Sunerg Solar Energy XMCH66400BW+H User manual

Single glass crystalline silicon PV Modules
installation manual
Rev.1_2022

Crystalline Silicon Solar Module Products Installation Manual (IEC)
1Scope
This installation manual specifies the installation and maintenance requirements for crystalline silicon PV
modules (hereinafter referred to as "solar modules") manufactured by Sunerg Solar. (hereinafter referred to as
"Sunerg" ).
This installation manual is intended for the installation and maintenance of solar modules (hereinafter
referred to as "solar modules"), and helps customers to correctly install the photovoltaic power generation
system, so that the design system can realize its potential. This installation manual does not apply to the
installation of the Sunerg double glass modules and conventional modules.
2The introduction of installation manual
2.1 Overview
Thanks for choosing the crystalline silicon PV module of Sunerg Solar This manual contains important
electrical and mechanical installation information. For correct installation and stable power output, please
install and maintain the modules Carefully read and understand all installation instructions in the manual, and
Keep this manual in a safe place for future reference (care and maintenance) and in case of sale or disposal of
the modules.
This manual does not constitute a warranty, expressed or implied. Sunerg does not assume responsibility
and expressly disclaims liability for loss, damage, or expense arising out of or in any way connected with
installation, operation, use or maintenance of modules.
The PV modules should be installed in accordance with all safety precautions and local laws and
regulations of this manual and should be installed and serviced by qualified personnel with knowledge of the
mechanical and electrical requirements of the system.
The mechanical and electrical installation of the PV modules shall be made in accordance with applicable
laws and regulations, including electrical, construction and electrical connection requirements. These
regulations vary depending on the installation site, such as building roofs, surface mounts, in-vehicle
applications, and so on. The requirements may vary depending on the installation system voltage, the use of
DC or AC. Please refer to the relevant local laws and regulations.
Any questions, please contact with the salesman or customer service personnel of Sunerg Solar for further
explanations.
2.2 Applicable products
This manual is intended for use with the following solar modules:
Monocrystalline PERC PV modules（Horizontal）: XMCH66400BW+H; XMCH120400B+H;
XMCH120410BW+H

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Module dimensions and electrical performance data are details in the corresponding technical
specifications.
3Product information
3.1 Section structure and component description of PV modules
1、Frame
2、Glass
3、EVA
4、Solar Cell
5、Backsheet
6、Adhesive
7、Junction box
8、Cable
9、Connector
10、Lable
11、Ground hole
12、Mounting hole
13、Drainage hole
14、Stiffener
Figure 1 Section structure and module description
3.2 Module tag information
Each PV module is affixed with two kinds of labels, providing the following information:
a) Label: Describes the product name, PV module model, nominal power, rated voltage, rated current,

open circuit voltage, short circuit current, maximum system voltage, PV module size and weight
under standard test conditions.
b) Series number: Each module has a unique bar code number, each bar code number has 20 letters and
numbers. The bar code is permanently encapsulated inside the module, as can be seen clearly from
the top right corner of the module. The bar code number allows you to trace information about the
module production process.
3.3 Module electrical performance parameters
The electrical performance parameters of the module were measured under standard test conditions
(irradiance of 1000 W / m², AM 1.5 spectra, ambient temperature of 25 ° C) with a test uncertainty of ± 3%.
The maximum system module voltage is 1500V. Refer to the following table for electrical performance
parameters.
4Installation
4.1 General safety
4.1.1 Sunerg Solar’s modules have been evaluated by according to IEC61215 and IEC61730, application class
A, modules rated for use in this application class may be used in system operating at greater than 50V DC or
240W. The safety class of the module is Class II, the class of fire rating is Class C（According to the standard
is UL790）, and the maximum series fuse is 20A.
4.1.2 The installer should abide by the relevant local laws and regulations when installing module. It is need to
obtain the required certificates in advance when necessary, such as the building permit.
4.1.3 Installing solar photovoltaic systems require specialized skills and knowledge. Installation should be
performed only by qualified person. Installers should assume the risk of all injuries that might occur during
installation, such as electric shock.
4.1.4 Photovoltaic modules are designed for outdoor use. Modules may be mounted on ground, rooftops,
vehicles or boats. Proper design of support structures is the responsibility of the system designers or installers.
When modules are mounted on rooftops, fire-protection rating of the final structure should be considered, and
also the later maintenance. The rooftops and support structure for PV system should only be certified by
architectural experts or engineer, which have a formal complete structure analysis results.
4.1.5 For your safety, do not install the modules without safety precautions.
4.1.6 For your safety, do not install or handle the modules under wet or adverse environment, including but not
limited to strong wind, gusty wind, frosted roof surfaces, wet environment.
4.2 Electrical properties safety
4.2.1 When a module is exposed to sunlight or other light sources, a direct current is present inside the module,
and electrical contact with the module may result in an electrical shock hazard.
4.2.2 In order to avoid arc and electric shock, please do not disconnect electrical connections under load. Keep
all electrical connectors dry and clean, and ensure that they are in proper working condition. Do not insert
other metal objects into the connector, or in any other way.
4.2.3 Do not apply paint or adhesive to module surface. Do not wipe modules with corrosive chemicals.
4.2.4 Do not use mirrors or other magnifiers to focus sunlight on the modules. Do not expose the backside of

