Sunways STT Series User manual

SUNWAYS TECHNOLOGIES CO., LTD.
Grid-connected Inverter
STT 4~25KTL
User Manual
AU

CONTENTS
1 Preface ……………………………………………………… 5
1.1 Overview …………………………………………………………………………5
1.2 Target Groups ……………………………………………………………………5
2 Safety Instructions ……………………………………… 6
2.1 Safety Notes ………………………………………………………………………6
2.2 Statement …………………………………………………………………………6
2.3 Important Safety Matters ………………………………………………………7
2.4 Symbols Explanation ……………………………………………………………8
3 Product Description ……………………………………… 11
3.1 Basic Features ………………………………………………………………… 11
3.2 Physical Layout ……………………………………………………………… 12
3.3 Display Interface ……………………………………………………………… 14
3.4 Packing List …………………………………………………………………… 15
4 Installation ………………………………………………… 18
4.1 Location ……………………………………………………………………… 18
4.2 Mounting ……………………………………………………………………… 20
4.3 External ground connection ……………………………………………… 23
4.4 Electrical Connection ……………………………………………………… 24
4.5 Monitoring Device Installation …………………………………………… 31
4.6 Meter/RS485/DRED Connection …………………………………………… 32
5 Start and Stop ……………………………………………… 36
5.1 Start the Inverter …………………………………………………………… 36
5.2 Stop the Inverter ……………………………………………………………… 36
6 General Operation ………………………………………… 37
6.1 Display Operation …………………………………………………………… 37
6.2 Country Code (Safety Code) Setting ……………………………………… 38
6.3 AC Output Boost for STT-15KTL(-P) Inverter …………………………… 39
6.4 Power Quality Response Modes …………………………………………… 40
6.5 Grid Protection settings …………………………………………………… 41
6.7 Power rate limit setting ……………………………………………………… 42
6.8 Export Limit and Generation Limit ………………………………………… 43
6.9 Online Monitoring APP ……………………………………………………… 45
7 Troubleshooting …………………………………………… 46
7.1 Error Message ………………………………………………………………… 46
7.2 PV System for Ground Faults ……………………………………………… 50
7.3 Maintenance ………………………………………………………………… 50
8 Technical Parameters …………………………………… 51

4 5
Attention
The products, services or features purchased are subject to the commercial contracts
and terms of Sunways technologies Co., Ltd. All or part of the products, services
or features described in this document may not be within purchased. Unless
otherwise agreed in the contract, the Company shall not make any express or implied
declaration or guarantee of the contents of this document.
Due to product version upgrades or other reasons, the contents of this document will
be updated periodically. Unless otherwise agreed, this document serves only as a
guide to use, and all statements, information and recommendations in this document
do not constitute any express or implied guarantee.
1 Preface
※ 1.1 Overview
This manual is an integral part of Sunways STT 4-25kW series three-phase inverters
(hereinafter referred to as the inverter). It mainly introduces the assembly, installation,
electrical connection, maintenance and troubleshooting of the products. Before
installing and using the inverter, please read this manual carefully, understand the safety
information and be familiar with the functions and characteristics of the inverter.
※ 1.2 Target Groups
This manual is applicable to the electrical installers with professional quali󽗉cations and
end-users. If there are any problems in the installation process, please call Sunways
service telephone at [phone] or email Sunways at [e-mail]
for consultation.
1 PrefaceAttention

