1. Introduction
This multi-function inverter/charger combines the functions of an inverter, solar charger, and battery charger to provide uninterruptible power support in a portable size. Its comprehensive LCD display offers user-configurable and easy-to-access button operation for settings such as battery charging current, AC/solar charger priority, and acceptable input voltage based on different applications.
1.1 Features
- Pure sine wave inverter
- 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, and short circuit protection
- Smart battery charger design for optimized battery performance
- Cold start function
- WIFI (Included, for remote monitoring)
- Can connect to lithium battery
- Intelligent fan speed adjustment
1.2 Basic System Architecture
The following diagram illustrates the basic application for this inverter/charger. It integrates solar power, a generator or utility grid, and battery packs to power 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.
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. Please refer to the INSTALLATION section of this manual for details.
- 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 the troubleshooting table, please send this inverter/charger back to a local dealer or service center for maintenance.
3. Installation and Setup
3.1 Unpacking and Inspection
Before installation, please inspect the unit. Ensure that nothing inside the package is damaged. You should have received the unit and a user manual.
3.2 Mounting the Unit
Consider the following points before selecting where to install:
- 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.
- For proper air circulation to dissipate heat, allow a clearance of approximately 20 cm to the side and 50 cm above and below the unit.
- The ambient temperature should be between 0°C and 55°C to ensure optimal operation.
- The recommended installation position is to be adhered to the wall vertically.
- Be sure to keep other objects and surfaces as shown in the diagram to guarantee sufficient heat dissipation and to have enough space for removing wires.
SUITABLE FOR MOUNTING ON CONCRETE OR OTHER NON-COMBUSTIBLE SURFACE ONLY.
Install the unit by screwing two screws. It's recommended to use M4 or M5 screws.
3.3 Battery Connection
CAUTION: For safety operation and regulation compliance, it's requested to install a separate DC over-current protector or disconnect device between battery and inverter.
WARNING! All wiring must be performed by a qualified personnel. It's very important for system safety and efficient operation to use appropriate cable for battery connection.
Recommended battery cable size:
| Model | Wire Size | Cable (mm²) | Torque value (max) |
|---|---|---|---|
| 2.2KVA 12V | 1 x 4AWG | 22 | 2 Nm |
| 3.2KVA 24V | 1 x 6AWG | 14 | 2 Nm |
Follow these steps for battery connection:
- Remove insulation sleeve 18 mm for positive and negative conductors.
- Suggest to put bootlace ferrules on the end of positive and negative wires with a proper crimping tool.
- Connect all battery packs as shown in the diagram below.
- Insert the battery wires flatly into battery connectors of the inverter and make sure the bolts are tightened with a torque of 2 Nm in clockwise direction. Ensure polarity at both the battery and the inverter/charger is correctly connected and conductors are tightly screwed into the battery terminals. Recommended tool: #2 Pozi Screwdriver.
WARNING: Shock Hazard! Installation must be performed with care due to high battery voltage in series.
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 (-).
3.4 AC Input/Output Connection
CAUTION!! Before connecting to AC input power source, please install a separate AC breaker between the inverter and AC input power source. The recommended spec of AC breaker is 20A for 2.2KVA and 32A for 3.2KVA.
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 a qualified personnel. It's very important for system safety and efficient operation to use appropriate cable for AC input connection.
Suggested cable requirement for AC wires:
| Model | Gauge | Torque Value |
|---|---|---|
| 2.2KVA 12V | 14 AWG | 0.5~0.6Nm |
| 3.2KVA 24V | 12 AWG | 1.2 Nm |
Follow these steps to implement AC input/output connection:
- Before making AC input/output connection, be sure to open DC protector or disconnector first.
- Remove insulation sleeve 10mm for five conductors. And shorten phase L and neutral conductor N 3 mm.
- Insert AC input wires according to polarities indicated on the terminal block and tighten the terminal screws. Be sure to connect PE protective conductor (Earth) first.
- Earth: Ground (yellow-green)
- L: LINE (brown or black)
- N: Neutral (blue)
- Then, insert AC output wires according to polarities indicated on the terminal block and tighten the terminal screws.
- L: LINE (brown or black)
- N: Neutral (blue)
- Make sure the wires are securely connected.
WARNING: Be sure that AC power source is disconnected before attempting to hardwire it to the unit.
CAUTION: Appliances such as air conditioners require at least 2-3 minutes to restart because it takes time to balance refrigerant gas inside of circuits. If a power shortage occurs and recovers quickly, it may damage connected appliances. Check if your air conditioner is equipped with a time-delay function before installation.
3.5 PV Connection
CAUTION: Before connecting to PV modules, please install separately a DC circuit breaker between the inverter and PV modules.
