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User
Manual
XG3-10KTL
Grid-tied Solar Inverter
INVT Solar Technology (Shenzhen) Co., Ltd.
Preface
The manual is intended to provide detailed information of product, installation, application, trouble shooting, precautions and maintenance of iMars series grid-tied solar inverter. The manual does not contain all the information of photovoltaic system. Please read this manual carefully and follow all safety precautions seriously before any moving, installation, operation and maintenance to ensure correct use and high performance of operation on the inverter.
The use of the iMars series grid-tied solar inverters must comply with local laws and regulations on grid-tied power generation.
The manual needs to be kept well and be available at all times.
All rights reserved. The contents in this document are subject to change without notice.
There might be some deviations on actual inverter and data due to product updating, please refer to the actual product.
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Grid-tied single-phase solar inverter Contents
Contents
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Grid-tied single-phase solar inverter Contents
iii
Grid-tied single -phase solar inverter Safety precautions
1. Safety precautions
iMars series grid-tied solar inverters are designed and tested strictly in accordance with relevant international safety standards. As an electrical and electronic device, all relevant safety regulations must be strictly complied during installation, operation, and maintenance. Incorrect use or misuse may result in ：
Injury to the life and personal safety of the operator or other people.
Damage to the inverter or other property belonging to the operator or other people.
In order to avoid personal injury, damage to the inverter or other devices, please strictly observe the following safety precautions.
This chapter mainly describes various warning symbols in operation manual and provides safety instructions for the installation, operation, maintenance and use of the iMars series grid-tied solar inverters.
1.1Warning marks
Warning marks is alerting users to conditions which may cause serious physical injury or death, or damage to the device. They also tell users how to prevent the dangers. The warning marks used in this operation manual are shown below:
Mark Name Instruction Abbreviation
Danger
Serious physical injury or even death may occur if not follow relevant requirements.
Danger
Warning
Physical injury or damage to the device may occur if not follow relevant requirements.
Warning lectrostatic sensitive
Damage may occur if relevant requirements are not followed.
Forbid
Hot
Note
High temperature
Note
Do not touch the base of the inverter as it will become hot.
The procedures taken for ensuring proper operation.
1
Note
Grid-tied single -phase solar inverter
1.2 Safety guidance
Safety precautions
After receiving this product, first please confirm the product package is intact. If any question, please contact the logistic company or local distributor immediately.
The installation and operation of PV inverter must be carried out by professional technicians who have received professional training and thoroughly familiar with all the contents in this manual and the safety requirements of the electrical system.
Do not carry out cable connection/disconnection, cover open for inspection and unit replacement operations on the inverter when power is connected. Before wiring and inspection, users must confirm the breakers on DC and AC side are disconnected and wait for at least 5 minutes.
Ensure there is no strong electromagnetic interference caused by other electronic or electrical devices around the installation site.
Do not refit the inverter unless authorized.
All the electrical installation must conform to local and national electrical standards.
Do not touch the housing of the inverter or the radiator to avoid scald as they may become hot during operation
Must be reliably grounded before operation.
Do not open the surface cover of the inverter unless authorized. The electronic components inside the inverter are electrostatic sensitive. Do take proper anti-electrostatic measures during authorized operation.
Grounding mark. The inverter must be reliably grounded.
Discharging mark. Ensure that DC and AC side circuit breakers have been disconnected and wait at least 5 minutes before wiring and checking.
Note: Technical personnel who can perform installation, wiring, commissioning, maintenance, troubleshooting and replacement of the iMars series grid-tied solar inverters must meet the following requirements:
Operators need professional training.
Operators must read this manual completely and master the related safety precautions.
Operators need to be familiar with the relevant safety regulations for electrical systems.
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Grid-tied single -phase solar inverter Safety precautions
Operators need to be fully familiar with the composition and operating principle of the entire grid-tied photovoltaic power generation system and related standards of the countries/regions in which the project is located.
Operators must wear personal protective equipment.
1.2.1 Transport and installation
During storage or transport, ensure the inverter package and the chassis is intact, dry and clean.
The movement and installation of the inverter require at least two persons due to its heavy weight.
Select proper tools for movement and installation to ensure the inverter can operate normally and avoid physical injury. The installation personnel must take mechanical protective measures such as wearing anti-drop shoes or working clothes to protect physical security.
The inverter must be installed by professional technicians.
Do not store or install the inverter on or close to flammable and explosive objects;
Do not install the inverter in the place where children and other public can easily touch
Remove the metal accessories in hands eg ring or bracelet before device installation and electrical connection to avoid electric shock.