6 7
2 Safety Instructions
2 Safety Instructions2 Safety Instructions
※ 2.1 Safety Notes
① Before installation, please read this manual carefully and follow the instructions in this
manual strictly.
②Installers need to undergo professional training or obtain electrical related professional
quali󽗉cation certi󽗉cates.
③ When installing, do not open the front cover of the inverter. Apart from performing
work at the wiring terminal (as instructed in this manual), touching or changing
components without authorization may cause injury to people, damage to inverters and
annulment of the warranty.
④ All electrical installations must conform to local electrical safety standards.
⑤ If the inverter needs maintenance, please contact the local designated personnel for
system installation and maintenance.
⑥ To use this grid-connected inverter for power generation needs the permission of the
local power supply authority.
⑦ The temperature of some parts of the inverter may exceed 60° C during operation. To
avoid being burnt do not touch the inverter during operation. Let it cool before touching
it.
⑧ When exposed to sunlight, the PV array generates dangerous high DC voltage. Please
operate according to our instructions, or it will result in danger to life.
⑨ The product is to be installed in a high tra󽗋c area where the fault is likely to be seen.
※ 2.2 Statement
Sunways Technologies Co.,Ltd. has the right not to undertake quality assurance in any of
the following circumstances:
① Damages caused by improper transportation.
② Damages caused by incorrect storage, installation or use.
③ Damages caused by installation and use of equipment by non-professionals or
untrained personnel.
④ Damages caused by failure to comply with the instructions and safety warnings in this
document.
⑤ Damages of running in an environment that does not meet the requirements stated in
this document.
⑥ Damages caused by operation beyond the parameters speci󽗉ed in applicable technical
speci󽗉cations.
⑦ Damages caused by unauthorized disassembly, alteration of products or modi󽗉cation
of software codes.
⑧ Damages caused by abnormal natural environment (force majeure, such as lightning,
earthquake, 󽗉re, storm, etc.).
⑨ Any damages caused by the process of installation and operation which don't follow
the local standards and regulations.
⑩ Products beyond the warranty period.
※ 2.3 Important Safety Matters
Table below shows the symbols that may appear in this document and their de󽗉nition:
Danger
Dangerous situation, if not avoided, it could result in death or serious personal injury.
Warning
Potentially dangerous situation, if not avoided, may result in death or serious personal
injury.
Caution
Potentially dangerous situation, if not avoided, may result in moderate or minor personal
injury.

8 9
※ 2.4 Symbols Explanation
This chapter mainly elaborates the symbols displayed on the inverter, nameplate and
packing box.
Attention
The safety warning information about equipment or environment, to prevent equipment
damage, data loss, equipment performance degradation or other unpredictable results.
Note
Symbol highlights important information, best practices and tips, etc.
2.4.1 Symbols on the Inverter
2.4.2 Symbol on the Inverter nameplate
Inverter status indicator.
Inverter running indicator.
Grounding symbol, the inverter casing needs to be properly grounded.
The inverter cannot be disposed of with household waste.
Please read the instructions carefully before installation.
Do not touch any internal parts of the inverter until 5 min after being disconnected from
the mains and PV input.
CE mark, the inverter complies with the requirements of the applicable CE guidelines.
TUV certi󽗉cation.
Danger. Risk of electric shock!
The surface is hot during operation and no touch is allowed.
2 Safety Instructions2 Safety Instructions

10 11
Figure 3-1 Applicable grid types
Electric shock hazard, live parts, risk of electric shock, do not touch.
2.4.3 Symbol on the Packing box
Handle with care.
This side up.
Keep dry.
Stacked layers.
3 Product Description
3 Product Description
※ 3.1 Basic Features
3.1.1 Function
The Sunways STT 4-25kW series inverter is a three-phase grid-connected PV inverter which used to
e󽗋ciently convert the DC power generated by the PV string Into AC power and feed it into the grid.
3.1.2 Models
The STT 4-25kW series inverter includes 20 models which are listed below:
STT-4KTL, STT-5KTL, STT-6KTL, STT-8KTL, STT-10KTL, STT-12KTL, STT-15KTL, STT-17KTL, STT-20KTL, STT-25KTL
STT-4KTL-P, STT-5KTL-P, STT-6KTL-P, STT-8KTL-P, STT-10KTL-P, STT-12KTL-P, STT-15KTL-P, STT-17KTL-P,
STT-20KTL-P, STT-25KTL-P
3.1.3 Applicable grid type
The applicable grid types for the Sunways STT 4-25kW series are TN-S, TN-C, TN-C-S, IT and TT. When
applied to the TT grid, the voltage of N to PE should be less than 30V.For more details please see Figure3-1:
2 Safety Instructions
Sunways
STT Series
TN-S
Transformer
Sunways
STT Series
TN-C
Transformer
Sunways
STT Series
TN-C-S
Transformer
Sunways
STT Series
TT
Transformer
Sunways
STT Series
IT
Transformer

