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The EcoFlow 400W Portable Solar Panel is a foldable 400W panel that is built to feed a power station fast. It is rated IP68 and ships with a kickstand case.
It’s also heavy, large and priced at $699. Here’s what it really produces, what to check before you plug it in, and who should skip it.
Specs at a Glance
| Spec | EcoFlow 400W Portable Solar Panel |
|---|---|
| Rated power | 400W |
| Cell type | Monocrystalline, ETFE-coated |
| Efficiency | About 22–23% (the listing gives both figures) |
| Open-circuit voltage | 48V |
| Short-circuit current | 11A |
| Connector | MC4 |
| Weight | 35.3 lb |
| Unfolded size | 93.1 x 41.7 x 1 in |
| Protection | IP68 on the panel body; junction box and connectors are not submersible |
| Stand | Case converts to a 40–90° kickstand, per REI |
What It Really Produces
A 400W rating is a lab number. Our estimate uses the site’s usual math: 400W × 5 sun hours × 65–80% real-world factor.
| Sun Hours | Energy Added (our estimates) |
|---|---|
| 1 hour of strong sun | About 260–320Wh |
| 3 hours | About 780–960Wh |
| 5 hours | About 1,300–1,600Wh |
At that rate a 1,024Wh station refills in roughly one good day, and a 2,048Wh station in about a day and a half. Those are estimates and ignore charging losses.
One independent reviewer, a solar engineer who writes for WalkingSolar, measured the panel with an inline DC meter. He reported 345–380W in June full sun with the panel tilted, and 280–320W in October with it laid flat. Partly cloudy skies gave 150–250W, and overcast gave 50–100W.
That review doesn’t name the power station he used, so treat it as one data point. It does match what you’d expect: tilt and season matter more than the label.
Check Voltage Before You Buy
This panel’s open-circuit voltage is 48V, which is high for a portable panel. Some power stations cap solar input lower than that.
The WalkingSolar review says EcoFlow’s DELTA series accepts up to 60V, but a Jackery Explorer 1000 Plus tops out at 40V, below this panel’s 48V. It also says Jackery stations need an MC4 adapter. Check your station’s maximum input voltage and wattage in its manual first.
For longer cable runs, see our guide to solar panel wire.
EcoFlow 400W Portable Solar Panel Review
EcoFlow 400W Portable Solar Panel
The appeal is simple: one panel instead of two, with a built-in carry case and kickstand. It folds, it’s waterproof on the panel body, and the case doubles as an adjustable stand.
The catch is price and bulk. Amazon lists it at $699, or about $1.75 a watt. EcoFlow’s own 220W panel is $399, which works out to about $1.81 a watt. Several third-party 400W foldables are listed around $310–330, though we haven’t tested them.
It’s also big: 35.3 lb and over 93 inches long when open. The WalkingSolar reviewer calls it a two-handed carry and warns it acts like a sail in wind above 25 mph. Amazon shows 4.2 stars from 325 ratings, lower than EcoFlow’s smaller panels on the same page.
| Pros | Cons |
|---|---|
| 400W from a single foldable panel | Heavy at 35.3 lb and very long when open |
| Case converts to an adjustable stand | $699 is steep next to third-party 400W panels |
| IP68 panel body, MC4 connectors | 48V open-circuit voltage can exceed some stations’ limits |
| Sold and shipped by EcoFlow with 30-day returns | 4.2 stars, below EcoFlow’s smaller panels |
Best for: Campers, RV owners and home-backup users with a large EcoFlow power station who want fast solar charging from one panel.
Full details and current price: EcoFlow 400W Portable Solar Panel on Amazon
Prefer something lighter or cheaper? Compare it on our EcoFlow solar panel guide, the 400 watt solar panel roundup, or our foldable solar panels.
Frequently Asked Questions
Which power stations work with the EcoFlow 400W panel?
EcoFlow lists compatibility with its DELTA series and some third-party stations, according to REI. Check your station’s maximum solar input voltage against the panel’s 48V open-circuit rating.
How much power does it make in a day?
Our estimate is about 1,300–1,600Wh on a sunny day with around 5 good sun hours. Cloud, season and tilt can cut that sharply.
Is it waterproof?
The panel body is rated IP68. Amazon notes that the junction box and connection points should not be immersed in water.
Can one person carry it?
It weighs 35.3 lb and is over 93 inches long when open. One person can move it, but expect it to be awkward. The WalkingSolar reviewer advises anchoring it in wind.
Is it better than two smaller panels?
Two EcoFlow 220W panels list for $798 on Amazon, giving 440W. Each weighs 20.9 lb, so they are easier to carry. One 400W panel costs less and means one setup.
Final Verdict
The EcoFlow 400W Portable Solar Panel is a good fit if you have a big EcoFlow station and want fast charging from one panel. If weight, wind or price are concerns, two smaller panels or a cheaper third-party 400W panel may suit you better.