DELTA 2
- you already own one: an extra battery doubles it
- you need six AC outlets
- you carry it: 27 lb
DELTA 3 Max Plus
- you want 2,048Wh and 3,000W
- you’ll use 1,000W of solar
- a PC needs the 10ms 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.
If your DELTA 2 runs out before the night does, the Max Plus is the fix. If it doesn’t, an extra battery for the DELTA 2 may be all you need.
EcoFlow US no longer sells the EcoFlow DELTA 2: its page now redirects to the DELTA 3. The DELTA 2 stored 1,024Wh and delivered 1,800W from six AC outlets, took 500W of solar and one extra battery, at 27 lb. The EcoFlow DELTA 3 Max Plus stores 2,048Wh and delivers 3,000W with a 6,000W surge, takes 1,000W of solar on two ports, switches to battery in 10ms instead of about 30ms and grows to about 10kWh, at 48.7 lb, with four AC outlets and a 30A Anderson port. If you own a DELTA 2 and only need more runtime, add a battery; if you need 3,000W, more solar or a real UPS, the Max Plus.
Below: what changed 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.
If you’re buying today, look at the DELTA 3 Max Plus or the DELTA 3: EcoFlow US no longer sells the DELTA 2. Against it, the Max Plus doubles the battery and the solar input, adds 1,200W of output, a 10ms UPS and a 30A Anderson port, and drops two AC outlets, three USB-A and the DC barrels, for 21.7 lb more.
- you use more than four AC outlets
- an extra battery covers your nights
- you carry it: 27 lb
- you run up to 3,000W
- you’ll use 1,000W of solar
- you protect a PC: 10ms
The five differences that decide it
Both use LFP cells, a 126W car socket, X-Boost for heating loads, 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 870Wh usable on the DELTA 2 and 1,741Wh on the DELTA 3 Max Plus; StorageReview measured 850Wh and 1.64kWh.
Appliance for appliance, the Max Plus lasts twice as long as 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 the current options cost today
Two ways to 2kWh today: the DELTA 3 Max Plus in one box with 3,000W and 1,000W of solar, or a DELTA 3 with its extra battery, which keeps six outlets at 1,800W. The DELTA 3 is where EcoFlow US now sends DELTA 2 shoppers. Prices move often; these figures are refreshed daily.
The third option: the DELTA 3 Plus at $719
EcoFlow DELTA 3 Plus: $719 today
The DELTA 2’s size, updated: 1,024Wh and 1,800W with a 3,600W surge from six AC outlets, a 10ms UPS, 1,000W of solar on two ports, a 56-minute wall refill and expansion to about 5kWh, at 27.6 lb, with a 5-year warranty and no registration condition. Our DELTA 3 Plus review goes deeper. See the DELTA 3 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 Max Plus lasts twice as long out of the box. A DELTA 2 with one extra battery gets close.
CPAP, every night
The DELTA 2 covers a long weekend of nights, the Max Plus most of a week. For a CPAP left plugged in through the unit, the Max Plus’s 10ms switchover is the safer one.
Breakfast during an outage
Only the Max Plus runs both at once. On the DELTA 2, run them one after the other.
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 Technology Man’s desktop PC stayed on through the Max Plus’s 8.4ms handover (UK unit).
Refill from solar, each at its maximum
Twice the battery, twice the solar input: the same time to refill, if you own the panels. CleanTechnica filled its DELTA 2 in 3 hours from solar.
Six plugs at once
The DELTA 2 takes all six plugs. On the Max Plus, add a power strip, keeping the total under 3,000W.
A full-size fridge, nothing else
The Max Plus keeps food cold about 14.5 hours longer on one charge.
Moving it
The DELTA 2 is a one-person carry; the Max Plus weighs 21.7 lb more.
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 Max Plus weight, dimensions and full specifications
Weight: 27 lb for the DELTA 2 and 48.7 lb for the DELTA 3 Max Plus. Dimensions: 15.7 × 8.3 × 11 in and 19.4 × 9.5 × 12.0 in. Everything else is in the sheet below.
EcoFlow DELTA 2 and EcoFlow DELTA 3 Max Plus 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 Max Plus
- DELTA 3 Max Plus power station2,048Wh, 48.7 lb
- AC charging cable
- Manuals and warranty card
- No solar cable, no car cablebundles include the matching cables
- No extra battery, no Alternator Chargerboth sold separately
DELTA 2 box contents from its archived US page; DELTA 3 Max Plus from EcoFlow US and 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 Max Plus: StorageReview measured 2.33kWh drawn from the wall for a full refill
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 Max Plus
Practical consequence: the DELTA 2 had two more AC outlets, three more USB-A ports and two DC barrels. The Max Plus brings a 140W USB-C, a 30A Anderson port for camping gear and an XT150 port for extra batteries, the Alternator Charger or the Smart Generator.
