SG25 30 33 36 40 50CX-P2-User-Manual
SG25 30 33 36 40 50CX-P2-User-Manual
SG25 30 33 36 40 50CX-P2-User-Manual
PV Grid-Connected Inverter
SG25CX-P2 /SG30CX-P2 / SG33CX-P2 / SG36CX-P2 /
SG40CX-P2/ SG50CX-P2
SG25CX-P2
/SG30CX-P2 / SG33CX-P2 / SG36CX-
P2 / SG40CX-P2/ SG50CX-P2PV
Grid-Connected InverterUser
ManualSG25_30_33_36_40_50CX-
P2-UEN-Ver12-202207
SG25_30_33_36_40_50CX-P2-UEN-Ver12-202207
All Rights Reserved
I
About This Manual
The manual mainly contains the product information, as well as guidelines for installation,
operation, and maintenance. The manual does not include complete information about the
photovoltaic (PV) system. Readers can get additional information at www.sungrowpower.
com or on the webpage of the respective component manufacturer.
Validity
This manual is valid for the following model of low-power grid-connected PV string inverters:
• SG25CX-P2
• SG30CX-P2
• SG33CX-P2
• SG36CX-P2
• SG40CX-P2
• SG50CX-P2
• Know electronic, electrical wiring and mechanical expertise, and be familiar with electri-
cal and mechanical schematics.
• Have received professional training related to the installation and commissioning of elec-
trical equipment.
• Be able to quickly respond to hazards or emergencies that occur during installation and
commissioning.
• Be familiar with local standards and relevant safety regulations of electrical systems.
• Read this manual thoroughly and understand the safety instructions related to
operations.
How to Use This Manual
Please read this manual carefully before using the product and keep it properly at a place
for easy access.
All contents, pictures, marks, and symbols in this manual are owned by SUNGROW. No part
of this document may be reprinted by the non-internal staff of SUNGROW without written
authorization.
II
Contents of this manual may be periodically updated or revised, and the actual product pur-
chased shall prevail. Users can obtain the latest manual from support.sungrowpower.com
or sales channels.
Symbols
This manual contains important safety instructions, which are highlighted with the following
symbols, to ensure personal and property safety during usage, or to help optimize the prod-
uct performance in an efficient way.
Please carefully understand the meaning of these warning symbols to better use the manual.
Indicates high-risk potential hazards that, if not avoided, may lead to death or seri-
ous injury.
Indicates moderate-risk potential hazards that, if not avoided, may lead to death or
serious injury.
Indicates low-risk potential hazards that, if not avoided, may lead to minor or mod-
erate injury.
Indicates potential risks that, if not avoided, may lead to device malfunctions or fi-
nancial losses.
III
Contents
All Rights Reserved .....................................................................................................I
About This Manual......................................................................................................II
1 Safety Instructions ............................................................................................1
1.1 Unpacking and Inspection ...............................................................................1
1.2 Installation Safety ...........................................................................................1
1.3 Electrical Connection Safety............................................................................2
1.4 Operation Safety ............................................................................................3
1.5 Maintenance Safety ........................................................................................4
1.6 Disposal Safety ..............................................................................................4
2 Product Description ..........................................................................................5
2.1 System Introduction ........................................................................................5
2.2 Product Introduction........................................................................................6
2.3 Symbols on the Product ..................................................................................8
2.4 LED Indicator .................................................................................................9
2.5 Circuit Diagram ............................................................................................10
2.6 Function Description .....................................................................................10
3 Unpacking and Storage .................................................................................13
3.1 Unpacking and Inspection .............................................................................13
3.2 Inverter Storage ...........................................................................................13
4 Mechanical Mounting .....................................................................................15
4.1 Safety during Mounting .................................................................................15
4.2 Location Requirements .................................................................................15
4.2.1 Environment Requirements..................................................................16
4.2.2 Carrier Requirements ..........................................................................16
4.2.3 Angle Requirements............................................................................17
4.2.4 Clearance Requirements .....................................................................18
4.3 Installation Tools...........................................................................................20
4.4 Moving the Inverter .......................................................................................21
4.5 Installing the mounting-bracket ......................................................................22
4.5.1 Bracket-Mounted Installation................................................................22
4.5.2 Wall-Mounted Installation.....................................................................23
V
4.5.3 Pole Installation ..................................................................................24
4.6 Installing the Inverter.....................................................................................25
5 Electrical Connection .....................................................................................27
5.1 Safety Instructions ........................................................................................27
5.2 Terminal Description .....................................................................................28
5.3 Electrical Connection Overview .....................................................................29
5.4 Crimp OT / DT terminal .................................................................................32
5.5 External Grounding Connection .....................................................................33
5.5.1 External Grounding Requirements........................................................33
5.5.2 Connection Procedure.........................................................................34
5.6 AC Cable Connection ...................................................................................34
5.6.1 AC Side Requirements ........................................................................34
5.6.2 Requirements for OT/DT Terminal ........................................................36
5.6.3 Connection Procedure.........................................................................36
5.7 DC Cable Connection ...................................................................................40
5.7.1 PV Input Configuration ........................................................................41
5.7.2 Assembling the PV Connectors ............................................................42
5.7.3 Installing the PV Connector..................................................................43
5.8 Communication Connection ..........................................................................44
5.8.1 Wireless Communication Module Connection (optional) .........................44
5.8.2 WiNet-S Connection (optional) .............................................................45
5.8.3 RS485 Connection ..............................................................................47
5.8.4 Smart Energy Meter Connection ..........................................................50
5.8.5 Dry Contact Connection.......................................................................51
5.8.6 DRM Connection.................................................................................52
6 Commissioning ...............................................................................................56
6.1 Inspection before Commissioning ..................................................................56
6.2 Commissioning Procedure ............................................................................56
7 iSolarCloud App ..............................................................................................58
7.1 Brief Introduction ..........................................................................................58
7.2 Installing the App ..........................................................................................58
7.3 Login ...........................................................................................................59
7.3.1 Requirements .....................................................................................59
7.3.2 Login Procedure .................................................................................59
7.4 Function Overview........................................................................................64
7.5 Home page ..................................................................................................64
VI
7.6 Run Information............................................................................................66
7.7 Records .......................................................................................................68
7.8 More............................................................................................................70
7.8.1 System Parameters.............................................................................70
7.8.2 Operation Parameters .........................................................................71
7.8.3 Power Regulation Parameters..............................................................73
7.8.4 Communication Parameters.................................................................78
7.8.5 Firmware Update ................................................................................78
7.8.6 Password Changing ............................................................................79
8 System Decommissioning ............................................................................81
8.1 Disconnecting the Inverter.............................................................................81
8.2 Dismantling the Inverter ................................................................................81
8.3 Disposal of the Inverter .................................................................................82
9 Troubleshooting and Maintenance ..............................................................83
9.1 Troubleshooting ...........................................................................................83
9.2 Maintenance ................................................................................................91
9.2.1 Maintenance Notices...........................................................................91
9.2.2 Routine Maintenance ..........................................................................92
9.2.3 Cleaning Air Inlet and Outlet.................................................................93
9.2.4 Fan Maintenance ................................................................................93
10 Appendix .......................................................................................................95
10.1 Technical Data............................................................................................95
10.2 Wring Distance of DI Dry Contact............................................................... 102
10.3 Quality Assurance .................................................................................... 104
10.4 Contact Information .................................................................................. 104
VII
1 Safety Instructions
When installing, commissioning, operating, and maintaining the product, strictly observe the
labels on the product and the safety requirements in the manual. Incorrect operation or work
may cause:
• The safety instructions in this manual are only supplements and cannot cover
all the precautions that should be followed. Perform operations considering ac-
tual onsite conditions.
