SunSynk SUN300G3-EU-230 Instruction Manual
Version 1.2 (12/08/2020)
Photovoltaic Grid-connected
Microinverter (Built-in WIFI-G3)
Installation/User Manual
SUN300G3-EU-230, SUN500G3-EU-230, SUN600G3-EU-230, SUN800G3-EU-230,
SUN1000G3-EU-230, SUN1300G3-EU-230, SUN1600G3-EU-230,
SUN1800G3-EU-230, SUN2000G3-EU-230
Global Tech China Ltd, 3 Floor, Wai Yip Industrial Building.171 Wai Yip Street,
Kwun Tong, Kowloon, Hong Kong.
Tel: +852 2884 4318 Fax: +8522884 4816
INDEX
1. IMPORTANT SAFETY INSTRUCTIONS................................................................................................4
1.1. RADIO INTERFERENCE STATEMENT ..........................................................................................................5
1.2. SYMBOLS.................................................................................................................................................5
2. MICROINVERTER SYSTEM INTRODUCTION .....................................................................................6
2.1. MICROINVERTERS MAXIMIZE PV ENERGY PRODUCTION............................................................................7
2.2. MORE RELIABLE THAN CENTRALIZED OR STRING INVERTERS .....................................................................7
2.3. INSTALLATION -SIMPLICITY .....................................................................................................................8
3. MICROINVERTER INTRODUCTION......................................................................................................8
4. MICROINVERTER SYSTEM INSTALLATION.......................................................................................8
4.1. ADDITIONAL INSTALLATION COMPONENTS..............................................................................................9
4.2. REQUIRED PARTS AND TOOLS (USER SUPPLIED) .......................................................................................9
5. INSTALLATION PROCEDURES............................................................................................................9
6. MICROINVERTER SYSTEM OPERATING INSTRUCTIONS.............................................................13
7. TROUBLESHOOTING..........................................................................................................................13
7.1. STATUS INDICATIONS AND ERROR REPORTING.......................................................................................13
7.2. TROUBLESHOOTING A NON-OPERATING MICROINVETER........................................................................14
8. REPLACEMENT....................................................................................................................................15
9. TECHNICAL DATA...............................................................................................................................15
10. WIRING DIAGRAMS...........................................................................................................................19
11. MONITORING PLATFORM................................................................................................................23
LIST OF FIGURES
FIGURE 1-300G3/500G3/600G3/800G3/1000G3 MODELS......................................................................6
FIGURE 2-1300G3/1600G3/1800G3/2000G3. .......................................................................................7
FIGURE 3-INSTALLING THE AC BRANCH CIRCUIT JUNCTION BOX. ...............................................................9
FIGURE 4-300G3/500G3 (1MPPT) AND 600G3/800G3/1000G3 (2MPPT) MOUNTING............................ 10
FIGURE 5-1300G3/1600G3/2000G3 (4MPPT) MOUNTING. ................................................................... 10
FIGURE 6300G3/500G3 (1MPPT) AND 600G3/800G3/1000G3 (2MPPT) CONNECT IN PARALLEL......... 11
FIGURE 71300G3/1600G3/2000G3 (4MPPT) CONNECT IN PARALLEL.................................................. 11
FIGURE 8-L, N, AND PE CONNECTIONS.................................................................................................. 12
FIGURE 9-INSTALLING AC PROTECTIVE END CAP.................................................................................... 12
FIGURE 10 -CONNECTING THE MICROINVERTER TO THE SOLAR MODULES................................................. 12
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1. IMPORTANT SAFETY INSTRUCTIONS
This manual contains important instructions to follow when installing and maintaining the Photovoltaic
Grid-connected Inverter (Microinverter). The following symbols appear throughout this document to
indicate situations that might pose a risk to the user. These should be followed carefully, in order to
reduce the risk of electrical shock and ensure the safe installation and operation of the Microinverter.
Specifications are subjected to change without notice - please ensure you are using the latest manual
found at the manufacturer website.
◼DO NOT disconnect the PV module from the Microinverter without disconnecting the AC power.
◼Only qualified professionals should install and/or replace the Microinverters.
◼Perform all electrical installations in accordance with local electrical codes/guidelines.
◼Before installing or using the Microinverter, please read all instructions and cautionary markings in the
technical documents and the Microinverter system and the solar-array.
◼Be aware that the body of the Microinverter is the heat sink and can reach a temperature of 80°C. To
reduce the risk of burns, do not touch the body of the Microinverter.
◼DO NOT attempt to repair the Microinverter. If it fails, contact technical support to obtain an RMA
number and start the replacement process. Damaging or opening the Microinverter will void the
warranty.
WARNING:
This box indicates a situation where failure to follow instructionsmay cause a serious hardware failure
or personnel danger if not followed appropriately. Use extreme caution when performing this task.
