1
MODEL
ND-AK270, ND-AK275
CAUTION: HIGH VOLTAGE
To reduce the risk of electric shock, do not touch.
PLEASE READ THIS MANUAL CAREFULLY BEFORE INSTALLING OR USING THE MODULES.
PLEASE PASS ALONG THE ATTACHED USER MANUAL TO YOUR CUSTOMER.
INSTALLATION MANUAL
– Crystalline Photovoltaic Module –
# IMPORTANT SAFETY INSTRUCTIONS p.1
# GENERAL INSTRUCTIONS p.1 ~ p.3
# INSTALLATION MANUAL -PHOTOVOLTAIC MODULES- p.4
# ELECTRICAL OUTPUT AND THERMAL CHARACTERISTICS p.4
IMPORTANT SAFETY INSTRUCTIONS
This manual contains important safety instructions for the PV module that must be
followed during the maintenance of PV modules.
To reduce the risk of electric shock, do not perform any servicing unless you are
qualified to do so.
1. The installation must be performed by a certified installer /servicer to ensure
system integrity and safety.
2. The installation is only allowed after referring and understanding of this
INSTALLATION MANUAL. If you don’t have your personal copy, please
contact your installer or local Sharp office listed in Sh arp Solar web site :
URL : http://www.sharp-world.com/solar
3. Do not pull the PV cables.
4. Do not touch any surface of module.
5. Do not place/drop objects onto the PV modules.
6. Do not disassemble or attempt to repair the PV module by yourself.
7. Do not drop the PV module.
8. Do not damage, pull, bend, or place heavy material on cables.
9. Upon completion of any service or repairs, ask the installer/servicer to
perform routine checks to determine that the PV modules are in safe and
proper operating condition.
1. INTRODUCTION
This Installation Manual contains essential information for the electrical and mechanical installation that you must know before
installing SHARP 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 SHARP and based on the technologies and experiences that have been acquired and
accumulated in the long history of SHARP. This document does not constitute a guaranty, expressed or implied. SHARP 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 SHARP for any infringement of
patents or other rights of third parties that may result from use of PV module. SHARP reserves the right to make changes to the
product, specifications or installation manual without prior notice.
2. COMPONENTS
GENERAL INSTRUCTIONS
10. When replacement parts are required, be sure the installer/servicer uses
parts specified by the manufacturer with same characteristics as the original
parts. Unauthorized substitutions may result in fire, electric shock, or other
hazard.
11. Consult your local building and safety department for required permits and
applicable regulations.
12. In regions with snow, the module can sustain a snow load of up to 50cm
(when the module is mounted in the portrait orientation / short frame side
facing down) or 100cm (when the module is mounted in the landsc ape
orientation / long frame side facing down).
13. As a result of sliding snow, the mechanical load increases when the number
of module rows in the matrix of a PV installation increases. When mounting
the module in the portrait orientation for more than 3 rows, the accumulated
snow load may cause the lower edge of the module frame to deform. Take
necessary measures (e.g. snow stopper) to avoid possible damage.
14. Periodically remove any overhanging snow and/or ice from the module
framework as it may cause deformation of the module frame.
3. GENERAL INFORMATION
(INCLUDING WARNING AND 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 be aware that there is a serious risk of
various types of injury occurring during the installation including
the risk of electric shock. All SHARP PV modules are equipped
with a permanently attached junction box that will accept variety
of wiring applications or with a special cable assembly for ease
of installation, and they do not require special assembly.
GENERAL WARNING
1. PV modules are heavy. Handle with care.
2. Before you attempt to install, wire, operate and maintain
the PV module, please make sure that you completely
understand the information described in this installation
manual.
3. Contact with electrically active parts of a PV module such
as terminals can result in burns, sparks and lethal shock
whether the PV modules are connected or not.
4. PV modules produce electricity when the sufficient 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
SIM426-005
2
produce high voltage and current which could present an
increased hazard and may cause serious injury or death.
5. Do not connect the PV modules directly to the loads such
as motor since the variation of the output power depending
on the solar irradiation causes damage for the connected
motor.
1: In the case of a brushless motor, the lock function
becomes active and the hall IC is most likely to be
damaged.
2: In the case of a brush type motor, the coil is most likely
to be damaged.
6. In case of snow build-up, snow would slide easier on the
smooth surface of the module than other parts of the roof.
Snow may suddenly slide, fall off the roof and hit nearby
objects/areas. Take preventive measures (e.g. snow
stopper) when there is possible risk such case would cause
an injury or a damage.
