Photo from the manufacturer
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STREAM AC Pro is a balcony battery with no panels of its own: it AC-couples to an already installed solar system, through a microinverter connected directly to one of its two AC outlets, or it simply stays connected to the home grid. Below zero the battery heats itself to keep charging even in winter.
It has two AC outlets of its own and can power appliances connected there even when a blackout hits: it switches to the battery on its own to keep them running, though the switchover isn't instant. It grows by connecting other units in the STREAM range in a chain in the same room or spread across different rooms, sharing the battery through the app; paired with another unit that has its own outlets, the power available on its outputs increases further.
Basic control - turning it on, checking the charge level - also works over Bluetooth when Wi-Fi doesn't reach that far, but staying offline limits functions: you see one unit at a time and can't access scheduling around energy prices, which needs a stable connection and the linked account. It resists rain and splashes and can stay mounted outdoors, fixed to a wall or stacked on another unit. It's built for anyone who already has panels or a working solar system and wants storage that fits in without touching the existing inverter, and for anyone who wants to keep a few outlets powered when the power goes out. It isn't the right choice for anyone who needs truly uninterrupted power: equipment that can't tolerate a disconnection, however brief, shouldn't be plugged in here.
official manufacturer list price — on nominal capacity
| Parameter | Value | Source |
|---|---|---|
| Nominal capacity | 1.92 kWh | Declared by the brand |
| Cell chemistry | LFP (lithium iron phosphate) | Declared by the brand |
| Expandable | Yes | Declared by the brand |
| Maximum expanded capacity | 11.52 kWh | Declared by the brand |
| Battery voltage | 19.2 V | Declared by the brand |
| Feed-in limit | 800 VA | Declared by the brand |
| Inverter included | No | Declared by the brand |
| Grid charging | Yes | Declared by the brand |
| Maximum charge power | 1.05 kW | Declared by the brand |
| Dynamic tariffs | Built in | Declared by the brand |
| Backup power | EPS (brief interruption) | Declared by the brand |
| Backup output | 1200 W | Declared by the brand |
| Rated cycles | 6000 cicli | Declared by the brand |
| Warranty | 10 anni | Declared by the brand |
| Ingress protection | IP65 | Declared by the brand |
| Mounting | Wall mounted | Declared by the brand |
| Minimum temperature | -20 °C | Declared by the brand |
| Maximum temperature | 55 °C | Declared by the brand |
| Cell heating | Yes | Declared by the brand |
| Noise level | 30 dB | Declared by the brand |
| Works without internet | With limitations | Declared by the brand |
| Declared standards | CE | Declared by the brand |
| Official list price | 999 € | Declared by the brand |
| Depth of discharge | — | Not declared |
| Cell supplier | — | Not declared |
| Maximum solar input | — | Not declared |
| MPPT trackers | — | Not declared |
| Switchover time | — | Not declared |
| Capacity at end of cycle life | — | Not declared |
| Guaranteed throughput | — | Not declared |
| Guaranteed remaining capacity | — | Not declared |
| Round-trip efficiency | — | Not declared |
| Standby consumption | — | Not declared |
| Local control | — | Not declared |
| Open protocols | — | Not declared |
| Home Assistant integration | — | Not declared |
| Where the data is hosted | — | Not declared |
| Remote updates | — | Not declared |
| App required for setup | — | Not declared |
| Battery passport | — | Not declared |
| Carbon footprint | — | Not declared |
| Recycled content | — | Not declared |
The rest of the data comes from one page on the manufacturer's site, cited row by row in the table above.
A manual or a datasheet counts as a source even when the original file is hosted elsewhere: what matters is the document, not the server. Where that happens, it is stated above.
These numbers are calculated, not stated: they have no source to cite, they have a formula you can redo. The price used is the manufacturer's list price, which is stable and the same in every country — not a shop's price on the day.
Chosen by the declared use tier and footprint, not by price: we don't publish prices.
