Sofar 255KTL-HV-TRO User manual

Shenzhen SOFARSOLAR Co., Ltd.
Solar Grid-tied Inverter
Product Model: SOFAR 255KTL-HV-TRO
User manual

SOFAR 255KTL-HV-TRO User Manual
All copy reserved ©Shenzhen SOFARSOLAR Co., Ltd.
Contents
Preface ........................................................................................................................I
1. Basic Safety Information.............................................................................. - 1 -
1.1. Requirement for Installation and Maintenance............................- 1 -
1.2. Symbols and signs .......................................................................- 4 -
2. Product Characteristics................................................................................. - 6 -
2.1. Intended Use................................................................................- 6 -
2.2. Function Description ...................................................................- 9 -
2.3. Electrical block diagram............................................................- 11 -
3. Inverter Storage .......................................................................................... - 12 -
4. Installation.................................................................................................. - 13 -
4.1. Installation Process....................................................................- 13 -
4.2. Checking Before Installation.....................................................- 13 -
4.3. Tools ..........................................................................................- 15 -
4.4. Determining the Installation Position........................................- 17 -
4.5. Moving of inverter.....................................................................- 20 -
4.6. Installation .................................................................................- 22 -
5. Electrical Connection.................................................................................. - 27 -
5.1. Electrical Connection.................................................................- 28 -
5.2. Terminal Connector ...................................................................- 28 -
5.3. Grounding Connection (PE) ......................................................- 29 -
5.4. Connect grid side of inverter(AC-Output).................................- 30 -
5.4.2 Wiring Terminal and Precautions........................................... - 31 -
5.5. Connect the power cord of the tracking system (optional)........- 35 -
5.6. Connect PV side of inverter（DC-Input）................................- 36 -
5.7. Communication Connection......................................................- 39 -
6. Commissioning of inverter ......................................................................... - 45 -
6.1. Cable Connection Inspection.....................................................- 45 -
6.2. Start Inverter..............................................................................- 45 -
7. Operation interface ..................................................................................... - 46 -

SOFAR 255KTL-HV-TRO User Manual
All copy reserved ©Shenzhen SOFARSOLAR Co., Ltd.
7.1. Operation and Display Panel .....................................................- 46 -
7.2. Standard Interface......................................................................- 47 -
7.3. Main Interface............................................................................- 50 -
7.4. Updating Inverter Software .......................................................- 53 -
8. Trouble shooting and maintenance ............................................................. - 55 -
8.1. Troubleshooting.........................................................................- 55 -
8.2. Maintenance...............................................................................- 61 -
8.3. PID.............................................................................................- 61 -
8.4. SVG...........................................................................................- 62 -
9. Technical Data ............................................................................................ - 63 -
9.1. Input parameters (DC)...............................................................- 63 -
9.2. Output Parameter (AC)..............................................................- 64 -
9.3. Performance Parameter..............................................................- 65 -
9.4. General Data..............................................................................- 66 -
10. Quality Assurance................................................................................... - 67 -

SOFAR 255KTL-HV-TRO User Manual
All copy reserved ©Shenzhen SOFARSOLAR Co., Ltd.
I
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.
Document Updates
V1.1 2023-04-06
●Modified version
Shenzhen SOFARSOLAR Co., Ltd
Location: building 11, Gaoxinqi science and technology building, District
67,XingDong Community, XinAn Street, BaoAn District, Shenzhen, China.
Postcode: 518000
Company Website: www.sofarsolar.com
Email: [e-mail]

SOFAR 255KTL-HV-TRO User Manual
All copy reserved ©Shenzhen SOFARSOLAR Co., Ltd.
II
⚫Outline
This manual is an integral part of SOFAR 255KTL-HV-TRO. 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:
SOAFR 255KTL-HV-TRO
⚫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 255KTL-HV-TRO User Manual
- 1 -
Copyright © Shenzhen SOFARSOLAR Co., Ltd
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
255KTL-HV-TRO.
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 255KTL-HV-TRO 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.
Qualified Person
When inverter is working, it contains lethal voltages and went hot in some area.
Improper installation or misoperation could cause serial damage and injury. To
If you have any question or problem when you read the
following information, please contact Shenzhen
SOFARSOLAR CO., Ltd.
Note

SOFAR 255KTL-HV-TRO User Manual
- 2 -
Copyright © Shenzhen SOFARSOLAR Co., Ltd
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 255KTL-HV-TRO 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 255KTL-HV-TRO has warming symbol attache 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%.
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

SOFAR 255KTL-HV-TRO User Manual
- 3 -
Copyright © Shenzhen SOFARSOLAR Co., Ltd
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 if 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.
Keep it away from kids !
Attention
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

SOFAR 255KTL-HV-TRO User Manual
- 4 -
Copyright © Shenzhen SOFARSOLAR Co., Ltd
Inverter should not work again until removing all faults. If any
repair work is required, please contact local authorized service
centre.
Should not open the inverter cover without authorized permit,
SOFARSOALR 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;
Danger
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

