DELTA 2
- you run a microwave or a heater: 1,800W
- you need six AC outlets or a 12V socket
- you’d add one extra battery later
DELTA 3 1000 Air
- a PC or router needs the 10ms UPS
- you want the lighter box: 22 lb
- every load stays under 500W
Prices and stock checked by our price engine on November 5, 2026 at 6:30 AM EST. Each product is rechecked several times a day; the time refreshes when you load the page.
Same kilowatt-hour, opposite jobs: one runs the kitchen, the other keeps the router alive.
The EcoFlow DELTA 2 stores 1,024Wh and delivers 1,800W from six AC outlets, with a 12V socket and a port for one extra battery. The EcoFlow DELTA 3 1000 Air stores 960Wh but stops at 500W from a single outlet; in exchange it weighs 22 lb instead of 27 and switches to battery in 10ms instead of about 30ms. EcoFlow US sells neither anymore: its DELTA 2 page now leads to the DELTA 3, its 1000 Air page to the DELTA 3 Classic.
Below: the five differences with numbers, a 20-second calculator for your own gear, eight modeled situations, what each replacement costs today, and what published tests found.
If you own one, keep it for what it does well: the DELTA 2 for big loads and many plugs, the 1000 Air as a small, fast UPS. If you’re buying today, neither is sold by EcoFlow US: the DELTA 3 replaces the DELTA 2 and the DELTA 3 Classic replaces the 1000 Air.
- you run kitchen or heating loads
- you plug in more than one device
- you’ll add one extra battery
- you protect a PC or router: 10ms
- you carry it often: 22 lb
- you want a quiet rating: under 39dB
The five differences that decide it
Both store about 1kWh of LFP, take 500W of solar and work with the EcoFlow app over Wi-Fi and Bluetooth, and neither is sold by EcoFlow US anymore. These five gaps decide which one suits you.
Will it run your setup? Check in 20 seconds
Estimates use 85% usable capacity and 70% of rated solar output. Real results vary with temperature, inverter load, shade and appliance cycling. Fridge and freezer watts are daily averages and do not include compressor startup surges.
Runtime by appliance, one at a time
Simple energy estimates, not measured runtimes: about 870Wh usable on the DELTA 2 and 816Wh on the 1000 Air. StorageReview measured 850Wh from the DELTA 2 at a 270W load. A load above 500W does not run on the Air at all.
Appliance for appliance, the DELTA 2 lasts 7% longer than the 1000 Air.
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What their replacements cost today
EcoFlow US sends DELTA 2 shoppers to the DELTA 3, which keeps six outlets, the 12V socket and a battery port, and 1000 Air shoppers to the DELTA 3 Classic, which keeps the 10ms UPS and adds 1,800W. Both replacements switch in 10ms.
Eight modeled situations, worked out
Same formula as the calculator above, with no extra battery. The fridge averages 60W, about 525kWh a year.
24-hour outage, essentials only
Nearly the same: an evening and part of the night. Only the DELTA 2 can be extended, with one extra battery; the Air needs a power strip for these plugs.
CPAP, every night
Both carry a CPAP for more than two nights. If it stays plugged in through the unit, the Air’s 10ms switchover is the safer one.
A microwave during an outage
The DELTA 2 runs it. 1,100W is more than twice the Air’s 500W rating, and X-Boost only helps heating elements.
Six plugs at once
The DELTA 2 takes all six plugs. On the Air, a power strip works only if the total stays under 500W.
A 12V fridge in a van
Only the DELTA 2 runs a 12V fridge directly. On the Air you’d need the fridge’s AC adapter, which wastes energy through the inverter.
A desktop PC through a grid drop
About 30ms is longer than many desktop power supplies ride through, so a PC may reboot on the DELTA 2. The Air’s 10ms is safer, as long as the PC and monitor draw under 500W.
Refill from solar, 500W of panels
Practically identical. CleanTechnica filled its DELTA 2 in 3 hours from solar in Southern California.
A 1,500W space heater on high
Beyond the Air’s 800W X-Boost. The DELTA 2 runs it for about half an hour: treat it as a bridge, or use the low setting.
Nine more differences, the spec sheet and the box
Smaller gaps that rarely decide the purchase, then the full specifications and what ships in the box.
DELTA 2 and DELTA 3 1000 Air weight, dimensions and full specifications
Weight: 27 lb for the DELTA 2 and 22 lb for the DELTA 3 1000 Air. Dimensions: 15.7 × 8.3 × 11 in and 8.7 × 8.8 × 10.4 in. Both sets of figures come from EcoFlow’s archived US pages.
EcoFlow DELTA 2 and DELTA 3 1000 Air full specifications
Every published figure for both units, grouped. Green marks the better value.
What’s in the box
DELTA 2
- DELTA 21,024Wh, 27 lb
- AC charging cable
- Car charging cable
- DC5521 to DC5525 cable
- User manual, app quick start guide and warranty card
DELTA 3 1000 Air
- DELTA 3 1000 Air960Wh, 22 lb
- AC charging cable
- Quick start guide, safety instructions and warranty card
DELTA 2 box contents from its archived US page; 1000 Air from EcoFlow Canada’s page for the same 120V model. Only the DELTA 2 ships with a car charging cable.
