Stored kilowatt-hours only pay back if the house uses them at night · review
A 7.2 kWh AC-coupled system supplied with a Pro 3EM smart meter, rated 2400 W in both directions with an 800 W limit available, and carrying a backup socket for outages.
The bottom line The only unit in this family that publishes what it can deliver and the limit it can be set to — the two figures that decide both what it runs and whether it is permitted. It publishes no cycle count at all, which on a 7.2 kWh system is the largest omission on this page.
A 7.2 kWh stacked system supplied complete with a smart meter, aimed at houses that already generate.
2400 W of charge and discharge, with the ability to limit output to 800 W. Publishing both is unusual and it answers two different questions: what the system can do, and whether it can be made to comply with a rule written around a ceiling.
−20 °C to +55 °C. Most listings on this shelf publish neither end; this one publishes both, which matters for a unit that may sit in an unheated space or against a south-facing wall.
The system, the PRO 3EM smart meter, and a mains cable with a safety plug. Zero-export operation is described as automatic once the meter is connected, which is the arrangement most households in this position actually want.
No cycle count. On the largest system in this family, that is the figure that would decide whether the investment lasts long enough to matter, and it is not published.
German Amazon store quoted about 1535 € when this page was compiled.
French, Italian and Spanish Amazon catalogues carry an entry for it, with nobody selling.
American and British Amazon stores returned nothing at all, so the buy button there runs a search instead of landing on an empty page.
These figures are what Keepa reported on the day this page was last updated. Availability and pricing move without notice.
Prices quoted in this text were read on 16 September 2026. The live price is at the top of the page.
| Usable capacity | Nowhere in the listing — 7.2 kWh is published as storage capacity, expandable to 12 kWh with up to five SPB 246X packs |
|---|---|
| Charge and discharge power | Up to 2400 W charging and discharging, limitable to 800 W, fourth bullet — the only unit here to publish both a figure and a limit |
| Chemistry | LiFePO4, fourth bullet |
| Cycle life | Nowhere in the listing |
| Inverter compatibility | AC-coupled, first bullet, described as suiting existing PV installations and balcony systems without modification |
| Published metering | A PRO 3EM smart meter is included, and the fifth bullet describes automatic prevention of export to the grid |
| Amazon reference | B0GTR33136 (same reference on 4 Amazon marketplaces) |
| EAN | 4260427617519 |
Because several national rules for plug-in installations are written around an output ceiling. The listing publishes the limit as a setting, which is the product half of that conversation; whether it applies to you is decided by the rules where you live.
The listing says important devices can continue during an outage and gives no rating for the socket. Without a wattage, what it will carry cannot be read from the page, and this review does not infer it from the 2400 W system figure.
1600 Wh base, up to 8 kWh · 1600 W output · 3 MPPT, 2700 Wp solar · LiFePO4 · IP65 · AC-coupled · smart meter and tariff integration
An AC-coupled all-in-one balcony storage system with three MPPT trackers taking 2700 Wp, a 1600 W output, expansion to four packs, and integration with dynamic electricity pricing.
Best for: A household on a dynamic electricity tariff that already has roof PV and wants to stop exporting surplus.
≈ €448
1.92 kWh nominal · 2800 W solar across 4 MPPT · 1200–2300 W on two AC ports · LFP, 6000 cycles · IP65 · down to −20 °C · 26 cm wide
An AC-coupled 1.92 kWh LFP unit with four MPPT trackers taking 2800 W of solar, two mains ports rated 1200 to 2300 W, IP65 and stated operation to −20 °C.
Best for: A narrow indoor space beside an existing balcony installation, where four panel groups need managing separately.
≈ €549
1.92 kWh nominal, up to 11.52 kWh · AC-coupled · bidirectional DC/AC efficiency 96.5 % · AC round-trip efficiency 86 % · app control
An AC-coupled 1.92 kWh battery expandable to 11.52 kWh whose listing publishes both a conversion efficiency and a round-trip efficiency — the only one in this family that does.
Best for: Someone comparing storage on what a stored kilowatt-hour costs rather than on headline capacity.
≈ €545
