Sunnytek SUN-1K-G User manual

PV Grid Tie Inverter
SUN-1K-G SUN-2K-G
SUN-3K-G
User manual

Contents Contents
1. Introduction
1.1 Appearance Introduction
1.2 Parts list
2. Safety warnings and instructions
2.1 Safety signs
2.2 Safety instructions
2.3 Notes for using
3. Operation Interface
3.1 Interface View
3.2 Status Indicator
3.3 Buttons
3.4 LCD Display
4. Product installation
4.1 Select installation location
4.2 Inverter Installation
5. Electrical Connection
5.1 DC input terminal connection
5.2 AC input terminal connection
5.3 The connection of the ground line
5.4 Inverter monitoring connection
6. Startup and Shutdown
6.1 Start up the inverter
6.2 Inverter Shutdown
7. Limiter function
7.1 Limiter function wiring diagram
7.2 Use of limiter function
7.3 Notes while using limiter function
8. General Operation
8.1 The initial interface
8.2 Statistics information
8.3 Fault Record
8.4 ON/OFF setting
8.5 Parameter setting
8.5.1 System Param
8.5.1.1 Time set
8.5.1.2 Language set
8.5.2 Running Param
8.5.3 Protect Param
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Contents
9. Repair and Maintenance
10. Error information and processing
10.1 Error code
10.2 Troubleshooting
11. Specification

1. Introduction
Application of inverter in photovoltaic power system
1.1 Appearance Introduction
1.2 Parts list
Single Phase String Power Inverter can convert solar panel DC power into AC power
which can directly input to the grid. Its appearance is shown below.These models contain
SUN-1K-G、SUN-2K-G and SUN-3K-G .The following is collectively referred to as
‘inverter’.
Pic1.1 Front view Pic1.2 Bottom view
Pic1.3 Accessories drawing
Table1.1 Parts list
Description
Inverter
Wall mounting bracket
Mounting stainless steel screws M4×12
AC power connectors
DC power connectors（including Inserted spring）
Stainless steel anti-collision bolt M6×80
Square hole sealing plate（For WIFI function ）
Sensor Clamp(optional)
Instruction book
Wi-Fi-Plug（For WIFI function ）
No
1
2
3
4
5
6
7
8
9
10
1
1
4
1
1pairs
2
1
1
1
1
Qty
Please check the following table, to see whether all the parts are included in the package：
1
67
2345
8910
Serial number Description
A
B
C
D
E
Inverter
Metering device
PV strings
Power grid
Family load
ABCD
E
ACDC AlarmNormal
ACDC AlarmNormal
ACDC AlarmNormal
limiter
DC SWITCH
ON
OFF RS485
RS232485
- 01 - - 02 -
Photovoltaic Grid-connected System

2. Safety warnings and instructions
2.1 Safety signs
Improper use of the inverter will cause electric shock and burn.During the installation and
maintenance.Please operate the inverter in strict accordance with the user manual.Please
read the user manual carefully before using the inverter.And please keep the instructions
properly for afterwards use.
Safety signs are used to emphasize potential safety risk and important safety information.
The manual includes below signs:
2.2 Safety instructions
Safety warning——Indifference of the signs in the manual may cause
injury or even death.
Shock warning sign——Incorrect follow of this sign may get shocked.
Prudent operation——Incorrect follow of the safety operation hints in
this manual may cause inverter defect.
Local temperature of inverter may exceed 80℃ while under operating.
Please do not touch the inverter surface.
Electrical installation of the inverter must conform to the safety operation
rules of the country or local area.
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Local temperature of inverter may exceed 80℃ while under operating.
Please do not touch the inverter case.
=GXTOTM
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Inverter adopts non-isolated topology structure, hence must insure DC
input and AC output are electrical isolated before operating the inverter.
Strictly prohibit grounding the positive and negative poles of the PV string.
Otherwise it will damage the inverter.
=GXTOTM
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Prohibit disassembling inverter case, there existing shock hazard,which may
cause serious injury or death, please ask qualified person to repair.
9NUIQ.G`GXJ
When PV module is exposed to sunlight, the output will generate DC
voltage. Prohibit touching to avoid shock hazard.
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While disconnect the input and output of the inverter for maintenance,
please waits for at least 5 mins until the inverter discharge the remnant
electricity.
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- 03 - - 04 -