SOFAR 255KTL-HV-TRO User Manual
- 5 -
Copyright © Shenzhen SOFARSOLAR Co., Ltd
Signs on the Product and on the Type Label
SOFAR 255KTL-HV-TRO 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 10 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
Comply with the
Conformite Euroeenne
(CE) Certification
The product comply 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 255KTL-HV-TRO User Manual
- 6 -
Copyright © Shenzhen SOFARSOLAR Co., Ltd
2.Product Characteristics
Outlines of this Chapter
Product Dimensions
Introduce the filed of use and the dimensions of the product.
Function Description
Introduce working principle and internal components.
Efficiency Curves
Introduce the efficiency curves of the product.
2.1. Intended Use
SOFAR 255KTL-HV-TRO is a transformerless on grid PV inverter, that
converters the direct current of the PV array to the grid-compliant, three-phase
current and feeds into the utility grid.
Figures 2-1PV Grid-Tied System
SOFAR 255KTL-HV-TRO 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,
batteries will against the warranty condition and SOFARSOLAR will not take the

SOFAR 255KTL-HV-TRO User Manual
- 7 -
Copyright © Shenzhen SOFARSOLAR Co., Ltd
responsibility.
Supported grid types
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 255KTL-HV-TRO
L×W×H=1100.5*713.5*368mm

SOFAR 255KTL-HV-TRO User Manual
- 8 -
Copyright © Shenzhen SOFARSOLAR Co., Ltd
Figure 2-2 Product front view and left view dimensions

SOFAR 255KTL-HV-TRO User Manual
- 9 -
Copyright © Shenzhen SOFARSOLAR Co., Ltd
Figure 2-3 Product back view and bracket dimensions
◆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 2-4 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

SOFAR 255KTL-HV-TRO User Manual
- 10 -
Copyright © Shenzhen SOFARSOLAR Co., Ltd
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.
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 the grid company 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 Wi-Fior PLC.`
F. Software update
USB interface for uploading the firmware, remotely uploading is available.
G. PID （optional function）
The PID effect can be recovered at night to protect the PV modules.
H. H. AFCI (optional function)
When the DC connector is not assembled in place, it is easy to cause arcing or
overheating of the connector. This function can detect whether there is a fault arc
at the input end of the inverter. When an arc occurs, the inverter stops grid
connection and gives an alarm reminder, so as to build a safe barrier for the whole

SOFAR 255KTL-HV-TRO User Manual
- 11 -
Copyright © Shenzhen SOFARSOLAR Co., Ltd
system.
2.3. Electrical block diagram
SOFAR 255KTL-HV-TRO has 16-24 DC input strings. 8-12 MPPT trackers that
converters the direct current of PV array to grid-compliant, three phase current and
feeds in into the utility grid. Both DC and AC side has Surge Protection Device
(SPD).

SOFAR 255KTL-HV-TRO User Manual
- 12 -
Copyright © Shenzhen SOFARSOLAR Co., Ltd
3.Inverter Storage
If inverter is not installing immediately, storage condition need meet below
requirements:
⚫Place inverter into the original package and leave desiccant inside, sealed
tight with taps.
⚫Keep the storage temperature around -40℃～70℃, Relative humidity 0～
95%, no condensation.
Figure 3-1Storage temperature and humidity
⚫The maximum stacking layer number cannot exceed 4 layers.
⚫If the inverter be storage for more than half years, the inverter needs to be
fully examined and tested by qualified service or technical personnel before
using.

SOFAR 255KTL-HV-TRO User Manual
- 13 -
Copyright © Shenzhen SOFARSOLAR Co., Ltd
4.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
4.1. Installation Process
4.2. 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
After unpacking, please check according to following table, to see whether all the

SOFAR 255KTL-HV-TRO User Manual
- 14 -
Copyright © Shenzhen SOFARSOLAR Co., Ltd
parts were included in the packing, please contact your distributor immediately if
anything missing or damage.
Table 4-1Components and mechanical parts that inside the package
No
Pictures
Description
Quantity
1
SOFAR 255KTL-HV-TRO
1 pcs
2
Rear Panel
1 pcs
3
PV+ input connector
24 pcs
4
PV- input connector
24 pcs
5
PV+ metal pin
24 pcs
6
PV- metal pin
24 pcs
7
M10*90Hexagon screws
4 pcs

SOFAR 255KTL-HV-TRO User Manual
- 15 -
Copyright © Shenzhen SOFARSOLAR Co., Ltd
8
M6*30 Hexagon screws
2 pcs
9
Manual
1 pcs
10
Warranty Card
1 pcs
11
Outgoing inspection report
1 pcs
12
Quality Certificate
1 pcs
13
COM 16pin connector
1 pcs
14
M12 Hand ring
2pcs
4.3. Tools
Prepare tools required for installation and electrical connection as following table: