EASUN POWLAND Hybrid Solar Inverter SMH-II Series Instruction Manual

1. Introduction

The EASUN POWLAND Hybrid Solar Inverter is a versatile multi-function device that integrates an inverter, solar charger, and battery charger into a compact unit. It is designed to provide uninterruptible power support for various applications, from home appliances to personal computers. The inverter features a comprehensive LCD display for user-configurable settings, including battery charging current, AC/solar charger priority, and acceptable input voltage ranges.

This manual provides essential information for the safe and efficient operation of your SMH-II series hybrid solar inverter. Please read it thoroughly before installation and use.

2. Safety Instructions

Please observe all safety warnings and instructions in this manual. Improper installation or use may result in electric shock, fire, or serious injury.

• Ensure proper grounding of the inverter.
• Do not attempt to disassemble or repair the inverter yourself. Refer to qualified service personnel.
• Install the inverter in a well-ventilated area, away from flammable materials and direct sunlight.
• Ensure all wiring connections are tight and secure to prevent loose connections and overheating.
• Wear appropriate personal protective equipment (PPE) during installation, including insulated gloves and eye protection.
• Verify correct battery polarity before connecting to the inverter.
• Do not connect the battery after the utility is turned on.

3. Product Overview

The inverter features a user-friendly LCD display and various connection ports for seamless integration into your solar power system.

3.1. Front Panel and LCD Display

The LCD display provides real-time information about the system status, including input/output voltage, battery status, and power flow. The function keys allow for navigation and configuration of various settings.

3.2. Connection Ports

1. RS-232 Communication port
2. Power on/off switch
3. AC input
4. AC output
5. PV input
6. Battery input
7. Safety (Earth) ground

4. Installation and Setup

Before proceeding with installation, ensure the inverter is placed in a suitable environment as described in the safety instructions. All connections must be made by a qualified electrician.

4.1. Wiring Diagram

4.2. Step-by-Step Installation Guide

Watch the video below for a visual guide on connecting the inverter components.

1. **Prepare the Inverter:** Unscrew and remove the terminal cover from the bottom of the inverter.
2. **Battery Connection:** Connect the positive (red) and negative (black) battery cables to the corresponding terminals on the inverter (labeled "BATTERY +", "BATTERY -"). Ensure connections are tight.
3. **Ground Connection:** Connect the ground wire (green/yellow) to the ground terminal on the inverter.
4. **AC Output Connections:** Connect the AC output wires (e.g., red for live, blue for neutral, green/yellow for ground) to the AC output terminals.
5. **AC Input Connections:** Connect the AC input wires (e.g., red for live, blue for neutral, green/yellow for ground) to the AC input terminals.
6. **PV Connection:** Connect the positive and negative cables from your solar panels to the PV input terminals on the inverter. Ensure correct polarity.
7. **Turn on Battery and Inverter:** Turn on the battery switch (if applicable) and then the inverter's power switch.
8. **Connect Utility Power:** Plug the utility power cable into a wall outlet.
9. **Test Output:** Connect an appliance (e.g., a fan) to the inverter's output to verify proper operation.

**Important Note:** For 4.2KW and 6.2KW models, the inverter can operate without a battery. For 2.2KW and 3.2KW models, a battery is required for operation.

**PV Module Selection Considerations:**

• Open circuit Voltage (Voc) of PV modules must not exceed the maximum PV array open circuit voltage of the inverter.
• Open circuit Voltage (Voc) of PV modules should be higher than the minimum battery voltage.

**Optional WiFi Monitoring:** The inverter supports WiFi/GPRS data acquisition for iOS and Android apps, but the module needs to be purchased separately.

5. Operating Instructions

The inverter provides a pure sine wave output, suitable for various sensitive electronics and home appliances. It offers programmable settings to optimize performance based on your specific needs.

• **Pure Sine Wave Output:** Provides high-quality AC power with higher efficiency, stable output, and high compatibility, capable of driving any kind of load without interference.
• **Programmable Supply Priority:** Configure AC/Solar input priority via the LCD settings to determine whether the inverter primarily uses solar power, utility power, or battery power.
• **Selectable Charging Current:** Adjust the battery charging current based on your battery type and capacity for optimized battery performance and longevity.
• **Auto Restart:** The inverter will automatically restart when AC power is restored after an interruption.
• **Cold Start Function:** Allows the inverter to start up directly from the battery without AC input.
• **Intelligent Fan Speed Adjustment:** The cooling fan speed adjusts automatically based on the inverter's temperature to maintain optimal operating conditions and reduce noise.

6. Maintenance

Regular maintenance ensures the longevity and optimal performance of your inverter.

• **Cleaning:** Periodically clean the exterior of the inverter with a dry cloth. Ensure ventilation openings are free from dust and debris.
• **Connections:** Regularly check all electrical connections (battery, PV, AC input/output, ground) for tightness and corrosion. Tighten any loose connections.
• **Battery Inspection:** If using lead-acid batteries, check electrolyte levels and terminal conditions as per battery manufacturer guidelines. For lithium batteries, monitor their state of charge and health via the inverter's display or connected monitoring system.
• **Environment:** Ensure the installation environment remains within the specified temperature and humidity ranges.

7. Troubleshooting

This section addresses common issues you might encounter with your inverter.

Common Issues & Solutions:

• **Inverter not turning on:**
  • Check battery connections and ensure they are secure and correctly polarized.
  • Verify the battery voltage is within the acceptable range for the inverter.
  • Ensure the inverter's power switch is in the "ON" position.
• **No AC output:**
  • Check AC output wiring for loose connections or breaks.
  • Verify that the inverter is not in fault mode (check FAULT LED).
  • Ensure the load connected does not exceed the inverter's rated power.
• **Battery not charging:**
  • Check PV panel connections and ensure they are receiving sufficient sunlight.
  • Verify PV input voltage is within the MPPT operating range.
  • Check AC input connection if charging from utility.
  • Ensure battery charging current settings are configured correctly.
• **Overload/Short Circuit Protection:** The inverter will automatically shut down to protect itself. Reduce the load or clear the short circuit, then restart the inverter.

8. Specifications

Detailed technical specifications for the SMH-II series hybrid solar inverters.

9. User Tips

• **Battery-less Operation:** The 4.2KW and 6.2KW models of this inverter series are capable of operating without a connected battery, directly utilizing solar or utility power. The 2.2KW and 3.2KW models require a battery for operation.
• **Power Mixing:** This inverter supports configurable AC/Solar input priority, allowing you to decide whether to prioritize solar power, utility power, or battery power for your loads. This enables efficient management of energy sources.
• **Voltage Compatibility:** The inverter is designed for 230VAC input/output. Ensure your grid and appliances are compatible with this voltage.
• **Lithium Battery Compatibility:** The inverter is compatible with lithium-ion batteries and supports BMS communication for optimized battery life and performance.

10. Warranty and Support

For warranty information, technical support, or service inquiries, please contact your original point of purchase or the manufacturer's authorized service center. Keep your purchase receipt as proof of purchase.