1. Introduction
This manual provides instructions for the assembly, installation, operation, and troubleshooting of the EASUN POWER 3.2KW Hybrid Solar Inverter. Please read this manual carefully before installation and operation to ensure safe and efficient use.
The EASUN POWER Hybrid Solar Inverter is a multifunctional off-grid solar inverter that integrates an MPPT solar charging controller, a high-frequency pure sine wave inverter, and a UPS function module. It is designed for off-grid backup power supply and self-consumption systems. Its high-frequency transformer design ensures reliable power conversion in a compact size. This inverter can also operate in battery-free mode.
For complete system operation, additional equipment such as photovoltaic modules, a generator, or a utility grid may be required. A WiFi module is available as an optional plug-and-play monitoring device, allowing users to monitor the solar system's status via mobile phones or websites.
1.1. Key Features
- Pure sine wave output 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.
- Automatic restart while AC is recovering.
- Overload, over temperature, and short circuit protection.
- Smart battery charger design for optimized battery performance.
- Cold start function.
- Intelligent fan speed adjustment based on temperature, load, and charging current.
- Built-in MPPT with an operating voltage range of 55V-430V and an open circuit voltage of 450Voc.
- WIFI/GPRS remote monitoring (optional).
1.2. Basic System Architecture
The diagram below illustrates a basic application for this inverter/charger. It shows how the inverter integrates with solar power, a generator or utility grid, and battery packs to power various home appliances.
2. Safety Regulations
Warning: This article contains important safety and operation instructions. Please read and save this manual for future reference.
- Always choose the corresponding battery setting (lead-acid or lithium) carefully. Incorrect settings can lead to system malfunction.
- Before using the unit, read all instructions and cautions on the unit and understand all battery models and relevant chapters in this manual.
- Never short-circuit AC output and DC input. Do not connect to mains when DC input is short-circuited.
- Never charge a non-rechargeable battery.
- Do not disassemble the unit. For maintenance or repair, send it to a professional technical service center. Incorrect reassembly can cause electric shock or fire.
- To reduce the risk of electric shock, disconnect all wiring before any maintenance or cleaning. Turning off the device alone does not eliminate this risk.
- Exercise extreme caution when using metal tools near the battery. Sparks from falling tools can cause short circuits or explosions.
- For optimal operation, select the appropriate cable size for the off-grid solar inverter as instructed.
- When disconnecting AC or DC terminals, strictly follow the installation procedure outlined in this manual.
- Ensure the off-grid solar inverter is connected to a permanent grounding wiring system, complying with local requirements and regulations.
- Provide a fuse with specified ratings for battery power supply overcurrent protection.
- Warning: Only professional service personnel can repair this equipment. If errors persist after troubleshooting, return the inverter to the local dealer or service center.
3. Product Overview
The inverter features an LCD screen, status indicators, charging indicators, fault indicators, and function keys for easy operation and monitoring.
3.1. Components
- LCD screen
- Status indicator
- Charging indicator
- Fault indicator
- Function keys (ESC, UP, DOWN, ENTER)
- Power on/off switch
- AC input
- AC output
- PV input
- Battery input
- RS232/RS485 communication port
- Ground wire terminal
- Circuit breaker
3.2. LED Indicator Messages
| 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. |
3.3. 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. Setup and Installation
4.1. Unpacking and Inspection
Upon receiving your inverter, carefully unpack it and inspect for any damage. The package should contain:
- Hybrid Solar Inverter unit x 1
- User manual x 1
- Accessories (e.g., communication cable, mounting screws)
4.2. Preparation Before Installation
Before connecting any wiring, remove the bottom cover of the inverter by unscrewing the two retaining screws.
4.3. Mounting the Unit
Consider the following points when selecting an installation location:
- Do not mount the inverter on flammable construction materials.
- Mount on a solid surface.
- Install the inverter at eye level for easy LCD display readability.
- Ensure proper air circulation and heat dissipation by leaving a clearance of approximately 20 cm to the sides and 50 cm above and below the unit.
- The ambient temperature should be between 0°C and 55°C for optimal operation.
- The recommended installation position is vertically against a wall, with some space from the ground.
Suitable for mounting on concrete or other non-combustible surfaces only.
Tighten the screws to fix the installation. M4 or M5 screws are recommended for machine fixing.
4.4. Battery Connection
Warning: All wiring must be performed by qualified personnel. It is crucial for system safety and efficient operation to use appropriate cables for battery connection. To reduce the risk of injury, use the proper recommended cable sizes.
Lead-Acid Battery Connection:
- Install an independent DC overcurrent protector or disconnect device between the battery and the inverter.
- Connect the battery according to the recommended battery cable specifications (e.g., 1*6 AWG for 3.2KVA-24V).
- Insert the ring terminal of the battery cable into the inverter's battery connector and tighten the bolts to 2-3 Nm. Ensure correct polarity.
Lithium Battery Connection:
Only lithium batteries matched with BMS communication protocol are allowed.
- Connect the battery according to recommended battery cable specifications.
- Insert the ring terminal of the battery cable into the inverter's battery connector and tighten the bolts to 2-3 Nm. Ensure correct polarity.
- Connect one side of the RJ45 cable to the BMS communication port of the inverter.
- Insert the other side of the RJ45 cable into the RS485 communication port on the lithium battery.
- If using a lithium battery, ensure the battery and inverter are connected with a BMS communication cable and select