Sunways STH-4K-HT User manual

1
Three-phase High-voltage
Hybrid Inverter
STH-4K/5K/6K/8K/10K/12KTL-HT
User Manual
Ningbo Sunways Technologies Co., Ltd.

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CONTENTS
1.Preface ........................................................................................................................5
1.1 Overview .......................................................................................................5
1.2 Target Groups ...............................................................................................5
2.Safety Instructions ................................................................................................5
2.1 Safety Notes ................................................................................................. 5
2.2 Statement ..................................................................................................... 6
2.3 Important Safety Matters ............................................................................6
2.4 Symbols Explanation ................................................................................... 7
3. Product Introduction ..........................................................................................9
3.1 Basic Features .............................................................................................. 9
3.2 Appearance Introduction ..........................................................................14
3.3 Display Interface ........................................................................................16
3.4 Packing List .................................................................................................17
4. Product Installation ...........................................................................................18
4.1 Selection of Installation Location .............................................................18
4.2 Mounting the Inverter ................................................................................19
4.3 Electrical Connection ................................................................................21
4.4 Communication Connection .....................................................................34
4.5 Monitoring Device Installation ..................................................................38
5. Start and Stop ......................................................................................................39
5.1 Start Inverter ..............................................................................................39
5.2 Stop Inverter ..............................................................................................39
6. General Operation ..............................................................................................40
6.1 Display Operation .....................................................................................40
6.2 Auto-Test .................................................................................................... 41
6.3 Monitoring and Con󽗉guration..................................................................41
7.Troubleshooting ...................................................................................................42
7.1 Fault Messages ..........................................................................................42
7.2 Maintenance ..............................................................................................43
8. Technical Parameters .......................................................................................44

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1.Preface
1.1 Overview
This manual is an integral part of Sunways STH 4-12kW series three-phase high-voltage
hybrid inverters (hereinafter referred to as the hybrid inverters). It mainly introduces the
assembly, installation, electrical connection, debugging, maintenance and troubleshooting of
the products. Before installing and using hybrid inverters, please read this manual carefully,
understand the safety information and be familiar with the functions and characteristics of
hybrid inverters.
1.2 Target Groups
This manual is applicable to the electrical installers with professional qualifications and
the people who bought it. If there are any problems in the installation process, please call
Sunways service telephone at [phone] or email Sunways at service@sunways-tech.
com for consultation.
2.Safety Instructions
2.1 Safety Notes
2.1.1 Before installation, you should read this manual carefully and follow the instructions in
this manual strictly.
2.1.2 Installation operators need to undergo professional training or obtain electrical related
professional quali󽗉cation certi󽗉cates.
2.1.3 During the installation, do not touch any parts of the inner part of the inverter except the
terminals.
2.1.4 All electrical installations must conform to local electrical safety standards.
2.1.5 If the inverter needs maintenance, please contact the local designated personnel for
system installation and maintenance.
2.1.6 To use this grid-connected inverter for power generation needs the permission of the
local power supply authority.
2.1.7 During the operation of the inverter, the surface temperature may be higher and there is
a risk of burns. Do not touch.
2.1.8 When installing photovoltaic panels in the daytime, the photovoltaic panels should be
covered with opaque materials to avoid the risks and danger of high voltage at the panel end
in sunlight.
2.1.9 When wiring the lithium battery terminals, please disconnect the breaker or switch of the
lithium battery in case of a physical injury caused by the high-voltage.
Attention
The products, services or features you purchase are subject to the commercial
contracts and terms of Ningbo Sunways technologies Co., Ltd. All or part of the
products, services or features described in this document may not be within your
purchasing or using scope. 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.
Manufacturer: Ningbo Sunways technologies Co., Ltd.
Address: No. 1, Second Road, Green Industrial Zone, Chongshou Town,
Cixi City, ZheJiang Province, PEOPLE’S REPUBLIC OF CHINA
Website: www.sunways-tech.com
Service Mail: [e-mail]
Hotline: [phone]

