EcoFlow Stream Ultra
(8 reviews)
1920 Wh, 4 MPPT and 2000 W of solar input: the all-in-one hybrid system that stores and feeds back solar power, expandable to 11.52 kWh.
- Capacity: 1920 Wh (LiFePO4), expandable to 11.52 kWh
- Solar: 4 MPPT, up to 2000 W input
- Output: 1200 W (2 AC outlets) + 800 W grid, 2300 W with two units
- All weather: IP65, self-heating battery down to -20 °C
- Built-in hybrid inverter, electrician-free install
Detailed overview: EcoFlow Stream Ultra hybrid solar battery kit, 4 MPPT
The EcoFlow Stream Ultra is the flagship of the STREAM plug-and-play solar kit range, alongside the Pro and Max variants which share the same battery but with fewer MPPT inputs. An all-in-one hybrid system, it packs a 1920 Wh LiFePO4 battery, a built-in inverter and 4-MPPT solar regulation into a single box, capturing, storing and releasing solar energy without stacking separate devices.
On the solar side, it accepts up to 2000 W of panels spread across its four MPPTs, with low-light technology that keeps harvesting energy even under hazy skies. The stored energy can then be fed back into the home grid at up to 800 W, or delivered straight to its two AC outlets for up to 1200 W, and up to 2300 W of connected appliances while the grid is available, the extra coming from the grid.
IP65 rated and fitted with a self-heating battery activated below 5 °C, it operates from -20 to 55 °C, allowing year-round outdoor installation. The EcoFlow app controls everything over Wi-Fi and Bluetooth, with an AI assistant that analyses consumption, off-peak tariff scheduling compatible with Nord Pool, Epex Spot or Octopus, and Solcast solar forecasts to anticipate output. The system is expandable to 11.52 kWh by linking several units, and up to 12 kW of solar input with 24 MPPTs across six connected units.
Electrician-free installation, a 10-year warranty and LFP cells rated for 6000 cycles make it a durable pick for anyone who genuinely wants to maximise solar self-consumption without stacking boxes.
Full specifications
Detailed characteristics (EAN: 4895251653473)
Battery
| Technology?Battery chemistry; LiFePO4 lasts far longer and can be fully discharged, gel/AGM is maintenance-free and cheaper. | LiFePO4 (lithium) |
|---|---|
| Energy?Stored energy in watt-hours. | 1920 Wh |
| Cycle life?Rated number of charge/discharge cycles, at the stated depth of discharge. | 6000 cycles (70 %) |
| Expandable up to?Maximum capacity reachable with add-on modules. | 11520 Wh |
Power and protection
| Output power?Maximum power delivered (for storages with a 230 V output). | 1200 W |
|---|---|
| Built-in BMS?Battery management system protecting against overcharge, deep discharge, short-circuit and overcurrent (lithium batteries). | Yes |
| Low-temperature protection / heating?Cuts off or heats charging in cold weather to protect the lithium cells. | Yes |
Solar section
| MPPT controllers?Number of built-in MPPT solar controllers (lets you connect panels facing different directions). | 4 |
|---|---|
| Max solar input?Maximum connectable PV power. | 2000 W |
| Micro-inverter?Power of the inverter that feeds energy back into the home grid. | 800 W |
Connectivity
| Bluetooth?Monitoring and settings via an app over Bluetooth. | Yes |
|---|---|
| Wi-Fi?Remote control and updates over Wi-Fi. | Yes |
Durability and format
| Ingress protection?Water and dust resistance (IP rating). | IP65 |
|---|---|
| Weight?Weight of the battery. | 23.1 kg |
| Dimensions (L × W × H)?Length × width × height, in millimetres. | 284 × 255 × 458 mm |
Availability and warranty
| Market launch?Date the model first became available on the European market. Useful to place its generation: technology moves fast in this segment, and a device several years old may be at the end of its commercial life. | April 2025 |
|---|---|
| Warranty?Length of the manufacturer's warranty. | 10 years |
Comparison
How does the EcoFlow Stream Ultra compare with other plug-and-play solar kits with battery storage, for searches like "best balcony solar kit with battery"? Here is how it stacks up against two references already in the catalogue: the Anker Solix Solarbank 3 E2700 Pro and the Zendure SolarFlow 2400 AC.
