SOLARMG 1.5K User manual

REV.1-Preliminary S.MG-OM:SG 2-6S
Contents

Il
REV.1-Preliminary S.MG-OM:SG 2-6S
Notes:
This user manual is subject to change (specific please in kind prevail) without prior notice.
5 Electrical Connections-------------------------------------------------------------------22
5.1 Connecting Protection Ground (PGND) Cables --------------------------------------------------22
5.2 Connecting AC Output Cables ------------------------------------------------------------------------24
5.3 Connecting the PV Strings -----------------------------------------------------------------------------27
5.4 Connecting Communication Cables------------------------------------------------------------------31
5.5 Power limit(optional)-------------------------------------------------------------------------------------32
5.6 lnstallation Verification-----------------------------------------------------------------------------------35
6 System Operation ------------------------------------------------------------------------ 36
6.1 Powering ON the Inverter-------------------------------------------------------------------------------36
6.2 Powering OFF the lnverter -----------------------------------------------------------------------------36
7 User lnterface ------------------------------------------------------------------------------ 37
7.1 HMI specification definition-----------------------------------------------------------------------------38
7.2 LCDautomatic-page-turningdisplay-----------------------------------------------------------------39
8 Maintenance----------------------------------------------------------------------------------40
8.1 Routine Maintenance-------------------------------------------------------------------------------------40
8.2 lnverter Troubleshooting --------------------------------------------------------------------------------41
8.3 Removing the lnverter -----------------------------------------------------------------------------------43
9 Warranty---------------------------------------------------------------------------------------44
9.1 Quality Terms----------------------------------------------------------------------------------------------44
9.2 Liability Waiver---------------------------------------------------------------------------------------------44
10 Disposal of the lnverter--------------------------------------------------------------- 45
11 Technical Assistance ------------------------------------------------------------------45
Dear User,
Thank you so much for your choosing 1.5K-6K, the latest generation of grid-tied PV Strings
inverter (hereinafter referred to as the inverter) designed and developed by SolarMG.
This user manual introduces the inverter in terms of its installation, electrical connections,
operation, commissioning, maintenance, and troubleshooting.Please read through the manual
carefully before installing and using the inverter, and keep the manual well for future reference.
Application Model
Grid-tied PV string inverter
• 1.5K/2K/3K/3.6K
• 4K/5K/6K
Applicable Personnel
This user manual is intended for photovoltaic (PV) inverter operating personnel and qualified
electrical technicians.
About This Manual
Contents

2
3
REV.1-Preliminary S.MG-OM:SG 2-6S
As soon as receiving the PV inverter, please check if il is damaged
during its transportation. lf yes, please contact your dealer immediately.
.NOTICE
Symbol Conventions
Safety symbols used in this manual, which highlight potential safety risks and important safety
information, are listed as follows:
Symbol
Description
.
DANGER
lndicates an imminently hazardous situation which, if not correctly
followed, will result in serious injury or death.
.
WARNING
lndicates a potentially hazardous situation which, if not correctly
followed, could result in serious injury or death.
.
CAUTION
lndicates a potentially hazardous situation which, if not correctly
followed, could result in moderate or minor injury.
.
NOTICE
lndicates a potentially hazardous situation which, if not correctly
followed, could result in equipment failure, or property damage.
D
NOTE
Calls attention to important information, best practices and tips:
supplement additional safety instructions for your better use of the
PV inverter to reduce the waste of your resource.
[ REFER
Refer to documentation (Remind operators to refer to the
documentation shipped with the inverter).
Safety Precautions
Before using the product, please read these safety precautions in User Manual carefully.
1.1
Personnel Safety
a. The PV inverter must be installed, electronically connected, operated and maintained through
specially trained technician;
b. The qualified technician must be familiar with the safety regulations of electrical system,
working process of PV power generation system, and standards of local power grid;
c. The technician muti read through this User Manual carefully and master il before any operation.
1.2 PV lnverter Protection
a. Do not tamper with any warning signs on the inverter enclosure because these signs contain
important information about safe operation.
b. Do not remove or damage the nameplate on the inverter's enclosure because il contains
important product information.
1.3 lnstallation Safety
a. Ensure there is no electronical connections around ports of the PV inverter before installation;
b. Adequate ventilation must be provided for inverter installation location. Mount the inverter in
vertical direction, and ensure that no object is put on the heat sink affecting the cooling. (For
details, refer lo Chapter 4 lnstallation)
Please read the User Manual carefully before installing the PVinverter;
warranty or liability will be exempted from the company if damage is
caused by installation faults.
. NOTICE

