Sofar 1.1KTL2-G3 User manual

SOFAR 1~4KTL2-G3 User manual
Copyright © Shenzhen SOFARSOLAR Co., Ltd
I

SOFAR 1~4KTL2-G3 User manual
Copyright © Shenzhen SOFARSOLAR Co., Ltd
I
Contents
Preface..........................................................................................................................................................III
1. Basic safety information........................................................................................................ - 1 -
1.1. Safety instructions.......................................................................................................- 1 -
1.2. Symbols and signs.......................................................................................................- 5 -
2. Product characteristics...........................................................................................................- 7 -
2.1. Product dimensions ................................................................................................... - 7 -
2.2. Function characteristics....................................................................................... - 10 -
2.3. Efficiency curve...........................................................................................................- 12 -
3. Installation....................................................................................................................................- 13 -
3.1. Installation Process .................................................................................................. - 13 -
3.2. Checking Before Installation.............................................................................- 14 -
3.3. Product Overview......................................................................................................- 16 -
3.4. Tools....................................................................................................................................- 17 -
3.5. Determining the Installation Position........................................................ - 19 -
3.6. Moving the SOFAR 1~4KTL2-G3......................................................................- 21 -
3.7. Installing SOFAR 1~4KTL2-G3...........................................................................- 22 -
4. Electrical Connections..........................................................................................................- 24 -
4.1. Electrical connection..............................................................................................- 25 -
4.2. Connecting PGND Cables....................................................................................- 26 -
4.3. Connecting DC Input Power Cables ............................................................ - 27 -
4.4. Connecting AC Output Power Cables ........................................................ - 30 -
4.5. RS485,CT,inverter logic interface connection....................................... - 38 -
4.6. WIFI/GPRS module installation procedure............................................. - 45 -
4.7. Communication method.....................................................................................- 45 -
5. Commissioning of inverter................................................................................................- 49 -
5.1. Safety inspection before commissioning .................................................- 49 -
5.2. Start inverter.................................................................................................................- 49 -
6. Operation interface................................................................................................................ - 51 -
6.1. Operation and Display Panel............................................................................ - 51 -
6.2. Standard Interface....................................................................................................- 52 -
6.3. Main Interface..............................................................................................................- 55 -

SOFAR 1~4KTL2-G3 User manual
Copyright © Shenzhen SOFARSOLAR Co., Ltd
II
6.4. Update Software online........................................................................................- 61 -
7. Trouble shooting...................................................................................................................... - 63 -
7.1. Trouble shooting........................................................................................................- 63 -
7.2. Maintenance.................................................................................................................- 71 -
8. Technical data............................................................................................................................- 73 -
8.1. Input parameters (DC)...........................................................................................- 73 -
8.2. Output parameters (AC).......................................................................................- 74 -
8.3. Efficiency,Protection and Communication.............................................- 76 -
8.4. General Date.................................................................................................................- 78 -
9. Quality Assurance....................................................................................................................- 80 -

SOFAR 1~4KTL2-G3 User manual
Copyright © Shenzhen SOFARSOLAR Co., Ltd
II
Notice
This manual contains important safety instructions that must be
followed during installation and maintenance of the equipment.
Save these instructions!
This manual must be considered as an integral part of the
equipment. The manual must always accompany the
equipment,even when it is transferred to another user or field.
Copyright Declaration
The copyright of this manual belongs to Shenzhen SOFARSOLAR
Co.,Ltd.Any corporation or individual should not plagiarize, partially
copy or fully copy it (including software, ect .),and no reproduction
or distribution of it in any form or by any means.All right reserved.
SOFARSOLAR reserves the right of final interpretation.This manual
is subject to change according to user’s or customer’s
feedback.Please check our website at http://www.sofarsolar.com
for latest version.
The current Version updated at 20230801.

SOFAR 1~4KTL2-G3 User manual
Copyright © Shenzhen SOFARSOLAR Co., Ltd
III
Preface
Outline
Please read the product manual carefully before installation,
operation or maintenance. This manual contains important safety
instructions and installation instructions that must be followed
during installation and maintenance of the equipment.
Scope
This product manual describes the installation,electrical
connections, commissioning, maintenance and troubleshooting of
SOFAR 1~4KTL2-G3 inverters:
1.1KTL2-G3 1.6KTL2-G3 2.2KTL2-G3
2.7KTL2-G3 3KTL2-G3 3.3KTL2-G3
4KTL2-G3
Keep this manual where it will be accessible at all times.
Target Group
This manual is intended for qualified electrical technical personnel
who are responsible for inverter installation and commissioning in
the PV power system and PV plant operator.
Symbols Used
This manual is provides safety operation information and uses the
symbol in order to ensure personal and property security and
property security and use inverter efficiently when operating the
inverter. You must understand these emphasized information to
avoid the personal injury and property loss.Please read the
following symbols used in this manual carefully.

