EcoFlow STREAM Ultra X vs Jackery SolarVault 3 Pro Max
Technical comparison · All-in-one
Two balcony systems feeding in at 800 VA: the STREAM Ultra X hangs on a wall, has more capacity and integrates with Matter and the local network; the SolarVault 3 Pro Max stands on the floor, takes twice the panels and switches over without a pause. Figures are manufacturer-declared.
| Parameter | ||
|---|---|---|
| In brief | ||
| Nominal capacity | 3.84 kWh | 2.52 kWh |
| Cell chemistry | LFP (lithium iron phosphate) | LFP (lithium iron phosphate) |
| Cost per kWh | 468.49 €/kWh | 287.7 €/kWh |
| List price | 1799 € | 725 € |
| Weight | 38.8 kg | 26.5 kg |
| How long it lasts | ||
| Battery life cycles | 3650 cicli | 3650 cicli |
| The limit that runs out first | anni di garanzia | anni di garanzia |
| Rated cycles | 6000 cicli | 6000 cicli |
| Capacity at end of cycle life | — | 70 % |
| Warranty | 10 anni | 10 anni |
| The numbers | ||
| Cost of stored energy | 0.128 €/kWh | 0.079 €/kWh |
| Energy density | 99 Wh/kg | 95.1 Wh/kg |
| Identity | ||
| Use tier | F3 — Flat-sized (3–8 kWh) | F2 — Room-sized (1–3 kWh) |
| Price | ||
| Price | ~1000–2200 € | ~450–1000 € |
| Universal specs | ||
| Voltage | — | 230 V |
| Category specs | ||
| Depth of discharge | — | 90 % |
| Expandable | Yes | Yes |
| Maximum expanded capacity | 23 kWh | 15.12 kWh |
| Battery voltage | 19.2 V | 41.6 V |
| Feed-in limit | 800 VA | 800 VA |
| Inverter included | Yes | — |
| Maximum solar input | 2000 W | 4000 W |
| MPPT trackers | 4 | 4 |
| Grid charging | Yes | Yes |
| Maximum charge power | 2.3 kW | 3.68 kW |
| Dynamic tariffs | Built in | Built in |
| Backup power | EPS (brief interruption) | UPS |
| Backup output | 1200 W | 1600 W |
| Switchover time | — | 20 ms |
| Ingress protection | IP65 | IP65 |
| Mounting | Wall mounted | Floor standing |
| Minimum temperature | -20 °C | -20 °C |
| Maximum temperature | 55 °C | 55 °C |
| Cell heating | — | Yes |
| Works without internet | With limitations | With limitations |
| Local control | Local network | — |
| Open protocols | Matter | — |
| Declared standards | CE | VDE-AR-N 4105, IEC 62619 |
The differences that matter
- Capacity, about 3.84 kWh vs about 2.5 kWh → the STREAM holds more energy for the evening, with expansion up to 23 kWh against 15.12 kWh.
- Solar input, 2000 W vs 4000 W → the SolarVault 3 connects twice the panels.
- Backup, EPS 1200 W vs UPS 1600 W in 20 ms → only the SolarVault 3 switches without a pause, and at higher power.
- Mounting, wall vs floor → the STREAM must go on a wall that carries 38.8 kg; the SolarVault 3 stands on the ground.
Which one to choose
Choose EcoFlow STREAM Ultra X if…
you want to fit it into a smart home and fix it to the wall: local-network control and Matter, about 3.84 kWh expandable to 23 kWh. You accept 2000 W of solar input, 1200 W of backup with a short pause (EPS) and 38.8 kg to hang.
Choose Jackery SolarVault 3 Pro Max if…
you have plenty of panels and want appliances to stay on in a blackout: 4000 W of solar input, UPS up to 1600 W with a 20 ms switchover, charging up to 3.68 kW and cell heating. You start from about 2.5 kWh and expansion reaches 15.12 kWh instead of 23.
Where to buy
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