1. Introduction
The EASUN SMH Series Hybrid Solar Inverter is a versatile power solution designed to integrate solar power, utility power, and battery power to provide continuous energy supply. This manual provides essential information for the safe and efficient installation, operation, and maintenance of your inverter.
Key Features:
- Pure sine wave output for sensitive electronics.
- 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 monitoring and control (requires setting option 05 to "USE").
- Built-in 120A MPPT Solar charge controller.
- High PV input voltage range (55-450VDC or 60-500VDC depending on model).
- Built-in anti-dust kit for harsh environments.
- Dual communication ports for Battery Management System (BMS) and Wi-Fi communication.
- Dual output for SMH III 6.2KW and SMH III 4.2KW models.
Note: SMH III 6.2KW and SMH III 4.2KW models can operate without a battery. SMH II 3.2KW and SMH II 2.2KW models require a connected battery to function.
2. Safety Information
Please read and understand all instructions and warnings before installing, operating, or servicing this inverter. Failure to follow these instructions may result in electric shock, fire, or severe injury.
- Installation must be performed by qualified personnel.
- Ensure all connections are secure and correctly polarized.
- 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 approximately 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.
3. Product Overview
Front Panel: LCD Display and Controls
The front panel features an LCD display for monitoring system status and parameters, along with several function keys for navigation and settings adjustment.
LED Indicators and Messages:
| LED Indicator | Color | Description |
|---|---|---|
| AC / INV | Green | Solid On: Output is powered by utility in Line mode. Solid On: Output is powered by battery or PV in battery mode. |
| CHG | Green | Solid On: Battery is fully charged. Flashing: Battery is charging. |
| FAULT | Red | Solid On: Fault occurs in the inverter. 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 |
Rear Panel: Connections
- Power on/off switch
- AC input
- Main output
- Second output
- PV input
- Battery communication/RS-485 port
- WIFI communication/RS-232 port
- Battery input
4. Installation
4.1 Mounting the Unit
4.2 Wiring Connections
Refer to the installation video for a visual guide on wiring connections. Always ensure power is off before making any connections.
- Connect the positive and negative battery terminals: Ensure correct polarity.
- Connect the positive and negative PV terminals: Ensure correct polarity.
- Connect the positive and negative AC input terminals: Connect the AC input from the utility or generator.
- Connecting ground: Ensure proper grounding for safety.
- Turn on the battery and inverter switch: After all connections are secure, turn on the battery and inverter switches. Wait for the parameter display to initialize.
- Install WIFI: Connect the optional WIFI module to the designated port for remote monitoring.
4.3 Battery Connection Diagram
The 4.2KW model supports a 24VDC system, and the 6.2KW model supports a 48VDC system. Follow the diagrams carefully for correct battery bank configuration.
4.4 PV Connection Guidelines
When selecting proper PV modules, please be sure to consider the following 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.
Example PV Sizing (for iSolar SMH III 6.2KW WIFI):
| Parameter | Value | Calculation Example |
|---|---|---|
| Maximum output power | 6500W | |
| Maximum PV open circuit voltage | 500VDC | |
| Maximum charge current | 120A | |
| Maximum Power (Pmax) | 250W | Max.PV module numbers in series: 13 x 36V ≈60~450VDC |
| Max.Power Voltage Vmpp(V) | 36V | |
| Max.Power Current Impp(A) | 8.3A | PV module numbers in parallel: 13 x 8.3 = 120A |
| Open Circuit Voltage Voc(V) | 40V | Total PV module numbers: 13 |
| Short Circuit Isc(A) | 8.9A | 13 x 2 = 26 |
5. Operation
5.1 System Diagram
The inverter supports various operation modes:
- Operation without battery connected: The inverter can draw power from solar or AC utility/generator to supply home appliances.
- Operation with battery connected: The inverter can utilize solar, AC utility/generator, and battery power to supply home appliances, providing backup power.
5.2 Pure Sine Wave Output
The inverter provides a pure sine wave output, which is identical to the waveform of the utility grid. This ensures high-quality AC power with high efficiency, stable output, and broad compatibility with various loads, including sensitive electronics such as TVs, refrigerators, computers, and other household appliances.
5.3 Monitoring and Control via SMARTESS APP
The inverter can be monitored and controlled remotely using the SMARTESS app, available for both iOS and Android devices. Ensure the WIFI module is correctly installed and configured (set option 05 to "USE" on the inverter's LCD) to enable this feature.
6. Specifications
| Model | 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 | 120A | 120A | 80A | 80A |
| SOLAR CHARGER | ||||
| MAX.PV Array Power | 6500W | 6200W | 3000W | 2000W |
| MPPT Range&Operating Voltage | 60VDC~ 500VDC | 55-450VDC | ||
| Maximum PV Array Open Circuit Voltage | 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℃ | |||
7. Maintenance
Regular maintenance ensures the longevity and optimal performance of your EASUN Hybrid Solar Inverter.
- Cleaning: Periodically clean the inverter's exterior to prevent dust buildup, especially around ventilation openings. Use a dry, soft cloth. Do not use liquid cleaners.
- Connections Check: Annually inspect all wiring connections (battery, PV, AC input/output, ground) to ensure they are tight and free from corrosion.
- Ventilation: Ensure that the inverter's ventilation openings are not blocked and that there is adequate airflow around the unit as specified in the installation section.
- Environmental Conditions: Verify that the operating environment remains within the specified temperature and humidity ranges.
- Firmware Updates: Check the manufacturer's website or app for any available firmware updates to ensure your inverter has the latest features and bug fixes.
8. Troubleshooting
If you encounter issues with your inverter, refer to the LED indicator table in the Product Overview section for initial diagnosis. For persistent problems, consider the following general troubleshooting steps:
- No Power/Display: Check all power connections, including battery and AC input. Ensure the power switch is in the 'ON' position. Verify battery voltage is within the acceptable range.
- Fault/Warning LED: Consult the LED indicator table for the specific fault or warning message. This will guide you to the potential issue (e.g., overload, over temperature, short circuit).
- No Output Power: Check AC output connections. Ensure the inverter is not in a fault state. Verify that input power sources (PV, AC utility) are active.
- Battery Not Charging: Check PV input connections and voltage. Verify AC input is present if AC charging is enabled. Ensure battery charging settings are correctly configured via the LCD.
- WIFI Connection Issues: Ensure the WIFI module is correctly installed and the inverter's option 05 is set to "USE". Check your network settings and ensure the inverter is within range of your Wi-Fi router.
If the problem persists after these steps, contact customer support.
9. User Tips
- Battery-less Operation: Remember that only the SMH III 6.2KW and SMH III 4.2KW models can operate without a battery. The SMH II 3.2KW and 2.2KW models require a battery to function.
- Grid Interaction: This hybrid inverter is designed for off-grid or backup power applications. It primarily consumes power from solar or utility/battery to supply loads. For grid-injection capabilities (selling excess power back to the grid), a different type of inverter (grid-tie or advanced hybrid with grid-export features) would be required.
- WIFI Setup: After installing the WIFI module, ensure you navigate to the inverter's LCD settings and set option '05' to 'USE' to activate the WIFI functionality for app monitoring.
10. Warranty and Support
Your EASUN Hybrid Solar Inverter comes with a 1-year warranty from the date of purchase. This warranty covers manufacturing defects and malfunctions under normal use conditions.
For technical assistance, troubleshooting, or warranty claims, please contact your seller or the manufacturer's customer support. When contacting support, please have your product model and serial number available.
