EcoFlow 400W Rigid Solar Panel | 2-Pack | Outbound Power
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EcoFlow 400W Rigid Solar Panel | 2-Pack

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Experience The Most Efficient Solar Energy On The Market With The EcoFlow 400W Rigid Solar Panel

Reduce your reliance on the grid with the EcoFlow 400W Rigid Solar Panel. This pair of high-performance panels boast an impressive 23% conversion efficiency, translating to faster charging times for your EcoFlow portable power stations and other compatible devices.

Whether you're seeking a reliable off-grid power source, a way to reduce your electricity bills, or a backup solution for emergencies, these 400W Rigid Solar Panels are the perfect addition to your sustainable energy toolkit.

With their high-efficiency monocrystalline cells, IP68 waterproof rating, and robust aluminum frame, these panels are built to last. They can withstand even the harshest weather conditions, so you can be sure that your devices will always have power when you need it.

Please note: These panels are delivered by truck freight direct from the manufacturer warehouse. It may take up to two weeks for your order to process and ship.

EcoFlow 400W Rigid Solar Panel On An RV Roof At An Angle

EcoFlow 400W Rigid Solar Panel Features

Fast Charging

With a high conversion efficiency rate of up to 23%, the 400W panel charges your LFP batteries faster than similar-sized solar panels.

Waterproof & Durable

The 400W rigid solar panel is designed for the outdoors. With an IP68* waterproof rating and a robust anti-corrosive aluminum frame, the panel can withstand a wind speed of up to 130mph* and a significant snow load of up to 113lb* and continue to capture solar energy for years to come.

Off-Grid & On-Grid Solution

This high-wattage panel works for both on-grid and off-grid solar-powered setups, storing energy for outages, reducing power bills, or powering an off-grid home.

Universally Compatible

EcoFlow solar panels use an all-inclusive solar connector, so you can even use them with your existing 48V power system. The 400W solar panel includes a 300mm charging cable that gives you plenty of space to mount multiple panels, maximizing solar input.


What's In The Box

  • 2 x 400W Rigid Solar Panels (800W Total)
  • 4 x Rigid Solar Panel Mounting Feet
  • 1 x User Manual
  • 1 x Warranty Card

Please note: If you intend to connect these panels to an EcoFlow power station other than the DELTA Pro Ultra, you will need to purchase the MC4 to XT60 solar charging cable.


EcoFlow 400W Rigid Solar Panel Specifications

  • Rated Power: 400W (±3%)
  • Open Circuit Voltage: 37.10V (±3%)
  • Short Circuit Current: 13.79A (±5%)
  • Maximum Operating Voltage: 31.00V
  • Maximum Operating Current: 12.90A
  • Temperature Coefficient of Rated Power: -0.38%/°C
  • Temperature Coefficient of Open Circuit Voltage: -0.35%/°C
  • Temperature Coefficient of Short Circuit Current: 0.06%/°C 
  • Maximum System Voltage: 1500V DC (UL)
  • Maximum Fuse Current: 25A
  • Dimensions (cm): 172.2 × 113.4 × 3.5
  • Dimensions (inches): 67.8 × 44.6 × 1.38
  • Connector Type: Solar Connector
  • Efficiency: 23%
  • Cell Type: Monocrystalline
  • Net Weight Per Panel (kg): 21.8kg
  • Net Weight Per Panel (lbs): 48.1lbs


Frequently-Asked Questions

Why can't the solar panel reach the nominal power in actual use?

It is normal that the actual power does not reach the nominal power. You can get close to the nominal power by correcting for the following factors:

1. Light Intensity.

Changes in the intensity of sunlight will cause the output power to fluctuate up and down. The actual power will be closer to the nominal power when used at noon on a sunny day, and will be less than the nominal value in the early morning or afternoon. Weather conditions will also affect the amount of sunlight that shines on the panel. For example, you are much less likely to achieve the nominal power in hazy, cloudy, or rainy conditions.

2. Surface Temperature.

The surface temperature of the solar panel affects the power performance of the solar panel. The lower the surface temperature, the better the power performance. For example, when using solar panels in winter, the power is usually higher than in summer. Solar panels generally reach temperatures close to 60°C (140°F) during summer. This reduces nominal power by 10–15%, despite the higher levels of light shining on the panel.

