DELTA 2 Max
- you run up to 2,400W
- you’ll put up 1,000W of solar
- you’ll grow to 6,144Wh later
DELTA 3 1500
- you already own one, or find a kit for sale
- you carry it: 36 lb
- a router or NAS needs the 15ms UPS
Prices and stock checked by our price engine on November 13, 2026 at 6:29 AM EST. Each product is rechecked several times a day; the time refreshes when you load the page.
Same six outlets and the same ports. The real choice is 14 lb against 600W, and only one of them is easy to buy.
The EcoFlow DELTA 2 Max stores 2,048Wh and delivers 2,400W, takes 1,000W of solar on two ports and grows to 6,144Wh, at 50 lb. The EcoFlow DELTA 3 1500 stores 1,536Wh and delivers 1,800W, takes 500W of solar on one port and weighs 36 lb; it switches to battery in 15ms instead of the DELTA 2 Max’s roughly 30ms. Both have six AC outlets, four USB-A, two 100W USB-C, a car socket and two DC barrels. EcoFlow US sells the 1500 only as a solar kit, sold out when we checked, so for a new purchase the comparison is mostly the DELTA 2 Max against the 1500’s replacement, the DELTA 3 Max.
Below: the differences with numbers, a 20-second calculator for your own gear, eight modeled situations, what the current options cost, a third option, and what published tests found on each.
Same outlets and ports on both. The DELTA 2 Max stores 512Wh more, delivers 600W more, takes twice the solar and grows further. The DELTA 3 1500 weighs 14 lb less, switches in 15ms instead of about 30ms and has an IP54 battery pack. Buying new in the US, the 1500 is sold only as a solar kit, sold out when we checked on October 31, 2026; its replacement is the DELTA 3 Max.
- you run up to 2,400W
- you’ll use 1,000W of solar
- you’ll grow to 6,144Wh
- you carry it: 36 lb
- you want a 15ms switchover
- you already own one
The five differences that decide it
Both use LFP cells and have six AC outlets, two 100W USB-C, four USB-A, a 126W car socket, two DC5521 barrels, an extra battery port and 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 1,741Wh usable on the DELTA 2 Max and 1,306Wh on the DELTA 3 1500; StorageReview measured 1,800Wh out of a DELTA 2 Max at 350W, and mybest 1,310Wh from a Japanese 1500.
Appliance for appliance, the DELTA 2 Max lasts 33% longer than the DELTA 3 1500.
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 the current options cost today
The DELTA 3 Max keeps the 1500’s 10ms-class UPS in a 2,048Wh box with 2,400W, but has four AC outlets and no battery port. The DELTA 2 Max keeps six outlets and the battery port. If you want both a 10ms UPS and room to grow, the DELTA 3 Max Plus. Prices move often; these figures are refreshed daily.
The third option: the DELTA 3 Max Plus at $1,149
EcoFlow DELTA 3 Max Plus: $1,149 today
The DELTA 2 Max’s successor in size: 2,048Wh and 3,000W with a 6,000W surge from four 20A outlets, a 10ms UPS (StorageReview measured 8ms), 1,000W of solar on two ports, a 30A Anderson port and expansion to about 10kWh, at 48.7 lb. Our DELTA 3 Max review covers the platform. See the DELTA 3 Max Plus at EcoFlow.
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 Max covers most of a day, the 1500 the evening and most of the night. One extra battery on either one covers a full day.
CPAP with humidifier, every night
Both cover two full nights. For a CPAP left plugged in through the unit, the 1500’s 15ms switchover is the safer of the two.
Breakfast during an outage
Only the DELTA 2 Max runs both at once. On the 1500, one after the other.
A desktop PC through a grid drop
Many desktop power supplies ride through roughly 16ms. The 1500’s 15ms leaves almost no margin; the DELTA 2 Max’s 30ms leaves none, so a PC may reboot. For a computer, the DELTA 3 Max’s 10ms is the safer buy.
Refill from solar, each at its maximum
The DELTA 2 Max refills a bigger battery about 1.5 hours sooner, with twice the panel input. EcoFlow quotes 3.5 hours for the 1500 in ideal sun.
A full-size fridge, nothing else
The DELTA 2 Max keeps food cold about 7 hours longer on one charge.
A 1,500W space heater on high
Heaters drain any portable station fast. Use the low setting and treat either one as a bridge, not a heating plan.
Moving it
The 1500 is a firm one-person carry; the DELTA 2 Max, 14 lb heavier, is a two-hand lift.
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 Max and DELTA 3 1500 weight, dimensions and full specifications
Weight: 50 lb for the DELTA 2 Max and 36 lb for the DELTA 3 1500. Dimensions: 19.6 × 9.5 × 12 in and 15.7 × 8.3 × 11.1 in. Everything else is in the sheet below.