The solar cell module exposed to the sunlight may generate dangerous voltage.
Users must cover the solar cell with fully-lightproof materials before electrical connection
The inverter input voltage cannot exceed the max input voltage, otherwise the inverter may be damaged.
PV grid-connected inverter is not applicable to the positive or negative ground system of solar cell panel.
Ensure inverter PE is grounded properly, otherwise the inverter cannot run normally.
Ensure the inverter is installed firmly and electrical wiring is reliable.
Note: PV grid-connected inverter is only suitable for crystalline silicon-type solar battery component.
1.2.2 Grid-connected operation
Permissions by local electric power agency must be obtained and the inverter grid-connected power generation operation must be done by professional technicians.
All electrical connections must meet the electrical standards of the
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Grid-tied single -phase solar inverter Safety precautions countries/regions in which the project is located.
Ensure the inverter is installed firmly and electrical wiring is reliable before operating on the inverter.
Do not open the inverter when it is running or connecting power
1.2.3 Maintenance and inspection
The maintenance, inspection and repair of the inverter must be done by well trained and qualified professional technicians.
Contact distributor or manufacture for inverter repairing.
In order to avoid irrelevant personnel entering the maintenance area during maintenance, temporary warning labels must be placed to warn non-professionals to enter or please isolate with fences.
Before carrying out any maintenance operations, users must disconnect the breaker on grid side, then disconnect the breaker connected to the PV module and wait at least 5 minutes until the internal parts of the inverter are fully discharged.
The internal of inverter are mostly electrostatic-sensitive circuits and parts, users must follow electrostatic protection rules and take anti-electrostatic measures.
Do not use components provided by other companies when repairing the inverter.
The inverter can be started again for grid-connected power generation only after confirming there is no fault that may impact the safety performance of the inverter.
Do not get close to or touch the grid or any metal conductive parts in the PV power generation system during operation, otherwise electric shock or fire may occur. Take note of any safety marks and instructions such as “Danger, electric shock risk”.
1.2.4 Waste disposal
Do not dispose of the inverter together with household waste. The user has the responsibility and obligation to send it to the designated organization for recycling and disposal.
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Grid-tied single -phase solar inverter
2 Product overview
Product overview
This chapter mainly introduces the appearance, package accessories, nameplate, technical parameters of the grid-connected inverter.
2.1 PV grid-connected power generation system
PV grid-connected power generation system is comprised of solar battery component, grid-connected inverter and public grid.
Fig 2.1 Application of PV grid-connected inverter
The PV grid-connected inverter is the core part of solar PV grid-connected power generation system.
The sunlight can be converted through PV panel to DC power, which further converted by grid-tied inverter to the sine AC current with the same frequency and phase position as the public grid, then feedback the AC power to the grid.
The PV grid-tied inverter is only for the solar PV power generation grid-tied system, and only uses the Crystalline Silicon Solar Cells whose positive and negative electrodes are not grounded as the DC input.
It is recommended that the PV array to be installed conforms to IEC 61730 class A standards.
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Grid-tied single -phase solar inverter
2.2 Product appearance
Product overview
Figure 2.3 Appearance of the single-phase PV inverter
Table 2-1 Description of key exterior components of single-phase PV inverters
Number Name Introduction
1 DC switch Close/disconnect the PV array
2
3
4
DC input interface
Communication interface
RS485-1
Inverter DC input terminal, connected to the PV array
CT,DRM interface
485 communication interface
5 AC terminal
6
7
8
Ground terminal
LED pilot lamp
Nameplate
Inverter AC output port, connect to public grid
There are two in total, choose at least one of them to connect
Instructions inverter current working condition
Mark the inverter rating parameter
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Grid-tied single -phase solar inverter
2.3 Nameplate description
Figure 2.4 shows the inverter nameplate.
Product overview
Figure 2.4 Nameplate
（ 1 ） Trademarks and product types
（ 2 ） Model and important technical parameters
（ 3 ） Certification system of the inverter confirming, serial number, company name and country of origin
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Grid-tied single -phase solar inverter
Icons Instruction
TUV certification mark. The inverter is certified by TUV
Product overview
CE certification mark. The inverter complies with the CE directive
CQC certification mark. The inverter passed CQC certification
EU WEEE mark. The inverter cannot be disposed of as domestic waste
2.4 Product model
Table 2-2 Models of single-phase PV grid-connected inverters
Product name Model Rated output power (W)
Single-phase （ L 、 N 、 PE ）
Single-phase PV grid-connected inverter XG3KTL-2M 3000
Single -phase PV grid-connected inverter XG4KTL 4000
Single -phase PV grid-connected inverter XG5KTL 5000
Single -phase PV grid-connected inverter XG6KTL 6000
Single -phase PV grid-connected inverter XG7KTL 7000
Single -phase PV grid-connected inverter XG8KTL 8000
Single -phase PV grid-connected inverter XG10KTL 10000
Single -phase PV grid-connected inverter XG7KTL1 7000
Single -phase PV grid-connected inverter XG8KTL1 8000
Single -phase PV grid-connected inverter XG10KTL1 10000
Note: Technical parameters of PV grid-connected inverter refer to the appendix.
