1. Introduction
This manual provides essential information for the safe and efficient operation of your EF ECOFLOW DELTA Pro Solar Generator and 2x220W Portable Solar Panels. Please read this manual thoroughly before using the product to ensure proper setup, usage, and maintenance. Retain this manual for future reference.

Figure 1.1: EF ECOFLOW DELTA Pro Solar Generator with two 220W Portable Solar Panels.
2. Product Overview
2.1 Components
- DELTA Pro Portable Power Station: The main unit providing power output and battery storage.
- 220W Portable Solar Panels (x2): Foldable solar panels for recharging the DELTA Pro.
- Cables and Accessories: Necessary cables for charging and connecting devices.

Figure 2.1: The DELTA Pro Portable Power Station unit.

Figure 2.2: Two 220W Portable Solar Panels.
2.2 Key Features
- High Capacity & Output: 3600Wh battery capacity with 3600W AC output, expandable to 4500W with X-Boost technology.
- Rapid Charging: Fully charges in approximately 1.8 hours via 240V outlets (3000W) or 2.7 hours via 1800W wall outlets.
- Efficient Solar Charging: 220W portable solar panels with 22.4% conversion efficiency. Two 220W panels can fully recharge the unit in approximately 10 hours.
- Portable Solar Panel Design: Foldable, lightweight (20.9 lbs), and IP68 waterproof rating for durability and ease of transport.
- Versatile Outputs: Features 15 outlets including 5 AC, 4 USB-A, 2 USB-C, 2 DC, 1 car power output, and 1 Anderson port.
- Smart App Control: Monitor and control the power station remotely via the EcoFlow app using Wi-Fi or Bluetooth.

Figure 2.3: Solar panel construction highlighting ETFE film and weather resistance.
3. Setup
3.1 Unpacking and Inspection
- Carefully unpack all components. Note that the DELTA Pro and solar panels may ship separately.
- Inspect for any visible damage. If damage is found, contact customer support immediately.
- Ensure all listed components are present.
3.2 Initial Charging of DELTA Pro
Before first use, it is recommended to fully charge the DELTA Pro power station.
- AC Charging: Connect the AC charging cable to the AC input port on the DELTA Pro and then to a standard wall outlet. The display will indicate charging status.
- Solar Charging: Proceed to section 3.3 for solar panel setup.
3.3 Solar Panel Setup
- Unfold the 220W portable solar panels.
- Position the panels in direct sunlight. Utilize the integrated solar angle guide for optimal positioning (typically 30-60 degrees relative to the ground).
- Connect the solar panels to the DELTA Pro's solar input port using the appropriate solar charging cable.
- The DELTA Pro display will show the incoming solar wattage and charging status.

Figure 3.1: Setting up the solar panel with the integrated angle guide.
4. Operating Instructions
4.1 Powering On/Off
- To power on, press and hold the main power button until the display illuminates.
- To power off, press and hold the main power button until the display turns off.
4.2 Using AC/DC/USB Outputs
Ensure the DELTA Pro is powered on before connecting devices.
- AC Outlets: Press the AC power button to enable AC output. Plug your AC devices into the available outlets.
- DC Outlets: Press the DC power button to enable DC output. Plug your DC devices into the available ports (e.g., car power output, DC5521 ports).
- USB Ports: USB-A and USB-C ports are typically active when the unit is on. Connect your USB devices directly.

Figure 4.1: DELTA Pro output ports.

Figure 4.2: DELTA Pro digital display.
4.3 Smart App Control
Download the EcoFlow app from your device's app store. Follow the in-app instructions to connect your DELTA Pro via Wi-Fi or Bluetooth. The app allows you to:
- Monitor charge level, temperature, and charge/discharge times.
- Control settings such as battery life optimization, input/output parameters.
- Customize energy usage and view energy habits.

Figure 4.3: DELTA Pro in use during camping, powering multiple devices.
5. Maintenance
5.1 General Care
- Keep the DELTA Pro and solar panels clean and dry.
- Avoid exposing the unit to extreme temperatures or direct sunlight for prolonged periods when not in use.
- Ensure ventilation openings on the DELTA Pro are not blocked.
5.2 Cleaning
- Use a soft, dry cloth to wipe down the surfaces of the DELTA Pro and solar panels.
- For stubborn dirt, a slightly damp cloth can be used, followed by immediate drying.
- Do not use harsh chemicals or abrasive cleaners.
5.3 Storage
- Store the DELTA Pro in a cool, dry place, away from direct sunlight and moisture.
- For long-term storage, charge the battery to approximately 60-80% every 3 months to prolong battery life.
- Store solar panels folded in their protective case.
6. Troubleshooting
6.1 Common Issues and Solutions
| Issue | Possible Cause | Solution |
|---|---|---|
| DELTA Pro not turning on | Low battery; Power button not held long enough | Charge the unit; Press and hold the power button for 3 seconds. |
| No AC output | AC button not enabled; Overload; Unit too hot/cold | Press AC button; Reduce load; Allow unit to cool/warm. |
| Solar panels not charging | Insufficient sunlight; Incorrect connection; Damaged panel/cable | Reposition panels for direct sun; Check cable connections; Inspect for damage. |
| App connection issues | Bluetooth/Wi-Fi off; App not updated; Interference | Ensure Bluetooth/Wi-Fi is on; Update app; Move closer to unit. |
For issues not covered here, please refer to the official EF ECOFLOW support resources or contact customer service.
7. Specifications
7.1 DELTA Pro Power Station
- Model Name: EFD500
- Battery Capacity: 3600Wh
- AC Output: 3600W (Pure Sine Wave, 4500W with X-Boost)
- Total Power Outlets: 15 (5 AC, 4 USB-A, 2 USB-C, 2 DC, 1 Car, 1 Anderson)
- Voltage: 120 Volts (DC)
- Item Weight: 99 Pounds
- Product Dimensions: 11.2"L x 16.4"W x 25"H
- Special Feature: X-Boost Technology, X-Stream Fast Charging
- Fuel Type: Electric
- Power Source: Solar Powered
7.2 220W Portable Solar Panel
- Rated Power: 220W
- Efficiency: 22.4%
- Waterproof Rating: IP68
- Weight: 20.9 lbs
- Folded Dimensions: 32.3" x 19.7" x 1.3"

Figure 7.1: High efficiency N-type solar cell details.

Figure 7.2: Bifacial solar panel performance across various surfaces.
8. Safety Information
Please observe the following safety precautions to prevent injury or damage to the product:
- Do not disassemble, repair, or modify the unit or solar panels.
- Keep the product away from fire, heat sources, and direct sunlight when not in use.
- Avoid contact with liquids. Do not immerse the product in water.
- Use only original or certified compatible accessories.
- Ensure proper ventilation during operation to prevent overheating.
- Keep out of reach of children and pets.
- Handle with care; avoid dropping or subjecting the unit to strong impacts.
9. Warranty and Support
EF ECOFLOW products typically come with a limited warranty. Please refer to the warranty card included with your product or visit the official EF ECOFLOW website for detailed warranty terms and conditions.
For technical support, troubleshooting assistance, or warranty claims, please contact EF ECOFLOW customer service through their official website or the contact information provided in your product packaging.







