EASUN SMG-II-6.2KP Hybrid Solar Inverter User Manual

1. Introduction

This multi-function inverter/charger combines the functions of an inverter, MPPT solar charger, and battery charger to provide uninterruptible power support in a portable size. Its comprehensive LCD display allows for user-configurable and easily accessible button operation for settings such as battery charging current, AC/solar charger priority, and acceptable input voltage, catering to various applications.

1.1 Features

• Pure sine wave inverter
• Inverter running without battery
• Built-in MPPT solar controller
• Configurable input voltage range for home appliances and personal computers via LCD setting
• Configurable battery charging current based on applications via LCD setting
• Configurable AC/Solar Charger priority via LCD setting
• Compatible with mains voltage or generator power
• Auto restart while AC is recovering
• Overload/Over temperature/short circuit protection
• Smart battery charger design for optimized battery performance
• Cold start function
• Built-in parallel board, allowing parallel operation of up to 12 units
• BMS function

1.2 Basic System Architecture

The following diagram illustrates the basic application for this inverter/charger, including connections to solar power, a generator or utility grid, battery packs, and various home appliances.

This inverter can power various appliances in home or office environments, including motor-type appliances such as tube lights, fans, refrigerators, and air conditioners.

1.3 Product Overview

The inverter features an LCD display, status and charging indicators, fault indicator, and function buttons for operation. Key connection ports are located on the rear and bottom of the unit.

Key Components:

1. LCD display
2. Status indicator
3. Charging indicator
4. Fault indicator
5. Function buttons
6. Power on/off switch
7. AC input
8. AC output
9. PV input
10. Battery input
11. Wi-Fi antenna port
12. Parallel communication port (for parallel models only)
13. Grounding
14. RS485 communication port
15. Parallel communication line outlet
16. Battery positive outlet hole
17. Battery negative outlet hole

2. Safety Instructions

WARNING: This chapter contains important safety and operating instructions. Read and keep this manual for future reference.

• Before using the unit, read all instructions and cautionary markings on the unit, the batteries, and all appropriate sections of this manual.
• CAUTION: To reduce risk of injury, charge only deep-cycle lead-acid type rechargeable batteries. Other types of batteries may burst, causing personal injury and damage.
• Do not disassemble the unit. Take it to a qualified service center when service or repair is required. Incorrect re-assembly may result in a risk of electric shock or fire.
• To reduce risk of electric shock, disconnect all wirings before attempting any maintenance or cleaning. Turning off the unit will not reduce this risk.
• CAUTION – Only qualified personnel can install this device with battery.
• NEVER charge a frozen battery.
• For optimum operation of this inverter/charger, please follow required specifications to select appropriate cable size. It's very important to correctly operate this inverter/charger.
• Be very cautious when working with metal tools on or around batteries. A potential risk exists to drop a tool to spark or short circuit batteries or other electrical parts and could cause an explosion.
• Please strictly follow installation procedure when you want to disconnect AC or DC terminals.
• Fuse is provided as over-current protection for the battery supply.
• GROUNDING INSTRUCTIONS: This inverter/charger should be connected to a permanent grounded wiring system. Be sure to comply with local requirements and regulations to install this inverter.
• NEVER cause AC output and DC input short-circuited. Do NOT connect to the mains when DC input short circuits.
• Warning!! Only qualified service persons are able to service this device. If errors still persist after following troubleshooting, please send this inverter/charger back to local dealer or service center for maintenance.

3. Installation

3.1 Unpacking and Inspection

Before installation, please inspect the unit. Ensure that nothing inside the package is damaged. You should have received the following items:

• The unit x 1
• User manual x 1
• Wi-Fi antenna x 1

3.2 Preparation

Before connecting all wirings, remove the bottom cover by unscrewing two screws.

3.3 Mounting the Unit

Consider the following points before selecting where to install the inverter:

• Do not mount the inverter on flammable construction materials.
• Mount on a solid surface.
• Install this inverter at eye level to allow the LCD display to be read at all times.
• The ambient temperature should be between 0°C and 55°C to ensure optimal operation.
• The recommended installation position is to adhere it to the wall vertically.
• Ensure sufficient heat dissipation and space for removing wires by keeping other objects and surfaces clear as shown in the diagram.

