
	Note: Modules in adjacent rows need to be rotated 180 degrees for proper installation.
CS3U-MB-AG, CS3K-MB-AG, CS3U-PB-AG, CS3K-PB-AG, CS3W-PB-AG, CS3W-MB-AG, CS3Y-MB-AG, CS3Y-PB-AG CS6W-MB-AG	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 (-) CS6W Cable length = 2000 mm (+), 2000 mm (-)

The maximum distance between two adjacent module frames should be within 50 mm (1.96 in) for the side with mounting clamps, and within 25 mm (0.98in) for the side without mounting clamps, in order to meet the system cable scheme.

CORRECT CONNECTION OF CONNECTORS

Make sure that all connections are safe and properly mated. The PV connector should not be subject 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, connector 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 lubricants or any unauthorized chemical substances.

USE OF SUITABLE MATERIALS

Only use dedicated solar cable and suitable connectors (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 PV wire which is 90°C wet rated in North America, and single conductor cable with a cross section area of at least 4mm² (12 AWG), 90°C wet rated in other areas (i.e.IEC 62930: 2017 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 60 mm (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 easily accumulate.

5.2 GROUNDING

For grounding requirements in North America, a module with exposed conductive parts is considered to comply with UL61730 only when it is electrically grounded in accordance with both the instructions presented below and the requirements of the National Electrical Code. Any grounding means used with Canadian Solar 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 regulations. Minimum size of equipment grounding conductors for ground raceway and equipment from NEC 690.8(D) should be considered. 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 (IEC 61730-1). 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.
Canadian Solar does not provide grounding hardware.
The grounding method described below is recommended for Canadian Solar.

GROUNDING METHOD: BOLT + TOOTHED NUT + CUP WASHER.

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) is 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 frame, in order to enable the equipment grounding function when required.
Place the wire between the flat washer and the cup washer. 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 tightening 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 all applicable local codes and requirements from all relevant authorities.
The loads described in this manual correspond to test loads. For installations complying with UL 61730 and IEC 61215-2:2016, a safety factor of 1.5 should be applied for calculating the equivalent maximum authorized design loads. Project design loads depend on construction, 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 responsible for load calculations and for proper design of support structure. It is recommended to use a torque
wrench for installation. Tightening torques must respectively be within 16~20 Nm (11.8~14.75 ft-lbs) for M8 x 1.25-Grade 8.8 (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.

6.1 MOUNTING METHODS FOR FRAMED BIFACIAL MODULE (Bolting)

The mechanical load test with these mounting methods were performed according to IEC 61215.
Modules should be bolted to supporting 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 450MPa.

Suitable bolt length should be chosen based on actual module frame height. For bifacial module with 30 mm frame height, our recommended 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 requirement and will not affect installation.

Tightening torques should be within 16~20 Nm (11.8~14.75 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 installer are responsible for correctly calculating the loads and ensuring that the supporting structure meets all the applicable requirements.

Mounting method: Bolting

Modules should be bolted at the following hole locations depending on the configuration and loads:

Table 3: Approved bolting methods

Inner four holes installation method A	Middle four holes installation method A	Outer four holes installation method A

Inner four holes installation method B	Middle four holes installation method B	Outer four holes installation method B

Note: The installation method of bolt is based on the experimental results, “/” means not tested.

6.2 MOUNTING METHODS FOR FRAMED BIFACIAL MODULE (Clamping)

The mechanical load test with these mounting methods were performed according to IEC 61215.
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 positioned 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 mounting 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 450 MPa.
Tightening torques should be within 16~20 Nm (11.8~14.75 ft-lbs) for M8 (5/16”-18 Grade B7) coarse thread bolts, depending on the bolt class. For the bolt grade, the technical guideline from the fastener suppliers should be followed. Different recommendations from specific clamping hardware 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.
Canadian Solar’s warranty may be void in cases where improper clamps or unsuitable installation methods are found. When installing inter-modules or end-type clamps, please take the following measures into account:
1. 1. Do not bend the module frame.
  2. Do not touch or cast shadows on the front glass.
  3. Do not damage the surface of the frame (to the exception of the clamps with bonding pins).
  4. Ensure the clamps overlap the module frame by at least 10 mm (0.4 in) for CS6W, CS7N, CS7L, and 5mm /0.2in) for others.
  5. Overlap in length by at least:
    1. 1. 80 mm (3.15 in) when 2400 Pa < uplift load ≤ 4000 Pa is required.
      2. 40 mm (1.57 in) when uplift load ≤ 2400 Pa is required.
  6. Ensure the clamp thickness is 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 at least 15 mm (0.59 in) for CS6W, CS7N, CS7L, and 10 mm (0.4 in) for other module series.

6.2.1 Clamp mounting on long side of frame and rails perpendicularly to the long side frame

Module Types	Max Mechanical Load (Pa)
	+3600/-2400	+5400/-2400	+5400/-3600
	A Range (mm)
CS3K	/	/	270-380
CS3U	/	/	410-490
CS3W	/	/	410-490
CS3Y	300-600	/	400-550
CS6W	300-600	400-500	/
CS7N/CS7L	/	400-500	/

6.2.2 Clamp mounting on short side of frame and rails perpendicular to the long side frame.

Module Types	A Range (mm)
	0-200	200-250
	Max Mechanical Load (Pa)
CS3K	+2200/-1800	+2400/-2000
CS3U / CS3W	+800/-800	+1000/-1000

6.2.3 Clamp mounting on long side of frame and rails parallel to the long side frame.

Module Types	Max Mechanical Load (Pa)
	+3600/-2400	+3800/-3200	+4000/-3200	+4400/-3200	+4400/-3600
	A1 Range (mm)
CS3K	/	270-380	/	/	/
CS3U	/	410-490	/	/	/
CS3W	/	/	/	/	410-490
CS3Y	/	/	/	400-550	/
CS6W	/	/	400-500	/	/
CS7N/CS7L	400-500	/	/	/	/

6.3 MOUNTING METHODS FOR FRAMED BIFACIAL MODULE (SINGLE-AXIS TRACKER)

The bolts and clamps used in this section should follow the requirements in 6.1 and 6.2.
Under any conditions the junction box should not become in contact with the subjacent racking structure except torque tube. If any racking structures, especially bearing house, have to be located under the modules, the distance H between the frame and the racking structure should be at least 40mm.

If your tracker design cannot meet the above distance requirement, please contact Canadian Solar technical support department in writing for advice.

Tracker 1P Bolting method

Install and tighten the module clamps to the mounting rails using the torque stated by the mounting hardware manufacturer. M6 X 1 (1/4”) bolt and nut are used for this bolting method.
Tightening torques should be 6~9 Nm (4.5~6.6 ft-lbs) M6 X 1 (1/4”) coarse thread bolts, depending on bolt class.

Module type	Mounting hole space (mm)	Fixed mounting hole location	Plain washer outer diameter (mm)	Distance H (mm)	Test load (Pa)
CS3W-PB-AG CS3W-MB-AG	A1-A3: 400 B1-B3: 1155	A1, A2, A3, A4	16	<80	+2400/-2400
CS3W-PB-AG CS3W-MB-AG	A1-A3: 400 B1-B3: 1155	A1, A2, A3, A4 B1, B2, B3, B	16	≥80	+3000/-2800
CS3Y-PB-AG CS3Y-MB-AG	A1-A3: 400 B1-B3: 790	A1, A2, A3, A4	16	<80	+2400/-2200
CS3Y-PB-AG CS3Y-MB-AG	A1-A3: 400 B1-B3: 790	A1, A2, A3, A4 B1, B2, B3, B4	16	≥80	+2800/-2800
CS6W-MB-AG	A1-A3: 400 B1-B3: 790	A1, A2, A3, A4	16	<80	+2000/-1800
CS6W-MB-AG	A1-A3: 400 B1-B3: 790	B1, B2, B3, B4	16	≥80	+2400/-2200
CS7L-MB-AG	A1-A3: 400 B1-B3: 790	A1, A2, A3, A4	16	<80	+2400/-2100
CS7L-MB-AG		B1, B2, B3, B4	16	≥80	+2800/-2100
CS7N-MB-AG		A1, A2, A3, A4	16	<80	+2400/-2100
CS7N-MB-AG		B1, B2, B3, B4	16	≥80	+2600/-2100

Tracker 1P Clamping method

Overlap width between clamp and frame: Frame top side ≥ 10mm Frame bottom side ≥ 15mm	Module type	B Value (mm)	Clamp length C (mm)	Test load (Pa)
	CS3W-PB-AG CS3W-MB-AG	≥400	≥40	+2400/-1800
	CS3W-PB-AG CS3W-MB-AG	≥400	≥80	+2400/-2400
	CS3Y-MB-AG CS3Y-PB-AG CS6W-MB-AG	≥400	≥40	+1800/-1800
	CS3Y-MB-AG CS3Y-PB-AG CS6W-MB-AG	≥600	≥80	+2400/-2400
	CS7L-MB	≥400	≥40	+2100/-2100
	CS7L-MB	≥600	≥80	+2400/-2400
	CS7N-MB	≥400	≥40	+1800/-1800
	CS7N-MB	≥600	≥80	+2100/-2100

Tracker 2P Bolting method

Module type	Mounting hole space (mm)	Mounting hole location	Plain washer outer diameter (mm)	Test load (Pa)
CS3W-PB-AG CS3W-MB-AG	A1-A3: 400 B1-B3: 1155	B1, B2, A3, A4	16	+1800/-1600
CS3W-PB-AG CS3W-MB-AG	A1-A3: 400 B1-B3: 1155	B1, B2, B3, B4	16	+2200/-2000
CS3Y-MB-AG CS3Y-PB-AG CS6W-MB-AG CS7L-MB-AG CS7N-MB-AG	A1-A3: 400 B1-B3: 790	B1, B2, A3, A4	16	+1800/-1600
CS3Y-MB-AG CS3Y-PB-AG CS6W-MB-AG CS7L-MB-AG CS7N-MB-AG	A1-A3: 400 B1-B3: 790	B1, B2, B3, B4	16	+2200/-2000

The allowable maximum twist angle of the module is 0.5 degree.
Please contact the tracker manufacturer and Canadian Solar’s technical support department for details in regard to specific projects.