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Grid-tied single -phase solar inverter
2.5 Outline dimension and weight
Product overview
Figure 2.5 Outline dimensions of the inverter
Table 2-3 Dimensions and net weight of the inverter
Model Height(mm) Width(mm) Depth(mm)
XG5KTL
XG8KTL
XG10KTL
380
380
380
380
380
380
160
160
160
Net weight(kg)
12
12.6
13.0
Fig 2.6 Dimension of paper package
Table 2-4 Dimension and gross weight
Model
Height
(mm)
Width
(mm)
Depth
(mm)
XG5KTL 465 485 270
Weight
(kg)
14.0
XG8KTL 465 485 270 14.6
XG10KTL 465 485
9
270 15.0
Package material
Corrugated case
Corrugated case
Corrugated case
Grid-tied single -phase solar inverter
2.6 The LED light panel
Product overview
The LED indicator panel as the human-computer interaction interface, may indicate the working state of the inverter.
2.6.1 The LED light panel
LED indicator status description ：
Figure 2.7 LED Front View
Steady blue
Blinking blue at short interval (0.2s)
Blinking blue at long interval (2s)
Steady red
Blinking red
Red light off
Normal, grid-tied and generating power
Bluetooth connected and with communication. And inverter has no error
DC or AC connected, inverter in standby or starting (no power generation)
Error occurs.( The inverter fail to connect to the grid)
Bluetooth connected and in communicating but inverter has error
AC and DC have been powered off.
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Grid-tied single -phase solar inverter
2.6.2 LCD operation panel
Product overview
Definition of LCD operation panel:
Figure 2.8 LCD Front View
① ”Run”, running status, shows green light ；
② "Fault", the PV string is disconnected, shows red light;
③ Select upwards, short press to move upwards, long press to return;
④ Select downward, short press to move down, long press to confirm.
LED light display status description ：
Indicator light
Instruction State
Green light on
Run
Grid-connected indicator light
Green light off
Green light flashes
0.5s On, 0.5s Off)
Fault
The PV connection indicator light
Red light on
Red light off
Description connected to grid
Not connected to grid
The inverter is in maintenance status
The power-on indicator light, it indicates that at least one of the
PV strings is connected normally and the input voltage is ≥150V
The inverter is disconnected from all PV strings, or the DC input voltage of all MPPT circuits is less than 150V
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Grid-tied single -phase solar inverter
2.7 Bottom of the inverter
XG3-10KTL is equipped with a DC switch that controls the DC terminal switch.
Product overview
Figure 2.9 without fan
Figure 2.10 with fan( XG7KTL1, XG8KTL1, XG10KTL, XG10KTL1 )
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Grid-tied single -phase solar inverter Inverter storage
3 Inverter storage
If the inverter is not put into use immediately, the storage of inverter should meet the following requirements:
Do not remove the inverter outer package.
The inverter needs to be stored in a clean and dry place, and to prevent the erosion of dust and moisture.
The storage temperature should be kept at -30 ℃ ~+70 ℃ , and the relative humidity should be kept at 0%RH~100f%RH.
If multiple inverters to be stacked, it is recommended to place them according to the original
stacking layer number at the time of delivery. When stacking, please place the inverter carefully to avoid personal injury or equipment damage caused by equipment tipping.
Avoid chemical corrosive substances, otherwise it may corrode the inverter.
During storage, regular inspections are required. If insect bites or packaging damage are found, the packaging materials must be replaced in time. After long-term storage, the inverter needs to be inspected and tested by professionals before it can be put into use.
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Grid-tied single -phase solar inverter Installation
4 Installation
This chapter introduces the installation of the inverter and the connection of the inverter to the PV power generation system. Connecting inverters to PV power generation systems mainly involves the
PV strings and public grids connect to the inverter.
Please read this chapter carefully before installation, and ensure that all installation conditions are met by professional technicians to complete the inverter installation.
4.1 Unpacking confirmation
The inverter has been thoroughly tested and rigorously checked before delivery, but damage may still occur during transportation. Before unpacking, check carefully whether the product information in the order is consistent with that on the nameplate of the package box and whether the product package is intact. If any damage is detected, please contact the shipping company or the supplier directly. Please also provide photos of the damage to get our fastest and best service.
