KStar KSG-1.5K-SM User manual

User Manual
KSG-1.5K/2K/3K/3.6K-SM
Solar Inverter
KSG-1.5K/2K/3K/3.6K-SM
Solar Inverter

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Table of Contents
1 User Guide ......................................................................................2
2 Safety Instructions ..........................................................................3
3 Product Warranty ............................................................................4
4 Overview ........................................................................................5
4.1 Introduction of Grid-connected System ...................................5
4.2 Brief Introduction of PV Inverter.............................................6
4.3 Features Description.................................................................7
5 Installation.......................................................................................8
5.1 Packing ....................................................................................8
5.2 Installation of Inverter..............................................................8
5.3 Installation Location.................................................................9
5.4 Installation Procedure..............................................................10
5.5 Wiring......................................................................................12
5.6 Connection Procedure .............................................................13
6 Operation of Grid-connected Inverter ............................................14
6.1 Trial Operation ........................................................................15
6.2 Working Status ........................................................................15
6.3 LED Display............................................................................17
6.4 LCD Display ...........................................................................18
6.5 Max Power Point Tracking (MPPT) .......................................25
7 Communication Interface................................................................26
7.1 RS232......................................................................................26
7.2 RS485......................................................................................26
7.3 WLAN (optional) ....................................................................28
7.4 Remote control ........................................................................28
8 Trouble Shooting.............................................................................28
9 Specification ...................................................................................30

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1 User Guide
It is appreciating that you purchase KSG single-phase grid-connected
inverter produced by KSTAR. The product is non-transforming type
inverter, features reliable performance and advanced technology. It
converts DC currents from solar arrays into AC currents then fed to
municipal Electrical Grid.
This manual contains important safety and operational instructions
that must be accurately understood and followed before operating the
products.
Please refer to this manual once there is any problem during
installation or operation. Please contact your local distributors or
agent if not recovered by yourselves.
Thank you again for using our products, please read this manual
completely and hope you are satisfied with our products.
Please retain this manual for future reference.

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2 Safety Instructions
1. Electric Shock
The product has alternating current (AC) and direct
current (DC) connections, in order to avoid any electric
shocks during maintenance or before installation, please
make sure the disconnection of these AC or DC ports,
grounded for solar system and inverter.
2. Operation of Inverter
The product can be only operated or maintained by
professionals. The inverter can only be activated under
such situation: the housing or cover in good condition
without any damages, all screws are tightened in right
positions.
Before opening the inverters, it must be disconnected with
solar array and Grid. In order to discharge completely
from storage capacitance, you can’t touch the inverter
within at least 5 minutes after disconnection.
3. Requirement for Grid Connections
These inverters are only used for supply power for
municipal power grid, and don’t try to connect any other
energy resources with this inverter.
4. High Temperature Protection
During normal operation period, some parts (such as
cooling fins and cover) is heating. Sometimes it will reach
60℃. Please don’t touch these parts to avoid scald.

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3 Product Warranty
The warranty period of these inverters is 2 years. If you would like
to extend your warranty period, you can apply for it and keep up
warranty card well. The maintenance is free of charge during warranty
period. The packing material should be original or similar material
when the defective inverter is returned back to factory for repairing.
This product is guaranteed to cover all shortage or damage due to
design, production, or components. But the warranty doesn’t cover
the followings:
Beyond warranty period

No effective warranty card and product’s series number

Damage caused improper delivery

Damage caused improper installation,unauthorized modification,

maintenance, or test, etc.
Damage caused by working in terrible environment which is not

complied with stipulations in this manual
Damage caused not comply with installation and operation range

in relative international standards or regulations
Damage caused by unnatural environment


PV inverter
PV Panel
DC Input
-
+
-
AC Output -
AC Connection
Unit
-
Grid Public Utility ( )
Feeding AC power to Public Utility only
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4 Overview
4.1 Introduction of Grid-connected System
Basically Grid-connected system is comprised of 4 portions: PV array,
PV inverter, AC connection unit and Public Grid connection unit.
Once PV arrays receive sun shines, they will generate DC current
and feed into PV inverter which is configured between DC input and
municipal AC grid. Through converting DC into AC, the solar energy
is transmitted into municipal Electrical Grid.

