Sunways STH-4KTL-HT User manual

SUNWAYS TECHNOLOGIES CO., LTD.
Hybrid Inverter
STH 4~12KTL-HT
User Manual
EN

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 Introduction …………………………………… 11
3.1 Basic Features ……………………………………………………… 11
3.2 Appearance Introduction ………………………………………… 16
3.3 Display Interface …………………………………………………… 18
3.4 Packing List ………………………………………………………… 19
4 Product Installation ……………………………………… 22
4.1 Selection of Installation Location ………………………………… 22
4.2 Mounting the Inverter(standard bracket) ………………………… 24
4.3 Mounting the Inverter (Including bracket options) ……………… 26
4.4 Electrical Connection ……………………………………………… 29
4.5 Communication Connection ……………………………………… 48
4.6 Monitoring Device Installation …………………………………… 54
5 Start and Stop ……………………………………………… 55
5.1 Start Inverter ………………………………………………………… 55
5.2 Stop Inverter ………………………………………………………… 55
6 General Operation ………………………………………… 56
6.1 Display Operation …………………………………………………… 56
6.2 Auto-Test ……………………………………………………………… 60
6.3 Monitoring and Con󽗉guration …………………………………… 61
7 Troubleshooting …………………………………………… 62
7.1 Fault Messages ……………………………………………………… 62
7.2 Maintenance ………………………………………………………… 67
8 Technical Parameters …………………………………… 68
CONTENTS

4 5
Attention
The products, services or features you purchase are subject to the commercial con-
tracts 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.
1 Preface
1 PrefaceAttention
※ 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 troubleshoot-
ing 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 charac-
teristics of hybrid inverters.
※ 1.2 Target Groups
This manual is applicable to the electrical installers with professional quali󽗉cations 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@sun-
ways-tech.com for consultation.

6 7
2 Safety Instructions
2 Safety Instructions2 Safety Instructions
※ 2.1 Safety Notes
① Before installation, you should read this manual carefully and follow the instructions in
this manual strictly.
② Installation operators need to undergo professional training or obtain electrical related
professional quali󽗉cation certi󽗉cates.
③ During the installation, do not touch any parts of the inner part of the inverter except
the terminals.
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 During the operation of the inverter, the surface temperature may be higher and there is
a risk of burns. Do not touch.
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.
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.
※ 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 irregular transportation.
② Damages caused by incorrect storage, installation or use.
③ Damages caused by installation and use of equipment by non-professionals or un-
trained personnel.
④ Damages caused by failure to comply with the instructions and safety warnings in the
products and documents.
⑤ Damages caused by running in an environment that doesn't meet the requirements
which stated in the documents.
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 installation or operation conditions beyond the stipulated
national standard corresponding to the country where the inverter installed.
⑩ Products beyond the warranty period.
※ 2.3 Important Safety Matters
The following symbols may appear in this manual, which represent the following mean-
ings:
Danger
Used to warn of urgent dangerous situations, if not avoided, it could result in death or
serious personal injury.
Warning
Used to warn of potentially dangerous situations, if not avoided, it may result in death or
serious personal injury.
Caution
Used to warn of potentially dangerous situations, if not avoided, it may result in moder-
ate or minor personal injury.

8 9
※ 2.4 Symbols Explanation
This chapter mainly elaborates the symbols displayed on the hybrid inverter, nameplate
and packing box.
Attention
Used to transmit the safety warning information about equipment or environment, if not
avoided, it may cause equipment damage, data loss, equipment performance degrada-
tion 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.
2.4.1 Symbol on the Hybrid Inverter
Power indicator.
Grid status indicator.
Inverter status indicator.
Battery level indicator.
2.4.2 Symbol on the Inverter nameplate
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!
Grounding symbol, the inverter casing needs to be properly grounded.
2 Safety Instructions2 Safety Instructions

10 11
Figure 3-1 Applicable grid types
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 invert-
er casing.
2.4.3 Symbol on the Packing box
Handle with care.
This side up.
Keep dry.
Stacked layers.
3 Product Introduction
3 Product Introduction
3.1.2 Models
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:
TN-S
Sunways
STH Series
Transformer
TN-C
Sunways
STH Series
Transformer
TN-C-S
Sunways
STH Series
Transformer
TT
Sunways
STH Series
Transformer
2 Safety Instructions
※ 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
.

12 13
Figure 3- 2 Schematic diagram of hybrid system
3 Product Introduction
PV Array STH 4-12KTL-HT
CT
Meter
Three Phase Storage
Inverter
Back-up Loads
GridOn-grid Loads
High-voltage
Lithium Battery
AC
RS485
DC
3.1.4 Schematic Diagram of Hybrid System
The hybrid solar system is usually composed of the PV array, hybrid inverter, lithium bat-
tery, 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󽗉g-
ure the operation mode as per your preference in the App.
3 Product Introduction
PV
Inverter
Loads
GridBattery
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 to sup-
ply loads.
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. Inverter will
use power from PV array to supply loads
󽗉rst and battery second if it isn't enough.
PV
Inverter
Loads
GridBattery
Mode 1
Mode 2
Screen Setting step:
① General Settings → WorkMode Set → Gen-
eral Mode
② Advanced Settings → Peakload Shifting →
ON
③ Advanced Settings → SetMaxGrid → XXX
(kVA)
APP Setting step:
General Mode → To Set → Peakload Shifting
ON → Set Max Grid (kVA)
PV
Inverter
Loads
GridBattery
In this working mode, set the Pmax from grid in the App can realize the “Peakload Shifting”.
PV
Inverter
Loads
GridBattery Pload≥ Pmax

