Sofar solar KTLX-G3 Series User manual

Shenzhen SOFARSOLAR CO., Ltd.
User manual
Solar Grid-tied Inverter
Product Model: SOFAR 15~24KTLX-G3

SOFAR 15~24KTLX-G3 User manual
Copyright © Shenzhen SOFARSOLAR Co., Ltd.
I
Catalog
Preface .......................................................................................................................II
1. Basic Safety Information ................................................................................... - 1 -
1.1. Requirement for Installation and Maintenance................................- 1 -
1.2. Symbols and signs .............................................................................- 4 -
2. Product Characteristics ..................................................................................... - 7 -
2.1. Intended Use.....................................................................................- 7 -
2.2. Function Description.......................................................................- 11 -
2.3. Electrical block diagram ..................................................................- 12 -
2.4. Efficiency and derating curve..........................................................- 13 -
3. Installation....................................................................................................... - 14 -
3.1. Installation Process .........................................................................- 14 -
3.2. Checking Before Installation............................................................- 14 -
3.3. Tools ................................................................................................- 17 -
3.4. Determining the Installation Position .............................................- 18 -
3.5. Moving of inverter...........................................................................- 20 -
3.6. Installation.......................................................................................- 21 -
4. Electrical Connection ...................................................................................... - 23 -
4.1. Electrical Connection.......................................................................- 24 -
4.2. Grounding Connection (PE).............................................................- 24 -
4.3. Connect grid side of inverter (AC-Output) ......................................- 26 -
4.4. Connect PV side of inverter (DC-Input)...........................................- 30 -
4.5. Communication Connection............................................................- 32 -
5. Commissioning of inverter .............................................................................. - 37 -
5.1. Cable Connection Inspection ..........................................................- 37 -
5.2. Start Inverter...................................................................................- 37 -
6. Operation interface......................................................................................... - 39 -
6.1. Operation and Display Panel...........................................................- 39 -
6.2. Standard Interface...........................................................................- 40 -
6.3. Main Interface.................................................................................- 42 -
6.4. Updating Inverter Software.............................................................- 46 -
7. Trouble shooting and maintenance ................................................................ - 48 -
7.1. Troubleshooting ..............................................................................- 48 -
7.2. Maintenance ...................................................................................- 62 -
7.3. Fan Maintenance.............................................................................- 63 -
8. Technical Data ................................................................................................. - 64 -
9. Quality Assurance ........................................................................................... - 68 -

SOFAR 15~24KTLX-G3 User manual
Copyright © Shenzhen SOFARSOLAR Co., Ltd.
II
Preface
Notice
The products, services or features you purchased shall be subject to the company's
commercial contracts and terms. All or part of the products and services described
in this document may not within the scope of your purchase. Unless additional
terms and conditions in your contract, the company does not make any statement
or guarantee on the contents of this document.
Save this Instruction
This manual must be considered as an integral part of the equipment. Customer
can print the electronic version to hard copy and keeping properly for future
reference. Anyone who operates the device at any time must operate in
accordance with the requirements of this manual.
Copyright Declaration
The copyright of this manual belongs to Shenzhen SOFARSOLAR Co., Ltd. Any
corporation or individual should not plagiarize, partially cope or fully copy
(including software, etc.), not allow to duplication and publishment in any form
and any way. All rights reserved, SOFARSOLAR reserves the right of final
interpretation. This manual subject to modify according to user's or customer's
feedback. Please check our website at http://www.sofarsolar.com for lasted
version.
Shenzhen SOFARSOLAR Co., Ltd
Location: 401, Building 4, Antongda Industrial Park, District 68, XingDong
Community, XinAn Street, BaoAn District, Shenzhen, China.
Postcode：518000
Company Website：www.sofarsolar.com
Email：[e-mail]

SOFAR 15~24KTLX-G3 User manual
Copyright © Shenzhen SOFARSOLAR Co., Ltd.
III
⚫Outline
This manual is an integral part of SOFAR 15~24KTLX-G3. It describes the assembly,
installation, commissioning, maintenance and failure of the product. Please read it
carefully before operating.
⚫Scope of Validity
This manual contains important instructions for:
SOFAR 15KTLX-G3 SOFAR 17KTLX-G3 SOFAR 20KTLX-G3 SOFAR 22KTLX-G3
SOFAR 24KTLX-G3
⚫Target Group
This manual is for qualified electricians. The tasks described in this manual only can
be performed by qualified electricians.
⚫Symbols Used
The following types of safety instruction and general information appear in this
document as described below:
“Danger ”indicates a hazardous situation which, if not
avoided, will result in death or serious injury.
Danger
“Warning”indicates a hazardous situation which, if not
avoided, could result in death or serious injury
Warning
“Caution ”indicates a hazardous situation which, if not
avoided, could result in minor or moderate injury
Caution
“Attention”indicates there are potential risks, if fail to
prevent, may lead to equipment cannot normally or property
damage.
Attention
“Note”provides additional information and tips that are
valuable for the optimal operation of the product.
Note