7.0 MAINTENANCE

Do not make modifications to any component of the PV module (diode, junction box, connectors or others).
Regular maintenance is required to keep modules clear of snow, bird droppings, seeds, pollen, leaves, branches, dirt spots, and dust.
Modules with sufficient tilt (at least 15°), generally may not require cleaning (rain will have a self-cleaning effect). If the module has become soiled, wash with water and a non-abrasive cleaning implement (sponge) during the cool part of the day. Do not scrape or rub dry dirt away, as this may cause micro scratches.
Snow should be removed using a soft brush.
Periodically inspect the system to check the integrity of all wiring and supports.
To protect against electric shock or injury, electrical or mechanical inspections and maintenance should be performed by qualified personnel only.

8.0 Module Cleaning Guidelines

This manual covers the requirements for the cleaning procedure of Canadian Solar‘s photovoltaic modules. The purpose of these cleaning guidelines is to provide general information for cleaning Canadian Solar modules. System users and professional installers should read these guidelines carefully and strictly follow these instructions.
Failure to follow these instructions may result in death, injury or damage to the photovoltaic modules. Damages induced by inappropriate cleaning procedures will void Canadian Solar warranty.

SAFETY WARNING

Cleaning activities create risk of damaging the modules and array components, as well as increasing the potential electric shock hazard.
Cracked or broken modules represent an electric shock hazard due to leakage currents, and the risk of shock is increased when modules are wet. Before cleaning, thoroughly inspect modules for cracks, damage, and loose connections.
The voltage and current present in an array during daylight hours are sufficient to cause a lethal electrical shock.
Ensure that the circuit is disconnected before starting the cleaning procedure as contact with leakage of electrically active parts can result in injury.
Ensure that the array has been disconnected to other active components (such as inverter or combiner boxes) before starting with the cleaning.
Wear suitable protection (clothes, insulated gloves, etc.).
Do not immerse the module, partially or totally, in water or any other cleaning solution.
Rear side cleaning of the modules is not required, if cleaning the rear of a module is desired, care should be taken to ensure there is no damage caused to the module by simply clearing the growth by hand or with a soft sponge.

HANDLING NOTICE

Use a proper cleaning solution and suitable cleaning equipment.
Do not use abrasive or electric cleaners on the module.
Particular attention should be taken to avoid the module rear glass or frame to come in contact with sharp objects, as scratches may directly affect product safety.
Do not use abrasive cleaners, de-greasers or any unauthorized chemical substance (e.g. oil, lubricant, pesticide, etc.) on the module.
Do not use cleaning corrosive solutions containing hydrofluoric acid, alkali, acetone, or industrial alcohol. Only substances explicitly approved by Canadian Solar are allowed to be used for cleaning modules.
For cleaning methods using rotating brush, please consult with Canadian Solar's technical support before using.
Dirt must never be scraped or rubbed away when dry, as this will cause micro-scratches on the glass surface.

OPERATION PREPARATION

Noticeable dirt must be rubbed away by gentle cleaning implement (soft cloth, sponge or brush with soft bristles).
Ensure that brushes or agitating tools are not abrasive to glass, EPDM, silicone, aluminum, or steel.
Conduct the cleaning activities avoiding the hottest hours of the day, in order to avoid thermal stress on the module.

Canadian Solar recommends the use of:

Water with low mineral content
Near neutral pH water
The maximum water pressure recommended is 4 MPa (40 bar)

CLEANING METHODS

Method A: Compressed Air

Canadian Solar recommends cleaning the soft dirt (like dust) on modules just with air pressure. This technique can be applied as long as the method is efficient enough considering the existing conditions.

Method B: Wet cleaning

If excessive soiling is present on the module surface, a non-conductive brush, sponge, or other mild agitating method may be used with caution.

Ensure that any brushes or agitating tools are constructed with non-conductive materials to minimize risk of electric shock and that they are not abrasive to the glass or the aluminum frame.
If grease is present, an environmental friendly cleaning agent may be used with caution.

ANNEX A: MECHANICAL AND ELECTRICAL RATINGS

Standard Test Conditions are: Irradiance of 1000 W/m2, AM1.5 spectrum, and cell temperature of 25°C. The tolerance of electrical characteristics is respectively within ±3% for Pmax, and ±5% for Isc & Voc. Specifications are subject to change without notice.

Table A: Mechanical and electrical ratings under STC

AMENDED EDITIONS AND DATES

Rev 1.2 is released in June, 2019.
Rev 1.21 is released in July, 2019.
Rev 1.3 is released in September, 2019.
Rev 1.4 is released in December, 2019.
Rev 1.4 is released in December, 2019.
Rev 1.5 is released in April, 2020.
Rev 1.6 is released in May, 2020.
Rev 1.7 is released in December, 2020.
Rev 1.71 is released in December, 2020.
Rev 1.8 is released in March, 2021.
Rev 1.9 is released in June, 2021.

CSI_IM_Modules_Double-Glass_v2.5_Pt-BR.pdf
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