4
5
REV.1-Preliminary S.MG-OM:SG 2-6S
Before installing the inverter, check all electrical ports lo ensure no
damage and no short circuit. Otherwise personal casualty and/or fire
will occur.
DANGER
To avoid any other unforeseeable risk, contact your dealer immediately,
if there is any issue found during operation.
NOTICE
Power OFF all electrical terminals before the inverter maintenance;
strictly comply with the safety precautions in this document when
operating the inverter.
. DANGER
1.4 Electrical Connections
a. Input terminals of the PV inverter apply only to input terminals of PV String; do not connect
any other DC source lo the input terminals.
b. Before connecting PV modules, ensure that is its voltage is within the safe range; when
exposed to any sunlight, PV modules can generate high voltage.
c. All electrical connections must meet the electrical standards of the country or region.
d. Cables used in electrical connections must be well fixed, under good insulation, and with
appropriate specification.
a. For personal safety, maintenance personnel must wear appropriate personal protective
equipment (like insulation gloves and protective shoes) far the inverter maintenance.
b. Place temporary warning signs or erect fences to prevent unauthorized access to the
maintenance site.
c. Follow the procedures of maintenance stipulated in the manual strictly.
d. Check the relevant safety and performance of the inverter; rectify any faults that may
compromise the inverter security performance before restarting the inverter.
1.7 Additional lnformation
1.5
Operating and Commissioning
. DANGER
While the inverter operating, high voltage can lead to an electrical
shock hazard, and even cause personal casualties. Therefore,
operate the PV inverter strictly according to the safety precautions in
the user manual.
WARNING
When the photovoltaic array is exposed to light, il supplies DC
voltage to the PCE.
A. Before getting the permission of electrical power authority in the country/region, the grid-
tied PV inverter cannot start power generation.
b. Follow the procedures of commissioning described in the user manual when commissioning
the PV inverter.
c. Do not touch any other parts ‘surface except the DC switch when the PV inverter is operating;
its partial parts will be extremely hot and can cause burns.
1.6
Maintenance

7
6
REV.1-Preliminary S.MG-OM:SG 2-6S
Overview of the lnverter
This chapter introduces the inverter and describes its functional model, network application,
appearance, dimensions, and working process etc.
2.1 Functional Models Figure 2.2 a low-voltage grid-tied PV power system
2.1.1 Function
This series is a single-phase grid-tied PV string inverter (transformer less) that converts the DC
power generated by PV strings into AC power and feeds the power into power grid.
. WARNING
The inverter is transformerless. Add an isolation transformer before
grounding the positive/ negative terminal of PV modules (like Thin
Film module) for operation.
. WARNING
Do not connect PV modules in parallel lo several PV inverters for
operation.
2.1.2 Model Description
Figure 2.1 shows a model number of the inverter, using 3K as an example.
2.3
Outline and Dimensions
2.3.1 Outline
Figures 2.3 lo 2.7 show the outline of the inverters as follows:
Figure2.3 1.5K-3.6K PV lnverter withSingleMPPT Input (unit: mm)
Figure 2.1 Model number descriptions
2_2 Application
2.2.1
Grid-tied PV Power Systems
The series applies to grid-tied PV power systems for outdoor power stations. Typically, a grid-tied
PV power system consists of PV modules, grid-tied inverters, AC distribution units, and low-voltage
power grid, as shown in Figure 2.2.
Figure2.4 4K-6KPV lnverter with Dual MPPT Input (unit: mm)
3K
Power class code