3. Company Logo
1. LED&Button
8. DC input ports
10. Cooling fins
7. RS232 port
6. Wifi port (option)
4. RJ45 port
5. AC output port
2. LCD display panel
9. DC-Switch (option)
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4.2 Brief Introduction of PV Inverter
The inverter coverts DC current from solar units into AC current,
and feeds to Municipal Electrical Grid. The inverter is designed and
produced as per relative requirement of laws and regulations. The
shape and functions of relative parts is described as follows:
LED and button: 2 LED indicates current working status, 1 button1.
is used to switch current LCD display information.
LCD display panel: display working status and power efficiency2.
etc information.
Company Logo: Name and identification of the company.3.
RJ45 port: 1 optional water proof communication port, for4.
example, work as RS485 communication port by connecting with
Data collection terminal.
AC output ports: The equipment is connected with municipal Grid5.
through these ports. Please refer to “installation” section to make
clear of connection diagram.

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WIFI6. port.(option)
RS232 port: By this interface, user can use computer to7.
communicate with the equipment. There is water proof cover to
protect RS232 connectors.
DC input ports: Inverters above 3KW have 2 pairs of DC ports,8.
each pair of input ports have positive (+) and negative (-)
connector. Please identify the positive and negative position by
refer to “installation” section.
DC-Switch: DC-Switch (option).9.
Cooling fins: used to release the heat generated from inverters.10.
4.3 Features Description
Beautiful shape design, easy installation

Convenient maintenance, easy operation

High transfer efficiency (Max efficiency > 97.5%, European

efficiency > 97%)
High MPPT, Max MPPT>99.5%

High reliability

Rich Man-Machine interface,
 LCD display and LED indicition
Standard RS232 connection and optional RJ45 communication

Outdoor IP65 protective level


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5 Installation
5.1 Packing
Please check carefully before opening the package of the equipment.
It may cause the inverter damage in case the packing material is found
damage, please contact with forwarder for claim. If necessary, Please
feel free to contact us.
5.2 Installation of Inverter
Please read the following installation instruction before you start your
work so as to achieve best effect of the inverter.
In order to keep long life of inverter, the installation site should be1.
always kept dry.
Select suitable location to install the inverter,2. where is not so easy
for pedestrian to touch, but consider easy installation and easy
maintenance as well.
Make sure the inverter should be kept at least 30CM away from3.
other stuff.
Don’t directly expose the inverter under the sun light, high4.
temperature will affect the inverter’s working efficiency. When
the temperature keeps below 40℃, the inverter will be in best
working status, the life of inverter will be maximum.
Keep good ventilation so as to reduce heat accumulation5.
Once installing inverter in living environment, don’t mount it in6.
plastics plate or wooden plate to avoid noise, it is better to mount
it on the wall.
The inverter generates heat during normal working status,7.
don’t install it on a flammable objects or near the place to store
flammable materials. Don’t install it near potential explosion area.

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5.3 Installation Location
The inverter is suitable to be installed on vertical or backwards1.
tilt wall as shown above, the tilt angle should be less 20°.
Don’t install inverter on forward tilt wall.2.
Don’t install inverter on horizontal wall.3.
Mount the inverter at height same as eyesight for easy operation4.
and data reading.

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5.4 Installation Procedure
Stick the installation formwork from the packing list to the1.
wall. Use ∮10 driller kit to drill installation holes with
reference of the following photo for the correct position.
Clean the dust inside the holes, and insert expansion pipe into2.
the holes. And then tighten 4 screws into upper four pipes, After
tightening, gap between the nut and the wall must than 10mm at
least.

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Hang the inverter onto the 4 tapping screws, and check both sides3.
and keep the inverter in right position, then tighten four tapping
screws as shown in following pictures.

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5.5 Wiring
Remove wiring cover in the inverter, you will see below shown
connection ports:
A,B,
C,D
Connector for DC input, the polarity sequence is negative,
negative, positive, positive (-,-,+,+). Please find label with
polarity markers.（1.5K/2K-SM has only one group of
positive pole, negative pole and PV terminal in A,D）.
E RS232 communication interface
FRS485A/B connected with PC via joint RS485 /RS232
G,H,I Connector for AC output, they are L, N and PE lines
J RS485 matched resistance (When two or more inverters
are in parallel communication, 2P DIP switch beside
RJ45 of the last one should be "ON". Or else, it may
cause communication interruption. That 2P DIP switch is
on, means connecting a 120communication terminal
resistance between the R/T + and R/T - )
K DC-Switch (option)
L WIFI port (option)
Attention:
The wire connection can only be done after the inverter is fixed in1.
proper position on the wall.
Make sure the Max. open circuit voltage and short circuit current2.
of solar arrays are not exceeded the stipulated range of the
inverter.
Select the inner diameter of 12AWG (4mm3. 2) and the outer
diameter of 6mm of the photovoltaic cable as the connecting
line of the PV input terminal. Select the inner diameter of 12AWG

