PHOTOWATT PW72HT-CB-XF User manual

INSTALLATION MANUAL
OF BIFACIAL MODULES
For professional use only

D84-P06-01 GB R7 25/01/2023 www.photowatt.com
1.0 GENERAL INFORMATION 3
1.1 INSTALLATION MANUAL DISCLAIMER 3
1.2 LIMITATION OF LIABILITY 3
2.0 SAFETY PRECAUTIONS 3
3.0 MECHANICAL / ELECTRICAL SPECIFICATIONS 4
4.0 UNPACKING AND STORAGE 5
5.0 MODULE INSTALLATION 6
5.1 MODULE WIRING 9
5.2 GROUNDING 12
6.0 MOUNTING INSTRUCTIONS 13
6.1 MOUNTING METHODS: BOLTING 14
6.2 MOUNTING METHODS: CLAMPING SYMMETRICALLY TO THE MODULE AXIS 16
6.3 MOUNTING METHODS (SINGLE-AXIS TRACKER) 18
7.0 MAINTENANCE 20
8.0 MODULE CLEANING GUIDELINES 21
ANNEX A: GUIDANCE ON MODULE TEMPERATURE FOR SEVERAL LOCATIONS 22
ANNEX B : COASTAL AREA ANTI-CORROSION INSTALLATION GUIDELINES 23
INDEX

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1.0
GENERAL INFORMATION
This general manual provides important safety information
relating to the installation, maintenance and handling of bi-
facial double glass solar modules.
Professional installer must read these guidelines careful-
ly and strictly follow these instructions. Failure follow these
instructions may result in death, injury or property damage.
The installation and handling of PV modules requires pro-
fessional skills and should only be performed by qualified
professionals. Installers must inform end -users (consumers)
about the aforesaid information accordingly.
The word “module” or “PV module” used in this manual refers
to one or more double glass solar modules. This manual is only
valid for the bifacial double glass module types PW72LHT-
CB-XF, PW72HT-CB-XF, PW60HT-CB-XF, PW78LHT-CB-
XF, PW66MAX-CB-XF and PW60MAX-CB-XF.
Please retain this manual for future reference.
We recommend visiting www.photowatt.com regularly for
the most updated version of bifacial module installation
manual. This installation manual is applicable for EU and
EEA countries only.
1.1
INSTALLATION MANUAL DISCLAIMER
The information contained in this manual is subject to change
by EDF ENR PWT without prior notice.
EDF ENR PWT gives no warranty of any kind whatsoever,
either explicitly or implicitly, with respect to the information
contained herein.
In the event of any inconsistency among different language
versions of this document, the English version shall prevail.
Please refer to our product lists and documents published
on our website at: www.photowatt.com as these lists are up-
dated on a regular basis.
1.2
LIMITATION OF LIABILITY
EDF ENR PWT shall not be held responsible for damages of
any kind, including– without limitation – bodily harm, injury or
damage to property, in connection with handling PV mod-
ules, system installation, or compliance or non-compliance
with the instructions set forth in this manual.
2.0
SAFETY PRECAUTIONS
Warning: Before attempting to install, wire, op-
erate and/or service the module and other elec-
trical equipment, all instructions should be read
and understood. PV module connectors pass
direct current (DC) when exposed to sunlight or other light
sources. Contact with electrically active parts of the mod-
ule, such as terminals, can result in injury or death, irrespec-
tive of whether or not the module and the other electrical
equipment have been connected.
GENERAL SAFETY
All Modules must be installed by licensed electricians in ac-
cordance with the applicable electrical codes such as, the
latest National Electrical Code (USA) or Canadian Electric
Code (Canada) or other national or international electrical
codes.
Protective clothing (non-slip gloves, clothes, etc.)
must be worn during installation to prevent direct
contact with 30 VDC or greater, and to protect
hands from sharp edges.
Prior to installation, remove all metallic jewelry to
prevent accidental exposure to live circuits.