• SUNGROW shall not be held liable for any damage caused by violation of gen-
eral safety operation requirements, general safety standards, or any safety in-
struction in this manual.
• When installing, operating, and maintaining the product, comply with local laws
and regulations. The safety precautions in this manual are only supplements
to local laws and regulations.
After receiving the product, check whether the appearance and structural parts of
the device are damaged, and check whether the packing list is consistent with the
actual ordered product. If there are problems with the above inspection items, do
not install the device and contact SUNGROW in time.
1
1 Safety Instructions User Manual
• When moving the product, be aware of the product weight and keep the balance
to prevent it from tilting or falling.
Before operating the product, must check and ensure that tools to be used have
been maintained regularly.
Before electrical connections, please make sure that the inverter is not damaged,
otherwise it may cause danger!
Before electrical connections, please make sure that the inverter switch and all
switches connected to the inverter are set to "OFF", otherwise electric shock may
occur!
The PV string will generate lethal high voltage when exposed to sunlight.
• Must ensure that cables are voltage-free with a measuring instrument before
touching DC cables.
• The inverter must not be connected to a PV string that requires positive or neg-
ative grounding.
• Note and observe the warning labels on the product, and perform operations
strictly following the safety instructions.
• Respect all safety instructions listed in this manual and other pertinent
documents.
2
User Manual 1 Safety Instructions
Damage to the product caused by incorrect wiring is not covered by the warranty.
• All cables used in the PV generation system must be firmly attached, properly
insulated, and adequately dimensioned.
Check the positive and negative polarity of the PV strings, and connect the PV con-
nectors to corresponding terminals only after ensuring polarity correctness.
During the installation and operation of the inverter, please ensure that the positive
or negative poles of PV strings do not short-circuit to the ground. Otherwise, an
AC or DC short-circuit may occur, resulting in equipment damage. The damage
caused by this is not covered by the warranty.
Comply with the safety instructions related to PV strings and the regulations re-
lated to the local grid.
• When the inverter is running, it is strictly forbidden to plug and unplug any con-
nector on the inverter.
• When the inverter is running, do not touch any wiring terminal of the inverter.
Otherwise, electric shock may occur.
• When the inverter is running, do not disassemble any parts of the inverter. Oth-
erwise, electric shock may occur.
• When the inverter is running, it is strictly forbidden to touch any hot parts of the
inverter (such as the heat sink). Otherwise, it may cause burns.
• If the inverter is equipped with a DC switch, do not operate it when the inverter
is running. Otherwise, device damage or personal injury may occur.
3
1 Safety Instructions User Manual
• Before any service work, first disconnect the grid-side AC circuit breaker and
check the inverter status. If the inverter indicator is off, please wait until night to
disconnect the DC switch. If the inverter indicator is on, directly disconnect the
DC switch.
• After the inverter is powered off for 15 minutes, measure the voltage and cur-
rent with professional instrument. Only when there is no voltage nor current
can operators who wear protective equipment operate and maintain the inverter.
• Even if the inverter is shut down, it may still be hot and cause burns. Wear pro-
tective gloves before operating the inverter after it cools down.
Touching the power grid or the contact points and terminals on the inverter con-
nected to the power grid may lead to electric shock!
• The power grid side may generate voltage. Always use a standard voltmeter to
ensure that there is no voltage before touching.
To avoid the risk of electric shock, do not perform any other maintenance opera-
tions beyond those described in this manual. If necessary, contact your distributor
first. If the problem persists, contact SUNGROW. Otherwise, the losses caused is
not covered by the warranty.
Please scrap the product in accordance with relevant local regulations and stand-
ards to avoid property losses or casualties.
4
2 Product Description
The inverter must not be connected to a PV string that requires positive or negative
grounding.
Do not connect any local load between the inverter and the AC circuit breaker.
5
2 Product Description User Manual
Appearance
The following figure shows the appearance of the inverter.
6
User Manual 2 Product Description
The image shown here is for reference only. The actual product received may differ.
Dimensions
The following figure shows the dimensions of the inverter.
7
2 Product Description User Manual
Model Weight
SG25/30/33CX-P2 38 kg
SG36/40CX-P2 40 kg
SG50CX-P2 41 kg
Symbol Explanation
CE mark of conformity.
EU/EEA Importer.
UKCA mark of conformity.
The height of the label should not exceed 5mm.
Disconnect the inverter from all the external power sources be-
fore maintenance!
8
User Manual 2 Product Description
Symbol Explanation
Danger to life due to high voltages!
Do not touch live parts for 15 minutes after disconnection from
the power sources.
Only qualified personnel can open and maintain the inverter.
* The table shown here is for reference only. The actual product received may differ.
The LED indicator on the front of the inverter indicates the working state of the inverter.
Gray
9
2 Product Description User Manual
Voltage may still be present in AC side circuits after the indicator is off. Pay atten-
tion to the electricity safety during operating.
• The MPPT is utilized for DC input to ensure the maximum power from the PV array at dif-
ferent PV input conditions.
• The inverter circuit converts the DC power into AC power and feeds it to loads(if there
are) or utility grid through the AC terminal.
• The protection circuit ensures the safe operation of the device and personal safety.
10
User Manual 2 Product Description
The inverter can be connected to communication devices via either of the two interfaces.
When communication is established between the inverter and the communication devices,
users can view inverter information or set inverter parameters, such as running parameter
and protection parameter, through the iSolarCloud.
Protection Function
The protective functions are integrated in the inverter, including anti-island protection, DC re-
versed polarity protection, AC short circuit protection, leakage current protection, etc.
Ripple Control
The inverter provides terminals (DRM) for connecting to a Ripple Control Receiver (RCR).
After the connection, the grid dispatching center issues regulation instructions via dry con-
tact (DI). The inverter can control power output according to the local preset instructions.
PID recovery
The PID effect (Potential Induced Degradation) of PV modules will cause serious damage to
generated output and yield, which can be avoided or recovered by PID recovery function.
• For positive voltage scheme, after the PID is enabled, the voltage to ground of all PV
strings is greater than 0, and therefore the PV string-to-ground voltage is a positive value.
• For negative voltage scheme, after the PID is enabled, the voltage to ground of all PV
strings is lower than 0, and therefore the PV string-to-ground voltage is a negative value.
11
2 Product Description User Manual
• Before enabling the PID recovery function, make sure the voltage polarity of the
PV modules to ground meets requirement. If there are any questions, contact
the PV module manufacturer or read the corresponding user manual.
• PID recovery function and reactive power generation at night cannot be enabled
at the same time.
• If the voltage scheme for the PID protection/recovery function does not meet
the requirement of corresponding PV modules, the PID will not work as ex-
pected or even damage the PV modules.