SUITABLE FOR MOUNTING ON CONCRETE OR OTHER NON-COMBUSTIBLE SURFACE ONLY.

For proper air circulation to dissipate heat, allow a clearance of approximately 20 cm to the sides and 50 cm above and below the unit. Ensure each unit is installed at the same level.

3.4 Battery Connection

CAUTION: For safety operation and regulation compliance, it's requested to install a separate DC over-current protector or disconnect device between the battery and inverter.

WARNING! All wiring must be performed by qualified personnel. It's very important for system safety and efficient operation to use appropriate cable for battery connection.

Follow these steps to connect the battery:

1. Make positive and negative cables based on recommended terminal size.
2. Connect all battery packs as units require. It's suggested to use recommended battery capacity.
3. Insert battery cable flatly into the battery connector of the inverter and ensure the bolts are tightened with a torque of 2-3Nm. Ensure polarity is correct at both the battery and the inverter/charger, and battery cables are tightly screwed to the battery connector.

Recommended battery cable, stripping length (L2), tinning length (L1), and terminal size:

Video Demonstration: Battery Connection

3.5 AC Input/Output Connection

WARNING: Shock Hazard. Installation must be performed with care due to high battery voltage in series.

CAUTION: Do not place anything between the flat part of the inverter terminal. Otherwise, overheating may occur. Do not apply anti-oxidant substance on the terminals before terminals are connected tightly.

CAUTION: Before making the final DC connection or closing DC breaker/disconnector, be sure positive (+) must be connected to positive (+) and negative (-) must be connected to negative (-).

CAUTION: Before connecting to AC input power source, please install a separate AC breaker between the inverter and AC input power source. This will ensure the inverter can be securely disconnected during maintenance and fully protected from over current of AC input. The recommended spec of AC breaker is 50A.

CAUTION: There are two terminal blocks with “IN” and “OUT” markings. Please do NOT mis-connect input and output connectors.

WARNING! All wiring must be performed by qualified personnel. It's very important for system safety and efficient operation to use appropriate cable for AC input connection.

Follow these steps to implement AC input/output connection:

1. Before making AC input/output connection, be sure to open DC protector or disconnector first.
2. Remove insulation sleeve 10mm for six conductors. Shorten phase L and neutral conductor N 3mm.
3. Insert AC input wires according to polarities indicated on the terminal block and tighten the terminal screws. Be sure to connect PE protective conductor (yellow-green) first, then L (brown or black), and N (blue).
4. Then, insert AC output wires according to polarities indicated on the terminal block and tighten terminal screws. Be sure to connect PE protective conductor (yellow-green) first, then L (brown or black), and N (blue).
5. Make sure the wires are securely connected.

CAUTION: Important - Be sure to connect AC wires with correct polarity. If L and N wires are connected reversely, it may cause utility short-circuited when these inverters are worked in parallel operation.

Recommended cable requirement for AC wires:

Video Demonstration: AC Input/Output Connection

3.6 PV Connection

CAUTION: Before connecting to PV modules, please install separately a DC circuit breaker between the inverter and PV modules.

WARNING! All wiring must be performed by qualified personnel. It's very important for system safety and efficient operation to use appropriate cable for PV module connection.

Follow these steps to implement PV module connection:

1. Remove insulation sleeve 10 mm for positive and negative conductors.
2. Check correct polarity of connection cable from PV modules and PV input connectors. Then, connect positive pole (+) of connection cable to positive pole (+) of PV input connector. Connect negative pole (-) of connection cable to negative pole (-) of PV input connector.
3. Make sure the wires are securely connected.

PV Module Selection Parameters:

• Open circuit Voltage (Voc) of PV modules must not exceed max. PV array open circuit voltage of inverter.
• Open circuit Voltage (Voc) of PV modules should be higher than min. battery voltage.