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2.2 Statement
Ningbo Sunways technologies Co., Ltd. has the right not to undertake quality assurance in any
of the following circumstances:
2.2.1 Damages caused by irregular transportation.
2.2.2 Damages caused by incorrect storage, installation or use.
2.2.3 Damages caused by installation and use of equipment by non-professionals or untrained
personnel.
2.2.4 Damages caused by failure to comply with the instructions and safety warnings in the
products and documents.
2.2.5 Damages caused by running in an environment that doesn't meet the requirements
which stated in the documents.
2.2.6 Damages caused by operation beyond the parameters speci󽗉ed in applicable technical
speci󽗉cations.
2.2.7 Damages caused by unauthorized disassembly, alteration of products or modi󽗉cation of
software codes.
2.2.8 Damages caused by abnormal natural environment (force majeure, such as lightning,
earthquake, 󽗉re, storm, etc.).
2.2.9 Any damages caused by the installation or operation conditions beyond the stipulated
national standard corresponding to the country where the inverter installed.
2.2.10 Products beyond the warranty period.
2.3 Important Safety Matters
The following symbols may appear in this manual, which represent the following meanings:
2.4 Symbols Explanation
This chapter mainly elaborates the symbols displayed on the hybrid inverter, nameplate and
packing box.
2.4.1 Symbols on the Hybrid Inverter
DescriptionSymbol
Grid status indicator.
2.4.2 Symbol on the Inverter nameplate
The inverter cannot be disposed of with household waste.
DescriptionSymbol
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.
Danger. Risk of electric shock!
TUV certi󽗉cation.
Danger
Warning
Caution
Used to warn of urgent dangerous situations, if not avoided, it
could result in death or serious personal injury.
DescriptionSymbol
Used to warn of potentially dangerous situations, if not avoided, it
may result in death or serious personal injury.
Used to warn of potentially dangerous situations, if not avoided, it
may result in moderate or minor personal injury.
Attention
Used to transmit the safety warning information about equipment
or environment, if not avoided, it may cause equipment damage,
data loss, equipment performance degradation or other
unpredictable results. "Attention" does not involve personal
injury.
Note Used to highlight important information, best practices and
tips, etc. it's not warning, doesn't involve personal injury and
equipment damage information.
Power indicator.
Grounding symbol, the inverter casing needs to be properly
grounded.
Battery level indicator.
Inverter status indicator.

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Handle with care.
DescriptionSymbol
This side up.
Keep dry.
Stacked layers.
2.4.3 Symbol on the Packing box
3. Product Introduction
3.1 Basic Features
3.1.1 Function
Sunways STH series is also known as hybrid inverter or storage inverter, which is mainly used
to combine the PV array, lithium battery, loads and power grid to realize intelligent power
management and dispatching.
3.1.2 The STH 4~12kW series hybrid inverter contains 6 models which are listed below:
STH-4KTL-HT、STH-5KTL-HT、STH-6KTL-HT、STH-8KTL-HT、STH-10KTL-HT、
STH-12KTL-HT.
3.1.3 Applicable grid type
The applicable grid types of the Sunways STH 4~12kW series are TN-S, TN-C, TN-C-S and TT.
When applied to the TT grid, the voltage of N to PE should be less than 30V. See Figure 3-1 for
details:
Sunways
STH Series
TN-S
Transformer
Sunways
STH Series
TN-C
Transformer
Sunways
STH Series
TN-C-S
Transformer
Sunways
STH Series
TT
Transformer
Figure 3-1 Applicable grid type
DescriptionSymbol
The surface is hot during operation and no touch is allowed.
Electric shock hazard, it is strictly forbidden to use the person to
disassemble the inverter casing.

