Fronius Reserva 15.8 vs Growatt ARK 20.4L
Usable capacity: Fronius Reserva 15.8 15.79 kWh, Growatt ARK 20.4L 18.43 kWh. The Fronius Reserva 15.8 is better on 4 of 7 comparable points.
Who wins where
- Fronius Reserva 15.8
- Growatt ARK 20.4L
Biggest differences
| Fact | Reserva 15.8 | ARK 20.4L |
|---|---|---|
| Charge power (continuous) | 16.38 kW | 5 kW |
| Discharge power (continuous) | 16.38 kW | 5 kW |
| Min. operating temperature | -20 °C | -10 °C |
| Nominal capacity | 16.71 kWh | 20.48 kWh |
| Weight | 187 kg | 224 kg |
| Usable capacity | 15.79 kWh | 18.43 kWh |
Score per area = position (0–100) relative to all 130 models in this category; higher is better.
| Technical specifications | FroniusReserva 15.8 | GrowattARK 20.4L |
|---|---|---|
| General | ||
| Cell chemistry | LFP 1 | LFP 2 |
| Performance | ||
| Usable capacity | 15.79 kWh 1 | 18.43 kWh ✓ 2 |
| Nominal capacity | 16.71 kWh 3 | 20.48 kWh ✓ 2 |
| Charge power (continuous) | 16.38 kW ✓ 1 | 5 kW 2 |
| Discharge power (continuous) | 16.38 kW ✓ 1 | 5 kW 2 |
| Efficiency | ||
| Round-trip efficiency | 95 % 1 | – |
| Electrical | ||
| Coupling | DC-coupled 1 | – |
| Backup power | Yes 1 | – |
| Dimensions & weight | ||
| IP rating | IP65 1 | IP65 2 |
| Min. operating temperature | -20 °C ✓ 1 | -10 °C 2 |
| Width | 772 mm 1 | 650 mm 2 |
| Height | 1,640 mm 1 | 1,445 mm 2 |
| Depth | 176 mm 1 | 260 mm 2 |
| Weight | 187 kg ✓ 1 | 224 kg 2 |
| Warranty & lifespan | ||
| Warranted cycles | 6,000 1 | – |
| Warranty | 10 years 1 | 10 years 2 |
Sources
- The Fronius storage solution, V09 Sep 2026 — Fronius International GmbH · accessed 29 Sept 2026
- ARK LV Battery System, zonder versienummer — SHENZHEN GROWATT NEW ENERGY CO.,LTD. · accessed 1 Oct 2026
- CEC approved solar batteries (Australia) — Clean Energy Regulator (Australian Government), CC BY 4.0 · accessed 29 Sept 2026