When installing modules in light rain, morning dew,
take appropriate measures to prevent water in-
gress into the connectors.
Do not allow children or unauthorized persons near
the installation site or module storage area.
• Use electrically insulated tools to reduce the risk of elec-
tric shock.
• If the disconnects and over current protective devices
(OCPD) cannot be opened or the inverter cannot be
powered down, cover the fronts and backs of modules
in the PV array with an opaque material to stop the
production of electricity when installing or working on a
module or wiring.
• Do not install modules in strong wind.
• Do not use or install broken modules.
• Do not contact module surface if the front or rear glass
is broken. This may cause electric shock.
• Do not attempt to repair any part of the PV module. The
module does not contain any serviceable parts.
• Do not open the cover of the junction box at any time.
• Do not disassemble a module or remove any module
part.
• Do not artificially concentrate sunlight on a module.
• Do not connect or disconnect modules when current
from the modules or an external source is present.

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3.0
MECHANICAL / ELECTRICAL SPECIFICATIONS
Module electrical ratings are measured under Standard
Test Conditions (STC) of 1000 W/m2 irradiance, with an
AM 1.5 spectrum, and a cell temperature of 25°C. Detailed
electrical and mechanical characteristics of EDF ENR PWT
crystalline silicon PV modules can be found in each prod-
uct's datasheet. Main electrical characteristics under STC
are also stated on each module label. Please refer to the
datasheet or the product nameplate for the maximum sys-
tem voltage.
Under certain conditions, a module may produce more cur-
rent or voltage than its Standard Test Conditions rated pow-
er. As a result, the module short-circuit current under STC
should be multiplied by 1.25, and a correction factor should
be applied to the open-circuit voltage (see Table 1 below),
when determining component ratings and capacities.
TABLE 1. LOW TEMPERATURE CORRECTION
FACTORS FOR OPEN-CIRCUIT VOLTAGE
Lowest Expected Ambient
Temperature (°C/°F)
Correction factor
24 to 20 / 76 to 68 1.02
19 to 15 / 67 to 59 1.04
14 to 10 / 58 to 50 1.06
9 to 5 / 49 to 41 1.08
4 to 0 / 40 to 32
-1 to -5 / 31 to 23
1.10
1.12
-6 to -10 / 22 to 14 1.14
-11 to -15 / 13 to 5 1.16
-16 to -20 / 4 to -4 1.18
-21 to -25 / -5 to -13 1.20
-26 to -30 / -14 to -22 1.21
-31 to -35 / -23 to -31 1.23
-36 to -40 / -32 to -40 1.25
Alternatively, a more accurate correction factor for the
open-circuit voltage can be calculated using the following
formula:
Cvoc = 1-αVoc x (25 - T)
T (°C) is the lowest expected ambient temperature at the
system installation site
αVoc (%/ºC) is the voltage temperature coefficient of the se-
lected module (refer to corresponding datasheet)
OCPD rating selection should be done per the following
guidance, where the minimum OCPD rating possible is de-
termined by calculating the expected maximum circuit cur-
rent for the PV system, and the maximum OCPD rating con-
strained by the IEC 61215: 2016 and UL61703 standard
requirements for the certified PV modules.
Minimum string fuse rating < X ≤ Maximum string fuse
rating
The maximum string fuse ratings can be found on the prod-
uct's datasheet for all the certified EDF ENR PWT bifacial
module types.
The minimum string fuse rating for compliance with NEC:
2017 code and IEC62548: 2016 requirement is suggested
to be determined as follows:
Minimum string fuse rating = IscSTC x 1.25 x Max (1.175,
Imppα÷ ImppSTC)
Imppα= the highest 3-hour current average resulting
from the simulated local simultaneous irradiances on the
front and rear sides of the PV array accounting for eleva-
tion and orientation.
IscSTC = the listed short circuit current at 0% bifacial gain
on the PV module datasheet or nameplate label
ImppSTC = the listed MPP operating current at 0% bifacial
gain on the PV module datasheet or nameplate label
An assembly, together with its overcurrent device (s), that is
listed for continuous operation at 100 percent of its rating
shall be permitted to be used at 100 percent of its rating,
and therefore shall not require the additional 1.25 multiplier.