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modules directly to sunlight for a long time.
4.2.5 Do not change the configuration of the bypass diodes. Do not disassemble the modules.
4.2.6 Do not contact with module surface when the module is wet unless to clean the modules, please
following requirements mentioned in this manual when cleaning.
4.3 Handling safety
4.3.1 Do not open the box until it reaches the installation location. Keep the package in a ventilated and dry
place.
4.3.2 PV modules Unpacking Please refer to Unpacking manual of standard package of Sunerg Solar
photovoltaic modules. During all handling procedures, make sure that the modules are not subject to large
vibrations, that the modules fall to the floor or that objects fall on the module, as this will Damage to the
modules or solar cell. Special care must be taken not to bump, scrape, or press against the back of the module.
Keep children and unauthorized person away from the modules while transporting or installing them. Improper
transportation or placing may lead to glass breakage or power loss of the modules, resulting in the loss of the
use value of modules.
4.3.3 Handle modules with care, lift and put down modules gently. It is forbidden to carry or lift the modules
by grabbing the junction box or cables. Two or more people must hold the module with both hands.
4.3.4 Do not step on, stand or sit on the module, which can damage the module and create a risk to people.
4.3.5 Do not place any heavy objects on the front or back of the module, and do not place the module on a
sharp object surface.
4.4 Installation safety
4.4.1 Abide by the safety regulations for all other modules used in the PV system, including wiring and cables,
connectors, controllers, inverters, storage batteries, etc., and use suitable equipment, connectors, wiring and
mounting system for a PV system. If the PV system is used in storage batteries, the configuration with the
modules should follow the advice of the storage batteries manufacturer. The same size, the same specifications
of the model can be connected in series.
4.4.2 Do not install or handle the modules when they are wet or during strong wind. Keep the junction box’s
cover closed.
4.4.3 Modules of the glass with the role of protection modules, unreasonable operation will cause glass broken.
Damaged modules have the risk of electric shock and fire, such modules can not be repaired or maintained,
should be replaced immediately.
4.4.4 When exposed to direct sunlight, one individual solar module may generate DC voltages greater than 30
volts. It is extremely dangerous to contact it.
4.4.5 To reduce the risk of electric shock or burning, you can install modules with opaque material on the
surface of the module. The mounting of the array of modules must be carried out with an isolating solar
installation. Do not wear metal rings, watches, earrings and other metal accessories when installing or
servicing PV systems. Do not touch the electrical parts of the module directly by hand. Use an insulating tool
to make electrical connections and keep the tool dry.
4.4.6The triangle hole punched on the backside frame of the module is the drainage hole which cannot be
blocked.
4.4.7 The maximum system voltage indicated in the rating label is 1500 V. During the system Installation, the
maximum open circuit voltage in series cannot exceed the maximum system voltage.