2.3 Notes for using
3.2 Status Indicator
3. Operation Interface
1. Inverter should be installed and maintained by qualified person under local standard
regulations.
2. Must disconnect the AC side first, then disconnect DC side while doing installation
and maintenance, after that, please wait at least 5 mins to avoid getting shocked.
3. Local temperature of the inverter may exceed 80 ℃ while under operating.Do not
touch to avoid getting injured.
4. All electrical installation must be in accord with local electrical standards, and after
obtaining the permission of the local power supply department, the professionals can
connect the inverter to the grid.
5. Please take appropriate anti-static measure.
Pic 3.1 Panel
6. Please install where children can not touch.
8. Don’t insert or remove AC and DC terminals when the inverter is in normal
operation.
9. The DC input voltage of the inverter must not exceed the maximum value of the
model.
The inverter panel has 4 indicators, the left one is DC output indicator, green indicates
normal DC input. Beside is the AC indicator, green in dicates normal AC connecting.
Next is the operating indicator,green indicates normal output.The right indicator is
alarm indicator, red indicates alarming.
7. When starting the inverters, first close the circuit breaker at the grid side, then
close the DC side; when closing the inverters, first disconnect the circuit
breaker at the AC side, then disconnect the DC side.
The single phase string power inverter is designed and tested under related safety
regulations. It can ensure the personal safety of the user. But as a electric device,it may
cause shock or injury by incorrect operation. Please operate the unit under below
requirements:
3.1 Interface View
- 05 - - 06 -
ACDC AlarmNormal

3.3 Buttons
4.1 Select installation location
4. Product installation
There are four buttons on the inverter panel：above is up and increase button (UP),below
is down and decrease button (DOWN）, left is ESC button (ESC）, right is Enter button
(ENTER). The following functions can be achieved by the four buttons：
● Page turning (use UP and DOWN button）
● Modify adjustable parameters (use ESC and ENTER button）
Pic4.1 Recommended installation place
When you receive the inverter and prepare to install it, please select a suitable location,
which should consider below factors:
● Ventilation—Must insure the air ventilation of the installation location,improper
installation may cause overheating and effect the working efficiency and lifespan.
● Sun-shade—Expose the inverter to sunshine will cause overh eating and effect the
working efficiency.
● Avoid rain and snow—Even if the inverter has IP65 protection.We still recommend
installing the inverter at the ventilate place where can avoid rain and snow. It can help
extend the lifespan of the inverter.
3.4 LCD Display
SUN-1K/2K/3K-G single-phase string inverters use a dot matrix display,mainly contains
the following：
● Inverter operation status and information;
● Operating information;
● Warning message and malfunction display.
Explanation
Inverter detects DC input
Low DC input voltage
Grid Connected
Grid Unavailable
Under normal operating
Stop operating
Detected faults or report faults
Under normal operating
Indicator status
●DC
●AC
● NORMAL
● ALARM
on
off
on
off
on
off
on
off
- 07 - - 08 -

● Please select the wall with certain bearing vcapacity.
● When doing the installation, vertical slope cannot exceed +/-15°,make sure nolateral
tilt. Otherwise it will affect the function of the heat sink. Cause the output power lower
than expected.
● If install more than one inverter, must leave at least 500mm gap between each inverter.
And each inverter must be at least 500mm above and below.And must install the inverter
at the place where children cannot touch. Please see picture 4.3.
● Consider whether the installation environment is helpful to see the inverter LCD display
and indicator status clearly.
● Must offer a ventilate environment if inverter installed in the airtight house.
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Do not place or store any items next to the inverter. Pic4.3 Installation Gap
Inverter should be installed vertically installed, as shown in picture 4.4，installation.
Pic4.4 Inverter Installation
The inverter is designed according to the wall mounted type installation, please use the wall
mounted (the brick wall of the expansion bolt) when installing.
4.2 Inverter Installation
Pic4.2 Installation Angle
≥500mm
≥500mm
≤15°
Anchoring
Mounting bracket
M4*14 Stainless steel screws
Inverter
- 09 - - 10 -

