BYD Battery-Box Premium HVS 7.7 vs Fronius Reserva 6.3
Usable capacity: BYD Battery-Box Premium HVS 7.7 7.68 kWh, Fronius Reserva 6.3 6.31 kWh. Both models win equally often (2 of 6 points).
Who wins where
- BYD Battery-Box Premium HVS 7.7
- Fronius Reserva 6.3
Biggest differences
| Fact | Battery-Box Premium HVS 7.7 | Reserva 6.3 |
|---|---|---|
| Min. operating temperature | -10 °C | -20 °C |
| Weight | 129 kg | 86.5 kg |
| Usable capacity | 7.68 kWh | 6.31 kWh |
Score per area = position (0–100) relative to all 130 models in this category; higher is better.
| Technical specifications | BYDBattery-Box Premium HVS 7.7 | FroniusReserva 6.3 |
|---|---|---|
| General | ||
| Cell chemistry | LFP 1 | LFP 2 |
| Performance | ||
| Usable capacity | 7.68 kWh ✓ 1 | 6.31 kWh 2 |
| Nominal capacity | – | 6.68 kWh 3 |
| Expandable up to | 38.4 kWh 1 | – |
| Charge power (continuous) | – | 6.55 kW 2 |
| Discharge power (continuous) | – | 6.55 kW 2 |
| Efficiency | ||
| Round-trip efficiency | 96 % ✓ 1 | 95 % 2 |
| Electrical | ||
| Coupling | – | DC-coupled 2 |
| Backup power | Yes 1 | Yes 2 |
| Off-grid capable | Yes 1 | – |
| Dimensions & weight | ||
| IP rating | IP55 1 | IP65 2 |
| Min. operating temperature | -10 °C 1 | -20 °C ✓ 2 |
| Width | 585 mm 1 | 772 mm 2 |
| Height | 995 mm 1 | 890 mm 2 |
| Depth | 298 mm 1 | 176 mm 2 |
| Weight | 129 kg 1 | 86.5 kg ✓ 2 |
| Warranty & lifespan | ||
| Warranted cycles | – | 6,000 2 |
| Warranty | 10 years 1 | 10 years 2 |
Sources
- Battery-Box Premium HVS – datasheet, BCU2.0 V1.0 EN (28.03.2025) — BYD Lithium Battery Co., Ltd. · 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