1. Introduction
This manual provides essential information for the installation, operation, and maintenance of your EASUN Hybrid Solar Inverter. These inverters are designed to provide reliable power for your home by integrating solar power, utility power, and battery power. Please read this manual thoroughly before installation and use to ensure optimal performance and safety.
Figure 1: EASUN Hybrid Solar Inverter (4.2KW model shown)
2. Safety Information
- 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 approx. 20 cm to the side and approx. 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.
WARNING: SUITABLE FOR MOUNTING ON CONCRETE OR OTHER NON-COMBUSTIBLE SURFACE ONLY.
3. Product Overview and Features
The EASUN Hybrid Solar Inverter is a multi-functional device combining the functions of an inverter, solar charger, and battery charger to offer uninterruptible power support with a portable size. Its comprehensive LCD display provides user-configurable and easy-accessible button operations such as battery charging current, AC/solar charger priority, and acceptable input voltage based on different applications.
Key Features:
- Pure Sine Wave Hybrid Solar Inverter
- Output power factor 1.0
- Built-in MPPT Solar Charge Controller (120A for 4.2KW/6.2KW models, 80A for 2.2KW/3.2KW models)
- High PV input voltage range (60~500VDC for SMH-III, 90~430VDC for SMH-II)
- Inverter can run without battery (SMH-III models, if PV input > 160V)
- Built-in Lithium battery automatic activation
- Dual communication ports for Battery communication and WiFi communication
- Built-in anti-dust kit for harsh environments
- Smart battery charge design to optimize battery life
- WiFi & GPRS available for iOS and Android monitoring
- Dual output (SMH-III models)
- Protection against overload, overtemperature, and short circuit
- Auto restart during AC recovery
- Cold start function
Figure 2: Inverter Features Overview
LCD Display and Controls:
Figure 3: Product Overview with LCD Display and Controls
LED Indicators:
| LED Indicator | LED Status | 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 Keys:
| 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. Specifications
Figure 4: Detailed Specifications for EASUN Hybrid Solar Inverter Models
| Feature | SMH-III-6.2KW | SMH-III-4.2KW | SMH-II-3.2KW | SMH-II-2.2KW |
|---|---|---|---|---|
| Rated Power | 6200VA/6200W | 4200VA/4200W | 3200VA/3000W | 2.2KVA/1.8KW |
| Parallel Capability | NO | |||
| Work without Battery | YES | NO | ||
| INPUT | ||||
| Voltage | 230Vac | |||
| Acceptable Voltage Range | 170-280VAC (for personal Computer); 90-280VAC (for Home Appliances) | |||
| Frequency Range | 50Hz/ 60Hz (Auto detection) | |||
| OUTPUT | ||||
| Nominal Voltage | 230VAC ± 5% | |||
| Output Type | Dual output | Single output | ||
| Surge power | 14000VA | 8000VA | 6400VA | 4400VA |
| Transfer Time | 10ms (for personal computers) / 20ms (for home appliances) | |||
| Wave form | Pure Sine Wave | |||
| BATTERY & AC CHARGER | ||||
| Battery Voltage | 48VDC | 24VDC | 24VDC | 12VDC |
| Floating Charge Voltage | 54VDC | 27VDC | 27VDC | 13.5VDC |
| Overcharge Protection | 61VDC | 31VDC | 31VDC | 15.5VDC |
| Maximum charge current | 80A | 80A | 60A | 60A |
| SOLAR CHARGER | ||||
| MAX.PV Array Power | 6500W | 6200W | 3000W | 2000W |
| MPPT Range & Operating Voltage | 60VDC ~ 500VDC | 90-430VDC | ||
| Maximum PV Array Open Circuit Voltage | 500VDC | 450VDC | ||
| Maximum Charging Current | 120A | 120A | 80A | 80A |
| Maximum Efficiency | 98% | |||
| PHYSICAL | ||||
| Dimension (D*W*H mm) | 330*334*423 | 405*286*98 | 405x286x98 | |
| Net Weight (kgs) | 10 | 9.5 | 5 | 4.5 |
| Communication Interface | RS485 + RS232/WIFI/GPRS | RS232/WIFI/GPRS | ||
| ENVIRONMENT | ||||
| Operating Temperature | -10℃ ~ 50℃ | |||
5. Installation and Setup
5.1 Mounting the Unit
Before selecting where to install, consider the following points:
- 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 approx. 20 cm to the side and approx. 50 cm above and below the unit.
- 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.
Figure 5: Mounting the Inverter
5.2 Rear Panel Connections
The rear panel of the inverter provides various connection ports for power input, output, and communication. Refer to the diagram below for identification:
Figure 6: Rear Panel Connections
- Power on/off switch
- AC input
- Main output
- Second output (available on SMH-III models)
- PV input
- Battery communication/RS-485 port
- WIFI communication/RS-232 port
- Battery input
5.3 Solar Panel (PV) Connection
When selecting proper PV modules, please be sure to consider the following parameters:
- Open circuit voltage (Voc) of PV modules not exceeds max. PV array open circuit voltage of inverter.