Procedure shows below:
Locate on the appropriate wall according to the bolt position on the mounting bracket,
then mark the hole.On the brick wall, the installation must be suitable for the expansion
bolt installation.
2.Ensure that the position of the installation holes on the wall is in accordance
with themountingplate, and the mounting rack is horizontally placed.
3. Hang the inverter to the top of the mounting rack and then use the M4 screw in the
accessory to lock inverter heat sink to the hanging plate, to ensure that the inverter
will not move.
Pic4.5 Inverter hanging plate installation
- 11 - - 12 -

1. Switch AC off
2. Switch DC off
3. Connect the inverter to the grid
Pic5.1 DC+connector (MC4)
7mm
The steps of assembling the DC connector are listed as follows：
a)Strip off the DC wire about 7mm, disassemble the connector cap nut
(see picture 5.3)
c) Insert the contact pin into the connector housing until it locks in place. Screw the
cap nut onto the connector housing. Torque to 2.5-3Nm (as shown in picture 5.5).
d) Finally insert the DC connector into the positive and negative input of the
inverter，shown as picture 5.6
b) Crimping metal terminals with crimping pliers as shown in picture 5.4.
Pic5.2 DC-connector (MC4
Pic5.5 connector with cap nut screwed on
Table 5.1 DC Cable Specifications
Pic5.6 DC input connection
Pic5.3 Disassemble the connector cap nut
Pic5.4 Crimp the contact pin to the wire
5.1 DC input terminal connection
5 Electrical Connection
2
Traverse area（mm ）
Cable type Range
4.0(12AWG) 5.5-9.0
Recommended
size
Outside diameter
of cable（mm）
4.0-6.0
(12-10AWG)
Industry generic PV
cable
（model;PV1-F）
7mm
- 13 - - 14 -

Sunlight shines on the panel will generate voltage, high voltage in series may
cause danger to life. Therefore, before connecting the DC input line, the
solar panel needs to be blocked by the opaque material and the DC switch
should be 'OFF', otherwise, the high voltage of the inverter may lead to
life-threatening conditions
.
Do not close the DC switch after the DC terminal is connected.Connect the AC terminal
to the AC side of the inverter, the AC side is equipped with single-phase AC terminals
that can be conveniently connected.Flexible cords are recommended for easy installation.
The specifications are as shown in Table 5.2.
1. Matching socket 2.Sleeve 3.Sealing core 4.Sealing nut
Pic5.7 AC connector structure
The AC output connector is divided into three parts: matching socket, sleeve and sealing
sleeve, as shown in picture 5.7, the steps are as follows:
Step 1: Remove the cable sealing ring and sleeve in sequence from the AC connector.
Step 2: Separate the sleeve from the matching socket,as shown in picture 5.7, the
connector body has two locking holes, and press the locking valve in the hole
inward to separate the matching socket from the sleeve.
Step 3: Use strippers to strip the protective sheath and insulation layer of the AC
cable to the right length, as shown in Picture 5.8.
=GXTOTM͹
45:+͹
Prohibit using a single circuit breaker for multiple inverters,prohibit the
connection of load between inverter circuit breakers.
Table 5.2 Cable information Pic5.8 Strip AC cable
5.2 AC input terminal connection
Outside cable(2+PE)20m
Specification
Model SUN-1K-G
10A/400V
SUN-2K-G
16A/400V
SUN-3K-G
20A/400V
Cable
CSA
Cable
outer dia AWG
122.5mm 15-18mm
Cable
CSA
Cable
outer dia AWG
1215-18mm
Cable
CSA
Cable
outer dia AWG
1215-18mm
22.5mm22.5mm2
Breaker
Max cable
length
=GXTOTM͹
Be careful to distinguish the L, N and PE of the AC cables.
1
2
34
8~15mm
40mm
- 15 - - 16 -