8
9
REV.1-Preliminary S.MG-OM:SG 2-6S
2.4 Working Process
2.4.1 Basic principle Description
Figure 2.5 The front view and amplification effect of LED indicator area
Figure 2.6 The rear view of this series of inverter
The 4K-6K PV lnverter with Dual MPPT Input receives input from two strings of PV panel
(1.5K-3.6K PV lnverter with Single MPPT Input receives input from only one string of PV
panel). Then the inputs are grouped into two independent MPPT routes inside the inverter to
track the maximum power point of the PV panel. The two MPPT power is then converted into
DC Bus, then the DC power is converted to AC power through an inverter circuit. Finally the
AC power is fed to the Power grid. EMI filer is used on both the DC and AC sides to
reduce the electromagnetic inference; Surge protection is supported on AC side.
2.4.2 Circuit Diagrams
Figure 2.8 shows the circuit diagram for the 1.5K-3.6K PV lnverter with Single MPPT Input:
Figure 2.8 circuit diagram
Figure 2.9 shows the circuit diagram for the 4K-6K lnverter with Dual MPPT Input:
Figure 2.9 circuit diagram
Figure 2.7 The bottom view of this series of inverter

10
11
REV.1-Preliminary S.MG-OM:SG 2-6S
2.5
Working Modes
Three working modes of the inverter are shown as follows: standby, operating, and shutdown.
Table 2.1 shows the conditions for the inverter to switch between working modes.
Modes
Description
Standby
The PV inverter enters the standby mode when
>the input voltage of PV Strings can enable auxiliary power supply torun,
but cannot meet the inverter operation requirements.
>the input voltage of PV Strings can meet the inverter lo-start requirements,
but cannot meet its minimum power requirements.
Operating
When the PV inverter is grid-tied and generates electricity, it
> tracks the maximum power point to maximize the PV String output.
> converts DC power from PV strings into AC power and feeds the power
to the power grid.
The PV inverter will enter to the shutdown mode if detecting a fault or a
shutdown command.
Shutdown
The PV inverter switches from standby or operating mode to shutdown
mode if detecting a fault or a shutdown command.
The inverter switches from shutdown mode to standby mode if receiving
a Startup command or detecting that a fault is rectified.
Table 2.1 Working modes description
Storage
This chapter describes the storage requirements for the inverter.
The following storage instructions apply if the PV inverter will not be deployed immediately:
> Do not unpack the inverter (put desiccant in the original box if the PV inverter is unpacked).
>Stare the PV inverter at a temperature range of -25°C to +60°C and with the relative humidity
of 0% to 100% (no condensing).
>The PV inverter should be stored in a clean and dry place and be protected from dust and
water vapor corrosion.
> 2K-3.6K PV lnverter with Single MPPT Input a maximum of eight layers of inverters can be
stacked, 4K-6K PV lnverter with Dual MPPT Input a maximum of six layers of inverters
can be stacked.
> Do not position the inverter at a front tilt, excessive back tilt, or side tilt, or upside down.
>Conduct periodic inspection during storage. Replace the packing materials immediately if any
rodent bites are found.
>Ensure that qualified personnel inspect and test the inverter before use if it has been stored
for a long time.
NOTICE
instructions: if the equipment is used in a manner not specified
by the manufacturer, the protection provided by the equipment may
be impaired.

12
REV.1-Preliminary S.MG-OM:SG 2-6S
or
G
H
4.1 Checking the Outer Packing
a. When receiving the inverter, check that the packing materials are intact.
b. After unpacking, check that the deliverables are complete, intact, and consistent with your
order list.
c. Examine the PV inverter and its fittings for damage such as scraps and cracks.
Figures 4.1 The deliverables: The inverter and its fittings
Installation
DANGER
Do not install the inverter on flammable building materials or in an
area where flammable or explosive materials are stored.
CAUTION
Do not install the inverter in a place where personnel are likely to
come into contact with its enclosure and heat sinks to avoid electrical
shock/burn.
Items
Deliverables
A
The inverter
B
Rear panel
C
AC output connector
D
File package
E
DC terminal connector group
F
Screws
G
Removal tool for DC connector
H
Expansion screw group