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(4mm2) and the outer diameter of 13mm of the photovoltaic
cable as the connecting line of the AC output terminal. Cables
should avoid high temperature, flame and rain water whenever
possible.
During connecting the inverter, make sure no connection among4.
AC, DC and any power resources. They also can not be connected
when any accident occurs.
Identify the polarity of wires and connection ports first, then5.
connect the inverter with solar arrays and municipal Electrical
Grid.
5.6 Connection Procedure
Connection with Municipal Electrical Grid1.
First disconnect with municipal Grid by breaker, make sure it will
not be connected again even due to accident, then move away
wiring cover by loosing 4 screws at front-right side. Pass cable
through wiring cover and connect with L, N, PE ports by flat
screw driver. Finally tighten 4 screws unscrewed before.
Connection with Solar Array2.
In order to guarantee installation and operation of system
safety, external manual breaker has to be configured at DC
side. The selection of breaker should meet basic current and
voltage capacity. Meanwhile, disconnect AC current first before
disconnect DC units.
Before connect the inverter with solar Arrays, test max series
voltage of solar Arrays, whose value should not be over max input
voltage of inverter. Meanwhile the short current of solar Arrays is
better not to exceed max DC current. Please check the polarity of
solar Arrays before the connection.
The positive of solar Arrays should be connected to positive
port in the inverter and the negative of solar Arrays should be
connected to negative port in the inverter.

-SM
-SM
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6 Operation of Grid-connected
Inverter

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6.1 Trial Operation
The inverter can be activated only after the following inspections are
well executed:
Correct connection for AC cables.1.
2. All solar arrays are connected with the inverter correctly.
3. Tighten all screws.
4. Turn on the breaker between DC and AC.
5. The inverter will automatically get started once PV arrays generate
enough voltage.
6.2 Working Status
Working status is divided into 3 kinds: normal working status, faulty
status, and termination status.
1. Normal Working Status
There are two modes: standby status and running status for this stage.
Under this mode, the system is running in normal status. Meanwhile
tracking all functioning data to keep the system running in its best
status.
Once PV array’s voltage is lower than 150V but higher than 120V,
the inverter will be in standby status, at this period the inverter starts
to run and all test functions get ready, but it doesn’t feed power to
municipal Electrical Grid. When PV array’s voltage is higher than
150V, the inverter will transfer to running status after self test, and
meanwhile start to feed energy to municipal Grid.

Turn on the inverter, its model
and version will be displayed
first.
The input voltage is less
150V but higher than 120V,
the inverter will be in stand-
by status.
The input voltage is higher
than 150V, the inverter will
be in self-test status.
After self testing, the
inverter will be in normal
working status (the data
only for reference).
3K-SM
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The following example shows the process when PV voltage is
increased from 120V:
Attention: Before connecting to DC, please make sure
input positive (+) and negative (-) connections are correct,
otherwise the component of inverter will be damaged,
which may cause the inverter in abnormal operation status.

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Fault Status2.
The PV inverter is always under intelligent monitoring condition
after it gets started. It will become faulty status when any fault occurs
(such as municipal voltage is overload, frequency is over range) or
components failure. The faulty information can be displayed by LCD,
at that time the red LED is on.
3. Termination Status
When the output voltage from PV array is lower than a certain
threshold, the inverter will be in termination status. All LCD or LED
light will be off, and no energy from inverter fed to municipal Grid.
Meanwhile no energy consumption for inverter itself, any actions on
the keys (buttons) are invalid.
6.3 LED Display
In the front panel, here are 2 LED displays: RED light and GREEN
light. Under normal working condition, GREEN light keeps on. The
display functions of these 2 LED lights are as follows:
Working (GREEN light): it will be on during normal working status.
But it will be off during night time when no current is from solar
Arrays.

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Error (RED light): it will be on when fault alarm occurs or
components failure. If you like to realize more error information,
please refer to below chapters.
6.4 LCD Display
1. Button and Back Lighting Operation
There are two types of button press,short time press means pressing
the button less than 0.5 second,and long time press means pressing the
button more than 3 seconds.The short time press is used for page up,
moving the cursor,the long time press is used for locking the screen,
selecting item,setting and returning to upper menu.
The LCD back lighting will be turned off 180 seconds after the latest
button press operation. To lighten the LCD back lighting, please press
the button again.
2.Working Mode Display
When the inverter is running in working mode, the short time button
press can change the LCD display.What the LCD will display when
you press the button is showed below.

Normal
SPEC: Italy
Model: XXXX
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If there is long time button press happened when the display stays
in some page,then this page of display will be locked. In the same
way,long time button press can make a page of display switch
between lock and unlock status. The LCD display will return to the
first page “Power & Etotal” automatically if there is no any button
press operation for a long time and the LCD is not in lock status.
“Auto Test Set” display page will only be shown when the inverter is
set to “Italy” mode.