DELTA 2
- you carry it often: 27 lb
- 1kWh covers your evenings and nights
- you want cycles rated to 80%
DELTA 3 1500
- you want 1,536Wh in the same size box
- a router or NAS needs the 15ms UPS
- you refill from the wall at 1,500W
Prices and stock checked by our price engine on November 13, 2026 at 5:31 AM EST. Each product is rechecked several times a day; the time refreshes when you load the page.
Same case, same outlets, same 1,800W. The 1500 is half a kilowatt-hour more battery, and that’s most of the story.
The EcoFlow DELTA 2 stores 1,024Wh and the EcoFlow DELTA 3 1500 stores 1,536Wh; both deliver 1,800W from six AC outlets, with the same USB, car socket and DC barrels, in a 15.7-inch case. The 1500 weighs 36 lb instead of 27, switches to battery in 15ms instead of about 30ms and charges at 1,500W instead of 1,200W, but its 3,000 cycles are rated to 70% instead of 80%. EcoFlow US sells neither on its own anymore: its DELTA 2 page leads to the DELTA 3, and the 1500 is listed only as a solar kit.
Below: what changed with numbers, a 20-second calculator for your own gear, eight modeled situations, what each one’s replacement costs today, and what published tests found.
If you own one, keep it: they share the inverter, the outlets and the ports, and the 1500 simply holds half again as much. If you’re buying today, EcoFlow US sells neither on its own: the DELTA 3 replaces the DELTA 2, and the DELTA 3 Max is the step up from the 1500.
- you carry it: 27 lb
- you want 3,000 cycles to 80%
- you’ve heard it: tests published
- you want 1,536Wh
- you protect a router: 15ms
- you refill at 1,500W
The five differences that decide it
Both use LFP cells and deliver 1,800W with 2,200W of X-Boost from six AC outlets, with two 100W USB-C, four USB-A, a 126W car socket, two DC5521 barrels, 500W of solar on one port, an extra battery port and the EcoFlow app. Neither is sold on its own by EcoFlow US anymore. These five gaps decide it.
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 1,306Wh on the DELTA 3 1500. StorageReview measured 850Wh from the DELTA 2 at 270W, and mybest 1,310Wh from a Japanese 1500.
Appliance for appliance, the DELTA 3 1500 lasts 50% longer than the DELTA 2.
Same appliance, same watts: the gap is always the size of the battery.Get our Black Friday alerts for EcoFlow
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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 switches in 10ms. For more than the 1500’s 1,536Wh in one box, the DELTA 3 Max holds 2,048Wh with 2,400W, but has four outlets and no battery port. A DELTA 3 with its extra battery reaches 2,048Wh while keeping six outlets.
Eight modeled situations, worked out
Same formula as the calculator above: 85% of the rated capacity, no extra battery. The fridge averages 60W, about 525kWh a year.
24-hour outage, essentials only
The DELTA 2 gets you through an evening, the 1500 through the evening and most of the night. One extra battery on either covers more.
CPAP with humidifier, two nights
Only the 1500 covers two full nights. The DELTA 2 covers one and part of the second; without the humidifier (40W) it covers about 2.7 nights.
A router and NAS through a grid drop
The 1500’s 15ms is the safer of the two. For a desktop PC, which may ride through roughly 16ms, neither leaves much margin.
Refill from solar, 500W of panels
Same 500W limit, so the 1500 needs about 1.5 hours more sun. CleanTechnica filled its DELTA 2 in 3 hours from solar.
Refill from the wall before a storm
Close: the 1500 draws more power but has half again as much to fill.
A full-size fridge, nothing else
The 1500 keeps food cold about 7 hours longer, close to a full day.
A 1,500W space heater on high
Heaters drain any portable station fast. Use the low setting and treat either as a bridge, not a heating plan.
Moving it
Same footprint; the 1500 is 9 lb heavier. Both are one-person carries.
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 1500 weight, dimensions and full specifications
Weight: 27 lb for the DELTA 2 and 36 lb for the DELTA 3 1500. Dimensions: 15.7 × 8.3 × 11 in and 15.7 × 8.3 × 11.1 in. Everything else is in the sheet below.
EcoFlow DELTA 2 and EcoFlow DELTA 3 1500 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 1500
- DELTA 3 1500 power station1,536Wh, 36 lb
- AC charging cable
- Car charging cableprovided, per the manual
- User manual and warranty card
- Solar cable sold separatelyEcoFlow Solar to XT60i cable
DELTA 2 box contents from its archived US page; DELTA 3 1500 from its user manual. Both ship 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, 1,200WDELTA 3 1500: one XT60i port for solar or car; GladiatorUp saw about 97W from a truck’s 12V socket
Our solar times assume panels deliver 70% of their rating; the brands’ figures assume ideal sun.