WARNING! It's very important for system safety and efficient operation to use appropriate cable for PV module connection.
Suggested cable requirement for PV wires:
| Model | Wire Size | Torque value (max) |
|---|---|---|
| 2.2KVA 12V | 1x16AWG | 1.2 Nm |
| 3.2KVA 24V | 1x16AWG | 1.2 Nm |
PV Module Selection:
When selecting proper PV modules, please consider the following parameters:
- Open circuit Voltage (Voc) of PV modules must not exceed the max. PV array open circuit voltage of the inverter.
- Open circuit Voltage (Voc) of PV modules should be higher than the minimum battery voltage.
| INVERTER MODEL | iSolar SMH II 2.2KW |
|---|---|
| Maximum output power | 2000W |
| Maximum PV open circuit voltage | 450VDC |
| Maximum charge current | 80A |
| Maximum Power (Pmax) | 250W |
| Max.Power Voltage Vmpp(V) | 36V |
| Max.Power Current Impp(A) | 8.3A |
| Open Circuit Voltage Voc(V) | 40V |
| Short Circuit Current Isc(A) | 8.9A |
PV module numbers in series: 8 x 36V ≈55~450VDC
PV module numbers in parallel: 8 x 8.3 < 80A
Total PV module numbers: 8 x 1 = 8
PV Module Wire Connection:
- Remove insulation sleeve 10 mm for positive and negative conductors.
- Suggest to put bootlace ferrules on the end of positive and negative wires with a proper crimping tool.
- Check correct polarity of wire connection from PV modules and PV input connectors. Then, connect positive pole (+) of connection wire to positive pole (+) of PV input connector. Connect negative pole (-) of connection wire to negative pole (-) of PV input connector. Recommended tool: 4mm blade screwdriver.
3.6 Final Assembly
After connecting all wirings, put the bottom cover back by screwing the four screws.
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.
4.2 Operation and Display Panel
The operation and display panel, shown below, is on the front panel of the inverter. It includes three indicators, four function keys, and an LCD display, indicating the operating status and input/output power information.
LED Indicator and Function Keys
| LED Indicator | Messages |
|---|---|
| AC / INV (Green Solid On) | Output is powered by utility in Line mode. |
| AC / INV (Green Flashing) | Output is powered by battery or PV in battery mode. |
| CHG (Green Solid On) | Battery is fully charged. |
| CHG (Green Flashing) | Battery is charging. |
| FAULT (Red Solid On) | Fault occurs in the inverter. |
| FAULT (Red Flashing) | Warning condition occurs in the inverter. |
| Function Key | Description |
|---|---|
| ESC | To exit setting mode |
| UP | To go to previous selection |
| DOWN | To go to next selection |
| ENTER | To confirm the selection in setting mode or enter setting mode |
4.3 LCD Display Icons
The LCD display provides various icons to indicate the inverter's status and information.
| Icon | Function description |
|---|---|
| AC | Indicates the AC input. |
| PV | Indicates the PV input. |
| INPUTBATT (with values) | Indicates input voltage, input frequency, PV voltage, charger current (if PV in charging for 2.2KVA models), charger power, battery voltage. |
| 88 (setting programs) | Indicates the setting programs. |
| 8.8 (warning/fault codes) | Indicates the warning and fault codes. Flashing for warning, solid for fault. |
| OUTPUTBATTLOAD (with values) | Indicates output voltage, output frequency, load percent, load in VA, load in Watt and discharging current. |
| CHARGING (battery level) | Indicates battery level by 0-24%, 25-49%, 50-74% and 75-100% in battery mode and charging status in line mode. |
| OVER LOAD | Indicates overload. |
| Load Level (0-100%) | Indicates the load level by 0-24%, 25-49%, 50-74% and 75-100%. |
| Mains connection icon | Indicates unit connects to the mains. |
| PV panel connection icon | Indicates unit connects to the PV panel. |
| BYPASS | Indicates load is supplied by utility power. |
| Utility charger circuit icon | Indicates the utility charger circuit is working. |
| DC/AC inverter circuit icon | Indicates the DC/AC inverter circuit is working. |
| Mute icon | Indicates unit alarm is disabled. |
4.4 LCD Setting
After pressing and holding the ENTER button for 3 seconds, the unit will enter setting mode. Press "UP" or "DOWN" to select setting programs. Then, press "ENTER" to confirm the selection or ESC to exit.