Electrical calculations and design must be performed by a
competent engineer or consultant.
Please contact EDF ENR PWT’s technical support team for
additional information pertaining to engineering optimiza-
tion and approval of project specific module string lengths.

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During unpacking, the unpacked modules should be prop-
erly fixed. After unpacking, it is recommended to place the
remaining un-installed modules horizontally on a pallet, not
exceeding the total number of 12 modules in one stack. Vis-
it our website or contact your EDF ENR PWT representative
for more detailed unpacking requirements.
• Do not lift modules by their wires or junction box, lift
them by the frame.
• Do not allow the modules to sag or bow under their own
weight when being carried.
• Stacking of modules should be limited to no more than
12 modules and frames should be aligned with one an-
other on the pile.
• Do not place excessive loads on the module or twist the
module
• Do not carry modules on your head.
• Do not drop or place objects (such as tools) on the
modules.
• Do not use sharp instruments on the modules.
• Do not leave modules unsupported or unsecured.
• Do not stand, step, walk and/or jump on modules under
any circumstances. Localized heavy loads may cause
severe micro-cracks at cell level, which may compromise
module reliability and void EDF ENR PWT's warranty.
For modules vertically packed (PW60MAX-CB-
XF and PW66MAX- CB-XF), one person must
be present to prevent the unpacked modules
from falling during the unpacking process.
Please use an anti-tipping structure. Such structure can be
built with the pallet’s own wooden frame according to the
instructions:
4.0
UNPACKING AND STORAGE
PRÉCAUTIONS
• Modules should be stored in a dry and ventilated envi-
ronment to avoid direct sunlight and moisture. If mod-
ules 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. In any circumstances, pallets with
landscape-oriented module packaging shall not be
stacked vertically more than two high; and for pallets
with portrait-oriented module packaging, stacking is
not allowed.
When unloading modules pallet from a flatbed
truck, please use a fork lift to remove the mod-
ule pallets. When unloading module pallets from
containers, please use a forklift to remove the
module pallets from the container or trailer. Do not move
any pallets within the container or trailer without properly
lifting them first. The forklift should be close to the ground in
order to avoid the top of module pallets from touching the
top of the cabinet door. For unloading pallets of PW66MAX-
CB-XF and PW60MAX-CB-XF modules, the thickness of the
forklift blades should be less than 80 mm, the length of the
forklift blades should be longer than 1250 mm and the dis-
tance between the forklift blades should be wider than 600
mm (from middle to middle of the forklift blades). Visit our
website or consult your EDF ENR PWT representative for
more detailed PW66MAX-CB-XF and PW60MAX-CB-XF
unloading instructions.
• Unpack module pallets carefully, following the steps
shown on the pallet. Unpack, transport and store the
modules with care.
• Modules must always be unpacked and installed by at
least two people. Always use both hands when han-
dling modules with gloves.

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PRODUCT IDENTIFICATION
Each module has three identical barcodes (one in the lam-
inate under the front glass, the second on the rear side of
the module and the third on the frame) that act as a unique
identifier. Each module has a unique serial number contain-
ing 14 digits or 16 digits.
A nameplate is also affixed to the rear glass of each module.
This nameplate specifies the model type, as well as the main
electrical and safety characteristics of the module. It also in-
cludes the barcode with the module unique serial number as
mentioned above.
5.0
MODULE INSTALLATION
PRECAUTIONARY MEASURES AND
GENERAL SAFETY
• Prior to installing modules please obtain information
about any requirements and necessary approvals for
the site, installation and inspection from the relevant
authorities.
• Check applicable building codes to ensure that the
construction or structure (roof, facade, support, etc.)
can bear the module system load.
• EDF ENR PWT solar modules have been qualified for
Application Class A (equivalent to Safety Class II re-
quirements). Modules rated under this class should
be used in systems operating at voltage above 50V or
power above 240W, where general contact access is
anticipated.