4.4.8 During modules interconnection, ensure to fix the connecting cables to supporting bracket, so as to
restrict the swing amplitude of the slack part of the cables.
4.4.9 Abide by the allowable minimum bending radius of the cables (suggest no less than 43mm).
4.4.10 Always protect the cable with conduit where animals or children can touch it.
4.4.11 Please use the connector which is specially designed for photovoltaic system, and assemble it with the
tools recommended or specified by the manufacturer. In case that the connector applicable to the solar
photovoltaic system is required, please contact the local supplier. Ban different connectors to plug each other.
4.4.12 Make sure that the polarity is correct when connecting the module with inverter, storage battery or
combiner box to avoid the damage of bypass diodes in the modules due to incorrect polarity.
4.4.13 Do not drill holes in the frame, this may reduce the mechanical load ability and cause corrosion of the
frame.
4.4.14 Do not scratch the anodized coating of the frame (except for grounding connection), this may cause
corrosion of the frame or reduce the mechanical load ability.
4.4.15 Modules can't be used to replace the roof and wall materials, partial replacement is not allowed.
4.4.16 Any part (including nameplate) of modules supplied by Sunerg Solar can't be dismantled without
permission.
5 Installation condition
5.1 Working environment
Sunerg Solar’s PV module should operate in the following environmental conditions:
5.1.1Ambient temperature: -20℃ to +45℃
5.1.2 Operating temperature of the module: -40℃ to +85℃
5.1.3 Humidity: 85%RH
5.1.4 Mechanical load bearing capacity: the modules have passed the mechanical load test of wind pressure of
1200Pa and snow pressure of 5400pa; at the same time, they have passed the mechanical load test of wind
pressure of 2400Pa and snow pressure of 3600Pa. (Only limited to the PV module models mentioned in this
manual).
Note: The module mechanical load is based on the installation method and installation site, in the calculation
of mechanical load by the professional installer according to the system design requirements to calculate.
5.2 Installation position
5.2.1 In most applications, PV modules should be installed in a location where they will receive maximum
sunlight throughout the year. In the northern hemisphere, modules should typically face south, and in the
southern hemisphere, modules should typically face north.
5.2.2 The module shall be installed in the place where the sunshine is adequate. the module surface shall not be
partly shaded by trees, building, clothes, tools, packaging materials, etc. because these objects will form
shadow in the module surface leading to loss of system output power.
5.2.3 The module shall be installed in the well-ventilated place; meanwhile, enough space for airiness shall be
sated at the back and sides of the module, so that the heat generated during operation can be radiated in time.
5.2.4 Modules can not be used in other excessive and harsh environments, such as hail, snow, sand, smoke, air
pollution, soot, flammable gases, near open flames, and highly corrosive substances (salt, salt spray, salt water,
acid rain) , As this will affect the module's safety and performance. If the installation environment is special,

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such as the seaside, farm, high humidity or wind and other large environment, please consult your local dealer
for professional support and confirmation. If you need to be installed at a high altitude, the altitude should not
exceed 2000m.
5.2.5 PV modules have passed IEC61701 salt-mist, but galvanic corrosion can occur between the aluminum
frame of the modules and mounting or grounding hardware is comprised of dissimilar metals. Modules can be
installed at seaside locations 50m to 500m from the sea, but the components should be protected against
corrosion. For locations ≥500m from the sea, it is low risk with salt-mist corrosion, only annual preventive
maintenance is required.
5.2.6 Modules should be installed in suitable building, or other suitable place to install modules (such as the
ground, garage, building facades, roof).
5.2.7 If modules are installed in locations with frequent lightning activity, the modules must be protected
against lightning strikes.
5.2.8 Do not install the modules in this location with water immersion or near the sprinkler.
5.2.9 The pressure of the wind or snow after installation of the modules must not exceed the maximum
allowable load.
5.3 Tilt angle selection
5.3.1 The tilt angle of the Modules is measured between the surface of the modules and a horizontal ground
surface, the modules generates maximum power output when it faces the sun directly, as shown in figure 2.
5.3.2 Modules each element in series with the same array must be oriented in the same direction and angle.
Different installation directions and angles will cause the modules to absorb the total solar radiation difference,
causing the loss of output power, thus reducing the operating efficiency of the system.
5.3.3 The maximum power is generated when the sun is directed to the module, select the best installation
angle should be considered when the winter module power output. But external or otherwise artificially
concentrated sunlight shall not be directed onto the front or back face of the PV module.
5.3.4 In order to facilitate the cleaning modules and modules in the rain when the surface dust is easily washed
away by rain. For detailed installation angles, follow the advice given by the experienced PV module installer.
Figure 2 Module tilt angle
6Mechanical installation
All of the installation methods described here are for reference only. Sunerg Solar is not responsible for
providing the relevant installation parts and module installation services.
6.1 Conventional requirement
6.1.1 Ensure that the installed modules and supporting rail of modules are strong enough, the entire PV system
consisting of modules must be able to withstand anticipated mechanical pressure. The installer must provide