3. Light Angle.

When the solar panel and the light angle are perpendicular, better power performance can be obtained. However, under special installation conditions (such as the roof of an RV), the solar panel can only be used in a tiled manner, which makes it impossible to form a vertical angle with the sunlight, resulting in a power loss of about 5–15%.

4. Light Occlusion.

When using solar panels, try to ensure that the surface is not covered, including projection, foreign objects, glass, etc., which will cause a significant drop in power.

If all of the above conditions are met, but the power used is much smaller than the nominal value, it may be a fault situation. In this case, you can contact EcoFlow customer service for assistance.

What is the power range that a 400W solar panel can typically achieve?

On a sunny day without clouds and direct sunlight, the power range of a 400W solar panel is between 320–350W (this data is obtained under the conditions of irradiance of 800–900W/m2 and the panel surface at 50°C (122°F)). The nominal data of the solar panel is obtained by testing under the conditions of AM1.5, meteorological conditions of 1000W/m2, and panel surface temperature of 25°C (77°F). A power close to the nominal value can usually be reached at midday on a sunny day in winter.

What are the precautions for the use of solar panels?

The solar panel is made of monocrystalline silicon wafer. During installation and use, please do not drop it on the ground with force, or use tools to hit the surface. Do not step on or sit on the solar panel, so as not to cause the monocrystalline silicon wafer to break and affect its use. Artificial damages will void the warranty.

Can I use solar panels of different specifications for mixed use?

Yes, but it is not recommended. Different energy storage controllers have requirements and restrictions on the output of solar panels. When solar panels with different current values are used in series, they will be limited, resulting in the inability to release the output power and even the short-board effect of 1+1<2.

Can I connect solar panels in parallel?

Yes. Parallel connection can double the current and increase the power. You can refer to the requirements for solar controllers and energy storage devices to ensure that they support larger values of input current to better determine the number of parallel connected solar panels. Additionally, it is necessary to pay attention to select a wire with a suitable wire diameter for safe connection according to the change of the output current.

Do solar panels need to be cleaned frequently?

Yes. When used outdoors for a long time, solar panels are prone to accumulate dust and foreign objects on the surface, causing a certain degree of light occlusion and reducing the output of power generation. Frequent cleaning keeps the surface of the solar panel clean and free of obstructions, allowing for better solar panel power output.

EcoFlow 400W Rigid Solar Panel Manual

Customer Reviews

Based on 103 reviews
James B.
Great battery backup solution

Cant' say how grateful we are to have found Outbound Power and the EcoFlow Delta 2 Max battery backup solution. Powered our fridge/freezer and portable cooler wih plenty of leftover power (with the extra battery) for on/off power during a 16 hour power outage. Kept the living area cool and the food fresh as noo one wants to waste $400.00 worth of fresh food/meat. Service from Outbound Power and customer service is excellent, followed up after the sale to ensure we were satisfied. Highly recommended!


Ordered from Outbound Power, great customer service and good pricing. The 2 items connected together make the perfect solution to keep our home cool and fridge
/freezer running in 110 heat when the power went out for 10+ hours. Very happy with our purchase and the customer service!

Thanks so much for your kind review and of course we are happy you are satisfied with the Delta 2 Max. It was our pleasure to be of service!

david p.
Great value for the price

6000 plus watts delived for less than $3200 when i bought it. Works great.

Thank you for your review and we're pleased to learn this setup works great. We appreciate your business and please feel welcome to be in touch anytime if we can ever be of service!

Robbie T.
Excellent whole house backup system.

Two Delta Pro Ultras with a total of 12.28 kwh of battery powered the roof AC and all the appliances for 3 hour. Looking forward to adding more batteries in the future. Much better than a gas generator and doesn't make all the noise.

Outstanding! This is fantastic news and we could not be happier with your satisfaction with the Delta Pro Ultra. We are always available if we can ever be of service!

Patricia B.
So far, so good

We ordered one Ecoflow Delta Pro Ultra inverter and one battery a few weeks ago. We wanted to see how they performed and decide if it would be the right system for us. The inverter and battery did everything they were supposed to do and performed flawlessly. We are so pleased that we will be expanding our system with another inverter and battery (batteries) very soon.

We are thrilled to learn you are satisfied with your Delta Pro Ultra. It has been our pleasure to be of service and please feel welcome to contact us anytime if we can ever be of further assistance!