URECO URE PV Modules Mono Split Black Frame Instruction Manual
- June 13, 2024
- URECO
Table of Contents
URE PV Modules Mono Split Black Frame
Instruction Manual
INTRODUCTION
Thanks for choosing high quality modules from United Renewable Energy Co.,
Ltd. (Hereinafter referred to as “URE”) This Installation Manual contains
essential information for the electrical and mechanical installation that you
must know before installing URE PV modules. This also contains safety
information you need to be familiar with. All the information described in
this manual are the intellectual property of URE and based on the technologies
and experiences that have been acquired and accumulated in the history of URE.
This document does not constitute a warranty, expressed or
implied. URE 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 the PV modules. No
responsibility is assumed by URE for any infringement of patents or other
rights of third parties that may result from use of PV module. URE reserves
the right to make changes to the product, specifications or installation
manual without prior notice.
RULES AND REGULATIONS
The mechanical and electrical installation of the module should obey local
regulations, including electrical law, construction law and electricity
connection requirements. These regulations are different in different
installation site, such as the installation on the building roof, different
installation environment of the power station. Requirements may also differ
with the system voltage, the use of AC Or DC. For the specific terms, please
contact local authority.
Before installing the PV module, contact appropriate authorities to determine
permit, installation and inspection requirements that should be followed.
Don’t throw away the Modules Waste. Please contact local related departments
or authorities.
GENERAL INFORMATION
3.1 COMPONENTS OF MOUDLE
The structure of module is shown in the figure below. Each module is pasted
with three kinds of labels to provide the following information:
Nameplate: product type, rated power, rated current, rated voltage, open
circuit voltage, short circuit current under testing conditions, certification
indicator, maximum system voltage, etc.
Current classification label: Rated working current.
Serial Number label: A unique serial number which is laminated inside the
module permanently which can be found in the front of the module. 
| 1 | Drain Hole | 7 | Glass |
|---|---|---|---|
| 2 | Grounding Hole | 2 8 | EVA |
| 3 | Mounting Hole | 9 | Solar Cell |
| 4 | Connector/Cable | 10 | Backset |
| 5 | Junction Box | 11 | EVA/POE |
| 6 | Frame |
3.2 GENERAL SAFETY
URE PV modules are designed in accordance with the international standard
IEC61215 and IEC61730. The solar modules have been qualified for application
class A(equivalent to safety class Ⅱ requirements) . Installing PV modules and
ground frames should be in accordance with applicable rules and regulations.
Only installer/service personnel should have access to the PV module
installation site. IN order to avoid a risk of injury or electrical shock, do
not allow anyone to approach the PV module if the person has little knowledge
on PV module or on the measures that should be taken when PV modules are
damaged.
In the case that the PV modules are non-integral type, the module is to be
mounted over a fire resistant roof. Follow all safety precautions of other
components used in the system. Do not clean the glass surface with chemicals.
Do not let water stay on the glass surface of PV modules for a long time. This
creates a risk of white efflorescence (glass disease) which may result in the
deterioration of energy generation. Do not install the PV module horizontally.
It may cause dirt or white efflorescence(glass disease) due to water. Do not
cover the water drain holes of the frame. There is a risk of frost damage when
the frame is filled with waterhen sliding snow load has to be considered, an
appropriate measure has to be taken so that PV module frames on lower edge of
PV modules will not be damaged. 3.3 ELECTRICAL SAFETY
The installation of PV modules requires a great degree of skill and should only be performed by a qualified licensed professional ,including licensed contractors and licensed electricians.
Please read this manual carefully before installing or using the modules. Please be aware that there is a serious risk of various types of injury occurring during the installation including the risk of electric shock.
All UREPV modules are equipped with a permanently attached junction terminal box that will accept variety of wiring applications or with especial cable assembly for ease of installation, and they do not requirespecial assembly. Contact with electrically active parts of a PV module such as terminals can result in burns, sparks and lethal shock whether the PV modules is connected or not.
PV modules produce electricity when the sunlight or other sources illuminate the module surface. When the modules are connected in series, voltage is cumulative. When the modules are connected in parallel, current is cumulative. As a result, a large-scale PV system can produce high voltage and current which could present an increased hazard and may cause serious injury or death.
Do not connect the PV modules directly to the loads since the variation of the output power depending on the solar irradiation causes damage for the connected load. Do not connect the PV modules directly to the loads since the variation of the output power depending on the solar irradiation causes damage for the connected load.