EcoFlow DELTA 2 Max 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 Max
- DELTA 2 Max2,048Wh, 50 lb
- AC charging cable
- User manual and warranty card
- Solar cable sold separately
- No car charging cable listed
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 Max contents from EcoFlow US; DELTA 3 1500 from its user manual. 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.
DELTA 2 Max: StorageReview measured 2,370Wh drawn from the wall for a full refillDELTA 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 Max
DELTA 3 1500
Practical consequence: the outputs are the same on both, port for port. The DELTA 2 Max adds a second solar input; the 1500 has a single XT60i port shared by solar and car charging.
09 · NoiseNoise: DELTA 2 Max vs DELTA 3 1500
EcoFlow publishes no noise rating for the EcoFlow DELTA 2 Max or the EcoFlow DELTA 3 1500, and no reviewer has measured either in dB. Space.com found the DELTA 2 Max’s fans fairly loud while charging.
No dB figure from EcoFlow or a reviewer for either model.Every figure we found, with its source
No decibel figure published.
What reviewers heard: Fans come on while charging or under heavier loads and are fairly loud (Space.com, UK unit); in office use, not audible above laptop fans (Gadgetoid, 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 Max vs DELTA 3 1500
The EcoFlow DELTA 3 1500‘s manual gives charging from 32°F to 113°F and running from 14°F to 113°F, with an IP54 battery pack. EcoFlow US publishes no range for the EcoFlow DELTA 2 Max.
Figures from the DELTA 3 1500 user manual; the DELTA 2 Max US page gives none.- Charge either one indoors in winter: the 1500 doesn’t charge below 32°F, and EcoFlow gives no range for the DELTA 2 Max.
- For storage, keep the 1500 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 switches faster, at 15ms, and tops up from a Smart Generator automatically. The EcoFlow DELTA 2 Max answers with room for two extra batteries, 6,144Wh in all.
Same EcoFlow app. The gap is switchover speed and expansion.Green zone: a switch under about 16ms, which most desktop PCs ride through without restarting.
Does it work as a UPS? The EcoFlow DELTA 3 1500 is a standby UPS with a 15ms transfer, working only when the wall supplies more than the load. EcoFlow’s US page gives no switchover time for the EcoFlow DELTA 2 Max; reviewers quote EcoFlow’s 30ms EPS figure.
Can you add a battery later? The EcoFlow DELTA 2 Max takes up to two DELTA 2 Max or DELTA Max Smart Extra Batteries. The EcoFlow DELTA 3 1500 takes one DELTA 3 family or DELTA Pro 3 Extra Battery.
Does it work with EcoFlow’s Smart Generator? EcoFlow’s US pages list Smart Generator support for both; for the EcoFlow DELTA 3 1500 it says the Smart Generator 3000 tops the battery up automatically.
Does AC stay on through an outage and recovery? The EcoFlow DELTA 2 Max has an AC Always On mode; on the EcoFlow DELTA 3 1500, the app’s AC timeout can be set to never so an intermittent load like a fridge isn’t cut off.
How does the app connect? Both use the EcoFlow app over Wi-Fi or locally over Bluetooth.
Warranty and support
The EcoFlow DELTA 2 Max and the EcoFlow DELTA 3 1500 both get 5 years from EcoFlow US with nothing to register. Both are rated for 3,000 cycles, to 80% on the DELTA 2 Max and to 70% on the 1500.
Same term; the 1500’s cycle rating ends at a lower capacity.Subject to each brand’s warranty terms and eligibility.
EcoFlow rates the DELTA 2 Max at 3,000 cycles to 80% and 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, 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 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 Max: StorageReview (July 2023), Trusted Reviews (January 2024, UK unit), Digital Trends (June 2023), Space.com (September 2023, UK unit), Gadgetoid (October 2023, UK unit)DELTA 3 1500: GladiatorUp (October 2026), mybest (Japan) (July 2026, Japanese unit)
Usable capacity
- DELTA 2 MaxReviewer With a 350W load, the AC inverter delivered 1,800Wh from the 2,048Wh battery. StorageReview, Kevin OBrien, July 2023
- DELTA 2 MaxReviewer Discharging into a ~1,000W fan heater delivered 1.709kWh, 83.45 percent efficient. Trusted Reviews, David Ludlow, January 2024, UK unit
- 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 2 MaxReviewer A full recharge at the highest rate needed 2,370Wh from the wall. StorageReview, Kevin OBrien, July 2023
- DELTA 2 MaxReviewer A full AC top-up drew 2,203Wh from the wall. Flag: UK 230V charging. Trusted Reviews, David Ludlow, January 2024, UK unit
- DELTA 2 MaxReviewer Wall charging drew a steady 1,590W, 210W below the 1,800W claim but still best in its class then. Digital Trends, Nick Mokey, June 2023
- DELTA 2 MaxReviewer From 30 percent it reached 80 percent in almost exactly 40 minutes on a UK 13A plug. Flag: 230V. Space.com, Tantse Walter, September 2023, 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 2 MaxReviewer Fans come on while charging or under heavier multi-device loads and are fairly loud. Space.com, Tantse Walter, September 2023, UK unit
- DELTA 2 MaxReviewer In daily office use, fan noise was not audible above the laptop fans and heat was minimal. Gadgetoid, Phil (Gadgetoid), October 2023, UK unit
UPS and output
- DELTA 2 MaxReviewer As an EPS, the battery takes over within 30ms, too slow for some servers and medical devices. Trusted Reviews, David Ludlow, January 2024, UK unit
- DELTA 2 MaxReviewer A table saw plus 5HP shop vac ran together at a sustained 2,253W without issue. Digital Trends, Nick Mokey, June 2023
- DELTA 2 MaxReviewer The miter saw tripped it initially; a heater plus heat gun near 2,400W was sustained for the long haul. Digital Trends, Nick Mokey, June 2023
- DELTA 2 MaxReviewer Notes the roughly 30ms switchover makes it poor as a UPS for sensitive desktops. Gadgetoid, Phil (Gadgetoid), October 2023, UK unit
- 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 the DELTA 3 1500 only as a solar kit. Every kit was sold out on October 31, 2026; a unit sold elsewhere may carry different warranty terms.
