DELTA 2
- you already own one: keep it, the battery is the same size
- you need six AC outlets or a 12V socket
- you’d add a battery: it takes one extra battery
DELTA 3 Classic
- you’re buying new: 1kWh for the lowest DELTA price
- a PC or a router needs the 10ms UPS
- three AC plugs and USB are enough
Prices and stock checked by our price engine on November 5, 2026 at 4:59 AM EST. Each product is rechecked several times a day; the time refreshes when you load the page.
Same battery, same inverter rating. The Classic is newer, but it’s not a straight upgrade.
EcoFlow US no longer sells the DELTA 2: its page now redirects to the DELTA 3. The DELTA 3 Classic is the simplest 1kWh DELTA 3 it does sell. Both store 1,024Wh of LFP and deliver 1,800W. The Classic switches to battery in 10ms instead of about 30ms and charges at 1,400W instead of 1,200W. The DELTA 2 had six AC outlets instead of three, a 12V car socket, two DC barrels and a port for one extra battery, all of which the Classic drops.
Below: what changed with numbers, a 20-second calculator for your own gear, eight modeled situations, a third option, and what published tests found on each.
If you’re buying today, the choice is the Classic or another DELTA 3: EcoFlow US no longer sells the DELTA 2. Against the DELTA 2, the Classic trades three AC outlets, the 12V socket and expansion for a faster UPS and faster charging.
- you use more than three AC outlets
- you run 12V gear from the car socket
- you’ll add one extra battery
- you protect a PC: 10ms
- you want a 1-hour wall refill
- you want the simplest 1kWh DELTA
The five differences that decide it
Both store 1,024Wh of LFP, deliver 1,800W of continuous AC, take 500W of solar on one port and work with the EcoFlow app. These five gaps decide the purchase.
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 both; StorageReview measured 850Wh from the DELTA 2 at a 270W load.
Same battery, same runtime.
The DELTA 2 and the Classic both hold about 870Wh usable, so every appliance runs just as long on either one.Get our Black Friday alerts for EcoFlow
We track live prices on 40+ models from Jackery, EcoFlow, BLUETTI and Anker SOLIX. When a deal beats the lowest price we've recorded, you'll hear from us. During Black Friday week, one short recap a day at most.
Unsubscribe in one click. We may earn a commission when you buy through our links, at no extra cost to you. Privacy Policy
What a new 1kWh DELTA costs today
The DELTA 3 is where EcoFlow US now sends DELTA 2 shoppers: it restores the six outlets, the 12V socket and the battery port, with a 10ms UPS, for more than the Classic.
The third option: the DELTA 3 at $579
EcoFlow DELTA 3: $579 today
Where EcoFlow US now sends DELTA 2 shoppers. Same 1,024Wh and 1,800W, six AC outlets, a 126W car socket, two DC barrels, 500W of solar and a 10ms UPS, and it grows to 5kWh with DELTA 3, DELTA 2, DELTA 2 Max or DELTA Pro 3 extra batteries. OutdoorGearLab measured 870Wh out of it and a full wall charge in about 50 minutes. Our DELTA 3 review goes deeper. See the DELTA 3 at EcoFlow.
Eight modeled situations, worked out
Same formula as the calculator above, with 0 extra batteries unless stated. The fridge averages 60W, about 525kWh a year.
24-hour outage, essentials only
Same battery, same runtime: an evening and part of the night. Only the DELTA 2 can be extended, with one extra battery.
CPAP, two nights
Both cover the two nights with about a quarter left. If the CPAP stays plugged in through the unit, the Classic’s 10ms switchover is the safer one.
Six plugs at once
The DELTA 2 takes all six plugs. On the Classic, add a power strip, keeping the total under 1,800W.
A 12V fridge in a van
Only the DELTA 2 runs a 12V fridge directly. On the Classic 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 Classic’s 10ms is the safer bet.
Refill from solar, 500W of panels
Identical. CleanTechnica filled its DELTA 2 in 3 hours from solar in Southern California.
A full-size fridge, nothing else
Same battery, same runtime. With solar during the day, either can carry a fridge through a multi-day outage.