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3.1.4 Schematic Diagram of Hybrid System
The hybrid solar system is usually composed of the PV array, hybrid inverter, lithium battery,
loads and power grid. As shown in the Figure 3-2:
3.1.5 Operation Modes
Sunways STH Hybrid inverter has the following basic operation modes and you can con󽗉gure
the operation mode as per your preference in the App.
Mode 1
In this working mode, when
the power from the PV array is
sufficient, PV power will supply
the loads, battery, and grid by the
following sequence:
Loads＞ Battery＞ Grid.
PV power will supply the loads
first, and second charge the
battery, and then feed to the grid.
(You can set the power to the grid
to 0W if the local grid doesn’t
allow).
When the PV power is insu󽗋cient,
the battery will discharge to
supply loads, and the grid will join
in if the battery is not enough.
Mode 2
In this working mode, set the
Pmax from grid in the App can
realize the “Peak Load Shifting”.
When the loads consumption less
than the Pmax, loads are supplied
by the PV array and grid together.
When the loads consumption
more than the Pmax, the power
exceeded Pmax (cannot be higher
than the inverter max output
power) will be supplied by the
inverter. PV power will take the
priority to supply loads and if not
enough, the battery will continue.
Figure 3- 2 Schematic diagram of hybrid system
PV Array STH 4-12KTL-HT
CT
Meter
Three Phase Storage
Inverter
Back-up Loads
GridOn-grid Loads
High-voltage
Li-ion Battery
AC
RS485
DC
PV
PV
Inverter
Inverter
Load
Load
Grid
Grid
Battery
Battery
PV
Inverter
Load
GridBattery
Pload≥Pmax
* To realize the “Peak Load Shifting” function, the load power that exceeded Pmax has to be
within the inverter max output power, otherwise, the inverter will only output the max power
which allowed.
PV
Inverter
Load
GridBattery

12 13
Mode 5
In the purely o󽗈-grid mode, power
from PV will supply the back-up
loads first and then charge the
battery if there’re surplus.
Mode 3
In this working mode, the inverter
will use the power from PV or
grid (Set in the App) to charge the
battery until it is fully charged,
and as long as the grid is there,
the battery won’t discharge.
When the grid is cut off, power
from PV and battery will supply to
the loads connected in the back-
up side (UPS).
When the power from PV isn’t
enough, the battery will discharge
to supply back-up loads together
with PV.
Mode 4
In this working mode, you can set
charge/discharge power and time
in the App, inverter will use the
power from PV or grid(whether
to use can be set in the App)
to charge the battery in the
predetermined period.
Inverter will use power from PV
and battery to supply loads in the
predetermined period and the
insufficient part will be supplied
by the grid.
No Grid
No Grid
×
3.1.6 O󽗈-grid Output Ability (UPS Ability)
Sunways STH hybrid inverter supports max 2times off-grid instantaneous overload of rated
output power, and each phase support 1.25times continuous overload of rated output power
but only one of them can reach 1.25times output power at the same time.
3.1.7 Storage conditions
1) Inverter must be stored in its original packaging.
2) The storage temperature should be in the range of -30 ° C and + 60 ° C, and the relative
humidity stored is less than 90%.
3) If a batch of inverters needs to be stored, the height of each pile should be no more
than 6 levels.
PV
PV
PV
PV
PV
Inverter
Inverter
Inverter
Inverter
Inverter
Load
Load
Load
Load
Load
Grid
Grid
Grid
Battery
Battery
Battery
Battery
Battery

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3.2 Appearance Introduction
3.2.1 Inverter front view, as shown in Figure 3- 3:
Figure 3- 3 Front view
Figure 3- 4 Side view
3.2.2 Inverter side view, as shown in Figure 3-4:
410mm
175mm
Name
Plate
Logo
Display
550mm
410mm
Figure 3-5 Bottom view
Figure 3-6 Inverter back view
3.2.3 Inverter bottom view, as shown in Figure 3- 5:
3.2.4 Inverter back view, as shown in Figure 3- 6:
175mm
DC Switch
DC Input Terminal
Back Rail
Bettery Input Terminal Com Port
WIFI/LAN Port
Back-up Output Terminal
On-grid Output Terminal
Back Rail
Vent Valve