A defective PV module may generate power even if it is removed from the system. It may be dangerous to handle the PV module while exposed to sunlight. Place a defective PV module in a carton after PV cells are completely shaded.
Do not expose PV module to sunlight concentrated with mirrors, lenses or similar means. Do not shade portions of the PV module surface from the sunlight for a long time. The shaded cell may become hot (hot spot phenomenon) which results in solder joints peeling off.
In case of series connection, the maximum open circuit voltage must not be greater than the specified maximum system voltage. The voltage is proportional to the number of series. In case of parallel connection, please be sure to take proper measure (e.g. fuse for protection of module and cable from over current, and/or blocking diode for prevention of unbalanced strings voltage) to block the reverse current flow. The current may easily flow in a reverse direction.
3.4 INSTALLATION SAFETY
During transportation or storage, unless you reach the installation site, otherwise, do not open the package of the modules. Please protect the modules’ package. When loading or unloading the modules, please handle with care. Do not drop the packed pallet of modules down directly. Before open the modules’ package, store the modules in ventilated and dry place. When opening the modules’ package with knife, be careful not scratching the module. Do not lift the whole module by grabbing the terminal box or cable in any sense. Modules are heavy. Handle with care. Do not drop PV modules far above ground. Do not drop one module down on another module. Do not stand or step on the module. Do not pass by stepping on the module especially when installing, maintain and washing the modules. Do not hit or put excessive load on the glass or back sheet. Do not allow objects fall down on the module. Do not cause an excessive load on the surface of PV module or twist the frame. Do not scratch or hit at the back sheet. Do not hit on the terminal box or do not pull the cables. Please notice the ground condition when the module is placed horizontally with back sheet faced down.
Do not try to unpick the module, remove any parts or the nameplate of the module. Do not brush oil paint or any other adhesive on the surface of the module. Do not scratch the insulation coating of the frame (except for grounding connection) It may cause corrosion of the frame or compromise the framework strength. Do not drill holes in the frame. It may compromise the frame strength and cause corrosion of the frame. Do not repair glass, back sheet or other broken part of the module. Please install with dry tools in dry condition.
Do not operate when the module is wet, unless wear proper equipment against electrical shock. Do not grab the PV module at only one side, the frame may bend. Grab the PV module at two sides facing each other. Do not touch the PV module with bare hands. The frame of PV module has sharp edges and may cause injury.
Do not scratch the output cable or bend it with force. The insulation of output cable can break and may result in electricity leakage or shock. Do not try artificially to concentrate sunlight on the PV module. Never touch terminal box or the end of output cables with bare hands when the PV module is irradiated. Cover the surface of PV module with cloth or other suitable sufficiently opaque material to isolate the PV module from incident light and handle the wires with rubber-gloved hands to avoid electric shock. Always wear protective head gear, insulating gloves and safety shoes (with rubber soles). Do not touch the PV module unnecessarily during installation. The glass surface and the frames get hot. There is a risk of burn, or you may collapse because of electric shock.
Do not work under rain, snow or windy conditions. Do not touch the terminal box and the end of output cables the cable ends (connectors) with bare hands during installation or under sunlight, regardless of whether the PV module is connected to or disconnected from the system. Lug in the connector tight and ensure the wiring work. Do not unplug the connector if the system circuit is connected to a load. Do not stomp on the glass at work. There is a risk of injury or electric shock if glass is broken. Do not work alone (always work as a team of 2 or more people). When installing PV modules far above ground, wear a safety belt, do not drop any object (e.g., PV module or tools). Do not wear metallic jewelry which can cause electric shock during installation. Do not wear metallic jewelry which can cause electric shock during installation. Do not damage the back sheet of PV modules when fastening the PV modules to a support by bolts.
Do not damage the surrounding PV modules or mounting structure when replacing a PV module. Bind cables by the insulation locks. Drooping down of cables from the terminal box could possibly cause various problems such as animal biting, electricity leakage in puddle. Take proper measures for preventing the laminate (consisted of resin, cells, glass, back sheet, etc.) from dropping out of the frame in case the glass is broken. Cables shall be located so that they will not be exposed to direct sunlight after installation to prevent degradation of cables. When installing the module, make sure that the terminal box is on the higher side of the module for better waterproof.
