E3/DC S10 X Compact vs sonnenBatterie 10
Technical comparison · All-in-one
Two high-end all-in-one home batteries. The E3/DC S10 X Compact is the more powerful and larger of the two, but stops at 11.2 kWh even when expanded; the sonnenBatterie 10 reaches 20 kWh, single-phase and without emergency power. All figures are manufacturer-declared.
| Parameter | ||
|---|---|---|
| In brief | ||
| Usable capacity | 8.25 kWh | 5 kWh |
| Continuous output | 12000 W | 3400 W |
| Cell chemistry | LFP (lithium iron phosphate) | LFP (lithium iron phosphate) |
| Weight | 130 kg | 98 kg |
| Dimensions (W×D×H) | 59 × 50 × 120 cm | 69 × 27 × 172 cm |
| How long it lasts | ||
| Battery life cycles | 3650 cicli | 3650 cicli |
| The limit that runs out first | anni di garanzia | anni di garanzia |
| Rated cycles | — | 10000 cicli |
| Warranty | 10 anni | 10 anni |
| Guaranteed remaining capacity | 80 % | — |
| The numbers | ||
| Energy density | 63.5 Wh/kg | 51 Wh/kg |
| Power-to-capacity ratio | 1.45 C | 0.68 C |
| Identity | ||
| Use tier | F4 — House-sized (8–20 kWh) | F4 — House-sized (8–20 kWh) |
| Universal specs | ||
| Voltage | 230 V | — |
| Category specs | ||
| Expandable | Yes | Yes |
| Maximum expanded capacity | 11.2 kWh | 20 kWh |
| Phases | Three-phase | Single-phase |
| Maximum charge power | 6 kW | 3.4 kW |
| Backup power | EPS (brief interruption) | None |
| Backup phases | Three-phase | None |
| Grid charging | Yes | Yes |
| Dynamic tariffs | Built in | Built in |
| EV charger integration | — | Yes |
| Heat pump integration | Yes | — |
| Ingress protection | IP20 | IP30 |
| Minimum temperature | 5 °C | -5 °C |
| Maximum temperature | 35 °C | 45 °C |
| Works without internet | Fully | — |
| Local control | Modbus | — |
| Open protocols | Modbus TCP, CAN bus, EEBus | — |
| Declared standards | CE, UN 38.3, VDE-AR-N 4105, IEC 62619, VDE 2510-50 | VDE-AR-N 4105, CEI 0-21, UN 38.3, IEC 62619, VDE 2510-50 |
The differences that matter
- Continuous output, 12000 W vs 3400 W (maximum charge 6 kW vs 3.4 kW) → heavy loads together stay within the E3/DC's limit.
- Usable capacity, 8.25 kWh vs 5 kWh → more energy to use before going back to the grid.
- Maximum expanded capacity, 11.2 kWh vs 20 kWh → the room to grow is the sonnenBatterie 10's.
- Phases and backup, three-phase with EPS vs single-phase without → in a blackout only the E3/DC supplies the house.
Which one to choose
Choose E3/DC S10 X Compact if…
the house is three-phase, has heavy evening consumption and you want continuity in a blackout, in an indoor room: 59 × 50 cm footprint. The trade-off is a 5–35 °C operating range with IP20 and a lower expansion ceiling.
Choose sonnenBatterie 10 if…
the house is single-phase and the room is cold or narrow: 27 cm deep, rated -5 to 45 °C with IP30, 98 kg against 130 kg. The trade-off is no emergency power and less output.
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.