12 13
Figure 3-4 Bottom view
3.2.3 Inverter Bottom View
3 Product Description 3 Product Description
Wiring terminals are at the bottom of the inverter, as shown in the table below.
Item Terminal Note
1 DC Input terminal PV connector
2 COM 1 Port WiFi/LAN/GPRS/4G device connector
3 COM 2 Port RS485/DRED connector
4 AC Output Terminal Used for AC output cable connection
3.1.4 Storage conditions
① Inverter must be stored in its original packaging.
② The storage temperature and humidity should be in the range of -30℃ and+ 60℃ , and
less than 90%, respectively.
③ If a batch of inverters needs to be stored, the height of each pile should be no more
than 6 levels.
※ 3.2 Physical Layout
Figure 3-2 Front view
3.2.1 Inverter front view
3.2.2 Inverter side view
Figure 3-3 Side view
Logo
Display
550mm
410mm
410mm
175mm
Name
Plate
175mm
DC Switch Com2 Port
(Optional)
DC Input Terminal
Back Rail
Com1 Port
AC Output Terminal
Figure 3-5 Inverter back view
3.2.4 Inverter back view
Back Rail
Vent Valve
COM2-1
COM2-2
COM1

14 15
※ 3.3 Display Interface
※ 3.4 Packing List
The package of the inverter includes the following accessories. Please check whether the
accessories in the packing box are complete when receiving the goods. See Figure 3-7 for
the packing list.
Item Indicator Status Description
1Power
Indicator
O󽗈 No input voltage detected or input voltage is too low.
Slow 󽗊ashing Inverter powered on, waiting for the grid connection.
Quick 󽗊ashing Inverter detected grid power and entered self-test status.
On Normal, grid-connected and power generated.
2Alarm
Indicator
On An alarm or faults detected, specific fault information can be
viewed from the display.
O󽗈 The inverter is running normally.
Slow 󽗊ashing The monitoring device is not connected to the router or is not
connected to internet.
Quick 󽗊ashing The monitoring device is connected to the router or connected to
internet but not connected to the server.
sunways
Item Indicator Status Description
3OLED
Display
On Display the inverter operating information.
O󽗈 If the button pressed without any response, the screen is faulty or
not well connected.
4 Button Physical button Switch OLED display information and set parameters by short
press and long press.
Figure 3-6 Display interface Inverter×1 Wall Bracket×1
Expansion Bolt×5 3Pin Terminal×1 ①
3 Product Description 3 Product Description

16 17
3 Product Description
Figure 3-7 Packing list
Inspection
Report
User
Manual
Quick
Guide
User Guide
PV Terminal×2 Monitoring Device×1(Optional)
AC Terminal×1 Ground Terminal×1
6Pin Terminal×1
②
Note
① Export limitation & control version 2pcs; RS485 and DRED version 1 pcs (This connector
already pre-installed inside the inverter).
② STT 4-12kW 2pcs / STT 15kW 3pcs / STT 17-25kW 4pcs.
③ DRED version only (This connector already pre-installed inside the inverter).
③
3 Product Description

18 19
Figure 4-1 Recommended installation location
4 Installation
4 Installation
※ 4.1 Location
The Sunways STT 4-25kW series inverters designed with IP65 protection enclosure for
indoor and outdoor installations. When selecting an inverter installation location, the
following factors should be considered:
① The wall on which the inverters mounted must be able to withstand the weight of the
inverter.
② The inverter needs to be installed in a well-ventilated environment.
③ Do not expose the inverter directly to strong sunlight to prevent excessive temperature
operation. The inverter should be installed in a place with shelter to prevent direct
exposure to sunlight and rain.
④ Install the inverter at eye level for easy inspection of screen data and further
maintenance.
⑤ The ambient temperature of the inverter installation location should be between -30℃
and 60℃ .
⑥ The surface temperature of the inverter may reach up to 75℃ . To avoid risk of burns,
do not touch the inverter while it's operating and inverter must be installed out of
reaching of children.
4.1.1 Installation location
Recommended installation location of the inverter, as shown in Figure 4-1:
Warning
Do not put 󽗊ammable and explosive articles around the inverter.
Figure 4-3 Recommended installation angle
4 Installation
4.1.2 Installation Spacing
Figure 4-2 Recommended installation spacing
4.1.3 Installation Angle
The requirements for inverter installation spacing are shown in Figure 4-2:
The installation angle of the inverter is recommended as shown in Figure 4-3:
500mm 500mm
500mm
500mm
300mm
300mm 300mm

