Energy Depot DOMUS 2.5 vs RCT Power Battery 7.6
Technical comparison · High voltage
A low 2.5 kWh module against a 6.91 kWh column: the two are not meant for the same system, and each connects to different inverters. The choice starts there. Manufacturer-declared values.
| Parameter | ||
|---|---|---|
| In brief | ||
| Usable capacity | 2.5 kWh | 6.91 kWh |
| Cell chemistry | LFP (lithium iron phosphate) | LFP (lithium iron phosphate) |
| Weight | 30 kg | 102 kg |
| Dimensions (W×D×H) | 44 × 32.8 × 18 cm | 34 × 34 × 106 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 | 67.7 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 | 15.36 kWh |
| Battery voltage | 51.2 V | 307 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 (307 V nominali, 240-346 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
- Usable capacity, 2.5 vs 6.91 kWh → the RCT covers on its own what the Domus reaches with more modules, up to 20 kWh against 15.36 kWh.
- Standby draw, 0.05 vs 5 W → 5 W running continuously is in theory about 44 kWh a year, against less than 0.5 kWh.
- Shape and weight, 30 kg in 44 × 32.8 × 18 cm vs 102 kg in 34 × 34 × 106 cm → one is flat and light, the other a column that needs more careful placement.
- Warranty, 5 vs 10 years → the RCT stays covered twice as long.
Which one to choose
Choose Energy Depot DOMUS 2.5 if…
A small system with a CENTURIO or KACO blueplanet hybrid 10TL3 inverter, in a room with no height to spare: 44 × 32.8 × 18 cm and 30 kg, 2.5 kWh expandable to 20. Standby draw is 0.05 W. You accept a 5-year warranty and IP21, so a dry indoor space.
Choose RCT Power Battery 7.6 if…
A home that wants 6.91 kWh usable from day one with an RCT Power Storage DC inverter and a 10-year warranty. It is a 34 × 34 × 106 cm column weighing 102 kg, with a 5 W standby draw; it expands to 15.36 kWh.
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.