When the inverter is left unused, please put it in the original packing box and take measures to prevent moisture and dust.
Take out the inverter after unpacking, please check the following items:
(1) Confirm that the inverter is complete and not damaged;
(2) Confirm that there are manuals, interface accessories and installation accessories in the packing box;
(3) Confirm that there is no damage or shortage in the delivery content in the packing box;
(4) Check whether the order is consistent with the product information on the nameplate of the inverter;
(5) The standard delivery list is as follows.
Standard deliverables of single-phase inverter:
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Grid-tied single -phase solar inverter Installation
Fig4.1 Delivery content of single-phase inverter 3-10kW
Table 4-1 delivery contents of three-phase inverter
Number
1
Name
Inverter
Quantity
1
2
3
4
5
6
7
8
9
10
Mounting bracket
AC side quick connect terminal
CT,DRM Connect the terminals
DC connector (pair)
User manual
Stainless Steel Expansion Bolts
M6*50
M6 combination bolt
M4combination bolt
M6 nut
1
1
1
2
1
4
4
4
4
11 M6 Flat Washer 4
Please check the above carefully. If you have any questions, please contact the supplier in time.
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Grid-tied single -phase solar inverter
4.2 Prepare before installation
4.2.1 Installation tool
Table 4-2 List of installation tools
Number
3
4
1
2
5
Installation tools
Marker pen
Electric drill
Hand hammer
Adjustable wrench
"Flat" or "Cross" screwdriver
6
9
10
7
8
Meg ohmmeter
Multi-meter
Electric soldering iron
Crimping Tool
Hydraulic clamp
instruction
Mark the mounting holes
Drill holes in the bracket or wall
Knock the expansion bolt
For fixed mounting bracket
Installation
For AC wiring
Measure insulation performance and impedance to ground
Detect circuit and measure AC and DC voltage
Welding communication cable
Crimp DC terminal
Crimp ring terminal for AC wiring
4.2.2 Installation environment
(1) The inverter can be installed in indoor and outdoor environment.
(2) During the operation of the inverter, the temperature of the chassis and heat sink will be relatively high. Please do not install the inverter in the easily touched position.
(3) Do not install inverters in areas where flammable and explosive materials are stored.
(4) The inverter shall be installed in a well-ventilated environment to ensure inverter heat dissipation.
(5) It is recommended to choose the installation site with shelter or build
Fig 4.2 Sunshade
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Grid-tied single -phase solar inverter Installation
(6) The installation environment temperature is - 30 ℃ ~ 60 ℃ ;
(7) The installation site should be far away from the electronic equipment with strong electromagnetic interference;
(8) The installation site should be fixed and solid object surface, such as wall, metal support, etc;
(9) The installation position shall ensure the reliable grounding of the inverter, and the grounding metal conductor material shall be consistent with the reserved grounding metal material of the inverter.
4.3 Space requirements
(1) The height of installation position shall ensure that the line of sight and LED display light are on the same horizontal plane, so as to check the inverter status conveniently .
Fig4.3 Optimum installation height area
(2) There is enough reserved space around the installation site to facilitate the disassembly and assembly of inverter and air convection. As shown in Fig 4.3.
Fig 4.4 Installation spacing of inverter
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Grid-tied single -phase solar inverter Installation
(3) When installing multiple inverters, a certain distance shall be reserved between the inverters, as shown in Figure 4.4. At the same time, sufficient distance shall be reserved between the upper and lower parts of the inverter to ensure good heat dissipation 。
Fig 4.5 Size requirements for side-by-side installation
(4) The installation surface should be perpendicular to the horizontal line, as shown in Figure 4.5.
Please install the inverter vertically or backward ≤15° to facilitate the heat dissipation of the machine.
Do not tilt the inverter forward, horizontally, upside down, leaning too far, or tilting to the side.
Fig 4.6 Installation position of inverter
4.4 Mounting board size
Fig 4.7 Dimensions of the mounting plate
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Grid-tied single -phase solar inverter
4.5 Wall installation
Installation
Step 1 ： Place the hanging board on the wall mounting point, use a level to adjust the angle, and mark with a marker.
Step 2: Use a hammer drill to drill holes and install expansion bolts. Use M6×50 stainless steel pressure explosion expansion bolts.
Step 3: Fix the hanging board. Clean the holes, use a rubber hammer to drive the expansion bolt into the hole, use a wrench to tighten the nut to fix the end of the bolt, then remove the nut, spring washer and flat washer, and then fix the wall mount plate to the wall and lock it with a tightening torque of 13N*m 。 .
