EcoFlow STREAM Ultra X vs Zendure SolarFlow 800 Plus
Technical comparison · All-in-one
Two all-in-one batteries with LFP cells and the same 800 VA feed-in limit, but the first starts with twice the capacity. The choice is between a large wall-hung battery and a smaller, lighter one that depends on a connection. Power figures are manufacturer-declared values.
| Parameter | ||
|---|---|---|
| In brief | ||
| Nominal capacity | 3.84 kWh | 1.92 kWh |
| Cell chemistry | LFP (lithium iron phosphate) | LFP (lithium iron phosphate) |
| Cost per kWh | 468.49 €/kWh | — |
| List price | 1799 € | — |
| Weight | 38.8 kg | 21.1 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 | — |
| Warranty | 10 anni | 10 anni |
| The numbers | ||
| Cost of stored energy | 0.128 €/kWh | — |
| Energy density | 99 Wh/kg | 91 Wh/kg |
| Identity | ||
| Use tier | F3 — Flat-sized (3–8 kWh) | F2 — Room-sized (1–3 kWh) |
| Price | ||
| Price | ~1000–2200 € | — |
| Category specs | ||
| Expandable | Yes | Yes |
| Maximum expanded capacity | 23 kWh | 11.52 kWh |
| Battery voltage | 19.2 V | 48 V |
| Feed-in limit | 800 VA | 800 VA |
| Inverter included | Yes | Yes |
| Maximum solar input | 2000 W | 1500 W |
| MPPT trackers | 4 | 2 |
| Grid charging | Yes | Yes |
| Maximum charge power | 2.3 kW | 1.2 kW |
| Dynamic tariffs | Built in | — |
| Backup power | EPS (brief interruption) | — |
| Backup output | 1200 W | — |
| Ingress protection | IP65 | IP65 |
| Mounting | Wall mounted | — |
| Minimum temperature | -20 °C | -20 °C |
| Maximum temperature | 55 °C | 55 °C |
| Works without internet | With limitations | No |
| Local control | Local network | — |
| Open protocols | Matter | — |
| Home Assistant integration | — | Official |
| App required for setup | — | Yes |
| Declared standards | CE | VDE-AR-N 4105 |
The differences that matter
- Capacity: 3.84 kWh (up to 23) against 1.92 kWh (up to 11.52) → the EcoFlow covers more evening hours without adding modules.
- Solar input: 2000 W on 4 MPPT against 1500 W on 2 MPPT → the EcoFlow harvests more from roofs or balconies with panels on several strings.
- Grid charging: 2.3 kW against 1.2 kW → in a night-tariff window the EcoFlow stores more energy.
- Without internet: reduced operation against none → if the connection drops, the SolarFlow 800 Plus stops working.
Which one to choose
Choose EcoFlow STREAM Ultra X if…
you have high evening consumption and want to start at 3.84 kWh, with room to grow to 23 kWh, connecting up to 2000 W of panels across four MPPT trackers. Local network and Matter control work without going through the cloud, and in a blackout it delivers 1200 W after a short gap (EPS). The trade-off: 38.8 kg to fix to a wall.
Choose Zendure SolarFlow 800 Plus if…
1.92 kWh is enough and you want a 21.1 kg unit with an official Home Assistant integration, expandable to 11.52 kWh. You accept 1500 W of solar on two MPPT trackers, grid charging that stops at 1.2 kW, and a unit that does not work without internet; the app is needed for the first start-up.
Where to buy
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