From the facts the maker states, by the rules of our advisor.
Green is the best of these 3, also when they share the lead.
| This model EcoFlow STREAM Ultra X Best on 2 facts | Much better, not dearer Jackery SolarVault 3 Pro Best on 3 facts | Higher score, 4% cheaper Jackery SolarVault 3 Pro Max Best on 3 facts | |
|---|---|---|---|
| Most important facts | |||
| The lowest price today at a shop that delivers to you, delivery included. A price with an asterisk comes from a shop abroad, and its delivery cost is our own estimate. Lowest price | € 1,139EcoFlow (brand store) | € 729Jackery (brand store) best | € 1,089Jackery (brand store) |
| Our own score out of 10: 70% the maker’s facts and 30% shop ratings. Price does not count. Score | best | best | |
| The average of the stars buyers give at the shops, with the number of reviews behind it. We only compare it from 20 reviews. Customer rating | – | – | – |
| The cells’ full capacity, before the reserve the battery keeps. The usable capacity is the figure to compare. In this comparisonSource
| 3.8 kWh best | 2.5 kWh | 2.5 kWh |
| How far the system grows with extra batteries, in usable capacity. In this comparisonSource
| 23 kWh best | 15.1 kWh | 15.1 kWh |
| The most power the battery delivers to your home without a break, as the maker states it. In this comparisonSource
| 800 W | 1,200 W | 2,500 W best |
| The most solar power the battery takes in directly from panels. In this comparisonSource
| 2,000 W | 4,000 W best | 4,000 W best |
| How many full charge cycles the maker rates the cells for. In this comparisonSource
| 6,000 | 6,000 | 6,000 |
| How many years the maker’s warranty on the battery runs. In this comparisonWhen it matters
When it matters less
Source
| 10 years | 10 years | 10 years |
| What the battery powers during a power cut: nothing, a device at its own socket, chosen circuits, or the whole home. Source
| At a socket on the battery | At a socket on the battery | At a socket on the battery |
On 14 November 2026 the lowest price for the EcoFlow STREAM Ultra X is € 1,139 at EcoFlow (brand store), delivery to the Netherlands included. In our ranking it is rank 7 of 12 for a balcony solar system, with a score of 4.9 out of 10.
Including VAT and delivery. We may earn a commission when you buy through our links. How we read and order prices
Also at Amazon, price not shown yet: Amazon.de.
cannot be checked: Discount as claimed by the shop. We have not followed this shop for the 30 days before the sale began, so we cannot verify the old price yet. How we work this out
Product on the market since August 2025
How the battery connects to your home: to a socket, to a balcony solar system, through a hybrid inverter, on the AC side of an installed system, as a module for an inverter, or as a portable power station.
Source: derived, no source of its own · checked on 2 Nov
The cells’ full capacity, before the reserve the battery keeps. The usable capacity is the figure to compare.
3.8 kWh on this model
Lowest
1 kWh Highest
12.3 kWh Middle
2.5 kWh
Higher than 26 of the 41 models we track.
Source: de.ecoflow.com · checked on 2 Nov
How far the system grows with extra batteries, in usable capacity.
23 kWh on this model
Lowest
6.7 kWh Highest
61.4 kWh Middle
13.8 kWh
Higher than 30 of the 40 models we track.
Source: de.ecoflow.com · checked on 2 Nov
How many battery units one system takes.
4 on this model
Lowest
1 Highest
6 Middle
5
Lower than 29 of the 40 models we track.
Source: de.ecoflow.com · checked on 2 Nov
The extra battery the maker sells to add capacity.
Source: de.ecoflow.com · checked on 2 Nov
The most power the battery delivers to your home without a break, as the maker states it.
800 W on this model
Lowest
800 W Highest
12,000 W Middle
2,400 W
Lower than 27 of the 43 models we track.
Source: de.ecoflow.com · checked on 2 Nov
The output the battery is set to when it arrives, which can be lower than its maximum.
800 W on this model
Lowest
200 W Highest
800 W Middle
800 W
Higher than 3 of the 26 models we track.
Source: de.ecoflow.com · checked on 2 Nov
How fast the battery charges from the grid.
1,200 W on this model
Lowest
800 W Highest
4,000 W Middle
2,050 W
Lower than 17 of the 30 models we track.
Source: de.ecoflow.com · checked on 2 Nov
The power passed straight through to the socket on the battery, such as when it is full or switched off.
2,300 W on this model
Lowest
2,000 W Highest
3,600 W Middle
2,300 W
Lower than 4 of the 13 models we track.
