Soleil SRT 75K User manual

IV438E REV.01 Issued: 2022/11/09 User Manual Soleil SRT/SPX 75K-150K Pag. 1 of 74 +FR
Soleil SRT 75K-125K
Soleil SPX 136K-150K 3ph
String PV Grid-tied Inverter
User Manual

IV438E REV.01 Issued: 2022/11/09 User Manual Soleil SRT/SPX 75K-150K Pag. 2 of 74 +FR
Notice
The purchased products, services and features are stipulated by the contract made between SIEL and the customer.
All or part of the products, services and features described in this document may not be within the purchase scope
or the usage scope. Unless otherwise specification in the contract, all statements, information, and recommendations
in this document are provided “AS IS” without warranties, guarantees or representations of any kind, either express
or implied.
The information in this document is subject to change without notice. Every effort has been made in the preparation
of this document to ensure accuracy of the contents, but all statements, information, and recommendations in this
document do not constitute a warranty of any kind, express or implied.

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Foreword
Summaries
Thank you for choosing the SRT (75K-125K) and SPX (136K-150K) series string PV grid-tied inverter
(hereinafter referred to as inverter).
This document gives a description of the inverter, including appearance, features, working principles,
installation, electrical connection, operation, maintenance, storage, etc.
Please save the manual after reading, in order to consult it in the future.
The figures in this manual are just for reference, for details please see the actual product.
Applicable Models
⚫SRT 75K-125K – SPX 136K-150K
Symbol Conventions
The manual quotes the safety symbols, these symbols used to prompt users to comply with safety
matters during installation, operation and maintenance. Safety symbol meaning as follows.
.
Symbol
Description
Alerts you to a high-risk hazard that will, if not avoided, result in
serious injury or death.
Alerts you to a medium low risk hazard that could, if not avoided,
result in moderate or minor injury.
Alerts you to a low-risk hazard that could, if not avoided, result in
minor injury.
Anti-static prompting.

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Symbol
Description
Be care electric shock prompting.
Provides a tip that may help you solve a problem or save time.
Provides additional information to emphasize or supplement
important points in the main text.

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Contents
1 Safety Description ....................................................................................................................... 8
1.1 Safety Announcements.....................................................................................................................................8
1.1.1 Use Announcements...........................................................................................................................8
1.1.2 PV String Protection.......................................................................................................................10
1.1.3 ESD Protection ...............................................................................................................................10
1.1.4 Grounding Requirements ..............................................................................................................10
1.1.5 Moistureproof Protection ...............................................................................................................11
1.1.6 Warning Mark Setting ....................................................................................................................11
1.1.7 Electrical Connection ..................................................................................................................... 11
1.1.8 Measurement Under Operation....................................................................................................12
1.2 Operator Requirements...........................................................................................................................12
2 Overview....................................................................................................................................... 13
2.1 Product Intro ................................................................................................................................................13
2.1.1 Features..............................................................................................................................................14
2.1.2 Label scheme of interpretation ........................................................................................................14
2.2 Appearance and Structure.........................................................................................................................15
2.2.1 Appearance ........................................................................................................................................15
2.2.2 Operation Panel.................................................................................................................................15
2.2.3 Bottom Layout....................................................................................................................................16
2.2.4 Size......................................................................................................................................................18
2.3 Working Principle ........................................................................................................................................18
2.4 Communication ...........................................................................................................................................18
2.4.1 RS485 Communication.....................................................................................................................19
2.4.2 WIFI/GPRS Communication (Optional) .........................................................................................19
2.4.3 PID Function (Optional) ....................................................................................................................20
2.4.4 PID repair function ............................................................................................................................20
3 Installation ...................................................................................................................................22
3.1 Installation Process ....................................................................................................................................22
3.2 Installation Tools..........................................................................................................................................22

