Renew RPS1MH66BD Series User manual

SOLAR PV MODULE
Installation Manual
BIFACIAL MODULE
RPS1MH66BDXXX RPS1MH60BDXXX RPS2MH72BDXXX
R P S1MH66MBXXXRPS1MH60MBXXXRPS2MH72MBXXX
MONOFACIAL MODULE

Table of contents
1. Overview
2. Laws and Regulations
3. General Information
a. Module Identification
b. Wiring methodology
c. Electrical Performance Safety
d. Operation Safety
e. Fire Safety
4. Installation Conditions
a. Installation safety
b. Climatic condition
c. Site and tilt angle selection
5. Mechanical Installation
a. Regular Requirements
b. Bolt Mountings
6. Electrical installation
a. Electrical Performance
b. Cables and Wiring
c. Connector
d. Bypass diode
7. Grounding
8. Operation and maintenance
a. Cleaning
b. Cleaning precautions
c. Module Appearance Inspection
9. Product Electrical Parameters
10. Disclaimer of liability
Solar PV ModuleInstallation Manual |Page 1

1. Overview
2. Laws and Regulations
3. General Information
3.1. Module Identification
There are 3 labels on the modules which contain the following information.
o
Product model / type
Module electrical data (Power,V
oc
, I
sc
, I
mpp
, V
mpp
, Eciency)
Certification logo and certification number
Maximum overload protection current
Maximum system voltage
Manufacturing address
Safety sign
o
o
o
o
o
o
o
High
Low
o
o
There is unique serial number, one will be inside the laminates and other
two will be pasted on the substrate and frame.
Back label or rating label
Current binning label/ Rated working label
Module Serial Number
Installation of photovoltaic modules i.e. electrical and mechanical shall be in accordance with
applicable regulations, including electrical law, construction law and electrical connection
requirements. These regulations vary from site to site: building roof installation, vehicle
applications, etc. Requirements may also vary depending on the installed system voltage, DC or
AC. Please contact local authorities for specific terms.
External or otherwise artificially concentrated sunlight shall not be directed onto the front or back
face of the PV module.
Thank you for choosing ReNew PV modules. This manual briefly elaborates on the installation and
safety use information for our modules. Since solar PV modules generate electricity when exposed
to light, there are certain safety precautions that need to be regulated.
Please follow the instructions carefully before installing and making use of the modules.
Solar PV ModuleInstallation Manual |Page 2

3.2. Wiring Methodology
Orientation Recommended wiring connection
Portrait (1P)
An extension cord is required at the last module
Portrait (2P)
Figure 1 : Module (with frame)
In case where a cable connection method is not included in the below table confirm the suitable
cable length with any ReNew sales representative.
Solar PV ModuleInstallation Manual |Page 3

The module’s solar cell will generate direct current (DC) when it is exposed to direct sunlight
or other light sources, and direct contact with electricity live 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 are connected.
La cellule solaire du module générera un courant continu (CC) lorsqu'elle est exposée à la
lumière directe du soleil ou à d'autres sources lumineuses, et un contact direct avec des
parties électriques sous tension du module, telles que des bornes, peut entraîner des
blessures ou la mort, indépendamment du fait que pas le module et les autres équipements
électriques sont connectés.
In case of no connected load or external circuits, modules can still produce voltage. Please
use insulation tools and wear rubber gloves when operating modules in the sunlight.
En l'absence de charge connectée ou de circuits externes, les modules peuvent encore
produire de la tension. Veuillez utiliser des outils d'isolation et porter des gants en
caoutchouc lorsque vous utilisez des modules à la lumière du soleil.
Operating of PV modules can only be stopped when they are kept away from sunlight or
covered by hard board or UV-proof materials or when the sun-facing side of the module is
placed on a smooth and flat surface facing downwards.
Le fonctionnement des modules PV ne peut être arrêté que lorsqu'ils sont tenus à l'écart de
la lumière du soleil ou recouverts de panneaux durs ou de matériaux résistants aux UV ou
lorsque l'angle des modules face au soleil est placé sur des surfaces lisses et planes.
To avoid electric arc or electric shock hazards, please do not break down electric
connections in loaded conditions. Incorrect connections will also lead to an electric arc or
shock. Keep connectors dry and clean and make sure that they are in good operating
conditions.
Pour éviter les risques d'arc électrique ou de choc électrique, veuillez ne pas rompre la
connexion électrique dans des conditions de charge. Des connexions incorrectes
3.3. Electrical Performance Safety
Landscape
Required cable length will be mentioned in the product
datasheet
Solar PV ModuleInstallation Manual |Page 4

