EcoFlow STREAM Pro vs Growatt ARK 20.4H-A1
Usable capacity: EcoFlow STREAM Pro –, Growatt ARK 20.4H-A1 –. Both models win equally often (2 of 5 points).
Who wins where
- EcoFlow STREAM Pro
- Growatt ARK 20.4H-A1
Biggest differences
| Fact | STREAM Pro | ARK 20.4H-A1 |
|---|---|---|
| Nominal capacity | 1.92 kWh | 20.48 kWh |
| Weight | 22.8 kg | 226 kg |
| Expandable up to | 11.52 kWh | 25.6 kWh |
| Min. operating temperature | -20 °C | -10 °C |
Score per area = position (0–100) relative to all 130 models in this category; higher is better.
| Technical specifications | EcoFlowSTREAM Pro | GrowattARK 20.4H-A1 |
|---|---|---|
| General | ||
| Cell chemistry | LFP 1 | LFP 2 |
| Smart charging on dynamic prices | Yes 1 | – |
| Wi-Fi / app | Yes 1 | – |
| Performance | ||
| Nominal capacity | 1.92 kWh 1 | 20.48 kWh ✓ 2 |
| Expandable up to | 11.52 kWh 1 | 25.6 kWh ✓ 2 |
| Charge power (continuous) | 1.05 kW 1 | – |
| Discharge power (continuous) | 1.2 kW 1 | – |
| Efficiency | ||
| Depth of discharge | – | 90 % 2 |
| Electrical | ||
| Backup power | Yes 1 | – |
| Off-grid capable | Yes 1 | – |
| Dimensions & weight | ||
| IP rating | IP65 1 | IP65 2 |
| Min. operating temperature | -20 °C ✓ 1 | -10 °C 2 |
| Width | 284 mm 1 | 650 mm 2 |
| Height | 458 mm 1 | 1,625 mm 2 |
| Depth | 255 mm 1 | 260 mm 2 |
| Weight | 22.8 kg ✓ 1 | 226 kg 2 |
| Warranty & lifespan | ||
| Warranted cycles | 6,000 1 | – |
| Warranty | 10 years 1 | 10 years 2 |
Sources
- EcoFlow STREAM Ultra/Pro Specifications, 1.0 — EcoFlow UK · accessed 29 Sept 2026
- ARK HV Battery System Datasheet, 2023 — SHENZHEN GROWATT NEW ENERGY CO.,LTD. · accessed 1 Oct 2026