• When the inverter is in the PID recovery state (the indicator blinks blue once at
long intervals and blinks at short intervals for three times), disable the PID re-
covery in the iSolarCloud App before manually powering on and maintaining
the inverter.
AFCI Function
• AFCI activation
This function can be enabled to detect whether arc occurs in the DC circuit of the inverter.
• AFCI self-test
This function is intended to detect whether the AFCI function of the inverter is normal.
When the inverter detects the AFCI alarm, it stops working. Clear the AFCI alarm so that
the inverter can restart the detection.
12
3 Unpacking and Storage
The product is thoroughly tested and strictly inspected before delivery. Nonetheless, dam-
age may still occur during shipping. For this reason, please conduct a thorough inspection
after receiving the product.
• Check the scope of delivery for completeness according to the packing list.
After receiving the product, check whether the appearance and structural parts of
the device are damaged, and check whether the packing list is consistent with the
actual ordered product. If there are problems with the above inspection items, do
not install the device and contact your distributor first. If the problem persists, con-
tact SUNGROW in time.
If any tool is used for unpacking, be careful not to damage the product.
• Store the inverter in the original packing case with the desiccant inside.
• The storage temperature must be always between -40℃ and +70℃, and the storage rel-
ative humidity must be always between 0 and 95 %, non-condensing.
• In case of stacking storage, the number of stacking layers should never exceed the limit
marked on the outer side of the packing case.
• If the inverter needs to be transported again, pack it strictly before loading and transport-
ing it.
13
3 Unpacking and Storage User Manual
• Do not store the inverter in places susceptible to direct sunlight, rain, and strong electric
field.
• Do not place the inverter in places with items that may affect or damage the inverter.
• Store the inverter in a clean and dry place to prevent dust and water vapor from eroding.
• Do not store the inverter in places with corrosive substances or susceptible to rodents
and insects.
• Carry out periodic inspections. Inspection shall be conducted at least once every six
months. If any insect or rodent bites are found, replace the packaging materials in time.
• If the inverter has been stored for more than a year, inspection and testing by professio-
nals are required before it can be put into operation.
Please store the inverter according to the storage requirements. Product damage
caused by failure to meet the storage requirements is not covered by the warranty.
14
4 Mechanical Mounting
• Do not install the inverter in an environment with flammable and explosive ob-
jects or smoke.
• When moving the inverter, be aware of its weight and keep the balance to pre-
vent it from tilting or falling.
• The bottom terminals and interfaces of the inverter cannot directly contact the
ground or other supports. The inverter cannot be directly placed on the ground.
Select an optimal mounting location for safe operation, long service life and expected
performance.
• The inverter with protection rating IP66 can be installed both indoors and outdoors.
• Install the inverter at a place convenient for electrical connection, operation, and
maintenance.
15
4 Mechanical Mounting User Manual
• The ambient temperature and relative humidity must meet the following requirements.
• Do not install the inverter outdoors in areas with high salinity, which mainly refer to the
areas within 500 m away from the coast. The deposition of salt fog varies largely with
nearby seawater characteristics, sea wind, precipitation, relative humidity, terrain, and
forest coverage.
• Inverters free from direct sunlight, direct rain and snow have longer service life. Consider
sheltered places as the installation location.
• The inverter generates noise during operation and is not recommended to be installed in
living areas.
The mounting structure where the inverter is installed must comply with local/national stand-
ards and guidelines. Ensure that the installation surface is solid enough to bear four times
the weight of the inverter and is suitable for the dimensions of the inverter (e.g. cement walls,
plasterboard walls, etc.).
16
User Manual 4 Mechanical Mounting
Install the inverter vertically or at the maximum allowable rear tilt angle. Do not install the in-
verter horizontally, forward, excessively backward, sideways, or upside down.
Inverters in floating plants cannot be installed at a back tilt.
Take the following items into account when designing the bracket scheme:
• Consider onsite climate conditions and take anti-snow and anti-rain measures if
necessary.
17
4 Mechanical Mounting User Manual
• Ensure that the waterproof connectors are at least 300mm higher than the ground
surface.
• Bind the cables at the positions 300~350mm away from the DC connector, AC water-
proof terminal, and communication waterproof terminal.
• The various waterproof terminals should be tightened in accordance with the torque re-
quirements in this manual to ensure that they are tight and sealed.
Reserve enough clearance around the inverter to ensure sufficient space for heat
dissipation.
*When this distance is less than the distance shown, lift the inverter off the stand or wall be-
fore maintaining fans.
18
User Manual 4 Mechanical Mounting
The distance from the bottom of the inverter to the ground is determined according
to the bending radius of the selected AC cable and the installation environment,
and the following requirements should be met:
• The distance from the bottom of the inverter to the ground should be ≥ 650mm.
• The AC cable should be connected to the AC terminal vertically, and the length
of the vertical cable should be ≥ 200mm.
Back-to-Back Installation
When installing inverters back-to-back, the distance between every two inverters should be
at least 200 mm.
Add a baffle between the two inverters to form a heat dissipation channel. The baffle plate
should be placed horizontally between two inverters and should not block the air outlet of
inverters.
19
4 Mechanical Mounting User Manual
Installation tools include but are not limited to the following recommended ones. If necessary,
use other auxiliary tools on site.
20
User Manual 4 Mechanical Mounting
- -
Before installation, remove the inverter from the packing case and move it to the installation
site. Follow the instructions below as you move the inverter:
Lift and move the inverter to the destination by using the side handles and bottom edge.
21
4 Mechanical Mounting User Manual
• Attention must be paid to the center of gravity of the inverter to avoid tilting dur-
ing handling.
• Placing the inverter directly on a hard ground may cause damage to its metal
enclosure. Protective materials such as sponge pad or foam cushion should be
placed underneath the inverter.
• Move the inverter by holding the handles on it. Do not move the inverter by
holding the terminals.
Tool preparation
Name Specification
Marker —
Level -
Hammer drill Bit: φ12
Wrench Inner diameter: 16mm
Material preparation
step 1 Mark and drill holes in one steel u-channel according to the dimensions shown in the figure
below. Two steel u-channels should be spaced 180 mm - 260 mm apart.
22
User Manual 4 Mechanical Mounting
- - End
Tool preparation
Name Specification
Maker —
Level -
Hammer drill Bit: φ12
Wrench Inner diameter: 16mm
Material preparation
step 1 Place the mounting-bracket at the installation place, adjust the angle with a level, and mark
the location of the drilled holes.
step 2 Drill holes with a hammer drill. Clean up the holes, stuff the expansion bolts into the holes,
and fix them with a rubber mallet. Use a wrench to tighten the nut to fix the end of the bolt,
take off the nut, spring washer and flat washer for spare.
23
4 Mechanical Mounting User Manual
- - End
Tool preparation
Name Specification
Marker —
Level -
Hammer drill* Bit: φ12
Wrench Inner diameter: 16mm
*Check if tools of other specifications are needed according to the bolts of the matching
clamps.
Material preparation
Please skip this step if the inverter is to be installed on a concrete pole, PV brack-
et, etc. through pole-mounting.
24
User Manual 4 Mechanical Mounting
step 2 Mark and drill holes in steel u-channels according to the dimensions shown in the figure be-
low. Two steel u-channels should be spaced 180 mm - 260 mm apart.
step 4 Secure the steel u-channels to the pole with bolts and clamps.