Detailed LCD setting programs are available in the full user manual PDF. Key settings include:
- Output source priority (SUB, SBU)
- Maximum charging current
- AC input voltage range (APL, UPS)
- Power saving mode enable/disable
- Battery type (AGM, User-Defined, Flooded)
- Auto restart settings for overload and over temperature
- Output voltage and frequency
- Maximum utility charging current
- Voltage point back to utility/battery source
- Bulk charging voltage (C.V voltage)
- Floating charging voltage
- Low DC cut-off voltage
- Battery equalization settings
- Alarm control, auto return to default display screen, backlight control
- Beeps while primary source is interrupted
- Overload bypass
- Record Fault code
4.5 Display Setting
The LCD display information can be switched by pressing the "UP" or "DOWN" key. Selectable information includes: input voltage, input frequency, PV voltage, charging current, PV power, battery voltage, output voltage, output frequency, load percentage, load in Watt, load in VA, DC discharging current, and CPU Version.
4.6 Operating Mode Description
The inverter operates in various modes, each with specific characteristics:
- Standby Mode / Power Saving Mode: The inverter is not turned on yet but can charge the battery without AC output. In power saving mode, the inverter output will be off when the connected load is very low or not detected.
- Line Mode: The unit provides output power from the mains and charges the battery.
- Battery Mode: The unit provides output power from the battery and PV power.
- Fault Mode: Errors are caused by internal circuit issues or external reasons such as over temperature or output short circuits.
4.7 Battery Equalization Description
The equalization function reverses the buildup of negative chemical effects like stratification and helps remove sulfate crystals from battery plates, optimizing battery performance and lifespan. It is recommended to equalize the battery periodically.
How to Apply Equalization Function:
- Enable battery equalization function in monitoring LCD setting program 33.
- Ensure program 5 is set to user-defined or flooded mode.
- Set equalization parameters in programs 34 to 37 based on battery requirements.
- Activate equalization immediately in program 39.
The equalization process involves Bulk, Absorption, Float, and Equalize stages, with specific voltage and time parameters to ensure proper battery charging and maintenance.
5. Maintenance
5.1 Clearance and Maintenance for Anti-Dust Kit (Optional)
Every inverter is installed with an anti-dust kit from the factory. This kit helps keep dust out and increases product reliability. The anti-dust kit should be cleaned from dust every one month.
- Remove the screws holding the dustproof case.
- Remove the dustproof case and take out the air filter foam.
- Clean the air filter foam and dustproof case. After cleaning, re-assemble the dust-kit back to the inverter.
6. Troubleshooting
6.1 Fault Reference Code
If a fault occurs, the inverter will display a fault code. Refer to the table below for common fault codes and their descriptions:
| Fault Code | Fault Event | What to do |
|---|---|---|
| 01 | Fan is locked when inverter is off | Replace the fan. |
| 02 | Over temperature (internal converter component is over 100°C) | Check whether air flow is blocked or ambient temperature is too high. |
| 03 | Battery voltage is too high / over-charged | Check battery specifications and quantity. Return to repair center if issue persists. |
| 04 | Battery voltage is too low (<1.4V/Cell) | Re-charge or replace battery. Contact repair center if internal fuse tripped. |
| 05 | Output short circuited or over temperature detected by internal converter components (over 120°C) | Check wiring, remove abnormal load. |
| 06 / 58 | Output voltage is too high / abnormal (below 190Vac or higher than 260Vac) | Reduce connected load. Return to repair center. |
| 07 | Overload time out (inverter overload 110% and time is up) | Reduce the connected load by switching off some equipment. |
| 08 / 09 / 53 / 57 | Bus voltage is too high / Bus soft start failed / Inverter soft start failed / Current sensor failed | Return to repair center. |
| 11 | Main relay failed | Return to repair center. |
| 13 | Solar charger stops due to high PV voltage | Check PV input voltage. |
| 51 | Over current or surge | Restart the unit. If error happens again, return to repair center. |
| 52 | Bus voltage is too low | Restart the unit. If error happens again, return to repair center. |
