E3/DC S10 X Compact vs SAX Power Home 5,8 kWh
Technical comparison · All-in-one
These are not the same kind of installation: E3/DC S10 X Compact is three-phase, SAX Power Home 5.8 kWh is single-phase and wall-mounted. What decides is the home's supply and, with it, the type of backup: a brief gap on three phases or a full island on one. Figures are manufacturer-declared.
| Parameter | ||
|---|---|---|
| In brief | ||
| Usable capacity | 8.25 kWh | 5.2 kWh |
| Continuous output | 12000 W | 4600 W |
| Cell chemistry | LFP (lithium iron phosphate) | LFP (lithium iron phosphate) |
| Weight | 130 kg | 53 kg |
| Dimensions (W×D×H) | 59 × 50 × 120 cm | 53 × 25 × 53 cm |
| How long it lasts | ||
| Battery life cycles | 3650 cicli | 1825 cicli |
| The limit that runs out first | anni di garanzia | anni di garanzia |
| Rated cycles | — | 10000 cicli |
| Capacity at end of cycle life | — | 80 % |
| Warranty | 10 anni | 5 anni |
| Guaranteed remaining capacity | 80 % | 80 % |
| The numbers | ||
| Energy density | 63.5 Wh/kg | 98.1 Wh/kg |
| Power-to-capacity ratio | 1.45 C | 0.88 C |
| Identity | ||
| Use tier | F4 — House-sized (8–20 kWh) | F3 — Flat-sized (3–8 kWh) |
| Universal specs | ||
| Voltage | 230 V | — |
| Category specs | ||
| Expandable | Yes | Yes |
| Maximum expanded capacity | 11.2 kWh | 17.3 kWh |
| Phases | Three-phase | Single-phase |
| Maximum charge power | 6 kW | 2.5 kW |
| Backup power | EPS (brief interruption) | Full island mode |
| Backup phases | Three-phase | Single-phase |
| Black start | — | Yes |
| Grid charging | Yes | — |
| Dynamic tariffs | Built in | — |
| Heat pump integration | Yes | — |
| Standby consumption | — | 4 W |
| Ingress protection | IP20 | IP30 |
| Mounting | — | Wall mounted |
| Minimum temperature | 5 °C | 5 °C |
| Maximum temperature | 35 °C | 35 °C |
| Works without internet | Fully | — |
| Local control | Modbus | Modbus |
| Open protocols | Modbus TCP, CAN bus, EEBus | Modbus TCP, Modbus RTU |
| Remote updates | — | Mandatory |
| Declared standards | CE, UN 38.3, VDE-AR-N 4105, IEC 62619, VDE 2510-50 | VDE-AR-N 4105, UN 38.3 |
The differences that matter
- Phases and backup: three-phase with a brief gap (EPS) → single-phase full island: the first keeps three phases supplied with a short interruption, the second one phase in full island mode.
- Warranty: 10 years → 5 years: the first is covered for twice as long.
- Restart without grid (SAX): SAX declares the system can start again even when the grid is absent.
- Maximum expansion: 11.2 kWh → 17.3 kWh: SAX has more room to grow.
Which one to choose
Choose E3/DC S10 X Compact if…
the house is three-phase and you want 12 kW continuous and 6 kW charging on 8.25 kWh usable, with a link to the heat pump and full operation even without internet. The trade-off: 130 kg and IP20 in an indoor room, and more limited expansion.
Choose SAX Power Home 5,8 kWh if…
the installation is single-phase and you want a 53 kg wall-mounted unit with 5.2 kWh usable, full-island backup and restart without the grid; it draws 4 W at idle. The trade-off: 4.6 kW continuous and 2.5 kW charging, a shorter warranty and mandatory remote updates.
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.