14
15
REV.1-Preliminary S.MG-OM:SG 2-6S
4.3.2 Compliance and Safety Symbols
Safety symbol
Description
Electrical shock!
There are residual voltages in the PV inverter. lt needs 5minutes
to finish discharge.
The PV inverter must not be touched when in operation. lts
enclosure and heat sinks are extremely hot.
Electrical shock! This part is charged. Only qualified and/or trained
electrical technicians are allowed to perform operations on the inverter.
lf the inverter service life has expired, dispose itinaccordance with
local rules for disposal of electrical equipment waste. Do not dispose
the PV inverter with household garbage.
The PV inverter is compliant with TUV.
4.4 lnstallation Requirements
Applies towall-installation, asdescribed below in detail.
b. The inverter must beinstalled in a well ventilated environment to ensure goodheat dissipation.
c. The inverter must be freefrom direct exposure to sunlight, rain, and snow toextend itsservice
life. lt is recommended that the inverter be installed in a sheltered place. lf no shelter is
available, build an awning, as shown in Figure 4.3.
Figure 4.3 lnstallation environment with awning (unit: mm)
• Carrier Requirements
a. The carrier where the inverter is installed must be fire-proof. Do not install the inverter on
flammable building materials.
b. The wall must be solid enough to bear the weight of the inverter.
c. Do not install the inverter on a wall made of gypsum boards or similar materials with weak
4.4.1 Determining the lnstallation Position sound insulation to avoid noise disturbance in a residential area.
• Basic Requirements
a. The inverter is protected to IP65 and can be installed indoors or outdoors.
b. The installation method and position must be appropriate for the weight and dimensions of
the inverter.
c. Do not install the inverter in a place where personnel are likely to come into contact with its
enclosure and heat sinks because these parts are extremely hot during operation.
d. Do not install the inverter in an area that stores flammable or explosive materials.
• lnstallation Space Requirements
a. lt is recommended that the inverter be installed at eye level to facilitate operation and
maintenance.
b. Reserve enough clearance around the inverter to ensure sufficient space for installation
and heat dissipation, as shown in Figure 4.4.
• lnstallation Environment Requirements
a. The ambient temperature must be below 50°C to ensure the inverter's optimal operation
and extend its service life.

16
17
REV.1-Preliminary S.MG-OM:SG 2-6S
Figure 4.4 lnstallation Space Requirements (unit: mm)
c. When installing multiple inverter, install them along the same line (as shown in Figure 4.5) if
sufficient space is available, and install them in triangle mode (as shown in Figure 4.6) or in
stacked mode (as shown in Figure 4.7) if no sufficient space is available. The installation
modes ensure sufficient space for installation and heat dissipation.
Figure 4.6 lnstallation in triangle mode (unit: mm)
Figure 4.5 lnstallation along the same line (unit: mm)
Figure 4.7 lnstallation in stacked mode (unit: mm)
. NOTICE
The clearance between multiple inverters must be increased to
ensure proper heat dissipation when they are installed in a hot area.

19
REV.1-Preliminary S.MG-OM:SG 2-6S
The recommended 4-6K inverter rear panel mounting combination
is hole 1, 4 or 2, 3.
level
Beforedrillingtheholeon the wall,ensurenodamageon the
electric wire and/or water pipe inside the wall.
4.5 Installing a Rear Panel
Before installing the inverter, secure the rear panel to a wall.
Step 1 Move out the rear panel from the packing case.
Step 2 Determine the positions for drilling holes (as shown in Figure 4.10) using the rear
panel.
Figure 4.10 Determine the positions for drilling holes（unit：mm)
Step 3 Level the hole positions using a level gauge, and mark the hole positions using a marker
(as shown in Figure 4.11).
Figure 4.11 mark the hole positions using a marker
Step 4 Drill holes using a hammer drill and install expansion bolts, as shown in Figure 4.12.
DANGER
mm
0 mm
350mm
296mm
160mm
69mm
6 mm
41mm
8
191mm
156mm
31mm
31mm
12
105mm
3 4
278mm
K~3.6K PV Inverter Dimensions for
Single MPPT Route Input(unit:mm)
4K~6K PV Inverter Dimensions for
Dual MPPT Routes Input(unit:mm)
NOTICE