Step 4: Insert the cable (L, N, PE) into the sealing sleeve and sleeve.
Step 5: Use the hexagon screwdriver, loosen the bolts of the socket in turn, and insert each
cable core into the corresponding jack, and set each screw.The connection hole of AC
connection terminal labeling is shown in picture 5.9.
Good grounding is good for resisting surge voltage shock and improving EMI performance.
Therefore, before connecting AC, DC and communication cables, you need to ground the
cable firstly. For a single system, just ground the PE cable. For multiple machine systems,
all PE cables of the inverter need to be connected to the same grounding copper platoon to
ensure the equipotential connection. The installation of the shell ground wire is shown as
picture 5.11.
Inverter has the function of wireless remote monitoring. The inverter with Wi-Fi function
is equipped with Wi-Fi Plug to connect the inverter and network. Wi-Fi Plug's operation,
installation, Internet access, APP downloading and other processes are detailed in the
instructions. Picture5.12 is the Internet monitoring solution.
5.3 The connection of the ground line
5.4 Inverter monitoring connection
Step 6: Set the sleeve and sealing ring in place.
Step 7 :Connect the terminals to the inverter as shown in picture 5.10.
=GXTOTM͹
Inverter has built-in leakage current detection circuit,If an external leakage
current protection device is connected, its operating current must be
greater than 300 mA or higher,otherwise inverter may not work properly.
Pic5.10 AC input connection
Pic5.9 AC Connector Hole Pattern
Pic5.11The installation of the shell ground wire
- 17 - - 18 -

5.4.2 Configuration of Wi-Fi Plug
For the configuration of Wi-Fi Plug,please refer to illustrations of the Wi-Fi Plug.
When the inverter is out of the factory, the installation location of Wi-Fi plug is sealed by a
plate as shown in Picture 5.13. When installing the Wi-Fi Plug, remove the sealing plate,
replace it with the sealing plate with square hole in the accessories, and tighten the screws.
Insert the Wi-Fi Plug into the interface and fix it with a screw. The configuration of the
Wi-Fi Plug needs to be performed after various electrical connections have been completed
and the inverter DC power on. When the inverter is on the DC power, it is determined
whether the Wi-Fi Plug is normally electrified (The LED light shines out of the shell).
5.4.1 Installation of Wi-Fi Plug
Pic5.12 Internet monitoring solution
Pic5.13 Wi-Fi Plug installation diagram
PC
Web Server
Phone
Router
WIFI
GPRS
- 19 - - 20 -

Before starting the inverter, make sure that the inverter can meet the following conditions,
otherwise it may result in fire or damage to the inverter. In this case,we do not undertake
any responsibility. To optimize the system configuration, it is recommended that the two
inputs be connected to the same number of PV modules.
The SUN-1K/2K/3K-G inverter has integrated export limitation function.The function is
to adjust the output of inverter quickly according to the power of the user and solar panels,
prevent the output of the inverter from being fed to the power grid. This limiter function is
optional. If you buy the inverter with limiter, a current sensor will be included in the
package which is necessary for limiter function.
When you are reading this, we believe that you have completed the connection according
to the requirements of chapter 5, if you has been running your inverter at this time, and
you want to use the limiter function, please turn off AC and DC switch of the inverter, and
wait for 5 minutes until the inverter completely discharged. Then connect the current
sensor to the inverter limiter interface.Make sure they are reliably connected, and the
current sensor should clamp to the live wire of the incoming line.In order to make it easier
for you to use the built-in limiter function of the SUN-1K/2K/3K-G, we have specifically
given the wiring diagram,as shown in Picture 7.1, the red lines connected to the utility grid
said wire (L), blue line shows the zero line (N), yellow green line shows the ground wire
(PE). We recommend installing a AC switch between the inverter outlet and the utility
grid, the specs of the AC switch is determined according to the load capacity. The AC
switch we recommend to connect to the inverter output can refer to Table 5.1.If there is
no integrated DC switch inside the inverter you purchased, were commend you to
connect the DC switch. The voltage and current of the switch depends on the PV array
you access.
When start up the single phase string inverter, should fellow below steps：
1. First switch on the AC breaker.
2. Turn on the DC switch of the PV module, and if the panel provides sufficient
starting voltage and power, the inverter will start.
3. When the AC voltage and DC voltage are normal, the start-up is ready to begin.
The inverter will first check the internal parameters and the grid parameters,while the liquid
crystal will show that the inverter is self-checking.
4. If the parameter is within acceptable range, the inverter will generate the normal grid.
NORMAL indicator light is on.
Must follow below steps while shutting down the inverter:
1. Switch off the AC breaker.
2. Wait for 30 seconds, turn off the DC switch (if any), or simply disconnect the DC
input connector. The inverter will close the LCD and all led within two minutes.
a). The maximum open voltage of each set of PV modules shall not exceed 600VDC
under any conditions.
b). Each input of the inverter must use the same type of PV module in series.
c). Total output power of PV shall not exceed the maximum input power of inverter,
each PV modules shall not exceed the rated power of each channel.
d). The short circuit current of each series of PV modules cannot be greater than 10A
at any time.
6. Startup and Shutdown 7. Limiter function
6.1 Start up the inverter
7.1 Limiter function wiring diagram
6.2 Inverter Shutdown
- 21 - - 22 -

