All-in-one
AlphaESS
SMILE-G3
SAX Power Home 5,8 kWh
Photo from the manufacturer
All-in-one
F3 · Flat-sized (3–8 kWh)
SAX Power SAX Power Home 5,8 kWh
Price
Not available
JouleSpecs does not sell and does not show shop prices: check the price where you buy.
Data from official source
SAX Power Home 5.8 kWh is a home storage unit with LiFePO4 cells, used to complete an existing or new solar system without an additional inverter. It mounts by hanging it on a wall and wiring it up: the DC-to-AC conversion already happens in the unit, so there's no separate inverter to buy or install.
It can be read locally over Modbus RTU and Modbus TCP/UDP. During a blackout it switches automatically to backup power, cold start included. If capacity isn't enough in the future, battery modules that work at full capacity can be added, up to 17.3 kWh.
It's a single-phase model: three-phase power takes three storage units. Activating the software updates provided by the manufacturer is a condition for making warranty claims.
01 · Verified data
Technical specifications
Usable capacity
5.2 kWh
Cell chemistry
LFP (lithium iron phosphate)
Round-trip efficiency
SAX Power does not state it.
Standby consumption
4 W
| Parameter | Value | Source |
|---|---|---|
| Dimensions | 53 × 25 × 53 cm (20.9 × 9.8 × 20.9 in) | manufacturer website |
| Weight | 53.0 kg (116.8 lb) | manufacturer website |
| Usable capacity | 5.2 kWh | Declared by the brand |
| Nominal capacity | 5.76 kWh | Declared by the brand |
| Cell chemistry | LFP (lithium iron phosphate) | Declared by the brand |
| Expandable | Yes | Declared by the brand |
| Maximum expanded capacity | 17.3 kWh | Declared by the brand |
| Continuous output | 4600 W | Declared by the brand |
| Phases | Single-phase | Declared by the brand |
| Maximum charge power | 2.5 kW | Declared by the brand |
| Backup power | Full island mode | Declared by the brand |
| Backup phases | Single-phase | Declared by the brand |
| Black start | Yes | Declared by the brand |
| Rated cycles | 10000 cicli | Declared by the brand |
| Capacity at end of cycle life | 80 % | Declared by the brand |
| Warranty | 5 anni | Declared by the brand |
| Guaranteed remaining capacity | 80 % | Declared by the brand |
| Standby consumption | 4 W | Declared by the brand |
| Ingress protection | IP30 | Declared by the brand |
| Mounting | Wall mounted | Declared by the brand |
| Minimum temperature | 5 °C | Declared by the brand |
| Maximum temperature | 35 °C | Declared by the brand |
| Local control | Modbus | Declared by the brand |
| Open protocols | Modbus TCP, Modbus RTU | Declared by the brand |
| Remote updates | Mandatory | Declared by the brand |
| Declared standards | VDE-AR-N 4105, UN 38.3 | Declared by the brand |
| Depth of discharge | — | Not declared |
| Cell supplier | — | Not declared |
| Battery voltage | — | Not declared |
| Declared compatible inverters | — | Not declared |
| Grid charging | — | Not declared |
| Dynamic tariffs | — | Not declared |
| EV charger integration | — | Not declared |
| Heat pump integration | — | Not declared |
| Virtual power plant | — | Not declared |
| Guaranteed throughput | — | Not declared |
| Round-trip efficiency | — | Not declared |
| SPI index (HTW Berlin) | — | Not declared |
| HTW test power class | — | Not declared |
| HTW test edition | — | Not declared |
| Cell heating | — | Not declared |
| Noise level | — | Not declared |
| Works without internet | — | Not declared |
| Home Assistant integration | — | Not declared |
| Where the data is hosted | — | Not declared |
| App required for setup | — | Not declared |
| Battery passport | — | Not declared |
| Carbon footprint | — | Not declared |
| Recycled content | — | Not declared |
| Grid connection power | — | Not declared |
| Official list price | — | Not declared |
Which documents this page rests on
The rest of the data comes from one page on the manufacturer's site, cited row by row in the table above.
A manual or a datasheet counts as a source even when the original file is hosted elsewhere: what matters is the document, not the server. Where that happens, it is stated above.
02 · The numbers
What it really costs
Battery life cycles
1825 cycles
warranty years
- the manufacturer does not state the guaranteed total energy throughput, which for heavy users is often the limit that runs out first
How we worked it out
- stated cycles
- 10000
- warranty years
- 1825
Energy density
98.100 Wh/kg
How we worked it out
- usable capacity
- 5.200
- weight
- 53
Power-to-capacity ratio
0.880 C
How we worked it out
- continuous power
- 4600
- usable capacity
- 5.200
These numbers are calculated, not stated: they have no source to cite, they have a formula you can redo. The price used is the manufacturer's list price, which is stable and the same in every country — not a shop's price on the day.
03 · Summary
Pros and cons
In favour
- It communicates locally over Modbus RTU and Modbus TCP/UDP.
- During a blackout it switches automatically to backup power and supports cold start.
- The e-Paper display on the unit shows the main data. source
- It can be expanded with battery modules that work at full capacity, up to 17.3 kWh.
Worth knowing
- Activating the software updates provided by the manufacturer is a condition for making warranty claims.
- The ambient operating temperature range is 5–35 °C: the room has to stay within those limits.
- It's single-phase: covering a three-phase system takes three storage units.
Compare
Similar products worth weighing up
All-in-one
AlphaESS
SMILE-G3-T4~10
All-in-one
AlphaESS
SMILE5
All-in-one
Hoymiles
HiOne-(3.6-12)S-G3
Updates to this sheet and Manufacturer Notes
-
Sheet published