SunSynk SUN-1K-G User manual

Version 1.1 (10/19/2020)
Solar Pool or Water Pump / Water Heater
AC Hybrid Solar Converter
Run your equipment from the Sun / AC Grid even
both at the same time
User Manual
SUN-1K-G, SUN-2K-G, SUN-3K-G
Global Tech China Ltd, 3 Floor, Wai Yip Industrial Building.171 Wai Yip Street,
Kwun Tong, Kowloon, Hong Kong.
Tel: [phone] Fax: [phone]
www.sunsynk.com / [email protected] / www.globaltechhk.com

INDEX
1. PHOTOVOLTAIC HYBRID SOLAR CONVERTER (ZERO EXPORT INVERTER) ..............................6
1.1. APPEARANCE INTRODUCTION .........................................................................................................................6
1.2. PARTS LIST .................................................................................................................................................7
2. SAFETY WARNINGS AND INSTRUCTIONS ........................................................................................7
2.1. SAFETY SIGNS .............................................................................................................................................8
2.2. SAFETY INSTRUCTIONS ..................................................................................................................................8
2.3. NOTES FOR USING .......................................................................................................................................9
3. OPERATION INTERFACE ......................................................................................................................9
3.1. INTERFACE VIEW .........................................................................................................................................9
3.2. STATUS INDICATOR ......................................................................................................................................9
3.3. BUTTONS ................................................................................................................................................. 10
3.4. LCD DISPLAY ............................................................................................................................................ 10
4. PRODUCT INSTALLATION ................................................................................................................. 11
4.1. SELECT INSTALLATION LOCATION .................................................................................................................... 11
4.2. INVERTER INSTALLATION .............................................................................................................................. 13
5. ELECTRICAL CONNECTION ............................................................................................................... 15
5.1. DC INPUT TERMINAL CONNECTION ................................................................................................................ 15
5.2. AC INPUT TERMINAL CONNECTION ................................................................................................................ 17
5.3. THE CONNECTION OF THE GROUND LINE ......................................................................................................... 19
5.4. INVERTER MONITORING CONNECTION ............................................................................................................ 20
5.4.1. INSTALLATION OF WI-FI PLUG .............................................................................................................................. 20
5.4.2. CONFIGURATION OF WI-FI PLUG .......................................................................................................................... 21
6. STARTUP AND SHUTDOWN ............................................................................................................... 21
6.1. START UP THE INVERTER ......................................................................................................................................... 22
6.2. INVERTER SHUTDOWN ........................................................................................................................................... 22
7. LIMITER FUNCTION ............................................................................................................................. 22

7.1. LIMITER FUNCTION WIRING DIAGRAM ............................................................................................................ 22
7.2. USE OF LIMITER FUNCTION ........................................................................................................................... 23
7.3. NOTES WHILE USING LIMITER FUNCTION .......................................................................................................... 24
8. GENERAL OPERATION ....................................................................................................................... 25
8.1. THE INITIAL INTERFACE ................................................................................................................................ 26
8.2. DEVICE INFORMATION ................................................................................................................................ 27
8.3. FAULT RECORD .......................................................................................................................................... 27
8.4. ON/OFF SETTING ..................................................................................................................................... 27
8.5. PARAMETER SETTING .................................................................................................................................. 28
8.5.1. TIME SET ........................................................................................................................................................... 28
8.5.2. LANGUAGE SET .................................................................................................................................................. 29
8.5.3. RUNNING PARAMETERS....................................................................................................................................... 29
8.5.4. PROTECT PARAMETERS ....................................................................................................................................... 30
9. REPAIR AND MAINTENANCE............................................................................................................. 31
10. ERROR INFORMATION AND PROCESSING ................................................................................... 31
10.1. ERROR CODE .......................................................................................................................................... 31
10.2. TROUBLESHOOTING .................................................................................................................................. 33
11. SPECIFICATION ................................................................................................................................. 34