Pic7.1 Connection diagram of limiter
Pic 7.3 Limit switch
System Param
Param
<<
Run
Fun GFDI OFF
_
0FF <<Limiter
Utility Power:
OW
Pic 7.4 Limiter function turn on
When the connection is completed, the following steps should be referenced to use this
function:
1.Turn on the AC switch.
2. Turn on the DC switch , waiting for the inverter LCD lighting up.
3. Press Enter button on the LCD panel in the main interface into the menu
options, select [parameter setting] to enter setup submenu, and then select [running
parameters] as shown in picture 7.2, at this time please input the default password
1234 through pressing the button [up down, confirm], enter the operation parameter
setting interface, shown as picture 7.3.
4. Operate the button [up down], move setting cursor to limiter function and press the
button [enter]. At this time you can turn on or turn off the limiter function by choosing
[up down] button, please press [enter] button to confirm when setting done.
5. Move the cursor to [confirm], press ENTER to save the settings and exit the running
parameters page, otherwise the settings are invalid.
6. If set up successfully, you can return to the menu interface, and display the LCD to
[output data] by press the [up down] button. If it displayed as [grid power], the limiter
function settings will be completed. Shown as picture 7.4
7. [grid power] showing positive means grid power is consuming energy, and there is no
backflow. If [grid power] shows negative, it means there is no backflow. If [grid power]
shows negative, it means backflow to the grid or current transformer direction error has
occurred. Please read more on chapter 7.3.
8. After properly connection is done, wait for inverter starting. If the power of the PV
array meets the current power consumption, the inverter will maintain a certain output
to counteract the power of the grid without backflow .
7.2 Use of limiter function
Down
Up
Enter
ACDC Alarm
Normal
Esc
Utility Grid Load
Solar Panel array
L
NSensor
PE
ACDC Alar mNorma l
- 23 - - 24 -

Under limiter function we strongly recommend that the two PV
arrays are formed by the same number of PV panels of the same
size, which will make the inverter more responsive to limit the
power.
When using limiter function, you need to ensure that the opening
voltage of PV input is no more than 450V, otherwise it may cause
inverter malfunction. Do not have this limitation if inverter is not
working under limiter function.
While the grid power is negative and inverter has no output
power, that means the orientation of the current sensor is wrong,
please turn off the inverter and change orientation of the current
sensor.
The current sensor of limiter function needs to be clamped on the
fire line of the grid connected to the inverter, otherwise inverter
cannot able to normal operate. Pic8.1 LCD operation flow chart
From the initial interface, you can check power and the inverter current status.The status
of the inverter include stand by, self check, normal and error.
8.1 The initial interface
For your safety and the operation of limiter function of the inverter, we put forward the
following suggestions and precautions:
7.3 Notes while using limiter function
During normal operation, the LCD shows the current status of the inverter, including the
current power, total generation, a bar chart of power operation and inverter ID,etc. Press
the Up key and the Down key to see the current DC voltage, DC current, AC voltage, AC
current, inverter radiator temperature,software version number and Wifi connection state
of the inverter.
8. General Operation
Do not change the operating parameters if non-professional when
setting the limiter function switch, otherwise inverter cannot be normal
operated.
=GXTOTM
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Start
LCD main menu
AC output data
Temp and
interface
Generated energy
Operation
information
Fault record
Production data
Testing data
on/off
Param setting
System param
Running param
Protection param
Comm param
DC input data
Time
- 25 - - 26 -

