SAX Power Home 5,8 kWh vs sonnenBatterie 10
Technical comparison · All-in-one
Two single-phase batteries of about 5 kWh with LFP cells: capacity is practically the same, and what decides is whether the house has to stay powered during an outage. SAX Power Home 5,8 kWh does it in full island mode; sonnenBatterie 10 has no backup, but comes with a ten-year warranty instead of five.
| Parameter | ||
|---|---|---|
| In brief | ||
| Usable capacity | 5.2 kWh | 5 kWh |
| Continuous output | 4600 W | 3400 W |
| Cell chemistry | LFP (lithium iron phosphate) | LFP (lithium iron phosphate) |
| Weight | 53 kg | 98 kg |
| Dimensions (W×D×H) | 53 × 25 × 53 cm | 69 × 27 × 172 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 | 10000 cicli | 10000 cicli |
| Capacity at end of cycle life | 80 % | — |
| Warranty | 5 anni | 10 anni |
| Guaranteed remaining capacity | 80 % | — |
| The numbers | ||
| Energy density | 98.1 Wh/kg | 51 Wh/kg |
| Power-to-capacity ratio | 0.88 C | 0.68 C |
| Identity | ||
| Use tier | F3 — Flat-sized (3–8 kWh) | F4 — House-sized (8–20 kWh) |
| Category specs | ||
| Expandable | Yes | Yes |
| Maximum expanded capacity | 17.3 kWh | 20 kWh |
| Phases | Single-phase | Single-phase |
| Maximum charge power | 2.5 kW | 3.4 kW |
| Backup power | Full island mode | None |
| Backup phases | Single-phase | None |
| Black start | Yes | — |
| Grid charging | — | Yes |
| Dynamic tariffs | — | Built in |
| EV charger integration | — | Yes |
| Standby consumption | 4 W | — |
| Ingress protection | IP30 | IP30 |
| Mounting | Wall mounted | — |
| Minimum temperature | 5 °C | -5 °C |
| Maximum temperature | 35 °C | 45 °C |
| Local control | Modbus | — |
| Open protocols | Modbus TCP, Modbus RTU | — |
| Remote updates | Mandatory | — |
| Declared standards | VDE-AR-N 4105, UN 38.3 | VDE-AR-N 4105, CEI 0-21, UN 38.3, IEC 62619, VDE 2510-50 |
The differences that matter
- Backup → single-phase full island mode with restart without grid against none: only SAX Power Home 5,8 kWh keeps working during an outage.
- Warranty → 5 years against 10: estimated service life follows the warranty (1825 cycles against 3650), not the 10000 cycles both declare.
- Continuous power → 4.6 kW against 3.4 kW (manufacturer-declared values): SAX runs more loads together, sonnenBatterie 10 charges faster (3.4 kW against 2.5 kW).
- Footprint → 53 × 25 × 53 cm and 53 kg against 69 × 27 × 172 cm and 98 kg: the wall space needed changes.
Which one to choose
Choose SAX Power Home 5,8 kWh if…
the house has to run disconnected from the grid and restart even without it: single-phase full island mode with restart without grid. It mounts on the wall (53 kg) and is controlled locally over Modbus TCP or RTU. The trade-off: a five-year warranty, charging up to 2.5 kW, mandatory remote updates and an operating range of 5 to 35 °C.
Choose sonnenBatterie 10 if…
a longer warranty and integration with grid charging, time-of-use tariffs and the wallbox matter more: ten years of warranty, charging up to 3.4 kW, expansion up to 20 kWh. The trade-off: no backup power, so in an outage the house is without electricity. It weighs 98 kg against 53 kg and stands 172 cm tall.
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.