the guarantee. The installation supporting rail must be tested by the third-party organization with the analysis
ability of Static Mechanical according to the local national or international standards.
6.1.2 The supporting rail must be made of environmental corrosion, anti-rust and UV-resistant materials.
6.1.3 Modules must be securely fastened to the supporting rail.
6.1.4 Drilling holes on the surface of module glass or drilling additional mounting holes on module frames
may void the warranty.
6.1.5 Forces generated during thermal expansion and contraction of the supporting rail may influence the
performance and use of the module, so make ensure that the minimum distance between two neighboring
frames is 10mm, but in order to ensure good ventilation. Suggest this distance between two neighboring
frames is 30mm.
6.1.6 In areas with large snow cover in winter, select a higher mounting bracket so that the lowest point of the
module will not be covered by snow for long periods of time. In addition, the lowest point of the module is
high enough to prevent the module from being obstructed by vegetation or trees.
6.1.7 The bearing surface of the supporting system must be smooth without any twist or deformation, and all
of them shall be at the same height without dislocation.
6.1.8 The module mounting method does not result in electrochemical corrosion between the aluminum frame
of the module and the different metals.
6.2 Three kinds of Mounting
6.2.1 Roof mounting
6.2.1.1 It is necessary to provide a special supporting rail for the roof mounting. When installing a module on a
roof or building, ensure that it is securely fastened and cannot fall or be damaged as a result of strong winds or
heavy snow. During roof mounting, check the building codes being used to ensure that the building and its
structure where the module is installed have adequate bearing and sealing capacity. The roof when penetrated
during module installation shall be properly sealed to avoid rainwater leakage.
6.2.1.2 To be suitable for operation, reduce steam condensation and facilitate the ventilation & heat dissipation
of the module during tile installation, the module shall be parallel to the wall or roof surface of the building,
and the distance between module and surface of the wall or roof shall be at least 50mm to prevent wiring
damage and to allow air circulation, ventilation and heat dissipation behind the module. For stacking type
installation, the module shall be installed on the fire-resistant roof. The Fire Resistance Rated Class of the
modules is Class C, and the modules are suitable for mounting on an above Class A roof. Do not install
modules on a roof or building during strong wind.
6.2.1.3 For the roof system installed in the area with relatively heavy snowfall or snow cover in the
meteorological records, the installer shall reinforce the supporting system at the lower frame of the module, in
order to prevent the lower frame from being pressed and damaged by the falling snow or freezing of the melt
ed snow. Sunerg Solar suggests selecting the support reinforcing mechanism shown in figure 3.
The clamp
The upper module
The support rail
The under module
The strength support