- Open circuit Voltage (Voc) of PV modules should be higher than min. battery voltage.
Connecting in series will increase the voltage. This voltage needs to be between our PV voltage range (60~450VDC for SMH-II models, 60~500VDC for SMH-III models). Please check the open circuit voltage of your solar panels first. Ensure the total power of solar panels does not exceed the maximum power of the inverter.
Figure 7: Solar Panel Connection Diagram
PV Connection Specifications (Example for iSolar SMH III 4.2KW WIFI):
| INVERTER MODEL | iSolar SMH III 4.2KW WIFI |
|---|---|
| Maximum output power | 6200W |
| Maximum PV open circuit voltage | 500VDC |
| Maximum charge current | 120A |
| 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 |
| Max.PV module numbers in series | 12 x 36V ≤60~450VDC |
| PV module numbers in parallel | 12 x 8.3 < 120A |
| Total PV module numbers | 12 x 2 = 24 |
5.4 Battery Connection
Ensure correct battery voltage for your inverter model. The 4.2KW model supports a 24VDC system, while the 6.2KW model supports a 48VDC system. Connect batteries in series or parallel as required to achieve the correct voltage and capacity.
Figure 8: Battery Connection Diagrams
5.5 System Diagram
The inverter can operate in various modes depending on the availability of solar power, AC utility power, and battery connection. The diagrams below illustrate common system configurations and operation scenarios.
Figure 9: General System Diagram
Figure 10: System Operation Scenarios
- Operation with battery connected: The inverter can seamlessly switch between solar, battery, and utility power to supply home appliances.
- Operation without battery connected: For SMH-III models, the inverter can supply power directly from solar panels or utility grid.
6. Operation
6.1 Pure Sine Wave Output
The EASUN Hybrid Solar Inverter provides a pure sine wave output, which is identical to the waveform of the grid. This ensures high-quality AC power with higher efficiency, stable output, and high compatibility with various loads, including sensitive electronics.
Figure 11: Pure Sine Wave Output and Compatible Appliances
6.2 Monitoring and Control via SmartESS App
The inverter supports WiFi and GPRS communication, allowing you to monitor and control your system remotely using the SmartESS App on iOS and Android devices. To enable WiFi monitoring, ensure option 05 on the inverter's LCD settings is set to "USING", then connect the WiFi module.
Figure 12: SmartESS App Monitoring
7. Maintenance
To ensure the longevity and optimal performance of your EASUN Hybrid Solar Inverter, regular maintenance is recommended:
- Keep the inverter clean and free from dust. The built-in anti-dust kit helps, but periodic external cleaning is beneficial.
- Ensure proper ventilation around the unit to prevent overheating. Regularly check that air vents are not blocked.
- Periodically inspect all wiring connections for tightness and signs of corrosion.
- Monitor the LCD display for any warning or fault indicators and address them promptly.
8. Troubleshooting
If you encounter issues with your inverter, refer to the LED indicators and LCD display for diagnostic messages. Common issues and general troubleshooting steps are provided below:
Common Issues:
- No Power: Check the power on/off switch, AC input connection, and battery connection. Ensure batteries are charged.
- Fault Indicator (Red Solid On): A fault has occurred. Refer to the inverter's specific fault codes (if available in the full manual) or contact support.
- Warning Indicator (Red Flashing): A warning condition exists. This could be due to high temperature, low battery voltage, or other non-critical issues. Check environmental conditions and battery status.
- No Solar Charging: Verify PV panel connections, ensure PV voltage is within the MPPT operating range, and check for shading on panels.
- Inverter Not Supplying Load: Check if the load exceeds the inverter's rated power or surge power. Ensure batteries are adequately charged if operating in battery mode.
For detailed troubleshooting, consult the complete user manual or contact EASUN POWER customer support.
9. User Tips
- Battery-less Operation: The SMH-III 4.2KW model can operate without batteries, but ensure the PV input voltage exceeds at least 160V for stable operation. SMH-II 3.2KW and 2.2KW models require a connected battery to function.
- WiFi Monitoring: Remember to set option 05 on the LCD display to "USING" to enable WiFi monitoring via the SmartESS App.
- Optimizing Battery Life: Utilize the intelligent battery charger design by configuring settings via the LCD to match your battery type and usage patterns for extended battery lifespan.
10. Warranty and Support
EASUN POWER products come with a warranty to ensure your peace of mind:
Figure 13: Warranty Information
- All EASUN inverters have a 12-month warranty from the store.
- Lithium-substituted lead batteries have a 36-month warranty.
- Wall-mounted batteries have a 10-year warranty.
For technical support, warranty claims, or any inquiries, please contact EASUN POWER customer service through your purchase channel.
11. Product Unboxing Video
Watch this video for an unboxing and initial overview of the EASUN iSolar SMH II 4.2/7KW model, highlighting its MPPT charge controller and high voltage PV array capabilities.
Video 1: Unboxing the EASUN iSolar SMH II 4.2/7KW Inverter