Sofar 250KTL-HV User manual

SOFAR 250/255KTL-HV User Manual
All copy reserved ©Shenzhen SOFARSOLAR Co., Ltd.
I

SOFAR 250/255KTL-HV User Manual
All copy reserved ©Shenzhen SOFARSOLAR Co., Ltd.
I
Contents
Preface .................................................................................................................. - 1 -
1. Basic Safety Information ................................................................................ - 3 -
1.1. Requirement for Installation and Maintenance ..........................- 3 -
1.2. Symbols and signs ......................................................................... - 7 -
2. Product Characteristics .................................................................................. - 9 -
2.1. Intended Use ................................................................................... - 9 -
2.2. Function Description .................................................................... - 12 -
2.3. Electrical block diagram .............................................................. - 15 -
3. Inverter Storage .............................................................................................- 17 -
4. Installation ...................................................................................................... - 18 -
4.1. Installation Process ...................................................................... - 18 -
4.2. Checking Before Installation .......................................................- 18 -
4.3. Tools ................................................................................................- 21 -
4.4. Determining the Installation Position .........................................- 23 -
4.5. Moving of inverter ......................................................................... - 26 -
4.6. Installation ......................................................................................- 28 -
5. Electrical Connection ....................................................................................- 33 -
5.1. Electrical Connection ................................................................... - 34 -
5.2. Terminal Connector ...................................................................... - 34 -
5.3. Grounding Connection (PE) ....................................................... - 35 -
5.4. Connect grid side of inverter(AC-Output) .................................- 37 -
5.5. Connect the power cord of the tracking system (optional) ....- 44 -
5.6. Connect PV side of inverter（DC-Input）................................- 46 -
5.7. Communication Connection ....................................................... - 50 -
6. Commissioning of inverter ........................................................................... - 54 -
6.1. Cable Connection Inspection ........................................................- 54 -
6.2. Start Inverter ..................................................................................- 55 -
7. SOFAR Monitor APP(Optional) ................................................................... - 56 -

SOFAR 250/255KTL-HV User Manual
All copy reserved ©Shenzhen SOFARSOLAR Co., Ltd.
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7.1.Download ........................................................................................ - 56 -
7.2. Account Registration and Login ....................................................- 57 -
7.3. Local Control ...................................................................................- 59 -
7.4. About the Software .........................................................................- 64 -
8. Operation interface ....................................................................................... - 66 -
8.1. Operation and Display Panel ......................................................- 66 -
8.2. Standard Interface ........................................................................- 67 -
8.3. Main Interface ............................................................................... - 70 -
8.4. Updating Inverter Software ......................................................... - 73 -
9. Trouble shooting and maintenance ............................................................ - 75 -
9.1. Normal outage power down operation ......................................- 75 -
9.2. Fault power-down operation ....................................................... - 75 -
9.3. Confirmation of troubleshooting site information .................... - 76 -
9.4. Maintenance ..................................................................................- 87 -
9.5. Fan Maintenance and Replacement Instructions ....................... - 89 -
10. Technical Data ............................................................................................. - 94 -
10.1. Input parameters (DC) ...............................................................- 95 -
10.2. Output Parameter (AC) ............................................................. - 96 -
10.3. Performance Parameter ............................................................- 97 -
10.4. General Data ...............................................................................- 98 -
11. Quality Assurance ....................................................................................... - 99 -

SOFAR 250/255KTL-HV User Manual
Copyright © Shenzhen SOFARSOLAR Co., Ltd
- 1 -
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
www.sofarsolar.com for lasted version.
Document Updates
V1.3 2023-09-19
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]
Outline
This manual is an integral part of SOFAR 250/255KTL-HV. It describes the
assembly, installation, commissioning ,maintenance and failure of the

SOFAR 250/255KTL-HV User Manual
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product. Please read it carefully before operating.
Scope of Validity
This manual contains important instructions for:
SOFAR 250KTL-HV、SOAFR 255KTL-HV
Target Group
This manual is for qualified electricians. The tasks described in this manual
only can be performed by qualified electricians.
Symbols Used
In order to ensure the safety of the user's person and property when using
the PV grid-connected inverter, as well as the efficient use of this product,
relevant safety operation information is provided in the manual and
highlighted with the appropriate symbols. It is important that you fully
understand and absolutely comply with this emphasized information to
avoid personal injury and property damage. The symbols used in this
manual are listed 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

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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
250/255KTL-HV.
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 250/255KTL-HV 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.
Prior to installing and maintaining the equipment, a DC switch should be
utilized to disconnect the high voltage DC from the PV array; otherwise, the
resulting high voltage may cause serious injury.
If you have any question or problem when you read the
following information, please contact Shenzhen SOFARSOLAR
CO., Ltd.
Note

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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 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 250/255KTL-HV 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 250/255KTL-HV 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%.