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3.3 Selection of Installation Site ......................................................................................................................24
3.3.1 Installation Environment ...................................................................................................................24
3.3.2 Installation Clearance .......................................................................................................................25
3.3.3 Requirements for Installation Carrier..............................................................................................27
3.3.4 Installation Method ............................................................................................................................27
3.4 Transporting, Unpacking and Checking...................................................................................................28
3.4.1 Transporting .......................................................................................................................................28
3.4.2 Unpacking and Checking .................................................................................................................30
3.5 Inverter Installation .....................................................................................................................................30
3.5.1 Bracket Installation............................................................................................................................30
3.5.2 Wall Mounting ....................................................................................................................................33
3.6 Electrical Connection..................................................................................................................................37
3.6.1 Safety Announcements.....................................................................................................................37
3.6.2 Requirements for Wire......................................................................................................................38
3.6.3 External Grounding Connection ......................................................................................................39
3.6.4 AC Output Wiring...............................................................................................................................41
3.6.5 Internal Grounding Connection .......................................................................................................45
3.6.6 PV String Input Wiring ......................................................................................................................46
3.6.7 WIFI/GPRS Communication Connection (Optional) ....................................................................51
3.6.8 RS485 port Communication Connection .......................................................................................52
3.7 Check the Installation .................................................................................................................................54
4 Startup and Shutdown.............................................................................................................. 55
4.1 Check Before Startup .................................................................................................................................55
4.2 Start Inverter ................................................................................................................................................55
4.3 Shut Down Inverter .....................................................................................................................................56
5 Maintenance and Troubleshooting ....................................................................................... 57
5.1 Maintenance ................................................................................................................................................57
5.1.1 Maintenance Details and Period .....................................................................................................57
5.1.2 Maintenance Guide ...........................................................................................................................58
5.2 Troubleshooting...........................................................................................................................................60

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6 Stop Running, Dismantle, Discard Inverter ........................................................................63
6.1 Stop Running...............................................................................................................................................63
6.2 Dismantle the Inverter ................................................................................................................................63
6.3 Discard the Inverter ....................................................................................................................................64
7 Package, Transportation, Storage......................................................................................... 65
7.1 Package .......................................................................................................................................................65
7.2 Transportation..............................................................................................................................................65
7.3 Storage .........................................................................................................................................................65
8 Technical Specifications.......................................................................................................... 66
9 Quality Assurance ..................................................................................................................... 71
10 Reference Standards .............................................................................................................. 73

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1 Safety Description
This chapter mainly describes the safety announcements. Prior to performing any work on the device,
please read the user manual carefully, follow the operation and installation instructions and observe
all danger, warning and safety information.
1.1 Safety Announcements
This section mainly describes the safety announcements when operation and maintenance. For
details, please refer to safety description in relevant chapters.
Before operation, please read the announcements and operation instructions in this section carefully
to avoid accident.
The promptings in the user manual, such as "Danger", "Warning", "Caution", etc. don't include all
safety announcements. They are just only the supplement of safety announcements when in
operation.
Any device damage caused by violating the general safety operation requirements or safety standards
of design, production, and usage will void SIEL guarantee.
1.1.1 Use Announcements
Don't touch terminals or conductors connected with grid to avoid death risk！

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There is no operational part inside the inverter. Please do not open the enclosure of the inverter by
yourself, or it may result in electric shock. The device damage caused by illegal operation voids the
guarantee.
After the input and output of the inverter have been disconnected, there may still be residual energy
in the storage capacitor, which may cause electric shock. Do not perform the maintenance until all
power sources are switched-off for 30 minutes and check that there is no voltage and current in the
inverter by the detection equipment.
Please do not put fingers or tools into the rotating fans to avoid human injury or device damage.
The surface temperature of the enclosure/cover of the inverter may reach to 75℃. During running,
please don't touch the surface to avoid scald.
No liquid or other objects are allowed to enter the inverter, or it may cause inverter damage.
In case of fire, please use dry power fire extinguisher. Using liquid fire extinguisher may cause
electric shock.

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1.1.2 PV String Protection
When install PV string in daytime, it necessary to cover the PV string by light-proof material, or the
PV string will generate high voltage under sunlight. If touching PV string accidently, it may cause
electric shock or human injury!
Dangerous voltage between the positive and negative of PV string is present!
When installing the device, make sure that the connection between inverter and PV string has been
disconnected completely. Set warning mark in the disconnected position to avoid reconnecting.
1.1.3 ESD Protection
To prevent damaging of sensitive components (such as circuit board) due to human electrostatic
charge, make sure that you wear anti-static wrist strap before touching sensitive components, and that
the other end is well grounded.
1.1.4 Grounding Requirements
High leakage risk! The inverter must be grounded before wiring. The grounding terminal must be
connected to ground, or there will be the risk of electric shock when touching the inverter.
When installing, the inverter must be grounded first.
When dismantling, the grounding wire must be removed at last.
Don't damage the grounding conductor.
The inverter must be connected to protection grounding permanently.
Before operation, check the electrical connection to ensure the inverter is grounded reliably.