SOFAR 15~24KTLX-G3 User manual
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1.Basic Safety Information
Outlines of this Chapter
Please read the instruction carefully. Faulty operation may cause serious injury
or death.
Safety Instruction
Introduce the safety instruction during installation and operation of SOFAR
15~24KTLX-G3
Symbols Instruction
This section gives an explanation of all the symbols shown on the inverter and on
the type label.
1.1. Requirement for Installation and Maintenance
Installation of SOFAR 15~24KTLX-G3 on-grid inverter must conform with laws,
regulations, codes and standards applicable in the jurisdiction.
Before installing and adjusting the produce, please read all of instructions, cautions
and warnings in this manual
Before connecting the product to the electrical utility grid, contact the local utility
company for allowance. Also, this connection must be made only by qualified
electrician.
If the failure persists, please contact the nearest authorized maintenance center. If
you don't know which service center is closest to you, please contact your local
distributor. Don't repair the product by yourself, which may lead serious injury or
damage.
If you have any question or problem when you read the
following information, please contact Shenzhen SOFARSOLAR
CO., Ltd.
Note

SOFAR 15~24KTLX-G3 User manual
Copyright © Shenzhen SOFARSOLAR Co., Ltd.
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Qualified Person
When inverter is working, it contains lethal voltages and went hot in some area.
Improper installation or maloperation could cause serial damage and injury. To
reduce the risk of personal injury and to ensure the safe installation and operation
of the product, only a qualified electrician is allowed to execute transportation,
installation, commissioning and maintenance. Shenzhen SOFARSOLAR Co, Ltd does
not take any responsibility for the property destruction and personal injury
because of any incorrect use.
Label and Symbols
SOFAR 15~24KTLX-G3 has type label attach the side of product which contact
important information and technical data, the type label must permanent attached
to the product.
SOFAR 15~24KTLX-G3 has warming symbol attached the product which contact
information of safety operation. The warming symbol must permanent attached to
the product.
Installation location requirement
Please install the inverter according to the following section. Place inverter in an
appropriate bearing capacity objects (such as solid brick wall, or strength
equivalent mounting surface, etc.) and make sure inverter vertical placed. A proper
installation location must have enough space for fire engine access in order for
maintenance if faulty occur. Ensure the inverter is installed in a wall ventilated
environment and have enough air-cooling cycle. Air humidity should less than 90%.

SOFAR 15~24KTLX-G3 User manual
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Transportation Requirement
Inverter is in the good electrical and physical condition when it ship out from
factory. During transport, inverter must be placed in its original package or other
proper package. Transportation company should responsible for any damage
during transport period.
If you find any packing problems that may cause the damage of inverter or any
visible damage, please notice the responsible transportation company immediately.
You can ask your installer or SOFARSOLAR for help is necessary.
Electrical Connection
Please comply with all the current electrical regulations about accident prevention
in dealing with the current inverter.
Before the electrical connection, use opaque material to cover the PV
modules or disconnect PV string DC switch. PV arrays will produce
dangerous voltage if it is exposure under sun
Danger
All operation must accomplish by certified electrical engineer
⚫Must be trained;
⚫Completely read the manual operation and understand all
information
Warming
Must get permission by local utility company before connecting to
grid and the connection must be done by certified electrical
engineers
Attention
Operation
Touching the utility grid or the terminal conductors can lead to lethal
electric shock or fire!
Do not touch non-insulated cable ends, DC conductors and any live
components of the inverter.
Attention to any electrical relevant instruction and document.
Danger
Enclosure or internal components may get hot during operation. Do
not touch hot surface or wear insulated gloves.
Attention

SOFAR 15~24KTLX-G3 User manual
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Maintenance and repair
Before any repair work, turn OFF the AC circuit breaker between the
inverter and electrical grid first, then turn OFF the DC switch.
After turning OFF the AC circuit breaker and DC switch wait for at least
5 minutes before carry any maintenance or repair work.
Danger
Inverter should not work again until removing all faults. If any repair
work is required, please contact local authorized service center.
Should not open the inverter cover without authorized permit,
SOFARSOLAR does not take any responsibility for that.
Attention
EMC/Noise Level
Electromagnetic compatibility (EMC) refers to that on electrical equipment
functions in a given electromagnetic environment without any trouble or error, and
impose no unacceptable effect upon the environment. Therefore, EMC represents
the quality characters of an electrical equipment.
⚫The inherent noise-immune character: immunity to internal electrical noise
⚫External noise immunity: immunity to electromagnetic noise of external
system
⚫Noise emission level: influence of electromagnetic emission upon
environment
Electromagnetic radiation from inverter may be harmful to health!
Please do not continue to stay away from the inverter in less than
20cm when inverter is working
Danger
1.2. Symbols and signs
High voltage of inverter may be harmful to health!
Only certified engineer can operate the product;
Juveniles, Disable, should not use this product;
Keep this product out of the reach of children;
Danger