GENERAL SAFETY
1. Consult local codes and other applicable laws concerning
required permits on regulations for installation and
inspection requirements.
2. Before installing a PV module, contact appropriate
authorities to determine permit, installation and inspection
requirements that should be followed.
3. Install PV modules and ground frames in accordance with
applicable rules and regulations.
4. PV modules should be installed and maintained by
qualified personnel. Only installer/servicer personnel
should have access to the PV module installation site.
5. No matter where the PV modules are installed, either roof
mounted construction or any other type of structures above
the ground, appropriate safety practices should be followed
and required safety equipment should be used in order to
avoid possible safety hazards. Note that the installation of
some PV modules on roofs may require the addition of
fireproofing, depending on local building/fire codes.
6. In the case that the PV modules are non-integral type, the
module is to be mounted over a fire resistant roof.
7. Use PV modules with the same cell size within series.
8. Follow all safety precautions of other components that are
used in the system.
9. 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.
10. 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. Shading causes drop i n generated power
and/or operation failure of the PV modules.
11. Do not clean the glass surface with chemicals. Do not let
water collect on the glass surface for a long time. This
creates a risk of white efflorescence (glass disease) which
may result in the deterioration of energy generation.
12. Do not install the PV module horizontally. It may cause dirt
or white efflorescence (glass disease) due to water.
13. Do not cover the water drain gap of the frame. There is a
risk of frost damage when the frame is filled with water
cumulation.
14. If there is a risk of sliding snow, an appropriate measure
has to be taken so that PV module frames on lower edge
of PV modules will not be damaged.
15. Do not expose PV module to sunlight concentrated with
mirrors, lenses or similar means.
16. Turn off inverters and circuit breakers immediately, should
a problem occur.
17. In case the glass surface of a PV module is broken, wear
goggles and tape the glass to keep the broken pieces in
place.
18. 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 so PV cells are completely shaded.
19. 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
SIM426-005
reverse current flow. The current may easily flow in a
reverse direction.
20. Keep modules away from children.
HANDLING SAFETY
1. Do not cause an excessive load on the surface of PV
module or twist the frame. The glass surface can easily
break.
2. Do not stand or step on the PV module. The surface glass
of PV module is slippery.
3. Do not hit or put excessive load on the glass or back sheet.
The PV cell is very thin and can be easily broken.
4. Do not scratch or hit at the back sheet. The back sheet is
vulnerable.
5. Do not damage the junction box or do not pull the cables.
The junction box can crack and break.
6. Never touch junction 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 wear rubber gloves when handling the
wires to avoid electric shock.
7. 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.
8. Do not pull the output cable excessively. The output cable
may unplug and cause electricity leakage or shock.
9. Do not drill holes in the frame. It may compromise the
frame strength and cause corrosion.
10. 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.
11. Do not touch the PV module with bare hands. The frame of
PV module has sharp edges and may cause injury.
12. Do not drop PV module or allow objects to fall down on the
PV module.
13. Do not concentrate sunlight artificially on the PV module.
14. Do not hold the PV module on one side. The frame may
bend or twist. Hold the PV module at opposite sides.
15. Do not touch the anti-reflective coated glass since finger
prints and/or stains can be easily left on the glass surface.
INSTALLATION SAFETY
1. Always wear protective head gear, insulating gloves and
safety shoes (with rubber soles). Do not wear metallic
jewellery to prevent electric shock during installation.
2. Keep the PV module packed in the carton until installation.
3. Do not touch the PV module unnecessarily during
installation. The glass surface and the frames get hot.
There is a risk of burn, or electric shock.
4. Do not work under rain, snow or windy conditions.
5. Use dry insulated tools.
6. Do not drop tools or hard objects on PV modules
7. When working at heights, wear a safety belt and take care
not to drop any items (e.g., PV module or tools).
8. Make sure flammable gases are not generated near the
installation site.
9. Completely cover the PV module surface with an opaque
material during PV module installation and wiring.
10. Plug in the connector tight and ensure the wiring work.
Make sure that the connectors have been locked by a
snap-in latch. Any treatments over the connectors which
may allow to unlock the snap-in latch shall not be done.
11. Due to the risk of electrical shock, do not perform any work
if the terminals of PV module are wet.
12. Do not touch the junction 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.
13. Do not unplug the connector if the system circuit is
connected to a load.
14. Do not stomp on the glass at work. There is a risk of injury
or electric shock if glass is broken.
15. Do not work alone (always work as a team of 2 or more
people).
16. Do not damage the back sheet of PV modules when setting
the equipotential bonding by bolts.
