EcoFlow DELTA 3 Ultra
A 3,072 Wh LFP power station for 120 V homes with 3,600 W of AC output, 1,800 W wall charging, home connection options and a 5-year warranty. It cannot be expanded.
- Best for outage and RV power
- Power station
- 3,072 Wh
- 3,600 W
- Made by EcoFlow.
- Capacity: 3,072 Wh (51.2 V, 60 Ah) with LFP cells. EcoFlow says this basic model does not support battery expansion; the DELTA 3 Ultra Plus does.
- Output: 3,600 W continuous at 120 V 60 Hz, 7,200 W surge, and up to 4,600 W with X-Boost. Four 20 A outlets and one 30 A outlet.
- Recharges from the wall at 1,800 W (80% in about 89 minutes) or from solar at up to 800 W.
- Sold in the United States: EcoFlow says it is not CARB-approved and cannot ship to California. The page carried a pre-order notice when we checked.
Not tested by us
We have not tested the EcoFlow DELTA 3 Ultra. 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
3,072 Wh
Capacity (not expandable)
3,600 W
AC output (7,200 W surge)
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. | 3,072 Wh (51.2 V, 60 Ah) |
| Battery chemistryLFP (lithium iron phosphate) cells are known for long life and stable behaviour with heat. | LFP (LiFePO4), automotive-grade full-tab cells, 16-cell design per kWh. EcoFlow estimates a lifespan of about 10 years from internal simulation data, for reference only |
| 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. | None. EcoFlow says the DELTA 3 Ultra does not support battery expansion |
| Output | |
| AC output (continuous)The power it can deliver all the time. Add up the watts of what you want to run at once and stay below this. | 3,600 W total at 120 V 60 Hz: 4 outlets at 20 A max each and 1 outlet at 30 A max |
| AC output (surge)A short burst above the continuous rating, for appliances that draw more power when they start. | 7,200 W |
| X-BoostA mode that can run some devices above the normal output rating by lowering the voltage it supplies. Not suitable for every device. | Runs devices up to 4,600 W (X-Boost 3.0) |
| X-FusionWhile it is plugged into the grid or a generator, the inverter can supply more than a standard plug passes through, so one outlet can deliver its full rated power. | Yes (X-Fusion 3.0): in bypass mode with a grid or generator input, the inverter can supply the full 3,600 W through one outlet instead of the 1,800 W of a standard plug |
| Smart Output PriorityLets you choose in the app which circuits stay powered, so non-essential loads shut off and the essentials run longer. | No (only on the DELTA 3 Ultra Plus) |
| USB-APorts for phones, tablets and small devices. | 1 port, 18 W max |
| USB-CPorts for laptops, phones and tablets. Power delivery up to 100 W can charge most laptops. | 1 port, 140 W max (HID), plus 2 ports at 45 W max each, 45 W in total |
| Car outletA 12 V socket like the one in a car, for car accessories. | 1 outlet, 12.6 V 10 A, 126 W max. No Anderson port on this model |
| Total outletsHow many output ports it has in total, counting AC, USB and DC. | 10 outlets |
| Charging | |
| AC chargingHow fast it charges from a wall socket. Higher means a shorter wait. | 1,800 W from 100-120 V, 15 A, 50/60 Hz |
| Time to charge from the mainsHow long a full charge takes from a wall socket. | 80% in about 89 minutes (1.48 hours) on EcoFlow's product page; EcoFlow's FAQ says 91 minutes to 80% and 120 minutes to 100% |
| Solar inputHow much solar panel power it accepts. A higher figure fills the battery faster on a sunny day. | 800 W max |
| Solar charging timeHow long a full charge takes from solar panels, in the conditions the maker names. | 80% in about 3.37 hours at 800 W |
| Generator chargingHow fast it can charge from a petrol or dual-fuel generator. Higher means a shorter wait with a generator running. | EcoFlow's FAQ says up to 1,800 W; its comparison table says 1,600 W. Works with the Smart Generator 3000 and 4000 (Dual Fuel), without Auto Start/Stop |
| Car chargingCharging from a car's 12 V or 24 V socket while driving. Slow, but useful on the road. | Alternator charging up to 720 W through the XT60 port |
| Backup switchover (EPS)What happens when the grid fails. EPS means it takes over automatically. | Under 10 ms (UPS) |
| Backup in a power cutWhether it can keep selected circuits running during a grid outage. | Powers devices directly from its outlets, or runs home circuits through a Manual Transfer Switch (sold separately) or an Inlet Box |
| 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: built-in solar input, 800 W max. |
| 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: runs devices from its own battery with no mains connection and recharges from solar, a generator or an alternator. |
| Housing and warranty | |
| Dimensions (H × W × D)Check the wall or floor space before you buy, including room for airflow and cables. | 625.99 × 327.71 × 394.95 mm (listed by EcoFlow as height × width × depth) |
| WeightMatters for lifting, wall mounting and moving it. | 32.7 ± 0.6 kg |
| Operating temperatureThe range it is rated to work in. Cold and heat can reduce performance. | Charging 0 to 45 °C, discharging -10 to 45 °C, storage -10 to 45 °C; optimal operating range 20 to 30 °C. EcoFlow also lists 95% humidity tolerance and a drop-resistant (0.2 m) cell-to-chassis structure |
| Noise levelFan noise while working. | 25 dB or less at 600 W (measured at 1 m, 25 °C) |
| Protection ratingIP ratings show protection from dust and water. IP55 and IP65 are rated for outdoor-style exposure; check the installation guidance. | Not stated |
| ConnectivityHow you monitor and control it, usually through an app. | Wi-Fi and Bluetooth; EcoFlow app (OASIS 3.0) with energy dashboard, Storm Guard Mode, Self-Powered Mode and scheduled charging |
| CertificationsSafety and grid standards the maker says the product meets. | Class B EMC |
| WarrantyThe period the maker covers. Read the terms: conditions and capacity guarantees differ. | 5 years (3-year standard warranty plus 2 years extra after registering in the EcoFlow app) |
How long will it run your devices?
