Stealth ST-INV-S3.0 User manual

USER MANUAL
ST-INV-S3.0
ST-INV-S3.68
ST-INV-S4.0
ST-INV-S5.0
PV grid-connected energy
storage inverter
VER:1.2
www.stealthenergy.cn

User Manual
I
About this manual
This manual mainly introduces the product information, Installation, operation
and maintenance guidelines of the photovoltaic energy storage and grid-
connected integrated machine. It does not contain all the information of the
photovoltaic system. You can log on to www.stealthenergy.cn or the equipment
manufacturer's website for more information.
Scope of application
This manual is applicable to the following models of low-power string-type
photovoltaic energy storage grid-connected machines:
• ST-INV-S3.0
• ST-INV-S3.68
• ST-INV-S4.0
• ST-INV-S5.0
Unless otherwise speci󶀄ed, hereinafter referred to as inverter.
To the reader
This manual is inte nded 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 inside 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, the user
please refer to the actual product purchased, and can pass the www.stealthenergy.
cn or sales channels to obtain the latest version of the manual.

User Manual
II
Change History
Changes between document issues are cumulative. The latest document
issuecontains all the changes made in earlier issues.
V1.2 (2023-02-20)
● Updated 9.2 Technical data .
PV Input :Max.input current(Ad.c.) and Max.short circuit current(Ad.c.)
V1.1 (2021-10-20)
This Version is the 󶎁rst o󶎃cial release.

User Manual
III
Symbol usage
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 carefully understand the meaning of the warning symbols so that you can
use the manual better.
Symbol Description


A highly potentially hazardous situation which, if not
avoided, will result in death or serious injury.
Moderately hazardous, which, if not avoided, could result in
death or serious injury.
！CAUTION
Low potential hazard situation which, if not avoided,could
result in moderate or minor injury to persons
There is a low potential hazard, and if not avoided, may
cause the equipment to fail to operate normally or cause
property damage.
Emphasizes and complements content, or provides tips
using the product that can help you solve a problem or
save time.
DANGER
WARNING
NOTICE

User Manual
IV
About this manual
1Safetyinstruction 1
1.1Generalsalfetyinstruction 1
1.2inverter 2
1.3Skillsrequirementsforprofessionalandtechnicalpersonnel 3
2Productdescription4
2.1Grid-connectedPVenergystoragesystem 4
2.2Poductintroduction 5
2.2.1Modeldescription 5
2.2.2Apperance 5
2.2.3Dimensionsandweight 6
2.2.4LEDindicatorlight 6
2.3Functiondescription 7
2.4Workingmode 8
3Unpackingandstorage11
3.1Unpackinginspection 11
3.2Identicationofinverter 11
3.3Deliverylist 12
3.4Storageofinverter 12
4MechanicalInstallation13
4.1InstalltionPrecautions 13
4.2ChoosetheInstallationsite 13
4.3Installationtoolsandparts 16
4.4Installationofinverter 17
5Electrical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InstallingtheACConnector 25
5.5PVseriesconnection 27
5.5.1PVInputConguration 27

User Manual
V
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Type-Ccommunicationconnection 34
5.8MeterConnection 34
5.9DREDConnection 36
5.10BMSConnection 37
6Testoperation38
6.1Inspectionbaforetestrun 38
6.2Testrunsteps 38
7Decommissioning,dismantling,anddiscardingInverter39
7.1Decommissioning 39
7.2Dismantling 40
7.3Discarding 40
8Troubleshootingandmaintanance41
8.1Troubleshooting 41
8.1.1TroubleshootinginAPPdisplay 41
8.2Dailymaintanance 44
9Appendix45
9.1Contact 45
9.2Technicaldata 45
9.3QualityAssurance 48