20 21
※ 4.2 Mounting
4.2.1 Wall bracket installation
Dimensions of wall bracket, see Figure 4-4:
Figure 4-4 Dimensions of wall bracket
① Use the wall bracket as the template to mark the position of 5 holes on the wall. See
Figure 4-5 for details:
Figure 4-5 Marking hole position using installation bracket
② Bracket assembly
Prepare the two M5 screws and L-shaped plate in the accessory bag, then 󽗉x the L-shaped
plate to the mounting bracket.
Figure 4-6 Bracket assembly
③ Use an electrical driller with 10mm diameter bit to drill 5 holes in the wall with 80mm depth.
Warning
Before drilling, make sure to avoid any buried water tube and electric wires in the wall.
④ Insert the expansion tubes into the holes and tighten them, then 󽗉x the bracket onto
the wall with expansion screws by using a cross screwdriver, as shown in Figure 4-7:
Figure 4-7 Fixing the wall bracket
150mm
300mm
150mm
150mm150mm
4 Installation4 Installation

22 23
Lift the inverter, hang the back rail on the 󽗉xed wall bracket carefully. Screws the inverter to
the L-shaped plate (The lock is purchased separately). See Figure 4-8 for details:
4.2.2 Mounting the inverter
Figure 4-8 Mounting the inverter
※ 4.3 External ground connection
Ground terminal connection steps:
① The external grounding terminal is located in the lower right side of the inverter.
② Fix the grounding terminal to the PE wire with a proper tool and lock the grounding
terminal to the grounding hole in the lower right side of the inverter, as shown in Figure
4-9.
③ The cross-sectional area of the external grounding cable is 4mm2.
Danger
Do not connect the N-wire as a protective ground wire to the inverter casing. Otherwise,
it may cause electric shock.
Attention
Good grounding is good for resisting surge voltage shock and improving EMI
performance. Inverters must be well-grounded.
For a system with only one inverter, the PE cable needs to be grounded.
For a multi-inverter system, all inverters PE wires need to be connected to the same
grounding copper bar to ensure equipotential bonding.
Figure 4-9 Grounding terminal connectio
4 Installation4 Installation

24 25
2.DC connector assembly procedure
① Select the appropriate photovoltaic cable:
Cable type Traverse area (mm²)
General photovoltaic
cable
Range (mm2) Recommended value (mm2)
2.5-4.0 4.0
Figure 4-10
② Peel o󽗈 the DC cable insulation sleeve for 7 mm, as shown in Figure 4-10:
Wire Traverse area 2.5-4mm27mm
③ Disassemble the connector in the accessory bag, as shown in Figure 4-11:
④ Insert the DC cable through the DC connector nut into the metal terminal and press the
terminal with a professional crimping plier (pull back the cable with some power to check if
the terminal is well connected to the cable), as shown in Figure 4-12:
Figure 4-11
+
-
※ 4.4 Electrical Connection
Danger
A high voltage in the conductive part of the inverter may cause an electric shock. When
installing the inverter, make sure that the AC and DC sides of the inverter are completely
de-energized.
Warning
Do not ground the positive or negative pole of the PV string, otherwise it will cause
serious damage to the inverter.
Warning
Static may cause damage to the electronic components of the inverter. Anti- static
measures should be taken during installation and maintenance.
Attention
Do not use other brands or other types of terminals other than the terminals in the
accessory package. Sunways has the right to refuse all damages caused by the mixed-
use of terminals.
Attention
Moisture and dust can damage the inverter, ensure the cable gland is securely tightened
during installation. The warranty claim will be invalidated if the inverter is damaged as a
result of a poorly connected cable connector.
1. The following must be considered when making electrical connections to the inverter:
① Disconnect the AC breaker switch on the grid side.
② The DC switch of the inverter must be turned to the "OFF" position.
③ For best practice, ensure PV modules of the same model and specifications are
connected in each string.
④ Make sure the maximum output voltage of each PV string does not exceed 600V.
4.4.1 Inverter PV string connection
4 Installation4 Installation