17. Do not damage the surrounding PV modules or mounting
structure when replacing a PV module.
18. Bind cables by the insulation locks. Drooping down of
cables from the junction box could possibly cause various
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SIM201-004
problems such as animal biting, electricity leakage in
puddle.
19. 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.
20. Cables shall be located so that they will not be exposed to
direct sunlight after installation to prevent degradation of
cables.
21. If batteries are used with modules, follow safety
precautions of the battery manufacturer.
22. In case of extreme snow build-up, t he weight of the snow
may cause the module’s frame to deform. Take appropriate
preventive measures to minimize any possible resulting
damage.
4. SITE SELECTION
In most applications, the PV modules should be installed in a
location where there is no shading throughout the year. In the
Northern Hemisphere, the PV modules should typically face
south, and in the Southern Hemisphere, the PV modules should
typically face north.
Please make sure that there are no obstructions in the
surroundings of the site of installation. 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/corrosive gas environment/ Small islands or desert
areas.
The results of the ammonia test and the salt-mist-corrosion test
on the modules, carried out under such strict test conditions,
should be disclosed for reference purposes only. The decision
on whether the modules are suitable and compatible for each
installation field will depend on the user’s judgement and
responsibility.
5. TILT ANGLE
The tilt angle is the measurement between the PV module and
a horizontal ground surface. The PV module generates the
maximum output power when it faces the sun directly.
5 degrees or more is recommended for the tilt angle of the PV
module for the maintenance. (See 9. Maintenance)
For the standalone systems with a battery where the PV
modules are attached to a permanent structure, the tilt angle of
the PV modules should be determined to optimize the
performance when the sunlight is the scarcest. In general, if the
electric power generation is adequate when the sunlight is the
scarcest, then the angle chosen should be adequate during the
rest of the year. For grid-connected installations where the PV
modules are attached to a permanent structure, it is
recommended to tilt the PV module at the angle equal to the
latitude of the installation site so that the power generation from
the PV module will be optimum throughout the year.
6. WIRING
To ensure proper system operation and to maintain your
guaranty, observe the correct cable connection polarity (Figures
1 & 2) 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 1 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 2 shows modules
connected in parallel.
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7. GROUNDING
The frame grounding must consider the local requirement and
regulation at the installation site. When grounding is required,
please refer to below example connection (Figure 3). 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
as described below.
You can use a hole with the appropriate symbol for
equipotential bonding on the side frame for either a bolt, nut and
washer grounding the module to the frame, a ground lug
fastened by bolt or screw, or appropriate screw (hardware not
provided). An example of acceptable ground connection using
a bolt, nut and washer retaining a ground lug is shown in figure
3. 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 local requirement of local and
regulation at the site of installation.
8. MOUNTING
Please make sure that all the information described in the
installation manual is still valid and proper for your installation.
The mounting method has been verified by SHARP and NOT
CERTIFIED by a third party organization.
The approved way to mount Sharp PV modules to a support
structure is described in this INSTALLATION MANUAL.
Although Sharp does not specify or warrant frame clips or
clamps, using frame clips (not provided) or clamps (not
provided) is possible when they are designed for PV modules
and with minimum dimensions on the sides of the module in
accordance with the instructions and drawings provided. If using
frame clips or clamps, the modules should be fixed rigidly and
there shall be no damage to the modules by deforming mounting
structure against design load.
The Sharp module guaranty may be void if customer-selected
frame clips are improper or inadequate for module properties
(including strength or material) or installation. Note that if metal
clips are used, there must be a path to ground from the clips,
(for instance, using star washers in the clip hardware set).
Please review the descriptions and drawings carefully; not
mounting the modules according to one of these methods may
void your guaranty. These mounting methods are designed to
allow module loading of 2400Pa. The module has passed a
snow load test of 5400Pa according to IEC61215. Support
structures that PV modules are mounted on should be rigid.
Sharp PV modules are designed to ensure optimal electrical
performance under the condition that they are mounted on rigid
support structures. Deformation of support structure may
damage PV module with its electric performance.
When mounting the module on structure, ensure that no corner
has a displacement of more than 2mm per every 1000mm of the
diagonal.
9. MAINTENANCE
The modules are designed for long life and require very little
maintenance. If the angle of the PV module is 5 degrees or more,
normal rainfall is sufficient to keep the module glass surface
clean under most weather conditions. If dirt build-up becomes
excessive, clean the glass surface preferably with water only, or
with wet soft sponge or cloth in case to remove stubborn dirt. If
cleaning the back of the module is required, take utmost care
not to damage the back side materials. In order to ensure the
operation of the system, check the connection of wiring and the
state of the jacket of wires occasionally.