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Item Indicator Status Description
1
Battery
Level
Indicator
O󽗈 Battery not connected or communication fault.
Always on Battery is discharging or waiting, indicator shows battery
level.
Single indicator 󽗊ash Battery is charging, indicator shows battery level.
2Power
Indicator
O󽗈 Inverter no AC output.
Quick 󽗊ashing Inverter entered self-test status.
Always on Inverter works normal.
3Grid
Indicator
O󽗈 Disconnected with grid.
Slow 󽗊ashing Inverter detected grid but not running in on-grid mode.
Always on Inverter works in on-grid mode.
4Alarm
Indicator
O󽗈 The inverter is running normally.
Slow 󽗊ashing The monitoring device is not connected to the router or is
not connected to the base station.
Quick 󽗊ashing
The monitoring device is connected to the router or
connected to the base station but not connected to the
server.
Orange A waring is detected but inverter still working, view the
warning info on the display.
Red An alarm or fault is detected, view the fault info on the
display.
5Display
On Display the inverter operation information.
O󽗈 Display o󽗈 to save power, press the button to wake up the
display.
6Button Physical button Switch display information and set parameters by short
press or long press.
3.3 Display Interface
Figure 3-7 Display interface
Inspection Report
Quick Guide
Grid Licence
Inverter × 1 Wall Bracket × 1 Expansion Bolt × 5
PV Terminal × 2
Figure 3- 8 Packing list
3.4 Packing List
The package of the inverter includes the following accessories. Please check whether the
accessories in the packing box are complete at the 󽗉rst time when receiving the goods. See
Figure 3-8 for the packing list:
AC Cover × 1
Screw × 6
Back Up AC Terminal × 1
Cord End Terminal ×6
BAT Plug × 1
Monitoring Device × 1
(Optional)
PE Terminal × 2
On Grid AC Terminal × 1
Cord End Terminal ×6
Sunways Meter with 3 CTs × 1
Cord End Terminal × 8
User Manual × 1
Quick Guide × 1
Inspection Report × 1
Grid Connection Licence × 1
No. De󽗉nition
1 Battery Level Indicator
2 Power Indicator
3 Grid Indicator
4Alarm Indicator
5Display
6Button
2 4
1
5
3
6

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4.1.2 The requirements for inverter installation spacing are shown in Figure 4-2:
Figure 4-1 Recommended installation
Figure 4-2 Recommended installation space
500mm 500mm
500mm
500mm
300mm
300mm 300mm
Do not put 󽗊ammable and explosive articles around the inverter.
Warning
4. Product Installation
4.1 Selection of Installation Location
The Sunways STH 4~12kW series is designed with IP65 protection for indoor and outdoor
installations. When selecting an inverter installation location, the following factors should be
considered:
1) The wall on which the inverter is mounted must be strong and can withstand the weight of the
inverter for a long time.
2) The inverter needs to be installed in a well-ventilated environment.
3) Do not expose the inverter directly to strong sunlight to prevent the power derating due to
excessive temperature.
4) The inverter should be installed in a place with shelter to prevent direct exposure to sunlight
and rain.
5) Install the inverter at the eye level for easy inspection of screen data and further maintenance.
6) The ambient temperature of the inverter installation location should be between -30 ° C and
60 ° C.
7) The surface temperature of the inverter may reach up to 75 ° C. 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 Recommended installation location of the inverter, as shown in Figure 4-1:
Figure 4-3 Recommended installation angle
4.1.3 The installation angle of the inverter is recommended as shown in Figure 4-3:
FRONT
4.2 Mounting the Inverter
4.2.1 Wall bracket installation
Dimensions of wall bracket, see Figure 4-4:
Figure 4-4 Dimensions of wall bracket
150mm
300mm
150mm
150mm
150mm

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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 Mark the hole position
Figure 4-6 Fix the wall bracket
Figure 4-7 Mounting the inverter
2) Use an electrical driller with 10mm diameter bit to drill 5 holes on the wall and make sure
hole depth is 80mm.
3) 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 4-6:
4.2.2 Mounting the inverter
Lift up the inverter with both hands, hang the back rail on the 󽗉xed wall bracket carefully, see
Figure 4-7 for details:
Before drilling, make sure to avoid the buried water tube and electric wires
in the wall to avoid danger.
Warning
4.3 Electrical Connection
Danger hint
A high voltage in the conductive part of the inverter may cause an electric
shock. When performing any installation on the inverter, make sure that the AC
and DC sides of the inverter are completely de-energized.
Do not ground the positive or negative pole of the PV string, otherwise it will
cause serious damage to the inverter.
Static may cause damage to the electronic components of the inverter. Anti-
static measures should be taken during the repairing or installation.
Do not use other brands or other types of PV terminals other than the PV
terminal in the accessory package. Sunways has the right to refuse all damages
caused by the mixed-use of terminals.
Moisture and dust can damage the inverter, ensure the cable gland is securely
tightened during installation. The warranty claim will be invalided if the inverter
damaged by the cable connector not well installed.
Danger
Warning
Attention
Attention
Warning

