EcoFlow DELTA Pro Ultra
A home backup system with a 6,900 W inverter and 6,144 Wh LFP batteries, expandable to 30 kWh, with 20 ms UPS switchover and a 5-year warranty.
- Best for whole-home backup
- Home backup system
- 6.1-30 kWh
- 6,900 W
- Made by EcoFlow.
- Made by EcoFlow. Sold as an inverter plus one 6,144 Wh LFP battery, with up to four more batteries for 30 kWh.
- Output: 6,900 W in total (230 V), including 13 A sockets and a 30 A socket.
- Charges from the grid at up to 2,900 W, from solar at up to 4,000 W plus 1,600 W; EcoFlow quotes 8,800 W combined charging.
- Reaches the house through a Manual Transfer Switch that a qualified electrician must fit. IP54 with ports covered; 5-year warranty.
Not tested by us
We have not tested the EcoFlow DELTA Pro Ultra. The figures on this page come from the sources listed at the end of the page, checked on 11 November 2026, and we do not show prices. "Best for" is based on what the maker says the product is designed for, not on our own tests.
Key figures
6,144 Wh
Per battery (up to 30 kWh)
6,900 W
AC output
5 years
Warranty
Specifications
Last checked on 11 November 2026. The grey text under each name explains what the value means. To see it next to other products, compare it in our comparison tool.
| Specification | Value |
|---|---|
| Storage | |
| CapacityHow much energy the battery stores. Bigger means longer runtime or more of your own solar power used later. | 6,144 Wh per battery pack (102.4 V, 60 A; 32S3P) |
| Battery chemistryLFP (lithium iron phosphate) cells are known for long life and stable behaviour with heat. | Lithium iron phosphate (LiFePO4, LFP) |
| Cycle lifeHow many full charge and discharge cycles the cells are rated for before they hold less than the stated share of their original capacity. | 80% or more state of health after 3,500 cycles at 0.5C/0.5C and 25 °C |
| ExpansionExtra battery units that add storage to the same system. | Up to five battery packs per inverter, for 30 kWh (6,144 Wh x 5). Packs can be hot-swapped; they are charged through the inverter only |
| Power | |
| AC outputThe power it can deliver through its sockets or inverter, in watts. | 6,900 W total at 230 V 50 Hz: 4 sockets at 13 A and 1 socket at 30 A. In bypass: 2,900 W total, 5 sockets at 12.5 A |
| AC charging inputHow fast it charges from a wall socket or the grid. | 200-240 V, 12.5 A, 50/60 Hz (charging/bypass) |
| Solar inputHow much solar panel power it accepts. A higher figure fills the battery faster on a sunny day. | High-PV input 80-450 V, 15 A, 4,000 W max; low-PV input 30-150 V, 15 A, 1,600 W max |
| Backup switchover (EPS)What happens when the grid fails. EPS means it takes over automatically. | UPS switchover under 20 ms |
| Round-trip efficiencyThe share of the energy you put in that comes back out. The rest is lost as heat. | Not stated on the product page |
| Backup in a power cutWhether it can keep selected circuits running during a grid outage. | Through the sockets, or through a Manual Transfer Switch for house circuits. The switch must be installed by a qualified electrician and be rated above 40 A |
| Ports | |
| Car outletA 12 V socket like the one in a car, for car accessories. | 12.6 V, 30 A, 378 W max |
| USB-CPorts for laptops, phones and tablets. Power delivery up to 100 W can charge most laptops. | 2 ports, 100 W max each (200 W total) |
| USB-APorts for phones, tablets and small devices. | 2 ports, 12 W each (24 W total) |
| Connection and housing | |
| Grid connectionThe supply type it is built for. Check it matches your home's supply. | 230 V single phase in the UK/EU version; not a grid-tied product (EcoFlow says it needs no anti-backfeed certification) |
| Dimensions (L × W × H)Check the space before you buy, including room around it for airflow and cables. | Inverter 690 × 481 × 214 mm; battery 660 × 455 × 204 mm (EcoFlow does not name the axes) |
| WeightMatters for lifting, wall mounting and moving it. | Inverter 32.1 kg net (41.7 kg gross); battery 50.7 kg |