4.6 Install the inverter
Step 1: Take the inverter out of the packaging box.
Step 2: If the installation location is high, you need to lift the inverter to the hanging plate, use the lifting equipment to lift the inverter 100mm off the ground and then pause, check the tightness of the
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Grid-tied single -phase solar inverter Installation hoisting ring and rope. After confirming that the connection is secure, lift the inverter to the destination.
Step 3: After lifting the inverter, buckle the bracket plate on the back of the machine into the wall-mounting plate, and make sure that the machine bracket plate fits well with the groove of the hanging plate.
Step 4: After the inverter is stably hung on the wall mount, fix the M4 screws on the left and right of the chassis.
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Grid-tied single -phase solar inverter Electrical connection
5 Electrical connection
5.1 Overview of electrical connections
This section will introduce the electrical connection related content and related safety precautions in detail.
F
Note
ig 5.1 Schematic diagram of PV grid-connected system connection
Electrical connections must be completed by professional worker. Wrong operation may cause equipment damage during system operation, and even personal injury.
All electrical installations must comply with national/regional electrical safety regulations.
Ensure that all cables are installed tightly, without any damage, and meet the specified safety requirements.
It is not allowed to turn on the AC and DC circuit breakers before the inverter completes the electrical connection and check.
Read this section carefully and operate strictly according to the requirements.
Pay attention to the rated voltage and current values specified in this manual, and do not exceed the limit values specified in this manual.
5.2 Connect the protective ground wire
Step 1: Crimp the OT terminal to the ground wire
Step 2: Remove the screws in the ground position on the bottom of the chassis, fix the ground wire with the screw and tighten the tightening torque 7-9N•m.
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Grid-tied single -phase solar inverter Electrical connection
Fig 5.2 PV grounding diagram
The inverter must be grounded through the side screws to ensure reliable grounding and reliable lightning protection.
5.3 Connection of PV string
Step 1: Connect the outlet line of the PV panel to the MC4 terminal delivered by the machine
The MC4 terminal crimping method is as follows:
(1) As shown in Fig 5.2, connect the output wire of the PV string to the DC connector of the inverter.
Loosen the fastening nut of the connector; strip off the 15mm insulation layer of the DC cable, and use crimping pliers to press the standard metal terminal tightly. The tightening torque of the waterproof part at the tail is 2.5-3Nm. The wiring method of the positive and negative connectors is the same. Confirm that the positive and negative poles of the PV string correspond correctly to the positive and negative connectors ,then connect them firmly;
Fig 5.3 Connection between MC4 DC connector and PV string
(2) After the DC connector is connected, use a multi-meter to measure the voltage of the DC input
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Grid-tied single -phase solar inverter Electrical connection string, verify the polarity of the DC input cable, and ensure that the voltage of each string is within the allowable range of the inverter, as shown in Fig 5.3.
Fig 5.4 Measuring DC input voltage
The PV string connected to iMars series inverter must adopt the DC connector configured especially for the inverter, do not use other connection devices without authorization from our company, otherwise damage to the device, unstable operation or fire may occur and our company will not undertake quality assurance or assume
(1) Connect the positive and negative connectors of the PV strings that have been connected to the corresponding positions of the inverter DC interface, and confirm the tight connection, as shown in Fig
5.5;
Step 2: After the DC terminal is connected, it is directly connected to the MC4 terminal of the inverter.
(2) When disassembling the DC connector from the inverter, insert the tip of a slotted screwdriver into the raised hole in the middle of the connector, and force the movable end of the connector to withdraw.
Fig 5.5 PV DC string connected to the inverter
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Grid-tied single -phase solar inverter
5.4 Connection of DRM & CT
The picture of DRM & CT connector is as follows ：
Fig 5.6 DRM & CT connector side view
Electrical connection
Fig 5.7 DRM & CT connector Front view
Table 5-1 The DRM & CT connector Signal description
Pin NO.
1
Name
485L-1
Signal name
485L-1
2
485H-1 485H-1
3
485L-2 485L-2
4
485H-2 485H-2
5
External CT input positive CT+
6
External CT input negative pole CT-
7
+5V +5V
8
COM/DRM0 COM/DRM0
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Grid-tied single -phase solar inverter
5.5 Single-phase inverter grid access
Electrical connection
Table 5-2 Single-phase photovoltaic inverter AC connector interface description
Inverter AC connector interface
L
Single-phase grid live wire
Remarks
N neutral line
PE ground wire Must be connected
5.5.1
Connection terminal grid access
(1) According to Table 5-1, the three conductors of single-phase public power grid L, N and PE are correctly connected to the corresponding holes according to the identification, and ensure that the conductors are not exposed and crimped firmly, and finally tighten the waterproof cap, as shown in Fig
5.8;
Fig 5.8 Crimp cable terminal
(2) Connect the AC quick connect terminal to the inverter.
