Enphase IQ Battery 5P with FlexPhase vs Fronius Reserva 6.3
Usable capacity: Enphase IQ Battery 5P with FlexPhase 5 kWh, Fronius Reserva 6.3 6.31 kWh. Both models win equally often (2 of 7 points).
Who wins where
- Enphase IQ Battery 5P with FlexPhase
- Fronius Reserva 6.3
Biggest differences
| Fact | IQ Battery 5P with FlexPhase | Reserva 6.3 |
|---|---|---|
| Warranty | 15 years | 10 years |
| Usable capacity | 5 kWh | 6.31 kWh |
| Round-trip efficiency | 90 % | 95 % |
| Weight | 83 kg | 86.5 kg |
Score per area = position (0–100) relative to all 130 models in this category; higher is better.
| Technical specifications | EnphaseIQ Battery 5P with FlexPhase | FroniusReserva 6.3 |
|---|---|---|
| General | ||
| Cell chemistry | LFP 1 | LFP 2 |
| Wi-Fi / app | Yes 1 | – |
| Performance | ||
| Usable capacity | 5 kWh 1 | 6.31 kWh ✓ 2 |
| Nominal capacity | – | 6.68 kWh 3 |
| Charge power (continuous) | – | 6.55 kW 2 |
| Discharge power (continuous) | – | 6.55 kW 2 |
| Efficiency | ||
| Round-trip efficiency | 90 % 1 | 95 % ✓ 2 |
| Electrical | ||
| Coupling | AC-coupled 1 | DC-coupled 2 |
| Phases | 3 1 | – |
| Backup power | Yes 1 | Yes 2 |
| Dimensions & weight | ||
| IP rating | IP55 1 | IP65 2 |
| Min. operating temperature | -20 °C 1 | -20 °C 2 |
| Width | 550 mm 1 | 772 mm 2 |
| Height | 980 mm 1 | 890 mm 2 |
| Depth | 188 mm 1 | 176 mm 2 |
| Weight | 83 kg ✓ 1 | 86.5 kg 2 |
| Warranty & lifespan | ||
| Warranted cycles | 6,000 1 | 6,000 2 |
| Warranty | 15 years ✓ 1 | 10 years 2 |
Sources
- IQ Battery 5P with FlexPhase – EMEA data sheet, DSH-00477-9.0-EN-2026-08-21 — Enphase Energy, Inc. · accessed 27 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