SOFAR 1~4KTL2-G3 User manual
Copyright © Shenzhen SOFARSOLAR Co., Ltd
IV
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 potential risks which, if not
avoided, may lead to equipment fault or
property damage.
Attention
Note provides tips that are valuable for the
optimal operation of the product.
Note

SOFAR 1~4KTL2-G3 User manual
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1.Basic safety information
If you have any question or problem when you read
the following information, please contact Shenzhen
SOFARSOLAR Co., Ltd.
Note
Outlines of this chapter
Safety instruction
It mainly introduce the safety instruction when install and operate
the equipment.
Symbols and signs
It mainly introduce the safety symbols on the inverter.
1.1.Safety instructions
Read and understand the instructions of this manual, and be
familiar with relevant safety symbols in this chapter, then start to
install and troubleshoot the equipment.
According to the national and state requirements, before
connecting to the electrical grid, you must get permission from the
local electrical grid operation can only be performed by qualified
electrical engineer.
Please contact the nearest authorized service center if any
maintenance or repair is needed.Contact your distributor for the
information of the nearest authorized service center. Do NOT repair
it by yourself, it may cause injury or property damage.
Before installing and maintaining the equipment, you should turn

SOFAR 1~4KTL2-G3 User manual
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the DC switch OFF to cut off the high voltage DC of the PV array.
You can also turn the switch in the PV combiner box OFF to cut off
the high voltage DC. Otherwise, serious injury may be caused.
Qualified persons
The customer must make sure the operator has the necessary skill
and training to do his/her job.Staff in charge of using and
maintaining the equipment must be skilled,aware and mature for
the described tasks and must have the reliability to correctly
interpret what is described in the manual. For safety reason only a
qualified electrician, who has received training and / or has
demonstrated skills and knowledge in construction and in
operation of this unit, can install this inverter. Shenzhen
SOFARSOLAR Co., Ltd does not take any responsibility for the
property destruction and personal injury because of any incorrect
use.
Installation requirements
Please install inverter according to the following section. Fix the
inverter on an appropriate objects with enough load bearing
capacity (such as walls, PV racks etc.), and ensure that inverter is
vertical placed. Choose a place suitable for installing electrical
devices. And assure there is enough fire exit space, convenient for
maintenance. Maintain proper ventilation to ensure enough air
cycle to cool the inverter.

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Transport requirements
If you find packing problems that may cause the damage of the
inverter, or find any visible damage, please immediately notice the
responsible transportation company. You can ask solar equipment
installation contractor or Shenzhen SOFARSOLAR Co.Ltd for help if
necessary.
Transport of the equipment, especially by road, must be carried out
with by suitable ways and means for protecting the components (in
particular, the electronic components) from violent shocks,
humidity, vibration, etc.
Electric connection
Please comply with all the current electrical regulations about
accident prevention in dealing with the solar invert.
Before the electrical connection, make sure to use
opaque material to cover the PV modules or to
disconnect PV array DC switch. Exposure to the sun,
PV array will produce a dangerous voltage!
Danger
All installation accomplished only by professional
electrical engineer!

SOFAR 1~4KTL2-G3 User manual
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Must be trained;
Completely read the manual operation and
understand relevant matter.
Warning
Get permission from the local electrical gird operator,
complete all electrical connections by professional
electrical engineer, then connect inverter to electrical
grid.
Attention
It’s forbidden to remove the tamper evident label, or
open the inverter. Otherwise Sofarsolar will not
provide warranty or maintenance!
Note
Operation
Touching the electrical grid or the terminal of the
equipment may lead to electrocution or fire!
Don’t touch the terminal or conductor connected to
the electrical grid.
Pay attention to any instructions or safety documents
related to grid connection.
Danger
Some internal components will be very hot when
inverter is working. Please wear protective 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 5 minutes at least before carrying out any
maintenance or repair work.
Danger
Inverter should work again after removing any faults. If
you need any repair work, please contact with the local
authorized service center.
Can’t open the internal components of inverter
without authorized. Shenzhen SOFARSOLAR Co., Ltd.
does not take any responsibility for the losses from
Attention

SOFAR 1~4KTL2-G3 User manual
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that.
EMC / noise level of inverter
Electromagnetic compatibility (EMC) refers to that one 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 around the inverter in
less than 20 cm when inverter is working.
Danger
1.2.Symbols and signs
Caution of burn injuries due to hot enclosure!
You can only touch the screen and pressing key of the
inverter while it’s working.
Caution
PV array should be grounded in accordance to the
requirements of the local electrical grid operator!
We suggest that all PV module frames and inverter are
reliably grounded to protect the PV system and
personnel security.
Attentio
n
Ensure input DC voltage < Max. DC voltage .Over voltage
may cause permanent damage to inverter or other
losses, which will not be included in warranty!
Warning
Signs on the inverter
There are some symbols which are related to security on the

SOFAR 1~4KTL2-G3 User manual
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inverter. Please read and understand the content of the symbols,
and then start the installation.
There is a residual voltage in the inverter! Before
opening the
equipment, operator should wait for five minutes to
ensure the capacitor is discharged completely.
Caution, risk of electric shock.
Caution hot surface.
Comply with the Conformite Europeenne (CE)
certification.
Grounding point.
Please read this manual before install SOFAR
1~4KTL-G3.
This indicates the degree of protection of the
equipment according to IEC standard 70-1 (EN 60529
June 1997) .
Positive pole and negative pole of the input voltage
(DC).
RCM (Regulatory Compliance Mark)
The product complies with the requirements of the
applicable Australian standards.

