KStar KSG Series User manual

202106 Ver:1.0
Shenzhen Kstar New Energy Company Limited
Add:Kstar Industrial Park, Guangming Hi-Tech Park,
shenzhen ,P.R.CHINA.
Tel:[phone] Fax:[phone]
Web:www.kstar.com
Grid-Connected Inverter
KSG series
25KT/30KT/33KT/36KT/40KT

Contents

02 03
The new generation of household three-phase series photovoltaic grid connected
inverter converts the sun into electric energy through the inverter device, which is used
by the power users. It adopts a new design and integrates various functional devices to
adapt to various complex installation environments.
1
3
PV1, PV2 COM2(CT)
2
WLAN GPRS
DVC C DVC A
DVC A 4AC DVC A
User Manual User Manual
1.1 Product Description
Introduction
01
Description Description
Object Object
DVC class DVC class
Contents
LCD display
4 buttons
LED light
▲ Figure 1 Bottom side view
WLAN GPRS
OFF
ON
PV1+ PV1-
PV2+ PV2-PV3+ PV3-
WLAN
GPRS
COM1 COM2
L1 L2 L3 NPE
DC INPUT AC OUTPUT
Contents
54
55

1.2 Unpacking Inspection
Protective cover
for AC terminal
Before opening the inverter package, please check whether the outer package is
damaged. After opening the package, please check whether the inverter appearance
is damaged or lack of accessories. The placement of accessories is as follows:
1.3 Packaging
123 4
5 6 7 8
202011 Ver:1 .0
11
21
36
44
51
61
76
83/3
Protective cover for AC terminal
25K
25-40K6
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When you receive the inverter, ensure that all the parts listed below are included:
Part # Description Number
PV grid tie inverter
Wall/pole bracket
Locking screws
PV connection terminal (+,-)
Manual
OT terminal
Model
1.4 Optional Packaging
WiFi/GPRS Stick
31
1xCT and com cable
41
Part # Description Number
1DRM connector 1
21
Meter 485 connector
WiFi/GPRS Stick
(Optional)
PV grid tie inverter
Wall/pole bracket
Packaging
04 05
Self tapping screw and expansion pipe

Proper storage is required if the inverter is not installed immediately.
• Store the inverter in the original packing case.
• The storage temperature must be always between -40° C and +70° C, and the storage
relative humidity must be always between 0 and 95%, non-condensing.
• In case of stacking storage, the number of stacking layers should never exceed the
limit marked on the outer side of the packing case.
1.5 Inverter Storage
• The packing case should be upright.
• If the inverter has been stored more than half a year, the qualified personnel should
thoroughly check and test it before using.
L*W*H=1120*825*452mm
Model:
X
Grid-Connected Inverter
Safety Instructions
02
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2.2 General Safety Instructions
2.1 Safety Symbols
WARNING:
WARNING symbol indicates important safety instructions, which if not correctly
followed, could result in serious injury or death.
NOTE:
NOTE symbol indicates important safety instructions, which if not correctly
followed, could result in some damage or the destruction of the inverter.
CAUTION:
CAUTION, RISK OF ELECTRIC SHOCK symbol indicates important safety
instructions, which if not correctly followed, could result in electric shock.
CAUTION:
CAUTION, HOT SURFACE symbol indicates safety instructions, which if not
correctly followed, could result in burns.
WARNING:
Only devices in compliance with SELV (EN 69050) may be connected to the
RS485 and USB interfaces.
WARNING:
Please don't connect PV array positive(+) or negative(-) to ground, it could
cause serious damage to the inverter.
WARNING:
Electrical installations must be done in accordance with the local and national
electrical safety standards.
WARNING:
Do not touch any inner live parts until 5 minutes after disconnection from the
utility grid and the PV input.
5min
Improper use may result in potential electric shock hazards or burns. This manual contains
important instructions that should be followed during installation and maintenance. Please
read these instructions carefully before use and keep them for future reference.
Safety symbols used in this manual, which highlight potential safety risks and
important safety information, are listed as follows:
Contact the nearest hazardous waste disposal station when the products or components
are discarded.