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4.3.1 Sunways STH hybrid inverter electrical wiring diagram
This diagram shows Sunways STH 4~12kW series hybrid inverter wiring structure and
composition, concerning the real project, the installation and wiring have to be in line with the
local standards.
4.3.1.1 Single inverter wiring diagram
This diagram is an example without special requirement on electrical wiring connection.
Neutral line of AC supply can be isolated or switched.
Figure 4-8
Grid
PE
N
L3 L2 L1
CT C CT B CT A
PV Strings Battery
To Battery
To Sunways Meter
Power Meter
Sunways Meter
AC Breacker
AC Breacker
AC Breacker
AC Breacker
AC Breacker
1-phase
Loads 3-phase
Loads
Loads
FN Set
Run
Acrel
ACR10R
R_P
PV
Array
Grid
Normal
Loads
RCD RCD Back-up
Loads
PV
Array
Communication
Communication
BACK-UP
The additional
grounding hole
ON-GRID
PV1+
Breaker
E-BAR
N-BAR
Breaker
RJ45
1(L1)
5(L1-S1)
12(L)
9(L3-S1)
10(L3-S2)
2(L2)
6(L1-S2)
3(L3)
7(L2-S1)
4(N)
8(L2-S2)
13(N)
Breaker
Main Switch/Breaker
Sunways CT
CT-1
CT-2
CT-3
Switch/Breaker
L1 L1 L2 L2 L3 L3
N N
PV2+ PV1- PV2-
RJ45-BMS
RJ45-Meter
B+ B-
Battery
STH
Hybrid
Inverter
Sunways Meter
Figure 4-9 Standard wiring diagram

24 25
PV
Array
Grid
Normal
Loads
RCD RCD Back-up
Loads
PV
Array
Communication
Communication
BACK-UP
The additional
grounding hole
ON-GRID
PV1+
Breaker
E-BAR
N-BAR
Breaker
RJ45
1(L1)
5(L1-S1)
12(L)
9(L3-S1)
10(L3-S2)
2(L2)
6(L1-S2)
3(L3)
7(L2-S1)
4(N)
8(L2-S2)
13(N)
Breaker
Main Switch/Breaker
Sunways CT
CT-1
CT-2
CT-3
Switch/Breaker
L1 L1 L2 L2 L3 L3
N N
PV2+ PV1- PV2-
RJ45-BMS
RJ45-Meter
B+ B-
Battery
STH
Hybrid
Inverter
Sunways Meter
Figure 4-10 Australia wiring diagram
This diagram is an example for Australia and New Zealand. Neutral line of AC supply must not
be isolated or switched.
Do not connect the N-wire as a protective ground wire to the inverter casing.
Otherwise, it may cause electric shock.
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, just ground the PE cable.
For a multi-inverter system, all inverters PE wire need to be connected to the
same grounding copper bar to ensure equipotential bonding.
4.3.2 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 4-11:
Danger
Attention
Connect the inverter and ground bar through PE wire to achieve the purpose of grounding
protection. Please always remember wiring the PE wire before wiring other wires.
Figure 4-11 Grounding terminal connection
4.3.3 Inverter PV string connection
4.3.3.1 The following principles must be considered when making electrical connections to the
inverter:
1) Disconnect the AC breaker on the grid side.
2) The DC switch of the inverter must be turned to the "OFF" position.
3) The number and type of the PV panels connected in the two strings of one MPPT must be same.
4) Make sure the maximum output voltage of each PV string does not exceed 1000V.

26 27
4.3.3.2 DC connector assembly procedures
1) Select the appropriate photovoltaic cable:
2) Peel o󽗈 the DC cable insulation sleeve for 7 mm, as shown in Figure 4-12:
Cable type Conductor transverse area（mm²）
General photovoltaic cable
Scope(mm²) Recommended value（mm²）
2.5-4.0 4.0
Wire transverse area 2.5-4mm27mm
Figure 4-13
Figure 4-12
+
-
Crimping Plier
Figure 4-14
3) Disassemble the connector in the accessory bag, as shown in Figure 4-13:
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
it’s tight enough), as shown in Figure 4-14:
Figure 4-15
5) Insert the positive and negative cables into the corresponding positive and negative
connectors, pull back the 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 4-15:
Open-end Wrench
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.
Warning
7) Insert the positive and negative connectors into the inverter DC input terminals respectively,
and a "click" sound represents the assembly in place, as shown in Figure 4 -16:
Figure 4-16
4.3.4 Inverter battery connection
4.3.4.1 The following principles must be considered when making battery connection:
1) Disconnect the AC breaker on the grid side.
2) Disconnect the breaker on the battery side.

