DEWIN 500W Grid Tie Inverter User Manual

1. Introduction

This manual provides detailed instructions for the installation, operation, and maintenance of your DEWIN 500W Grid Tie Inverter. This device is designed to convert direct current (DC) from solar photovoltaic (PV) panels or batteries into alternating current (AC) for direct use in your home or to feed into the electrical grid. Please read this manual thoroughly before use to ensure safe and efficient operation.

Figure 1: DEWIN 500W Grid Tie Inverter and included AC output cable.

2. Key Features

The DEWIN 500W Grid Tie Inverter incorporates advanced technology for optimal performance:

• Innovative MPPT Design: Features an optimized integrated speed and an improved Maximum Power Point Tracking (MPPT) algorithm. A high-speed main control chip and power supply ensure precise sunlight capture and power output, enhancing output power efficiency up to 99%.
• New Working Mode Switch: Includes a dedicated switch for solar panel and battery working modes, ensuring independent operation. A knob switch allows free adjustment of output power between 30W and 250W.
• Versatile DC Source Support: Compatible with various DC sources, including all types of photovoltaic modules (within the start voltage range) and different battery power sources such as lead-acid batteries, solid-state batteries, and lithium batteries. This flexibility allows for energy saving and recycling in diverse scenarios.
• Multiple Protection Measures: Equipped with comprehensive safety features including DC overvoltage/overcurrent protection, AC overvoltage/overcurrent/overfrequency protection, overtemperature protection, and islanding protection.
• Wide Application Scenarios: This photovoltaic panel and battery dual-purpose inverter is suitable for grid-connected power generation. It can be connected to photovoltaic panels for power generation or to batteries (lead-acid, lithium), communication switching power supplies, test power supply equipment, and high-power LED drive power aging for grid connection.

Figure 2: Inverter highlighting various protection features.

Figure 3: Diagram illustrating the High Frequency Isolation Technology and pure sine wave output.

3. Package Contents

Please check the package for the following items:

• 1 x DEWIN 500W Grid Tie Inverter
• 1 x AC Output Cable
• 1 x User Manual

4. Technical Specifications

Figure 4: Inverter dimensions (223mm x 145mm x 55mm).

5. Safety Precautions

WARNING: Improper installation or operation can lead to serious injury or damage to the equipment. Always follow these safety guidelines:

• Ensure all connections are secure and correct before powering on the inverter.
• Do not exceed the maximum input voltage or current ratings.
• Only qualified personnel should perform electrical installations.
• Keep the inverter away from water, moisture, and flammable materials.
• Ensure adequate ventilation around the inverter to prevent overheating.
• Do not attempt to open or repair the inverter yourself. Contact customer support for assistance.
• Always disconnect power before performing any maintenance or troubleshooting.

6. Setup and Installation

Follow these steps to install your DEWIN Grid Tie Inverter:

6.1 Choosing a Location

Select a cool, dry, and well-ventilated location for the inverter. Ensure it is protected from direct sunlight, rain, and dust. Allow sufficient space around the unit for airflow.

6.2 Connecting to Solar Panels (PV Mode)

1. Ensure your solar panels' voltage (Vmp: 18-21V, Voc: 20-24V) is within the inverter's acceptable input range.
2. Connect the positive (+) and negative (-) terminals of your solar panel array to the corresponding DC INPUT terminals on the inverter. Ensure polarity is correct.
3. Connect the AC OUTPUT of the inverter to a standard indoor grid AC outlet using the provided AC output cable.
4. Set the working mode switch (labeled 'START' on the inverter) to the 'PV' position (usually indicated by a sun icon or 'PU').

Figure 5: Connection diagram for solar panel operation.

6.3 Connecting to Batteries (BAT Mode)

The inverter supports various 12V battery types (lead-acid, solid-state, lithium).

1. Connect the positive (+) and negative (-) terminals of your 12V battery to the corresponding DC INPUT terminals on the inverter. Ensure correct polarity.
2. Connect the AC OUTPUT of the inverter to a standard indoor grid AC outlet using the provided AC output cable.
3. Set the working mode switch (labeled 'START' on the inverter) to the 'BAT' position (usually indicated by a battery icon).

6.4 Series and Parallel Connection of Solar Panels

The inverter can be used with solar panels connected in series or parallel, depending on your power requirements. Ensure the total voltage and current remain within the inverter's specifications.

Figure 6: Example of two 250W solar panels connected in series. In series connection, the voltage adds up while the current remains the same. For example, two 250W panels with Vmp 18V and Imp 13.8A would result in 36V and 13.8A.

Figure 7: Example of two 250W solar panels connected in parallel. In parallel connection, the current adds up while the voltage remains the same. For example, two 250W panels with Vmp 18V and Imp 13.8A would result in 18V and 27.6A.

7. Operating Instructions

7.1 Powering On and Mode Selection

After connecting the DC input and AC output, ensure the working mode switch is set to either 'PV' (for solar panels) or 'BAT' (for batteries) depending on your power source. The inverter will automatically begin operation.

7.2 Adjusting Output Power

The inverter features a knob switch (potentiometer) to adjust the output power freely between 30W and 250W. Rotate the knob clockwise to increase power and counter-clockwise to decrease it.

7.3 LED Indicators

The inverter has three LED indicators: POWER (green), APC (blue), and HEAT (red). These indicators provide real-time status information:

Figure 8: LED Status Indicators and their meanings.

8. Maintenance

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

• Cleaning: Periodically clean the exterior of the inverter with a dry, soft cloth. Do not use liquid cleaners or solvents.
• Ventilation: Ensure the cooling fins and fan vents are free from dust and obstructions. The inverter is equipped with smart cooling fans that activate when a certain temperature or power level is reached.
• Connection Check: Regularly inspect all electrical connections for tightness and signs of wear or corrosion.

Figure 9: Illustration of the smart cooling fans for efficient heat dissipation.

9. Troubleshooting

Refer to the LED indicators (Section 7.3) for initial diagnosis. Below are common issues and their potential solutions:

• No Power Output / POWER LED Off:
  - Check if the inverter is properly connected to the solar panel or battery.
  - Ensure the working mode switch is correctly set (PV or BAT).
  - Verify that the AC output cable is securely plugged into the grid outlet.
• POWER LED Flashing:
  - Indicates PV voltage or grid frequency is outside the acceptable range. Check your solar panel voltage or the stability of your grid connection.
• APC LED Off:
  - Input voltage may be outside the MPPT tracking range. Adjust the input source or check the solar panel/battery voltage.
• HEAT LED Flashing:
  - Inverter temperature is slightly high (>45°C). Ensure adequate ventilation and clear any obstructions from the cooling vents.
• HEAT LED Off (System Overheating):
  - If the HEAT LED is off and the system has shut down, it indicates overheating (>70°C). The inverter will automatically resume operation once the temperature drops below 45°C. Improve ventilation immediately.
• Low Power Output:
  - Check the adjustable power knob setting. Increase it if necessary.
  - Ensure solar panels are receiving sufficient sunlight or that the battery is adequately charged.

If the problem persists after attempting these solutions, please contact customer support.

10. Warranty and Customer Support

For warranty information, returns, or technical support, please refer to the purchase documentation or contact the seller directly. Keep your proof of purchase for any warranty claims.

Seller: Dewinshop

Amazon Store: DEWIN Store on Amazon