• EDF ENR PWT bifacial double glass modules have
been certified as Type 29 according to UL 61730 and
as Class A or Class C for fire performance according to
IEC 61730-2 for fire class performance, please refer
to the datasheet or the product nameplate for the de-
tailed types.
• Consult your local authority for guidelines and require-
ments for building or structural fire safety.
UL 1703 SYSTEM FIRE RATING REQUIREMENTS
• The fire rating of this module is only valid when the
product is installed as specified in the mechanical
mounting instructions.
• When installing the modules, ensure the assembly is
mounted over a fire-resistant roof covering rated for
the application.
• Photovoltaic systems composed of UL 61730 certified
modules mounted on a UL2703 certified mounting
system should be evaluated in combination with roof
coverings in accordance with UL 61730 standard, with
respect to meeting the same fire classification as the
roof assembly.
• Mounting systems with a System Fire Class Rating
(Class A, B or C), tested in conjunction with fire rated
“Type 29” rated modules, are considered acceptable
for use with EDF ENR PWT modules, provides the
mounting system does not violate any other require-
ment of this manual.
• Any mounting system limitations on inclination or ac-
cessories required to maintain a specific System Fire
Class Rating should be clearly specified in the instal-
lation instructions and UL2703 certification of the
mounting system supplier.
ENVIRONMENTAL CONDITIONS
• PV modules are intended for use in general open-air cli-
mates, as defined in IEC 60721-2-1: Classification of
environmental conditions Part 2-1: Environmental condi-
tions appearing in nature. Temperature and humidity.
• It is recommended that PV modules be installed in an
environment with ambient temperature ranges from
-40 °C to + 40 °C.
• The 98th-percentile of the module operational tem-
perature must be of 70 °C or lower under any mounting
conditions.
• This environmental temperature range encompass-
es many locations and installation methods. Annex A
provides the reader with modelled PV module tem-
perature examples, at the 98th-percentile depending
on the different mounting method and worldwide loca-
tions.
• Do not change the wiring of bypass diodes.
• Keep all electrical contacts clean and dry at all times.
• Do not expose the modules and its electrical contacts
(junction boxes, connectors) to any unauthorized
chemical substance (e.g. oil, lubricant, pesticide, pet-
rol, white flower oil, activating collaterals oil, mold tem-
perature oil, machine oil (such as KV46), grease (such
as Molykote EM-SOL, etc.), lubricating oil, antirust oil,
stamping oil, butter-cooking oil, propyl alcohol, ethyl al-
cohol, essential oil, bone-setting water, Tianna water,
mold release agent (such as Pelicoat S-6, etc.), glue
and potting glue that can generate oxime gas (such
as KE200, CX-200, Chemlok, etc.), TBP (plasticizer),
cleaning agents, pesticide, paint strippers, adhesives,
antirust agent, disincrustant, emulsifying agent, cut-
ting oils and cosmetics, etc.) as modules may incur
damages. Please contact your EDF ENR PWT repre-
sentative for more detailed requirements.

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• Please consult the EDF ENR PWT technical support de-
partment for more information on the use of modules in
special climates, such as an altitude greater than 2000
m, heavy snow, severe hail storm, hurricane etc.
• Do not install modules near open flames or flammable
materials.
• Do not immerse modules in water or constantly expose
modules to water (either fresh or salt) (i.e. from foun-
tains, sea spray).
• Exposing modules to salt (i.e. marine environments) or
sulfur (i.e. sulfur sources, volcanoes) incurs the risk of
module corrosion.
• Do not expose modules and their connectors to any un-
authorized chemical substances (e.g. oil, lubricant, pes-
ticide, etc.), as modules may incur damages.