ON
Fault: A fault occurs and the device is not generating.
twinkle
Generating: The device is generating the power.
Alarm: the inverter has an alarm signal.
▲Table 3.1 status indicator
Checking: The device is checking.
ON
Generating: flashing indicates that the inverter is being
connected to the power grid.
WARNING:
To reduce the risk of fire, over-current protective devices (OCPD) are required for
circuits connected to the Inverter.
The DC OCPD shall be installed per local requirements. All photovoltaic source and
output circuit conductors shall have disconnects that comply with the NEC Article 690,
Part II.
CAUTION:
Risk of electric shock. Do not remove cover. There is no user serviceable parts inside.
Refer servicing to qualified and accredited service technicians.
CAUTION:
The PV array (Solar panels) supplies a DC voltage when they are exposed to sunlight.
CAUTION:
Risk of electric shock from energy stored in capacitors of the Inverter. Do not remove
cover for 5 minutes after disconnecting all power sources(service technician only).
Warranty may be voided if the cover is removed without unauthorized.
CAUTION:
The surface temperature of the inverter can reach up to 75°C (167 F).
To avoid risk of burns, do not touch the surface of the inverter while ifs operating.
Inverter must be installed out of the reach of children.
PV module used with inverter must have an IEC 61730 Class A rating.
1.Permanent installation is required.
2.The electrical installation must meet all the applicable regulations and standards.
3.The inverter must be installed according to the instructions stated in this manual.
4.The inverter must be installed according to the correct technical specifications.
2.3 Notice For Use
The inverter has been constructed according to the applicable safety and technical guidelines.
Use the inverter in installations that meet the following specifications ONLY:
5.To startup the inverter, the Grid Supply Main Switch (AC) must be switched on, before the
solar panel's DC isolator shall be switched on. To stop the inverter, the Grid Supply Main
Switch (AC) must be switched off before the solar panel's DC isolator shall be switched off.
If the equipment is used in a manner not specified by the manufacturer, the protection
provided by the equipment may be impaired.
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3.1 Front Panel Display
Over view
03
LCD display is Optional.
▲Figure 3.1 Front Panel Display
3.2 LED Status Indicator Light
The LED status indicator can display red and green. When the indicator light is on, it
indicates that there is power. When the indicator light is red, it indicates the alarm
state; when the indicator light is green, it indicates the operation state.
Light Status Description
twinkle
08 09
ON

3.3 Keypad (Optional)
There are four keys in the front panel of the Inverter from left to right: ESC,UP, DOWN and
ENTER keys. The keypad is used for:
• Scrolling through the displayed options (the UP and DOWN keys);
• Access to modify the adjustable settings (the ESC and ENTER keys).
3.4 LCD
The four-line Liquid Crystal Display (LCD) is located on the front panel of the Inverter,
which shows the following information:
• Inverter operation status and data;
• Service messages for operator;
• Alarm messages and fault indications.
You can also get information via WiFi / GPRS.
4.1 Select a Location for the Inverter
▲ Figure4.1 Recommended Installation locations
Installation
04
To selects location for the inverter, the following criteria should be considered:
• Do not install in small closed spaces where air can not circulate freely. To avoid
overheating, always make sure the flow of air around the inverter is not blocked.
• Exposure to direct sunlight will increase the operational temperature of the inverter and
may cause output power limiting. Kstar recommends inverter installed to avoid direct
sunlight or raining.
• To avoid overheating ambient air temperature must be considered when choosing the
inverter installation location. Kstar recommends using a sun shade minimizing direct
sunlight when the ambient air temperature around the unit exceeds 104°F/40°C.
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500mm 500mm 500mm
500mm
500mm
800mm
800mm
▲ Figure 4.4 Inverter wall mounting
220
70
• Install on a wall or strong structure capable of bearing the weight.
• When 1 or more inverters are installed in one location, a minimum 300mm clearance should
be kept between each inverter or other object (if a canopy is added, a distance of 500mm
must also be kept). The bottom of the inverter should be 500mm clearance to the ground.
▲ Figure 4.2 Inverter Mounting clearance
• Visibility of the LED status indicator lights and the LCD located at the front panel of the inverter
should be considered.
• Adequate ventilation must be provided if the inverter is to be installed in a confined space.
4.2 Mounting the Inverter
Dimensions of wall bracket:
▲ Figure 4.3 Inverter wall mounting
Please see Figure 4.4 and Figure 4.5 for instruction on mounting the inverter.
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NOTE:
Nothing should be stored on or placed against the inverter.
It is not allowed to lay the machine horizontally for a long time, which will affect
the heat dissipation.
The inverter shall be mounted vertically. The steps to mount the inverter are listed
below:
1. According to Figure 4.2, select the bracket mounting height and mark the mounting
hole. After marking, punch the hole according to the mark. For brick wall drilling,
expansion bolts shall be suitable for fixing.
Bracket
Self tapping screw
Expansion pipe
• Install vertically with a maximum incline of +/-5° . If the mounted inverter is tilted to an angle
greater than the maximum noted, heat dissipation can be inhibited, and may result in less
than expected output power.