| Protection ratingIP ratings show protection from dust and water. IP55 and IP65 are rated for outdoor-style exposure; check the installation guidance. | IP54, only when all ports are covered |
| Operating temperatureThe range it is rated to work in. Cold and heat can reduce performance. | Charging and discharging -20 to 45 °C; storage -20 to 45 °C; humidity up to 90%; altitude up to 3,000 m |
| Noise levelFan noise while working. | 30 dB or less (EcoFlow also says 0 dB under 2,000 W) |
| ConnectivityHow you monitor and control it, usually through an app. | Wi-Fi 2.4 GHz and Bluetooth 5.0; EcoFlow app; LCD on the unit |
| CertificationsSafety and grid standards the maker says the product meets. | CE, UKCA (IEC/EN/BS 62368-1), IEC/EN/BS 62109-1/2, IEC/EN/BS 62040-1; battery IEC 62619, IEC 62133-2 |
| Warranty | |
| WarrantyThe period the maker covers. Read the terms: conditions and capacity guarantees differ. | 5 years |
Compatible with
What EcoFlow says this product works with. Anything not listed here is not confirmed.
- Extra batteries
- The DELTA Pro Ultra Extra Battery, up to five packs per inverter in total.
- Manual Transfer Switch
- Needed to power house circuits. It must have a rated operational current above 40 A and be fitted by a qualified electrician.
- DELTA Pro and DELTA Pro 3
- Not compatible: Not compatible: EcoFlow says the 50 A hub does not support mixing them with the DELTA Pro Ultra.
- Solar panels
- EcoFlow lists its rigid solar panels as bundles. Other panels must fit the input ranges above.
Rules where you live
This is a backup system you plug appliances into or connect to your home through a Manual Transfer Switch. EcoFlow says the switch needs professional installation by a certified electrician. This is not a plug-in battery. Rules, incentives and tax treatment differ by country: see our country guides for what applies where you live.
Strengths and things to check
Strengths
- 6,900 W from one unit, enough for an EV charger or several large appliances
- Expands to 30 kWh with hot-swappable batteries
- Charges from solar, the grid, a generator or an EV charging pile
- 20 ms UPS and quiet under 2,000 W
- 5-year warranty
Worth checking before you buy
- Not a plug-and-play home battery: house circuits need a Manual Transfer Switch fitted by an electrician
- Heavy: the battery pack alone is 50.7 kg
- IP54 only with ports covered
- No round-trip efficiency stated
- Cannot be mixed with the DELTA Pro or DELTA Pro 3
Change log
We record changes to this page here, so you can see when figures such as the warranty were last updated.
- 11 November 2026
- Page published. Warranty at publication: 5 years (EcoFlow UK product page). On sale on EcoFlow's UK site at publication.
Where this information comes from
We have not tested this system. Every figure above comes from EcoFlow's UK product page for the DELTA Pro Ultra, last checked on 11 November 2026. The page gives dimensions without naming the axes. A value that the page does not state is shown as not stated.
We do not show prices, because they change often and differ between sellers.
- Manufacturer EcoFlow UK DELTA Pro Ultra page
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Common questions about EcoFlow DELTA Pro Ultra
How much does the DELTA Pro Ultra store?
Each battery pack holds 6,144 Wh. One inverter takes up to five packs, so up to 30 kWh.
Can the DELTA Pro Ultra power my whole house?
EcoFlow positions it for whole-home backup with a 6,900 W output, connected through a Manual Transfer Switch that a qualified electrician must install. Runtime depends on what you run.
Is it the same as a home battery?
It does the same job in a power cut, but it is a portable-style system rather than a wall- or floor-mounted battery wired to a hybrid inverter. See our guide to plug-in and installed home batteries.
Related guides
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