EcoFlow DELTA Pro Ultra X
A 12 kW stand-alone backup system with 6,144 Wh LFP batteries, 10 kW of solar input and up to 180 kWh with three inverters, built for 120/240 V homes.
- Best for whole-home backup
- Whole-home backup
- 12 kW
- 5-year warranty
- Made by EcoFlow.
- Output: 12 kW at 120/240 V and 60 Hz from one inverter, and up to 36 kW with three inverters in parallel. EcoFlow also quotes surges up to 45 kW.
- Storage: the standard bundle is one inverter plus two 6,144 Wh batteries (12.288 kWh). One inverter takes up to 10 batteries (61.44 kWh), and EcoFlow quotes up to 180 kWh with three inverters.
- Solar: two high-voltage inputs of 80 to 500 V, 5,000 W each, 10 kW in total, through the EcoFlow PV Switch Box.
- Not grid-tied: it draws power from the grid but never exports. 20 ms switchover with a Smart Home Panel 3 or Smart Gateway; IP54; 5-year warranty.
Not tested by us
We have not tested the EcoFlow DELTA Pro Ultra X. The figures on this page come from the sources listed at the end of the page, checked on 13 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
12 kW
AC output (36 kW with three inverters)
12.288 kWh
Standard bundle (two batteries)
5 years
Warranty
Specifications
Last checked on 13 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 (102.4 V, 60 A). The standard bundle has two batteries: 12.288 kWh |
| Battery chemistryLFP (lithium iron phosphate) cells are known for long life and stable behaviour with heat. | LFP (lithium iron phosphate), with EV-grade full-tab cells |
| 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. | Not stated |
| ExpansionExtra battery units that add storage to the same system. | Up to 10 batteries per inverter (61.44 kWh). With three inverters in parallel, up to 30 batteries (184.32 kWh); EcoFlow's headline figure is up to 180 kWh. Batteries must be connected to both battery ports of the inverter, ideally in equal numbers, to reach 12 kW |
| Battery heatingA built-in heater that lets the battery charge in cold weather. | EcoFlow says the batteries are heated in extreme cold for safe charging, and that charging is allowed at up to 45 °C |
| Power | |
| AC outputThe power it can deliver through its sockets or inverter, in watts. | 12 kW at 120/240 V, 60 Hz; up to 36 kW with three inverters in parallel. Maximum 240 V at 50 A. EcoFlow quotes surges up to 45 kW with its Adaptive Start algorithm. The frequency cannot be changed (60 Hz); in bypass it follows the mains |
| Total outletsHow many output ports it has in total, counting AC, USB and DC. | Front: 2 x NEMA 5-20 (120 V, 20 A), 1 x L14-30 (120/240 V, 30 A) and 1 x 14-50 (120/240 V, 50 A). Right side: one 5+8 input and output interface (120/240 V, 50 A) |
| AC charging inputHow fast it charges from a wall socket or the grid. | Rated 12 kW at 100/200 to 120/240 V, 50 A. 100 to 120 V: 1,800 W at 15 A; 120/240 V: 7,200 W at 30 A or 12,000 W at 50 A. The standard cable is 15 A at 120 V and still allows output from the front panel in bypass mode |
| Solar inputHow much solar panel power it accepts. A higher figure fills the battery faster on a sunny day. | 2 ports, 80 to 500 V, 15 A each, 5,000 W maximum each, 10 kW in total. EcoFlow says about 1 hour recharges 12 kWh to 80%. The solar port connects through the EcoFlow PV Switch Box (standard configuration). There is no DC output port |
| Generator chargingHow fast it can charge from a petrol or dual-fuel generator. Higher means a shorter wait with a generator running. | Supported: connect a generator to the power in/out port with the EcoFlow Generator Charging Adapter, or to the PV port through the optional EcoFlow FlowMaster Generator Rectifier. EcoFlow says the rectifier lets you charge while delivering up to 12 kW |
| Backup switchover (EPS)What happens when the grid fails. EPS means it takes over automatically. | Under 10 ms when used alone; under 20 ms with a Smart Home Panel 3 (32 circuits) or Smart Gateway |
| Round-trip efficiencyThe share of the energy you put in that comes back out. The rest is lost as heat. | Not stated |
| Backup in a power cutWhether it can keep selected circuits running during a grid outage. | Through the outlets, or for whole-home backup through the EcoFlow Smart Home Panel 3 or Smart Gateway, which switches the house from grid to battery. Rooftop solar charging through them needs current transformers |
| Solar and off-grid | |
| Works with solar panelsWhether you can charge it from solar panels. Yes means a built-in solar input or a compatible solar setup; read the detail for the voltage and power limits. | Yes: two high-voltage solar inputs (80 to 500 V), 10 kW in total. It can also charge from the surplus of an existing rooftop system through the EcoFlow Current Sense Transformer, without selling it back to the grid. |
