E3/DC S10 X COMPACT vs Fronius Reserva 12.6
Usable capacity: E3/DC S10 X COMPACT 11.2 kWh, Fronius Reserva 12.6 12.63 kWh. The Fronius Reserva 12.6 is better on 4 of 5 comparable points.
Last updated: + Add a model
Both models in detail
Who wins where
- E3/DC S10 X COMPACT
- Fronius Reserva 12.6
Biggest differences
| Fact | S10 X COMPACT | Reserva 12.6 |
|---|---|---|
| Min. operating temperature | 5 °C | -20 °C |
| Charge power (continuous) | 6 kW | 12.1 kW |
| Discharge power (continuous) | 6 kW | 12.1 kW |
| Usable capacity | 11.2 kWh | 12.63 kWh |
Score per area = position (0–100) relative to all 140 models in this category; higher is better.
| Technical specifications | E3/DCS10 X COMPACT | FroniusReserva 12.6 |
|---|---|---|
| General | ||
| Cell chemistry | LFP1 | LFP2 |
| Smart charging on dynamic prices | Yes1 | – |
| Performance | ||
| Usable capacity | 11.2 kWh1 | 12.63 kWh✓2 |
| Nominal capacity | – | 13.37 kWh3 |
| Charge power (continuous) | 6 kW1 | 12.1 kW✓2 |
| Discharge power (continuous) | 6 kW1 | 12.1 kW✓2 |
| Efficiency | ||
| Round-trip efficiency | – | 95 %2 |
| Electrical | ||
| Coupling | – | DC-coupled2 |
| Phases | 31 | – |
| Backup power | – | Yes2 |
| Dimensions & weight | ||
| IP rating | IP201 | IP652 |
| Min. operating temperature | 5 °C1 | -20 °C✓2 |
| Width | 590 mm1 | 772 mm2 |
| Height | – | 1,390 mm2 |
| Depth | 500 mm1 | 176 mm2 |
| Weight | – | 153.5 kg2 |
| Warranty & lifespan | ||
| Warranted cycles | – | 6,0002 |
| Warranty | 10 years1 | 10 years2 |
Frequently asked questions
Which is better: the E3/DC S10 X COMPACT or the Fronius Reserva 12.6?
Usable capacity: E3/DC S10 X COMPACT 11.2 kWh, Fronius Reserva 12.6 12.63 kWh. The Fronius Reserva 12.6 is better on 4 of 5 comparable points.
What is the usable capacity of the E3/DC S10 X COMPACT and the Fronius Reserva 12.6?
E3/DC S10 X COMPACT: 11.2 kWh. Fronius Reserva 12.6: 12.63 kWh.
Which is better on min. operating temperature: the E3/DC S10 X COMPACT or the Fronius Reserva 12.6?
Fronius Reserva 12.6: -20 °C. E3/DC S10 X COMPACT: 5 °C.
Which is better on charge power (continuous): the E3/DC S10 X COMPACT or the Fronius Reserva 12.6?
Fronius Reserva 12.6: 12.1 kW. E3/DC S10 X COMPACT: 6 kW.
Related comparisons
How we collect and check this data →
Sources
- Technische Daten Hauskraftwerk S10 X (Aufbauvariante COMPACT), 25. September 2026 — HagerEnergy GmbH · accessed Sep 29, 2026
- The Fronius storage solution, V09 Sep 2026 — Fronius International GmbH · accessed Sep 29, 2026
- CEC approved solar batteries (Australia) — Clean Energy Regulator (Australian Government), CC BY 4.0 · accessed Sep 29, 2026