Broken glass either in front or rear can become an electrical safety hazard (may cause
electric shock or fire). These modules cannot be repaired and should be removed and
replaced immediately.
Le verre brisé à l'avant et à l'arrière peut entraîner un danger électrique (peut provoquer un
choc électrique ou un incendie). Ces modules ne peuvent pas être réparés et doivent être
retirés et remplacés immédiatement.
If the edge-sealing material of a module is damaged, this module needs to be isolated first
then either repaired or replaced immediately with new one.
Si le matériau d'étanchéité des bords est endommagé, ce module doit d'abord être isolé, puis
réparé et remplacé ou remplacé immédiatement par un nouveau.
Do not operate when modules are wet unless you wear PPE (personal protective
equipment). Please follow the cleaning requirements in this manual when cleaning modules.
Ne pas utiliser lorsque les modules sont mouillés, sauf si vous portez un EPI (équipement de
protection individuelle). Veuillez suivre les exigences de nettoyage de ce manuel lors du
nettoyage des modules.
3.4. Operation Safety
Do not damage the package and do not drop packaged modules to the ground.
N'endommagez pas l'emballage et ne laissez pas tomber les modules emballés sur le sol.
Do not exceed the indicated maximum layer limit on the packaging carton when piling
modules up.
Ne dépassez pas la limite maximale de couche indiquée sur le carton d'emballage lors de
l'empilement des modules.
Put packaging carton in the ventilated, water-proof and dry places before unpacking
modules.
Placez le carton d'emballage dans des endroits ventilés, étanches et secs avant de déballer
les modules.
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.
Si les modules sont stockés dans un environnement non contrôlé, la durée de stockage doit
être inférieure à 3 mois et des précautions supplémentaires doivent être prises pour éviter
que les connecteurs ne soient exposés à l'humidité ou à la lumière du soleil, comme
l'utilisation d'embouts de connecteur.
Stacks of modules should contain no more than 12 modules, and the frames should be
aligned. Do not place excessive loads on the module or twist the module frame.
entraîneront également un arc électrique ou un choc électrique. Gardez les connecteurs secs
et propres et assurez-vous qu'ils sont en bon état de fonctionnement.
Solar PV ModuleInstallation Manual |Page 5

Follow unpacking instructions when opening packaging carton.
Suivez les instructions de déballage lors de l'ouverture du carton d'emballage.
Do not lift or carry the modules using junction box wires attached to the modules.
Le transport des modules avec la boîte de jonction ou les fils est strictement interdit.
Do not stand or walk on modules.
Ne vous tenez pas debout ou ne marchez pas sur les modules.
To avoid damage to glass, heavy objects are not allowed on modules.
Pour éviter que le verre ne soit endommagé, les objets lourds ne sont pas autorisés sur les
modules.
Be careful when placing modules at corners in particular.
Soyez prudent lorsque vous placez des modules dans les coins en particulier.
Do not try to dismantle the module or remove nameplate or parts of modules.
N'essayez pas de démonter le module ou de retirer la plaque signalétique ou des parties de
modules.
Do not paint or apply any other adhesive on modules.
Ne peignez pas ou n'appliquez aucun autre adhésif sur les modules.
Do not damage or scratch backsheet of modules.
Ne pas endommager ni rayer la feuille arrière des modules.
Do not drill holes on the frame of module, this may reduce frame loading capacity and lead to
frame corrosion and invalidation of the limited warranty provided for customers.
Ne percez pas de trous sur le cadre du module, cela peut réduire la capacité de charge du cadre
et entraîner la corrosion du cadre et l'invalidation de la garantie limitée fournie aux clients.
Do not insert any conductive material into the connectors attached to the module.
N'insérez aucun matériau conducteur dans les connecteurs fixés au module.
Do not connect or disconnect the module when there is a current flow, or connected with any
powered system.
Ne pas connecter ou déconnecter le module lorsqu'il y a un flux de courant, ou connecté à un
système alimenté.
Do not use water to extinguish fires when the module is connected to any powered system.
N'utilisez pas d'eau pour éteindre les incendies lorsque le module est connecté à un système
alimenté.
Les piles de modules ne doivent pas contenir plus de 12 modules et les cadres doivent être
alignés. ·Ne placez pas de charges excessives sur le module et ne tordez pas le cadre du
module.
Solar PV ModuleInstallation Manual |Page 6