20
21
REV.1-Preliminary S.MG-OM:SG 2-6S
a, Drill a hole in a marked position to a depth of 60 mm using a hammer drill with a diameter
of 10mm bit
b, Partially tighten an expansion bolt, vertically insert il into the hole, and knock the expansion
bolt completely into the hole using a rubber mallet.
Figure 4.12 Punch holes and install expansion (unit: mm)
Step 5 Align the rear panel with the holes, insert expansion bolts into the holes through the
real panel, and tighten the expansion bolts to a torque wrench (torque 2-2.5 N·m),as shown in
Figure 4.13.
Figure 4.13 lnstalling the rear panel
4.6 lnstalling the inverter
Follow below procedures:
Step 1 Hold the handles at both sides of the inverter and then lift and stand the inverter.
Step 2 Mount theinverter on the rear panel and keep them aligned with each other, as shown
in Figure 4.14.
Step 3 Tighten the twohexagon screws at the both sides of the inverter to a torque of 1.2N.m
and 3N·m respectively. Screw specs for 1.5K-3.6K and 4K-6K are M4 and M6 respectively,
as shown in Figure 4.14.
Figure 4.14 Securing the inverter

22
23
REV.1-Preliminary S.MG-OM:SG 2-6S
ectrical Connections
•
OT 6-4
Key parameter
Product series code
Terminalproduct series code
Good grounding for the inverter helps resist the impact of surge
voltage and improve the EMI performance. Connect the PGND cable
before connecting the AC power cables, DC power cables, and
communication cables.
DNOTE
El
5.1.2 Wiring Procedures
. DANGER
Before performing any electrical connections, ensure that both DC
and AC Switches are OFF. Otherwise, fatai injury can occur due to
the high voltage caused from AC and DC cables.
5.1 Connecting Protection Ground (PGND) Cables
5.1.1
Preparation
The ground cable and OT terminals have been prepared.
a. Ground cable: Outdoor copper-core cables with a cross sectional area of 4 mm' or more are
recommended.
b. OT terminal: OT6~4.
Step 1 Remove an appropriate length of the insulation layer from the PGND cable using a wire
Stripper; the length is a little bit longer than that of OT terminal's crimping end by 2mm~3mm,
as shown in Figure 5.1.
Figure 5.1 Stripped length (unit: mm)
Step 2 lnsert the exposed core wires into the crimping areas of the OT terminal and crimp them
using hydraulic pliers, as shown in Figure 5.2.
Figure 5.2 Crimping a cable (unit: mm)
Step 3 Remove the ground screws from the ground points, as shown in Figure 5.3.
Figure 5.3 Remove the ground screws
lt is recommended that the ground cable be connected to a nearby
ground position. Fora system with multiple inverters connected in
parallel, connect the ground points of all inverters to ensure
equipotential connections.
NOTE

24
25
REV.1-Preliminary S.MG-OM:SG 2-6S
Step 4 Secure the PGND cable (done by step 1 & 2) using the ground screw and tighten the
screw using a socket wrench (torque 1.2 N·m),as shown in Figure 5.4.
WARNING
An independent circuit breaker must be installedon theAC side of each
inverter to ensure that the inverter can be safely disconnected from the
power grid.
WARNING
Do not connect loads between theAC output terminals of the inverter
and circuit breaker.
5.2.2 Procedure of Connecting AC Cables
Figure 5.4 Secure the PGND cable
5.2 Connecting AC Output Cables
5.2.1 Preparation
TheAC power cable and AC terminals have been prepared.
a. AC power cable: Outdoor copper-core cables are recommended. Table 5.1 describes the
Step 1 It is recommended to use outdoor dedicated cables with multiple copper cores.
Remove an appropriate length of the jacket and insulation layer from the AC output cable
using a wire stripper.
specifications.
Step 2
Lead the AC cable through the rubber nut, seal and so on. .
Step 3 Tighten three screws and ensure each screw cap does not exceed the surface, then install
AC connector as shown figure3 below.
Step 4 Plug the AC connector into the inverter.
Table 5.1
b. The recommended specifications of circuit breaker are shown in the table below.
Inverter Model
RecommendedValue
1.5K
10A
2K
16A
3K-3.6K
25A
4K-5K
32A
6K
40A
T
NOTE
There are four types of AC terminals in use (choose one from four).
Please refer to the real object in the deliverables.
optional
optional
optional
Inverter Model
Cable type
Cross-sectional Area(mm2
Cable Outer Diametermm
Range
RecommendedValue
Range
RecommendedValue
1.5K-3.6K
outdoor cable
4~6
4
10~14
14
4K-6K
outdoor cable
6