3.5 FIRE SAFETY
Consult your local authority for guidelines and requirements for building or structural fire safety .URE modules have been listed as Class C according to IEC 61730-2 standard. For roof installations, modules should be mounted over a fire resistant covering suitable for this application, with adequate ventilation between the Modules backset and the mounting surface. IN order to maintain the fire class rating, the distance between the Modules frame surface and the roof surface shall be at least 115 mm. Roof constructions and installations may affect the fire safety of building. Improper installation may create hazards in the event of a fire. Please install the Modules with Professional Installers.
INSTALLATION CONDITION
4.1 SITE SELECTION AND WORK ENVIRONMENT
In most applications, the PV modules should be installed in a location where
there is no shading throughout the year. Please make sure that there are no
obstructions in the surroundings of the site of installation. URE recommend
that the PV modules should be installed in the place where the operating
temperature is from 20℃ to46℃.The operating temperature is the maximum and
minimum monthly average temperature of the installation site. The limit of
working temperatures from -40℃ to 85℃.
URE PV modules must be mounted on proper structure or any other place which is
suitable for module installation(such as ground, roof and façade). Make sure
flammable gases are not generated near the installation site. The PV modules
should not be installed in flooded areas. The junction box should be on the
higher side of the module when it is mounted. Lightning protection is
recommended for PV systems that are to be installed in locations with high
probability of lightning strikes. Take proper steps in order to maintain
reliability and safety, in case the PV modules are used in areas such as:
Heavy snow areas / Extremely cold areas / Strong wind areas / Installations
over, or near, water / Areas where installations are prone to salt water
damage / Small islands or desert areas. 
URE suggests that modules
should not be installed nor operated in areas where hail, snow, sand, dust,
air pollution, soot, etc., are excessive .Modules must not be sited in
locations where aggressive substances such as salt, salt mist ,salt-water,
chemically active vapors, acid rain, any other type of corrosive agent, could
affect the safely the safely and/or performance of the Modules. URE PV modules
have also passed salt mist corrosion test according to IEC60701. But corrosion
may occur in the module frame connecting to the bracket portion or the portion
of ground connection, those parts shall be prepared with anti-corrosion
treatment before usage.
URE recommends that modules used or installed should be 2000 meters (altitude)
at most.
4.2 TILT ANGLE
The tilt angle of the PV module is the angle between the PV module and a
horizontal ground surface.
The PV module generates the maximum output power when it faces the sun
directly. In the Northern Hemisphere, the PV modules should typically face
south, and in the Southern Hemisphere, the PV modules should typically face
north. For the detailed installation angle, which is different in different
area, may refer to the recommendation of the experienced PV modules
installation supplier. Modules mounted flat(0° tilt angle) is not suggested
due to dust is easy to be accumulated and affect power output. Dust building
up on the surface of the modules can impair with modules performance. URE
recommends installing the modules with a tilt angle of at least 9 degrees,
making it easier for dust to be washed off by rain and more regular cleaning
is not required and water on the surface of module will not be accumulated,
avoiding moldy glass caused to affect the degradation of the modules because
of long time water collection on the module surface.
MECHANICAL INSTALLATION
5.1 REGULAR REQUIREMENTS
Make sure that module installation mode and bracket system can meet the
expected load, which is requisite assurance that the bracket installer must
provide. Installation bracket system shall be tested and inspected by the
third party testing institution with static mechanical analysis capacity in
accordance with local national standards or international standards. Module
bracket shall be made from durable, corrosion resistant, UV-proof materials.
Modules shall be fixed on the bracket solidly. Use higher brackets in places
with heavy snow accumulation so the lowest point of modules will not be
shadowed by snow for a long time. In addition, make the lowest point of
modules high enough so as to avoid shading of vegetation and woods or reduce
damage of sands and stones.
If modules are installed on brackets parallel to the roof or wall, the minimum
gap between the module frame and the roof/wall shall be 10cm for air
ventilation in case of module wire damage. Make sure the building is suitable
for installation before installing modules on roof. Moreover, seal properly to
prevent leakage. The module frames can appear thermal expansion and cold
contraction so the frame interval between two adjoining modules shall be no
less than 10mm. Make sure that backset of modules will not be in contact with
bracket or building structures that can pierce into the inside of the modules,
especially when the module surface is imposed by pressure.
5.2 MOUNTING METHOD
Module and bracket system connection can be realized by mounting holes,
clamps or embedded systems.
Installation shall follow the demonstration and suggestions below. If
installation mode is different, please consult URE and obtain approval.
Otherwise, modules may be damaged and limited warranty will be invalid.