Choose how many of each device you want to run at the same time. The wattages are typical figures, so check the label on your own devices.
| Device | Typical power | How many |
|---|---|---|
| 10 W | ||
| 10 W | ||
| 15 W | ||
| 60 W | ||
| 80 W | ||
| 80 W | ||
| 40 W | ||
| 1,000 W | ||
| 2,000 W | ||
| 1,000 W | ||
| W |
The estimate assumes 85% of the rated capacity is usable after conversion losses. EcoFlow does not state this figure, so we use a cautious assumption. Real running times vary with temperature, battery age and how each device draws power.
Compatible with
What EcoFlow says this product works with. Anything not listed here is not confirmed.
- Extra batteries
- Not compatible: Not compatible. EcoFlow says the DELTA 3 Ultra does not support battery expansion; extra batteries are listed for the DELTA 3 Ultra Plus only.
- Solar panels
- One solar input up to 800 W. EcoFlow lists its 110 W, 160 W NextGen, 220 W NextGen bifacial and 400 W portable panels, and bundles with 2 x 160 W or 2 x 220 W panels.
- Smart Generators
- Compatible with the EcoFlow Smart Generator 3000 and 4000 (Dual Fuel) for longer runtime. It does not have the Auto Start/Stop feature of the Ultra Plus.
- Alternator chargers
- EcoFlow lists its 500 W, 600 W, 800 W and Plus 1000 alternator chargers as compatible accessories; this model charges from an alternator at up to 720 W.
- Home connection
- Manual Transfer Switch (sold separately; a 30 A transfer switch is listed as an add-on) or an Inlet Box.
Rules where you live
This is the 120 V, 60 Hz model that EcoFlow sells in the United States, so it will not suit a 230 V grid without a different regional version. A power station is not wired into your home on its own: EcoFlow says it connects to a home through a Manual Transfer Switch or an Inlet Box, and the rules for that vary by country and state. See our country guides for the rules, incentives and prices where you live.
Strengths and things to check
Strengths
- 3,600 W continuous, 4,600 W with X-Boost
- 3,072 Wh in one unit
- X-Fusion: full 3,600 W through one outlet while plugged in
- 10 ms UPS switchover and quiet: 25 dB or less at 600 W
- Two ways to connect to a home: transfer switch or inlet box
- 5-year warranty
Worth checking before you buy
- Weighs about 32.7 kg
- Cannot be expanded; the Ultra Plus can
- Solar input is limited to 800 W, and 80% by solar takes over 3 hours
- US 120 V 60 Hz version, not CARB-approved, no shipping to California
- Pre-order notice on EcoFlow's US page at the time of checking
- No cycle life or protection rating stated
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). The US product page carried a pre-order notice, and the DELTA 3 Ultra Plus listing said it ships in mid-December 2026. EcoFlow says the product is not CARB-approved and cannot ship to California.
Where this information comes from
We have not tested the DELTA 3 Ultra. Every figure above comes from EcoFlow's own pages: its US product page for the DELTA 3 Ultra (specification table), the DELTA 3 Ultra Series page and EcoFlow's DELTA 3 Ultra FAQ, last checked on 13 November 2026. These pages cover both the DELTA 3 Ultra and the DELTA 3 Ultra Plus; we only show the DELTA 3 Ultra values. Where EcoFlow's pages disagree (wall charging time, generator charging power) both figures are shown. A value that the pages do not state is shown as not stated.
We do not show prices, because they change often and differ between sellers.
- Manufacturer EcoFlow US DELTA 3 Ultra product page (specifications and Basic vs Plus comparison)
- Manufacturer EcoFlow US DELTA 3 Ultra Plus and DELTA 3 Ultra FAQ
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Common questions about EcoFlow DELTA 3 Ultra
What can the DELTA 3 Ultra run?
EcoFlow rates it at 3,600 W continuous and 7,200 W surge at 120 V, with X-Boost reaching 4,600 W for suitable devices. EcoFlow lists a 200 W refrigerator for 12 to 24 hours and says it covers items such as microwaves, dryers and lawn mowers. Divide 3,072 Wh by the load for a rough running time.
Can the DELTA 3 Ultra be expanded?
No. EcoFlow says the DELTA 3 Ultra does not support battery expansion. The DELTA 3 Ultra Plus has one extra battery port (expandable to two) and expands from 3 to 11 kWh.
What is the difference between the DELTA 3 Ultra and the Ultra Plus?
Both hold 3,072 Wh and output 3,600 W. On EcoFlow's table the Ultra Plus adds battery expansion (3 to 11 kWh), 1,600 W of solar input (the Ultra takes 800 W), 3,200 W generator charging, an Anderson DC port and Smart Output Priority. It is slightly heavier, at 33.7 kg against 32.7 kg.
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