• EDF ENR PWT modules have passed salt mist corro-
sion resistance test according to IEC 61701, but the
corrosion may still occur on where the modules frame
is connected to the bracket or where the grounding is
connected. Should the installation location be near the
ocean, EDF ENR PWT recommends stainless steel or
aluminum materials be used in the areas with direct
contact with the PV modules, and the connection point
should be protected with anti- corrosion measures. For
more information, please contact EDF ENR PWT tech-
nical support team.
INSTALLATION REQUIREMENTS
• Ensure that the module meets the general technical
system requirements.
• Ensure that other systems components do not damage
modules mechanically or electrically.
• Modules can be wired in series to increase voltage or
in parallel to increase current. To connect modules in
series, connect the positive terminal of one module to
the negative terminal of the next module. To connect in
parallel, connect the positive terminal of one module to
the positive terminal of the next module.
• The quantity of bypass diodes in the module’s junction
box provided may vary depending on the model series.
• Only connect the quantity of modules that corresponds
to the voltage specifications of the inverters used in the
system. In addition modules must NOT be connected
together to create a voltage higher than the maximum
permitted system voltage stated on the module name-
plate, even under the worst local temperature condi-
tions (see Table 1 for the correction coefficients that
apply to open-circuit voltage).
• A maximum of two strings can be connected in parallel
without using an over-current protection device (fuses,
etc.) incorporated in series within each string. Three or
more strings can be connected in parallel if an appro-
priate and certified over-current protection device is in-
stalled in series with each string. And it shall be ensured
in the PV system design that the reverse current of any
particular string is lower than the module maximum fuse
rating under any circumstances.
• Only modules with similar electrical parameters should
be connected in the same string to avoid or minimize
mismatch effects in arrays.
• To minimize risk in the event of an indirect lightning
strike, avoid forming loops with the wiring when design-
ing the system.
• The recommended maximum series fuse rating is stat-
ed on the product's datasheet.
• Modules should be safely fixed to bear all expected
loads, including wind and snow loads.
• For framed modules, a minimum clearance of 6.5 mm
(0.25 in) between modules is required to allow thermal
expansion of the frames and modules.
OPTIMUM ORIENTATION AND TILT
• To maximize the annual yield, please calculate the opti-
mum orientation and tilt for PV modules in that specific
installation site. The highest yields are achieved when
sunlight shines perpendicularly onto the PV modules.
AVOID SHADING
• Modules shall not be permanently shaded (including
partial shading, spot shading, even shading or uneven
shading) under any circumstances. Permanent shad-
ing includes shading of the same cell, cell row, or mod-
ule portion for extended and repeated periods of time
(e.g. more than 200 daylight hours over the warrantied
service lifetime). Power dissipated in fully or partially
shaded cells will result in power loss, reduced yield and
can cause localized overheating, which in turn may
negatively impact the module service lifetime. Perma-
nent shading may cause accelerated ageing of the en-
capsulation material and place thermal stress on the
bypass diodes. This would void the module’s warranty
unless properly mitigated through the use of Module
Level Power Electronic (MLPE) devices.

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8
• Regular maintenance is required to keep modules
clean. Particular measures should be taken to avoid
permanent shading from dirt or debris (e.g., plants, bird
droppings, etc).
• Do not install modules directly behind any object (e.g.,
tree, antenna, etc) to prevent occurrence of permanent
shading.
• Even temporary partial shading will reduce the energy
yield A module can be considered to be unshaded if its
entire surface is free from shading all year round, includ-
ing on the shortest day of the year.
• For optimizing the power generation of the rear side of
bifacial modules, obstacles between modules and the
mounting ground should be avoided as much as possible.
RELIABLE VENTILATION
• Bifacial modules use direct, reflected, or diffuse sunlight
on the backside to generate additional power. There-
fore, bifacial modules are not suggested to be used in
building attached photovoltaic systems (BAPV). If BAPV,
or similar mounting is still required, sufficient clearance
of at least 10 cm (3.94 in) between the module and the
mounting surface needs to be provided to allow cooling
air to circulate around the back of the module. This also
allows condensation or moisture to dissipate.