Modules have been certified for maximum static load on the back side of 2400Pa
(i.e. wind load) and a maximum static load on the front side of either 2400Pa
or 5400Pa（i.e. wind and snow load）, depending on the modules type (please
refer to the following installation methods for details)
5.2.1 BOLTS MOUNTING
Through the mounting hole on the back frame of the photovoltaic module, the
module can fixed on the support with bolts. One module generally has 4 or 8
mounting holes and is installed with M8 bolts. The details are shown in the
following figure： 
| 6 | Nut | M8X1.25 | S35C |
|---|---|---|---|
| 5 | Gasket | 16X1.7 | Fe |
| 4 | Mount | •5 | Q235 |
| 3 | Gasket | 16X1.7 | Fe |
| 2 | Spring gasket | 13.5X2.1 | Mn65 |
| 1 | Screw | M8X1.25 | S35C |
| NO. | NAME | Size | Material |
Installation position and corresponding load of modules：
| (Beam perpendicular to long sides) | (Beam Parallel to long sides) |
|---|---|
| Module Type | Mounting hole spacing |
| hole spacing | Load Capacities |
| M6 120cells | 1200*999 |
| M6 144cells | 1440*999 |
| 1440*1095 | +5400/-2400 |
| M10 144cells /BF-DG (1134*2278) | 1400*1095 |
| MIO 108cells | 1200*1095 |
+5400/-2400
14001095| +5400/-2400
M10 144cells| 14401095| +5400/-2400| G12 132cells /BF-DG| 14001264|
+5400/-2400
14001095| +5400/-2400
G12 120cells| 14001264| +5400/-2400| | |
G12 132cells| 1400 1264| +5400/-2400| | |
5.2.2 CLAMP MOUNTING
Under no circumstances should the clamp touch the glass or deform the frame.
The interface of the clamp to the front of the frame must be smooth and flat
to prevent frame or other components from being damaged. Make sure no
shadowing effect of the fixture. The drain hole cannot be blocked by the
fixture. For framed PV module the clamp must maintain an overlap of 8-11 mm
with the frame of the module (you can change the cross section of the clamp if
the module is securely installed). 
| Name| Size| Material
---|---|---|---
1| Bolt| M8| S35C
2| Nut| M8| S35C
3| Gasket| M8| S35C
Installation position and corresponding static loads：
| (Beam perpendicular to long sides) | (Beam Parallel to long sides) |
|---|---|
| M10 144cells | 395-445 |
| 012 120cells | 361-411 |
| G12 132cells | 467-517 |
| Module Type | S(mm) |
| Capacities(pa) | Module Type |
Capacities(pa)
M6 120cells| 252-302| +5400/-2400| M6 144cells/BF-DG| 302-352| +5400/-2400
M6 144cells| 302-352| +5400/-2400| M10 144cells/BF-DG| 397-447| +5400/-2400
M 10 108cells| 237-287| +5400/-2400| G12 120cells/BF-DG| 361-411| +5400/-2400
Installation of framed module with fixture on short sides
Beam perpendicular to long sides）
| Module Type | S(mm) | Load Capacities(pa) |
|---|---|---|
| M6 120cells | L/4（±25） | +1800/-1800 |
| M10 108cells | L/4（±25） | +1800/-1800 |
Bifacial module can generate power after receiving reflected light on the
back, which can bring additional power generation gain to the power station.
Therefore, for bifacial module, it is recommended to install the beam parallel
to long sides, so that there is no beam shielding directly below the module.