Source: de.ecoflow.com · checked on 2 Nov
Where the battery connects to the solar system: on the DC side, between the panels and the inverter, or on the AC side, behind the inverter.
Source: derived, no source of its own · checked on 2 Nov
The most solar power the battery takes in directly from panels.
2,000 W on this model
Lowest
0 W Highest
10,000 W Middle
2,200 W
Lower than 17 of the 34 models we track.
Source: de.ecoflow.com · checked on 2 Nov
How many separate strings of panels it takes, each tracked for its best power.
4 on this model
Lowest
2 Highest
4 Middle
3
Higher than 13 of the 25 models we track.
Source: de.ecoflow.com · checked on 2 Nov
The highest voltage the solar input takes. A string of panels must stay below it, on a cold day too.
60 V on this model
Lowest
55 V Highest
600 V Middle
60 V
Higher than 6 of the 20 models we track.
Source: de.ecoflow.com · checked on 2 Nov
How many full charge cycles the maker rates the cells for.
6,000 on this model
Lowest
3,000 Highest
10,000 Middle
6,000
Lower than 9 of the 39 models we track.
Source: de.ecoflow.com · checked on 2 Nov
The share of capacity the maker says is left after the rated cycles.
70 % on this model
Lowest
60 % Highest
80 % Middle
70 %
Lower than 5 of the 21 models we track.
Source: de.ecoflow.com · checked on 2 Nov
How many years the maker’s warranty on the battery runs.
10 years on this model
Lowest
5 years Highest
12 years Middle
10 years
Higher than 9 of the 45 models we track.
Source: de.ecoflow.com · checked on 2 Nov
What the battery powers during a power cut: nothing, a device at its own socket, chosen circuits, or the whole home.
Source: de.ecoflow.com · checked on 2 Nov
Whether the system runs without any grid connection.
13 of the 16 models we track have this.
Source: de.ecoflow.com · checked on 2 Nov
Whether the battery can charge when power is cheap and discharge when it is dear, on an hourly price.
27 of the 27 models we track have this.
Source: de.ecoflow.com · checked on 2 Nov
Whether you can set times for the battery to charge and discharge.
13 of the 13 models we track have this.
Source: de.ecoflow.com · checked on 2 Nov
How the battery connects to your network or the app.
Source: de.ecoflow.com · checked on 2 Nov
The maker’s app for the battery.
Source: de.ecoflow.com · checked on 2 Nov
How well the case keeps out dust and water. A battery that stands outdoors needs a higher rating.
Source: de.ecoflow.com · checked on 2 Nov
The coldest temperature at which the battery works.
-20 °C on this model
Lowest
-20 °C Highest
-10 °C Middle
-20 °C
Lower than 1 of the 31 models we track.
Source: de.ecoflow.com · checked on 2 Nov
The warmest temperature at which the battery works.
55 °C on this model
Lowest
45 °C Highest
60 °C Middle
55 °C
Higher than 2 of the 31 models we track.
Source: de.ecoflow.com · checked on 2 Nov
Whether the battery warms its own cells, so it charges in cold weather.
30 of the 30 models we track have this.
Source: de.ecoflow.com · checked on 2 Nov
The weight of the battery, or of one unit for a battery built from several.
38.8 kg on this model
Lowest
4.7 kg Highest
82 kg Middle
26.25 kg
Higher than 28 of the 40 models we track.
Source: de.ecoflow.com · checked on 2 Nov
How loud the battery is while it runs, as the maker states it.
30 dB on this model
Lowest
30 dB Highest
43 dB Middle
30 dB
Lower than 3 of the 14 models we track.
Source: de.ecoflow.com · checked on 2 Nov
Whether you set the battery up yourself or an electrician has to connect it.
Source: de.ecoflow.com · checked on 2 Nov
Sources: de.ecoflow.com
Confidence: medium. Fewer than 300 owners’ ratings at the shops. The highest score today is 6.9.
Owners’ ratings 30%–
Owners’ ratings, 30%: none yet at the shops that deliver to the Netherlands, so this part is left out and the score is the features part alone.
Features 70%4.9
37.91428571428571 of 78 points for the maker’s facts, the other 22 counted at the market’s average share of 50%.
The maker
EcoFlow makes portable power stations, solar equipment and home energy storage, and was started in 2017 by a group of battery engineers. The company says it has regional headquarters in the USA, Germany and Japan. Its home batteries include the STREAM Ultra and the STREAM Ultra X, alongside the DELTA Pro 3 power station.
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