| Criterion | Stream Ultra | Solarbank 3 E2700 Pro | SolarFlow 2400 AC |
|---|---|---|---|
| Capacity | 1920 Wh | 2688 Wh | 2880 Wh |
| Solar input | 2000 W (4 MPPT) | 1200 W | 2400 W |
| AC output | 1200 W (2300 W pass-through) + 800 W grid | 800 W grid | 2400 W |
| Built-in inverter | Yes, hybrid | Microinverter | Yes, AC coupling |
| Observed price | ≈ £899 | ≈ £999 | ≈ £1099 |
In short, the Stream Ultra stands out for a notably lower entry price despite a slightly smaller capacity, and for its hybrid inverter that combines grid feed-in with direct outlet output. The Solarbank 3 Pro offers a higher capacity but with more limited solar input, while the SolarFlow 2400 AC targets the highest AC output in the comparison. For anyone starting out in balcony solar storage without wanting to pay a premium, the Stream Ultra remains the most accessible option of the three.
Related video
Video: I Tried Plug-In Solar for 90 Days (EcoFlow Stream Ultra UK Review) - Published on 31/10/2025
Our tester's review: Julien De Jurquet
The Stream Ultra has real arguments in its favour for balcony solar: no more choosing between storing and using power, it does both at once, and its 4 MPPT inputs efficiently harvest up to 2000 W even under hazy skies. The electrician-free install remains a real plus, you plug in the panels and the built-in inverter handles the rest. Two reservations hold us back from going further: it receives the harshest grade of its evaluation in an electromagnetic compatibility test, a finding whose relative weight is debated but not the observed phenomenon itself, and the surplus keeps being fed back to the grid even when the battery is full, a design choice the manufacturer stands by rather than a bug. The app's AI assistant, billed by subscription since launch at a now moderate rate, adds a recurring cost to factor into the calculation. Expandability up to 11.52 kWh remains a real plus for anyone starting small. A sound choice for maximising solar self-consumption at a lower cost, provided you accept these reservations.
In-depth review EcoFlow Stream Ultra: Our Full Review 3.8/5 Read our full review → Efficiency 3.7 Portability and size not measured Weather resistance not measured Output ports not measured Capacity and expansion 3.8 Solar input and MPPT 4.3 Control and smart features 3.6 Installation and compliance 3.6 Build and endurance 3.6 Battery compatibility not measured Safety and protections not measured Storage battery compatibility not measured Control and smart features not measured Compliance and grid connection not measuredFrequently asked questions: EcoFlow Stream Ultra hybrid solar battery kit, 4 MPPT
All three share the same 1920 Wh battery, but differ in solar regulation: 4 MPPT and 2000 W for the Ultra, 3 MPPT and 1500 W for the Pro, 2 MPPT and 1000 W for the Max. The Ultra maximises solar harvesting, especially with multiple panel orientations.
No, the Stream Ultra is designed for an electrician-free install: you connect the solar panels to its MPPT inputs, and the built-in hybrid inverter handles conversion and grid feed-in.
Yes, its built-in battery allows off-grid use for essential needs, with up to 1200 W available directly from its two AC outlets.
Yes. Storage is expandable from 1.92 to 11.52 kWh by linking several STREAM units, and solar input can rise to 12 kW with 24 MPPTs across six connected units.
Yes, it works with over 99% of solar panels on the market and also supports third-party microinverters, making it easy to integrate into an existing setup.
Yes, like any grid-connected solar installation, though the paperwork depends on where you live: registration in the Marktstammdatenregister in Germany (no separate grid-operator notification needed since the Solarpaket I reform), a declaration to Enedis in France (plus a Consuel safety certificate if wired into a dedicated circuit), a communication to the local distributor under CEI 0-21 in Italy, and registration under the RD 244/2019 self-consumption regime in Spain. Check the current rules where you live before commissioning it.
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Published on 23/08/2026, updated on 29/08/2026