SOFAR 15~24KTLX-G3 User manual
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Caution of burn injuries due to hot enclosure!
Only touch the screen and pressing key of the inverter while it is
working
Caution
PV array should be grounded in accordance to the requirements of
the local electrical grid company
Attention
Ensure the maximum DC voltage input is less than the maximum
inverter DC voltage (including in low temperature condition). Any
damage cause by overvoltage, SOFARSOLAR will not take the
responsibility including warranty
Warning
Signs on the Product and on the Type Label
SOFAR 15~24KTLX-G3 has some safety symbols on the inverter. Please read and
fully understand the content of the symbols before installation.
Symbols
Name
Explanation
This is a residual voltage in
the inverter!
After disconnect with the DC side,
there is a residual voltage in the
inverter, operator should wait for 5
minutes to ensure the capacitor is
completely discharged.
Caution of high voltage and
electric shock
The products operates at high
voltages. Prior to performing any work
on the product, disconnect the
product from voltage sources. All work
on the product must be carried out by
qualified persons only.
Caution of hot surface
The product can get hot during
operation. Avoid contact during
operation. Prior to performing any
work on the product, allow the
product to cool down sufficiently

SOFAR 15~24KTLX-G3 User manual
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Comply with the
Conformite Euroeenne (CE)
Certification
The product complies with the CE
Certification
Grounding Terminal
This symbol indicates the position for
the connections of an additional
equipment grounding conductor
Observe the
documentation
Read all documentation supplied with
the product before install
Positive pole and negative
pole
Positive pole and negative pole of the
input voltage (DC)
Temperature
Indicated the temperature allowance
range
RCM logo
RCM (Regulatory Compliance Mark)
The product complies with the
requirements of the applicable
Australian standards.

SOFAR 15~24KTLX-G3 User manual
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2.Product Characteristics
Outlines of this Chapter
Product Dimensions
Introduce the field of use and the dimensions of the product
Function Description
Introduce working principle and internal components of the product
Efficiency Curves
Introduce the efficiency curves of the product
2.1. Intended Use
Field of use
SOFAR 15~24KTLX-G3 is a transformer-less on grid PV inverter, that converters
the direct current of the PV panels to the grid-compliant, three-phase current and
feeds into the utility grid.
Figure 2-1 PV Grid-Tied System
SOFAR 15~24KTLX-G3 may only be operated with PV arrays (photovoltaic
module and cabling) for on grid condition. Do not use this product for any other or
additional purposes. Any damage or property loss due to any use of the product
other than described in this section, SOFARSOLAR will not take the responsibility.
DC input of the product must be PV module, other source such like DC sources,

SOFAR 15~24KTLX-G3 User manual
Copyright © Shenzhen SOFARSOLAR Co., Ltd.
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batteries will against the warranty condition and SOFARSOLAR will not take the
responsibility.
Intended grid types
SOFAR 15~24KTLX-G3 configurations. For the TT type of electricity grid，the
voltage between neutral and earth should be less than 30V. inverters are
compatible with TN-S, TN-C, TN-C-S, TT, IT grid.
Figure2-2 Overview of the grid configurations
SOFAR Inverters
SOFAR Inverters
SOFAR Inverters
SOFAR Inverters
SOFAR Inverters

SOFAR 15~24KTLX-G3 User manual
Copyright © Shenzhen SOFARSOLAR Co., Ltd.
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Product Dimensions
The choice of optional parts of inverter should be made by a qualified
technician who knows the installation conditions clearly.
Dimensions Description
◆SOFAR 15KTLX-G3、17KTLX-G3、20KTLX-G3、22KTLX-G3、24KTLX-G3
L×W×H=520*430*189mm
Figure 2-3 Front, side and back of the machine (15~24K)
Figure 2-4a Bottom view(15~17K) Figure 2-4b Bottom view(20~24K)
Note: 15~24K supports 4-channel PV string input.
Figure 2-5 bracket dimensions