3.5. Fire Safety
Please refer to regional laws and regulations before installing modules and abide by the
building's fire safety standards and requirements. According to the corresponding
certification standards, the fire rating of ReNew modules is IEC Class C.
Do not carry modules on your head.
Ne portez pas de modules sur la tête.
Do not carry modules with ropes.
Ne transportez pas les modules avec des cordes.
Do not carry modules on your back.
Ne transportez pas les modules sur votre dos.
Do not artificially concentrate sunlight on the module.
Ne concentrez pas artificiellement la lumière du soleil sur le module.
During the normal operation of modules, they should not be blocked by buildings, trees,
chimneys, etc. at any time of the day.
Pendant le fonctionnement normal des modules, ils ne doivent pas être bloqués par des
bâtiments, des arbres, des cheminées, etc. à tout moment de la journée.
Do not scratch anodic coating of the aluminium alloy frame except for grounding
connection. Scratch may lead to frame corrosion and reduce frame loading capacity and
long-term reliability.
Ne rayez pas le revêtement anodique du cadre en alliage d'aluminium, sauf pour la connexion
de mise à la terre. Les rayures peuvent entraîner la corrosion du cadre et réduire la capacité
de charge du cadre et sa fiabilité à long terme.
Do not repair problematic modules on your own.
Ne réparez pas vous-même les modules problématiques.
The junction box must meet IP68 requirements, however they must be protected from direct
sunlight and water immersion. The interconnection of female-male connectors shall meet the
IP68 requirements.
La boîte de jonction doit répondre aux exigences IP68, mais elle doit être protégée de la
lumière directe du soleil et de l'immersion dans l'eau. L'interconnexion des connecteurs
femelle-mâle doit répondre aux exigences IP68.
The junction box connector should not be in contact with oily substances, organic solvents
and other corrosive materials, like alcohol, gasoline, lubricants, rust inhibitors, herbicides, to
avoid damage to the connector.
Le connecteur de la boîte de jonction ne doit pas être en contact avec des substances
huileuses, des solvants organiques et d'autres matériaux corrosifs, c'est-à-dire de l'alcool, de
l'essence, des lubrifiants, des inhibiteurs de rouille, des herbicides, pour éviter d'endommager
le connecteur.
Solar PV ModuleInstallation Manual |Page 7

4.1. Installation Safety
Always wear safety helmets, insulated gloves and insulated rubber shoes and other protective
measures during installation.
When installing or maintaining the PV system, please do not wear metal rings, watches and
other metal products, so as not to cause electric shock and damage the modules.
Keep the module unpacked until installation. Once the modules are removed from the pallet,
they shall be installed and connected to the inverter. If they are not installed immediately,
protective measures (such as adding rubber joint cover, etc.) should be taken on the
connection head.
Do not touch the PV module with bare hands during installation. The glass surface and the
frame may be hot. There is a risk of burns and electric shock. Use standard safety tools and
equipment when installing the modules.
Do not work in rain, snow or windy conditions.
Due to the risk of electrical shock, do not perform any work if the terminals of the module are
wet.
Use insulated tools and do not use wet tools.
Only the modules of the same size and the specifications within same range can be connected
in series.
Connect the male and female connectors correctly, check the wiring condition, and that no
wire is detached from the module, secure the wires with cable ties so that the wires do not
scratch or squeeze the backsheet of the modules.
4. Installation Conditions
Veuillez vous référer aux lois et réglementations régionales avant d'installer les modules et
respecter les exigences relatives à la protection contre les incendies des bâtiments. Selon les
normes de certification correspondantes, la résistance au feu du module photovoltaïque
ReNew modules est la classe CEI C.
Adopt proper module accessories such as fuse, circuit breaker and grounding connector
according to local regulations. Please do not apply modules where exposed inflammable gases
are nearby.
Adoptez les accessoires de module appropriés tels que le fusible, le disjoncteur et le
connecteur de mise à la terre conformément aux réglementations locales. Veuillez ne pas
appliquer de modules à proximité de gaz inflammables exposés.
Solar PV ModuleInstallation Manual |Page 8

