Photo from the manufacturer
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STREAM AC is an AC-coupled balcony battery with nothing to plug into it: no panels of its own, no onboard outlet to connect an appliance or a microinverter. It connects only through its grid terminal, straight into a home outlet or at the end of another unit in the STREAM range, and from there it exchanges energy with the existing electrical system. Below zero the battery heats itself to keep charging even in winter.
With no outlets of its own, appliances connect to any other outlet in the home: it's the app that decides how much energy to send in that direction based on the settings chosen. It's built mainly to add capacity to a system that already has another unit with outlets, or for a system spread across several rooms that shares the battery over the home Wi-Fi; and when it joins a chain of several units, it always goes at the end, never in the middle.
Basic control 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 scheduling around energy prices still depends on a stable connection. It resists rain and splashes and mounts to a wall, or stacks on another unit. It's the right choice for anyone who just wants more kilowatt-hours to add to a STREAM system already installed elsewhere in the home, not for anyone looking for a place to plug in an appliance directly or stay powered during a blackout: with no outlets of its own, when the grid drops there's nothing to draw current from.
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 |
| 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 | 0.8 kW | Declared by the brand |
| Dynamic tariffs | Built in | Declared by the brand |
| Backup power | None | 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 | 899 € | Declared by the brand |
| Depth of discharge | — | Not declared |
| Cell supplier | — | Not declared |
| Maximum expanded capacity | — | Not declared |
| Maximum solar input | — | Not declared |
| MPPT trackers | — | Not declared |
| Backup output | — | 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.