26 27
⑤ Insert the positive and negative cables into the corresponding positive and negative
connectors, pull back the DC cable to ensure that the terminal is tightly attached in the
connector.
⑥ Use an open-end wrench to screw the nut to the end to ensure that the terminal is well
sealed, as shown in Figure 4-13:
3. Insert the positive and negative connectors into the inverter DC input terminals
respectively, a click sound should be heard if the terminals are well connected, as shown
in Figure 4-14:
Figure 4-13
Open-end Wrench
Warning
① Before assembling the DC connector, make sure that the cable polarity is correct.
② Use a multimeter to measure the voltage of the DC input string, verify the polarity of
the DC input cable, and ensure that each string voltage is within 1000V.
4. Seal the unused PV terminals with the terminal caps.
Figure 4-14
COM2-1
COM2-2
COM1
4.4.2 Connection of AC output
Before connecting to the power grid, make sure that the power grid voltage and
frequency meet the requirements of the inverter. See technical parameters for details.
All Sunways inverters incorporate internal RCD (Residual Current Device) to protect
against possible electrocution in case of a malfunction of the PV array, cables or inverter
(DC). The RCD in the Sunways inverter can detect leakage on the DC side. An external RCD
is required in some countries. The installer must check which type of RCD is required by
the speci󽗉c local electric codes. Installation of an RCD must always be conducted in
accordance with local codes and standards. Sunways recommends the use of a type-A
RCD, with a tripping current of 300mA or higher.
The recommended cable and AC switch for the Sunways STT 4-25kW series three phase
inverter are shown in the following table:
Model STT-4K STT-5K STT-6K STT-8K STT-10K STT-12K STT-15K STT-17K STT-20K STT-25K
Coper
Cable
2.5-10
mm2
2.5-10
mm2
2.5-10
mm2
4-10
mm2
4-10
mm2
4-10
mm2
6-10
mm2
8-10
mm2
8-10
mm2
8-10
mm2
Breaker 20A 20A 20A 20A 32A 32A 32A 40A 40A 50A
Figure 4-12
Crimping Plier
4 Installation4 Installation

28 29
Warning
An AC breaker must be connected on the AC side of the inverter.
Any loads cannot be connected to the inverter without the AC breaker.
1. AC connector connection steps
① Take the AC connector out of the accessory bag and disassemble it, as shown in Figure
4-15:
Figure 4-15
Cable Gland Threaded Sleeve AC Terminal Head
Figure 4-16
Figure 4-17
③ Insert the stripped end of the 󽗉ve wires into the appropriate hole of the terminal head
by following the rules: yellow green wire to PE port, red or brown 󽗉re wires to L ports (no
requests for the sequence of three 󽗉re wires), and blue or black wire to the N port. Please
try to pull out the cable to make sure it is well connected. As shown in Figure 4-17:
② According to the table above, select an appropriate cable, peel the insulation sleeve
of AC cable o󽗈 for 50mm, and peel o󽗈 the end of 3L /PE / N wires for 8mm, as shown in
Figure 4-16:
Strip Length:8mm
50mm
Wire Diameter:13-18mm
Allen Key
4 Installation4 Installation

30 31
④ According to the arrow direction push the threaded sleeve to make it connected with
the AC terminal head and then rotate the cable gland clockwise to lock it, as shown in
󽗉gure 4-18:
Figure 4-18
Figure 4-19 Connect the AC connector
2. Connect the AC connector to the inverter AC terminal, and rotate the AC connector
buckle clockwise until its tight enough. As shown in 󽗉gure 4-19:
※ 4.5 Monitoring Device Installation
Sunways STT 4-25kW series three phase inverter supports WIFI, GPRS, LAN, 4G and RS485
communication.
Plug the WIFI, LAN, 4G or GPRS module into the COM1 port in the bottom of inverter (as
shown in Figure 4-20). A slight "click" sound during the installation represents that the
assembly is in place.
Note
1. The 4G and GPRS version module does not need to be con󽗉gured.
2. The WiFi version module needs to be con󽗉gured to the router for the 󽗉rst installation. If
the router name or password are changed, the WiFi dongle will need to be recon󽗉gured.
For details, please refer to the [QUICK INSTALLATION GUIDE] which is attached to the
accessory bag.
3. If DHCP is enabled on the router, the LAN version module does not need to be
configured. Otherwise, please refer to the [QUICK INSTALLATION GUIDE] which is
attached to the accessory bag.
Attention
Do not touch the waterproof plug in the card slot except for replacing the SIM card.
In that case, please make sure the card slot is completely sealed by the weatherproof
plug after replacing the SIM card. Any damages caused by improper waterproof plug
placement, will void warranty.
Figure 4-20 Monitoring device installation
COM2-1
COM2-2
COM2-1
COM2-2
COM1
4 Installation4 Installation

