DELTA 3
- you’ll carry it: 27.6 lb
- a PC or a router needs the 10ms UPS
- you’d rather add a battery later
DELTA 3 1500
- you want 1,536Wh without a second box
- you already own one, or find a kit you can buy
- four USB-A and a car cable in the box matter
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.
Half a kilowatt-hour more for 8.4 lb, in a box the same size. The catch is finding one.
The EcoFlow DELTA 3 stores 1,024Wh, the EcoFlow DELTA 3 1500 stores 1,536Wh, and both deliver 1,800W from six AC outlets in nearly the same 15.7-inch case. The 1500 is 50 percent more runtime for 36 lb instead of 27.6 lb, but it switches to battery in 15ms instead of 10ms and is rated for 3,000 cycles to 70 percent instead of 4,000 to 80. In the US, EcoFlow sells the 1500 only as a solar kit, sold out when we checked; if you need more than 1kWh today, the DELTA 3 with an extra battery or the DELTA 3 Max is what you can actually buy.
Below: what the extra 512Wh changes with numbers, a 20-second calculator for your own gear, eight modeled situations, a third option, and what published tests found on each.
Same inverter, same six outlets, same 500W solar input. The DELTA 3 1500 adds 512Wh, 50 percent more runtime, for 8.4 lb more. The DELTA 3 has the faster 10ms UPS, the higher cycle rating and the stronger IP65 battery rating, and it is the one EcoFlow US sells on its own today.
- you protect a PC: 10ms
- you carry it: 27.6 lb
- you want 4,000 cycles to 80%
- you want 1,536Wh in one box
- a CPAP with humidifier must last two nights
- you charge a lot over USB-A
The five differences that decide it
Both use LFP cells, deliver 1,800W with a 3,600W surge and 2,200W of X-Boost, have six AC outlets, a 126W car socket and two DC barrels, take 500W of solar on one XT60i port and charge at 1,500W from the wall. 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 the DELTA 3 and 1,306Wh on the DELTA 3 1500; OutdoorGearLab measured 870Wh from the DELTA 3, and mybest 1,310Wh from a Japanese 1500.
Appliance for appliance, the DELTA 3 1500 lasts 50% longer than the DELTA 3.
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What it costs to get past 1kWh today
Both routes on the second card go past the 1500’s 1,536Wh. The DELTA 3 plus an extra battery keeps six outlets and lets you buy the battery later; the Max puts 2,048Wh and 2,400W in one box but has four outlets and no battery port. EcoFlow US prices move often; these figures are refreshed daily.
The third option: the DELTA 3 Max at $879
EcoFlow DELTA 3 Max: $879 today
If you wanted the 1500 for one bigger battery in one box, the DELTA 3 Max is the answer: 2,048Wh, 2,400W with a 4,800W surge, a 10ms UPS and the same 500W solar input, at 44.8 lb. It has four AC outlets instead of six and cannot take an extra battery. Our DELTA 3 Max review goes deeper. See the DELTA 3 Max at EcoFlow.
Eight modeled situations, worked out
Same formula as the calculator above, with 0 extra batteries. The fridge averages 60W, about 525kWh a year, in the range printed on typical EnergyGuide labels; that average does not include compressor startup surges.
24-hour outage, essentials only
The DELTA 3 gets you through an evening; the 1500 through the evening and most of the night. Neither covers a full day alone; one DELTA 3 Extra Battery on either one does.
CPAP with humidifier, two nights
Only the 1500 covers two full nights out of the box. The DELTA 3 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 DELTA 3’s 10ms leaves margin; the 1500’s 15ms leaves almost none, so a PC may reboot. For appliances, lights and routers, both are fine.
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 in ideal conditions.
Two nights in a van
Both run the 12V fridge from their car socket. The 1500 lasts about 4.5 hours longer; with an 800W Alternator Charger, either refills while you drive.
Home office through an outage
The 1500 runs the office about 5.5 hours longer, but the DELTA 3’s 10ms switchover is the safer one for the desktop PC.
A full-size fridge, nothing else
The 1500 keeps food cold about 7 hours longer on one charge, close to a full day. 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 portable station fast. Use the low setting, heat one small room, and treat the station as a bridge, not a heating plan.
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 and DELTA 3 1500 weight, dimensions and full specifications
Weight: 27.6 lb for the DELTA 3 and 36 lb for the DELTA 3 1500. Dimensions: 15.7 × 8.0 × 11.2 in and 15.7 × 8.3 × 11.1 in. Everything else is in the sheet below.
EcoFlow DELTA 3 and DELTA 3 1500 full specifications
Every published figure for both units, grouped. Green marks the better value.
What’s in the box
DELTA 3
- DELTA 3 power station1,024Wh, 27.6 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 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
Box contents from the DELTA 3 and DELTA 3 1500 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 carBoth: 1,500W X-Stream AC charging
Our solar times divide capacity by input power, with panels at 70% of their rating.
Every port, side by side
DELTA 3
DELTA 3 1500
Practical consequence: the two are the same box on the outside except for USB-A, where the 1500 has four ports to the DELTA 3’s two. Both have one battery port.
09 · NoiseNoise: DELTA 3 vs DELTA 3 1500
Only the EcoFlow DELTA 3 has a published noise rating: under 30dB at 600W. EcoFlow gives no figure for the EcoFlow DELTA 3 1500.
EcoFlow’s figures, measured at 1 m. We found no independent measurement for either model yet.Every figure we found, with its source
No decibel figure published.
Measured by a tester Brand figure
- Cap the AC charging speed in the EcoFlow app overnight.
Cold, heat and storage: DELTA 3 vs DELTA 3 1500
The EcoFlow DELTA 3 and the EcoFlow DELTA 3 1500 share the same limits: charging from 32°F to 113°F, running from 14°F to 113°F. The DELTA 3’s battery pack has the stronger water rating, IP65 against IP54.
Figures from the DELTA 3 and DELTA 3 1500 user manuals and EcoFlow US pages.- Charge it 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 is the better UPS, at 10ms. The EcoFlow DELTA 3 1500 matches it on expansion, generator charging and the app.
Same EcoFlow app over Wi-Fi and Bluetooth. The gap is switchover speed.Green zone: a switch under about 16ms, which most desktop PCs ride through without restarting.
Does it prepare for storms? EcoFlow lists a storm warning feature for the EcoFlow DELTA 3; none is listed for the EcoFlow DELTA 3 1500.
Does it work as a UPS? The EcoFlow DELTA 3 switches in 10ms, comfortably under the roughly 16ms a desktop PC power supply rides through. The EcoFlow DELTA 3 1500 takes 15ms, which leaves almost no margin for a PC.
Can you add a battery later? Both take one DELTA 3, DELTA 2, DELTA 2 Max or DELTA Pro 3 Extra Battery.
Does it work with EcoFlow’s Smart Generator? EcoFlow’s US pages list the Smart Generator 3000 for both; for the 1500 it says the generator tops the battery up automatically.
How does the app connect? Both use the EcoFlow app over Wi-Fi or locally over Bluetooth, with adjustable AC charging speed and charge limits.
Warranty and support
The EcoFlow DELTA 3 and the EcoFlow DELTA 3 1500 both get 5 years from EcoFlow US with nothing to register. The DELTA 3 carries the higher cycle rating.
Same term; the gap is the rated cycle life.Subject to each brand’s warranty terms and eligibility.
EcoFlow rates the DELTA 3 at 4,000 cycles to 80% capacity, about 11 years at one full cycle a day, and the DELTA 3 1500 at 3,000 cycles to 70%, about 8 years. Heat and age also wear a battery, so read any rating as a ceiling.
- Neither needs registration for its 5 years.
- The 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 owners and 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: OutdoorGearLab (July 2026)DELTA 3 1500: GladiatorUp (October 2026), mybest (Japan) (July 2026, Japanese unit)
Usable capacity
- DELTA 3Reviewer OutdoorGearLab measured 870Wh of usable AC energy from the 1,024Wh pack, about 85 percent. OutdoorGearLab, Kenji Mowrey, July 2026
- 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 3Reviewer A full wall charge took 50 minutes in their test, a little faster than the 56 minutes EcoFlow advertises. OutdoorGearLab, Kenji Mowrey, July 2026
- 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
UPS and output
- DELTA 3Reviewer It kept a refrigerator running overnight in their use. OutdoorGearLab, Kenji Mowrey, July 2026
- 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 3Reviewer Only three of the six AC outlets are grounded three-prong sockets, which limits multi-appliance setups. OutdoorGearLab, Kenji Mowrey, July 2026
- DELTA 3Reviewer Measured weight was 28.1 lbs, slightly heavy and long for the 1,000Wh class. OutdoorGearLab, Kenji Mowrey, July 2026
- 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 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 DELTA 3’s 10ms is the safer choice.
- Same 1,800W ceiling. A microwave and a coffee maker together overload either one.
- X-Boost is for heating loads only and switches off while the station is plugged into the wall.
- Same 500W solar input. The 1500 takes about 1.5 hours more sun to refill.
- Only three of the DELTA 3’s six AC outlets are grounded three-prong sockets, as OutdoorGearLab notes; check your plugs.
- Neither ships with a solar cable. Only the 1500 includes a car charging cable.
- DELTA 3, per its US documentation: Single solar input: 11-60V, 500W max (the DELTA 3 Plus has two).
- DELTA 3, per its US documentation: AC charging and Smart Generator charging capped at 1500W; full charge in 56 minutes.
- DELTA 3, per its US documentation: USB-C limited to 100W per port and USB-A to 18W (lower than the DELTA 3 Plus: 140W and 36W).
- DELTA 3, per its US documentation: Expandable to 5kWh with DELTA 3, DELTA 3 Plus, DELTA Pro 3, DELTA 2 or DELTA 2 Max extra batteries.
- DELTA 3 1500, per its user manual: Single XT60i port shared by solar and car charging: solar 11-60V, 15A, 500W max; car input 12V, 8A max.
Frequently asked questions
What is the difference between the DELTA 3 and the DELTA 3 1500?
The 1500 stores 1,536Wh against 1,024Wh, 50 percent more, in nearly the same case, for 36 lb instead of 27.6 lb. Output, outlets, solar input and wall charging power are the same. The DELTA 3 switches to battery faster (10ms against 15ms) and carries a higher cycle rating.
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. EcoFlow does not list it on its own there.
Can either be expanded?
Yes, each has one battery port. With a DELTA 3 Extra Battery (1,024Wh), the DELTA 3 reaches 2,048Wh and the 1500 2,560Wh; with a DELTA Pro 3 Extra Battery, about 5kWh and 5.5kWh.
How long will each run a refrigerator?
At a 60W average: about 14.5 hours on the DELTA 3 and 21.8 hours on the 1500.
Which is better as a UPS for a computer?
The DELTA 3, at 10ms. The 1500’s 15ms is just under the roughly 16ms many desktop power supplies ride through, so a PC may reboot.
Which charges faster?
Both draw 1,500W from the wall and 500W from solar, so the smaller DELTA 3 refills sooner: 56 minutes against 90 from the wall, per EcoFlow.
How much do they weigh?
27.6 lb for the DELTA 3 and 36 lb for the 1500, per EcoFlow US.
Do reviews confirm the rated capacity?
DELTA 3: OutdoorGearLab measured 870Wh of usable AC energy, about 85 percent. DELTA 3 1500: mybest measured 1,310Wh from a Japanese unit, also about 85 percent. Our calculator uses 85% of the rating.
Do I have to register for the 5-year warranty?
No, EcoFlow’s US warranty table lists both at 5 years with no registration condition.
What should I buy instead of the 1500?
If 1kWh is enough to start, the DELTA 3, with an extra battery later. If you want more in one box now, the DELTA 3 Max at 2,048Wh.
Can both charge from an EcoFlow Smart Generator?
Yes, EcoFlow’s US pages list the Smart Generator 3000 (Dual Fuel) for both, and say it tops up the 1500 automatically.
Are the two the same size?
Almost: 15.7 × 8.0 × 11.2 in for the DELTA 3 and 15.7 × 8.3 × 11.1 in for the 1500.
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 and EcoFlow US, DELTA 3 1500 Solar Generator, read on October 31, 2026.
- DELTA 3 1500 ports, UPS type, temperatures and box contents: EcoFlow’s DELTA 3 1500 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.
- Warranty: EcoFlow’s US warranty policy table.
- 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: OutdoorGearLab, Kenji Mowrey, July 2026; 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.
The 1500 adds 512Wh for 8.4 lb; the DELTA 3 switches in 10ms instead of 15ms and is the one EcoFlow US sells on its own.
Prices checked November 5, 2026 at 6:30 AM EST
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Originally published: November 2, 2026