User Manual
1
1 Safety instruction
Inverter machine is designed and tested in strict accordance with relevant
international safety standards. As electrical and electronic equipment, relevant
safety regulations must be observed during its Installation, commissioning,
operation and maintenance. Unreasonable use or misuse may result in:
• Harm the life and personal safety of the operator or a third party
• Damage the inverter or other property belonging to the operator/third party
In order to avoid personal injury, damage to the inverter or other equipment,
please strictly follow the following safety precautions. The specific precautions
during the operation will be explained in the corresponding chapters.
1.1 General salfety instruction
PV panels
Please follow the various instructions for photovoltaic panels.
Utility grid
Please follow the access of local grid.
All electrical connections must meet local and national electrical codes.
The inverter can only be connected to the grid with permission from the local
power department.
Fatal voltage dangerFatal voltage danger
Exposure of PV strings to sunlight will generate dangerous voltages.Exposure of PV strings to sunlight will generate dangerous voltages.
Since the energy storage battery system may cause the danger of electric shock 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 and short circuit, in order to avoid possible accidents. All electrical connections
are required and should only be done by professional technicians.are required and should only be done by professional technicians.
DANGER
NOTICE

User Manual
2
1.2 inverter
The warning signs and descriptions on Inverter are shown in the table below:
Pay attention to danger, do not operate with electricity!
After the inverter unit 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.
High voltage danger!
Installation and operation should only be performed by
quali󶎁ed professionals.
Please read the manual before performing any operation on the
interver.
5min
The inverter can not be disposed together with the household
waste. Disposal information can be found in the enclosed
documentation.
CE mark.
The inverter complies with the requirements of the
applicable CE guidelines.
RCM remark.
TUV certi󶎁ed.

User Manual
3
Danger of electric shock!
Only the intact and closed box shell can protect the safety of people and
property. Do not open the cover of the inverter when the inverter is working or
powered on, otherwise Stealth Energy will not be held responsible.
Danger of damage to the inverter unit or personal injury!
When Inverter is working, it is forbidden to plug or unplug the PV connector, AC
connector and Bat connector.
All safety signs, warning labels and nameplates on the Inverter must be clearly
visible and cannot be removed or covered.
DANGER
WARNING
Danger of burns!
When the inverter is running, only touch the LED indicator and the DC switch. It
is strictly forbidden to touch the hot parts of the device (such as radiator, etc.)
during operation.
Country selection and protection parameters must be set by professional
technicians according to local power grid standards. The wrong country setting
may affect the normal operation of the inverter, causing the Inverter to be
inconsistent with the country's certi󶎁cation.
Touching printed circuit boards or other static-sensitive components may cause
damage to the device.
• Avoid unnecessary circuit board contact.
• Comply with electrostatic protection regulations and wear anti-static
wristbands.
！CAUTION
NOTICE
1.3 Skills requirements for professional and technical personnel
All Installation operations must and only be performed by professional
technicians. Professional technicians must:
• After special training;
• Read this manual completely and master the operation-related safety matters;
• Familiar with local standards and relevant safety regulations for electrical
systems.

User Manual
4
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Set
2 Product description
2.1Grid-connected PV energy storage system
ST-INV-S3.0,ST-INV-S3.68,ST-INV-S4.0 and ST-INV-S5.0 are single-phase
transformerless string photovoltaic energy storage inverters, which are an
important part of photovoltaic power generation systems. The inverter converts
the DC power generated by the photovoltaic panels into AC power that meets the
grid requirements to supply the load, and the rest charges the battery and feeds it
into the grid.
The inverter is only suitable for the energy storage grid-connected power
generation system described in this article.
Since the inverter is a transformerless type, it is required that the positive and
negative poles of the PV string cannot be grounded, otherwise the inverter will
not operate normally.
The battery system case needs to be grounded.
WARNING
The typical application scenarios of inverter are shown in the following 󶎁gure.
A
C
E
F
G
DCBreaker
≥ 40A*1
ACBreaker
On-Gridload
CT*2
Back-upload
ToSmartMeter
ToBatteryCable
ACBreaker
PE
1
2
35
4
Model 1 2 3 4 5
ST-INV-S3.0
40A/600V DC
Breaker
50A/230V AC Breaker 32A/230V AC Breaker
Depends on
household
loads
ST-INV-S3.68
ST-INV-S4.0
ST-INV-S5.0 63A/230V AC Breaker
1.For batteries with attached breaker, the external DC breaker is not necessary.
2.Direction of the CT cannot be connected in reverse, please follow House
(K) → Grid (L) direction to do the connection.
B
D