28 29
3)
Turn the inverter DC switch to the “OFF” position.
4) Make sure the maximum input voltage of battery is within the inverter limitation (180~750V).
4.3.4.2 Lithium battery connector assembly procedures
1) Select an appropriate DC cable.
2) Peel o󽗈 the DC cable insulation sleeve for 7 mm, as shown in Figure 4-17:
3) Use a flathead screwdriver to open the clamping bracket in the connector, as shown in
Figure 4-18:
4) Insert the stripped DC cable to the battery connector deep enough and toggle the clamping
bracket to make sure it tightly locked with the stripped cable, as shown in Figure 4-19:
Cable type Conductor transverse area (mm²)
AWG 10
Outside diameter (mm²) Conductor core section (mm²)
5.5-8.0 4.0-6.0
Wire transverse area 5.5-8.0mm215mm
Figure 4-17
Figure 4-18
Figure 4-19
4.3.5 AC output connector connection
4.3.5.1 The following principles must be considered when making AC output connection:
1) An independent AC breaker is required in both inverter on-grid and back-up output side,
and any loads cannot be connected with inverter directly.
2) Before making the connection of AC cable, please confirm all DC & AC power source are
disconnected from the inverter.
3) The Sunways STH 4~12kW series three-phase high voltage hybrid inverter applies to the
three-phase power grid with a voltage of 230/400V and a frequency of 50/60Hz.
5) Push the battery connector to the thread joint, and use an open wrench to lock the
connector in a torsion of 2Nm tightly, as shown in Figure 4-20:
6) Insert the positive and negative connector into the inverter battery terminals respectively,
and a “click” sound represents the assembly in place, as shown in Figure 4-21:
Figure 4-20
Figure 4-21
1.Before making the battery connector, please make sure the polarity of the
cable is correct.
2.Use a multimeter to measure the voltage of the battery pack and make sure
the voltage is within the inverter limitation and the polarity is correct.
Warning

30 31
Figure 4-22
Figure 4-23
Model STH-4KTL
-HT STH-5KTL -HT STH-6KTL -HT STH-8KTL -HT STH-10KTL -HT STH-12KTL -HT
Outside
diameter (mm) 12-18 12-18 12-18 12-18 12-18 12-18
Conductor core
section(mm²) 2.5-10 2.5-10 2.5-10 3.2-10 4-10 6-10
Breaker (A) 20 20 20 32 32 40
4.3.5.2 AC connector assembly procedures
The recommended AC cable and AC breaker for Sunways STH 4~12kW series three-phase
hybrid inverter are as shown in the following table:
1) According to the table above, select an appropriate AC cable, peel o󽗈 the insulation sleeve
of AC cable for 40~60mm, and peel o󽗈 the sleeve in the conductor core of 3L/PE/N wires for
8mm, as shown in Figure 4-22:
2) Insert the stripped AC cables through the AC connector cover in the sequence as shown in
Figure 4-23:
Strip Length:8mm
40-60mm
Wire Diameter:12-18mm
Cables Screw cap The insulator AC sheet
cover
BACK-UP
ON-GRID
Single hole
seal ring
Figure 4-25
Figure 4-26
Figure 4-24
3) Put the cord end terminals on the stripped conductors one by one and press with some
pressure to make it tightly locked with the conductors, as shown in Figure 4-24:
4) Lock the well-pressed cord end terminals into the AC connectorin the accessory bag and
make sure the cables sequence is in line with the mark on the connector, as shown in Figure
4-25:
5) Insert the assembled AC connector to the corresponding AC port in the inverter, as shown in
Figure 4-26:
The cold-pressed terminals must be locked tightly, and make sure it won’t
be loose after a long period of use.
Caution
Please distinguish the on-grid and back-up port, and don’t mix up the
on-grid port and back-up port when making the connection.
Caution
BACK-UP
ON-GRID