- - End
Tool preparation
Name Specification
Phillips screwdriver M5
Material preparation
25
4 Mechanical Mounting User Manual
step 2 Lift the inverter onto the mounting-bracket and make sure the mounting ears fit well into the
grooves of the mounting-bracket.
- - End
26
5 Electrical Connection
The PV string will generate lethal high voltage when exposed to sunlight.
• Must ensure that cables are voltage-free with a measuring instrument before
touching DC cables.
• Before electrical connections, please make sure that the inverter switch and all
switches connected to the inverter are set to "OFF", otherwise electric shock
may occur!
• Ensure that the inverter is undamaged and all cables are voltage free before
performing electrical work.
• Do not close the AC circuit breaker until the electrical connection is complete.
Damage to the product caused by incorrect wiring is not covered by the warranty.
• All cables used in the PV generation system must be firmly attached, properly
insulated, and adequately dimensioned.
All electrical connections must comply with local and national / regional electrical
standards.
• Cables used by the user shall comply with the requirements of local laws and
regulations.
• Only with the permission of the national / regional grid department, the inverter
can be connected to the grid.
27
5 Electrical Connection User Manual
• All vacant terminals must be covered with waterproof covers to prevent affect-
ing the protection rating.
• When the wiring is completed, seal the gap of cable inlet and outlet holes with
fireproof / waterproof materials such as fireproof mud to prevent foreign matter
or moisture from entering and affecting the long-term normal operation of the
inverter.
• Comply with the safety instructions related to PV strings and the regulations re-
lated to the utility grid.
The cable colors in figures in this manual are for reference only. Please select ca-
bles according to local cable standards.
* The image shown here is for reference only. The actual product received may differ.
28
User Manual 5 Electrical Connection
(1) When the inverter is connected to a third-party monitoring device, please confirm which
communication interface is used, and whether it will cause loss of certain functions of the
inverter.
Connecting the inverter to the PV system requires connecting the inverter to the protective
grounding point, to the grid, and to the PV strings.
29
5 Electrical Connection User Manual
Specification
Cable Di-
No. Cable Type
ameter Cross-sectional Area(mm2)
(mm)
Multi-core PV
cable with a
1 DC cable maximum with- 4.7 ~ 6.4 4~6
stand voltage of
1100V
External
Outdoor single- The same as that of the PE wire in
2 grounding /
core copper wire the AC cable
cable
L1,L2,L3,N wire:16~35(SG25/30/
33/36/40CX-P2)
PE wire:16**(SG25/30/33/36/
Outdoor four-
40CX-P2)
core/five-core
L1,L2,L3,N wire:35~50(SG50CX-
copper wire
P2)
PE wire: refer to"table 5-4 PE wire
requirements"(SG50CX-P2)
3 AC cable 18 ~ 38
L1,L2,L3,N wire:25~35(SG25/30/
33/36/40CX-P2)
PE wire:16**(SG25/30/33/36/
Outdoor four-
40CX-P2)
core/five-core
L1,L2,L3,N wire:35~50(SG50CX-
aluminum wire*
P2)
PE wire:refer to"table 5-4 PE wire
requirements"(SG50CX-P2)
30
User Manual 5 Electrical Connection
Specification
Cable Di-
No. Cable Type
ameter Cross-sectional Area(mm2)
(mm)
Shielded twisted
0.5~1
Communi- pair
4 cation CAT 5E outdoor 5.3 ~ 7
cable shielded network /
cable
*A copper to aluminum adapter terminal is required when an aluminum cable is used. For
details, refer to " Aluminium Cable Requirements".
** The specifications are valid only when the phase wire and PE wire use the same material.
If otherwise, ensure that the cross section of the PE wire produces a conductance equivalent
to that of the 16mm2 in the table.
PE wire cross
Note
section
The specifications are valid only when the phase wire and PE wire
S/2
use the same material. If otherwise, ensure that the cross section
(S: Phase wire
of the PE wire produces a conductance equivalent to that of the
cross-section S)
wire specified in the table.
31
5 Electrical Connection User Manual
32
User Manual 5 Electrical Connection
Ensure that the selected terminal can directly contact with the copper bar. If there
are any problems, contact the terminal manufacturer.
Ensure that the copper bar is not in direct contact with the aluminum wire. Other-
wise, electrochemical corrosion may occur, impairing the reliability of electrical
connection.
Electric shock!
• Make sure that the ground cable is connected reliably. Otherwise, it may cause
electric shock.
• Since the inverter is not equipped with a transformer, neither the negative elec-
trode nor the positive electrode of the PV string can be grounded. Otherwise,
the inverter will not operate normally.
• Connect the grounding terminal to the protective grounding point before AC ca-
ble connection, PV string connection, and communication cable connection.
The external protective grounding terminal must meet at least one of the following
requirements.
• The cross-sectional area of the AC side grounding cable is not less than 10
mm2 for copper wire or 16 mm2 for aluminum wire. It is recommended that both
the external protective grounding terminal and the AC side grounding terminal
be reliably grounded.
• If the cross-sectional area of the AC side grounding cable is less than 10 mm2
for copper wire or 16 mm2 for aluminum wire, ensure that both the external pro-
tective grounding terminal and the AC side grounding terminal are reliably
grounded.
The grounding connection can be made by other means if they are in accordance
with the local standards and regulations, and SUNGROW shall not be held liable
for the possible consequences.
All non-current carrying metal parts and device enclosures in the PV power system should
be grounded, for example, brackets of PV modules and inverter enclosure.
33
5 Electrical Connection User Manual
When there is only one inverter in the PV system, connect the external grounding cable to a
nearby grounding point.
When there are multiple inverters in the PV system, connect grounding points of all inverters
and the PV array frames to the equipotential cable (according to the onsite conditions) to im-
plement an equipotential connection.
step 2 Remove the screw on the grounding terminal and fasten the cable with a screwdriver.
The grounding screws have been anchored to the side of the inverter before deliv-
ery, and do not need to be prepared.
There are two grounding terminals. Use one of them to ground the inverter.
- - End
Only with the permission of the local grid department, the inverter can be con-
nected to the grid.
Before connecting the inverter to the grid, ensure the grid voltage and frequency comply with
requirements, for which, refer to "Technical Data". Otherwise, contact the electric power
company for help.
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User Manual 5 Electrical Connection
AC Circuit Breaker
An independent circuit breaker or fuse should be installed on the output side of the inverter
to ensure safe disconnection from the grid.
Recommended rated
Inverter Recommended rated voltage
current
SG25CX-P2 400V 63 A
SG30CX-P2 400V 63 A
SG33CX-P2 400V 80 A
SG36CX-P2 400V 80 A
SG40CX-P2 400V 100 A
SG50CX-P2 400V 125 A
AC circuit breakers should be installed on the output side of the inverter and the
grid side to ensure safe disconnection from the grid.
• Do not connect any local load between the inverter and the AC circuit breaker.
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5 Electrical Connection User Manual
OT / DT terminals (not included in the delivery scope) are required for fixing AC cables to
the terminal block. Purchase the OT / DT terminals according to the following requirements.
