Alpha ESS SMILE-G3-S5 vs EcoFlow STREAM Pro
Usable capacity: Alpha ESS SMILE-G3-S5 3.8 kWh, EcoFlow STREAM Pro –. The Alpha ESS SMILE-G3-S5 is better on 4 of 8 comparable points.
Who wins where
- Alpha ESS SMILE-G3-S5
- EcoFlow STREAM Pro
Biggest differences
| Fact | SMILE-G3-S5 | STREAM Pro |
|---|---|---|
| Charge power (continuous) | 5 kW | 1.05 kW |
| Discharge power (continuous) | 5 kW | 1.2 kW |
| Expandable up to | 38.4 kWh | 11.52 kWh |
| Nominal capacity | 4 kWh | 1.92 kWh |
Score per area = position (0–100) relative to all 130 models in this category; higher is better.
| Technical specifications | Alpha ESSSMILE-G3-S5 | EcoFlowSTREAM Pro |
|---|---|---|
| General | ||
| Cell chemistry | LFP 1 | LFP 2 |
| Smart charging on dynamic prices | – | Yes 2 |
| Wi-Fi / app | Yes 1 | Yes 2 |
| Performance | ||
| Usable capacity | 3.8 kWh 1 | – |
| Nominal capacity | 4 kWh ✓ 1 | 1.92 kWh 2 |
| Expandable up to | 38.4 kWh ✓ 1 | 11.52 kWh 2 |
| Charge power (continuous) | 5 kW ✓ 1 | 1.05 kW 2 |
| Discharge power (continuous) | 5 kW ✓ 1 | 1.2 kW 2 |
| Efficiency | ||
| Depth of discharge | 95 % 1 | – |
| Electrical | ||
| Coupling | DC-coupled 1 | – |
| Backup power | Yes 1 | Yes 2 |
| Off-grid capable | Yes 1 | Yes 2 |
| Dimensions & weight | ||
| IP rating | IP65 1 | IP65 2 |
| Min. operating temperature | – | -20 °C 2 |
| Width | – | 284 mm 2 |
| Height | – | 458 mm 2 |
| Depth | – | 255 mm 2 |
| Weight | – | 22.8 kg 2 |
| Warranty & lifespan | ||
| Warranted cycles | – | 6,000 2 |
| Warranty | 10 years 1 | 10 years 2 |
Sources
- Alpha ESS SMILE-G3-S3.6 / S5 / B5 Datasheet, V01.13122024 — Alpha ESS Co., Ltd. · accessed 29 Sept 2026
- EcoFlow STREAM Ultra/Pro Specifications, 1.0 — EcoFlow UK · accessed 29 Sept 2026