Charge the station from the sun
Add panels — we will work out how much sun a full charge takes and whether generation covers your daily use. Add panels — we will work out charging time and energy balance.
An estimate: panel yield for Kyiv is 4.5 hours of full sun a day in summer (with a margin) and 1 hour in winter, panel losses included; charging and inverter efficiency 85%; panels give no more than the solar input of the station accepts. Appliance hours are typical, the fridge counts only compressor time (~35%); half of the daily use is taken as night use, which the station has to cover. Real generation depends on cloud cover, the angle and how clean the panels are.
The EcoFlow 400W Lightweight Solar Panel is the most powerful portable panel in EcoFlow’s new generation. It is bifacial, uses N-Type TOPCon cells with 25% efficiency and weighs about 10.2 kg. That is 5.8 kg less than EcoFlow’s previous 400-watt model. If you want to buy EcoFlow 400W Lightweight Solar Panel for a DELTA, a single panel almost fills the 500 W solar input of DELTA 2 and DELTA 3 stations.
The XT60 cable is built into the panel and the stand is integrated into the housing. Unfold it, set the angle, plug it into the station: the whole thing takes less than a minute.
Why the 400W Lightweight
5.8 kg lighter
EcoFlow’s previous portable 400 W panel weighed about 16 kg and came with a separate kickstand case. The Lightweight weighs 10.2 kg, measures 659 x 967 x 36 mm folded and is carried by its handle like a large, thin case. At a country house or a campsite that is the difference between “I’ll take it” and “I’ll leave it at home”.
Bifacial generation
The rear side of the panel also catches light reflected from grass, sand, snow or a light-coloured mat. EcoFlow rates the 400 W for the front side under standard conditions, and the rear adds energy on top, especially over a light surface.
N-Type TOPCon and 25% efficiency
The monocrystalline N-Type TOPCon cells convert up to 25% of sunlight. As a rule, they also lose less power when hot than cells of the previous generation.
Three-angle stand
The built-in stand locks at 30, 45 or 60 degrees. 30 degrees suits summer, 45 spring and autumn, and 60 winter, when the sun is low. The solar angle guide on the housing helps aim the panel precisely: when its shadow disappears, the light is hitting it at a right angle.
IP68 protection
The panel is protected against water and dust to IP68 and does not mind rain or wet grass. EcoFlow does not recommend leaving it hanging outdoors for long periods or mounting it on a vehicle. It is a portable model: you unfold it when you need it and fold it away after use.
Compatible power stations
The open-circuit voltage of the panel is 39.3 V and the short-circuit current is 12.2 A. It is a high-voltage panel, so it does not suit every station:
- DELTA 2, DELTA 2 Max, DELTA 3, DELTA 3 1500, DELTA 3 Plus, DELTA 3 Max and DELTA 3 Max Plus – the 11-60 V input accepts the panel directly. Stations with two solar inputs can work with two of these panels, one per input.
- DELTA Pro and DELTA Pro 3 – two panels in series give 78.6 V and suit the high-voltage input of these stations. This connection needs XT60 – MC4 adapters, sold separately.
- RIVER 3 Plus, RIVER 2 Pro and RIVER 2 Max – the voltage is within range, but these stations draw up to 220 W from solar. The panel will work, though not at full power.
- RIVER 2, RIVER 3, RIVER 3 UPS and TRAIL have an input of up to 30 V. This panel does not suit them. For those, choose the EcoFlow 110W Lightweight Solar Panel or the 160W Lightweight.
How much energy 400 W gives
The rating is measured under standard conditions: 1000 W/m², +25 °C, light at a right angle. In practice a portable panel delivers roughly 60-80% of its rating. On a clear summer day in Ukraine that is roughly 1.4-2 kWh per day, if you turn the panel towards the sun every few hours. That is enough to fill a DELTA 3 with 1024 Wh and use part of the energy during the day. You can work it out for your station in the calculator above this description.
Who it is for
- Owners of DELTA 2, DELTA 3 and DELTA 3 Plus who want to fill the station as much as possible during daylight.
- A country house without the grid or with frequent power cuts, where the panel is set out in the morning and folded in the evening.
- Camping with a fridge, lighting and laptop charging.
- Anyone who already has a DELTA Pro or DELTA Pro 3 and wants to set up a powerful solar station quickly.
Specifications
| Parameter | Value |
|---|---|
| Rated power | 400 W (±5 W) |
| Cell type | N-Type TOPCon, monocrystalline, bifacial |
| Efficiency | 25% |
| Open-circuit voltage (Voc) | 39.3 V |
| Voltage at max. power (Vmp) | 34.5 V |
| Short-circuit current (Isc) | 12.2 A |
| Current at max. power (Imp) | 11.7 A |
| Unfolded dimensions | 2509 x 967 x 26 mm |
| Folded dimensions | 659 x 967 x 36 mm |
| Weight | approx. 10.2 kg |
| Connector | built-in XT60 cable |
| Stand | built-in, 30° / 45° / 60° |
| Protection | IP68 |
| Manufacturer warranty | 5 years |
In the box
- EcoFlow 400W Lightweight solar panel with built-in XT60 cable.
- User manual, safety instructions and warranty card.
Tips for use
Set the panel up in an open spot where trees, buildings or vehicles do not cast shade on it. Even shade on one section noticeably reduces the current. For bifacial generation, lay something light-coloured under the panel or set it on grass rather than dark asphalt. Turn the panel towards the sun two or three times a day. Fold it when dry and store it in a case or a cupboard, not outdoors.
Frequently asked questions
Can I connect it to a RIVER 3?
No. The input of RIVER 3, RIVER 2 and TRAIL accepts up to 30 V, while the open-circuit voltage of this panel is 39.3 V. Connecting it could damage the station. Panels of 110 or 160 W suit these models.
Can I connect two panels for a DELTA 3?
Not in series: 78.6 V is more than the 11-60 V input accepts. In parallel the current would exceed 15 A and the station would limit the input anyway. For a DELTA 3 the optimal choice is one 400 W panel per input.
Do I need a separate cable?
No, the XT60 cable is built into the panel and plugs straight into EcoFlow stations with an XT60 or XT60i input.
Can I leave the panel on a car roof while driving?
EcoFlow does not recommend it: a portable panel is not designed for wind load in motion or for long periods outdoors. For permanent mounting there are rigid and flexible panels.
The manufacturer warranty on the EcoFlow 400W Lightweight Solar Panel is 5 years under the EcoFlow Europe policy, with service handled by EcoFlow in the EU. To buy EcoFlow 400W Lightweight Solar Panel, place an order on the website: we ship by Nova Poshta across Ukraine, and you can pay on delivery.