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Figure 3 Schematic diagram of reinforcement mounting of module
6.2.2 Pole mounting
When installing a module on a pole, choose a pole and supporting rail that will withstand the anticipated
wind power of the local area. The pole must be constructed on a solid foundation.
6.2.3 Ground mounting
Select the height of the mounting system to prevent the lowest edge of the module from being covered by
snow for a long time in winter in areas with heavy snowfalls. The module shall be installed on the supporting
rail with appropriate height instead of being directly laid on the ground. In addition, the lowest portion of the
module shall be high enough (≥900 mm) from ground, so that it is not shaded by plants and trees, or damaged
by sand and stone driven by wind, or not shaded by the mud splashed by rain water.
6.3 Installation methods
6.3.1 General rules
a) Modules can be fastened on the supporting system using screw bolts or clamps. Modules must be
installed according to the following methods or instructions. If not the warranty may be void.
b) Sunerg modules have reached the IEC standard on the mechanical load requirements. When
mounting, fasten the screws through the 4 or 6 symmetrical mounting holes on the inside of the
aluminum bezel or use the pressure clamp to secure the module to the supporting rail, Sunerg
module can withstand the wind pressure of 2400Pa and the snow pressure of 5400Pa (Only the
module models covered in this manual are available）, it is recommended that the system designer or
installer perform the load calculations.
c) The supporting rail and other materials required (such as screw) shall be made of durable, resistance
to environmental corrosion, anti-rust and UV-resistant materials.
6.3.2 Screw installation
6.3.2.1 Use anti-corrosion M8 bolts to fix through the mounting holes on the module frame. Each module
needs to be fixed on 4 or 8 mounting holes, as shown in Table 1 Schematic diagram of mounting holes for
fixed modules. If you need to strengthen the installation, it is recommended to use the 6.3.3 fixture installation
method.
6.3.2.2 When fixing with M8 bolts, spring washers and flat washers must be added to 4 or 8 symmetrical
mounting holes. See Table 1 for bolt fixing diagrams. The recommended torque for tightening screws is
from12N.m to16N·m . The recommended accessories are shown in Table1:
Table 1 Bolt fixing assembly
Schematic diagram of mounting hole for fixed
modules
Screw bolts fasten method
Recommend accessories
Module
M8 Screw
Flat washer
Spring washer
M8 Nut
The Support
rail
Part name
material
Dimension
Screw
Stainless steel
M8×
16mm

Spring
washer
Stainless steel
M8
Flat washer
Stainless steel
M8
Nut
Stainless steel
M8
6.3.3 Fixture installation
6.3.3.1 Use a certain number of clamps to fix the modules on the mounting bracket. Sunerg recommends that
the clamps be clamped on the long frame of the module. The area of the A side of the module frame held by
each fixed clamp is not less than 400mm2 (clamp length: ≥50mm, The width of the contact between the
fixture and the A surface of the frame: 9～11mm).
6.3.3.2 When installing the fixing jig, do not touch the front glass, and do not scratch or deform the aluminum
frame during installation. At the same time, the jig cannot affect the normal operation of the module. Make
sure that the drain hole and ground hole are not blocked during installation.
6.3.3.3 Each module needs to be fixed with at least four fixtures, and each long frame is equipped with at least
two fixtures. According to the local application conditions (actual conditions of wind and snow), additional
fixtures may be required to ensure modules and systems are subjected to corresponding loads. Fixtures with
the following conditions are recommended (as shown in Figure 4) or approved by the module system installer.
The support rail
Clamp B
Clamp A

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Fixture A: Fixture for edge module Fixture B: Fixture for intermediate modules
For the 30 frame, the recommended value of X is 29mm For the 30 frame, the recommended value of Y is 20mm
For the 35 frame, the recommended value of X is 34mm For the 35 frame, the recommended value of Y is 25mm
For the 40 frame, the recommended value of X is 39mm For the 40 frame, the recommended value of Y is 30mm
Figure 4 Assembly fixture installation method
6.3.3.4 When clamping the fixture to the frame of the module, use spring washers, flat washers and bolts to fix
the module on the mounting frame. Note that both ends should be clamped in a symmetrical position in the
center. M8 bolts and matching The screw is fixed, and the torque of the screw is from 18N·m.
6.3.3.5 If there is large snowfall or snow pressure in the module installation area and large wind pressure, it is
recommended that the customer adopt a 5400Pa reinforced installation solution to clamp the fixed module (as
shown in Table 2 recommendations) to increase the front of the module Resistant to static snow pressure and
dynamic wind pressure on the back, improving the system's pressure resistance.
Table 2 The clamping range of the fixture
Note:
A: Length of this type of module.
B: Width of this type of module.
C: The distance of clamp center1 from the short edge of this type of
module.
D: The distance of clamp center 2 from the short edge of this type of
module.
E: Clamped width of the module frame by the clamp of this type of
module.
F: Clamped length of the module frame by the clamp
of this type of module.
G:The distance of clamp center3 from the long edge of this type of
module.
* Note: Sunerg limited warranty will be void in cases where improper clamps or installation methods deviating from this manual are
used. When using clamps to fasten the modules, pay attention to the following requirements:

(a) Take care of the module frames, not to twist or deform them.
(b) Avoid the clamps’ shading influence the module.
(c) Not to damage the surface of module frame.
(d) Make sure that the module's drainage holes not be plugged.
Module Type
Installation
method
mechanical load /Pa
A/mm
B/mm
C/mm
D/mm
E/mm
F/mm
XMCH66400B
W+TW
Long side
Installation
positive5400、negtive2400
1646
1140
330±50
/
9～11
≥50
6.3.3.6 For matters concerning clamp or installation not mentioned in this manual, contact the local dealer for
professional support.
6.4 Wiring method
6.4.1Wiring method of horizontal modules
Horizontal Installation
（Double row ，The
junction box is inside）
The wire length of 72 / 78 is not less than 1200mm, and that of 60 / 66 is not less than
1000mm.
Horizontal Installation
（Double row ，The
junction box is on the
outside）
The wire length of 72 / 78 is not less than 1200mm, and that of 60 / 66 is not less than
1000mm.
Horizontal Installation
（Single row）
The wire length of 72 / 78 is not less than 1200mm, and that of 60 / 66 is not less than

12
1000mm.
Vertical Installation
（Double row）
The wire length of 72 / 78 is not less than 700mm, and each string needs to add a
jumper wire not less than 900mm. The wire length of 60 / 66 is not less than 700mm,
and each string needs to add a jumper wire not less than 500mm.
Vertical Installation
（Single row）
The wire length of 72 / 78 is not less than 700mm, and that of 60 / 66 is not less than
700mm.
6.4.2Wiring method of vertical modules

Head to tail connection
The wire length of this connection mode is not less than 800mm. During
installation, attention should be paid to the positive and negative pole positions of
the modules, and the next module need to be turned around .
The wire length of this connection mode is not less than 1400mm.
In this connection mode, the wire length is the shortest, the wire length is required
to be 300 mm, and each string needs to add a 1000 mm jumper wire.
7Electrical installation
7.1 Electrical property
7.1.1 Under normal conditions, a photovoltaic module is likely to experience conditions that produce more

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current and voltage than reported at standard test conditions. Accordingly, the values of ISC and VOC marked
on this module should be multiplied by a factor of 1.25 when determining module voltage ratings, conductor
current ratings, fuse sizes, and size of controls connected to the PV output.
7.1.2 Try to use the modules with the same configuration in the same PV system. If the modules are connected
in series, the total voltage is the sum of voltages of all the modules. The maximum voltage of string does not
exceed the maximum system voltage of the modules (the maximum system voltage of Sunerg Solar modules is
1500V), the maximum number of modules that can be connected in a series string must be calculated in
accordance with applicable regulations, make sure the open circuit voltage of string does not exceed the
maximum system voltage of the modules and the other electrical DC modules required at the minimum
temperature at the PV system location. Using the following formula:
System voltage=N*Voc*[1＋λvoc (Tmin - 25℃)]
N——number of modules in series
Voc——open circuit voltage at STC (refer to product label or data sheet)
λvoc——Thermal coefficient of Voc of each module (refer to product data sheet)
Tmin——minimum ambient temperature at the PV system location
7.1.3 If the PV system requires the installation of high current, several PV modules can be connected in
parallel, and total current is the sum of current of all the modules. The maximum parallel number of the
modules N= Imax (fuse rating) /Isc.
7.1.4 An over-current protection device with appropriately rated must be used when reverse current could
exceed the value of the maximum fuse rating of the module, an over-current protection devices is required for
each series string if more than two series strings are connected in parallel.
7.1.5 When installing the module, place the end with the junction box up and try to avoid the rain.
7.1.6 Do not carry out installation in rainy weather, because humidity will void the insulation protection, Thus
cause safety accidents.
7.2 Cables and wiring
7.2.1 Use a junction box with a degree of protection IP67 or above. The junction box has a connected cable
and connector. Each module has two single-conductor wires, one positive and one negative, which are
pre-wired inside the junction box. Installers can connect two modules by firmly inserting the positive
connector of a module into the negative connector of the other module. Refer to the following table for details
of junction box.
7.2.2 Never perform pretreatment to modules including connector, junction box and cable with lubricating oil
or cleaning agent made of alkanet materials during installation.
7.2.3 The cross section area of the cable and connector capacity selected must satisfy the maximum
short-circuit current of the system (It is recommended that the cross section area of the cable used for the
single module is 4mm2, Please note that the temperature limit range of the cable is -40℃～+90℃).
7.2.4 When fastening the cables to the supporting rail, pay attention to avoid mechanical damage to the cables
or modules, and also making a special design to protect the cables from environmental corrosion and direct
sunshine, for example, put the cable into the supporting beam or special pipes with UV-resistant materials. The
cables designed are sunlight resistant and waterproof, but also to avoid direct sunlight exposure and water
immersion of the cables.
7.3 Connectors