32 33
Figure 4-28
Figure 4-29 CT connection diagram
Figure 4-27
6) Lock the AC connector cover to the inverter with screws, as shown in Figure 4-27:
7) Screw up the rubber ring and anti-water cap to make sure the AC connector is well sealed,
as shown in Figure 4-28:
4.3.6 Meter and CT connection
1) The current transducer, also called CT, is usually installed on the fire wires between the
house loads and the power grid, as shown in Figure 4-29.
The Meter can install in the AC combiner box or other places that are unable to be touched by
children. Sunways CT integrated a cable with length of 2m and could be extended to 5m at
max.
Grid
Normal
Loads
RCD
RCD Back-up
Loads
Breaker
N-BAR
Breaker
RJ45
1(L1) 5(L1-S1) 12(L) 9(L3-S1) 10(L3-S2) 2(L2) 6(L1-S2) 3(L3) 7(L2-S1) 4(N) 8(L2-S2) 13(N)
Breaker
Main Switch/Breaker
Sunways CT
CT-1
CT-2
CT-3
S1-White Cable
S1-Black Cable
Switch/Breaker
Sunways Meter
House→ Grid
No. De󽗉nition Function
1 L1
L1/L2/L3/N connect to grid to detect
power grid voltage
2 L2
3 L3
4 N
5 L1-S1
Connect CT to detect current
6 L1-S2
7 L2-S1
8 L2-S2
9 L3-S1
10 L3-S2
12 L Power supplied from 220V grid
13 N
RS485 RS485 Communicate with inverter
CT installation direction and phase sequence should strictly follow the
instruction in the user manual, otherwise, the inverter may not be working
normally.
The CT has to be corresponding with the port in the meter, and the connection
between CT and Meter needs to be reliable, otherwise, the CT measurement
accuracy may be a󽗈ected.
The rated current of CT in the inverter accessory box is 80A, and the maximum
allowed inserted cable diameter is 16mm. If the max current through the CT
exceeds the rated current or the cable diameter wider than 16mm, please
contact Sunways for help.
Attention
Attention
Note
Figure 4-30 Meter wiring diagram
Figure 4-31 Meter terminals de󽗉nition
2) The three CTs have already well-connected on the Sunways Meter while you received, and
you just need to follow the wiring diagram in the Meter to connect CT, as shown in Figure 4-30.
Meter terminals de󽗉nition as shown in table 4-31:
Please refer to chapter 4.4.2 for the communication between Meter and inverter.
CT A
CT B
CT C
To Sunways Meter
Power Meter
Sunways Meter
AC Breacker
AC Breacker
FN Set
Run
Acrel
ACR10R
R_P
1
2
567921 22
23
10
8
3
4
13
RS485
12

34 35
4.4 Communication Connection
4.4.1 Communication wiring illustration
All communication ports are hidden behind the communication terminal in the bottom of
inverter which are include Meter port, CAN port, BMS port, EMS port, relay output port, DRED
port, as shown in Figure 4-32、4-33.
Cables Screw
1
3
5
2
4
6
Screw cap The insulator
Single hole seal ring Com sheet cover
Figure 4-33
Figure 4-32
Inverter communication interface and de󽗉nition as shown in table 4-34:
Figure 4-34 Meter terminals de󽗉nition
Type De󽗉nition
METER Communicate with Meter
BMS Communicate with BMS
DRED For Australia use/One key to shut o󽗈
PARCAN Parallel CAN communication bus interface
EMS EMS power dispatching interface
RLYOUT Dry contact output, a group of normally open
contact passive dry contact
PARCAN
EMS
RLYOUT
4.4.2 Communication between inverter and meter
The communication between meter and inverter is an RJ45 interface cable.A 10M length meter
communication cable is already attached to the inverter when you received it and this cable
could be extended up to 100M. Insert the RJ45 heads into the meter RS485 port which as
shown in Figure 4-36.
Figure 4-36
Dismantle the cover of the communication ports with a screwdriver, and put all
communication cables through the holes and follow the illustration below to make the
connection of each communication cables, and when all cables have connected, put back the
cover and screw up the anti-water cap of the holes, as shown in Figure 4-35:
Figure 4-35
RS485
METER