Inverter Model Solar Charging Mode:

• Max. PV Array Open Circuit Voltage: 500VDC
• PV Array MPPT Voltage Range: 60VDC~500VDC

Video Demonstration: PV Input Connection

3.7 Final Assembly

After connecting all wirings, replace the bottom cover by screwing the two screws back into place.

3.8 Parallel Installation Guide

This inverter can be used in parallel with two different operation modes:

1. Parallel operation in single phase with up to 12 units.
2. Maximum 12 units work together to support three-phase equipment. 10 units support one phase maximum.

Package Contents for Parallel Kit:

• Parallel communication cable

Mounting the Unit for Parallel Operation:

When installing multiple units, ensure proper clearances for heat dissipation (approx. 20 cm to the sides and 50 cm above and below each unit). All units should be installed at the same level.

Wiring Connection for Parallel Operation:

NOTICE: It's requested to connect to battery for parallel operation.

The cable size for each inverter is the same as for single unit operation. Ensure all battery cables are of the same length to avoid voltage differences. For AC input and output, follow the same principle.

CAUTION: Install breakers at the battery and AC input side to ensure secure disconnection and over-current protection.

Recommended breaker specification of AC input with single phase:

Note: You can also use a 40A breaker (50A for 6.2KVA) for only 1 unit, with each inverter having a breaker at its AC input.

Recommended battery capacity for parallel operation:

WARNING! Ensure all inverters share the same battery bank. Otherwise, the inverters will transfer to fault mode.

3.9 Wi-Fi Module Installation

The Wi-Fi module allows for remote monitoring and control of the inverter. Follow these steps for installation and setup:

1. Install the Wi-Fi module into the designated port on the inverter.
2. Connect the communication interface between the battery and the inverter (RS485 port).

Video Demonstration: Wi-Fi Module and Communication Cable Connection

Wi-Fi Plug Pro Quick Installation Guideline:

1. Schematic diagram of the Remove and install the wireless antenna.

2. Add Datalogger:

• Login to your account and click the Datalogger button. Tap the "+" button on the top-right corner of the datalogger page.
• According to the prompts, type in the information to finish adding the datalogger. The PN number is located next to the machine appliance label. (Initial Password: 12345678)

3. Download the APP:

• Scan the QR code to download the APP (iPhone App Store; Android phone).
• Open the APP, click "Registration", and select "Mobile phone Registration" or "Email Registration".
• Turn on Bluetooth or WiFi as needed.

4. Bluetooth connected to the digital collector:

• Click "Toolbox" and select "BLE network" or "Wi-Fi network" as required.
• If you choose Bluetooth distribution network, you will automatically scan the nearby device on the "Bluetooth Pairing" page, find the PN corresponding to the digital collector, and click "Connect".

5. Networking Settings:

• Select the corresponding 2.4G WiFi, fill in the password, and click "Start Connecting to the Network".

4. Operation

4.1 Power ON/OFF

Once the unit has been properly installed and the batteries are connected, simply press the On/Off switch (located on the bottom of the case) to turn on the unit.

Video Demonstration: Power On

4.2 Operation and Display Panel

The operation and display panel, located on the front panel of the inverter, includes three indicators, four function keys, and an LCD display, showing the operating status and input/output power information.

4.3 LCD Display Icons

The LCD display information switches in turns by pressing “UP” or “DOWN” keys. The selectable information includes input voltage, input frequency, PV voltage, MPPT charging current, MPPT charging power, charging current, charging power, battery voltage, output voltage, output frequency, load percentage, load in VA, load in Watt, DC discharging current, main CPU Version, and second CPU Version.

4.4 LCD Setting

After pressing and holding the ENTER button for 3 seconds, the unit will enter setting mode. Use "UP" or "DOWN" buttons to select setting programs, then press "ENTER" to confirm or "ESC" to exit.

