1. Introduction
This manual provides essential information for the safe and efficient operation of your EASUN POWER 4000W Solar Inverter. Please read it thoroughly before installation and use. This hybrid solar inverter features a built-in MPPT 100A charger, supports up to 500VDC PV voltage, and provides a pure sine wave output at 230V, 50/60Hz for 24V battery off-grid systems.
Figure 1: EASUN POWER 4000W Solar Inverter Overview
2. Product Features
- Lithium battery activation function via PV or Utility.
- Compatible with LiFePO4 batteries via RS485 communication.
- Pure sine wave output.
- PV input voltage range: 60VDC - 500VDC.
- Built-in MPPT 100A charger.
- Capable of working without a battery (for 3.2KW and 4KW models, provided PV voltage is >200V).
- Detachable dust cover for harsh environments.
- Optional WiFi remote monitoring.
- Supports multiple output priorities: UTL (Utility), SOL (Solar), SBU (Solar-Battery-Utility), SUB (Solar-Utility-Battery).
- EQ function to optimize battery performance and extend lifecycle.
3. Setup and Installation
3.1. 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.
- 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.
Figure 2: Inverter Mounting Diagram with Clearances
SUITABLE FOR MOUNTING ON CONCRETE OR OTHER NON-COMBUSTIBLE SURFACE ONLY.
3.2. Wiring Connections
Refer to the following diagrams and video for proper wiring. Ensure all connections are secure before powering on the unit.
Video 1: Installation Guide for EASUN POWER Solar Inverter, demonstrating battery, AC, PV, and WiFi connections.
3.2.1. Rear Panel Overview
Figure 3: Inverter Rear Panel Connections
3.2.2. Battery Connection
The 4KW model supports a 24VDC system. Connect the positive and negative battery terminals as shown.
Figure 4: 24VDC Battery Connection Diagram
3.2.3. PV Connection
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 (500VDC).
- Open circuit Voltage (Voc) of PV modules should be higher than the minimum battery voltage.
Figure 5: PV Connection Guidelines and Specifications
3.2.4. System Diagram
The inverter can operate with various power sources and loads as depicted in the system diagram below.
Figure 6: Inverter System Diagram (Operation with battery connected)
4. Operating Instructions
4.1. Product Overview and Controls
The inverter features an LCD display, function keys, and LED indicators for monitoring and control.
Figure 7: Inverter Product Overview and Controls
4.1.1. LED Indicators
| LED Indicator | Messages |
|---|---|
| AC / INV (Green) | Solid On: Output is powered by utility in Line mode. Flashing: 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. |
4.1.2. Function Keys
| Function Keys | 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 |
4.2. LCD Display Information
If communication between the inverter and battery is successful, various information will be shown on the LCD.
Figure 8: LCD Display Details
5. Maintenance
- Regularly inspect all wiring connections to ensure they are tight and free from corrosion.
- Keep the inverter's ventilation openings clear of dust and debris. The detachable dust cover can be removed for cleaning in harsh environments.
- Periodically check the battery terminals for any signs of wear or damage.
- Ensure the inverter is installed in a well-ventilated area to prevent overheating.
- For optimal battery performance and extended lifecycle, utilize the EQ (Equalization) function as needed, referring to the battery manufacturer's recommendations.
6. Troubleshooting
The inverter provides warning indicators to help diagnose issues. Refer to the table below for common warning codes and their descriptions.
Figure 9: Warning Indicator Table
If a fault occurs that is not listed or cannot be resolved, please contact customer support.
7. Specifications
Detailed technical specifications for the EASUN POWER 4000W Solar Inverter (ISolar-SMG-II-4KW-24V WiFi model):
| Category | Parameter | Value |
|---|---|---|
| General | Model Number | ISolar-SMG-II-4KW |
| Rated Power | 3500W (4000VA/4KW) | |
| Output Current | 15.6A | |
| Output Type | SINGLE | |
| Certification | CE (IEC 62109-1), EN61000, C2 | |
| Input (AC) | Nominal Voltage | 230VAC |
| Acceptable Voltage Range | 170-280VAC (Personal Computer); 90-280VAC (Home Appliances) | |
| Frequency | 50/60 Hz (Auto sensing) | |
| Output (AC) | Nominal Voltage | 220/230VAC ±5% |
| Surge Power | 7000VA | |
| Frequency | 50/60Hz | |
| Waveform | Pure Sine wave | |
| Peak Efficiency (PV to INV) | 96% | |
| Peak Efficiency (Battery to INV) | 93% | |
| Battery | Battery Voltage | 24V (Minimum starting voltage 22V) |
| Floating Charge Voltage | 27VDC | |
| OverCharge Protection | 33VDC | |
| Charging Method | CC/CV | |
| Solar & AC Charger | Solar Charger Type | MPPT |
| Max. PV Array Power | 4000W | |
| Max. PV Array Open Circuit Voltage | 500VDC | |
| PV Array MPPT Voltage Range | 60VDC ~ 500VDC | |
| Maximum Charge Current (PV+AC) | 100A | |
| Physical | Dimensions (D x W x H) | 358mm x 295mm x 100mm |
| Weight | 8KG | |
| Ingress Protection | IP21 (Indoor use) | |
| Communication Interface | RS232 + RS485 | |
| Environment | Operating Temperature Range | -10°C to 50°C |
| Storage Temperature | -15°C to 50°C | |
| Humidity Range | 5% to 95% Relative Humidity (Non-condensing) |
8. User Tips
- Battery-less Operation: The 4KW model is capable of working without a battery, provided the PV voltage is greater than 200VDC. This can be useful for direct solar power to loads during daylight hours.
- LiFePO4 Compatibility: The inverter supports LiFePO4 batteries and can communicate via RS485 for optimized performance.
- Remote Monitoring: Consider utilizing the optional WiFi remote monitoring feature for convenient system oversight and data logging.
9. Warranty and Support
For warranty information, technical support, or service inquiries, please refer to the documentation provided by your seller or contact EASUN POWER customer service directly. Ensure you have your product model number and purchase details available when seeking support.