OT / DT Terminals of Phase Wire
• Specification: M8
• Specification: M8
step 2 Take out the AC junction box and loosen the swivel nut. Remove the seals and select an ap-
propriate one according to cable outer diameter. Lead the cable through the swivel nut, seal,
and junction box successively.
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User Manual 5 Electrical Connection
step 5 Secure the wires to corresponding terminals. Gently pull the cable backwards to ensure firm
connection.
Observe the terminal layout on the block. Do not connect the phase wires to "PE"
terminal or "N" terminal. Otherwise, unrecoverable damage to the inverter may
follow.
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5 Electrical Connection User Manual
Ensure that the depth L of the socket used is not less than 18mm.
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User Manual 5 Electrical Connection
Ensure that the junction box is properly assembled. Failure to do so may affect the
waterproof performance of the AC side, and the loss caused by this is not covered
by the warranty.
step 7 Gently pull the cable backwards to ensure firm connection, and fasten the swivel nut
clockwise.
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5 Electrical Connection User Manual
- - End
The PV string will generate lethal high voltage when exposed to sunlight.
• Make sure the PV array is well insulated to ground before connecting it to the
inverter.
• Make sure the maximum DC voltage and the maximum short circuit current of
any string never exceed inverter permitted values specified in "Technical Data".
• Check the positive and negative polarity of the PV strings, and connect the PV
connectors to corresponding terminals only after ensuring polarity correctness.
• During the installation and operation of the inverter, please ensure that the posi-
tive or negative electrodes of PV strings do not short-circuit to the ground. Oth-
erwise, an AC or DC short-circuit may occur, resulting in equipment damage.
The damage caused by this is not covered by the warranty.
• If the DC input cables are reversely connected or the positive and negative ter-
minals of different MPPT are shorted to ground at the same time, while the DC
switch is in the "ON" position, do not operate immediately. Otherwise, the inver-
ter may be damaged. Please turn the DC switch to "OFF" and remove the DC
connector to adjust the polarity of the strings when the string current is lower
than 0.5 A.
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User Manual 5 Electrical Connection
• The inverter enters standby state when the input voltage ranges between 1,000
V and 1,100 V. The inverter returns to running state once the voltage returns to
the MPPT operating voltage range, namely, 160 V to 1,000 V.
• Each PV input operates independently and has its own MPPT. In this way, string struc-
tures of each PV input may differ from each other, including PV module type, number of
PV modules in each string, angle of tilt, and installation orientation.
• A maximum of two PV strings can be connected to an MPPT controller. For the best use
of PV power, the type, quantity, tilt, and orientation of PV modules connected to the same
MPPT shall be the same.
Prior to connecting the inverter to PV inputs, the specifications in the following table should
be met:
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5 Electrical Connection User Manual
step 3 Lead the cable through cable gland, and insert the crimp contact into the insulator until it
snaps into place. Gently pull the cable backward to ensure firm connection.
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User Manual 5 Electrical Connection
If the PV polarity is reversed, the inverter will be in a fault or alarm state and will
not operate normally.
- - End
step 2 Check the cable connection of the PV string for polarity correctness and ensure that the
open circuit voltage in any case does not exceed the inverter input limit of 1,100 V.
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5 Electrical Connection User Manual
step 3 Connect the PV connectors to corresponding terminals until there is an audible click.
- - End
Install the wireless communication module to the communication interface with a silk screen
of COM1 at the bottom of the inverter.
*The image shown here is for reference only. The actual product you receive may differ.
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User Manual 5 Electrical Connection
Once the communication module is in use, do not connect the inverter to a 3rd
party data logger at the same time via RS485.
For details on module installation and configuration, refer to the manual delivered
together with the module.
The WiNet-S module supports Ethernet communication and WLAN communication. It is not
recommended to use both communication methods at the same time.
For details, see the quick guide for the WiNet-S module. Scan the following QR code for the
quick guide.
step 1 (Optional) Strip the insulation layer of the communication cable with an Ethernet wire
stripper, and lead the corresponding signal cables out. Insert the stripped communication
cable into the RJ45 plug in the correct order, and crimp it with a crimper.
Skip this step if a standard network cable with RJ45 plug is prepared.
step 2 Unscrew the swivel nut from the communication module and take out the inner sealing ring.
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5 Electrical Connection User Manual
step 4 Thread the network cable through the swivel nut and gasket. Afterwards, route the cable
into the opening of the sealing. Finally, insert the cable through the housing.
step 5 Insert the RJ45 plug into the front plug connector until there is an audible click and tighten
the housing. Install the gasket and fasten the swivel nut.
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User Manual 5 Electrical Connection
step 6 Remove the waterproof lid from the COM1 terminal and install WiNet-S.
- - End
step 2 Install the module. Slightly shake it by hand to determine whether it is installed firmly, as
shown below.
step 3 Refer to the guide delivered with the module for the set-up.
- - End
Where there is only one inverter, the RS485 can be connected to an external device for the
communication, as shown in the following figure.
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5 Electrical Connection User Manual
In case of multiple inverters, all the inverters can be connected via RS485 cables in the
daisy chain manner, as shown in the following figure.
step 3 Remove the seal and lead the cable through the cable gland.
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User Manual 5 Electrical Connection
step 4 Remove the cable jacket and strip the wire insulation.
step 5 Plug the wires into the RS485 terminal according the labels on the bottom of the inverter.
step 6 Pull the wires outward to check whether they are firmly installed.
step 7 Insert the terminal block into the connector until it snaps into place with an audible click.
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- - End
step 2 Insert the COM connector into COM terminal on the bottom of the inverter until there is an
audible click.
- - End
The inverter is equipped with the feed-in power limit function, so as to meet the
requirements of some national standards or grid standards for the output power at the grid
connection point. For the setting of feed-in power limit, refer to the section "7.3.2 Login
Procedure"
Contact SUNGROW to ensure that the Smart Energy Meter model is available
locally.
This section mainly describes the cable connections on the inverter side. Refer to
the quick guide delivered with the Smart Energy Meter for the connections on the
meter side.
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User Manual 5 Electrical Connection
Procedure
For detailed connection description of the Smart Energy Meter cable, refer to the section
"5.8.3 RS485 Connection". Plug the wires into the Meter terminal according the labels on
the bottom of the inverter.
Connection method of the dry contacts is similar to that of the RS485 terminal block.
DI terminal (emergency stop dry contact): the dry contact can be configured to be an
emergency stop contact.
When the DI contact and PGND contact are shorted by external controlled switch (The
external switch can be configured as normally open contact or normally closed contact), the
inverter will immediately stop.
NS terminal: NS Protection is used for German market currently. For plant sized more than
30kVA, inverter NS Protection terminals could be used in daisy chain to external NS
Protection Relay to realize emergency stop when NS Protection Relay change its dry
contact status due to the grid abnormal running status.
NS Protection (including Passive Valid) can be set. When NS Protection is enabled on the
iSolarCloud, the inverters will operate normally when DI contact and PGND contact are
shorted by external controlled switch, and the inverters will emergently stop when DI contact
and PGND contact are disconnected.
When wiring DI dry contacts, ensure that the maximum wiring distance meet the
requirements in "10.2 Wring Distance of DI Dry Contact".
DO terminal (fault output dry contact): The relay can be set to output fault alarms, and
user can configure it to be a normally open contact (COM&NO).