Key settings include:

• Program 01: Output source priority (Solar first, Utility first, SBU priority, SUB priority)
• Program 02: Maximum charging current (60A default)
• Program 03: AC input voltage range (Appliances, UPS, Generator)
• Program 04: Power saving mode enable/disable
• Program 05: Battery type (AGM, Flooded, User-Defined, Lithium protocols)
• Program 06: Auto restart when overload occurs
• Program 07: Auto restart when over temperature occurs
• Program 08: Output voltage (220V, 230V, 240V)
• Program 09: Output frequency (50Hz, 60Hz)
• Program 10: Auto bypass (manual, auto)
• Program 11: Maximum utility charging current (30A default)
• Program 12: Setting voltage point back to utility source
• Program 13: Battery fully charged voltage
• Program 16: Charger source priority (Solar first, Utility first, Solar and Utility, Only Solar)
• Program 18: Buzzer mode (various modes for warnings/faults)
• Program 19: Auto return to default display screen
• Program 20: Backlight control
• Program 23: Overload bypass
• Program 25: Modbus ID Setting
• Program 26: Bulk charging voltage (C.V voltage)
• Program 27: Floating charging voltage
• Program 29: Low DC cut-off voltage
• Program 32: Bulk charging time (C.V stage)
• Program 33: Battery equalization
• Program 34: Battery equalization voltage
• Program 35: Battery equalized time
• Program 36: Battery equalized timeout
• Program 37: Equalization interval
• Program 39: Equalization activated immediately
• Program 41: Automatic activation for lithium battery
• Program 42: Manual activation for lithium battery
• Program 43: Setting SOC point back to utility source
• Program 44: Setting SOC point back to battery mode
• Program 45: Low DC cut-off SOC
• Program 46: Maximum discharge current protection
• Program 48: Lithium activation time

4.5 Operating Mode Description

The inverter operates in various modes depending on the power sources available and configured priorities.

5. Specifications

5.1 Table 1 Line Mode Specifications

5.2 Table 2 Inverter Mode Specifications

5.3 Table 3 Charge Mode Specifications

5.4 Table 4 General Specifications

6. Troubleshooting

This section provides common issues, their possible causes, and recommended solutions.

6.1 Fault Reference Code

6.2 Warning Indicator

7. Maintenance

Regular maintenance is crucial for the longevity and optimal performance of your EASUN SMG-II-6.2KP Hybrid Solar Inverter. Always ensure the unit is disconnected from all power sources (AC, DC, PV) before performing any maintenance.

• Cleaning: Periodically clean the exterior of the inverter and ensure ventilation openings are free from dust and debris to prevent overheating. Use a dry cloth; do not use liquid cleaners.
• Connection Checks: Regularly inspect all wiring connections (battery, AC input/output, PV input) for tightness and signs of corrosion or damage. Loose connections can lead to poor performance or safety hazards.
• Battery Health: Monitor battery voltage and performance. Ensure batteries are not overcharged or deeply discharged, which can shorten their lifespan. If using lithium batteries with BMS, ensure proper communication is maintained.
• Environmental Conditions: Ensure the inverter operates within the specified temperature and humidity ranges. Avoid exposing the unit to direct sunlight, rain, or excessive moisture.
• Professional Service: Any internal repairs or complex troubleshooting should only be performed by qualified service personnel. Do not attempt to disassemble the unit yourself.

8. User Tips

• Optimize Charging: Adjust the battery charging current and priority settings via the LCD to match your specific battery type and application needs for optimal performance and battery lifespan.
• Monitor Performance: Regularly check the LCD display for input/output voltage, frequency, and load percentage to ensure the system is operating efficiently.
• Parallel System Setup: When setting up multiple inverters in parallel, ensure all units are connected to the same battery bank and that communication cables are securely connected to prevent fault modes.
• Wi-Fi Monitoring: Utilize the Wi-Fi module and mobile app for remote monitoring of your inverter's status and performance, allowing for convenient management and early detection of potential issues.
• Proper Ventilation: Always ensure adequate clearance around the inverter for proper airflow to prevent overheating, especially in parallel installations.

9. Warranty and Support

For warranty information, technical support, or service inquiries, please contact your original point of purchase or an authorized EASUN POWER service center. Keep your purchase receipt and product serial number handy for any claims.

Refer to the official user manual PDF for detailed warranty terms and conditions: User manual (PDF).