LIST OF FIGURES
FIGURE 1 – PV SYSTEM DESCRIPTION. ................................................................................................................................................... 6
FIGURE 2 - FRONT VIEW (LEFT) AND BOTTOM VIEW (RIGHT). ..................................................................................................................... 6
FIGURE 3 - ACCESSORIES DRAWING. ..................................................................................................................................................... 7
FIGURE 4 – PANEL. ........................................................................................................................................................................... 9
FIGURE 5 - RECOMMENDED INSTALLATION PLACE. ................................................................................................................................. 11
FIGURE 6 - INSTALLING ANGLE. .......................................................................................................................................................... 12
FIGURE 7 - INSTALLATION GAP. .......................................................................................................................................................... 12
FIGURE 8 - INVERTER INSTALLATION. .................................................................................................................................................. 13
FIGURE 9 - INVERTER HANGING PLATE INSTALLATION. ............................................................................................................................ 13
FIGURE 10 - INVERTER HANGING PLATE BACK VIEW. .............................................................................................................................. 14
FIGURE 11 - DC+ CONNECTOR MC4 (LEFT) AND DC- CONNECTOR MC4 (RIGTH) ....................................................................................... 15
FIGURE 12 - DISASSEMBLE THE CONNECTOR CAP NUT. ........................................................................................................................... 15
FIGURE 13 - CRIMP THE CONTACT PIN TO THE WIRE. .............................................................................................................................. 15
FIGURE 14 - CONNECTOR WITH CAP NUT SCREWED ON. ......................................................................................................................... 16
FIGURE 15 - DC INPUT CONNECTION. ................................................................................................................................................. 16
FIGURE 16 - AC CONNECTOR STRUCTURE (1. MATCHING SOCKET 2. SLEEVE 3. SEALING CORE 4. SEALING NUT). ........................ 17
FIGURE 17 - STRIP THE AC CABLE. ..................................................................................................................................................... 18
FIGURE 18 - AC CONNECTOR HOLE PATTERN. ....................................................................................................................................... 18
FIGURE 19 - INPUT AC CONNECTION. ................................................................................................................................................. 19
FIGURE 20 - INSTALLATION OF THE SHELL GROUND WIRE. ....................................................................................................................... 19
FIGURE 21 - INTERNET MONITORING SOLUTION. ................................................................................................................................... 20
FIGURE 22 - WI-FI PLUG INSTALLATION DIAGRAM. ................................................................................................................................ 21
FIGURE 23 - CONNECTION DIAGRAM OF LIMITER. .................................................................................................................................. 23
FIGURE 24 - PARAMETER SETTING. ..................................................................................................................................................... 23
FIGURE 25 - LIMIT SWITCH. .............................................................................................................................................................. 24
FIGURE 26 - LIMITER FUNCTION TURNED ON. ....................................................................................................................................... 24
FIGURE 27 - LCD OPERATION FLOW CHART. ......................................................................................................................................... 25
FIGURE 28 - THE INITIAL INTERFACE. .................................................................................................................................................. 26
FIGURE 29 - PV INPUT AND DC CURRENT INFORMATION. ....................................................................................................................... 26
FIGURE 30 - AC RUNNING STATE INFORMATION. .................................................................................................................................. 26
FIGURE 31 - TEMPERATURE. ............................................................................................................................................................. 26
FIGURE 32 - MAIN MENU. ................................................................................................................................................................ 26
FIGURE 33 - DEVICE INFORMATION. ................................................................................................................................................... 27
FIGURE 34 - FAULT RECORD. ............................................................................................................................................................. 27
FIGURE 35 - ON/OFF SETTING. ........................................................................................................................................................ 27
FIGURE 36 - SETTING. ..................................................................................................................................................................... 28
FIGURE 37 - SYSTEM PARAMETER. ..................................................................................................................................................... 28
FIGURE 38 - TIME SET. .................................................................................................................................................................... 28
FIGURE 39 - LANGUAGE SET.............................................................................................................................................................. 29
FIGURE 40 - PASSWORD. ................................................................................................................................................................. 29
FIGURE 41 - RUNNING PARAM. ......................................................................................................................................................... 29
FIGURE 42 - PROTECT PARAMETERS. .................................................................................................................................................. 30
FIGURE 43 - CUSTOM. ..................................................................................................................................................................... 30

LIST OF TABLES
TABLE 1 - PV SYSTEM DESCRIPTION. ..................................................................................................................................................... 6
TABLE 2 - PARTS LIST. ........................................................................................................................................................................ 7
TABLE 3 - INDICATORS. .................................................................................................................................................................... 10
TABLE 4 - DC CABLE SPECIFICATION. ................................................................................................................................................... 16
TABLE 5 - CABLE INFORMATION. ........................................................................................................................................................ 17
TABLE 6 - ERROR CODE. ................................................................................................................................................................... 31
TABLE 7 - TROUBLESHOOTING. .......................................................................................................................................................... 33

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1. PHOTOVOLTAIC HYBRID SOLAR CONVERTER (ZERO EXPORT INVERTER)
Run your pool pump, hot water of AC from solar or mains electricity
Figure 1 – PV system description.
Table 1 - PV system description.
Serial number Description
A PV strings
B Inverter
C AC Feed
D Junction Box and CT Limiter
E Equipment being powered
1.1. Appearance Introduction
The Hybrid Converter / Inverter can convert solar panel DC power into AC power, which can directly input
to the grid.
This manual is used for SUN-1K-G, SUN-2K-G and SUN-3K-G models and the appearance of these
inverters is shown in Figure 2.
Figure 2 - Front view (left) and bottom view (right).

