Deye AI-W5.1-12P3-EU-B vs Fronius Reserva 6.3
Usable capacity: Deye AI-W5.1-12P3-EU-B 5.12 kWh, Fronius Reserva 6.3 6.31 kWh. Both models win equally often (2 of 7 points).
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Both models in detail
Who wins where
- Deye AI-W5.1-12P3-EU-B
- Fronius Reserva 6.3
Biggest differences
| Fact | AI-W5.1-12P3-EU-B | Reserva 6.3 |
|---|---|---|
| Weight | 53 kg | 86.5 kg |
| Nominal capacity | 5.12 kWh | 6.68 kWh |
| Usable capacity | 5.12 kWh | 6.31 kWh |
Score per area = position (0–100) relative to all 140 models in this category; higher is better.
| Technical specifications | DeyeAI-W5.1-12P3-EU-B | FroniusReserva 6.3 |
|---|---|---|
| General | ||
| Cell chemistry | LFP1 | LFP2 |
| Wi-Fi / app | Yes1 | – |
| Performance | ||
| Usable capacity | 5.12 kWh1 | 6.31 kWh✓2 |
| Nominal capacity | 5.12 kWh1 | 6.68 kWh✓3 |
| Expandable up to | 184 kWh1 | – |
| Charge power (continuous) | – | 6.55 kW2 |
| Discharge power (continuous) | – | 6.55 kW2 |
| Efficiency | ||
| Round-trip efficiency | 95.5 %✓1 | 95 %2 |
| Electrical | ||
| Coupling | – | DC-coupled2 |
| Backup power | – | Yes2 |
| Off-grid capable | Yes1 | – |
| Dimensions & weight | ||
| IP rating | IP651 | IP652 |
| Min. operating temperature | -20 °C1 | -20 °C2 |
| Width | 720 mm1 | 772 mm2 |
| Height | 300 mm1 | 890 mm2 |
| Depth | 255 mm1 | 176 mm2 |
| Weight | 53 kg✓1 | 86.5 kg2 |
| Warranty & lifespan | ||
| Warranted cycles | 6,0001 | 6,0002 |
| Warranty | 10 years1 | 10 years2 |
Frequently asked questions
Which is better: the Deye AI-W5.1-12P3-EU-B or the Fronius Reserva 6.3?
Usable capacity: Deye AI-W5.1-12P3-EU-B 5.12 kWh, Fronius Reserva 6.3 6.31 kWh. Both models win equally often (2 of 7 points).
What is the usable capacity of the Deye AI-W5.1-12P3-EU-B and the Fronius Reserva 6.3?
Deye AI-W5.1-12P3-EU-B: 5.12 kWh. Fronius Reserva 6.3: 6.31 kWh.
Which is better on weight: the Deye AI-W5.1-12P3-EU-B or the Fronius Reserva 6.3?
Deye AI-W5.1-12P3-EU-B: 53 kg. Fronius Reserva 6.3: 86.5 kg.
Which is better on nominal capacity: the Deye AI-W5.1-12P3-EU-B or the Fronius Reserva 6.3?
Fronius Reserva 6.3: 6.68 kWh. Deye AI-W5.1-12P3-EU-B: 5.12 kWh.
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How we collect and check this data →
Sources
- AI-W5.1-5/6/8/10/12P3-EU-B-ESS All-in-one Energy Storage System, V3.0 — NINGBO DEYE ESS TECHNOLOGY CO., LTD · accessed 17 Oct 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