• According to UL61730, any other specific clearance
required for maintaining a system fire rating should
prevail. Detailed clearance requirements pertaining to
system fire ratings must be provided by your racking
supplier.
5.1
MODULE WIRING
CORRECT WIRING SCHEME
• Ensure that the wiring is correct before starting up the
system. If the measured open circuit voltage (Voc) and
short-circuit current (Isc) differ substantially from the
specifications, this indicates that there is a wiring fault.
• When modules have been pre-installed but the system
has not been connected to the grid yet, each module
string should be kept under open-circuit conditions and
proper actions should be taken to avoid dust and mois-
ture penetration inside the connectors.
• For double glass modules, EDF ENR PWT offers several
cable length options to match various system configu-
rations which are shown in table 2. In case a jumper ca-
ble is needed, please contact your EDF ENR PWT sales
representative.
• Cables should always be fastened on module frames
or mounting rails, in order to avoid shading on module
rear side.
• In case where a cable connection method not includ-
ed in below table is used, please confirm suitable cable
length with EDF ENR PWT’s sales representative.
• On below figures, bold lines represent cable installation
pathways, while + and - connector correspond to posi-
tive and negative module terminals respectively.

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Module types Recommended wiring configurations
PW72HT-CB-XF
PW60HT-CB-XF
PW72LHT-CB-XF
PW78LHT-CB-XF
PW60MAX-CB-XF
PW66MAX-CB-XF
Landscape installation two rows:
PW 60HT-CB-XF
Cable length options = 1400 mm
PW72HT-CB-XF/ PW72LHT-CB-XF/ PW78LHT-CB-XF/ PW60MAX-CB-XF/ PW66MAX-CB-XF
Cable length options = 1400 mm
NOTICE :
Adjacent modules in the same row need to be rotated 180 degrees for proper installation.
Portrait installation one row:
PW72HT-CB-XF / PW60HT-CB-XF / PW72LHT-CB-XF Cable length per lead = 400 mm (+),
280 mm (-)
PW78LHT-CB-XF Cable length per lead = 410 mm (+), 290 mm (-)
PW60MAX-CB-XF / PW66MAX-CB-XF Cable length per lead = 460 mm (+), 340 mm (-)
TABLE 2 : SYSTEM CABLE CONFIGURATION FOR PW72LHT-CB-XF, PW72HT-CB-XF, PW60HT-CB-XF,
PW78LHT-CB-XF, PW60MAX-CB-XF & PW66MAX-CB-XF MODULES

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Module types Recommended wiring configurations
PW72HT-CB-XF
PW60HT-CB-XF
PW72LHT-CB-XF
PW78LHT-CB-XF
PW60MAX-CB-XF
PW66MAX-CB-XF
PW72HT-CB-XF
PW72LHT-CB-XF
PW78LHT-CB-XF
Portrait installation two rows:
PW60HT-CB-XF Cable length = 400 mm (+), 280 mm(-) &1400 mm jumper cable
PW72HT-CB-XF / PW72LHT-CB-XF Cable length = 400 mm (+), 280 mm (-) & 1800 mm jumper
cable
PW78LHT-CB-XF Cable length = 410 mm (+), 290 mm (-) & 2000 mm jumper cable
PW60MAX-CB-XF Cable length = 460 mm (+), 340 mm (-) & 2000 mm jumper cable
PW66MAX-CB-XF Cable length = 460 mm (+), 340 mm (-) & 2150 mm jumper cable
NOTICE Modules in adjacent rows should be rotated 180 degrees for proper installation
Portrait installation one row: (Leap-frog for single-axis tracker)
PW72HT-CB-XF Cable length = 1670 mm (+), 1670 mm (-)
PW72LHT-CB-XF / PW78LHT-CB-XF Cable length = 1850 mm (+), 1850 mm (-)
The maximum distance between two adjacent modules should be within 50 mm (1.96 in) for side with mounting clamps, and
within 25 mm (0.98 in) for side without mounting clamps, in order to meet system cable scheme.
Jumper
Cable