5.5.2
Fig 5.9 Single-phase inverter grid connection
Grid voltage requirements
Before installing the PV inverter, you need to confirm the working voltage of the AC side of the product.
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Grid-tied single -phase solar inverter Running
6 Running
This chapter introduces the related operations during the use of the inverter, which mainly involves pre-operation inspections, grid-connected operation of the inverter, inverter shutdown, and precautions for daily maintenance and repair of the inverter.
6.1 Inspection before running
The following items must be checked strictly before running the PV grid-connected inverter
(including but not limited to the following items):
(1) Confirm the installation site of the inverter meet requirements of section 4.2.2 to ensure convenient installation, disassemble, operation and inspection on the inverter;
(2) Confirm the mechanical installation of the inverter meet requirements of section 5.3;
(3) Confirm the electrical connection of the inverter meet the requirements of section 4.4;
(4) Confirm all the switches are in “OFF” state;
(5) Confirm the open-circuit voltage of PV module conforms to the parameter requirements of inverter DC side in appendix;
(6) Confirm the electrical safety marks on the installation site is clear enough.
In order to ensure a safe, normal and stable operation of the PV power generation system, all the newly installed, renovated and repaired PV grid-connected power generation system and its grid-connected inverter must undergo inspection before running.
6.2 Inverter grid-connected running
Please strictly follow the steps below to turn on the inverter and complete the grid-connected operation of the inverter: ：
For the first operation of the inverter, a country must be selected to set
Note grid-connected standards.
Please keep the inverter powered on for at least 30 minutes, and complete the charging of the built-in clock battery of the inverter to ensure the normal operation of the clock!
(1) Make sure that the inspection items in Section 6.1 meet the requirements;
(2) Turn on the AC side circuit breaker of the inverter public grid;
(3) Turn on the DC switch integrated in the inverter;
(4) Turn on the switch on the DC input side of the photovoltaic string;
(5) Observe the status of the inverter's LED lights or the information displayed on the LCD screen
(refer to section 2.6 for LED status lights and LCD display information);
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Grid-tied single -phase solar inverter Running
(6) Wait for the inverter to connect to the grid successfully.
6.3 Inverter stop
When it is necessary to perform power failure maintenance, overhaul, and troubleshooting of the inverter, please strictly follows the steps below to shut down the inverter:
(1) Disconnect the AC side circuit breaker of the inverter public grid;
(2) Disconnect the DC switch integrated in the inverter;
(3) Disconnect the line switch on the DC input side of the photovoltaic string;
(4) Wait at least 3 minutes until the internal components of the inverter are discharged, and the inverter shutdown operation is completed.
6.4 Daily maintenance and inspection
In the PV grid-connected system, even if the day and night change and the season changes, the PV grid-connected inverter can automatically complete grid-connected power generation, shutdown and start-up operations without human control. In order to ensure and prolong the service life of the inverter, in addition to using the inverter in strict accordance with the content specified in this manual, it is also necessary to carry out the necessary daily maintenance and inspection of the inverter.
6.4.1 Periodic maintenance on the inverter
Check Item Inspection Method
Maintenance
Cycle
Save inverter operating data
Inverter running status
Clean the inverter
The monitoring software is used to read the data of the inverter in real time, and the data recorded by the monitoring software is regularly backed up. Save the inverter's operating data, parameters and logs recorded in the monitoring software to a file. Check the monitoring software and check the inverter parameter settings through the handheld keyboard.
Observe whether the inverter is installed firmly and whether it is damaged or deformed. To listen whether there’s any abnormal sound during inverter running.
When the system is connected to the grid, check various variables. Check whether the heating of the inverter shell is normal, and use a thermal imager to monitor the heating of the system.
Check the RH and dust around the inverter, and clean the inverter when necessary. Refer to section 6.4.2.
Once per quarter
Once per half a year
Once per half a year
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Grid-tied single -phase solar inverter Running
Check Item Inspection Method
Maintenance
Cycle
Electrical connections
Cooling fan maintenance and replacement
Security function
Check whether the system cable connection is loose, whether the inverter wiring terminal is loose, and then tighten it according to the method specified in section 4.
Check whether the cable is damaged, especially whether the rubber skin in contact with the metal surface has cut marks.