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1.2. Parts list
Please check the following table, to see whether all the parts are included in the package：
Figure 3 - Accessories drawing.
Table 2 - Parts list.
No Description Qty
1 Inverter 1
2 Wall mounting bracket 1
3 Mounting stainless steel screws M4×12 4
4 AC power connectors 1
5 DC power connectors (including Inserted spring） 1 pair
6 Stainless steel anti-collision bolt M6×80 2
7 Wi-Fi-Plug (For WIFI function ） 1
8 Square hole sealing plate (For WIFI function ） 1
9 Sensor Clamp 1
2. SAFETY WARNINGS AND INSTRUCTIONS
Improper use of the inverter will cause electric shock and burn during the installation and maintenance.
Please read the user manual carefully before using the inverter. Also, operate the inverter in strict
accordance with this manual and please keep the instructions properly for afterward use.

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2.1. Safety Signs
Safety signs are used to emphasize potential safety risks and important safety information. The manual
includes the below signs:
2.2. Safety Instructions
Warning:
Safety warning—Indifference of the signs in the manual may cause injury, or even death.
Shock Hazard:
Shock warning sign—Following this sign incorrectly may cause electrical shock.
Safety Hint:
Prudent operation— Following the safety operation hints of this manual incorrectly may
cause an inverter defect.
High Temperature Hazard:
The local temperature of the inverter may exceed 80°C while under operating.
Please do not touch the inverter surface.
Warning:
Electrical installation of the inverter must conform to the safety operation rules of the
country or local area.
Shock Hazard:
Prohibit disassembling inverter case, there is an existing shock hazard, which may cause
serious injury or death. Please ask a qualified person to repair it.
Shock Hazard:
When the solar array is exposed to sunshine, it will generate a high DC voltage on it. It is
prohibited touching.
Warning:
This inverter adopts non-isolated topology structure. Therefore, you must ensure DC input
and AC output are electrically isolated before operating the inverter.
Strictly prohibit grounding the positive and negative poles of the PV string. Otherwise, it
will damage the inverter.
Shock Hazard:
While disconnecting the input and output of the inverter for maintenance, please wait for
at least 5 minutes until the inverter discharge the remnant electricity.

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2.3. Notes for Using
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 an electric device, it may cause shock or injury by incorrect
operation. Please operate the unit under the below requirements:
1. The inverter should be installed and maintained by a qualified person under local standard
regulations.
2. You 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. The local temperature of the inverter may exceed 80 °C while under operating. So, do not touch
it to avoid getting injured.
4. All electrical installation must be in accordance with local electrical standards. 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.
6. Please install where children can not touch.
3. OPERATION INTERFACE
3.1. Interface View
Figure 4 – Panel.
3.2. Status Indicator
The inverter panel has four indicators. The left one is the DC output indicator, which gives a green light
if the DC input is normal. Right beside this one, there is the AC indicator, which gives a green light if the
AC connection is normal. Next is the operating indicator, which also gives a green light if the output is
normal. The last indicator on the right is an alarm indicator, which gives a red light that indicates alarming.

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Table 3 - Indicators.
Indicator
Status
Explanation
●DC
on
Inverter detects DC input
off Low DC input voltage
●AC
on
Grid
Connected
off
Grid Unavailable
● NORMAL on Under normal operating
off
Stop operating
● ALARM
on
Detected faults or report faults
off Under normal operating
3.3. Buttons
There are four buttons on the inverter panel: Above there is the up and increase button (UP); below is
the down and decrease button (DOWN); left is the ESC button (ESC); right is the Enter button (ENTER).
The four buttons can achieve the following functions:
 Page turning (use UP and DOWN button）
 Modify adjustable parameters (use ESC and ENTER button
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.

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4. PRODUCT INSTALLATION
4.1. Select installation location
When you receive the inverter and prepare to install it, please select a suitable location, which should
consider the below factors:
 Ventilation - You must ensure the air ventilation of the installation location. Improper installation may
cause overheating, affect the working efficiency and lifespan.
 Sun-shade - Exposing the inverter to sunshine will cause overheating and affect the working
efficiency.
 Avoid rain and snow - Even if the inverter has IP65 protection. We still recommend installing the
inverter at the ventilated place where we can avoid rain and snow. It can help extend the lifespan of
the inverter.
Figure 5 - Recommended installation place.
 Please select the wall with a certain bearing capacity.
 When installing the inverter, the vertical slope cannot exceed +/-15°, making sure no lateral tilt.
Otherwise, it will affect the function of the heat sink and the output power will be lower than expected.
 If installing more than one inverter, you must leave at least a 500mm gap between each inverter.
Each inverter must be at least 500mm above and below. And must install the inverter at the place
where children cannot touch.
 Consider if the installation environment is helpful to see the inverter LCD display and indicator status
clearly.
 You must offer a ventilated environment if inverter installed in the airtight house.