In most applications, ReNew PV modules should be installed in a location where they can
receive maximum sunlight throughout the year.
When choosing a site, avoid trees, buildings or obstructions that could create shadows on
the modules. Shading causes loss of power output, even though bypass diodes have been
installed for the module, shading will aect the optimum performance and safety issue of the
PV modules. Operation in permanent shading conditions is not recommended.
The recommended weather conditions for installing modules are:
a) Humidity: < 85% RH
b) Ambient air temperature range: -40°C to + 40°C
4.2. Climatic Condition
Please consult the ReNew technical support department for more information on the use
of modules in special climates, such as an altitude greater than 2000m.
Make sure that the installed modules do not bear wind or snow load that exceeds the permissible
maximum load.
4.3. Site and tilt angle selection
4.3.1. Site Selection
Do not touch the junction box or the connectors with bare hands during installation or under
sunlight, regardless if the module is connected to or disconnected from the system.
Do not drill holes in the frame without authorization from ReNew, which may cause corrosion
or other negative eects to the module.
When installing modules on roof mounted structures, please try to follow the “from top to
bottom” and “from left to right” principles.
Thermal expansion and cold contraction eect occurs on the modules. During installation,
the interval between two adjacent modules is recommended ≥10mm. The minimum
clearance between two adjacent dual-glass modules is recommended ≥20mm. If there are
special requirements, please confirm with ReNew before installation.
Sucient clearance (at least 10 cm (3.94 in)) between the module frame and the mounting
surface is required to allow cooling air to circulate around the back of the module. This also
enables condensation or moisture to dissipate.
During the installation, as also for module removal, maintenance and any other related
processes, it is recommended that the force applied between the cable and the connector to
be no more than 60N.
Solar PV ModuleInstallation Manual |Page 9

Tilt angle of modules: Included angle between module surface and horizontal surface; the module
will obtain the maximum power output in direct facing of sunlight.
Modules are preferred to be south-facing in the northern hemisphere and north-facing in the
southern hemisphere. Please refer to standard module installation guideline or suggestions from
an experienced PV module installer, for the specific installation angle.
4.3.2. Tilt Angle Selection
PV Module
Tilt Angle
Do not install modules at places that are possible to be flooded.
Make sure that installed modules are not subjected to wind or snow pressure that exceeds
the permissible maximum load limit.
Do not install the PV module in a location where it would be immersed in water or continually
exposed to water from a sprinkler or fountain etc.
Carry out lightning protection for modules installed in places with frequent lightning and
thunder.
Modules cannot be used in environments with too much hails, snows, flue gas, air pollution
and soot or in places with strong corrosive substances such as salt, salt mist, saline, active
chemical steam, acid rain, or other substances corroding modules, aecting modules’ safety
or performance.
In places 50~500m away from the sea, stainless steel or aluminum materials should be used
when connecting the PV modules, and the installation position must be processed with
anti-corrosion treatment.
Figure 2 : Tilt Angle of PV Module
Solar PV ModuleInstallation Manual |Page 10