5.2.3 MOUNTING METHODS WITH SINGLE-AXIS TRACKER
The bolts and clamps used in this section should follow the requirements in
5.2.1 and 5.2.2. Install and tighten the module clamps to the mounting rails
using the torque stated by the mounting hardware manufacturer. M8 X 1 (1/4”)
bolt and nut are used for this bolting method. Tightening torques should be
1620 Nm coarse thread bolts, depending on bolt class. Different tracker
systems may have large deviations. Please provide the selected tracking
support supplier and product model and consult URE for details. Tracker 1P
Bolting/Clamping method：
Module type| Load Capacities（pa）| Module type| Load
Capacities (pa)
---|---|---|---
M6 144cells| 1600-2400| M6 144cells| 1600-2400
M6 144cells /BF-DG| 1600-2400| M6 144cells /BF-DG| 1600-2400
M10 144cells| 1600-2400| M10 144cells| 1600-2400
M 10 144cells /BF-DG| 1600-2400| M 10 144cells /BF-DG| 1600-2400
G12 120cells| 1600-2400| G12 120cells| 1600-2400
G12 132cells| 1600-2400| G12 132cells| 1600-2400
G12 120cells/BF-DG| 1600-2400| G12 120cells/BF-DG| 1600-2400
G12 132cells/BF-DG| 1600-2400| G12 132cells/BF-DG| 1600-2400
Tracker 2P Bolting method:
| Module type | Load Capacities（pa） |
|---|---|
| M6 144cells | 1200-2400 |
| M6 144cells/BF-DG | 1200-2400 |
| M10 144cells | 1200-2400 |
| M10 144cells/BF-DG | 1200-2400 |
| G12 120cells | 1200-2400 |
| G12 132cells | 1200-2400 |
| G12 120cells/BF-DG | 1200-2400 |
| G12 132cells/BF-DG | 1200-2400 |
ELECTRICAL INSTALLATION
6.1 WIRINGAND CABLES
To ensure proper system operation and to maintain your warranty, observe the
correct cable connection polarity (Figures 3&4) when connecting the modules to
a battery or to other modules. If not connected correctly, the bypass diode
could be destroyed.
PV modules can be wired in series to increase voltage. Connect wires from the
positive terminal of one module to the negative terminal of the next module.
Figure 3 shows modules connected in series. Connect PV modules in parallel to
increase current. Connect wires from the positive terminal of one module to
the positive terminal on the next module. Figure 4 shows modules connected.
Figure 4.PARALLEL for more current
These junction boxes have been designed to be easily interconnected in series
for their well-connected cable and connector with IP67 protection grade at
least. Each Modules has two single-conductor wires, one positive and one
negative, which are pre-wired inside the junction box the connectors at the
opposite end of these wires allow easy series connection of adjacent Modules
by firmly inserting the positive connector of a Module into the negative
connector of an adjacent Module until the connector is fully seated.
Use field wiring with suitable cross-sectional areas that are approved for use
at the maximum short-circuit current of the Modules. URE recommends installers
use only sunlight resistant cables qualified for direct current(DC)wiring in
PV systems. In general, the maximum number (N) of PV modules in series can be
calculated by dividing the maximum system voltage by the open circuit voltage
of the relevant solar PV modules. When designing the solar PV system, it is
necessary to take into account the characteristic that the voltage of the
solar PV module changes with the temperature. Considering the voltage increase
caused by temperature drop in extreme environment in winter, the maximum
series connection number of solar PV modules can be calculated by the
following formula.
Maximum system voltage V ≥ N x Voc x [1 + βx(Tmin − 25)] V:Maximum system
voltage;
N:The number of maximum solar PV modules in series;
Voc: The open circuit voltage of each module ;
β:Temperature coefficient of open circuit voltage of the module;
Tmin :The lowest ambient temperature at installation site;
Cables should be fixed to the mounting structure in such a way that mechanical
damage of the cable and/or the modules is avoided. While the cables are
sunlight resistant and waterproof, where possible, avoid direct sunlight
exposure and water immersion of the cables.
Maximum parallel strings without proper measures (e.g. fuse and/or blocking
diode): 1 string. Note: Parallel configuration is not limited in case of
taking proper measure (e.g. fuse for protection of module and cable from
overcurrent, and/or blocking diode for prevention of unbalanced strings
voltage) to block the reverse current flow.
The quantity of string connection for modules should be consulted by the
professional institute. Parallel connection for only 2 pcs modules is not
recommended. Type of terminal for field wiring is the same as the Module’s.
Rating required minimum field wiring
| Testing standard | Wire size | Temperature Rating |
|---|---|---|
| EN 50618:2014 | 4mm² | -40℃ to +90℃ |
6.2 CONNECTORS
Keep connectors dry and clean, and ensure that connector caps are hand tight
before connecting the Modules. Do not attempt to make an electrical connection
with wet, soiled, or otherwise faulty connectors.
Avoid sunlight exposure and water immersion of the connectors. Avoid allowing
connectors to rest on the ground. Faulty connections can result in arcs and
electrical shock. Check that all electrical connections are securely fastened.
Make sure that all locking connectors are fully engaged and locked. The
Suppliers and types of connectors should be in accordance with the Standard
ICE 62852.
6.3 BYPASS DIODES
The junction boxes used with URE modules contain bypass diodes wired in
parallel with the PV cell strings.
