Sofar 25KTLX-G3 User manual

SOFAR 25...50KTLX-G3

About this manual
1.1 Copyright declaration
1.2 Structure of the manual
1.3 Scope
1.4 Target group
1.5 Symbols used
01
Basic safety information
2.1 Safety information
2.2 Symbols and signs
02
Product features
3.1 Product dimensions
3.2 Power grid types
3.3 Product dimensions
3.4 Labeling on the device
3.5 Functional features
3.6 Eciency curve
03
Installation
4.1 Installation information
4.2 Installation procedure
4.3 Examination before installation
4.4 Tools
4.5 Installation location
4.6 Unpacking the inverter
4.7 Installation of the inverter
04
CONTENTS
01
01
01
01
01
01
08
08
08
09
10
10
11
13
13
13
13
15
16
18
18
03
03
03

Electrical connections
5.1 Safety instructions
5.2 Electrical connection
5.3 Connections
5.4 Connecting the PE cables
5.5 Connecting the DC cables
5.6 5.6Connecting the AC power cables
5.7 Communication port
5.8 Energy meter connection
5.9 System monitoring
05
Commissioning the inverter
6.1 Safety test before commissioning
6.2 Starting the inverter
6.3 Smartphone app SOFAR View
06
Operation of the device
7.1 Control panel and display field
7.2 Standard display
7.3 Status display
7.4 Menu structure
7.5 Software update
07
Troubleshooting handling
8.1 Troubleshooting
8.2 Maintenance
08
20
20
21
21
21
22
24
28
33
34
41
41
41
42
42
44
39
39
39
39
46
46
52
54Technical data
09

1. About this manual
This manual contains important safety information that must be observed during
installation and maintenance of the device.
Carefully read this manual before use and retain it for future reference!
This manual must be treated as an integral component of the device. The manual must
be kept in close proximity to the device, including when it is handed over to another user
or moved to a different location.
1.1 Copyright declaration
• The copyright of this manual is owned by SOFARSOLAR. It may not be copied – neither
partially nor completely – by companies or individuals (including software, etc.) and
must not be reproduced or distributed in any form, or with the appropriate means.
• SOFARSOLAR reserves the right to final interpretation. This manual may be amended
following feedback from users or customers. Please consult our website at http://www.-
sofarsolar.eu for the latest version.
• The current version was updated on 12/14/23.
1.2 Structure of the manual
This manual contains important safety and installation instructions that must be observed
during installation and maintenance of the device.
1.3 Scope
This product manual describes the installation, electrical connection, commissioning, main-
tenance and fault elimination procedures of the SOFAR 25 … 50KTLX-G3 inverters.
1.4 Target group
This manual is intended for specialist electrical engineers who are responsible for the instal-
lation and commissioning of the inverter in the PV system, as well as the PV system opera-
tors.
1.5 Symbols used
25 ... 50KTLX-G3 User Manual
01

Non-observance will result in death or serious injury.
Follow the warnings in order to prevent death or serious injury!
DANGER
Non-observance may result in death or serious injury.
Follow the warnings in order to prevent serious injury!
WARNING
Non-observance may result in minor injury.
Follow the warnings in order to prevent injury!
CAUTION
Non-observance may result in property damage!
Follow the warnings in order to prevent damage to or destruction of the product.
ATTENTION
Provides tips essential to the optimal operation of the product.
NOTE
This manual contains information on safe operation and uses symbols to ensure the safety
of persons and property as well as the ecient operation of the inverter. Please read through
the following symbol explanations carefully in order to prevent injury or property damage.
02
25 ... 50KTLX-G3 User Manual