5.1. Regular Requirements
ReNew suggests that the tilt angle of module installation be no less than 10°, so that dust
accumulated on the module surface can be easily washed away by rainfall and the frequency of
cleaning modules is also reduced. This also makes it easy for accumulated water to flow away,
avoiding water marks on the glass due to prolonged ponding which might aect the module
appearance and performance.
ReNew modules connected in string should be installed with the same orientation and tilt angle.
Dierent orientations and tilt angles may result in dierent received solar irradiation and output
power loss. In order to achieve the maximum annual generating capacity, the optimal orientation
and inclination of PV modules in the installed area should be selected to ensure that sunlight can
still reach to modules even on the shortest day of the year.
Make sure that module installation mode and bracket system can meet the expected load,
which is the requisite assurance that the bracket installer must provide. Installation bracket
system shall be tested and inspected by a third-party testing institution with static mechanical
analysis capacity in accordance with local, national 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
is not shadowed by snow for a long time. In addition, make the lowest point of modules high
enough so as to avoid shading from vegetation or reduce damage from sand/stones.
Make sure that backsheets of modules are not 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.
Maximum static load of the PV module is downforce 5400pa (designed load of 3600Pa) and
uplift force 2400pa (designed load of 1600Pa), which can vary from dierent mounting
methods of the modules (please refer to the following installation guidance). The described
load in this manual is for the test load.
Maximum test load = 1.5 (Safety factor) x Design Load
Modules can be installed horizontally or vertically. When installing the components, be
cautious not to block the drain hole of the frame.
5. Mechanical Installation
Solar PV ModuleInstallation Manual |Page 11

The reference value of tightening torque for M8 bolt is 22-30 N*M, and for M6 bolt is 9-12 N*M. If
special mounting system or special installation method is required, please reconfirm with the
supplier of the racking system regarding the torque value.
Table 1: Bolts for dierent mounting holes
5.2. Bolt Mountings
8 outer mounting
holes, M8 bolts
4 inner mounting
holes, M6 bolts
Bolt
Washer
Washer
Spring washer
Aluminum frame
Bracket
Nut
Mounting Hole Bolt Size Tightening Torque
14mm x 9mm M8 22-30 N*M
10mm x 7mm M6 9-12 N*M
Mounting Hole Bolt Size Tightening Torque
10mm x 7mm M6 9-12 N*M
Figure 3: Mounting with bolt
Solar PV ModuleInstallation Manual |Page 12

Figure 5: Mounting hole position of bolt mounting for 5400Pa
Figure 4: Mounting hole position of bolt mounting for 2400Pa
Solar PV ModuleInstallation Manual |Page 13

The maximum allowed quantity of modules in string connection shall be calculated according to
relative regulations. The open circuit voltage value under the expected lowest temperature shall
not exceed the maximum system voltage value allowed by modules and other values required by
DC electric parts.
Applicable Model
Module Dimension Mounting Pitch
Length(mm) Width(mm) X-Pitch (mm) Y-Pitch (mm)
RPS1MH66BDXXX 2390 1303 1253 1000 1400
RPS1MH60BDXXX 2178 1303 1253 1000 1400
RPS2MH72BDXXX 2278 1134 1084 1000 1400
RPS1MH66MBXXX 2390 1303 1253 1000 1400
RPS1MH60MBXXX 2178 1303 1253 1000 1400
RPS2MH72MBXXX 2278 1134 1084 1000 1400
6. Electrical Installation
6.1. Electrical Performance
The reported performance measurements are subject to +_5% uncertainty at STC/BSTC
(1000W/m²Irradiance, a cell temperature of 25° and an AM1.5 spectrum) for voltage, current and
+_3% power, where standard test conditions (1000 W/m
2
, (25 +_ 2) °C, AM 1.5 according to IEC
60904-3) and BSTC (AM 1.5, T = 25 °C, Irradiance = 1000W/m
2
+ φ•135W/m
2
)
Maximum allowable system voltage for ReNew PV modules is 1500V, Class for protection
against electrical shock, in accordance with Clause 4 of IEC 61730-1:2016 is CLASS II.
When modules are in series connection, the string voltage is sum of individual modules in one
string.
When modules are in parallel connection, the current is sum of the individual string current.
Modules with dierent electric performance models cannot be connected in one string.
Blocking Diode Over Current Protection Device Connector
Figure 7: Parallel Connection
Table 2: Mounting hole position for applicable module
Figure 6: Series String Connection
Solar PV ModuleInstallation Manual |Page 14