7.3.1 When connecting modules, make sure that the connectors of the same series module shall come from the
same manufacturer or totally be compatible with each others, and the same requirements shall go to the
connection terminals of series string and PV system, because the connectors from different manufacturers may
not be compatible with each others, which easily leads to mismatch risk.
7.3.2 Ensure that connector caps are tightened before connecting the modules, keep connectors dry and clean.
Do not attempt to make an electrical connection when the connectors are wet, soiled, or otherwise faulty
conditions. Avoid sunlight exposure and water immersion of the connectors.
7.4 Bypass diodes
The junction box of the Sunerg module contains bypass diode and forms a parallel structure with the solar
cell circuit. When the solar cell sheet is blocked or damaged, a hot spot phenomenon occurs locally in the
module, and the diode will operate so that the current is no longer discharged from the hot spot solar cell flow,
thereby limiting module heat and performance loss. Please note that bypass diodes are not overcurrent
protection devices.
7.5 Grounding
7.5.1 Modules use anodized aluminum alloy frame as a rigid support, in order to avoid modules by lightning
and electrostatic damage, as well as the protection of personal safety, all module frames and mounting racks
must be grounded. If there is no special provision, please follow the International Electrotechnical
Commission standards or other international standards. Use the recommended connection terminals to connect
the grounding cable to the module frame. Use 12 AWG copper wire for the grounding wire. As shown in
Figure 5 on the module ground hole and its label, Figure 6 shows the module grounding method.
Aluminumframe
Groundinghole
Grounding label
Figure 5 Grounding hole and ground label Figure 6 Grounding method
7.5.2 The frames have pre-drilled grounding holes and brand with signs, these holes should be only used for
grounding purposes, but not for mounting the modules. And do not drill any additional grounding holes on the
frames of the module, which may void the warranty.
7.5.3 For optimum power output, it is recommended to ground the DC negative pole of the module array.
7.5.4 The grounding cables must be fully contact with inside of the aluminum alloy, and the connection
terminal must penetrate the oxidation coating of frame during grounding. Connecting the module frames and
supporting beams using suitable grounding conductors can achieve good grounding. If the supporting system is
made of metal, the surface must be electroplated and have excellent conductivity.
7.5.5 The grounding cables must be connected to the earth through a suitable grounding electrode.
Recommend to use the grounding accessories (lugs) to connect the cables. Welding grounding cable to the jack
of lugs, then inserting M4 screws into the ring of the lugs and the grounding holes of module frames, fastening
M4 Nut
Grounding cable
Aluminum frame
Tooth washer
Flat washer
Cup washer
M4 Screw

