Energy Depot DOMUS 2.5 vs RCT Power Battery 5.7
Technical comparison · High voltage
Both are high-voltage batteries with LFP cells, but they are not interchangeable: each works with the inverters the manufacturer lists, and the choice starts there. After that, the energy you need decides: 2.5 kWh usable in a low module, or 5.18 kWh in a floor-standing column (manufacturer-declared figures).
| Parameter | ||
|---|---|---|
| In brief | ||
| Usable capacity | 2.5 kWh | 5.18 kWh |
| Cell chemistry | LFP (lithium iron phosphate) | LFP (lithium iron phosphate) |
| Weight | 30 kg | 78 kg |
| Dimensions (W×D×H) | 44 × 32.8 × 18 cm | 34 × 34 × 83 cm |
| How long it lasts | ||
| Battery life cycles | 1825 cicli | 3650 cicli |
| The limit that runs out first | anni di garanzia | anni di garanzia |
| Rated cycles | 7000 cicli | — |
| Warranty | 5 anni | 10 anni |
| Guaranteed remaining capacity | 80 % | 80 % |
| The numbers | ||
| Energy density | 83.3 Wh/kg | 66.4 Wh/kg |
| Identity | ||
| Use tier | F2 — Room-sized (1–3 kWh) | F3 — Flat-sized (3–8 kWh) |
| Category specs | ||
| Depth of discharge | 100 % | 90 % |
| Expandable | Yes | Yes |
| Maximum expanded capacity | 20 kWh | — |
| Battery voltage | 51.2 V | 230 V |
| Declared compatible inverters | CENTURIO, KACO blueplanet hybrid 10TL3 | RCT Power Storage DC (6.0/8.0/10.0 LAN, 12.0): intervallo di tensione lato batteria 120-600 V dichiarato dall'inverter, entro cui rientra questa taglia (230 V nominali, 180-260 V di range). |
| Round-trip efficiency | 96 % | — |
| Standby consumption | 0.05 W | 5 W |
| SPI index (HTW Berlin) | 95.4 % | — |
| HTW test power class | 10 kW class | — |
| HTW test edition | Stromspeicher-Inspektion 2026 | — |
| Ingress protection | IP21 | ip42 |
| Mounting | — | Floor standing |
| Minimum temperature | 5 °C | 5 °C |
| Maximum temperature | 40 °C | 40 °C |
| Local control | — | None |
| Declared standards | CE, UN 38.3 | CE, UN 38.3, IEC 62619 |
The differences that matter
- Declared inverters: CENTURIO and KACO blueplanet hybrid 10TL3 versus the RCT Power Storage DC series → you pick the battery after the inverter, not before.
- Usable capacity: 2.5 kWh versus 5.18 kWh → the first grows by adding modules, the second starts with the larger reserve.
- Size: 30 kg and 18 cm high versus 78 kg and 83 cm → a low module versus a column for the floor.
- Warranty and standby draw: 5 years and 0.05 W versus 10 years and 5 W → the second is covered longer but draws more when idle.
Which one to choose
Choose Energy Depot DOMUS 2.5 if…
your inverter is a CENTURIO or a KACO blueplanet hybrid 10TL3, the pairings declared for this battery, and space is tight: the module is 18 cm high and weighs 30 kg. You accept 2.5 kWh usable and a 5-year warranty; if you need more later, you add modules, up to 20 kWh declared.
Choose RCT Power Battery 5.7 if…
your system runs an RCT Power Storage DC inverter (6.0, 8.0, 10.0 LAN or 12.0) and you want to start with 5.18 kWh usable and a 10-year warranty. In return you put a 78 kg, 83 cm tall column on the floor that draws 5 W at idle: about 120 Wh a day if it stays on all the time.
Where to buy
The purchase links are the same as on the two product pages and don't influence the verdict. The product pages have the complete data.