If there is reverse current exceeding the maximum fuse current flowing through the module, use
overcurrent protection device with the same specifications to protect the module; if parallel
connection is more than 2, there must be an overcurrent protection device on each string of
module. Below table indicates advisable maximum overcurrent rating:
a) If modules are connected in series, the total voltage is equal to the sum of individual
voltages. The recommended system voltage is as below,
Under certain conditions, a module may produce more current or voltage than under its Standard
Test Condition's rated power. As a result, the module short-circuit current under STC should be
multiplied by 1.25. Depending on your local regulations, an additional 1.25 multiplier for the
short-circuit current (giving a total multiplier of 1.56) may be applicable when sizing conductors
and fuses.
b) If the modules are connected in parallel, the recommended number of modules in
parallel is maximum series fuse rating/I
sc
+1
System voltage ≥N*V
oc
[1+TcV
oc
* (Tmin-25)]
Where:
N - module numbers in series
V
oc
- Open circuit voltage (refer to product data sheet)
TcV
oc
- Temperature coecient of open circuit voltage (refer to product datasheet)
T
min
- Minimum ambient temperature
Applicable Model Module Type Maximum Overcurrent
Protection Rating
RPS1MH66BDXXX Bifacial 35A
RPS1MH60BDXXX Bifacial 35A
RPS2MH72BDXXX Bifacial 30A
RPS1MH66MBXXX Monofacial 30A
RPS1MH60MBXXX Monofacial 30A
RPS2MH72MBXXX Monofacial 25A
The module is considered to be in compliance with this standard only when the module is mounted
in the manner specified by the mounting instructions. A module with exposed conductive parts is
considered to be in compliance with this standard only when it is electrically grounded in
accordance with the instructions and the requirements of the National Electrical Code, ANSI/NFPA
70 (2014-2017)
Table 3 : Maximum overcurrent protection rating for applicable model
Solar PV ModuleInstallation Manual |Page 15

6.2. Cables and Wiring
Correct Routing of cableIncorrect Routing of cable
Bend
Radius
In module design, adopt junction boxes with the protective level of IP68 for on-site connection to
provide environmental protection for wires and connections and contacting protection for
non-insulating electric parts. The junction box performs the protective level of IP68 with
well-connected cables and connectors. These designs facilitate parallel connection of modules.
Each module has two individual wires connecting the junction box, one is a negative pole and the
other is a positive pole. Two modules can be in series connection by inserting the positive pole at
one end of the wire of one module into the negative pole of the adjoining module.
According to local fire protection, building and electrical regulations, apply proper cable and
connector; ensure the electrical and mechanical property of the cables (the cables should be put
in a catheter with anti-UV aging properties, and if exposed to air, the cable itself should have
anti-UV aging capability).
The installer can only use single-wire cable, 2.5-16mm2 (5-14 AWG), 90°C, with proper insulation
capability to withstand the maximum open circuit voltage (such as EN50618 approval). Need to
select appropriate wire specifications to reduce voltage drop.
ReNew requires that all wiring and electrical connections comply with the appropriate ‘Electrical
Code’. When cables are fixed on the bracket, avoid mechanical damage to cables or modules. Do
not press cables by force. Adopt UV-resistant cable ties and clamps to fix cables on the bracket.
Though cables are UV resistant and waterproof, it is still necessary to prevent cables from direct
sunlight and water immersion. The minimum bending radius of cables should be 43mm (1.69in).
6.3. Connectors
Please keep connectors clean and dry. Make sure connector caps are fastened before connection.
Do not connect under improper conditions of damp, dirty or other exceptional situations. Avoid
exposing connectors to direct sunlight and water immersion or falling onto ground or roof.
Incorrect connection may lead to electric arc and electric shock. Please make sure that all electric
connections are reliable. Make sure all connectors are fully locked. Only compatible connectors
that can be mated, i.e. from the same vendor and model, shall be used. For approved connector
make of each PV model as per IEC CDF, kindly connect with the ReNew technical team.
Figure 8: Routing of cable
Solar PV ModuleInstallation Manual |Page 16