For three-phase inverter products, observe whether the air inlet and outlet are normal, and check whether there are cracks in the fan blades. Listen for abnormal vibration when the fan is running. If necessary, clean the air inlet and outlet; if the fan is abnormal, it needs to be replaced in time, see section 6.4.2.
Check the inverter LCD and the shutdown function of the system. Simulate stop and check the stop signal communication. Check the warning labels and replace them if necessary.
Once per half a year
Once per half a year
Once per half a year
6.4.2 Maintenance guidance
Inverter cleaning
The cleaning steps are as follows:
(1) Disconnect the input and output connections.
(2) Wait ten minutes.
(3) Use a soft brush or vacuum cleaner to clean the surface of the inverter and the air inlet and outlet.
(4) Repeat the operation content in section 6.1.
(5) Restart the inverter.
Fan maintenance
Stop the inverter before maintenance work, and all power inputs of the inverter must be disconnected.
Wait at least 3 minutes for the capacitors inside the inverter to fully discharge before starting maintenance work.
Only professional electricians can perform maintenance and replacement of the fan.
28
Grid-tied single -phase solar inverter Running
Step 1: Stop the inverter and disconnect the electrical connection.
(1) Disconnect the input and output connections.
(2) Turn the DC switch to the "OFF" position.
(3) Wait ten minutes.
(4) Disconnect all electrical connections at the bottom of the inverter.
Step 2: Disconnect the fan power plug and remove the fan cover at the bottom of the chassis.
Step 3: Use a soft brush or vacuum cleaner to clean the fan. If the fan is damaged, follow step 4.
Step 4: If the fan is damaged, remove the damaged fan and install the good fan to its original position.
Step 5 : Re-install the fan tray to the inverter in the reverse order and restart the inverter.
。
Note
Once the inverter stops due to an alarm, it is prohibited to start the inverter immediately. You should find out the cause and confirm that all faults have been eliminated before starting the inverter. The inspection should be carried out strictly in accordance with the steps in section 6.1.
29
Grid-tied single -phase solar inverter Troubleshooting
7 Troubleshooting
This chapter introduces fault alarms and codes, which are used to quickly find inverter faults.
Table 7-1 Inverter fault codes
Number Fault types
Fault code
Fault information Solution
1
PV voltage fault
01-01
01-02
Low PV voltage
High PV voltage
Check wether the PV terminal is plugged in properly
Check wether the panels are connected in series correctly
03-01 Low BUS voltage
2
BUS voltage error
03-02
03-03
High BUS voltage
BUS voltage imbalance
If the inverter does not work normally, please contact customer service
3
4
5
6
Flow failures
Thermal failure
Insulation detection fault
Drive fault
05-01
05-02
05-03
05-04
06-01
06-02
06-03
06-04
07-01
08-01
Inverter hardware flow
Inverter software flow
The BOOST hardware flow
The BOOST software flow
Inverter over temperature
BOOST over temperature
Heatsink over temperature
Ambient over temperature
Insulation detection fault
Drive fault
If the fault is reported repeatedly, firstly check whether there is capacitive or inductive equipment on the grid side repeatedly cutting into the grid; if not, please contact customer service
Check whether the air inlet and outlet are blocked and whether the ambient temperature is too high
Check for obstacles around the inverter
Check whether the panel wiring terminals have entered the water, or are damaged and exposed to the ground
Please contact customer service
09-01 DSP1 and ARM SCI fault
7
Communica tion fault
09-02 DSP2 and ARM SCI fault
Please contact customer service
09-03 DSP1 SPI fault
30
Grid-tied single -phase solar inverter
Number Fault types
Fault code
09-04
09-05
10-01
8
9
10
Leakage current fault
Relay fault
DC fault
10-02
10-03
10-04
11-01
11-02
14-01
14-02
14-03
19-01
19-02
11
Consistency failure
12
Mains voltage fault
19-03
19-04
19-05
31-01
31-02
33-01
13
14
15
Mains frequency fault
Leakage current self-checkin g of failure
Auxiliary power failure
33-02
43-01
45-01 Auxiliary power off
Troubleshooting
Fault information
DSP2 SPI fault
DSP1 and MCU SCI fault
The static leakage current is high
30mA mutation failure
60mA mutation failure
150mA mutation failure
Relay open
Relay short circuit
DCI R phase fault
DCI S phase fault
T the DCI fault
Inconsistent AC voltage detection
Inconsistent BUS voltage detection
Inconsistent ISO voltage detection
Inconsistent PV voltage detection
GFCI inconsistent
Low mains voltage
Mains voltage high
Mains frequency is low
Mains frequency is high
Solution
Check whether the panel wiring terminals have entered the water, or are damaged and exposed to the ground
Please contact customer service
Please contact customer service
Please contact customer service
Use a multimeter Check whether the grid voltage at the inverter end is normal
Check with a multimeter whether the grid frequency at the inverter end is normal
Leakage current sensor fault
Please contact customer service
Please contact customer service
31
Grid-tied single -phase solar inverter
Table 7-2 Inverter warning code
Number Alarm types
Alarm code
1
Fan speed is low
01-01
01-02
01-03
01-04
2
Lightning protector
02-01
03-01
03-02
03-03
03-04
3
String current
03-05
03-06
03-07
03-08
Troubleshooting
Alarm information
Fan1
Fan2
Fan3
Fan4
Lightning protector
String 1
String 2
String 3
String 4
String 5
String 6
String 7
String 8
Display information
Please contact customer service
Please contact customer service
Unplug the faulty string, and check if the positive and negative terminals are reversed with a multimeter.