09 · NoiseNoise and heat: DELTA 2 vs Max Plus
The EcoFlow DELTA 3 Max Plus is the quieter one: EcoFlow rates it at 25dB or less at 600W, and The Technology Man found it barely above room noise while charging. The same reviewer measured the EcoFlow DELTA 2 at 58dB with its fans at full during fast charging.
Both reviewer figures are from UK units; the Max Plus rating is EcoFlow’s.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).
What reviewers heard: Even charging at full power the meter barely registered above room noise at 1 m, with exhaust just over 40°C (The Technology Man, UK unit).
Measured by a tester Brand figure
- Lower the AC charging speed in the app overnight.
Cold and heat: DELTA 2 vs Max Plus
The EcoFlow DELTA 2 and the EcoFlow DELTA 3 Max Plus 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 EcoFlow Canada’s DELTA 2 page (same 120V model) and EcoFlow US for the DELTA 3 Max Plus.- Charge either one indoors in winter: neither charges below 32°F.
App, UPS and smart features
The EcoFlow DELTA 3 Max Plus does more: a 10ms UPS, Storm Guard, Smart Output Priority and a 2,600W Smart Generator link. The EcoFlow DELTA 2 matches it on the app and a battery port.
Same EcoFlow app. The gap is switchover speed and home-backup features.Green zone: a switch under about 16ms, which most desktop PCs ride through without restarting.
Can it keep only the essentials running? The EcoFlow DELTA 3 Max Plus lets you choose which outputs stay powered in the app. EcoFlow listed no such feature for the EcoFlow DELTA 2.
Does it prepare for storms? The EcoFlow DELTA 3 Max Plus has Storm Guard, which charges ahead of severe weather. EcoFlow listed no such feature for the EcoFlow DELTA 2.
Does it work as a UPS? The EcoFlow DELTA 3 Max Plus switches in 10ms; StorageReview measured 8ms. EcoFlow gave no switchover time for the EcoFlow DELTA 2; reviewers quote about 30ms for its EPS mode.
Can you add a battery later? The EcoFlow DELTA 2 takes one DELTA 2 or DELTA Max extra battery. The EcoFlow DELTA 3 Max Plus takes extra batteries through its XT150 port toward about 10kWh.
How much can a generator put in? The EcoFlow DELTA 3 Max Plus charges from EcoFlow’s Smart Generator at up to 2,600W through its XT150 port; the EcoFlow DELTA 2 takes a generator through its 1,200W AC input.
How does the app connect? Both use the EcoFlow app over Wi-Fi and Bluetooth.
Warranty and support
EcoFlow’s US warranty table lists the EcoFlow DELTA 3 Max Plus at 3 years, plus 2 more once registered in the EcoFlow app. Its archived US page listed the EcoFlow DELTA 2 at 5 years; an existing unit keeps the term it was sold with.
Register the Max Plus on day one for the full 5 years.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. For the DELTA 3 Max Plus, EcoFlow US quotes about 10 years of use rather than a cycle count. Calendar aging and heat also reduce capacity.
- Register the DELTA 3 Max Plus in the EcoFlow app: without it, the warranty stops at 3 years.
- If you own a DELTA 2, keep your proof of purchase: the term runs from that date.