14 15
* To realize the “Peakload 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.
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 o󽗈, power from PV and
battery will supply loads connected in the
back-up side (UPS).
Mode 3
×
PV
Inverter
Loads
GridBattery
In this working mode, you can set charge/
discharge power and time in the App, invert-
er will use the power from PV or grid(wheth-
er to use can be set in the App) to charge the
battery in the predetermined period.
Mode 4
PV
Inverter
Loads
GridBattery
In the purely o󽗈-grid mode, power from PV
will supply the back-up loads 󽗉rst and then
charge the battery if there's surplus.
Mode 5
Inverter will use power from PV and battery
to supply loads in the predetermined period
and the insu󽗋cient part will be supplied by
the grid.
PV
Inverter
Loads
GridBattery
O󽗈-grid Overloading Ability Illustration
Status Mode Phase 1 Phase 2 Phase 3 Duration
O󽗈-grid
Balance Output Mode
1.1 times 1.1 times 1.1 times Continuous
2 times 2 times 2 times 60s
Unbalance Output Mode 1.25 times** 1.25 times** 1.25 times** Continuous
* The multiples above are calculated based on rated output power.
* STH-12KTL-HT instantaneous max output power is 20kW.
**
Only one of the three phases can reach up to 1.25 times, and the other two phases should be less than 1.1 times.
When the power from PV isn’t enough,
the battery will discharge to supply back-up
loads together with PV.
No Grid
PV
Inverter
Loads
Battery
No Grid
PV
Inverter
Loads
Battery
3.1.6 O󽗈-grid Output Ability (UPS Ability)
Sunways STH hybrid inverter overloading ability in o󽗈-grid work mode describes as following:
3 Product Introduction 3 Product Introduction

16 17
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 should be 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.
※ 3.2 Appearance Introduction
Logo
Display
550mm
410mm
Figure 3- 3 Front view
3.2.1 Inverter front view
410mm
175mm
Name
Plate
3.2.2 Inverter side view
Figure 3- 4 Side view
Figure 3-5 Bottom view
3.2.3 Inverter bottom view
Figure 3-6 Inverter back view
175mm
DC Switch (Optional)
DC Input Terminal
Back Rail
Battery Input Terminal Com2 Port
Com1 Port
Back-up Output Terminal
On-grid Output Terminal
3.2.4 Inverter back view
Back Rail
Vent Valve
3 Product Introduction 3 Product Introduction

18 19
No. De󽗉nition
1 Battery Level Indicator
2 Power Indicator
3 Grid Indicator
4 Alarm Indicator
5 Display
6 Button
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.
Slow 󽗊ashing Inverter entered waiting 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.
※ 3.3 Display Interface
Figure 3-7 Display interface
2 4
1
5
3
6
Item Indicator Status Description
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 con-
nected to the base station but not connected to the server.
Orange A Warning is detected but inverter still working, view the
fault info on the display.
Red An alarm or fault is detected, view the fault info on the dis-
play.
5 Display
On Display the inverter operation information.
O󽗈 Display o󽗈 to save power, press the button to wake up the
display.
6 Button Physical button Switch display information and set parameters by short
press or long press.
※ 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:
Inverter×1 Wall Bracket×1
3 Product Introduction 3 Product Introduction

20 21
According to the di󽗈erent shipping time, we have two di󽗈erent types of meters.
Figure 3- 8 Packing list
Back Up AC Terminal×1
Cord End Terminal×6
Monitoring Device × 1(Optional)
PV Terminal× 2Expansion Bolt× 5
On Grid AC Terminal×1
Cord End Terminal×6
Inspection
Report
User
Manual
Quick
Guide
Monitoring Device (Optional)
Back-Up Terminal
User Guide
On-Grid Terminal
Expansion Bolt PV Terminal
AC Cover
Sunways Meter B with 3 CTs ×1
Cord End Terminal × 8
AC Cover× 1 , Screw× 6
Battery Plug× 1PE Terminal× 1
PE Teminal Battery Plug
3 Product Introduction 3 Product Introduction
Sunways Meter B
L-shaped Plate x1,Screw x3
L-shaped Plate(Optional)
Sunways Meter A with 3 CTs ×1
Cord End Terminal × 8
Sunways Meter A

22 23
4 Product Installation
Figure 4-1 Recommended installation
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 main-
tenance.
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 reach-
ing of children.
4.1.1 Recommended installation location of the inverter, as shown in Figure 4-1:
4 Product Installation
Warning
Do not put 󽗊ammable and explosive articles around the inverter.
4.1.2 The requirements for inverter installation spacing are shown in Figure 4-2:
Figure 4-2 Recommended installation space
500mm 500mm
500mm
500mm
300mm
300mm 300mm
Figure 4-3 Recommended installation angle
4.1.3 The installation angle of the inverter is recommended as shown in Figure 4-3:

24 25
※ 4.2 Mounting the Inverter (standard bracket)
Figure 4-4 Dimensions of wall bracket
4.2.1 Wall bracket installation
Dimensions of wall bracket, see Figure 4-4:
150mm
300mm
150mm
150mm
150mm
① Use the wall bracket as the template to mark the position of 5 holes on the wall. See Fig-
ure 4-5 for details:
Figure 4-5 Mark the hole position
Figure 4-6 Fix the wall bracket
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:
Figure 4-7 Mounting the inverter
Warning
Before drilling, make sure to avoid the buried water tube and electric wires in the wall to
avoid danger.
Lift up the inverter with both hands, hang the back rail on the 󽗉xed wall bracket carefully,
see Figure 4-7 for details:
4.2.2 Mounting the inverter
4 Product Installation4 Product Installation

26 27
※ 4.3 Mounting the Inverter （Including L-shaped Plate）
4.3.1 Wall bracket installation
Dimensions of wall bracket, see Figure 4-8:
Figure 4-8 Dimensions of wall bracket
① Use the wall bracket as the template to mark the position of 5 holes on the wall. See Fig-
ure 4-9 for details:
Figure 4-9 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 4-10 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 4-11:
Figure 4-11 Fixing the wall bracket
150mm
300mm
150mm
150mm150mm
4 Product Installation4 Product Installation

28 29
※ 4.4 Electrical Connection
Danger
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.
Warning
Do not ground the positive or negative pole of the PV string, otherwise it will cause seri-
ous damage to the inverter.
Warning
Static may cause damage to the electronic components of the inverter. Anti-static mea-
sures should be taken during the repairing or installation.
Attention
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.
Attention
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.
This diagram shows Sunways STH 4~12kW series hybrid inverter wiring structure and com-
position, concerning the real project, the installation and wiring have to be in line with the
local standards.
4.4.1 Sunways STH hybrid inverter electrical wiring diagram
4 Product Installation
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 4-12 for details:
4.3.2 Mounting the inverter
Figure 4-12 Mounting the inverter
4 Product Installation

30 31
Figure 4-13
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 Breaker
AC Breaker
AC Breaker
AC Breaker
AC Breaker
1-phase
Loads 3-phase
Loads
Loads
FN Set
Run
Acrel
ACR10R
R_P
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.
If you get Sunways meter A, please refer to Figure 4-14A：
Figure 4-14A Standard wiring diagram
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
RS485-2
1(L1)
5(L1-S1)
9(L3-S1)
10(L3-S2)
2(L2)
6(L1-S2)
3(L3)
7(L2-S1)
4(N)
8(L2-S2)
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 A
4 Product Installation4 Product Installation

32 33
Figure 4-15A Australia wiring diagram
This diagram is an example for Australia and New Zealand. Neutral line of AC supply must
not be isolated or switched.
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
RS485-2
1(L1)
5(L1-S1)
9(L3-S1)
10(L3-S2)
2(L2)
6(L1-S2)
3(L3)
7(L2-S1)
4(N)
8(L2-S2)
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 A
4 Product Installation
If you get Sunways meter B, please refer to Figure 4-14B：
Figure 4-14B Standard wiring diagram
Sunways Meter B

34 35
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 perfor-
mance. 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.
Figure 4-16 Grounding terminal 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 4-16 :
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.
4.4.2 External ground connection
4 Product Installation
Figure 4-15B Australia wiring diagram
For Sunways meter B, please refer to Figure 4-15B:

36 37
1. The following principles must be considered when making electrical connections to the in-
verter:
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.
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 4-17:
4.4.3 Inverter PV string connection
Figure 4-17
Wire cross-sectional area 2.5-4mm27mm
Cable type Conductor cross-sectional area (mm²)
General photovoltaic cable
Scope (mm²) Recommended value (mm²)
2.5-4.0 4.0
4 Product Installation
③ Disassemble the connector in the accessory bag, as shown in Figure 4-18:
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 4-19:
+
-
Crimping Plier
Figure 4-18
Figure 4-19
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 con-
nector.
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 4-20:
4 Product Installation

38 39
Figure 4-20
Open-end Wrench
Figure 4-21
⑦ Insert the positive and negative connectors into the inverter DC input terminals respec-
tively, and a "click" sound represents the assembly in place, as shown in Figure 4 -21:
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 Product Installation
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.
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).
2. Lithium battery connector assembly procedures
① Select an appropriate DC cable.
4.4.4 Inverter battery connection
② Peel o󽗈 the DC cable insulation sleeve for 7 mm, as shown in Figure 4-22:
③ Use a 󽗊athead screwdriver to open the clamping bracket in the connector, as shown in
Figure 4-23:
Cable type Conductor cross-sectional area (mm²)
AWG 10
Outside diameter (mm²) Conductor core section (mm²)
5.5-8.0 4.0-6.0
Wire cross-sectional area 5.5-8.0mm215mm
Figure 4-22
4 Product Installation