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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 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

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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
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

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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
Signs on the Product and on the Type Label
SOFAR 250/255KTL-HV 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

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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.

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2.Product Characteristics
Outlines of this Chapter
The following are the areas of use and overall dimensions of the SOFAR 2
50/255KTL-HV inverter; the principle of operation of the SOFAR 250/255K
TL-HV inverter and its internal functional modules; and the circuit topology
of the inverter.
2.1. Intended Use
SOFAR 250/255KTL-HV 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.
PV Module Inverter Transformer Grid
Figures 2-1 PV Grid-Tied System
SOFAR 250/255KTL-HV 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 responsibility.
Supported grid types

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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 250/255KTL-HV
L×W×H=1100.5*713.5*368mm
Figure 2-2 Product front view and left view dimensions

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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

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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.
2.2.1 PID Function
When the inverter is running, the PID function module increases the
potential between the negative pole of the photovoltaic array and the
ground to a positive value to suppress the PID effect.
Note
1. Before enabling the PID recovery function, ensure that the polarity of the
PV module's ground voltage meets requirements. If in doubt, please
contact the PV module manufacturer or read their corresponding user
manual.
2. If the voltage scheme of the PID protection/recovery function does not
meet the requirements of the corresponding PV module, the PID function
cannot work properly or may even damage the PV module.
3. Before enabling the reverse PID function, ensure that the inverter has
been applied to the IT system.

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4. When the inverter is not running, the PID module will apply reverse
voltage to the photovoltaic module to restore the degraded module.
5. If the PID recovery function is enabled, the PID works only at night.
6. After the PID recovery function is enabled, the PV series voltage to
ground is 800Vdc by default. You can change the default value through the
App.
2.2.2 SVG function
The inverter is a four-quadrant operation, through the rectification mode, to
maintain the bus voltage to ensure the machine loss, and at the same time
output reactive power to maintain the reactive power loss of the grid;
The nighttime SVG function of the inverter operates in the condition of no
input voltage, firstly, it needs to enable both "real-time reactive power
control enable bit" and "SVG enable bit", when the DC input voltage
decreases to the set threshold, the inverter starts to operate from the
"grid-connected mode". When the DC input voltage drops to the set
threshold, the inverter starts to switch from "Grid-connected mode" to
"Night SVG mode", and the desired reactive power output can be controlled
through the APP, while the inverter stays in the "Night SVG mode" mode.
Currently, the SOFAR 255KTL-HV has a reactive power range of -76 kVar
to +76 kVar.
Set up the SVG
The night SVG function can be set through the Bluetooth APP of Shouhang,
as shown in the following figure, click "Operation and Maintenance" ->
"Power Control" -> "SVG Enable Bit" -> "Fixed Reactive Power Level under
Night Grid Connection" to set the reactive power level. Click
"O&M"->"Power Control"->"SVG Enable Position"->"Fixed Reactive Power
Size under Night Grid Connection" to set the reactive power size.

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When the inverter is running in "Night Q" mode, two working modes can be
selected via "SVG Reactive Power Enable Bit": Fixed Reactive Power
Mode (not enabled by default), i.e., set the percentage of reactive power
output, and the inverter continuously outputs a fixed amount of reactive
power according to the setting. The inverter continuously outputs a fixed
amount of reactive power according to the setting. The other one is the
power factor mode, which, when enabled, calculates the corresponding
amount of reactive power through the set power factor value.
Attention:
After turning on the SVG enable, the inverter can continue grid-connected
operation at night and can respond to reactive power dispatch commands
to save reactive static compensator investment cost.
1. It is necessary to turn on the SVG enable bit when the PV has power. If
the SVG is enabled at night, the inverter cannot start grid connection at
night. If in doubt, please contact the PV module manufacturer or read its
corresponding user manual.
2. When the inverter is running in SVG state, the display panel will indicate
"SVG state".
3. In the SVG state, the maximum reactive power of the inverter is 30% of
the maximum apparent power.
4. SVG only works at night, if the PV has power, the inverter will switch to
"grid-connected state" by itself.

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2.2.3 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-Fi or
PLC.
F. Software update
USB interface for uploading the firmware, remotely uploading is available.
G.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 system.
2.3. Electrical block diagram
SOFAR 250/255KTL-HV has 16-24 DC input strings. 8-12 MPPT trackers

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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).
Figure 2-5 Schematic diagram

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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
5～95%, 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.