DELTA 3 1500
- you already own one, or find a kit in stock when you check
- you want 1,536Wh and six outlets in one box
- you’ll add a battery later
DELTA 3 Classic
- you’re buying new today
- a PC rides on it: 10ms UPS
- you’ll carry it: 26.6 lb
Prices and stock checked by our price engine on November 13, 2026 at 9:29 AM EST. Each product is rechecked several times a day; the time refreshes when you load the page.
The 1500 is the bigger, better-equipped box. The Classic is the one you can order.
The EcoFlow DELTA 3 1500 stores 1,536Wh and delivers 1,800W from six AC outlets, adds four USB-A ports, a 12V car socket, two DC barrels and a battery port for about 5.5kWh, at 36 lb; but it switches to battery in 15ms, and EcoFlow US sells it only as a solar kit, sold out when we checked. The EcoFlow DELTA 3 Classic stores 1,024Wh and delivers the same 1,800W from three outlets at 26.6 lb, with a 10ms UPS and a one-hour wall refill, but no 12V output and no battery port. If you own a 1500, it does more than a Classic; buying new, the Classic is the simple 1kWh, and the DELTA 3 is the box with the 1500’s ports.
Below: the five differences with numbers, a 20-second calculator for your own gear, eight modeled situations, what the current models cost, a third option, and what published tests found.
Same 1,800W inverter and 500W solar input. The 1500 stores 50 percent more, has twice the AC outlets, four USB-A ports, 12V outputs and a battery port, and a 5-year warranty with nothing to register. The Classic weighs 9.4 lb less, switches in 10ms instead of 15ms, refills from the wall 30 minutes sooner, and is the one EcoFlow US sells on its own.
- you want 1,536Wh in one box
- you use 12V gear
- you’ll grow to 5.5kWh
- you protect a PC: 10ms
- you carry it: 26.6 lb
- you want a one-hour refill
The five differences that decide it
Both use LFP cells, deliver 1,800W, take 500W of solar on one XT60i port, charge from the wall at 1,400 to 1,500W and use the EcoFlow app over Wi-Fi and Bluetooth. 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 1,306Wh usable on the DELTA 3 1500 and 870Wh on the Classic; mybest measured 1,310Wh from a Japanese 1500.
Appliance for appliance, the DELTA 3 1500 lasts 50% longer than the Classic.
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What the current models cost today
The DELTA 3 keeps the 1500’s six outlets, 12V outputs and battery port with a 10ms UPS; with one extra battery it passes the 1500’s 1,536Wh. The Max puts 2,048Wh and 2,400W in one box, with four outlets and no battery port. EcoFlow US prices move often; these figures are refreshed daily.
The third option: the DELTA 3 at $579
EcoFlow DELTA 3: $579 today
The current box closest to the 1500: same 1,800W, six AC outlets, a 126W car socket, two DC barrels and a battery port to about 5kWh, with the Classic’s 10ms UPS and a 56-minute wall refill, at 27.6 lb and 5 years of warranty. It stores 1,024Wh, like the Classic; one DELTA 3 Extra Battery takes it to 2,048Wh. OutdoorGearLab measured 870Wh out of it. Our DELTA 3 review goes deeper. See the DELTA 3 at EcoFlow.
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
The 1500 gets you through the evening and most of the night; the Classic through the evening. Neither covers a full day alone.
CPAP with humidifier
Only the 1500 covers two full nights. The Classic covers one night and part of the second; without the humidifier (40W) it covers about 2.7 nights.
A desktop PC through a grid drop
Many desktop power supplies ride through roughly 16ms. The Classic’s 10ms leaves margin; the 1500’s 15ms leaves almost none, so a PC may reboot.
A 12V fridge in a van
The 1500 feeds it from its car socket or a DC barrel. The Classic has no 12V output, so the fridge runs through an AC outlet with its own adapter. GladiatorUp’s owner runs a 26-quart fridge from his 1500 on weekend trips.
Refill from solar, 500W of panels
Same 500W limit, so the 1500 needs about 1.5 hours more sun. EcoFlow quotes 3.5 hours for the 1500 and about 2.5 for the Classic in ideal conditions.
Refill from the wall before a storm
The Classic is full about half an hour sooner, with less to put back.
A 1,500W space heater on high
Heaters drain any portable station fast. Use the low setting and treat the station as a bridge, not a heating plan.
Moving it
Both have the same 15.7-inch footprint. GladiatorUp’s owner treats his 36 lb 1500 as semi-permanent vehicle gear; the Classic is the easier carry.
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 3 1500 and DELTA 3 Classic weight, dimensions and full specifications
Weight: 36 lb for the DELTA 3 1500 and 26.6 lb for the DELTA 3 Classic. Dimensions: 15.7 × 8.3 × 11.1 in and 15.7 × 7.9 × 11.1 in. Everything else is in the sheet below.
EcoFlow DELTA 3 1500 and EcoFlow DELTA 3 Classic full specifications
Every published figure for both units, grouped. Green marks the better value.
What’s in the box
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 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
- No car charging cablesold separately, per the manual
Box contents from the two user manuals. In the US the 1500 is sold only as a kit, which adds a solar panel.
07 · ChargingHow fast each one refills
Shorter bar, faster refill. Each row is scaled to its slower unit.
Both: one XT60i port for solar or carClassic: Basic Tutorials needed just under 55 minutes for a full charge on a 230V EU unit
Our solar times assume panels deliver 70% of their rating; the brands’ figures assume ideal sun.
Every port, side by side
DELTA 3 1500
DELTA 3 Classic
Practical consequence: the 1500 has three more AC outlets, three more USB-A ports, a car socket, two DC barrels and a battery port. The Classic has AC and USB only.
09 · NoiseNoise and heat: DELTA 3 1500 vs Classic
EcoFlow rates the EcoFlow DELTA 3 1500 at no published rating and the EcoFlow DELTA 3 Classic at 30dB or less at 600W.
EcoFlow’s figures first; reviewer reports where we found one.Every figure we found, with its source
No decibel figure published.
What reviewers heard: During a high-load grill test, battery temperature in the app climbed from 35 to 53°C, with audible fans (Basic Tutorials, EU unit).
Measured by a tester Brand figure
- Lower the AC charging speed in the EcoFlow app overnight: the fans run hardest while fast charging.
Cold, heat and storage: DELTA 3 1500 vs Classic
The EcoFlow DELTA 3 1500 and the EcoFlow DELTA 3 Classic share the same limits: charging from 32°F to 113°F, running from 14°F to 113°F. Only the DELTA 3 1500’s battery pack carries an IP54 rating.
Figures from the DELTA 3 1500 manual and the DELTA 3 Classic 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 adds expansion and a Smart Generator link; the EcoFlow DELTA 3 Classic adds Storm Guard and a faster UPS.
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 3 1500 takes one extra battery on its XT150 port, to about 5.5kWh; the EcoFlow DELTA 3 Classic has no extra battery port.
Does it prepare for storms? The EcoFlow DELTA 3 Classic charges ahead of severe weather with Storm Guard; EcoFlow lists no such feature for the EcoFlow DELTA 3 1500.
Does it work with EcoFlow’s Smart Generator? The EcoFlow DELTA 3 1500 is topped up automatically by EcoFlow’s Smart Generator 3000 (Dual Fuel); the EcoFlow DELTA 3 Classic doesn’t work with the Smart Generator 3000’s automatic start-stop, per EcoFlow.
Does it work as a UPS? The EcoFlow DELTA 3 1500 is a standby UPS with a 15ms transfer, which leaves little margin for a desktop PC; the EcoFlow DELTA 3 Classic switches in 10ms.
How does the app connect? Both use the EcoFlow app over Wi-Fi and Bluetooth for monitoring, charge limits and output control.
Warranty and support
EcoFlow gives the EcoFlow DELTA 3 1500 5 years with nothing to register, per its US warranty listing, and the EcoFlow DELTA 3 Classic 3 years, plus 2 more once registered in the EcoFlow app. A DELTA 3 1500 you already own keeps the term it was sold with.
Same 5 years at most; only the DELTA 3 1500 needs no registration.Subject to each brand’s warranty terms and eligibility.
For the DELTA 3 1500, 3,000 cycles to 70%, about 8 years at one full cycle a day. For the DELTA 3 Classic, no cycle count on its US page; EcoFlow quotes 10 years of reliable power. Heat and calendar age also wear a battery, so read any rating as a ceiling.
- If you choose the EcoFlow DELTA 3 Classic, register it in the EcoFlow app the day it arrives: without registration, the warranty stops at 3 years.
- The DELTA 3 1500’s manual voids coverage if it sits more than six months without a charge and discharge: cycle it every three months in storage.
What reviewers report
We have not lab-tested these two units. Here is what 3 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 3 1500: GladiatorUp (October 2026), mybest (Japan) (July 2026, Japanese unit)DELTA 3 Classic: Basic Tutorials (March 2026, EU unit)
Usable capacity
- 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
- 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 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
- 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
- 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
- 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
- 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
- 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
- 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 sells the DELTA 3 1500 only as a solar kit. All three kit versions were sold out on October 31, 2026; a unit sold elsewhere may carry different warranty terms.
- 15ms is borderline for desktop PCs. For a computer on UPS, the Classic’s 10ms is the safer choice.
- The Classic has no 12V socket and no battery port. Basic Tutorials flagged the missing socket for cool boxes and other DC gear.
- Same 1,800W ceiling. A microwave and a coffee maker together overload either one.
- X-Boost is for heating loads only and, on the 1500, switches off while it is plugged into the wall.
- The Classic’s surge figure differs: 3,000W in its manual, 3,600W on its product page.
- Register the Classic in the app for its full 5 years; the 1500 needs nothing.
Frequently asked questions
What is the difference between the DELTA 3 1500 and the DELTA 3 Classic?
The 1500 stores 1,536Wh against 1,024Wh, has six AC outlets against three, four USB-A ports, a 12V car socket, two DC barrels and a battery port. The Classic weighs 26.6 lb against 36 lb, switches in 10ms instead of 15ms, and refills from the wall in about 60 minutes instead of 90.
Can I buy the DELTA 3 1500 in the US?
Only as a solar kit on EcoFlow’s US store, and all three versions were sold out when we checked on October 31, 2026.
Which is better as a UPS for a computer?
The Classic, at 10ms. The 1500’s 15ms is just under the roughly 16ms many desktop power supplies ride through.
How long will each run a refrigerator?
At a 60W average: about 21.8 hours on the 1500 and 14.5 hours on the Classic.
Can either be expanded?
Only the 1500, through one XT150 port, to about 5.5kWh. The Classic has no battery port.
Which charges faster?
The Classic: full in about 60 minutes from the wall against 90, and about 2.9 hours of good sun against 4.4 at 500W.
How much do they weigh?
36 lb for the 1500 and 26.6 lb for the Classic, per EcoFlow US.
What should I buy instead of the 1500?
If you want its six outlets, 12V and battery port, the DELTA 3. If you want more battery in one box, the DELTA 3 Max at 2,048Wh. If 1kWh and three outlets are enough, the Classic.
Related comparisons and reviews
How we compared and sources
Research-based comparison. We have not physically tested these two units. Specs come from EcoFlow US pages and user manuals; usage observations are attributed to named reviewers. Prices and availability were checked on October 31, 2026.
- Specs: EcoFlow US, DELTA 3 1500 Solar Generator and its user manual (EF-DL-H15-3), and EcoFlow US, DELTA 3 Classic and its user manual (EF-DL3-C), read on October 31, 2026; warranty terms from the EcoFlow US warranty policy.
- DELTA 3 1500 ports, UPS type, temperatures and box contents: its user manual (EF-DL-H15-3), which covers the 120V model; AC outlet count derived from the 15 outputs on EcoFlow Canada’s page for the same 120V model. Availability: EcoFlow US lists no standalone DELTA 3 1500; all three solar kit versions were sold out on October 31, 2026.
- Reviewer reports on the DELTA 3 1500: GladiatorUp, Doug Stokes, October 2026, mybest (Japan), Asuka Fukuda, July 2026, Japanese unit; 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. Cost per lifetime kWh = price ÷ (cycles × capacity in kWh).
Same 1,800W. The 1500 adds 512Wh, three outlets, 12V and a battery port; the Classic switches in 10ms and is the one EcoFlow US sells on its own.
Prices checked November 13, 2026 at 9:29 AM EST
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Originally published: November 9, 2026