NOTE:
This box indicates information that is important for optimised Microinverter operation. Follow these
instructions strictly.
CAUTION:
The external protective earthing conductor is connected to the inverter protective earthing terminal
through the AC connector. When connecting, connect the AC connector first to ensure the inverter
earthing, then make the DC connections. When disconnecting, disconnect the AC by opening the
branch circuit breaker first but maintain the protective earthing conductor in the branch circuit breaker
connect to the inverter, then disconnect the DC inputs.
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◼In any circumstance, DO NOT connect DC input when the AC connector is unplugged.
◼Please install isolation switching devices on the AC side of the inverter.
Qualified Personnel:
A qualified person is one who has skills and knowledge related to the construction and operation of the
electrical equipment andhas received safety training on the hazards involved. It is authorized to energise,
ground, and tag equipment systems and circuits in accordance with established safety procedures. The
inverter and end-using system may only be commissioned by qualified personnel.
1.1. RADIO INTERFERENCE STATEMENT
CE EMC Compliance: The equipment can comply with CE EMC regulations, which are designed to
protect against harmful interference in a residential installation. The equipment can give out radio
frequency energy and this might cause harmful interference to radio communications if the instructions
presented below are not followed when installing the equipment. If this equipment causes harmful
interference to radio or television reception, the following measures might resolve the issues:
a) Relocate the receiving antenna and keep it well away from the equipment.
b) Consult the dealer or an experienced radio / TV technician for help.
Changes or modifications not expressly approved by the party responsible for compliance may void the
user's authority to operate the equipment.
1.2. SYMBOLS
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2. MICROINVERTER SYSTEM INTRODUCTION
The Microinverter is used in utility-interactive grid-tied applications and it is comprised of two key
elements: the Microinverter and the router.
Figure 1 - 300G3/500G3/600G3/800G3/1000G3 models.
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Figure 2 - 1300G3/1600G3/1800G3/2000G3.
This integrated system improves safety, maximizes solar energy harvest, increases system reliability,
and simplifies solar system design, installation, maintenance, and management.
2.1. MICROINVERTERS MAXIMIZE PV ENERGY PRODUCTION
Each PV module has individual Maximum Peak Power Tracking (MPPT) controls, which ensures that the
maximum power is exported to the utility grid regardless of the performance of the other PV modules in
the array. When PV modules in the array are affected by shade, dust, orientation, or any situation in
which one module underperforms compared with the other units, the Microinverter ensures peak
performance from the array by maximising the performance of each module within the array.
2.2. MORE RELIABLE THAN CENTRALIZED OR STRING INVERTERS
The distributed Microinverter system ensures that no single point of system failure exists across the PV
system. Microinverters are designed to operate at full power at ambient outdoor temperatures of up to
149℉(65℃). The inverter housing is designed for outdoor installation and complies with the IP65
environmental enclosure rating
NOTE:
If the wireless signal in the area where the Microinverter is weak, it is necessary to add a WIFI signal
booster at a suitable place between the router and the Microinverter.
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2.3. INSTALLATION - SIMPLICITY
You can install individual PV modules in any combination of Module quantity, orientation, different type,
and power rate. The Ground wire (PE) of the AC cable is connected to the chassis inside of the
Microinverter, potentially eliminating the installation of grounding wire (check local regulation).
Data collection adopts internal WIFI. A wireless router is needed near the Microinverter. When the
installation of the Microinverter is complete, configure a wireless router with internal WIFI (refer to the
WIFI user manual). The data will be uploaded automatically. Users can monitor and manage the
Microinverter through the corresponding website or APP.
3. MICROINVERTER INTRODUCTION
Microinverters connect with the single-phase grid, and we can also use multiple Microinverters in the
form of a single-phase grid to achieve a three-phase grid.
For more information, please see the Technical Data page (P17~20) of this manual.
Model Number
AC Grid
Max. # Per Branch
SUN300G3-EU-230
50/60Hz, 230 V
17 for 45A breaker
SUN500G3-EU-230
50/60Hz, 230 V
10 for 45A breaker
SUN600G3-EU-230
50/60Hz, 230 V
8 for 45A breaker
SUN800G3-EU-230
50/60Hz, 230 V
6 for 45A breaker
SUN1000G3-EU-230
50/60Hz, 230 V
5 for 45A breaker
SUN1300G3-EU-230
50/60Hz, 230 V
4 for 45A breaker
SUN1600G3-EU-230
50/60Hz, 230 V
4 for 45A breaker
SUN1800G3-EU-230
50/60Hz, 230 V
3 for 45A breaker
SUN2000G3-EU-230
50/60Hz, 230 V
3 for 45A breaker
4. MICROINVERTER SYSTEM INSTALLATION
A PV system using Microinverters is simpleto install. Each Microinverter easily mounts onthe PV racking,
directly beneath the PV module(s). Low voltage DC wires connect from the PV module directly to the
Microinverter, eliminating high DC voltage risk. Installation MUST comply with local regulations and
technical rules.