06 · ChargingHow fast each one refills
Shorter bar, faster refill. Each row is scaled to its slower unit.
DELTA 2: X-Stream AC charging, 1,200W1000 Air: X-Stream AC charging, input watts not published
Our times divide capacity by input power, with solar at 70% of panel rating.
Every port, side by side
DELTA 2
DELTA 3 1000 Air
Practical consequence: the DELTA 2 has six AC outlets, six USB ports, a 12V socket and two DC barrels. The 1000 Air has one AC outlet and two small USB ports, enough for a router and a phone.
08 · NoiseNoise: DELTA 2 vs 1000 Air
The EcoFlow DELTA 3 1000 Air is rated under 39dB(A) at 1 m by EcoFlow. The EcoFlow DELTA 2 has no rating; one reviewer measured 58dB with its fans at full during fast charging.
The DELTA 2 figure is The Technology Man’s, on a UK unit; the Air’s is EcoFlow’s lab rating, load not stated.Every figure we found, with its source
What reviewers heard: Fans at full speed about 20dB above office background; only two fan speeds (The Technology Man, UK unit).
Measured by a tester Brand figure
- Lower the AC charging speed in the app overnight.
Cold, heat and storage: DELTA 2 vs 1000 Air
The EcoFlow DELTA 2 and the EcoFlow DELTA 3 1000 Air share the same limits: charging from 32°F to 113°F, running from 14°F to 113°F. Neither has a water rating.
Figures from EcoFlow Canada’s DELTA 2 page (same 120V model) and EcoFlow’s archived US page for the 1000 Air.- Charge either one above freezing; in winter, bring it indoors.
- For long storage, keep it at 68°F to 86°F with some charge, and top it up every few months (EcoFlow US).
App, UPS and smart features
The EcoFlow DELTA 3 1000 Air is the better UPS, at 10ms. The EcoFlow DELTA 2 answers with a battery port and 1,800W behind its EPS.
Same EcoFlow app over Wi-Fi and Bluetooth.Green zone: a switch under about 16ms, which most desktop PCs ride through without restarting.
Does it handle unstable grid voltage? EcoFlow says the EcoFlow DELTA 3 1000 Air steadies fluctuating grid voltage and switches to its own supply when it detects instability; no such feature is listed for the EcoFlow DELTA 2.
Can you add a battery later? The EcoFlow DELTA 2 takes one DELTA 2 or DELTA Max extra battery. The EcoFlow DELTA 3 1000 Air takes none.
Does it work as a UPS? The EcoFlow DELTA 3 1000 Air switches to battery in 10ms, up to 500W. EcoFlow gives no switchover time for the EcoFlow DELTA 2; reviewers quote about 30ms for its EPS mode, fine for appliances, borderline for desktop PCs.
How does the app connect? Both use the EcoFlow app over Wi-Fi and Bluetooth for monitoring and output control.
Warranty and support
EcoFlow’s US page listed 5 years for the EcoFlow DELTA 2 and 2 years for the EcoFlow DELTA 3 1000 Air. Neither is sold new by EcoFlow US; an existing unit keeps the term it was sold with.
Check the date on your original purchase.Subject to each brand’s warranty terms and eligibility.
EcoFlow rated the DELTA 2 at 3,000 cycles to 80%, about 8 years at one full cycle a day. For the DELTA 3 1000 Air it gives no cycle count, only 3,219.84kWh delivered over 10 years in its lab, roughly 3,350 full charges of 960Wh.
- If you own either one, keep your proof of purchase: the term runs from that date.
- Buying a leftover or used unit, ask the seller whether EcoFlow’s warranty still applies.
What reviewers report
We have not lab-tested these two units, and we found no independent test of the 1000 Air. Here is what 5 published reviews found, with the source, author and date for each point. Reviews of UK and EU units are flagged: those models charge from 230V outlets and have different sockets, so their charge times and outlet findings don’t carry over to US units.
DELTA 2: StorageReview (December 2022), CleanTechnica (October 2022), The Technology Man (UK unit), Trusted Reviews (December 2022, UK unit), SlashGear1000 Air: no verifiable independent test found
Usable capacity
- DELTA 2Reviewer With a steady 270W load, the testers measured 0.85kWh of total output from the 1,024Wh battery. StorageReview, Kevin OBrien, December 2022
Charging
- DELTA 2Reviewer It pulled 1,100W from a wall outlet and filled in under an hour. CleanTechnica, Kyle Field, October 2022
- DELTA 2Reviewer Solar panels set up at 9am in Southern California filled it in 3 hours without being moved. CleanTechnica, Kyle Field, October 2022
- DELTA 2Reviewer From flat, it reached 80% in just under 50 minutes and 100% in just under 80, matching EcoFlow’s claims. The Technology Man, UK unit
- DELTA 2Reviewer On a bright day a solar panel peaked at 295W, enough to fill the battery in under 4 hours. Trusted Reviews, David Ludlow, December 2022, UK unit
- DELTA 2Reviewer Solar charging took three hours with 500W of solar input. SlashGear, Ewdison Then
Noise and heat
- DELTA 2Reviewer Measured 58dB at 1 m with the fans at full speed while fast charging; a lower 800W charge rate cut it by 10dB. The Technology Man, UK unit
Practical limits before you buy
- EcoFlow US sells neither one. Its DELTA 2 page leads to the DELTA 3 and its 1000 Air page to the DELTA 3 Classic; check any seller’s warranty terms before buying a used or leftover unit.