36 37
No. Color Meter Side Battery Side
1 Orange&White / RS485_A
2 Orange / RS485_B
3 Green&White RS485_B /
4 Blue / CAN_H
5 Blue&White / CAN_L
6 Green RS485_A /
7 Brown&White RS485_B /
8 Brown RS485_A /
Figure 4-37 RJ45 terminal connection sequence and de󽗉nition
RJ45 terminal connection sequence and de󽗉nition as shown in table 4-37.
4.4.3 Communication between inverter and battery
The communication between meter and inverter is an RJ45 interface cable. A 3M length
battery communication cable is already attached to the inverter when you received it, and you
just need to insert it to the BMS interface of the inverter and battery.
4.4.4 Multiple inverters parallel connection/EMS/Relay output dry contact
Multiple inverters parallel connection, EMS and relay output dry contact interfaces use the
6pin terminal on the right side, and you can use the matching 6pin terminal in the accessory
box to make the connection, as shown in Figure 4-38.
Terminal de󽗉nition：
No. 123456
De󽗉nition CAN PAR EMS RLY OUT
CAN_H CAN_L RS485_B RS485_A RLY_COM RLY_NO
1
3
52
4
6
8
Figure 4-38 Parallel connection/EMS/relay output dry contact terminal
7
Before purchasing the battery, you have to make sure the battery you
selected is in the battery approval list of Sunways, otherwise, the system
may not work properly. Please contact your installer or Sunways service
team for con󽗉rmation if you’re not sure about it.
Note
1
3
5
2
4
6
EMS
Inverter
RS485_B
RS485_B
RS485_A
RS485_A
1) The EMS communication between inverter and battery should be connected through the
RJ45 cable that is attached to the inverter when you need to control the work of the hybrid
inverter.
Figure 4-39 EMS communication wiring diagram
2) Sunways STH 4~12kW series hybrid inverter integrated a set of relay output dry contacts
with the contact capacity 230Vac/1A or 30Vdc/1A that are very useful in some special
circumstances, such as in the purely off-grid system, it can be used to trigger the backup
generator. Please contact your installer or Sunways service team to learn more detailed
operation steps.
4.4.5 DRED Connection
DRED interface is special reserved for Australia and New Zealand according to their safety
regulation, and Sunways doesn’t provide the DRED device for the customer.
DRED connection uses the 6pin terminal on the left side, and you can use the matching 6pin
terminal in the accessory box to make the connection, as shown in Figure 4-40.
DRED terminal de󽗉nition：
No. 123456
De󽗉nition COM/DRMO REFGEN DRM4/8 DRM3/7 DRM2/6 DRM1/5
Figure 4-40 DRED terminal
1
3
5
2
4
6

38 39
Figure 4-41 One key to shut o󽗈 terminal
Figure 4-42 Monitoring device installation
4.4.6 One key to shut o󽗈
Sunways STH 4~12kW hybrid inverter comes with one key to shut o󽗈 function, and you can
use this function by connecting an external switch into the DRED interface if it requires in the
installation place. The external switch doesn't include in our accessory box. Please refer to
Figure 4-41 for the external switch connection.
Terminal de󽗉nition：
No. 123456
De󽗉nition COM/DRMO REFGEN / / / /
1
3
5
2
4
6
Switch
4.5 Monitoring Device Installation
Sunways STH 4~12kW series hybrid inverter can be monitored through either WiFi or LAN, and
you can alternatively select according to your preference.
Plug the WiFi or LAN module into the WiFi/GPRS port in the bottom of inverter by following the
direction the side with indicator is up (as shown in Figure 4-42). A slight “click” sound during
the installation represents that the assembly is in place.
5. Start and Stop
5.1 Start Inverter
When starting the inverter, follow these steps:
1) Turn the DC switch in the inverter bottom to the “ON” position.
2) Turn on the lithium battery switch.
3) Switch on the AC breaker 󽗉rst.
4) The inverter will start to check the DC and AC input parameters and self-check, and if
everything is normal, the inverter will start to work according to the work mode which you set
on the App. The inverter display and indicators will show relative parameters and status.
5.2 Stop Inverter
When turning o󽗈 the inverter, please follow the steps below:
1) Shut o󽗈 the inverter through the APP or the button on the display 󽗉rst.
2) Disconnect the breakers on the grid and load side.
3) Turn o󽗈 the battery switch, and disconnect the DC breaker on the battery side (if any).
4) Wait 30 seconds and then turn the inverter 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 operating.
5) Disconnect the AC and DC cables.