SOFAR 1~4KTL2-G3 User manual
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2.Product characteristics
Outlines of this chapter
Product dimensions
It introduces the field of use, and the overall dimensions of SOFAR
1~4KTL2-G3 inverters.
Function description
It introduces how SOFAR 1~4KTL2-G3 inverters work and the
function modules inside.
Efficiency curves
It introduces the efficiency curves of in the inverter.
2.1.Product dimensions
SOFAR 1~4KTL2-G3 is a single MPPT grid-tied PV inverter which
converts the DC power generated by PV arrays into sine wave
single-phase AC power and feeds it to the public electrical grid, AC
circuit breaker (refer to Section 4.4) and DC switch used as
disconnect device, and the disconnect device shall be easily
accessible.
Figure 2-1 PV Grid-tied System

SOFAR 1~4KTL2-G3 User manual
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SOFAR 1~4KTL2-G3 inverters can only be used with photovoltaic
modules that do not require one of the poles to be grounded. The
operating current during normal operation must not exceed the
limits specified in the technical specifications. Only the
photovoltaic modules can be connected to the input of the inverter
(do not connect batteries or other sources of power supply) .
The choice of optional parts of inverter should be made by a
qualified technician who knows the installation conditions clearly.
SOFAR 1.1KTL2-G3 SOFAR 1.6KTL2-G3 SOFAR 2.2KTL2-G3:
W×H×D=303mm×260.5mm×118mm
SOFAR 2.7KTL2-G3 SOFAR 3KTL2-G3 SOFAR 3.3KTL2-G3:
W×H×D=321mm×260.5mm×131.5mm
SOFAR 4KTL2-G3:
W×H×D=321mm×260.5mm×151.5mm
Figure 2-2 Front view and left view dimensions of SOFAR 2.2KTL2-G3
Figure 2-3 Front view and left view dimensions of SOFAR 3.3KTL2-G3

SOFAR 1~4KTL2-G3 User manual
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Figure 2-4 Bracket dimensions of SOFAR 1~4KTL2-G3
Labels on the equipment
The labels must NOT be hidden with objects and extraneous parts
(rags,boxes,equipment,etc.);they must be cleaned regularly and kept visible
at all times.

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2.2.Function characteristics
DC power generated by PV array is filtered through Input Board
before entering into 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 in abnormal
operation conditions. At the same time, Control Board can trigger
the relay so as to protect the internal components.
Function module
A. Energy management unit
This control can be used to switch the inverter on/off through an
external (remote) control.
B. Feeding reactive power into the grid
The inverter is able to produce reactive power and can therefore
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 dedicated RS485 serial interface.
C. Limiting the active power fed into the grid
The inverter, if enabled can limit the amount of active power fed
into the grid by the inverter to the desired value (Expressed as a

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percentage) .
D. Self power reduction when grid is over frequency
When the grid frequency is higher than the limited value, inverter
will reduce output power which is necessary for the grid stability.
E. Data transmission
The inverter or a group of inverters may be monitored remotely
through an advanced communication system based on RS-485
serial interface, or remotely via the WIFI/GPRS.
F. Software update
Support USB flash drive local upgrade software and WIFI/GPRS
remote upgrade software.
Electrical block diagram
Figure 2-5 Electrical block diagram

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2.3.Efficiency curve

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3.Installation
Outlines of this chapter
This topic describes how to install the SOFAR 1~4KTL2-G3 .
Installation notes
3.1.Installation Process
Figure 3-1 Installation flowchart
Do NOT install the SOFAR 1~4KTL2-G3 on flammable
material.
Do NOT install the SOFAR 1~4KTL2-G3 in an area used to
store Flammable or explosive material.
Danger
The enclosure and heat sink are very hot while the
inverter is working, therefore do NOT install the SOFAR
1~4KTL2-G3 in places where you might touch them
inadvertently.
Caution
Consider the weight of SOFAR 1~4KTL2-G3 when
transporting and moving the inverters.
Choose an appropriate mounting position and surface.
Assign at least two persons to install the inverter.
Attentio
n
Star
Check
before
installation
Prepare
installation
Determine
installation
Moving the
inverter
Install the rear
panel
Install the
inverter
End

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3.2.Checking Before Installation
Checking Outer Packing Materials
Packing materials and components may be damaged during
transportation. Therefore, check the outer packing materials before
installing the inverter. Check the outer packing materials for
damage, such as holes and cracks. If any damage is found, do not
unpack the SOFAR 1~4KTL2-G3 and contact the dealer as soon as
possible. You are advised to remove the packing materials within
24 hours before installing the SOFAR 1~4KTL2-G3 inverter.
Checking Deliverables
After unpacking the inverter, check whether deliverables are intact
and complete. If any damage is found or any component is missing,
contact the dealer.
Table 3-1 shows the components and mechanical parts that should be
delivered.
NO.
Picture
Description
Quantity
1
1-4KTL2-G3
1pcs
2
Rear panel
1pcs
3
PV+ input terminal
1pcs