What reviewers report
We have not lab-tested these two units. Here is what 10 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 Max Plus: StorageReview (September 2025), The Technology Man (January 2026, UK unit), Trusted Reviews (January 2026, UK unit), T3 (January 2026), AndroidGuys (November 2025)
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
- Max PlusReviewer A full discharge delivered 1.64kWh from the 2,048Wh pack, about 80 percent. StorageReview, Dylan Dougherty, September 2025
- Max PlusReviewer A constant 2kW heater load ran just over 57 minutes and delivered 1,898Wh, about 93 percent. The Technology Man, Gidon, January 2026, UK unit
- Max PlusReviewer Discharge efficiency hovered around 87 percent at loads from 200W to 3,000W. Trusted Reviews, David Ludlow, January 2026, UK unit
- Max PlusReviewer Best round-trip efficiency, AC in to AC out, was 79.9 percent. Trusted Reviews, David Ludlow, January 2026, UK 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
- Max PlusReviewer Refilling from empty took 2.33kWh from the wall, about 88 percent charging efficiency. StorageReview, Dylan Dougherty, September 2025
- Max PlusReviewer Fast mode reached 80 percent in 50 minutes and full in about 70 minutes on UK mains. Flag: 230V, up to 2300W input. The Technology Man, Gidon, January 2026, UK unit
- Max PlusReviewer Charging at 2,400W took 2,317Wh of input to fill the battery, 88.39 percent efficient. Flag: UK 230V input. Trusted Reviews, David Ludlow, January 2026, UK unit
- Max PlusReviewer The reviewer confirmed roughly 80 percent in about 47 minutes on AC. Likely UK unit (2,300W input quoted). T3, Matt Kollat, January 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
- Max PlusReviewer Even charging at full power, the meter barely registered above room noise at one metre; exhaust measured just over 40°C. The Technology Man, Gidon, January 2026, UK unit
- Max PlusReviewer Fans almost never came on with a home office load and stayed silent during a brief spike over 3kW. T3, Matt Kollat, January 2026
UPS and output
- Max PlusReviewer Measured UPS transfer time was 8ms on a workstation load. StorageReview, Dylan Dougherty, September 2025
- Max PlusReviewer Oscilloscope measurement showed a clean handover at 8.4ms; a desktop PC under benchmark load stayed on. The Technology Man, Gidon, January 2026, UK unit
- Max PlusReviewer Inverter idle draw with no load was about 22W (100 to 87 percent in 12 hours). The Technology Man, Gidon, January 2026, UK unit
- Max PlusReviewer DC output via the Anderson port delivered 1,892Wh on a 20A load, about 92 percent. The Technology Man, Gidon, January 2026, UK unit
Practical limits before you buy
- EcoFlow US no longer sells the DELTA 2. Its US page now redirects to the DELTA 3; check any seller’s warranty terms before buying a leftover or used unit.
- The Max Plus has four AC outlets, two fewer than the DELTA 2, and no DC barrels.
- The Max Plus’s Anderson port and car socket share 378W.
- The Max Plus ships without a solar or car cable; bundles include them.
- About 30ms is borderline for desktop PCs. Test the DELTA 2’s switchover before relying on it for a computer.
- X-Boost is for heating loads only. Motors need the continuous rating: 1,800W or 3,000W.
- Register the Max Plus in the EcoFlow app for its 5-year warranty: 3 years out of the box.
- Neither charges below freezing.
Frequently asked questions
Is the DELTA 3 Max Plus the replacement for the DELTA 2?
Not exactly. EcoFlow US redirects its DELTA 2 page to the DELTA 3, the same 1kWh size. The Max Plus is the 2kWh step up, with 3,000W, 1,000W of solar and a 10ms UPS, but four outlets instead of six.
Should I replace my DELTA 2 with a DELTA 3 Max Plus?
Only if you need more than 1,800W, more than 500W of solar or a 10ms UPS. For more runtime alone, an extra battery on your DELTA 2 gets you to about 2kWh.
Which is better as a UPS?
The Max Plus: 10ms, and StorageReview measured 8ms. EcoFlow’s spec page gave no time for the DELTA 2; reviewers quote about 30ms for its EPS mode.
How long will each run a refrigerator?
At a 60W average: about 14.5 hours on the DELTA 2 and 29 hours on the Max Plus.
Can the Max Plus run a microwave and a coffee maker together?
Yes, up to 3,000W. The DELTA 2 stops at 1,800W.
Which charges faster?
From the wall, the DELTA 2 reaches 80% in 50 minutes at 1,200W, the Max Plus in 64 minutes at 1,800W with twice the battery. From solar, both refill in about 2.9 hours at their maximum input.
How much do they weigh?
27 lb for the DELTA 2 and 48.7 lb for the DELTA 3 Max Plus.
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 rates the Max Plus at 25dB or less at 600W, and The Technology Man found it barely above room noise while charging (UK unit).
Is there a third option?
Yes: the DELTA 3 Plus keeps the DELTA 2’s 1kWh size and six outlets, adds a 10ms UPS and 1,000W of solar, and expands to about 5kWh.
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 the DELTA 2 and redirects its page to the DELTA 3, so its specs come from the US page as archived on June 2, 2025, completed by EcoFlow Canada’s page for the same 120V model. DELTA 3 Max Plus specs come from EcoFlow US and its manual. 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 Max Plus, its user manual (EF-DL3-MP); read on October 31, 2026. 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 Max Plus: StorageReview, Dylan Dougherty, September 2025, The Technology Man, Gidon, January 2026, UK unit, Trusted Reviews, David Ludlow, January 2026, UK unit, T3, Matt Kollat, January 2026, AndroidGuys, Scott Webster, November 2025.
- 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 Max Plus doubles the battery, adds 1,200W, 1,000W of solar and a 10ms UPS; the DELTA 2, no longer sold by EcoFlow US, had six outlets at 27 lb.
Prices checked November 13, 2026 at 6:29 AM EST
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Originally published: November 9, 2026