Every port, side by side
DELTA 2
DELTA 3 1500
Practical consequence: the two are the same box on the outside, port for port: six AC outlets, two 100W USB-C, four USB-A, a 126W car socket, two DC barrels and one battery port.
08 · NoiseNoise: DELTA 2 vs DELTA 3 1500
Only the EcoFlow DELTA 2 has a published figure: The Technology Man measured 58dB at 1 m with its fans at full during fast charging. EcoFlow gives no rating for the EcoFlow DELTA 3 1500, and we found no measurement.
The DELTA 2 figure is from a UK unit.Every figure we found, with its source
What reviewers heard: 58dB at 1 m with the fans at full speed during fast charging, about 10dB less at an 800W charge rate (The Technology Man, UK unit).
No decibel figure published.
Measured by a tester Brand figure
- Lower the AC charging speed in the app overnight.
Cold, heat and storage: DELTA 2 vs DELTA 3 1500
The EcoFlow DELTA 2 and the EcoFlow DELTA 3 1500 share the same limits: charging from 32°F to 113°F, running from 14°F to 113°F. Only the 1500’s battery pack carries a water rating, IP54.
Figures from EcoFlow Canada’s DELTA 2 page (same 120V model) and the DELTA 3 1500 user manual.- Charge either one indoors in winter: neither charges below 32°F.
- For storage, keep it between 68°F and 86°F with some charge left, and cycle it every three months.
App, UPS and smart features
The EcoFlow DELTA 3 1500 is the better UPS, at 15ms, and tops up from a Smart Generator automatically. The EcoFlow DELTA 2 matches it on the app and the battery port.
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 work with EcoFlow’s Smart Generator? EcoFlow says the Smart Generator 3000 (Dual Fuel) tops the EcoFlow DELTA 3 1500 up automatically. Its pages for the EcoFlow DELTA 2 list no such link.
Does it work as a UPS? The EcoFlow DELTA 3 1500 is a standby UPS with a 15ms transfer. EcoFlow gave no switchover time for the EcoFlow DELTA 2; reviewers quote about 30ms for its EPS mode, fine for appliances, borderline for desktop PCs.
Can you add a battery later? Each has one battery port: the EcoFlow DELTA 2 takes a DELTA 2 or DELTA Max extra battery, the EcoFlow DELTA 3 1500 a DELTA 3 family or DELTA Pro 3 battery.
How does the app connect? Both use the EcoFlow app over Wi-Fi and Bluetooth for monitoring, output control and charge limits.
Warranty and support
EcoFlow’s archived US page listed the EcoFlow DELTA 2 at 5 years, and its US warranty table lists the EcoFlow DELTA 3 1500 at 5 years with nothing to register. Both are rated for 3,000 cycles, to 80% on the DELTA 2 and to 70% on the 1500.
Same term; 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% and rates the DELTA 3 1500 at 3,000 cycles to 70%, both about 8 years at one full cycle a day. Heat and age also wear a battery.
- If you own either one, keep your proof of purchase: the term runs from that date.
- Cycle a 1500 in storage every three months: its manual voids coverage after six months unused.
What reviewers report
We have not lab-tested these two units. Here is what 7 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), SlashGearDELTA 3 1500: GladiatorUp (October 2026), mybest (Japan) (July 2026, Japanese unit)
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
- DELTA 3 1500Reviewer mybest measured 1,310Wh of usable energy from the 1,536Wh pack, about 85 percent. mybest (Japan), Asuka Fukuda, July 2026, Japanese unit
- DELTA 3 1500Reviewer Its conversion-efficiency score was 4.27, ranking 44th of 84 power stations mybest tested against a 90 percent target. mybest (Japan), Asuka Fukuda, July 2026, Japanese unit
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 3 1500Reviewer Charging from the truck’s factory 12V socket gave only about 97W of input, so the car outlet is a slow way to refill it. GladiatorUp, Doug Stokes, October 2026
- DELTA 3 1500Reviewer On one long drive the 12V socket added only about 20 percent of charge in roughly four hours while also running his travel setup. GladiatorUp, Doug Stokes, October 2026
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
UPS and output
- DELTA 3 1500Reviewer In daily use it runs his 26-quart car fridge, CPAP, fans, lights and device charging during weekend overlanding trips. GladiatorUp, Doug Stokes, October 2026
- DELTA 3 1500Reviewer Enough output and capacity for an electric blanket, rice cooker or portable fridge during an outage, in their assessment. mybest (Japan), Asuka Fukuda, July 2026, Japanese unit
Daily use and issues
- DELTA 3 1500Reviewer Relying on the cigarette-lighter circuit blew the Jeep’s 20A accessory fuse more than once; he does not blame the EcoFlow itself. GladiatorUp, Doug Stokes, October 2026
- DELTA 3 1500Reviewer He found the app genuinely useful for watching input, output and battery state without climbing into the vehicle. GladiatorUp, Doug Stokes, October 2026
- DELTA 3 1500Reviewer At around 36 lbs he treats it as semi-permanent vehicle equipment rather than something to carry far. GladiatorUp, Doug Stokes, October 2026
- DELTA 3 1500Reviewer The reviewers flag that it has no wheels and weighs about 16.1kg, so they see it mainly as home backup kept in one place. mybest (Japan), Asuka Fukuda, July 2026, Japanese unit
Practical limits before you buy
- EcoFlow US sells neither one on its own. Its DELTA 2 page leads to the DELTA 3, and the 1500 is listed only as a solar kit, sold out on October 31, 2026; check any seller’s warranty terms.