32 33
※ 4.6 Meter/RS485/DRED Connection
Figure 4-21
Note
Port 1 Port 2 Port3
Meter Port RS485 Port DRED Port
① This port is available on export limitation & control, RS485 and DRED versions of the
inverter only.
② The Pin connector in inverter Port1 and Port2 may vary from 2Pin to 3pin according to
the shipment version.
Inverter communication ports are located at the behind of the COM2 plate at the bottom
and include RS485 port (used for Meter or Datalogger connection), and DRED port, as
shown in Figure 4-21:
4.6.1 Terminals de󽗉nition
1 1
1
3
5
2 2
3 3
2
4
6
Port 1 Port 2
Port 3
COM2-1
COM2-2
Di󽗈erent versions of the inverter have di󽗈erent terminals, which are de󽗉ned as follows:
Port Function NO. De󽗉nition
Port1
① Only Export limitation & control
version with this port.
② Connect external Meter (with 3CTs)
to activate the Export Limitation &
control function on Sunways STT
series inverter.
1 RS485 A
2 RS485 B
3 PE/NULL
Port 2
① Export limitation & control/RS485/
DRED version with this port.
② ln case of multiple inverters, all the
inverters can be daisy-chained via
RS485 cables.
1 RS485 A
2 RS485 B
3 PE/NULL
Port 3
① Only DRED version with this port.
② DRED means demand response
enable device. The AS/NZS 4777.2:2020
requires inverters to support demand
response mode (DRM). This function
is for inverters that comply with AS/
NZS4777.2:2020 standard.
③ Sunways inverter is fully compliant
with all DRM. The 6pin connector is
used for DRM connection.
④ Support DRM command: DRM0,
DRM5, DRM6, DRM7, DRM8.
1 COM/DRM0
2 REFGEN
3 DRM4/8
4 DRM3/7
5 DRM2/6
6 DRM1/5
STT series three-phase inverter supports multiple inverters daisy-chain connection to a
data logger via RS485 communication.
Multiple inverters connection diagram as shown in Figure 4-22:
4.6.2 RS485 Communication
4 Installation4 Installation

34 35
The maximum distance between the inverter at the end of the daisy chain and the Data
logger should be within 1000m.
Any further di󽗋culties in export limitation & control or generation limit solution, wiring
instructions and con󽗉guration, please contact Sunways after-sales at service@sunways-
tech.com.
① Remove the COM2 plate in the bottom of the inverter with a cross screwdriver.
② Put the cable through the connector and connect to the terminal in the following
order: screw cap, sealing ring, insulator, metal plate, nut and 3/6pin connector, as shown
in Figure 4-23:
Figure 4-22
Attention
It is recommended to use the RS485 communication cable with a cross sectional area of
0.75-1.5mm and an outer diameter of 5mm-10mm.
RS485 cable requirements: Shielded twisted-pair cable or shielded twisted Ethernet
cable.
4.6.3 Export limitation & control or generation limit solution
4.6.4 Wiring Steps:
STT 4~25KTL
series inverter STT 4~25KTL series inverter STT 4~25KTL series inverter
Data logger
Sunways server
InternetInternet
LAN/WiFi
/GPRS RS485 RS485 RS485
Router
...
2
Figure 4-23
Figure 4-24
③ Insert the cable to the port in the 3/6pin connector and fasten with a screwdriver.
④ Insert the 3/6pin connector into the 3/6pin connecter inside the inverter, and screw the
COM2 plate back with a cross screwdriver, as shown in Figure 4-24:
20-25mm
1
3
3
1
2
4
6
2
2
1
3
5
Port 1
Port 2
Port 3
6mm
6mm
20-25mm
Screw cap
Sealing ring
Insulator ring
Metal plate
3/6pin connector
Nut
COM2-1
COM2-1
4 Installation4 Installation