3. Use the suitable screws to fix the bracket to the wall.
WARNING:
The inverter must be mounted vertically.
4.Lift up the inverter (be careful to avoid body strain), and align the back bracket on the inverter
with the convex section of the mounting bracket. Hang the inverter on the mounting bracket
and make sure the inverter is secure (see Figure 4.5).
▲ Figure 4.5 Wall Mount Bracket
5. Use M screws in accessory to lock the inverter to the mount bracket. 4
4.3 Electrical Connections
4.3.1 Connect PV side of inverter
The electrical connection of the inverter must follow the steps listed below:
1. Switch the Grid Supply Main Switch (AC) OFF.
2. Switch the DC Isolator OFF.
3. Assemble PV input connector to the Inverter.
Check whether the polarity of the connecting cable of the photovoltaic string is
correct, and ensure that the open circuit voltage under any condition does not
exceed the upper limit of the inverter input value of 1100V.
Before connection, please make sure the polarity of the output voltage of PV
array matches the "PV+" and "PV-" symbols.
Please don't connect PV array positive or negative pole to the ground, it could
cause serious damages to the inverter.
▲ Figure 4.6 PV+ Connector ▲ Figure 4.7 PV- Connector
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2. Make sure that the bracket is horizontal and the mounting hole (as shown in Figure 4.4)
is correctly marked, and drive the expansion pipe into the wall with a hammer.
Locking screws

Check the positive and negative polarity of the PV strings, and connect the PV
connectors to the right terminals. Serious damages to the inverter and connector over
temperature may occur.
Please use approved DC cable for PV system.
Industry generic PV cable(model:PV1-F) 4.0-6.0 (12-10AWG) 4.0 (12AWG)
▲ Table 4.1 DC cable
The steps to assemble the DC connectors are listed as follows:
1.Strip off the DC wire for about 7mm, Disassemble the connector cap nut.
▲ Figure 4.8 Disassemble the Connector Cap nut
2.Insert the wire into the connector cap nutand contact pin.
▲ Figure 4.9 Insert the Wire into the Connector Cap nut and contact pin
4.Insert the contact pin to the top part of the connector and screw up the cap nut to the top
part of the connector.
▲ Figure 4.11 Connector with Cap nut Screwed on
5.Then connect the DC connectors to the inverter. Small click will confirm connection.
▲ Figure 4.12 Connect the DC Connectors to the Inverter
Recommended value
Cable type Cross section
Range
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3.Crimp the contact pin to the wire using a proper wire crimper.
▲ Figure 4.10 Crimp the contact pin to the wire
Сrimping plier