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Table-1. Electrical characteristics (at STC)
Model
name
Maximum
Power
(Pmax)
Tolerance
Open-Curcuit
Voltage
(Voc)
Short-Circuit
Current
(Isc)
Voltage at point
of max. Power
(Vmpp)
Current at point
of max. Power
(Impp)
Maximum
system voltage
Over-Current
Protection
Application
Class
Maximum series
configuration(*)
ND-AK275 275W +5%/-0% 38.5V 9.38A 31.4V 8.76A 1,000V 15A A 21
ND-AK270 270W +5%/-0% 38.3V 9.29A 31.2V 8.65A 1,000V 15A A 21
* The maximum series number of modules depends on the local conditions. These values are calculated under the condition of Voc at -40 °C.
Figure1. Clips (Clamps) requirement
1) Clip: Al alloy, 3mm Min. thickness
2) Catch length (50mm Min.)
3) Covering depth (7mm Min. on the frame)
4) Supporting depth (10mm Min.)
5) Frame
(applicable to all frame sections)
6) Array rail
(applicable to parallel or crossed mounting)
Figure2. Clamping on longer Frame
NU-SA***: 207mm (8.2in) < e < 330mm (12.9in)
NU-SC***: 250mm (9.9in) < e < 400mm (15.7in)
207 mm < e < 330mm
e : span from module corner to clip center
Figure2. Clamping on longer Frame
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1. INSTALLATION
The mounting method has been verified by SHARP and NOT
CERTIFIED by a third party organization. Please review the
descriptions and drawings carefully; not mounting the modules
according to one of these methods may void your guaranty.
These mounting methods are designed to allow module loading
of 2400Pa.
Mounting Using Clips: Clamping on Longer Frame (Figure2)
The modules can be mounted using clips (clamps) designed for solar
modules as defined in the following Figures. Note that the mounting clips
should meet the required dimensions as defined in the Figure1. Note that
the CLIP CENTER POSITION (e) is important as specified in the Figure2.
The module must be supported on the array system and should overlap
the array rail by at least 10mm. The array rails (see pointillist image, row
or vertical row) must support the bottom of the frames and must be
continuous piece (no breaks in the rail).
2. ELECTRICAL INSTALLATION INSTRUCTION
CABLE requirement
Conductor size: 4.0mm2,
Cable type: XLPE cable (H1Z2Z2-K cable)
Maximum DC voltage: 1.5kV
Rating temperature: -40°C to +90°C,
Rated electrical characteristics of Isc, Voc, are within ±10 percent of the indicated values and +5/-0 percent of Pmax (power measurement tolerance: ± 3%),
under STC (standard test conditions) (irradiance of 1000 W/m2, AM 1.5 spectrum, and a cell temperature of 25 °C (77°F)).
INSTALLATION MANUAL -PHOTOVOLTAIC MODULES-
Module configuration (Recommend)
# Maximum series configuration: please refer to Table-1
(This value is calculated under the condition of Voc at -40 °C.)
# Maximum parallel configuration: (Parallel connection of each
string shall be conducted with following two options. Any other
parallel connections are prohibited.)
a) Case of using the diodes; 1 diode per maximum 2 parallel
strings (Connect a diode or more in series for every string or
every 2 parallel strings for protection of module from reverse
current over load.)
b) Case of using the fuses; 1 fuse per every string (Connect a
fuse for every single string for protection of module from reverse
current over load.)
CONNECTOR requirement
The module shall be mated to the same connectors;
Type: MC4
Brand: Staubli Electrical Connectors
3. WARNING
Keep all MODULES and electriacal
CONNECTORS clean & dry before
installation.
4. Disposal
ELECTRICAL OUTPUT AND THERMAL CHARACTERISTICS
Dispose photovoltaic modules properly.
For Information about the proper disposal,
contact your local recycling site
Under normal conditions, a photovoltaic module is likely to experience conditions that produce more current and/or voltage than
reported at Standard Test Conditions. Ac cordingly, 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.
Application Class
This module is rated as “Application class A” according to
IEC61730.
“Application class A” means: General access, hazardous
voltage, hazardous power applications; Modules rated for
use in this application class may be used in systems
operating at greater than 50V DC or 240W, where general
contact access is anticipated. Modules qualified as
“Application class A” according to IEC 61730 are
considered to meet the requirements for safety class II.
FIRE RATING
This module is rated as “Fire safety class C” according to
IEC61730.
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