36 37
5 Start and Stop
5 Start and Stop
※ 5.1 Start the Inverter
When starting the inverter, follow these steps:
① Turn on the AC breaker 󽗉rst (close the AC circuit breaker).
② Turn on the DC switch in the bottom. If the PV string voltage higher than the inverter
start-up voltage, the inverter will start.
③ When both AC and DC power supply are normal, the inverter is ready to start. The
inverter will initiate checking its internal parameters and grid parameters, if it is within
the range, the green light on the left side of the screen begins to 󽗊ash, and the “Waiting”
message will be displayed on the OLED display.
④ After self-checking completed, the inverter will start generating electricity, the green
light will remain on, and the OLED display will display real-time power information.
※ 5.2 Stop the Inverter
When turning o󽗈 the inverter, please follow the steps below:
① Turn o󽗈 the AC breaker 󽗉rst.
② Wait 30 seconds and then turn the DC switch to the “OFF” position. At this time,
there is remaining power in the inverter capacitor. Wait for 5 minutes until the inverter is
completely de-energized before conducting any work on the inverter.
③ Disconnect the AC and DC cables.
6 General Operation
※ 6.1 Display Operation
When the inverter is turned on, the following interfaces will be displayed on the OLED
display, and the OLED display allows the user to check various operation information and
to modify the settings of the inverter. Please refer to the following display operation 󽗊ow
for details:
6 General Operation
6.1.1 Main Window and General Setting
Short press(1s), switch window
Long press(3s), enter the lower menu
Setting Setting Setting Setting
Main Window
Waiting NormalChecking Fault info Firmware
Updating
PV Voltage
PV Current
Grid Voltage
Grid Current
Grid Freq
Re-
Connect
Sys
CtrlMode
Time Set
Modbus
Addr
Setting
Setting Setting
LAN
setting
WIFI
setting
RSSI
Not WiFi/LAN
E-Day
CT Ratio
OverLoad
(AU)
Language
Set
E-Total
Grid Connect
Type Set
Power
Rate Limit
Export Limit
On/O󽗈
XXX%
H-Total
Power
Factor
Power Rate
Limit
XXX%Pn/min
Model
Name
Feed in
Grid
Generation
Limit
XXX%
General
Settings
Export
Limit
Advanvced
Settings
Safety
Set
Setting Setting Setting Setting Setting Setting Setting
OROR
SN/FM
Version
System
Info
Error
Message
Fault Info
Generation
Limit

38 39
6 General Operation
6.1.2 LAN/WIFI Setting
Note
Please wait for 10 seconds and the inverter will automatically save your settings or
modi󽗉cations.
※ 6.2 Country Code (Safety Code) Setting
Please set "Country code (Safety code)" under the menu "Safety Set" in "Advanced Settings".
Please follow this 󽗊ow chart to set "Country code (Safety code)":
The country grid code and region settings are password protected. User should be able to view
but not edit the country codes. If you are installer, please contact importer for password. You
can also call Sunways service telephone at [phone] or email Sunways at service@
sunways-tech.com for password.
Note
For compliance with AS/NZS 4777.2:2020, please select from Region A/B/C New Zealand.
Please contact your local grid operator for which region to select.
※ 6.3 AC Output Boost for STT-15KTL(-P) Inverter
The maxium output power of the residencial three-phase solar system is 15kVA in most of
the states in Australia. Check the local DNSPs or authorities if they allow AC output more
than 15kVA .
Note
① Advanced settings can only be changed by qualified professionals with relevant
cert󽗉cations.
② Check requirements with local NSP before activating 10% AC output boost.
③ Only STT-15KTL(-P) has the option to enable/disable the 10% AC output boost.
④ The default password to access the advanced settings is 1111,applicable to all on-grid
inverters.
6 General Operation
Short press(1s), switch window
Long press(3s), enter the lower menu
Short press(1s), switch window
Long press(3s), enter the lower menu
Main
Window
How to view
General
Settings Safety Code
Main
Window Advanced Settings Password Veri󽗉ed OK Safety Set
Setting
Please follow this 󽗊ow chart to enable 10% AC output boost:
Short press(1s), switch window
Long press(3s), enter the lower menu
LAN Reset
WIFI
Reset
DHCP Set
WIFI
Reload
IP Address Gateway
Address Subnet Mask DNS Address
Setting
Setting
Setting
Setting
Setting Setting Setting Setting
DHCP ON
OR OR