Pic8.2 The initial interface
Pic8.6 Main Menu
Pic8.7 Device information
Pic8.3 PV input and DC current information
Pic8.4 AC running state information
Pic8.5 Temperature
ON/OFF
<<
Setup
Device Info.
<<
Fault Record
GL1030 SN-01
ID:1707010001
ID:1707010001
Ver0201 Ver5102
Power: 108W
NormalState:
PV1:276.2V 0.6A
Grid:240V 0.5A
Freq: 50.03Hz
Press UP or Down, you can check inverter DC voltage, DC current, AC voltage,AC
current and inverter temperature.
8.2 Device information
In this interface, you can see the temperature of the inverter. It indicates the temperature of
the radiator.
There are four submenus in the Main Menu.
You can check the PV information, the number of strings input,MPPT voltage and
MPPT current.
You can check the single phase voltage, current and grid frequency.
You can see the LCD software Ver0201 and inverter software Ver5102. In this interface,
there are parameters such as rated power communication addresses.
Temp:35.3 ℃C
- 27 - - 28 -

Pic8.8 Fault Record
Pic8.10 Setting
Pic8.11 System Param
Pic8.12 Time set
Pic8.9 ON/OFF setting
It can keep four fault records in the menu including time, customer can deal with it
depends on the error code.
When the inverter is turned off, it stops immediately and does not work until its turning
on.
8.3 Fault Record
Setting includes system param, run param, protect param, comm：param. All of these
information for maintenance reference.
8.5 Parameter setting
System Param includes time set, language set, display set and factory reset.
8.5.1.1 Time set
8.4 ON/OFF setting
1 F19 181017 07
2 F35 181015 08
Turn ON
<<
Turn OFF
System Param
<<
Run Param
Run Param
<<
Protect Param
<<
Protect Param
Comm. Param
Time Set
<<
Language Set
Display Set
<<
Factory Reset
20181017 OK
Cancel08:45:57
- 29 - - 30 -

English
<<
PassWord
****
ActiveP 100%
<<
ReactiveP 0%
oo CHINA
<<
oo BRAZIL
OO CHINA
<<
oo BRAZIL
AC OverVoltage
<<
265.0V
AC LowVoltage
<<
185.0V
Fun GFDI OFF
<<
Limiter OFF
_
Pic8.13 Language set
Pic8.16 Protect Param
Pic8.14 Password
Pic8.15 Running Param
8.5.1.2 Language set
8.5.2 Running Param
8.5.3 Protect Param
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Password required-- only for access-authorized engineer.
Un-authorized access may avoid the warranty. The initial
password is 1234.
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Engineer Only.
We will set the param depends on the safety requirements, so
customers don’t need to reset it. The password is same as 8.5.2
Running param
4UZK͹
Engineer only.
- 31 - - 32 -

