Photo from the manufacturer
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EcoFlow DELTA Pro Ultra is a modular storage system: an inverter and a battery, sold together as the minimum unit, which grows by adding more identical batteries up to thirty kilowatt-hours on a single inverter. The chemistry is lithium iron phosphate, and below zero the pack heats itself to keep charging — the heating can only be turned off from the app.
When the grid is missing, the switch to the battery is that of a true uninterruptible power supply: whatever's connected doesn't notice. It charges from the sun on a high-voltage input, from the grid or from a generator, and the app adds remote control.
The inverter comes on a caster base, but its place is on the ground near the electrical panel, not in a backpack; and resistance to dust and rain only holds with every port closed. It's for anyone who already has the panels and wants to disconnect from the grid when it pays off, or for anyone who has to carry the home through a long outage.
Highest technical score among the 4 sheets in the High capacity category (flat-sized tier): 86/100.
How we assign awards →official manufacturer list price — on nominal capacity
| Parameter | Value | Source |
|---|---|---|
| Power supply | 220-240 V / 50-60 Hz | manufacturer website |
| Nominal capacity | 6.144 kWh | Declared by the brand |
| Cell chemistry | LFP (lithium iron phosphate) | Declared by the brand |
| Expandable | Yes | Declared by the brand |
| Maximum expanded capacity | 30 kWh | Declared by the brand |
| Continuous output | 6900 W | Declared by the brand |
| AC outlets | 5 | Declared by the brand |
| Fastest USB-C | 100 W | Declared by the brand |
| Maximum solar input | 4000 W | Declared by the brand |
| Backup power | UPS | Declared by the brand |
| Switchover time | 20 ms | Declared by the brand |
| Rated cycles | 3500 cicli | Declared by the brand |
| Capacity at end of cycle life | 80 % | Declared by the brand |
| Warranty | 5 anni | Declared by the brand |
| Ingress protection | IP54 | Declared by the brand |
| Mounting | Portable | Declared by the brand |
| Minimum temperature | -20 °C | Declared by the brand |
| Maximum temperature | 45 °C | Declared by the brand |
| Cell heating | Yes | Declared by the brand |
| Noise level | 30 dB | Declared by the brand |
| Wheels and handle | Yes | Declared by the brand |
| Declared standards | CE, IEC 62619, IEC 62477 | Declared by the brand |
| Official list price | 5098 € | Declared by the brand |
| Usable capacity | — | Not declared |
| Depth of discharge | — | Not declared |
| Cell supplier | — | Not declared |
| Peak output | — | Not declared |
| Peak duration | — | Not declared |
| Maximum charge power | — | Not declared |
| 0–80% charge time | — | Not declared |
| Guaranteed throughput | — | Not declared |
| Guaranteed remaining capacity | — | Not declared |
| Round-trip efficiency | — | Not declared |
| Standby consumption | — | Not declared |
| Works without internet | — | Not declared |
| Local control | — | Not declared |
| Open protocols | — | Not declared |
| Home Assistant integration | — | Not declared |
| Where the data is hosted | — | Not declared |
| Remote updates | — | Not declared |
| App required for setup | — | Not declared |
These numbers are calculated, not stated: they have no source to cite, they have a formula you can redo. The price used is the manufacturer's list price, which is stable and the same in every country — not a shop's price on the day.
Chosen by the declared use tier and footprint, not by price: we don't publish prices.