If you have any questions or problems after reading the following information,
please contact SOFARSOLAR
NOTE
2.Basic Safety Information
This chapter details the safety information pertaining to the installation and operation of
the device.
2.1 Safety information
Read and understand the instructions within this manual and familiarise yourself with the
relevant safety symbols in this chapter before beginning with the installation of the device
and eliminating any faults.
Before connecting to the power grid, you must obtain ocial authorisation from the local
power grid operator in accordance with the corresponding national and state require-
ments. Furthermore, operation may only be carried out by qualified electricians.
Please contact the nearest authorised service centre if any maintenance or repairs are
required. Please contact your dealer to obtain information about your nearest authorised
service centre. Do NOT carry out repairs on the device yourself; this may lead to injury or
property damage.
Before installing the device or carrying out maintenance on it, you must open the DC
switch in order to interrupt the DC voltage of the PV generator. You can also switch off the
DC voltage by opening the DC switch in the Array junction box. Not doing this may result
in serious injury.
2.1.1 Qualified personnel
Personnel tasked with the operation and maintenance of the device must have the
qualifications, competence and experience required to perform the described tasks, while
also being capable of fully understanding all instructions contained within the manual. For
safety reasons, this inverter may only be installed by a qualified electrician who:
• has received training on occupational safety, as well as the installation and commis-
sioning of electrical systems.
• Is familiar with the local laws, standards and regulations of the grid operator.
SOFARSOLAR assumes no responsibility for the destruction of property or any injuries to
personnel caused by improper usage.
2.1.2 Installation requirements
Please install the inverter according to the information contained in the following section.
03
25 ... 50KTLX-G3 User Manual

If you have any questions or problems after reading the following information,
please contact SOFARSOLAR
Dangerous DC voltage
Before establishing the electrical connection, cover the PV modules using opaque
material or disconnect the PV generator from the inverter. Solar radiation will
cause dangerous voltage to be generated by the PV generator!
DANGER
Danger through electric shock!
All installations and electrical connections may only be carried out by trained
electricians!
DANGER
2.1.3 Transport requirements
The factory packaging is specifically designed to prevent transport damage, i.e. violent
shocks, moisture and vibrations. However, the device must not be installed if it is visibly
damaged. In this case, notify the responsible transport company immediately.
2.1.4 Labeling on the device
The labels must NOT be concealed by items and foreign objects (rags, boxes, devices, etc.);
they must be regularly cleaned and kept clearly visible at all times.
2.1.5 Electrical connection
Observe all applicable electrical regulations when working with the Solar inverter.
Mount the inverter to a suitable object with a sucient load-bearing capacity (e.g. walls, PV
frames etc.) and ensure that the inverter is upright. Choose a suitable place for the
installation of electrical devices. Ensure that there is sucient space for an emergency exit
which is suitable for maintenance. Ensure sucient ventilation in order to guarantee an air
circulation for the cooling of the inverter.
04
25 ... 50KTLX-G3 User Manual

Authorisation for grid feed-in
Obtain authorisation from the local power grid operator before connecting the
inverter to the public power grid.
Voiding of guarantee
Do not open the inverter or remove any of the labels. Otherwise, SOFARSOLAR shall
assume no guarantee.
IMPORTANT
NOTE
Electric shock
Contact with the electrical grid or the device’s terminals may result in an electric
shock or fire!
Do not touch the terminal or the conductor which is connected to the electrical grid.
Follow all instructions and observe all safety documents that refer to the grid
connection.
DANGER
Dangerous voltage!
· Before carrying out any repair work, first switch off the AC circuit breaker between
the inverter and power grid, and then the DC switch.
· After switching off the AC circuit breaker and the DC switch, wait a minimum of 5
minutes before starting any maintenance or repair work.
DANGER
Burning due to hot housing
While the inverter is being operated, several internal components will become very
hot.
Please wear protective gloves!
Keep children away from the device!
CAUTION
2.1.7 Repair and maintenance
2.1.6 Operation
05
25 ... 50KTLX-G3 User Manual

Beware of burning hazards due to the hot housing!
· While the inverter is in operation, only touch the display and the buttons, as the
housing can become hot.
CAUTION
Damage due to overvoltage
· Ensure that the input voltage does not exceed the maximum permissible voltage.
Overvoltage may cause long-term damage to the inverter, as well as other damage
that is not covered by the warranty!
WARNING
Implement earthing!
· The PV generator must be earthed in accordance with the requirements of the local
power grid operator!
· For reasons of personal safety, we recommend that all PV module frames and
inverters of the PV system arereliably earthed.
ATTENTION
Unauthorised repairs!
Following the elimination of any faults, the inverter should be fully functional once
more. Should any repairs be required, please contact a local authorised service centre.
The internal components of the inverter must NOT be opened without the
relevant authorisation. Shenzhen SOFARSOLAR Co., Ltd. assumes no responsibility
for any resulting losses or defects.
IMPORTANT
2.2 Symbols and signs
06
25 ... 50KTLX-G3 User Manual

