E3/DC S10 X vs sonnenBatterie 10
Technical comparison · All-in-one
Two all-in-one home batteries in the same class, split by one deciding difference: the E3/DC S10 X is three-phase and keeps supplying after a brief pause in a blackout; the sonnenBatterie 10 is single-phase and has no emergency power. All figures are manufacturer-declared.
| Parameter | ||
|---|---|---|
| In brief | ||
| Usable capacity | 17.4 kWh | 5 kWh |
| Continuous output | 12000 W | 3400 W |
| Cell chemistry | LFP (lithium iron phosphate) | LFP (lithium iron phosphate) |
| Weight | 155 kg | 98 kg |
| Dimensions (W×D×H) | 61 × 44 × 141 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 | 112.3 Wh/kg | 51 Wh/kg |
| Power-to-capacity ratio | 0.69 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 | 20.6 kWh | 20 kWh |
| Phases | Three-phase | Single-phase |
| Maximum charge power | 11 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
- Backup power, three-phase EPS vs none → in a blackout the sonnenBatterie 10 does not supply the house.
- Phases, three-phase vs single-phase → the E3/DC works across all three phases of the installation, the sonnenBatterie on one.
- Usable capacity, 17.4 kWh vs 5 kWh → more than three times the energy to use before going back to the grid.
- Continuous output, 12000 W vs 3400 W (maximum charge 11 kW vs 3.4 kW) → heavy loads together stay within the E3/DC's limit; at 3.4 kW the limit comes quickly.
Which one to choose
Choose E3/DC S10 X if…
the house is three-phase, uses a lot of power and should stay supplied through a blackout. Capacity reaches 20.6 kWh with expansions. The trade-off is a 155 kg cabinet on a 61 × 44 cm base, with a 5–35 °C operating range and IP20: it belongs in a heated indoor room.
Choose sonnenBatterie 10 if…
the battery has to go somewhere narrow or cold: 27 cm deep, 98 kg, rated -5 to 45 °C with IP30. The house is single-phase. The trade-off is giving up emergency power, plus much of the starting capacity and power.
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.