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1.1.5 Moistureproof Protection
Moisture invasion may cause inverter damage!
Observe the following items to ensure the inverter works normally.
When the air humidity is more than 95%, don't open the case of the inverter.
In the wet or damp weather, don't open the case of the inverter to maintain or repair.
1.1.6 Warning Mark Setting
In order to avoid accident for unwanted person gets close to the inverter or makes improper
operation, observe the following requirements while installing, maintaining or repairing.
Set warning marks where the switches are OFF to avoid switching them ON improperly.
Set warning signs or safety warning belt in the operation area, which is to avoid human injury on
device damage.
1.1.7 Electrical Connection
Electrical connection must be performed according to the description in the user manual and the
electrical circuit schematic.
The configuration of PV string, grid level, grid frequency, etc. must meet the technical requirements
of inverter.
Grid-tied generation should be allowed by the local power supply department and the related
operation should be performed by professionals.
All electrical connections must meet the related Country and District standards.

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1.1.8 Measurement Under Operation
High voltage is present in the device even when not in operation. Touching device accidently, may
cause electric shock. So, in case some measurements have to be performed under operation,
protection measures have to be taken (such as wear insulated gloves, etc.).
The measuring device must meet the following requirements:
The range and operation requirements of measuring device meets the site requirements.
The connections for measuring device should be correct and standard to avoid arcing.
1.2 Operator Requirements
The operation and wiring for inverter should be performed by qualified person, which is to ensure
that the electrical connection meets the related standards.
The professional technicians must meet the following requirements:
Be trained strictly and understand all safety announcements and master correct operations.
Fully familiar with the structure and working principle of the whole PV grid-tied generation
system.
Know well about the related standards of local Country and District.

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2 Overview
This chapter mainly describes product appearance, structure, working principle and communication
method, etc.
2.1 Product Intro
The inverter converts the DC energy from PV string into AC energy and then feedbacks to power grid,
which makes it suitable for the large power station grid-tied systems. The PV grid-tied generation
system consists of PV string, PV grid-tied inverter, transformer and power distribution system, as
shown Figure2-1.
Figure2-1 PV grid-tied generation system
PV grid-tied power generation needs the permission of local power supply department and be
performed by professionals.
The grid connection configuration supported by the inverter is shown in Figure2-2.
Figure2-2 Grid connection configuration

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2.1.1 Features
⚫1100V DC voltage input, increasing efficiency and cost reduction.
⚫Full voltage adaptation, strong grid support, and adaptability to complex power grid.
⚫The reactive power is adjustable, the range of power factor is -0.8(lag)～+0.8(ahead).
⚫Smart I-V scanning, fault wave capture, remote online update function.
⚫Protection functions: island protection, high/low voltage ride through, reverse DC connection
protection, AC short circuit protection, leakage current protection, surge protection, etc.
⚫Intelligent fan control and fault detection.
⚫Options such as Anti-PID module, GPRS/WIFI remote APP monitoring, and local WIFI+APP
intelligent operation and maintenance, which can flexibly provide customers with a combination
of relevant needs.
⚫The inverter support PLC communication, night SVG function.
⚫Easy maintenance with Bluetooth (SRT 125K model only).
⚫Modular design, enhancing ease of maintenance and repairing.
2.1.2 Label scheme of interpretation
Figure2-3 Label scheme of interpretation
As shown in Figure2-3 "UHK" means that the product is SIEL Soleil SRT/SPX series PV inverter.

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2.2 Appearance and Structure
2.2.1 Appearance
The appearance of SRT/SPX series string PV grid-tied inverter is as shown in Figure2-4.
Figure2-4 Appearance
2.2.2 Operation Panel
There are 4 status indicators on the front panel of the inverter, which can indicate the current working
status of the inverter. The status of each indicator is shown in Table2-1.
Figure2-5 Operation panel
Table2-1 Indicator status illustration
Led
N.
Mark
Color
Meaning
Status illustration
1
Green
PV string indicator
ON: At least a group of PV strings has been
connected.
Flashing: Night SVG mode grid-tied status.
OFF: All PV strings are disconnected.
2
Green
Grid indicator
ON: Grid-tied status.
Flashing: Inverter stay in decrease rated power

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Led
N.
Mark
Color
Meaning
Status illustration
output status.
OFF: No grid-tied status.
3
Green
WIFI/GPRS
indicator
ON: WIFI/ GPRS has been connected.
OFF: WIFI/ GPRS has been disconnected.
4
Red
Fault indicator
ON: The inverter has alarm.
5(*)
Green
Bluetooth
indicator
ON: Bluetooth has been connected with APP.
Flashing: Bluetooth has been disconnected with
APP.
OFF: Bluetooth is in abnormal working status.
(*) SRT 125K model only.
2.2.3 Bottom Layout
The inverter's bottom layout is shown as Figure2-6.
Figure2-6 Bottom layout
SPX136K, SPX150K has 10 MPPT channels with maximum current 30A (6 channels-only optionally,
max. current per MPPT 40A), SRT80K, SRT90K, SRT100K, SRT110K, SRT125K has 9 MPPT
channels with max. current 30A (6 channels-only optional, max. current per MPPT 40A), SRT75K has
9 channels MPPT with max. current 30A (7 channels optional, max. current of per MPPT is 30A).
The above figure takes SRT125K as an example to illustrate. If there is no special explanation, in the
following the SRT125K model will be taken as an example.