| Off-grid useWhether the maker describes it running with no grid connection at all, for example in a cabin, van or off-grid home. Backup only means it covers power cuts but needs the grid the rest of the time. | Yes: EcoFlow describes the inverter and batteries as a stand-alone, off-grid unit. It does not export to the grid: the FAQ says grid connection is not supported and it only draws power from the grid. |
| Housing and warranty | |
| Grid connectionThe supply type it is built for. Check it matches your home's supply. | Not supported: it only draws power from the grid and never feeds power back |
| Dimensions (L × W × H)Check the space before you buy, including room around it for airflow and cables. | Inverter 675 × 475 × 230 mm (26.6 × 18.7 × 9.06 in); battery 660 × 455 × 204 mm (26 × 18 × 8 in). EcoFlow does not name the axes |
| WeightMatters for lifting, wall mounting and moving it. | Inverter 34.5 ± 0.2 kg (70.06 ± 0.44 lb); battery 50.5 ± 0.2 kg (111.3 ± 0.44 lb) |
| Protection ratingIP ratings show protection from dust and water. IP55 and IP65 are rated for outdoor-style exposure; check the installation guidance. | IP54 |
| Operating temperatureThe range it is rated to work in. Cold and heat can reduce performance. | Battery operating and storage: -20 to 45 °C (-4 to 113 °F). Inverter operating and storage: -20 to 50 °C (-4 to 122 °F) |
| Noise levelFan noise while working. | Under 30 dB at 0.5 m (25 °C ambient, 4 kW output) |
| ConnectivityHow you monitor and control it, usually through an app. | EcoFlow app and a screen on the unit. The FAQ describes resetting the Bluetooth connection; Wi-Fi is not stated |
| CertificationsSafety and grid standards the maker says the product meets. | Not stated |
| 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 Series Smart Extra Battery (6 kWh), compatible with the DELTA Pro Ultra and DELTA Pro Ultra X inverters. Up to 10 per inverter.
- Older DELTA Pro Ultra batteries
- Can be connected, but only to the rightmost battery port (the one farthest from the power in/out port) while upgrading, and nothing may be connected to the middle battery port. EcoFlow's FAQ gives the serial number prefix Y712 for these batteries.
- Home panel
- EcoFlow Smart Home Panel 3 (32 circuits) or Smart Gateway for whole-home switchover.
- Generators
- 3 to 7.2 kW and 12 kW generators, through the Generator Charging Adapter or the optional FlowMaster Generator Rectifier.
- EV charging
- EcoFlow lists charging piles and EV charging guns as compatible third-party devices, and sells a PowerPulse EV charger bundle.
Rules where you live
This is a backup system that is wired to your home through a panel or gateway. It is not a plug-in battery, and an installed system normally needs a qualified electrician and a permit. This model is built for 120/240 V, 60 Hz supplies. Rules, incentives and tax treatment differ by country: see our country guides for what applies where you live.
Strengths and things to check
Strengths
- 12 kW from one inverter, with up to 36 kW in parallel and surges up to 45 kW (EcoFlow's figure)
- 10 kW of solar input and up to 10 batteries per inverter
- 20 ms switchover with a Smart Home Panel 3 or Smart Gateway
- Quiet: under 30 dB at 4 kW output
- 5-year warranty and IP54
Worth checking before you buy
- Made for 120/240 V, 60 Hz homes: we found no page for it on EcoFlow's UK or EU sites
- Whole-home backup needs a Smart Home Panel 3 or Smart Gateway, normally fitted by an electrician
- Heavy: 34.5 kg for the inverter and 50.5 kg for each battery
- Cycle life, round-trip efficiency and certifications are not stated on the page
- It never exports to the grid, so it cannot earn export payments
Change log
We record changes to this page here, so you can see when figures such as the warranty were last updated.
- 13 November 2026
- Page published. Warranty at publication: 5 years (EcoFlow US product page). EcoFlow showed some bundles as sold out at publication.
Where this information comes from
We have not tested the DELTA Pro Ultra X. Every figure above comes from EcoFlow's US product page for the DELTA Pro Ultra X (specification table, comparison table and FAQ), last checked on 13 November 2026. We did not find the model on EcoFlow's UK or EU sites that day. 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 US DELTA Pro Ultra X page
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Common questions about EcoFlow DELTA Pro Ultra X
How much does the DELTA Pro Ultra X store?
Each battery holds 6,144 Wh. The standard bundle has two, which is 12.288 kWh. One inverter takes up to 10 batteries (61.44 kWh), and EcoFlow quotes up to 180 kWh with three inverters.
Does it feed power back to the grid?
No. EcoFlow's FAQ says grid connection is not supported: the system draws power from the grid to charge and to run in bypass, but it never exports.
Is it the same as the DELTA Pro Ultra?
No. It is the newer model. EcoFlow says it raises the output from 7,200 W to 12,000 W, the number of connectable batteries from 5 to 10 and the solar input from 5,600 W to 10,000 W. We also have a page for the DELTA Pro Ultra.
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