Special Statement! An AC Ground-Fault Circuit Interrupter (GFCI) should not be used to protect the
dedicated circuit to the Microinverter even though it is an outside circuit. None of the small GFCI devices
(5~30mA) are designed for back feeding and will be damaged if back feeding occurs. In a similar manner,
AC Arc-Fault Circuit Interrupter (AFCI) have not been evaluated for back feeding and may be damaged
if back feed occurs with the output of a PV inverter.
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4.1. ADDITIONAL INSTALLATION COMPONENTS
◼AC Male and Female Interconnection Connectors (sold separately)
◼Sealing end caps (sold separately)
4.2. REQUIRED PARTS AND TOOLS (USER SUPPLIED)
◼An AC connection junction box
◼Mounting hardware suitable for module racking
◼Sockets and wrenches for mounting hardware
◼Continuous grounding conductor and grounding washers
◼A Phillips screwdriver
◼A torque wrench
5. INSTALLATION PROCEDURES
Step 1 –Install the AC branch circuit junction box
Figure 3 - Installing the AC branch circuit junction box.
WARNING:
◼Perform all electrical installations in accordance with local electrical codes.
◼Be aware that only qualified professionals should install and/or replace Microinverters.
◼Before installing or using a Microinverter, please read all instructions and warnings in the technical
documents, as well as on the Microinverter system itself and the PV array.
◼Be aware that the installation of this equipment includes the risk of electric shock.
◼Do not touch any live parts in the system, including the PV array, when the system has been
connected to the electrical grid.
NOTE:
Strongly recommend installing Surge Protection Devices in the dedicated meter box.
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◼Install an appropriate junction box at a suitable location on the PV racking system (typically at the end
of a branch of modules).
◼Connect the open wire end of the AC cable into the junction box using an appropriate gland or strain
relief fitting.
◼Wire the conductors of the AC(230/400Vac): L - red; N - black; PE - yellow-green.
◼Connect the AC branch circuit junction box to the point of utility Interconnection.
Step 2 –Attach the Microinverters to the racking or the PV module frame
a) Mark the location of the Microinverter on the rack, with respect to the PV module junction box or any
other obstructions.
b) Mount one Microinverter at each of these locations using hardware recommended by your module
racking vendor.
Figure 4 - 300G3/500G3 (1MPPT) and 600G3/800G3/1000G3 (2MPPT) mounting.
Figure 5 - 1300G3/1600G3/2000G3 (4MPPT) mounting.
WARNING:
Wiring colour codes can be different according to local regulations. Check all the wires of the
installation before connecting to the AC cable to be sure they match. Wrong cabling can damage the
microinverters irreparably. The warranty does not cover such an issue.
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Step 3 –Connect the microinverters in parallel
Figure 6 –300G3/500G3 (1MPPT) and 600G3/800G3/1000G3 (2MPPT) connect in parallel.
Figure 7 –1300G3/1600G3/2000G3 (4MPPT) connect in parallel.
a) Check the Microinverter technical data in Page 5 for the maximum allowable number of Microinverters
on each AC branch circuit.
b) Plug the male AC connector of the Microinverter into the female connector to get it connected.AC
connector interface as follows.
WARNING:
Prior to installing any of the microinverters, verify that the utility voltage at the point of common
connection matches the voltage rating on the microinverter label.
WARNING:
Do not place the inverters (including DC and AC connectors) to be exposed to the sun, rain or snow,
and this includes the gap between modules. Allow a minimum of 3/4 (1.5cm.) between the roof and
the bottom of the Microinverter to allow proper airflow.
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Figure 8 - L, N, and PE connections.
Step 4 –Install an AC cable protective end cap at the end of the AC cable
Figure 9 - Installing AC protective end cap.
Step 5 –Connect the microinverter to the PV modules
Figure 10 - Connecting the microinverter to the solar modules.
WARNING:
DO NOT exceed the maximum number of microinverters in an AC branch circuit, as displayed on
Page 5 of this manual.
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6. MICROINVERTER SYSTEM OPERATING INSTRUCTIONS
To operate the microinverter PV system:
1. Turn ON the AC circuit-breaker on each microinverter AC branch circuit.
2. Turn ON the main utility-grid AC circuit-breaker. Your system will start producing power after a one-
minute waiting time.
3. The units should start blinking red one minute after turning on the AC circuit-breaker. Then blue led
blinking. This means they are producing power normally. The faster blinking of the blue led means
more power generated.
