EcoFlow Stream AC Pro
(8 reviews)
1920 Wh and up to 2300 W of AC output: the plug-and-play expansion battery compatible with any microinverter on the market.
- Capacity: 1920 Wh (LiFePO4), expandable to 11.52 kWh
- Output: 1200 W (2 AC outlets), 2300 W with two units, 800 W to grid
- Compatibility: 100% of microinverters on the market
- All weather: IP65, self-heating battery down to -20 °C
- Plug-and-play expansion battery, no MPPT or inverter to manage
Detailed overview: EcoFlow Stream AC Pro AC expansion battery for solar kits
The EcoFlow Stream AC Pro is the pure battery variant of the STREAM range, designed to add storage to a balcony solar setup that already has a microinverter in place, whether from EcoFlow or another brand. Unlike the Stream Ultra, Pro or Max, which pack their own multi-MPPT solar regulation, the Stream AC Pro connects purely over AC, making it compatible with 100% of microinverters on the market.
Its 1920 Wh LiFePO4 battery exchanges up to 2300 W with the installation through its two AC outlets, both charging and discharging, with grid feed-in capped at 800 W in line with the usual balcony-solar rules. Two units can be paired to double the capacity and available power, and the system integrates into the full STREAM ecosystem: paired with a Stream Ultra, Pro or Max, it extends storage up to 11.52 kWh without redesigning the whole setup.
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 the same AI assistant and off-peak tariff scheduling as the rest of the STREAM range, automating charge and discharge strategies based on electricity tariffs.
Electrician-free installation, a 10-year warranty and LFP cells rated for 6000 cycles round out the picture. It is the simplest way to add storage to an already working balcony solar setup, without having to replace the microinverter in place.
Full specifications
Detailed characteristics
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 |
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. | 21.5 kg |
| Dimensions (L × W × H)?Length × width × height, in millimetres. | 255 × 254 × 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 AC Pro compare with other expansion batteries for balcony solar setups, for searches like "balcony solar expansion battery"? Here is how it stacks up against two references already in the catalogue: the Zendure AB2000L and the EcoFlow Stream AC 5000.
| Criterion | Stream AC Pro | Zendure AB2000L | Stream AC 5000 |
|---|---|---|---|
| Capacity | 1920 Wh | 1920 Wh | 5024 Wh |
| AC output | 1200 W (2300 W with two units) | 800 W to grid | 3000 W |
| Microinverter compatibility | 100% of the market | Zendure hub required | Existing microinverter |
| Expandable | 11.52 kWh | Up to 17.28 kWh | 15 kWh (90 kWh networked) |
| Observed price | ≈ £699 | ≈ £512 | ≈ £1499 |
In short, the Stream AC Pro stands out for its universal compatibility with microinverters already in place, without going through a proprietary hub the way the Zendure AB2000L requires. The Stream AC 5000 targets more ambitious use with far greater capacity, but at a notably higher price. For simply adding storage to an existing balcony solar setup without changing its electronics, the Stream AC Pro remains the most direct option.
Related video
Video: Ecoflow Stream Review: Is This the Battery of the Future? - Published on 01/10/2025
Our tester's review: Julien De Jurquet
The Stream AC Pro fills a real gap: a simple expansion battery, with no MPPT or built-in inverter, for anyone who already has a solar microinverter in place. It connects over AC, which makes it compatible with almost any existing setup, unlike systems that impose their own solar regulation. The 2300 W available when pairing two units easily handles power-hungry appliances, and integration into the STREAM ecosystem (Ultra, Pro, Max) lets you build an installation that grows over time. Off-peak tariff scheduling and the app's AI assistant remain strong points shared across the whole range. Our one reservation: availability remains limited in some markets at the time of writing. For anyone wanting to add storage to an existing solar setup without complexity, this is a solid option.
Frequently asked questions: EcoFlow Stream AC Pro AC expansion battery for solar kits
The Stream AC Pro is a pure battery, with no MPPT or built-in inverter: it connects over AC to a microinverter already in place. The Stream Ultra, by contrast, packs 4 MPPT and a hybrid inverter to manage solar panels directly.
Yes, as long as a solar microinverter is already in place: the Stream AC Pro connects directly to it over AC to add storage.
Yes, up to 1200 W per unit, and 2300 W when pairing two units, available directly from its AC outlets.
Yes, it is stated to be compatible with 100% of microinverters on the market, which sets it apart from systems that impose their own solar electronics.
Yes, pairing it with one of these models extends total storage up to 11.52 kWh without changing the rest of the setup.
Need help choosing?
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Published on 23/08/2026