Use LED indicators or other equipment to indicate whether the inverter is in the faulty state.
Devices connected to the relay should comply with related requirements:
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5 Electrical Connection User Manual
For detailed connection description of the DI/DO cable, refer to the section "5.8.3 RS485
Connection". Plug the wires into the DI/DO terminal according the labels on the bottom of
the inverter.
DRM and Ripple Control support only one function at the same time.
DRM
In Australia and New Zealand, the inverter supports the demand response modes as
specified in the standard AS/NZS 4777.
The following figure shows the wiring between the inverter and the external DRED.
Enable the DRM function through the iSolarCloud APP. If there are any problems,
contact your distributor first. If the problem persists, contact SUNGROW.
The DRM function is only applicable to devices for Australia and New Zealand.
Ripple Control
In Germany, the grid company uses the Ripple Control Receiver to convert the grid
dispatching signal and send it as a dry contact signal.
Wiring of the ripple control receiver dry contact cables is shown in the figure below:
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User Manual 5 Electrical Connection
0 0 0 0 None 100%
1 0 0 0 Close S1 100%
0 1 0 0 Close S2 60%
0 0 1 0 Close S3 30%
step 3 Remove the seal and lead the cable through the cable gland.
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5 Electrical Connection User Manual
step 5 Plug the wires into the corresponding terminal according the labels on the bottom of the
inverter.
step 6 Pull the wires outward to check whether they are firmly installed.
step 7 Insert the terminal block into the connector until it snaps into place with an audible click.
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User Manual 5 Electrical Connection
- - End
step 2 Insert the COM connector into COM terminal on the bottom of the inverter until there is an
audible click.
step 3 Pull cables outwards to confirm whether they are fastened firmly.
step 4 Connect the other end to the DRED / Ripple Control Receiver device.
- - End
55
6 Commissioning
• No foreign items, such as tools, are left on the top of the machine or in the junction box (if
there is).
• The AC circuit breaker is selected in accordance with the requirements of this manual
and local standards.
If all of the items mentioned above meet the requirements, proceed as follows to start up the
inverter for the first time.
step 1 Rotate the DC switch of the inverter to the "ON" position, the indicator blinks blue slowly.
The indicator is red if there is no power supply from the grid. Report the grid power
failure (the fault information can be viewed on the iSolarCloud App, see “Records”
for details). The fault is automatically cleared when the AC circuit breaker between
the inverter and the grid is closed.
step 2 Close the AC circuit breaker between the inverter and the grid.
step 3 Install the iSolarCloud App, see "7.2 Installing the App" for details.
step 4 Set initial protection parameters via the iSolarCloud App when the inverter is connected to
the grid for the first time (see Step 4 in "7.3.2 Login Procedure" for details). If the irradiation
and grid conditions meet requirements, the inverter normally operates.
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User Manual 6 Commissioning
step 5 The home page is automatically displayed when the initialization is completed. The indicator
is steady blue, and the inverter is in grid-connected operation.
- - End
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7 iSolarCloud App
The iSolarCloud App can establish communication connection to the inverter via the Blue-
tooth, thereby achieving near-end maintenance on the inverter. Users can use the App to
view basic information, alarms, and events, set parameters, or download logs, etc.
Screenshots in this manual are based on the Android system V2.1.6 , and the ac-
tual interfaces may differ.
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User Manual 7 iSolarCloud App
7.3 Login
7.3.1 Requirements
• The mobile phone is within 5 meters away from the inverter and there are no obstructions
in between.
The inverter can only pair with one phone at a time through Bluetooth.
step 2 Scan the QR code on the side of the inverter for Bluetooth connection. Or tap MANUAL
CONNECTION at the bottom of the interface and select Others, the Bluetooth search inter-
face will automatically appear. Select the inverter to be connected according to the serial
number on the nameplate on the side of the inverter, or tap to scan the QR code on the
side of the inverter for Bluetooth connection. The connection is successfully established if
the LED indicator blinks blue.
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7 iSolarCloud App User Manual
step 3 Enter the identity verification screen after the Bluetooth connection is established.
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User Manual 7 iSolarCloud App
step 4 If the inverter is not initialized, you will enter the quick setting screen of initializing protection
parameter.
The Country/Region must be set to the country where the inverter is installed at.
Otherwise, the inverter may report errors.
step 5 When the country is set to Australia, additionally set the applicable network service provider
and then the grid type. Tap Power Company to select the correct power company.
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7 iSolarCloud App User Manual
The image shown here is for reference only. Refer to the actual interface for the supported
network service providers.
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User Manual 7 iSolarCloud App
step 6 The function of the feed-in limitation is to control the amount of power injected in the grid by
the plant. In some situations,this function is also called as Export limitation or Zero ex-
port. The feed-in limitation function requires the using of Smart Energy Meter. Without the
Smart Energy Meter, the feed-in limitation function will be unavailable.
step 7 After finishing the settings, tap TUNR ON DEVICE at the upper right corner and the device
will be initialized. The App will send start instructions and the device will start and operate.
step 8 If the inverter is initialized, the App automatically turns to its home page.
- - End
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7 iSolarCloud App User Manual
The App provides parameter viewing and setting functions, as shown in the following figure.
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State Description
After being energized, the inverter tracks the PV arrays’ maximum power
Run point (MPP) and converts the DC power into AC power. This is the nor-
mal operation mode.
Stop The inverter is stopped.
The inverter will stop operation by manually “stop” via app. In this way,
Key-stop inverter internal DSP stops. To restart the inverter, manually start via
app.
The inverter enters standby mode when DC side input is insufficient. In
Standby
this mode the inverter will wait within the standby duration.
Initial standby The inverter is in the initial power-on standby state.
Starting The inverter is initializing and synchronizing with the grid.
Warning Warning information is detected.
Derating The inverter derates actively due to environmental factors such as tem-
running perature or altitude
Scheduling The inverter runs according to the scheduling instructions received from
running the monitoring background
If a fault occurs, the inverter will automatically stop operation, and dis-
connect the AC relay. The fault information will be displayed in the app.
Fault
Once the fault is removed in recovery time, the inverter will automatically
resume running.
State Description
PID recovery
The inverters perform PID recovery actively.
running
It is detected that the ISO impedance is abnormal or the PID cannot
PID abnormity
work normally after the PID function being enabled.
If the inverter is running abnormally, the alarm or fault icon will be displayed in the lower
right corner of the inverter icon in power flow chart. The user can tap this icon to enter the
alarm or fault screen to view detailed information and corrective measures.
Tap Run Information on the navigation bar to enter the screen showing running information,
slide the screen upwards to view all detailed information.
Run information includes PV information, inverter information, input and output information,
etc.