- 500W is the Air’s hard limit. Microwaves, kettles, coffee makers, hair dryers and space heaters overload it.
- The Air has one AC outlet. Plan a power strip, and keep the total under 500W.
- About 30ms is borderline for desktop PCs. For a computer on the DELTA 2, test the switchover before you rely on it.
- X-Boost is for heating loads only. It lowers the voltage to keep a heating element running; motors and electronics need the rated 1,800W or 500W.
- Only the DELTA 2 has a 12V car socket, DC barrels and a battery port.
- Neither charges below freezing. Bring it indoors to charge in winter.
- DELTA 2 extra battery: only one DELTA 2 or DELTA Max Extra Battery fits, per EcoFlow.
Frequently asked questions
Can I still buy the DELTA 2 or the DELTA 3 1000 Air from EcoFlow US?
No. EcoFlow US redirects the DELTA 2 page to the DELTA 3 and the 1000 Air page to the DELTA 3 Classic. Any unit you find now is leftover or used stock.
What replaced each one?
The DELTA 3 replaced the DELTA 2: six AC outlets, a 12V socket and a battery port, with a 10ms UPS. The DELTA 3 Classic replaced the 1000 Air: same 10ms UPS, but 1,800W from three outlets.
Which has the bigger battery?
The DELTA 2, slightly: 1,024Wh against 960Wh, both LFP. StorageReview measured 850Wh out of a DELTA 2 at a 270W load; no one has published a capacity test of the Air.
Can the 1000 Air run a microwave?
No. A typical microwave draws over 1,000W, twice the Air’s 500W rating. The DELTA 2 runs one at 1,800W.
Which is better as a UPS?
The 1000 Air: 10ms. EcoFlow gives no time for the DELTA 2; reviewers quote about 30ms for its EPS mode, which some desktop PCs don’t ride through. The Air’s limit is 500W.
How many outlets does each have?
The DELTA 2 has six AC outlets, two 100W USB-C, four USB-A, a 12V car socket and two DC barrels. The 1000 Air has one AC outlet, one 18W USB-C and one 12W USB-A.
Which charges faster?
The DELTA 2: about 80 minutes from the wall at 1,200W, against about 2 hours for the Air. From solar, both take 500W.
How long will each run a refrigerator?
At a 60W average: about 14.5 hours on the DELTA 2 and 13.6 hours on the 1000 Air.
Can I add a battery to either?
The DELTA 2 takes one DELTA 2 or DELTA Max extra battery; the 1000 Air takes none.
How much do they weigh?
27 lb for the DELTA 2 and 22 lb for the 1000 Air.
How loud are they?
The Technology Man measured the DELTA 2 at 58dB at 1 m with its fans at full speed during fast charging. EcoFlow rates the Air under 39dB(A) at 1 m; no reviewer has measured it.
Related comparisons and reviews
How we compared and sources
Research-based comparison. We have not physically tested these two units. EcoFlow US no longer sells either one and redirects both pages to newer models, so their specs come from the US pages as archived (DELTA 2 on June 2, 2025, DELTA 3 1000 Air on March 19, 2026), completed by EcoFlow Canada’s pages for the same 120V models. Usage observations are attributed to named reviewers. Checked on October 31, 2026.
- Specs: EcoFlow US, DELTA 2 (archived June 2, 2025) and EcoFlow US, DELTA 3 1000 Air (archived March 19, 2026).
- Temperatures and outlet details: EcoFlow Canada, DELTA 2 and EcoFlow Canada, DELTA 3 1000 Air, same 120V models; the Air’s single AC outlet is counted on EcoFlow’s official product photos.
- Reviewer reports on the DELTA 2: StorageReview, Kevin OBrien, December 2022, CleanTechnica, Kyle Field, October 2022, The Technology Man, UK unit, Trusted Reviews, David Ludlow, December 2022, UK unit, SlashGear, Ewdison Then.
- Runtime = capacity × 0.85 ÷ watts. Solar harvest = min(panel watts, max input) × sun hours × 0.70.
The DELTA 2 runs 1,800W from six outlets; the 1000 Air switches in 10ms at 500W. EcoFlow US sells neither: see their replacements.
Prices checked November 5, 2026 at 6:30 AM EST
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Originally published: November 1, 2026