A 1,500W space heater on high
Heaters drain any 1kWh station in well under an hour. Use the low setting and treat the station as a bridge.
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 Classic weight, dimensions and full specifications
Weight: 27 lb for the DELTA 2 and 26.6 lb for the DELTA 3 Classic. Dimensions: 15.7 × 8.3 × 11 in and 15.6 × 7.8 × 11.2 in. DELTA 2 figures come from EcoFlow Canada’s page for the same 120V model.
EcoFlow DELTA 2 and DELTA 3 Classic 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
- User manual and warranty card
DELTA 3 Classic
- DELTA 3 Classic power station1,024Wh, 26.6 lb
- AC charging cable
- Manuals and warranty card
- Solar cable sold separatelyEcoFlow Solar to XT60i cable; a reviewer flagged its absence
- No car charging cablesold separately, per the manual
DELTA 2 box contents as EcoFlow listed them when it was on sale; DELTA 3 Classic from its manual.
07 · 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 Classic: one XT60i port for solar or car
Our times divide capacity by input power, with solar at 70% of panel rating.
Every port, side by side
DELTA 2
DELTA 3 Classic
Practical consequence: the DELTA 2 has twice the AC outlets, four USB-A ports, a 12V socket and two DC barrels. The Classic keeps three AC outlets, two USB-C and one USB-A.
09 · NoiseNoise and heat: DELTA 2 vs Classic
Several reviewers call the Classic quieter than the DELTA 2 it replaces.
The DELTA 2 figure is The Technology Man’s, on a UK unit; EcoFlow rates only the Classic, at 30dB or less at 600W.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).
What reviewers heard: Quiet at light loads, clearly audible under heavy load or fast AC charging; fans heard with an 1,825W grill as battery temperature climbed from 35 to 53°C (Basic Tutorials, EU unit).
Measured by a tester Brand figure
- Lower the AC charging speed in the app overnight.
Cold, heat and storage: DELTA 2 vs Classic
The EcoFlow DELTA 2 and the EcoFlow DELTA 3 Classic 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 the DELTA 3 Classic manual and EcoFlow Canada’s DELTA 2 page (same 120V model).- 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 Classic is the better UPS, at 10ms, and adds Storm Guard and timed charging. The EcoFlow DELTA 2 answers with an expansion 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.
Can you add a battery later? The EcoFlow DELTA 2 takes one DELTA 2 or DELTA Max extra battery. The EcoFlow DELTA 3 Classic has no battery port; the DELTA 3 does.
Does it prepare for storms? The EcoFlow DELTA 3 Classic starts charging when extreme weather alerts hit, once you turn it on in the app; no storm mode is listed for the EcoFlow DELTA 2.
Can it charge off-peak? The EcoFlow DELTA 3 Classic runs timed missions to charge off-peak and discharge at peak rates; no such schedule is listed for the EcoFlow DELTA 2.
Does it work as a UPS? The EcoFlow DELTA 3 Classic switches to battery in 10ms. EcoFlow’s spec page 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, output control and charge limits.
Warranty and support
EcoFlow US gives the EcoFlow DELTA 3 Classic 3 years, extended to 5 when you register it in the app. EcoFlow’s US warranty table lists the EcoFlow DELTA 2 at 5 years, with nothing to register.
Same 5 years at best; only the Classic needs registering.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. EcoFlow US doesn’t publish a cycle rating for the DELTA 3 Classic.
- If you choose the DELTA 3 Classic, register it in the EcoFlow app the day it arrives: without registration, the warranty stops at 3 years.
- If you find a DELTA 2 from another seller, keep the receipt: EcoFlow’s US warranty table lists it at 5 years.