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Table2-2 Mark description
NO.
Mark
Name
Remarks
○,1
B+/B-
Energy storage (reserved)
Used to connect battery input.
○,2
DC SWITCH
DC switch
It is the connection switch between
inverter and PV string. Each DC
switch controls the PV string input
terminals of marked area.
○,3
MPPT n+/MPPT n-
PV string input terminal
Used to connect PV string input.
○,4
-
Breather valve
Used to balance the pressure
difference between inside and outside
of the inverter.
○,5
WIFI/GPRS
WIFI/GPRS interface
Used to WIFI/GPRS connection and
communication
○,6
AC OUTPUT
AC output wiring hole
Used to connect the wire of AC
output.
○,7
Internal grounding hole
For internal grounding.
○,8
N
Grounding wiring hole
Used to connect the wire of neutral
wire
○,9
COM1/COM2
Communication wiring hole
Used to connect the wire of RS485 or
DRM
DC Switch
The DC switch (the position is shown as ○,2 in Figure2-6) is the connection switch between the
inverter and the PV string, when necessary, it can safely disconnect the connection of the inverter and
the PV string. In order to ensure the safety of the operator, make sure that the DC switch is turned-off
under the following conditions:
⚫When installing and wiring, the DC switch must be placed to OFF position.

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⚫When checking and repairing, place the DC switch to OFF position and wait for 30 minutes. Use
a multimeter to measure the DC bus voltage inside the inverter. Repairing work can be executed
ONLY when the voltage is lower than 10V.
2.2.4 Size
Figure2-7 Size (unit: mm)
2.3 Working Principle
The PV string input is connected to the inverter, and the maximum power point for the PV string is
tracked through the internal 9 (SRT family ) or 10 MPPT (SPX family) circuits, to achieve the
maximum power output of the PV string, and then the conversion of DC power to three-phase AC
power is realized through the inverter stage, as shown in Figure2-8.
Output
EMI filter
Relays
SPD
CHCT
HCT
HCT
( –)
( + )
( –)
( + )
( –)
( + )
MPPT1 C
( –)
( + )
+
–
DC/DC1
DC/DC9
…
L1
L2
L3
PE
Input
EMI filter
…… ……
SPD
GND
GND
DC switch
L1 L2 L3
MPPT9
DC/AC
Figure2-8 Working principle diagram
2.4 Communication
The inverter has multiple communication methods, including RS485 communication, Bluetooth
communication (SRT 125K model only), WIFI/GPRS communication (optional), and PLC
communication (optional). Users can easily obtain the current operation data of the inverter.

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2.4.1 RS485 Communication
RS485 communication (the interface is shown in Figure2-9) is mainly used for local area network
monitoring, which can realize the background remote monitoring.
Figure2-9 RS485 communication interface position
Figure2-10 RS485 communication (multiple inverters)
When there is only one inverter which communicates via RS485, choose one of the two
communication interfaces to connect.
2.4.2 WIFI/GPRS Communication (Optional)
WIFI/GPRS communication is mainly used for remote monitoring, and the running information of
the inverter can be monitored through APP on mobile phone. WIFI/GPRS interface is shown as
○,4 in Figure2-6.

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Figure2-11 WIFI/GPRS monitoring solution
The APP can build communication between WIFI or GPRS wireless communication module and
inverter. Via APP, the near-end and far-end maintenance and monitor of the inverter can be executed.
User can query the inverter information, alarm, event and set the parameters by the APP.
Download and installation requiring the APP from [email protected].
2.4.3 PID Function (Optional)
If PID function is configured and enabled, during inverter operation the voltage of all PV strings to
ground is kept greater than zero, i.e. the voltage of all PV strings to ground is positive voltage status.
⚫Before enable PID protection or repair function, please pay attention to the polarity requirement
for the voltage of different PV string to ground. If any question, please contact the manufacturer of
PV string or read the user manual of PV string.
⚫When the type of PV string mismatches the voltage scheme of PID protection or repair function,
the PID function will not reach the expected effect and even cause harmful influence on PV strings.
2.4.4 PID repair function
When the inverter is not in operation, the PID function module add reverse voltage to PV strings, in
order to repair the PV strings where the PID effect has occurred.