Unauthorised repairs!
Following the elimination of any faults, the inverter should be fully functional once
more. Should any repairs be required, please contact a local authorised service centre.
The internal components of the inverter must NOT be opened without the
relevant authorisation. Shenzhen SOFARSOLAR Co., Ltd. assumes no responsibility
for any resulting losses or defects.
2.2.1 Symbols on the inverter
Several symbols pertaining to safety can be found on the inverter. Please read and under-
stand the content of these symbols before starting the installation.
Symbols Description
5min
Residual voltage is present in the inverter! Before opening the inverter, you
should wait five minutes to ensure that the capacitor has been fully
discharged.
Caution! Danger through electric shock
Caution! Hot surface
The product is compliant with EU guidelines
Earthing point
Please read the manual before installing the inverter
The temperature range in which the inverter can operate
RCM (Regulatory Compliance Mark)
The product meets the requirements of the applicable
Australian standards.
07
25 ... 50KTLX-G3 User Manual
Device degree of protection according to EN 60529
Positive and negative poles of the DC input voltage
The inverter must always be transported and stored with the arrows
pointing upward

· For the TT grid, voltage between N and PE should be less than 30 V.
NOTE
3.Product features
This chapter describes the product features, dimensions and eciency levels.
3.1 Product dimensions
The SOFAR 25 … 50KTLX-G3 is a grid-coupled PV inverter with up to two MPPTs which
converts the direct current generated by PV systems into a three-phase alternating current
and feeds it into the public power grid. The AC circuit breaker and DC switch are used as a
disconnecting device and must be easily accessible.
3.2 Power grid types
The SOFAR 25 … 50KTLX-G3 are compatible with the following grid types:
SOFAR 25 … 50KTLX-G3 inverters may only be used with photovoltaic modules which do
not require one of the poles to be earthed. In normal operation, the operating current
must not exceed the limits specified within the technical data. Only photovoltaic modules
may be connected at the input of the inverter (no batteries or other power sources must
be connected).
Grid
PV Panels Interver
08
25 ... 50KTLX-G3 User Manual

· SOFAR 25…36KTLX-G3 inverters support 6-channel PV string input.
· SOFAR 40…50KTLX-G3 and the HV models support 8-channel PV string input.
NOTE
3.3 Product dimensions
All SOFAR 25 … 50KTLX-G3 have the following dimensions:
L × W × H = 585 mm × 480 mm × 220 mm
480
539
585 231
Front Side Back
bottom view
wall bracket
403
176
126 126
80
4-12
8- 10
36
10
2- 7
09
25 ... 50KTLX-G3 User Manual

3.4 Labeling on the device
Labeling must not be covered or removed!
3.5 Functional features
The DC output generated by the PV generator is filtered by the input board before it
reaches the power board. The input board also provides functions such as the detection of
insulation impedance and the measurement of the DC current and voltage. The DC
current is converted into AC current by the power board. The AC current is filtered by the
output board and fed into the power grid. The output board also provides functions such
as grid voltage and current measurement, earth fault protection and a disconnecting relay.
The control board supplies the auxiliary energy, controls the operating state of the inverter
and displays the operating status on the display board. An error code will appear on the
display if the inverter is in an abnormal operating state. At the same time, the control
board may trigger the relay in order to protect the internal components.
3.5.1 Functions
A. Digital inputs (DRMs)
The inverter can be switched on/off or the grid power can be controlled via the external
control.
B. Feeding of reactive power into the grid
The inverter is capable of generating reactive power and can also feed it into the grid. The
setting of the power factor (Cos Phi) can be controlled via the serial RS485 interface.
C. Limitation of the active power fed into the grid
The inverter can limit the active power fed into the grid to a specific value (as a percentage
of the rated output).
D. Output reduction at overfrequency within the grid
If the grid frequency is higher than the limit value, the inverter will reduce the output
power; this is required to ensure stability of the grid.
10
25 ... 50KTLX-G3 User Manual

E. Data transfer
The inverter (or a group of inverters) can be monitored remotely via the RS485 communica-
tion bus or via WiFi/GPRS.
F. Software update
The device supports local updates via USB stick and remote updates via WiFi/GPRS.
3.5.2 Electrical block diagram
3.6 Eciency curve
94
95
96
97
98
99
100
0% 20% 40% 60% 80% 100%
Efficieny(%)
%of Rated Output Power
Vpv=540v
Vpv=620v
Vpv=850v
Power eciency curve (SOFAR 50KTLX-G3)
11
25 ... 50KTLX-G3 User Manual
L1
L2
L3