4. Configure the internal WIFI module according to its user manual.
5. The Microinverters will start to send performance data over WIFI module to the network every 5
minutes. It enables customers to monitor the performance data of each Microinverter through a
website and APP.
7. TROUBLESHOOTING
Qualified personnel can use the following troubleshooting steps if the PV system does not operate
correctly.
7.1. STATUS INDICATIONS AND ERROR REPORTING
◼Startup LED
One minute after DC power is first applied to the Microinverter, one short red blink indicates a successful
microinverter startup sequence, be equal or greater than two short red blinks after DC power is first
applied to the microinverter indicate a failure during microinverter setup.
NOTE:
When plugging in the DC cables, if AC is already available, the microinverter should immediately blink
red light and start work within the set time (default 60 seconds). If AC is not available, the red light will
blink 3 times quickly and repeat after one second until AC is connected.
NOTE:
When AC power is applied but the Microinverter has not started up, about 0.1A current and 25VA(W)
power for each Microinverter may be measured by a power meter. This power is ‘reactive power’, not
consume from the utility grid.
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◼Operation LED
Flashing Slow Blue - Producing small power
Flashing Fast Blue - Producing big power
Flashing Red - Not producing power
Red blinking two times - AC low-voltage or high-voltage
Red blinking three times - Grid failure
◼GFDI Error
A red LED bilking for indicates the Microinverter has detected a Ground Fault Detector Interrupter (GFDI)
error in the PV system. Unless the GFDI error has been cleared, the LED will remain four times blinking.
◼Other Faults
All other faults can be reported to the website and APP.
7.2. TROUBLESHOOTING A NON-OPERATING MICROINVETER
There are two possible overall areas of trouble:
a) The Microinverter itself may be having problems.
b) The Microinverter itself is working fine, but the communication between Microinverter and network has
a problem. The items below refer to Microinverter issues, not communication issue.
A quick way to tell whether the issue is the Microinverter or the communication problem:
1. Diagnosing from the Microinverter: A red LED either blinking or constant on the Microinverter, or no
light at all means it is definitely the Microinverter problem.
2. 0 watts, or 2 watts: possibly a Microinverter problem
Diagnosing from the network:
1. No-Data-Display: The website and APP does not display any data. Check the network configuration.
2. Only display microinverter is online but no data. This may be because the server is updating
To troubleshoot a non-operating Microinverter, follow the steps below in order:
1. Verify the utility voltage and frequency are within ranges shown in the Technical Data section of this
manual.
2. Check the connection to the utility grid. Disconnect AC firstly, then disconnect DC and make sure the
utility grid voltage can be measured at AC connector. Never disconnect the DC wires while the
Microinverter is producing power. Re-connect the DC module connectors and watch for three short
LED flashes.
WARNING:
Never disconnect the DC wire connectors under load. Ensure that no current is flowing in the DC
wires prior to disconnecting. An opaque covering may be used to cover the module prior to
disconnecting the module.
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3. Check the AC branch circuit interconnection between all the microinverters. Verify each inverter is
energized by the utility grid as described in the previous step.
4. Make sure that any AC breaker is functioning properly and are closed.
5. Check the DC connections between the Microinverter and the PV module.
6. Verify the PV module DC voltage is within the allowable range shown in the Technical Data of this
manual.
7. If the problem still persists, please contact technical support.
8. REPLACEMENT
Follow the procedure below to replace a failed Microinverter:
a) Disconnect the Microinverter from the PV Module, in the order shown below:
1. Disconnect the AC by turning off the branch circuit-breaker.
2. Disconnect the AC connector of the microinverter.
3. Cover the module with an opaque cover.
4. Disconnect the PV module DC wire connectors from the Microinverter.
5. Remove the Microinverter from the PV array racking.
b) Remove the opaque cover and install a replaced Microinverter to the bracket.
Remember to observe the flashing LED light as soon as the new Microinverter is plugged into the DC
cables.
c) Connect the AC cable of the replacement Microinverter.
9. TECHNICAL DATA
WARNING:
Do not attempt to repair the Microinverter. If troubleshooting methods fail, please call for Technical
Support.
WARNING:
◼Be sure to verify the voltage and current specifications of your PV module match with those of the
Microinverter. Please refer to the datasheet or user manual.
◼You must match the DC operating voltage range of the PV module with the allowable input voltage
range of the Microinverter.
◼The maximum open-circuit voltage of the PV module must not exceed the specified maximum input
voltage of the inverter.
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300G3/500G3/600G3 Specification:
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800G3/1000G3 Specification:
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1000G3/1300G3/1600G3/1800G3/2000G3 Specification:
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10. WIRING DIAGRAMS
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