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User Manual 7 iSolarCloud App
Classifica-
Parameter Description
tion
PV String n Voltage The input voltage of the nth string
Information String n current The input current of the nth string
Total On-grid Run-
/
ning Time
Daily On-grid Run-
/
ning Time
Negative Voltage to
Inverter DC side negative to ground voltage value
Ground
Voltage between the positive and negative poles
Bus Voltage
of the DC side of the inverter
Inverter
Internal Air
Information /
Temperature
Array Insulation Insulation resistance value of the input side to the
Resistance protection ground
Country Information /
Power Limitation
/
Mode
Reactive Power
/
Mode
Total DC Power DC side total input power
Input MPPT x Voltage The input voltage of the xth MPPT
MPPT x Current The input current of the xth MPPT
Daily Yield /
Monthly Yield /
Annual Yield /
Total Active Power Current active power value of the inverter
Total Reactive Power Current reactive power value of the inverter
Total Apparent
Current apparent power value of the inverter
Power
Output
Total Power Factor Power factor of the AC side of the inverter
Gird Frenquency Frequency of the AC side of the inverter
A-B Line Voltage
B-C Line Voltage Line Voltage
C-A Line Voltage
Phase A Current
Phase Current
Phase B Current
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Classifica-
Parameter Description
tion
Phase C Current
7.7 Records
Tap Records on the navigation bar to enter the screen showing event records, as shown in
the following figure.
Select one of the records in the list and click the record, to view the detailed fault info as
shown in following figure.
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User Manual 7 iSolarCloud App
The App displays power generation records in a variety of forms, including daily power gen-
eration graph, monthly power generation histogram, annual power generation histogram
and total power generation histogram.
Parameter Description
Shows the power output from 5 am to 23 pm in a single day. Each
Power curve point on the curve is the percentage of present power to rated
power.
Daily energy
Shows the power output every day in the present month.
histogram
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7 iSolarCloud App User Manual
Parameter Description
Monthly energy
Shows the power output every month in a year.
histogram
Annual energy
Shows the power output every year.
histogram
Tap the time bar on the top of the screen to select a time segment and view the correspond-
ing power curve.
Swipe left to check the power yields histogram.
Event Record
Tap Event Record to view event record list.
7.8 More
Tap More on the navigation bar to enter the corresponding screen, as shown in the following
figure.
Tap Settings→System Parameters to enter the corresponding screen, as shown in the fol-
lowing figure.
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Parameter Description
Set enabling/disabling of the PID night recovery function. PID night
PID Recovery recovery function operates between 22:00 pm and 5:00 am by
default.
If ISO impedance abnormality or PID function exception is de-
tected during running of the PID function, the inverter reports a
Clear PID alarm
PID false alarm and reminds the user to take corresponding meas-
ures. After processing, clear the alarm via this parameter.
PID Scheme Apply negative or positive voltage.
AFCI Parameters
Tap Settings→Operation Parameters→AFCI Parameters to enter the corresponding
screen, on which you can set "AFCI Parameters".
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Definition/Setting
Parameter Range
Description
Active power soft start The switch for enabling/dis- Enable/Disable
after fault abling the soft start function
after a fault occurs.
Active power soft start Time that the soft start takes to 1s~1200s
time after fault raise the power from 0 to
100% rated power.
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7 iSolarCloud App User Manual
Definition/Setting
Parameter Range
Description
Active power gradient Switch for enabling/disabling Enable/Disable
control the active power rate settable
function.
Active power decline The decline rate of inverter ac- 1%/min~6000%/min
gradient tive power per minute.
Active power rising The rise rate of inverter active 1%/min~6000%/min
gradient power per minute.
Active power setting Switch for enabling/disabling Enable/Disable
persistence the function of saving output
limited power.
Active power limit The switch for limiting output Enable/Disable
power.
Active power limit ratio The ratio of limiting output 0%~110%
power to rated power in
percentage.
Shutdown when active Switch used to determine Enable/Disable
power limit to 0% whether the inverter is in stop
state when the limited power
reaches 0.
Switch used to ensure that the
inverter operates at the maxi-
Active Overload
mum active power when PV Enable/Disable
Switch
power limit ratio is set over
100%.
Ripple Control Switch for Ripple Control On/Off
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User Manual 7 iSolarCloud App
Definition/Setting
Parameter Range
Description
The inverter provides the reactive power regulation function. Enable this function under "Re-
active Power Regulation Mode" and select the appropriate mode.
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7 iSolarCloud App User Manual
Mode Descriptions
Off The PF is fixed at +1.000.
PF The reactive power can be regulated by the parameter PF (Power Factor).
Qt The reactive power can be regulated by the parameter Q-Var limits (in %).
Q(P) The PF changes with the output power of the inverter.
Q(U) The reactive power changes with the grid voltage.
“Off” Mode
The reactive power regulation function is disabled. The PF is limited to +1.000.
“PF” Mode
The power factor is fixed and reactive power setpoint is calculated according to the current
power. The PF ranges from 0.8 leading to 0.8 lagging.
Leading: the inverter is sourcing reactive power to the grid.
Lagging: the inverter is injecting reactive power into the grid.
“Qt” Mode
In the Qt mode, system rated reactive power is fixed, and the system injects reactive power
according to the delivered reactive power ratio. The Reactive Power Ratio is set through
the App.
The setting range of the reactive power ratio is 0~100% or 0~-100%, corresponding to the
ranges of inductive and capacitive reactive power regulation respectively.
“Q(P)” Mode
The PF of the inverter output varies in response to the output power of the inverter.
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Parameter Range
To avoid download failure due to poor on-site network signal, it is recommended to download
the firmware package to the mobile device in advance.
step 2 Open the App, enter the account and password on the login screen. Tap Login to enter the
home screen.
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User Manual 7 iSolarCloud App
step 3 Tap More→Firmware Download to enter corresponding screen on which you can view the
device list.
step 4 Select the device model before downloading the firmware. Tap the device name in the de-
vice list to enter the firmware upgrade package detail interface, and tap behind the firm-
ware upgrade package to download it.
step 5 Return to the Firmware Download screen, tap in the upper right corner of the screen to
view the downloaded firmware upgrade package.
step 6 Login the App via local access mode. Refer to "7.3 Login".
step 7 Tap More on the App home screen and then tap Firmware Update.
step 8 Tap the upgrade package file, a prompt box will pop up asking you to upgrade the firmware
with the file, tap CONFIRM to perform the firmware upgrade.
step 9 Wait for the file to be uploaded. When the upgrade is finished, the interface will inform you of
the upgrade completion. Tap Complete to end the upgrade.
- - End
Tap Modify Password to enter the modify password screen, as shown in the following
figure.
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7 iSolarCloud App User Manual
The password shall consisit of 8–20 digits, including letters and numbers.
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8 System Decommissioning
Danger of burns!
Even if the inverter is shut down, it may still be hot and cause burns. Wear protec-
tive gloves before operating the inverter after it cools down.
For maintenance or other service work, the inverter must be switched off.
Proceed as follows to disconnect the inverter from the AC and DC power sources. Lethal
voltages or damage to the inverter will follow if otherwise.
step 1 Disconnect the external AC circuit breaker and secure it against reconnection.
step 2 Rotate the DC switch to the "OFF" position for disconnecting all of the PV string inputs.
step 3 Wait about 15 minutes until the capacitors inside the inverter completely discharge.
- - End
step 1 Refer to "5 Electrical Connection", for the inverter disconnection of all cables in reverse
steps. In particular, when removing the DC connector, use an MC4-Evo2 wrench to loosen
the locking parts and install waterproof plugs.
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8 System Decommissioning User Manual
step 2 Refer to"4 Mechanical Mounting", to dismantle the inverter in reverse steps.
step 4 If the inverter will be used again in the future, please refer to "3.2 Inverter Storage" for a
proper conservation.
