E3/DC S10 X vs sonnenBatterie 10 performance
Technical comparison · All-in-one
Two three-phase home batteries, for the same class of installation. What separates them is what happens when the grid is gone and how far they can grow: E3/DC S10 X has three-phase backup and works fully without internet, sonnenBatterie 10 performance has no backup and expands to 50 kWh. Figures are manufacturer-declared.
| Parameter | ||
|---|---|---|
| In brief | ||
| Usable capacity | 17.4 kWh | 10 kWh |
| Continuous output | 12000 W | 7000 W |
| Cell chemistry | LFP (lithium iron phosphate) | LFP (lithium iron phosphate) |
| Weight | 155 kg | 165 kg |
| Dimensions (W×D×H) | 61 × 44 × 141 cm | 69 × 36 × 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 | 60.6 Wh/kg |
| Power-to-capacity ratio | 0.69 C | 0.7 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 | 50 kWh |
| Phases | Three-phase | Three-phase |
| Maximum charge power | 11 kW | 7 kW |
| Backup power | EPS (brief interruption) | None |
| Backup phases | Three-phase | None |
| Grid charging | Yes | — |
| Dynamic tariffs | Built in | — |
| EV charger integration | — | Yes |
| Heat pump integration | Yes | — |
| Virtual power plant | — | sonnenVPP |
| 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, UN 38.3, IEC 62619, VDE 2510-50 |
The differences that matter
- Backup: three-phase with a brief gap (EPS) → none: in an outage only the E3/DC S10 X keeps all three phases supplied.
- Maximum expansion: 20.6 kWh → 50 kWh: sonnenBatterie leaves more room for an installation that grows.
- Open protocols: Modbus TCP, CAN bus, EEBus (E3/DC): the battery integrates with an external energy management system.
- IP20, 5 to 35 °C → IP30, -5 to 45 °C: sonnenBatterie tolerates a less controlled room.
Which one to choose
Choose E3/DC S10 X if…
you want 17.4 kWh usable and 12 kW continuous, charging at up to 11 kW, and the house must stay powered without the grid and without internet, with local control over Modbus and a link to the heat pump. The trade-off: IP20 and a 5 to 35 °C range, so a temperature-controlled indoor room.
Choose sonnenBatterie 10 performance if…
you start at 10 kWh usable and 7 kW continuous and expect to grow; you want the link to the EV charger and entry into the sonnenVPP virtual power plant. The trade-off: no backup power, so without the grid the house stays dark.
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.