32
Grid-tied single -phase solar inverter
If any problem, please contact with the supplier and provide following information:
Model of the inverter:
Serial No. of the inverter:
System version:
——version 1:
——version 2:
——MCU software version:
Fault code:
;
;
;
Fault description
Troubleshooting
;
;
;
33
Grid-tied single -phase solar inverter
8 Contact information
Contact information
China·Shenzhen
INVT Solar Technology (Shenzhen) Co., Ltd.
Address: 2nd Floor, Block B, Yingweiteng Guangming Technology Building, Songbai Road, Matian
Street, Guangming District, Shenzhen
Service Hotline: +86 400 700 9997
Email: [email protected]
INVT website: www.invt.com
INVT Solar website: www.invt-solar.com
34
Grid-tied single -phase solar inverter
9 Appendix
Table 9-1 Technical parameters of single-phase PV grid-connected inverter
Technical specifications XG3KTL-2M XG4KTL XG5KTL XG6KTL XG7KTL XG7KTL1 XG8KTL
DC side
Maximum input power(W)
Maximum DC voltage
Starting voltage
4500W 6000W 7500W 9000W 10500W 10500W
600V
80V
12000W
MPPT voltage range
Number of MPPT channels
Maximum number of strings per MPPT
Maximum input current per MPPT
Maximum short-circuit current of each MPPT
2
1/1
20A/20A
26A/26A
2
1/1
20A/20A
26A/26A
2
1/1
20A/20A
26A/26A
2
1/1
20A/20A
26A/26A
2
1/1
20A/20A
26A/26A
80V-580V
2
1/2
28A/14A
36.4A/1
8.2A
2
1/1
20A/20A
26A/26A
AC side
Rated output power 3000W 4000W
5000W a
6000W 7000W 7000W 8000W
Rated output voltage
Rated output voltage frequency
Maximum output current
Power factor
15A 20A 25Ad 30A
220Vac/230Vac/240Vac
35A
50Hz/60Hz
35A
0.8 leading to 0.8 lagging
40A
Harmonic distortion
Efficiency
<3%(rated power)
Maximum efficiency
Chinese efficiency
98.1%
97.3%
98.3%
97.4%
98.3%
97.4%
98.3%
97.4%
98.1%
97.3%
Protection function
98.1%
97.3%
98.1%
97.3%
DC switch islanding protection
Output overcurrent protection
DC reverse polarity protection
String fault detection
Insulation resistance detection
AC short-circuit protection
Arc fault protection
√
√
√
√
√
√
√ option
System
Dimensions (W×H×D) weight
Operating temperature range
Maximum allowable altitude
Relative humidity
Protection rating
Inverter topology communication
Display
380*380*160mm
≤13KG
–30℃...+60℃
≤4000m
0-100％
IP66
Transformer-less
RS485/WIFI/4G
LCD/LED/WIFI+APP
35
XG8KTL1
12000W
2
1/2
28A/14A
36.4A/1
8.2A
8000W
40A
98.1%
97.3%
XG10KTL
15000W
2
1/1
20A/20A
26A/26A
10000W
45.5A
98.1%
97.3%
Appendix
XG10KTL1
15000W
2
1/2
28A/14A
36.4A/18.2
A
10000W
45.5A
98.1%
97.3%
Service Hotline: +86 400 700 9997 Email: [email protected] website: www.invt-solar.com
INVT Solar Technology (Shenzhen) Co., Ltd ..
2nd Floor, Block B, Yingweiteng Guangming Technology Building, Songbai Road, Matian
Information may be subject to change without notice during product improving 202212(V1.0)
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