What reviewers report
We have not lab-tested these two units. Here is what 6 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 Classic: Basic Tutorials (March 2026, EU 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
- ClassicReviewer At over 1,800W the battery ran from full to 0 percent in just over 30 minutes. Basic Tutorials, Simon Lüthje, March 2026, EU 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 2Reviewer Solar charging took three hours with 500W of solar input. SlashGear, Ewdison Then
- ClassicReviewer A full wall charge took just under 55 minutes on the European unit (1,400W AC input). Flag: 230V charging. Basic Tutorials, Simon Lüthje, March 2026, EU unit
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
- ClassicReviewer Battery temperature in the app climbed from 35 to 53 degrees C during the high-load grill test, with audible fans. Basic Tutorials, Simon Lüthje, March 2026, EU unit
UPS and output
- ClassicReviewer It held about 1.83kW of output on an electric grill from full down to empty, with no drop in power. Basic Tutorials, Simon Lüthje, March 2026, EU unit
Daily use and issues
- ClassicReviewer There is no 12-volt car socket for DC devices like cool boxes. Basic Tutorials, Simon Lüthje, March 2026, EU unit
Practical limits before you buy
- EcoFlow US no longer sells the DELTA 2. Its US page now redirects to the DELTA 3; EcoFlow’s US warranty table still lists it at 5 years, but check the seller before buying one.
- The Classic has three AC outlets. Plan a power strip if you plug in more than three devices.
- The Classic has no 12V car socket and no DC barrels.
- The Classic can’t be expanded. 1,024Wh is the ceiling; the DELTA 3 has a battery port.
- Neither runs a microwave and a coffee maker together. Both stop at 1,800W continuous.
- X-Boost is for heating loads only. Motors need the 1,800W rating.
- Smart Generator auto start doesn’t work with the Classic. EcoFlow’s US page limits it to the DELTA 3, DELTA 3 Plus and DELTA 3 Ultra Plus.
- Register the Classic in the EcoFlow app for its 5-year warranty.
Frequently asked questions
Is the DELTA 3 Classic the replacement for the DELTA 2?
Not exactly. EcoFlow US redirects its DELTA 2 page to the DELTA 3, which keeps six outlets, a 12V socket and a battery port. The Classic is a simpler 1kWh DELTA 3 with three outlets and no expansion.
Do they have the same battery?
Same 1,024Wh of LFP and the same 1,800W continuous rating. StorageReview measured 850Wh out of a DELTA 2 at a 270W load.
Should I replace my DELTA 2 with a Classic?
No. Same battery size, fewer outlets. The Classic’s real gains are the 10ms UPS and slightly faster charging; if those don’t matter to you, keep the DELTA 2.
Which is better as a UPS?
The Classic: 10ms. EcoFlow’s spec page gives no time for the DELTA 2; reviewers quote about 30ms for its EPS mode.
Can the Classic run a 12V fridge?
Not from a 12V socket: it has none. Use the fridge’s AC adapter, or choose the DELTA 3, which has a car socket.
Which charges faster?
The Classic, 1,400W against 1,200W: about 60 minutes to full against about 80. From solar, both take 500W.
How long will each run a refrigerator?
At a 60W average: about 14.5 hours on either.
Can I add a battery to either?
The DELTA 2 takes one DELTA 2 or DELTA Max extra battery; the Classic takes none.
How loud are they?
EcoFlow rates the Classic at 30dB or less at 600W. The Technology Man measured the DELTA 2 at 58dB at 1 m with its fans at full speed during fast charging.
Is there a third option?
Yes: the DELTA 3 restores the DELTA 2’s six outlets, 12V socket and battery port, with a 10ms UPS.
Related comparisons and reviews
How we compared and sources
Research-based comparison. We have not physically tested these two units. DELTA 2 specs come from EcoFlow Canada’s page for the same 120V model, because EcoFlow US redirects its DELTA 2 page to the DELTA 3; DELTA 3 Classic specs from EcoFlow US and its manual. Usage observations are attributed to named reviewers. Checked on October 30, 2026.
- Specs: EcoFlow Canada, DELTA 2 and EcoFlow US, DELTA 3 Classic, read on October 30, 2026.
- 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 Classic: Basic Tutorials, Simon Lüthje, March 2026, EU unit.
- Runtime = capacity × 0.85 ÷ watts. Solar harvest = min(panel watts, max input) × sun hours × 0.70.
Same 1,024Wh. The Classic adds a 10ms UPS and faster charging; the DELTA 2, no longer sold by EcoFlow US, kept six outlets and 12V.
Prices checked November 5, 2026 at 4:59 AM EST
Looking at other models? Browse all power station comparisons, or pick any two models on the hub and we point you to the right duel.
Originally published: November 1, 2026