- - End
Please scrap the inverter in accordance with relevant local regulations and stand-
ards to avoid property losses or casualties.
Some parts of the inverter may cause environmental pollution. Please dispose of
them in accordance with the disposal regulations for electronic waste applicable at
the installation site.
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9 Troubleshooting and Maintenance
9.1 Troubleshooting
Once the inverter fails, the fault information can be displayed on the App interface. If the in-
verter is equipped with an LCD screen, the fault information can be viewed on it.
The fault codes and troubleshooting methods of all PV inverters are detailed in the table be-
low. The device you purchase may only contain some of the fault information, and when the
inverter fails, you can check the corresponding information through the fault codes from the
mobile app.
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User Manual 9 Troubleshooting and Maintenance
28, 29, 208, PV Reserve Con- 2. Contact Sungrow Customer Service if the pre-
212, 448-479 nection Fault ceding causes are ruled out and the fault persists.
*The code 28 to code 29 are corresponding to
PV1 to PV2 respectively.
*The code 448 to code 479 are corresponding to
string 1 to string 32 respectively.
1. Check whether the corresponding string is of
reverse polarity. If so, disconnect the DC switch
and adjust the polarity when the string current
drops below 0.5 A.
2. Contact Sungrow Customer Service if the pre-
532-547, 564- PV Reverse Con-
ceding causes are ruled out and the alarm
579 nection Alarm
persists.
*The code 532 to code 547 are corresponding to
string 1 to string 16 respectively.
*The code 564 to code 579 are corresponding to
string 17 to string 32 respectively.
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9.2 Maintenance
9.2.1 Maintenance Notices
• Before any service work, first disconnect the grid-side AC circuit breaker and
check the inverter status. If the inverter indicator is off, please wait until night to
disconnect the DC switch. If the inverter indicator is on, directly disconnect the
DC switch.
• After the inverter is powered off for 15 minutes, measure the voltage and cur-
rent with professional instrument. Only when there is no voltage nor current
can operators who wear protective equipment operate and maintain the inverter
• Even if the inverter is shut down, it may still be hot and cause burns. Wear pro-
tective gloves before operating the inverter after it cools down.
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9 Troubleshooting and Maintenance User Manual
Restart the inverter only after removing the fault that impairs safety performance.
As the inverter contains no component parts that can be maintained, never open
the enclosure, or replace any internal components.
To avoid the risk of electric shock, do not perform any other maintenance opera-
tions beyond this manual. If necessary, contact your distributor first. If the problem
persists, contact SUNGROW. Otherwise, the losses caused is not covered by the
warranty.
Touching the PCB or other static sensitive components may cause damage to the
device.
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User Manual 9 Troubleshooting and Maintenance
• Power off the inverter and disconnect it from all power supplies before main-
taining fans.
• After the inverter is powered off for 15 minutes, measure the voltage and cur-
rent with professional instrument. Only when there is no voltage nor current
can operators who wear protective equipment operate and maintain the inverter.
Fans inside the inverter are used to cool the inverter during operation. If the fans do not op-
erate normally, the inverter may not be cooled down and inverter efficiency may decrease.
Therefore, it is necessary to clean dirty fans and replace the broken fans in a timeiy manner.
The operation procedure is as follows:
step 2 Loosen the screw on the sealing plate of the fan module.
step 3 Press the tab of the latch hook, unplug the cable connection joint outwards, and loosen the
screw on the fan holder.
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9 Troubleshooting and Maintenance User Manual
step 4 Pull out the fan module, clean the fans with soft brush or vacuum cleaner, and replace them
when necessary.
step 5 Reinstall the fan back to the inverter in reverse order and restart the inverter.
- - End
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10 Appendix
Input (DC)
Recommended max.
35 kWp 42 kWp 46.2 kWp
PV input power
No. of independent
3
MPP inputs
Max. DC short-circuit
120 A (40 A * 3)
current
Output (AC)
Rated AC output
25 kVA 30 kVA 33 kVA
power
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10 Appendix User Manual
Efficiency
Protection
AC short-circuit Yes
protection
DC switch Yes
General Data
Weight 38 kg
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User Manual 10 Appendix
Topology Transformerless
Corrosion C5
Grid Support Q at night function, LVRT, HVRT,active & reactive power control
and power ramp rate control
(1): 30kVA for Germany, Belgium, Austria, Ukraine and Denmark, 33kVA for others.
Input (DC)
No. of independent 4
MPP inputs
97
10 Appendix User Manual
Output (AC)
Efficiency
Protection
98
User Manual 10 Appendix
AC short-circuit Yes
protection
DC switch Yes
General Data
Weight 40 kg 40 kg 41 kg
Topology Transformerless
Corrosion C5
99
10 Appendix User Manual
Grid Support Q at night function, LVRT, HVRT,active & reactive power control
and power ramp rate control
Input (DC)
Output (AC)
100
User Manual 10 Appendix
Power factor at rated power / > 0.99 / 0.8 leading – 0.8 lagging
Adjustable power factor
Efficiency
Protection
DC Yes
reverse connection protection
DC switch Yes
General Data
Weight 38 kg 41 kg
Topology Transformerless
101
10 Appendix User Manual
Corrosion C5
(2):For Australia.
The maximum wiring distance of DC dry contact must meet the requirements in the Table
below. The wiring distance L is the total length of all DI signal cables.
LK refers to the cable length in one direction between the DI dry contact terminal of the kth in-
verter and the corresponding terminal of the (k-1)th inverter.
table 10-1 Correspondence between number of inverters and maximum wiring distance
1 13030 10552
2 6515 5276
3 4343 3517
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User Manual 10 Appendix
4 3258 2638
5 2606 2110
6 2172 1759
7 1861 1507
8 1629 1319
9 1448 1172
10 1303 1055
11 1185 959
12 1086 879
13 1002 812
14 931 754
15 869 703
16 814 660
17 766 621
18 724 586
19 686 555
20 652 528
21 620 502
22 592 480
23 567 459
24 543 440
25 521 422
In case the specification of the cable used is not included in the Table above, when
there is only one inverter, ensure that the line impedance of the input node is less
than 300Ω; and when there are multiple inverters connected in the daisy chain, en-
sure that the impedance is less than 300Ω/number of inverter.
103
10 Appendix User Manual
When product faults occur during the warranty period, SUNGROW will provide free service
or replace the product with a new one.
Evidence
During the warranty period, the customer shall provide the product purchase invoice and
date. In addition, the trademark on the product shall be undamaged and legible. Otherwise,
SUNGROW has the right to refuse to honor the quality guarantee.
Conditions
• The customer shall give SUNGROW a reasonable period to repair the faulty device.
Exclusion of Liability
In the following circumstances, SUNGROW has the right to refuse to honor the quality
guarantee:
• The free warranty period for the whole machine/components has expired.
• The device operates in harsh conditions beyond those described in this manual.
• The installation and use range are beyond stipulations of relevant international
standards.
For faulty products in any of above cases, if the customer requests maintenance, paid main-
tenance service may be provided based on the judgment of SUNGROW.
• Fault code/name
104
Sungrow Power Supply Co., Ltd.
www.sungrowpower.com