PV module junction box contains bypass diode which is in parallel connection with the cell string.
If hot spot occurs, the diode will come into operation to stop the main current from flowing
through the hot spot cells in order to prevent module over-heated and performance loss. Notice,
bypass diode is not the overcurrent protection device. If the diode is suspected to be defective, the
installer or system maintenance supplier shall contact ReNew. Please do not try to open the
module junction box on your own.
6.4. Bypass Diode
7. Grounding
In design of modules, the anodized corrosion resistant aluminum alloy frame is applied for rigidity
support. For safety utilization and to protect modules from lightning and static electricity damage,
the module frame must be grounded. The grounding device must be in full contact with inner side
of the aluminum alloy and penetrate surface oxide film of the frame.
Do not drill additional grounding holes on module frame.
The grounding conductor or wire may be copper, copper alloy, or any other material acceptable
for application as an electrical conductor as per respective National Electrical Codes. The
grounding conductor must then make a connection to the ground with a suitable ground
electrode. Holes marked with a grounding mark on the frame can only be used for grounding but
not for mounting.
Holes provided for this purpose are identified with a grounding symbol (IEC61730-1).
Grounding connections should be installed by a qualified electrician. Connect module frames
together using adequate grounding cables: Grounding wire size (4-16 mm
2
/12-6 AWG solid bare
copper) should be selected and installed underneath the wire binding bolt.
The electrical contact is made by penetrating the anodized coating of the aluminum frame and
tightening the mounting screw (together with the star washer) to the proper torque of 3-7 N.m.
Slider
Bolt
Base
Nut
Wire slot for 4 to 16 mm
2
cable
Wire bolt and Slot
Mounting wash hex nut
Aluminium frame
4 to 16 mm
2
cable
Hex nut
Figure 9: PV module grounding methods
Solar PV ModuleInstallation Manual |Page 17

8.1. Cleaning
8. Operation and Maintenance
It is the user’s responsibility to carry out regular inspection and maintenance of modules, especially
during the period of limited warranty; and inform the supplier within two weeks when modules are
found broken.
The site environment conditions and frequency of cleaning the module can be fixed/altered
if output from module is reduced.
Module cleaning to be done before sunrise and after sunset to prevent thermal stress.
Cleaning process must be carried out after PV modules power is oand modules are cooled.
Determine the module glass temperature; if glass is too hot it will be damaged by the
application of cold-water spray. Dierence in water and glass temperature should be less
than (5oC ~ 8oC).
Deposit such as dry floating dust and leaves on the module surface should be whisked o
with a dry whisk or cloth.
For inorganic wet dust which is not easy to clean, carry out general cleaning mentioned
above. Then, use clean water (<400TDS) with pressure not exceeding 35bar for wash clean.
To clean organic dust like bird dropping, plant sap etc., first use clean water with pressure
not exceeding 35bar. Then, clean with mild soap water with water gun at not less than 0.5
meters distance having water pressure not exceeding 35bar.
After washing with mild soap water, rinse with clean water.
Use soft sponge or cotton to wipe the components gently without application of force or
scratching.
Accumulation of dust or dirt on the module front face will result in a decreased energy output.
Clean the module preferably once every year, (more frequently in dusty conditions), using a soft
cloth (dry /damp). Water with high mineral content may leave deposits on the glass surface and is
not recommended. It is recommended to use neutral water of the PH value ranging from 6.5 to 8.5
to clean the glass, so as to not cause damage to the glass coating layer.
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Do not use high pressure water.
Do not use harmful chemicals.
Do not use cold water when the module glass temperature is high.
Do not use hot water to clean cold panel. Thermal shock from the dierence in
temperature between the glass surface and water can result in fracturing or breaking of the
glass.
Never spray water on broken modules.
Do not clean with bare hands. Clean after wearing gloves.
Do not use tools like knife, blade, wire etc., for cleaning.
Do not stand on the panels for cleaning.
Module glass cracks.
Corrosion at welding parts of the cell main grid (caused by moisture into the module to
damage of sealing materials during installation or transportation).
Check whether there are traces of burn marks on the module back sheet.
Check PV modules if there are any signs of aging including rodent damage, climate aging,
connectors tightness, corrosion and grounding condition.
Check if any sharp objects are in contact with the surface of the PV module.
Check if there are any obstacles causing shading of the PV module.
Check if there are any loose or damaged screws in between the modules and mounting
system. If so, adjust or fix them on time.
Check the tightness of the connectors and cables twice a year.
Check if there is any crack or gap of silicone near the junction box, annually.
8.2. Cleaning Precautions
8.3. Module Appearance Inspection
Check module cosmetic defects with naked eyes, especially:
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