SOFAR 15~24KTLX-G3 User manual
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Function description of inverter box bottom
1. DC Switch
2. DC negative poles connecters
3. DC positive poles connecters
4. USB Port (for WIFI or Ethernet communication)
5. Breather valve
6. COM Port (for RS485 communication)
7. AC output
8. Fans
Figure 2-6 Bottom view of the SOFAR 15~24KTLX-G3
8
1 2 3 4 5 6 7

SOFAR 15~24KTLX-G3 User manual
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Labels on the equipment
Note: label must NOT be hidden with objects and extraneous parts (rags, boxes, equipment,
etc.,); they must be cleaned regularly and kept visible at all times.
Figure 2-7 Product label
2.2. Function Description
DC power generated by PV arrays is filtered through Input Board then enter Power
Board. Input Board also offer functions such as insulation impedance detection and
input DC voltage/ current detection. DC power is converted to AC power by Power
Board. AC power is filtered through Output Board then AC power is fed into the
grid. Output Board also offer functions such as grid voltage/ output current
detection, GFCI and output isolation relay. Control Board provides the auxiliary
power, controls the operation state of inverter and shows the operation status by
Display Board. Display Board displays fault code when inverter is abnormal
operation conditions. At the same time, Control Board can trigger the replay to
protect the internal components.

SOFAR 15~24KTLX-G3 User manual
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Function Module
A. Energy management unit
Remote control to start/ shunt down inverter through an external control
B. Feeding reactive power into the grid
The inverter is able to produce reactive power thus to feed it into the grid
through the setting of the phase shift factor. Feed-in management can be
controlled directly by APP or through a RS485 interface.
C. Limited the active power fed into grid
If enable the limited of active power function, inverter can limit the amount of
active power fed into the grid to the desired value (expressed as percentage)
D. Self-power reduction when grid is over frequency
If grid frequency is higher than the limited value, inverter will reduce the
output power to ensure the grid stability
E. Data transmission
Inverter or a group of inverters can be monitored remotely through an
advanced communication system based on RS485 interface or via USB port.
F. Software update
USB interface for uploading the firmware, remotely uploading by using USB
acquisition stick (WIFI or Ethernet) is also available.
2.3. Electrical block diagram
+
+
-
-
+
+
-
-
Input
EMC
Circuit
MPPT
Circuit 1
MPPT
Circuit 2
AC
Inverter
Circuit
Output
Filter
Circuit Relay Protect
Circuit
Output
EMC
Circuit
R
S
T
PE
Ⅰ Ⅱ Ⅲ Ⅳ Ⅴ
N
PV1
PV2
PV
Input
Port
Figure 2-8 Schematic diagram

SOFAR 15~24KTLX-G3 User manual
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2.4. Efficiency and derating curve
Figure 2-9 Power efficiency curve (take 20K for example)
Figure 2-10 Rated Power ratio vs Grid Voltage
0
20
40
60
80
100
120
180 190 200 210 220 230 240 250 260 270 280 290 300
%of Rated Output Power
Vgrid (V)

SOFAR 15~24KTLX-G3 User manual
Copyright © Shenzhen SOFARSOLAR Co., Ltd.
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3.Installation
Outlines of this Chapter
This topic describes how to install this product, please read carefully before
install.
Do NOT install the product on flammable material
Do NOT store this product in potentially explosive atmospheres
Dangers
The enclosure and heat sink will get hot during operation, please
do not mount the product at a easy to reach location
Caution
Consider the weight of this product when doing transport and
moving
Choose an appropriate mounting position and surface
At least two persons for installation
Attention
3.1. Installation Process
3.2. Checking Before Installation
Checking Outer Packing Materials
Before unpacking, please check the condition of the outer package materials if any
damaged found, such as holes, cracks, please not unpack the product, contact your
distributor immediately. Recommend installing the product within 24 hours after
unpacking the package.
Checking Deliverable

SOFAR 15~24KTLX-G3 User manual
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After unpacking, please check according to following table, to see whether all the
parts were included in the packing, please contact your distributor immediately if
anything missing or damage.
Figure 3-1Components and mechanical parts that inside the package
No
Pictures
Description
Quantity
1
SOFAR 15~24KTLX-G3
1 PCS
2
Rear Panel
1 PCS
3
M8*10 Hexagon screws
3 PCS
4
PV+ input connector
4 PCS
5
PV- input connector
4PCS
6
PV+ metal pin
4PCS

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7
PV- metal pin
4PCS
8
M6*30 Hexagon screws
1 PCS
9
Manual
1PCS
10
Warranty Card
1PCS
11
Quality Certificate
1PCS
12
R-type terminal
5PCS
13
Communication
Terminal
1PCS
14
USB acquisition stick
(WIFI/Ethernet)
1 PCS (Optional)