EcoFlow STREAM Pro vs Fronius Reserva 15.8
Usable capacity: EcoFlow STREAM Pro –, Fronius Reserva 15.8 15.79 kWh. The Fronius Reserva 15.8 is better on 3 of 8 comparable points.
Who wins where
- EcoFlow STREAM Pro
- Fronius Reserva 15.8
Biggest differences
| Fact | STREAM Pro | Reserva 15.8 |
|---|---|---|
| Charge power (continuous) | 1.05 kW | 16.38 kW |
| Discharge power (continuous) | 1.2 kW | 16.38 kW |
| Nominal capacity | 1.92 kWh | 16.71 kWh |
| Weight | 22.8 kg | 187 kg |
Score per area = position (0–100) relative to all 130 models in this category; higher is better.
| Technical specifications | EcoFlowSTREAM Pro | FroniusReserva 15.8 |
|---|---|---|
| General | ||
| Cell chemistry | LFP 1 | LFP 2 |
| Smart charging on dynamic prices | Yes 1 | – |
| Wi-Fi / app | Yes 1 | – |
| Performance | ||
| Usable capacity | – | 15.79 kWh 2 |
| Nominal capacity | 1.92 kWh 1 | 16.71 kWh ✓ 3 |
| Expandable up to | 11.52 kWh 1 | – |
| Charge power (continuous) | 1.05 kW 1 | 16.38 kW ✓ 2 |
| Discharge power (continuous) | 1.2 kW 1 | 16.38 kW ✓ 2 |
| Efficiency | ||
| Round-trip efficiency | – | 95 % 2 |
| Electrical | ||
| Coupling | – | DC-coupled 2 |
| Backup power | Yes 1 | Yes 2 |
| Off-grid capable | Yes 1 | – |
| Dimensions & weight | ||
| IP rating | IP65 1 | IP65 2 |
| Min. operating temperature | -20 °C 1 | -20 °C 2 |
| Width | 284 mm 1 | 772 mm 2 |
| Height | 458 mm 1 | 1,640 mm 2 |
| Depth | 255 mm 1 | 176 mm 2 |
| Weight | 22.8 kg ✓ 1 | 187 kg 2 |
| Warranty & lifespan | ||
| Warranted cycles | 6,000 1 | 6,000 2 |
| Warranty | 10 years 1 | 10 years 2 |
Sources
- EcoFlow STREAM Ultra/Pro Specifications, 1.0 — EcoFlow UK · accessed 29 Sept 2026
- The Fronius storage solution, V09 Sep 2026 — Fronius International GmbH · accessed 29 Sept 2026
- CEC approved solar batteries (Australia) — Clean Energy Regulator (Australian Government), CC BY 4.0 · accessed 29 Sept 2026