26
REV.1-Preliminary S.MG-OM:SG 2-6S
Step 5 After the AC terminal is connected, Install as shown below.
Ground, neutral, and line wires must correspond to G, N, and L terminals
of AC connectors respectively. Otherwise, the faulty connection will lead
to the inverter performance failure.
NOTICE

28
29
REV.1-Preliminary S.MG-OM:SG 2-6S
PV Strings DC input cable and connectors have been prepared; Table 5.2 lists the recommended
outdoor copper-core DC input cable specifications.
lnverter model
Cable Type
Cross-sectionaI Area(mm
2)
Cable Outer Diameter(mm)
RangeRecommended Value
Range
1.5K-3.6K
Common PV cables in
the industry (model:PV1-F)
4- 6
4
5-8
4K-6K
Table 5.3 Recommended DC input cable recommended specifications
Connectors of PV Strings: Positive and negative DC input connectors are used, as shown
in Figure 5.8 and Figure 5.9.
Procedures of connecting the PV Strings
Step 1 Remove an appropriate length of the insulation layer from the positive and negative
power cables using a wire stripper, as shown in below Figure.
Figure 5.1O Removing insulation layer far DC cable (unit: mm)
Step 2 lnsert the exposed areas of the positive and negative power cables into the metal
terminals of the positive and negative connectors respectively and crimp them using a crimping
tool, as shown in Figure 5.11.
Figure 5.8 Positive connector compositions
Figure 5.9 Negative connector compositions
Figure 5.11 Crimping a metal connector
Step 3 lnsert the crimped positive and negative power cables into the corresponding positive
and negative connectors until a "click" sound is heard, as shown in Figure 5.12.
Figure 5.12 Connecting positive andnegative connectors
Positive and negative metal connectors are packed with positive and
negative connectors respectively when shipped out. After unpacking,
keep the positive and negative ones separate to avoid confusion.
NOTE

31
30
REV.1-Preliminary S.MG-OM:SG 2-6S
Step 4 Tighten the locking nuts on the positive and negative connectors using a removal
wrench, as shown in Figure 5.13.
Figure 5.13 Locking connectors
Step 5 Measure the voltage of every route Strings using a multimeter. Ensure that the polarities
of the DC input power cables are correct, as shown in Figure 5.14.
Figure5.14 Checking the voltage ofevery route Strings
Step 6 lnsert the positive and negative connectors into their corresponding terminals of the
inverter until a "click" sound is heard, as shown in Figure 5.15.
Figure 5.15 Connecting to the inverter
Step 7 After connecting the PV strings, ensure that all connectors are in position by checking
far resistance when a slight pull is applied.
5.4 Connecting Communication Cables
5.4.1 Communication Mode Description
You can use the following communication modes to implement communication:
Bluetooth, WIFI, GPRS and RS485 all of which are described as follows.
• Bluetooth Module
You can turn on the Bluetooth function of the mobile phone, and set parameters and monitor
data of the inverter through the mobile APP.
For details about operation, refer to APP User Manual.
• WIFI & GPRS & RS485 Modules
Following figure show inverter's interface to connect WIFI, GPRS and RS485 accessory, please
refer user manual of accessory far connecting method and its setting.
Module
Function description
WIFI
WIFI module implements communication with Cloud server through
wireless network to monitor PV inverter's data status.
Far more details, refer to WIFI Product Application Manual.
GPRS
GPRS module communicates with Cloud server through a mobile
phone to monitor PV inverter's data status.
Far more details, refer to GPRS Product Application Manual.
RS485
RS485 switching module monitors PV inverter's data status through
collecting and uploading data to Cloud server.
Far more details, refer to RS485 switching Product Application Manual.
NOTE
You can choose and buy WIFI/GPRS/RS485 communication
modules from the company.
The baud rate supported by RS485: 9600BPS
Table 5.4 WIFI & GPRS & RS485 Modules Description

