Sunways STS-3KTL User manual

Grid-connected PV Inverter
Single Phase Dual MPPT
User Manual
Ningbo Sunways Technologies Co., Ltd.
STS-3K/3.6K/4.2K/4.6K/5K/6KTL

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 ......................................................................................................5
2.3 Important Safety Matters .............................................................................6
2.4 Symbols Explanation ....................................................................................7
3. Product Introduction ...........................................................................................9
3.1 Basic Features ...............................................................................................9
3.2 Appearance Introduction ...........................................................................10
3.3 Display Interface .........................................................................................12
3.4 Packing list...................................................................................................13
4. Product Installation ............................................................................................13
4.1 Selection of Installation Location ..............................................................13
4.2 Mounting the Inverter .................................................................................15
4.3 Electrical Connection .................................................................................17
4.4 Monitoring Device Installation ...................................................................22
4.5 Power Limiting Device & DRED Connection ..............................................23
4.6 System Layout of Units Without Integrated DC Switch ............................25
5. Start and Stop .......................................................................................................25
5.1 Start the Inverter .........................................................................................25
5.2 Stop the Inverter .........................................................................................25
6. General Operation ...............................................................................................26
6.1 Display Operation .......................................................................................26
7. Troubleshooting...................................................................................................27
7.1 Fault Messages ............................................................................................27
8. Technical Parameters ........................................................................................28

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]

1.Preface
1.1 Overview
This manual is an integral part of Sunways STS 3-6kW series single-phase inverters (hereinafter
referred to as the inverters). It mainly introduces the assembly, installation, electrical
connection, debugging, maintenance and troubleshooting of the products. Before installing
and using inverters, please read this manual carefully, understand the safety information and
be familiar with the functions and characteristics of inverters.
1.2 Target Groups
This manual is applicable to the electrical installers with professional quali󽗉cations and the
people who bought this inverter. 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 When installing, do not touch any part 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.
2.2 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.
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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 of running in an environment that does not meet the requirements stated in
the document.
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 process of installation and operation which don’t follow the
local standards and regulations.
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:
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.
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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.
SAA certi󽗉cation.
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.
2.4 Symbols Explanation
This chapter mainly elaborates the symbols displayed on the inverter, nameplate and packing
box.
2.4.1 Symbols on the Inverter
Inverter status indicator.
Description
Symbol
Inverter running indicator.
Grounding symbol, the inverter casing needs to be properly
grounded.
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8
Handle with care.
DescriptionSymbol
This side up.
Keep dry.
Stacked layers.
2.4.3 Symbol on the Packing box

Figure 3-1 Applicable grid type
STS Single Phase STS Single Phase
STS Single Phase STS Single Phase
3. Product Introduction
3.1 Basic Features
3.1.1 Function
The Sunways STS 3~6kW series is a single-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 The STS 3~6kW series inverter contains 6 models which are list below:
STS-3KTL, STS-3.6KTL STS-4.2KTL, STS-4.6KTL, STS-5KTL, STS-6KTL.
3.1.3 Applicable grid type
The applicable grid types for the Sunways STS 3~6kW 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:
3.1.4 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.
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Figure 3- 2 Front view
Figure 3- 3 Side view
3.2 Appearance Introduction
3.2.1 Inverter front view, as shown in Figure 3- 2:
3.2.2 Inverter side view, as shown in Figure 3-3:
360mm
410mm
Logo
Display
Name
Plate
360mm
120mm
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