- Neither is a good UPS for a desktop PC. 15ms leaves almost no margin and about 30ms none; the DELTA 3 Max switches in under 10ms.
- The DELTA 2 Max reaches 1,000W of solar only with both ports used: 500W per port.
- The 1500’s X-Boost is off while it’s plugged in, per its manual.
- X-Boost is for heating loads only. Motors need the continuous rating: 2,400W or 1,800W.
- Extra batteries differ. DELTA 2 Max batteries fit the DELTA 2 Max; the 1500 uses DELTA 3 family or DELTA Pro 3 batteries.
- Cycle the 1500 every few months in storage: its manual voids coverage after six months unused.
- The DELTA 2 Max weighs 50 lb. A two-hand lift.
Frequently asked questions
What is the difference between the EcoFlow DELTA 2 Max and the DELTA 3 1500?
The DELTA 2 Max stores 2,048Wh against 1,536Wh, delivers 2,400W against 1,800W, takes 1,000W of solar against 500W and expands to 6,144Wh. The 1500 weighs 36 lb against 50 lb and switches in 15ms against about 30ms. The outlets and USB ports are the same.
Can I buy the DELTA 3 1500 in the US?
Only as a solar kit on EcoFlow’s US store, and every version was sold out when we checked on October 31, 2026. EcoFlow does not list it on its own there.
What replaces the DELTA 3 1500?
For more than 1.5kWh in one box, the DELTA 3 Max: 2,048Wh, 2,400W and a 10ms UPS, with four AC outlets and no battery port.
Which is better as a UPS?
The 1500, at 15ms, but it leaves almost no margin for a desktop PC. EcoFlow’s US page gives no time for the DELTA 2 Max; reviewers quote EcoFlow’s 30ms EPS figure.
How long will each run a refrigerator?
At a 60W average: about 29 hours on the DELTA 2 Max and 21.8 hours on the 1500.
Which refills faster from solar?
The DELTA 2 Max: about 2.9 hours from 1,000W of panels, against about 4.4 hours from 500W on the 1500, at 70% of panel rating.
How much do they weigh?
50 lb for the DELTA 2 Max and 36 lb for the DELTA 3 1500.
What warranty do they have?
5 years for both, with no registration condition, per EcoFlow’s US warranty table.
Is there a third option?
The DELTA 3 Max Plus: 2,048Wh and 3,000W, a 10ms UPS, 1,000W of solar and expansion to about 10kWh, at 48.7 lb.
Related comparisons and reviews
How we compared and sources
Research-based comparison. We have not physically tested these two units. DELTA 2 Max specs come from EcoFlow US; DELTA 3 1500 specs from EcoFlow’s US solar kit page, its user manual and EcoFlow Canada’s page for the same 120V model. Usage observations are attributed to named reviewers. Prices and availability were checked on October 31, 2026.
- Specs: EcoFlow US, DELTA 2 Max; 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 Max: StorageReview, Kevin OBrien, July 2023, Trusted Reviews, David Ludlow, January 2024, UK unit, Digital Trends, Nick Mokey, June 2023, Space.com, Tantse Walter, September 2023, UK unit, Gadgetoid, Phil (Gadgetoid), October 2023, UK unit; 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).
The DELTA 2 Max adds 512Wh, 600W and twice the solar; the 1500 is 14 lb lighter and switches in 15ms, but EcoFlow US sells it only as a solar kit.
Prices checked November 13, 2026 at 6:29 AM EST
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Originally published: November 8, 2026