AC OverFreq
<<
51.50Hz
AC LowFreq
<<
47.50Hz
Pic8.17 “CUSTOM”
9. Repair and Maintenance
10.1 Error code
10.Error information and processing
String type inverter doesn’t need regular maintenance. However,debris or dust will
affect heat sink’s thermal performance. It is better to clean it with a soft brush. If the
surface is too dirty and affect the reading of LCD and LED lamp, you can use wet cloth
to clean it up.
If there is any failure,the LCD screen will display an alarm message. In this case,the inverter
may stop feeding energy into the grid. The alarm description and their corresponding
alarm messages are listed Table 10.1
requirements. Before leaving the factory, the inverter has undergone several rigorous tests
to ensure that it can be operated reliably and permanently.
Single-phase string inverters are designed according to grid-connected operating standards.
It meets safety requirements and electromagnetic compatibility.
=GXTOTM
When the device is running, the local temperature is too high and
the touch can cause burns. Turn off the inverter and wait for it
cooling, then you can clean and maintain.
=GXTOTM
No solvent, abrasive materials or corrosive materials can be used for
cleaning any parts of the inverter.
- 33 - - 34 -
*KYIXOVZOUT+XXUXIUJK
DC input polarity reverse faultF01
DC insulation impedance permanent faultF02
DC leakage current faultF03
Ground fault GFDI (battery and grounding)F04
Read the memory errorF05
Write the memory errorF06
GFDI blown fuseF07
GFDI grounding touch failureF08
IGBT damaged by excessive drop voltageF09
Auxiliary switch power supply failureF10
Ac main contactor errorsF11
AC auxiliary contactor errorsF12
ReservedF13
DC firmware over currentF14
AC firmware over currentF15
GFCI(RCD) Ac leakage current faultF16
Three phase current, over-current faultF17
AC over current fault of hardwareF18
All hardware failure synthesisF19
DC over current fault of the hardwareF20
DC leakage flow faultF21
Crash stop (if there is a stop button)F22
AC leakage current is transient over currentF23
DC insulation impedance failureF24
DC reverse irrigation failureF25
The DC busbar is unbalancedF26
DC end insulation errorF27

10.2 Troubleshooting
Table10.2 Troubleshooting
Table10.1 Error code
4UZK
If your SUN-1K/2K/3KW string inverter has any of the fault
ŝŶĨŽƌŵĂƟŽŶƐŚŽǁŶŝŶdĂďůĞϭϬͲϭĂŶĚǁŚĞŶLJŽƵƌĞƐĞƚƚŚĞŵĂĐŚŝŶĞ
ĂŶĚƐƟůůĚŽŶƚƐŽůǀĞƚŚĞƉƌŽďůĞŵƉůĞĂƐĞĐŽŶƚĂĐƚŽƵƌĚŝƐƚƌŝďƵƚŽƌĂŶĚ
ƉƌŽǀŝĚĞƚŚĞďĞůŽǁĚĞƚĂŝůƐ
1、Serial number of the inverter;
2、The distributor/dealer of the inverter(if acailable);
3、Installation date;
4、The discription of problem(include LCD'error code and LED starus indicator lights);
5、Your contact details.
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Grid voltage exceed the nomal working rangeF41~F48
Grid FailureF35
Solar over voltage or low voltageF55 F56
Loss one phase or poor connection or inverter hardware
damage
F26
Grid have some surge loadF15 F18
Ground error or PV + or - short to the GroundF23
PV+ or PV- to the Ground resistance too low . F24
Inverter 1 DC high faultF28
AC load switch failureF29
AC main contactor failureF30
AC secondary contactor failureF31
Inverter 2 dc high faultF32
AC over currentF33
AC current over loadF34
No AC gridF35
AC grid phase errorF36
AC three-phase voltage imbalance failureF37
AC three-phase current imbalance failureF38
AC over currentF39
DC over currentF40
AC Line W,U over voltageF41
AC Line W,U low voltageF42
AC Line V,W over voltageF43
AC Line V,W low voltageF44
AC Line U,V over voltageF45
AC Line U,V low voltageF46
AC Over frequencyF47
AC lower frequencyF48
U phase grid current DC over currentF49
V phase grid current DC over currentF50
W phase grid current DC over currentF51
AC inductor A, phase current DC current highF52
AC inductor B, phase current DC current highF53
AC inductor C, phase current DC current highF54
DC busbar voltage is too highF55
DC busbar voltage is too lowF56
AC reverse irrigationF57
AC grid U over currentF58
AC grid V over currentF59
AC grid W over currentF60
Reactor A phase over currentF61
Reactor B phase over currentF62
Reactor C phase over currentF63
IGBT heat sink high temperatureF64