Stealth ST-INV-S Series User manual

User Manual
ST-INV-S Series
PV Energy Storage Grid-
connected Inverter
www.stealthenergy.cn VER: 1.2

User Manual
I
About this manual
This manual mainly introduces the product information, installation, operation and maintenance
guidelines of the inverter, and does not include all the information of the photovoltaic system.
You can log on to www.stealthenergy.cn or the website of the equipment manufacturer for more
information.
Scope of application
This manual is applicable to the following models of low-power string photovoltaic grid-
connected inverters:
•
ST-INV-S3.0
•
ST-INV-S3.68
•
ST-INV-S4.0
•
ST-INV-S5.0
Unless otherwise specified, hereinafter referred to as "inverter".
To the reader
This manual is intended for professional technicians who install, operate and maintain the
inverter, as well as end users who need to view inverter information.
Manual use
Please read the manual carefully before using the product, and keep the manual in a place where
it is easily accessible.
The contents of the manual and the pictures, logos, symbols, etc. used are owned by Suzhou
Stealth Energy Technology Co., Ltd. Persons who are not staff of the company are not allowed
to publicly reproduce all or part of the content without written authorization.
The content of the manual will be continuously updated and revised, and users can obtain the
latest version of the manual via www.stealthenergy.cn or through their sales channels.

User Manual
II
Change history
Below are the historical changes from previous versions of the manual. The latest
document contains all changes made in previous versions.
V1.2 (2023-02-20)
●Update 9.2 technical data.
PV input: maximum input current (Ad.c.) and maximum short-circuit current (Ad.c.)
V1.1 (2021-10-20)
This version is the first formal version.

User Manual
III
Symbol use
In order to ensure the personal and property safety of users when using the product, and to use
the product more efficiently and optimally, the manual provides relevant safety information,
which is highlighted by the following symbols.
Please take careful note of the meaning of the warning symbols so that you can minimize all
risks.
Symbol Description
High potential risk which, if not avoided, will result in death or
serious injury.
Moderate potential risk which, if not avoided, could result in death
or serious injury.
Low potential risk which, if not avoided, could result in moderate or
minor injury.
Potential risk which, if not avoided, could result in failure of the
equipment in normal operation or property damage.
It emphasizes and complements content, or provides tips on using
the product that can help you solve a problem or save time.
CAUTION
NOTICE

User Manual
IV
Table of contents
1Safety instruction 1
1.1 General safety instruction 1
1.2 Inverter 2
1.3 Skill requirements for professional technicians 3
2Product description 4
2.1 PV energy storage grid-connected system 4
2.2 Product introduction 5
2.2.1 Model description 5
2.2.2 Product appearance 5
2.2.3 Dimension and weight 6
2.2.4 LED indicator 6
2.3 Function description 7
2.4 Working mode 8
3Unpacking and storage 11
3.1 Unpacking inspection 11
3.2 Identifying inverter 11
3.3 Shipping list 12
3.4 Inverter storage 12
4Mechanical installation 13
4.1 Installation precautions 13
4.2 Choose the installation site 13
4.3 Installation tools and parts 16
4.4 Installation of inverter 17
5Electrical connection 19
5.1 Terminal introduction 20
5.2 Overview of electrical connection 21
5.3 Ground connection 22
5.4 Grid and Back-up connection 23
5.4.1 AC side requirements 23
5.4.2 Assembling the cable to the AC & Back-up connector 24
5.4.3 Installation of AC connector 25

User Manual
V
5.5 PV string connection 27
5.5.1 PV input device 27
5.5.2 Assembling the cable to the PV connector 29
5.5.3 Installing the PV connector 30
5.6 Battery cable connection 31
5.6.1 Requirements on the battery side 31
5.6.2 Assembling the cable to the Bat connector 32
5.6.3 Installing the Bat connector 33
5.7 WIFI communication connection 34
5.8 Meter connection 34
5.9 DRED connection 36
5.10 BMS connection 37
6Test run 38
6.1 Inspection before test run 38
6.2 Test run steps 38
7Decommissioning, removing and discarding 39
7.1 Decommissioning inverter 39
7.2 Removing inverter 40
7.3 Discarding inverter 40
8Troubleshooting and maintenance 41
8.1 Troubleshooting 41
8.1.1 Troubleshooting displayed in APP 41
8.2 Daily maintenance 44
9 Appendix 45
9.1 Confirmation before contact 45
9.2 Technical data 45
9.3 Quality assurance 48

User Manual
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1Safety instruction
The inverter is strictly designed and tested in accordance with relevant international safety
standards. As a piece of electrical and electronic equipment, it is necessary to comply with
relevant safety specifications during installation, testing, operation and maintenance.
Unreasonable use or maloperation may result in:
•
Danger to life and personal safety of the operator or third party
•
Damage to the inverter or other property belonging to the operator/third party
In order to avoid casualties, damage to the inverter or other equipment, please strictly adhere to
the following safety precautions. The specific precautions during the operation will be
explained in the corresponding chapters.
1.1 General safety instruction
PV panel
Please follow the various instructions for PV panels.
DANGER
Fatal voltage danger!
Exposure of PV strings to sunlight will generate dangerous voltages.
Since the energy storage battery system may cause the danger of electric shock and short
circuit, in order to avoid possible accidents
, all electrical connections must be completed
only
by professional technicians.
Utility grid
Please follow the connection rules of local grid.
所有
电气连接必须满足当地以及国家电气标准。
仅
在得到当地电力部门许可后，才可将逆变器并入电网。
NOTICE
All electrical connections must meet local and national electrical codes.
The inverter can only be connected to the grid with permission from the local
electric
power
department.

User Manual
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5min
1.2 Inverter
The warning signs and descriptions on the inverter are shown in the table below:
CE certified.
TUV certified.
RCM certified
Watch out! Potential danger, please do not operate powered on!
After the inverter is disconnected from all external power sources, wait
at least 5 minutes before touching live devices.
The surface is hot, be careful of burns! To avoid burns, do not touch the
surface of the machine while it is running.
Danger of high voltage!
Installation and operation can
only be performed by qualified
professionals.
Please read the manual before performing any operation on the inverter.
The inverter cannot be disposed of together with the household waste.
Disposal information can be found in the enclosed documentation.