In the case of partial shading, the diodes bypass the current generated by the
non-shaded cells, thereby limiting modules heating and performance losses.
Bypass diodes are not over-current protection devices.
The type and rating of bypass diode to be used must pass the tests (IEC
62790:2014) of the Junction Box. For more details, please see the CDF related
Junction Box. In the event of a known or suspected diode failure, installers
or maintenance providers should contact JA Solar. Never attempt to open the
junction box by yourself.
6.4 ELECTRICAL RATINGS
Under normal conditions, a photovoltaic module is likely to experience
conditions that produce more current and/or 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 component voltage
ratings, conductor capacities, fuse sizes and size of controls connected to
the module output.
GROUNDING
The frame grounding is considered within the requirement of local regulation
at the site of installation.
When needed this grounding, please refer to below example of connection.
Please be careful in arranging the system ground so that the removal of one
module from the circuit will not interrupt the grounding of any other modules.
The modules should be grounded to the same electrical point. Each PV module
has grounding holes. Do not drill additional grounding holes on the frame. And
the negative pole of the module must be grounded. Otherwise, the module
warranty may be void.
An example of acceptable ground connection using a screw, nut（ hardware not
provided） and washer retaining a ground screw is shown in figure 5. The size
of the grounding cable should be decided by the professional person who
responsible for electrical installation. In a connection of this type, the
hardware (such as a toothed locked washer / star washer) must score the frame
surface to make positive electrical Contact with the frame. The ground wire
must be considered within the requirement of local and regulation at the site
of installation. If steel parts used for grounding purpose, steel parts must
be plated, painted or enameled for protection against corrosion before usage.
OPERATION AND MAINTENANCE
8.1 MODULE APPEARANCE INSPECTION
Check module cosmetic defects with naked eyes, especially:
- Module glass cracks;
- Corrosion at welding parts of the cell main grid;
- Check whether the modules are covered by things;
- Check if any loose or damage screws between the modules and mounting system;
- Check whether there are traces of burning mark on the module back sheet.
8.2 CLEANING
Accumulated contaminants on module surface glass will reduce the power output
and lead to local hot spot, such as dust, industrial wasted water and birds’
droppings. The severity of Influence is determined by transparency of wastes.
Small amounts of dust will affect the intensity and evenness of received solar
irradiation but are not dangerous and power will not be reduced remarkably
generally. During operation of modules, there shall be no environmental
factors to shade modules fully or partially. These environment factors
including other modules, module mounting system, birds dwelling, dust, soil or
plants. These will significantly reduce output power. URE suggests that the
module surface should not be shadowed in any case. Frequency of cleaning
depends on dirt accumulation speed. In normal situations, rainwater will clean
the module surface and reduce the cleaning frequency.
It is suggested to use sponge dipped with clean water or soft cloth to wipe
the glass surface. Do not use acid and alkaline detergents to clean modules.
Do not use tool with rough surface to clean in any case. When the pressure
water is used, the water pressure on the glass surface of the module must not
exceed 700 KPa. The module must not be subjected to additional external force.
If necessary, use isopropyl alcohol (IPA) according to the safety instructions
to clean and ensure that no IPA flows into the gap between the edge of the
module and the module frame.
In order to avoid potential risk of electrical shock or burn, URE suggests
cleaning the modules during
Early morning and evening with low irradiance and low modules temperature
especially area with high average temperature.
It is forbidden to clean photovoltaic modules under weather conditions with
heavy rain, heavy snow or winds greater than class 4.
The back surface of the module normally does not need to be cleaned, but in
the event this is deemed necessary, avoid the use of any sharp objects that
might damage or penetrating the substrate material.
Water requirements when cleaning:
- PH: 5～7;
- Chloride or salt content: 0 – 3,000 mg/L;
- Turbidity: 0-30 NTU;
- Conductivity: 1500～3000 μs/cm;
- Total dissolved solids: ≤1000 mg/L;
- Water hardness: 0-40 mg/L;
- Non-alkaline water must be used, and softened water can be used when conditions permitted.
8.3 INSPECTION OF CONNECTORS AND CABLES
It is suggested to carry out the following preventive inspection twice a year.
Check if any crack or gap of silicone nearby the junction box. In order to
ensure the operation safety of the power station and modules, the cables and
connectors in the modules need to be fixed accordingly to prevent the harm
caused by the continuous impact on the modules in the strong wind environment.
Check whether the sealant at the junction box is cracked and has gaps.