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Figure 6 - Installing angle.
Figure 7 - Installation gap.
Safety Hint:
Do not place or store any items next to the inverter.

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4.2. 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, as shows the figure bellow.
Figure 8 - Inverter installation.
The procedure is shown below:
1. 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.
Figure 9 - Inverter hanging plate installation.

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2. Ensure that the installation holes' position on the wall is in accordance with the mounting plate,
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 the inverter heat sink to the hanging plate, to ensure that the inverter will not move.
Figure 10 - Inverter hanging plate back view.

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5. ELECTRICAL CONNECTION
5.1. DC Input Terminal Connection
1. Switch AC off.
2. Switch DC off.
3. Connect the inverter to the grid.
Figure 11 - DC+ connector MC4 (left) and DC- connector MC4 (rigth)
The steps of the assembling the DC connector are listed as follows:
a) Strip off the DC wire about 7mm, disassemble the connector cap nut (see Figure 12).
Figure 12 - Disassemble the connector cap nut.
b) Crimp the metal terminals with crimping pliers as shown in Figure 13.
Figure 13 - Crimp the contact pin to the wire.

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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 Figure 14).
Figure 14 - Connector with cap nut screwed on.
Table 4 - DC cable specification.
Cable Type
Transverse area (mm2)
Outside diameter of cable
(mm)
Range Recommended
Size
Industry generic PV cable (model:
PV1-F)
4.0-6.0
(12-10
AWG)
4.0 (12 AWG) 5.5-9.0
d) Finally, insert the DC connector into the positive and negative input of the inverter.
Figure 15 - DC input connection.
NOTE:
When sunlight shines on the panel will generate a 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.

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5.2. AC Input Terminal Connection
1. Do not close the DC switch after the DC terminal is connected.
2. Connect the AC terminal to the AC side of the inverter.
3. The AC side is equipped with single-phase AC terminals that can be conveniently connected.
4. Flexible cords are recommended for easy installation. The specifications are as shown in Table 5.
Table 5 - Cable information.
Cable
CSA
Cable
outer
dia
AWG Cable
CSA
Cable
outer
dia
AWG Cable
CSA
Cable
outer
dia
AWG
Specification 2.5mm2
15-
18mm 12 2.5mm2
15-
18mm 12 2.5mm2
15-
18mm 12
Model SUN-1K-G SUN-2K-G SUN-3K-G
Breaker 100A/400V 16A/400V 20A/400V
Max. Cable
Length Outside cable (2+PE) 20m
Figure 16 - AC connector structure (1. Matching socket 2. Sleeve 3. Sealing core 4. Sealing nut).
The AC output connector is divided into three parts: matching socket, sleeve, and sealing sleeve, as
shown in Figure 16, the steps are as follows:
Warning:
Prohibit using a single circuit breaker for multiple inverters. Prohibit the connection of load
between inverter circuit breakers.

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1. Remove the cable sealing ring and sleeve in sequence from the AC connector.
2. Separate the sleeve from the matching socket, as shown in Figure 16, the connector body has
two locking holes, and press the locking valve in the hole inward to separate the matching socket
from the sleeve.
3. Use strippers to strip the protective sheath and insulation layer of the AC cable to the right length,
as shown in Figure 17.
Figure 17 - Strip the AC cable.
4. Insert the cable (L, N, PE) into the sealing sleeve and sleeve.
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 the AC connection
terminal labeling is shown in Figure 18.
Figure 18 - AC connector hole pattern.
6. Set the sleeve and sealing ring in place.
7. Connect the terminals to the inverter as shown in Figure 19.
Warning:
Be careful to distinguish the L, N, and PE of the AC cables.

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Figure 19 - Input AC connection.
5.3. The Connection of the Ground Line
Good grounding is essential for resisting to 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. But, 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 in Figure 20.
Figure 20 - Installation of the shell ground wire.

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5.4. Inverter Monitoring Connection
The 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. Figure 21 shows the Internet
monitoring solution.
Figure 21 - Internet monitoring solution.
5.4.1. Installation of 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 Figure 22.
When installing the Wi-Fi Plug, remove the sealing plate, replace it with the sealing plate with a square
hole in the accessories, and tighten the screws. Then, insert the Wi-Fi Plug into the interface and fix it
with a screw. The Wi-Fi Plug configuration needs to be performed after various electrical connections
WARNING:
The inverter has a 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, the inverter may not work properly.