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)
Rated power ratio vs. Grid voltage
12
25 ... 50KTLX-G3 User Manual

Weight of the device
· Take into account the weight of the inverter when transporting and moving it.
· Choose a suitable installation location and surface.
· Commission a minimum of two persons with the installation of the inverter.
· Do not set down the inverter upside-down.
IMPORTANT
Fire hazard
· Do NOT install the inverter on flammable material.
· Do NOT install the inverter in an area in which flammable or explosive material is
stored.
DANGER
Burning hazard
· Do NOT install the inverter in places where it can be accidentally touched. The
housing and heat sink may become very hot while the inverter is being operated.
CAUTION
4.Installation
4.1 Installation information
4.2 Installation procedure
4.3 Examination before installation
Mechanical installation is performed as follows:
• Examine the inverter before installation
• Prepare the installation
• Select an installation location
• Transport the inverter
• Mount the rear panel
• Install the inverter
4.3.1Checking the external packaging materials
Packaging materials and components may become damaged during transportation.
13
25 ... 50KTLX-G3 User Manual

Therefore, the external packaging materials must be examined before the inverter is
installed. Check the external packaging material for damage, e.g. holes and cracks. If you
discover any cases of damage, do not unpack the inverter and contact the transport
company and/or dealer immediately. It is recommended that the packaging material
should be removed within 24 hours before installing the inverter.
4.3.2 Checking the delivery scope
After unpacking the inverter, check that the delivery items are both intact and complete.
In the event of any damage or missing components, contact the wholesaler.
Inverter SOFAR
25 … 50KTLX-G3 ×1 Wall bracket ×1
M8*80 Hexagon
screws ×4
PV- metal pin ×6 / 8*
PV- input terminal
×6 / 8*
M5 cross screw ×1
M6 hexagon screw ×1
AC waterproof cover
×1
PV+ metal pin ×6 / 8*
PV+ input terminal
×6 / 8*
M4 cross screw ×6
AC terminal insulation
partition ×4
①
③
⑤
⑦
⑨
⑪
②
④
⑥
⑧
⑩
⑫
14
25 ... 50KTLX-G3 User Manual

COM terminal ×1 WiFi stick logger ×1
R-type terminal
(L1/L2/L3/N) ×4
Warranty card ×1
R-type terminal (PE)
×1
Manual ×1
Outgoing inspection
report ×1
Warranty registration
form ×1
⑬
⑮
⑰
⑲ ⑳
⑭
⑯
⑱
*) second Pcs. for SOFAR 40…50KTLX-G3 + SOFAR 50KTLX-G3-HV
Prepare the tools required for the installation and the electrical connection.
4.4 Tools
①
③
②
④
Model: Hammer Drill Recommend
drill @ 60 mm
Function: Used to drill holes on the
wall
Model: Removal Tool
Function: Used to remove the PV
terminal
Model: M6 Allen key
Function: Used to turn the screw to
connect the rear panel to the inverter
Model: Wire stripper
Function: Used to strip the wire
Model: Crimping tool
Function: Used to crimp power cables
Model: Screwdriver
Function: Used to tighten and loosen
screws when installing the AC power
cable; to remove and install the screws
of the AC terminal
⑤ ⑥
15
25 ... 50KTLX-G3 User Manual

Choose a suitable position for the installation of the inverter. Ensure that the following
requirements have been fulfilled:
⑦
⑨
⑧
⑩
Model: Multimeter
Function: Used to check the earthing
Model: Measuring Tape
Function: Used to measure distances
Model: ESD gloves
Function: for the installer
Model: Spirit level
Function: Used to align the wall
bracket
Model: Safety goggles
Function: for the installer
Model: Anti-dust respiratory mask
Function: for the installer
Model: Hammer
Function: Used to install the expansion
bolts
Model: Socket wrench
Function: Used to install the expansion
bolts
Model: Marker
Function: Used for Marking
⑪ ⑫
⑬ ⑭
⑮
4.5 Installation location
16
25 ... 50KTLX-G3 User Manual

Minimum distances for individual SOFAR 25 … 50KTLX-G3 inverters:
Minimum distances for several SOFAR 25 … 50KTLX-G3 inverters:
50cm
50cm
50cm
80cm
300mm
1000mm
200mm
17
25 ... 50KTLX-G3 User Manual