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with M4 nuts. Spring washers should be used to prevent the screws from loosening and lead to poor
grounding.
7.5.6 If the module is used in high-temperature and high-humidity environment, Sunerg Solar suggest the
customer configure the inverter which allows negative grounding and contains isolation transformer (as shown
in figure 7).
Figure 7 Schematic diagram for grounding potential of the inverter
7.5.7 Sunerg modules may be grounded using a third-party earthing device, provided that the earthing must be
reliable. The earthing device is operated in accordance with the manufacturer's requirements.
8Maintenance and care
Modules need to be inspected and maintained regularly, especially during the warranty period. To ensure
optimum performance of the modules, the following maintenance measures are recommended.
8.1 Cleaning
When modules are working, there should not be environmental influence factors to cover shadows in the
modules, such as other modules, supporting rail, plants, large number of dust etc., which may directly reduce
the power output and may even cause regional hot–spot effect. Therefore clean the glass surface on a regular
basis, clean modules take measures so as:
a) The frequency of the cleaning module depends on the rate of dirt buildup. Under normal conditions,
the rain will clean the surface of the module, but it is still need to regularly use a soft sponge or cloth
(dry or wet) cleaning modules. Any situation cannot use of rough surface materials to clean modules,
no use of acid and alkali cleaner to remove dirt.
b) Avoid pressing part of the module hard during cleaning, which may cause glass deformation, cell
damage and reduction of the module’s life.
c) Remove the snow covered on the module in time to avoid the module damage caused by long-term
accumulation of snow cover and freezing of melted snow.
d) When cleaning the negative of the module needs to avoid piercing negative-sheet.
e) It is recommended that modules be cleaned in the early morning or late afternoon when light is low
and the module temperature is low, especially for areas with high temperatures.
f) Do not attempt to clean modules that are damaged by glass or have exposed electrical wiring, which
may be subject to an electric shock hazard.
8.2 Visual inspection
+1500
+750
+0
With negative Grounding
Voltoge of string to ground/V

Please carefully check the modules of the existence of visual defects, focusing on the following items:
a) Check whether the module glass is broken.
b) Check if the front of the module is obstructed by obstacles or foreign objects.
c) Check the module negative-sheet whether there is hot, negative film raised, burn through the traces
and so on.
d) Check whether the cell bus–bar is corroded, whether encapsulation materials of the module has
delamination, bubbles, etc.
e) Check the tightness of the bolts and the electrical connections at the connection points between the
modules and the supporting rail.
8.3 Inspection of connector and cable
It is advisable to carry out a preventive check every 6 months and check the following:
a) Check Junction box adhesive for cracks or cracks.
b) Check the connector interface sealing and whether there is loose, melt deformation, aging or corrode.
c) Check that the cable connections are secure and that the modules are properly grounded.
When module is found to be defective, consult a qualified service technician. If servicing is required, it
should be serviced by a qualified service technician. Module exposure generates high voltages in the sun, so
cover the modules with opaque material when servicing modules to prevent electrical shock.
Note:
1. if found in the maintenance of any problems, feed negative to the professional service personnel for confirmation;
2. If using maintenance and repair measures not included in this manual, consult your local dealer for professional support.
9Disclaimer of liability
9.1 Because the use of the manual and the conditions or methods of installation, operation, use and
maintenance of photovoltaic (PV) product are beyond Sunerg’s control, Sunerg does not accept responsibility
and expressly disclaims liability for loss, damage, or expense arising out of or in any way connected with such
installation, operation, use or maintenance.
9.2 Sunerg shall not be liable for damage to the product resulting from the installation or the design of the
power generation system.
9.3 No responsibility is assumed by Sunerg for any infringement of patents or other rights of third parties,
which may result from use of the PV product, No license is granted by implication or otherwise under any
patent or patent rights.
9.4 In the installation of modules, the customer is not in accordance with the requirements of the listed this
manual operation, Sunerg does not provide any warranty.
9.5 The information in this manual is based on Sunerg’s knowledge and experience and is believed to be
reliable, but such information including product specification (without limitations) and suggestions do not
constitute a warranty, expresses or implied.
9.6 Sunerg reserve the right to change the manual, module technical specification, nameplate or product
information sheets without prior notice.