| 55 | Over DC voltage in AC output | Restart the unit. If error happens again, return to repair center. |
6.2 Warning Indicator
The inverter provides audible alarms and flashing icons for warning conditions:
| Warning Code | Warning Event | Audible Alarm | Icon flashing |
|---|---|---|---|
| 01 | Fan is locked when inverter is on. | Beep three times every second | Fan icon |
| 03 | Battery is over-charged | Beep once every second | Battery icon |
| 04 | Low battery | Beep once every second | Battery icon |
| 07 | Overload | Beep once every 0.5 second | Overload icon |
| 10 | Output power derating | Beep twice every 3 seconds | Output icon |
7. Specifications
7.1 Line Mode Specifications
| INVERTER MODEL | 2.2KVA-12V | 3.2KVA-24V |
|---|---|---|
| Input Voltage Waveform | Sinusoidal (utility or generator) | |
| Nominal Input Voltage | 230Vac | |
| Low Loss Voltage | 170Vac±7V (UPS); 90Vac±7V (Appliances) | |
| Low Loss Return Voltage | 180Vac±7V (UPS); 100Vac±7V (Appliances) | |
| High Loss Voltage | 280Vac±7V | |
| High Loss Return Voltage | 270Vac±7V | |
| Max AC Input Voltage | 300Vac | |
| Nominal Input Frequency | 50Hz / 60Hz (Auto detection) | |
| Low Loss Frequency | 40±1Hz | |
| Low Loss Return Frequency | 42±1Hz | |
| High Loss Frequency | 65±1Hz | |
| High Loss Return Frequency | 63±1Hz | |
| Output Short Circuit Protection | Circuit Breaker | |
| Efficiency (Line Mode) | >95% (Rated R load, battery full charged) | |
| Transfer Time | 10ms typical (UPS); 20ms typical (Appliances) | |
7.2 Inverter Mode Specifications
| INVERTER MODEL | 2.2KVA-12V | 3.2KVA-24V |
|---|---|---|
| Rated Output Power | 2200VA/1800W | 3200VA/3000W |
| Output Voltage Waveform | Pure Sine Wave | |
| Output Voltage Regulation | 230Vac±5% | |
| Output Frequency | 50Hz | |
| Peak Efficiency | 94% | |
| Overload Protection | 5s@ 150% load; 10s@ 110% ~ 150% load | |
| Surge Capacity | 2* rated power for 5 seconds | |
| Nominal DC Input Voltage | 12Vdc | 24Vdc |
| Cold Start Voltage | 11.5Vdc | 23.0Vdc |
| Low DC Warning Voltage @ load < 50% | 11.0Vdc | 22.0Vdc |
| Low DC Warning Voltage @ load ≥ 50% | 10.5Vdc | 21.0Vdc |
| Low DC Warning Return Voltage @ load < 50% | 11.5Vdc | 22.5Vdc |
| Low DC Warning Return Voltage @ load ≥ 50% | 11.0Vdc | 22.0Vdc |
| Low DC Cut-off Voltage @ load < 50% | 10.2Vdc | 20.5Vdc |
| Low DC Cut-off Voltage @ load ≥ 50% | 9.6Vdc | 20.0Vdc |
| High DC Recovery Voltage | 14.5Vdc | 29Vdc |
| High DC Cut-off Voltage | 15.5Vdc | 31Vdc |
| No Load Power Consumption | <25W | <35W |
7.3 Charge Mode Specifications
Utility Charging Mode
| INVERTER MODEL | 2.2KVA-12V | 3.2KVA-24V |
|---|---|---|
| Charging Algorithm | 3-Step | |
| AC Charging Current (Max) | 60Amp (@VI/P= 230Vac) | 60Amp (@VI/P= 230Vac) |
| Bulk Charging Voltage (Flooded Battery) | 14.6 | 29.2 |
| Bulk Charging Voltage (AGM / Gel Battery) | 14.1 | 28.2 |
| Floating Charging Voltage | 13.5Vdc | 27Vdc |
MPPT Solar Charging Mode
| INVERTER MODEL | 2.2KVA-12V | 3.2KVA-24V |
|---|---|---|
| Max. PV Array Power | 2000W | 3000W |
| Nominal PV Voltage | 240Vdc | |
| PV Array MPPT Voltage Range | 55~430Vdc | |
| Max. PV Array Open Circuit Voltage | 450Vdc | |
| Max Charging Current (AC charger plus solar charger) | 80Amp | |
7.4 General Specifications
| INVERTER MODEL | 2.2KVA-12V | 3.2KVA-24V |
|---|---|---|
| Safety Certification | CE | |
| Operating Temperature Range | -10°C to 50°C | |
| Storage Temperature | -15°C~60°C | |
| Humidity | 5% to 95% Relative Humidity (Non-condensing) | |
| Dimension (D*W*H), mm | 348*282*105mm | |
| Net Weight, kg | 5.0 | 5.5 |
8. User Tips
- Ensure all connections are tight and correct polarity is observed to prevent damage and ensure safe operation.
- Regularly check the LCD display for any warning or fault codes and address them promptly using the troubleshooting guide.
- Keep the inverter's ventilation clear and ensure adequate air circulation to prevent overheating, especially in warmer climates.
- For optimal battery life, utilize the battery equalization function periodically, especially if using lead-acid batteries.
- Consider the optional WiFi module for remote monitoring and control, which can enhance system management.
9. Warranty and Support
This product comes with a manufacturer's warranty. For detailed warranty terms, conditions, and support information, please refer to the official user manual PDF or contact your local dealer or service center.
The complete user manual, including detailed LCD setting programs and further technical information, can be found in the PDF document: EASUN 2.2KVA/3.2KVA Inverter / MPPT SCC / AC Charger User Manual (PDF).