Fronius Reserva 6.3 vs SolaX T-BAT H 5.8 V3
Usable capacity: Fronius Reserva 6.3 6.31 kWh, SolaX T-BAT H 5.8 V3 5.5 kWh. The Fronius Reserva 6.3 is better on 4 of 8 comparable points.
Who wins where
- Fronius Reserva 6.3
- SolaX T-BAT H 5.8 V3
Biggest differences
| Fact | Reserva 6.3 | T-BAT H 5.8 V3 |
|---|---|---|
| Charge power (continuous) | 6.55 kW | 2.9 kW |
| Discharge power (continuous) | 6.55 kW | 2.9 kW |
| Min. operating temperature | -20 °C | -30 °C |
| Weight | 86.5 kg | 61.5 kg |
| Nominal capacity | 6.68 kWh | 5.8 kWh |
| Usable capacity | 6.31 kWh | 5.5 kWh |
Score per area = position (0–100) relative to all 130 models in this category; higher is better.
| Technical specifications | FroniusReserva 6.3 | SolaXT-BAT H 5.8 V3 |
|---|---|---|
| General | ||
| Cell chemistry | LFP 1 | LFP 2 |
| Performance | ||
| Usable capacity | 6.31 kWh ✓ 1 | 5.5 kWh 2 |
| Nominal capacity | 6.68 kWh ✓ 3 | 5.8 kWh 2 |
| Charge power (continuous) | 6.55 kW ✓ 1 | 2.9 kW 2 |
| Discharge power (continuous) | 6.55 kW ✓ 1 | 2.9 kW 2 |
| Peak power | – | 4 kW 2 |
| Efficiency | ||
| Round-trip efficiency | 95 % 1 | – |
| Depth of discharge | – | 95 % 2 |
| Electrical | ||
| Coupling | DC-coupled 1 | – |
| Backup power | Yes 1 | – |
| Dimensions & weight | ||
| IP rating | IP65 1 | IP66 2 |
| Min. operating temperature | -20 °C 1 | -30 °C ✓ 2 |
| Width | 772 mm 1 | 474 mm 2 |
| Height | 890 mm 1 | 715 mm 2 |
| Depth | 176 mm 1 | 150 mm 2 |
| Weight | 86.5 kg 1 | 61.5 kg ✓ 2 |
| Warranty & lifespan | ||
| Warranted cycles | 6,000 1 | 6,000 2 |
| Warranty | 10 years 1 | 10 years 2 |
Sources
- The Fronius storage solution, V09 Sep 2026 — Fronius International GmbH · accessed 29 Sept 2026
- High-voltage Battery System T-BAT H 5.8(H) V3 HV11550(H) V3 Datasheet, V1.2 — SolaX Power · accessed 29 Sept 2026
- CEC approved solar batteries (Australia) — Clean Energy Regulator (Australian Government), CC BY 4.0 · accessed 29 Sept 2026