- Same 1,800W ceiling. A microwave and a coffee maker together overload either one.
- Neither is a good UPS for a desktop PC. 15ms leaves almost no margin and about 30ms none; their replacements switch in 10ms.
- X-Boost is for heating loads only, and on the 1500 it’s off while the unit is plugged in.
- Same 500W solar input. The 1500 takes about 1.5 hours more sun to refill.
- Extra batteries differ. DELTA 2 batteries and DELTA 3 family batteries are not the same lineup.
- Cycle the 1500 every few months in storage: its manual voids coverage after six months unused.
- Neither charges below freezing.
Frequently asked questions
Can I still buy the DELTA 2 or the DELTA 3 1500 from EcoFlow US?
Not on their own. EcoFlow US redirects the DELTA 2 page to the DELTA 3 and lists the 1500 only as a solar kit, sold out when we checked on October 31, 2026.
What replaced each one?
The DELTA 3 replaced the DELTA 2: six AC outlets, a 12V socket, a battery port and a 10ms UPS. For more than the 1500’s 1,536Wh in one box, the DELTA 3 Max holds 2,048Wh with 2,400W.
What is the difference between the DELTA 2 and the DELTA 3 1500?
The 1500 stores 1,536Wh against 1,024Wh, switches in 15ms against about 30ms and charges at 1,500W against 1,200W, for 36 lb against 27 lb. Output, outlets, ports and solar input are the same.
Which is better as a UPS?
The 1500, at 15ms. EcoFlow gave no time for the DELTA 2; reviewers quote about 30ms for its EPS mode. For a desktop PC, the 10ms of their replacements is safer.
How long will each run a refrigerator?
At a 60W average: about 14.5 hours on the DELTA 2 and 21.8 hours on the 1500.
Which charges faster?
From the wall to 80%, the DELTA 2 in 50 minutes and the 1500 in 60. From solar, both take 500W, so the 1500 takes about 1.5 hours longer.
How much do they weigh?
27 lb for the DELTA 2 and 36 lb for the DELTA 3 1500.
How loud are they?
The Technology Man measured the DELTA 2 at 58dB at 1 m with its fans at full during fast charging. EcoFlow publishes no figure for the 1500, and we found no measurement.
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 on its own: DELTA 2 specs come from its US page as archived on June 2, 2025, completed by EcoFlow Canada’s page for the same 120V model; DELTA 3 1500 specs from EcoFlow’s US solar kit page, its user manual and EcoFlow Canada’s page. Usage observations are attributed to named reviewers. Checked on October 31, 2026.
- Specs: EcoFlow US, DELTA 2 (archived June 2, 2025), EcoFlow Canada’s page for the same 120V model; and EcoFlow US, DELTA 3 1500 Solar Generator, its user manual (EF-DL-H15-3); read on October 31, 2026. AC outlet count of the 1500 derived from the 15 outputs on EcoFlow Canada’s page; warranty terms from the EcoFlow US warranty policy.
- 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; on the DELTA 3 1500: GladiatorUp, Doug Stokes, October 2026, mybest (Japan), Asuka Fukuda, July 2026, Japanese unit.
- Runtime = capacity × 0.85 ÷ watts. Solar harvest = min(panel watts, max input) × sun hours × 0.70. Cost per lifetime kWh = price ÷ (cycles × capacity in kWh).
Same 1,800W and ports; the 1500 adds 512Wh and a 15ms UPS for 9 lb. EcoFlow US sells neither on its own: see their replacements.
Prices checked November 13, 2026 at 5:31 AM EST
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Originally published: November 9, 2026