32
33
REV.1-Preliminary S.MG-OM:SG 2-6S
Power limit function
Disable
Power limit function
Power limit mode
Meter on Grid
Power limit mode
OnGrid
Power limit CT ratio
1000:1
Power limit CT ratio
1000:1
Maximum feed in grid power(W)
o
Digital Power Meter Type
Unknown
Maximum feed in grid power(W)
o
Digital Power Meter Type
Unknown
CT sensor
5.5
Power limit (optional) 5.5.2 Wiring diagram of lnverter+Meter
5.5.1 Wiring diagram of lnverter+CT
Figure 5.16 Wiring diagram of lnverter+CT Figure 5.18 Wiring diagram of lnverter+Meter
Figure 5.17 Settings via APP
- Power limit function set to "CT sensor"
- Set the CT position base on the meter installed on load or on grid
- Set maximum feed-in grid power if needed
- Set Power limitCT ratio
Figure 5.19 Settings via APP
Power limit function
Disable
Power limit function
Power limit mode
Meter on Grid
Power limit mode
OnGrid
Power limit CT ratio
1000:1
Power limit CT ratio
1000:1
Maximum feed in grid power(W)
o
Maximum feed in grid power(W)
o
Digital Power Meter Type
Unknown
Digital Power Meter Type
DDSU666
Digital Power Meter

34
35
REV.1-Preliminary S.MG-OM:SG 2-6S
- Set the "Power limit function" to "Digital Power Meter"
- Set the Digital Power Meter Type
- Set the meter position base on the meter installed on load or on grid
- Set maximum feed-in grid power if needed
- Set "Power limit CT ratio" only when using inverter+CT
When "Power limit function" is set to "Digital Power Meter", the RS485 of inverter will change
to a Host that will communicate with digital meter using Modbus-RTU protocol (9600 BPS, 8
data bit, 1 stop bit, no parity data formal) through communication address 1. Please make sure
that the meter is set to Modbus-RTU, 9600, 8-N-1 with address 1. For details of digital meter
setting operation, please refer to the meter user manual.
5.6 lnstallation Verification
Check the following items after the inverter is installed according to Table 5.4.
1. No other objects are put on the PV inverter.
2. AII screws, especially the screws used for electrical connections, are tightened
3. The PV inverter is installed correctly and securely.
4. Ground, AC, DC, and Communications cables are connected tightly/correctly and securely.
5. Check and ensure there is no open circuit or short-circuits at AC and DC terminals using
multimeter.
6. Waterproof connectors al AC terminals and RS485 ports are plugged with waterproof
plugs tightly.
7. Covers at AC terminals are tightened.
8.ldle terminals are sealed.
9. AII safety warning symbols are intact and complete on the inverter.
Table 5.5 Self-check items alter installation

36
37
REV.1-Preliminary S.MG-OM:SG 2-6S
ser Interface
•
System Operation U
6.1
Powering ON the lnverter
Step 1: Switch ON the AC circuit breaker.
Step 2: lf the inverter has a switch, turn the switch to "ON" state.
Step 3: Observe statuses of LED indicator lights on the inverter according to Table 7.1.
Display screen of inverter is composed of LED indicator ( LCD is optional for some models).
LED contains three color states, blue, green and red respectively. For more details, refer to
Table 7.1 HMI specification definition.
6.2 Powering OFF the lnverter
Step 1: Run a shutdown command on the mobile APP.
Step 2: Switch off the circuit breaker at AC terminal.
Step3: lfthe inverter has a switch, turn the switch to "OFF" toobserve.
. WARNING
After the inverter is power off, the remaining electricity and heat
may still cause electrical shock and body burns. Maintenance of
the inverter shall begin ten minutes after the power-off.
□ NOTE
When LED status lights display the inverter has entered
grid-connecting, it means the inverter is operating well. Any query
during operating the PV inverter, contact your dealer.
NOTE
You can view & set data of the inverter through inverter APP.
For details about operation, refer to APP User Manual.
APP User Manual is available for free from website.