DELTA 2 Max
- you want six AC outlets on one unit
- your loads stay under 2,400W, for $120 less
- 6,144Wh with two batteries is enough
DELTA 3 Max Plus
- you run up to 3,000W at once
- a PC or a CPAP needs a sub-10ms UPS
- you want a 12V Anderson port or room to 10kWh
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 2,048Wh battery. $120 more buys 600W of extra output and a UPS three times faster.
The EcoFlow DELTA 2 Max and the EcoFlow DELTA 3 Max Plus store the same 2,048Wh of LFP and take the same 1,000W of solar on two ports. The DELTA 3 Max Plus delivers 3,000W instead of 2,400W, switches to battery in under 10ms instead of 30ms, adds a 30A Anderson port and expands to 10kWh. The DELTA 2 Max keeps six AC outlets instead of four.
Below: every difference with numbers, a 20-second calculator for your own gear, six modeled situations, and what reviewers report on the DELTA 3 Max Plus.
Same battery, same solar input, both expandable. The DELTA 3 Max Plus costs $120 more for 600W more output, a faster UPS and a 30A 12V port; the DELTA 2 Max keeps two more AC outlets.
- you want six AC outlets
- your loads stay under 2,400W
- you want 2,048Wh with six AC outlets
- you run up to 3,000W
- you protect a computer: under 10ms
- you power a 12V fridge or heater: 30A Anderson
The five differences that decide it
The five gaps that decide the purchase, with the better spec for most buyers flagged. Both store 2,048Wh of LFP, take 1,000W of solar on two ports, charge at 1,800W from the wall, work with EcoFlow’s 800W Alternator Charger and use the EcoFlow app.
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 both.
Same battery, same runtime.
The DELTA 2 Max and the Max Plus both hold about 1,741Wh usable, so every appliance runs just as long on either one.Get our Black Friday alerts for EcoFlow
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The price gap, in numbers
Same 2,048Wh battery: the EcoFlow DELTA 2 Max costs $120 less than the EcoFlow DELTA 3 Max Plus.
Prices refresh daily from EcoFlow US.Check today’s price of both before you choose.
EcoFlow US rates the DELTA 2 Max at 3,000 cycles to 80% but doesn’t publish a cycle rating for the DELTA 3 Max Plus, so we skip the price-per-cycle card. EcoFlow US prices move often; the figures here are refreshed daily by our price engine.
The third option: the DELTA 3 Ultra Plus at $1,599
EcoFlow DELTA 3 Ultra Plus: $1,599 today
3,072Wh, 3,600W, 1,600W of solar, a 10ms UPS that StorageReview measured at 8.25ms, a 30A Anderson port and expansion to about 11kWh with DELTA Pro 3 Extra Batteries, at 74.3 lb. Pick it for 3kWh at 120V that can grow. Our DELTA 3 Ultra review goes deeper. See the DELTA 3 Ultra Plus 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
A tie: same battery, same runtime. Either one with a 2,048Wh extra battery covers the second day.
CPAP, two nights
Both cover it with room to spare. If the CPAP stays plugged in through the unit, the Max Plus’s sub-10ms UPS is the safer pick.
Microwave and kettle at once
Only the Max Plus runs both at once. On the DELTA 2 Max, run them one after the other.
Refill from solar, 1,000W of panels
Identical: same battery, same solar limit. The same panels bank the same energy on either.
Two nights in an RV or van
Same runtime. The Max Plus adds a 30A Anderson port for a diesel heater or a bigger DC load; the DELTA 2 Max feeds the fridge from its 126W car socket.
A desktop PC through a grid drop
30ms is longer than many desktop power supplies ride through, so a PC may reboot on the DELTA 2 Max. Under 10ms is the safer bet; the Max Plus also signals the PC over USB-C to shut down cleanly.
A full-size fridge, nothing else
The DELTA 3 Max Plus keeps food cold about 0 min longer on one charge. With solar during the day, either one 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 2 Max and DELTA 3 Max Plus weight, dimensions and full specifications
Weight: 50 lb for the DELTA 2 Max and 48.7 lb for the DELTA 3 Max Plus. Dimensions: 19.6 × 9.5 × 12 in and 19.4 × 9.5 × 12.0 in. Everything else is in the sheet below.
EcoFlow DELTA 2 Max and 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 Max
- DELTA 2 Max2,048Wh, 50 lb
- AC charging cable
- User manual and warranty card
- Solar cable sold separately
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 cablea reviewer flagged both; bundles include the matching cables
- No extra battery, no Alternator Charger, no Anderson adapterall sold separately
DELTA 2 Max: EcoFlow US product page. DELTA 3 Max Plus: user manual. Bundles with a panel, an extra battery or a charger come with the matching cables.
07 · ChargingHow fast each one refills
Shorter bar, faster refill. Each row is scaled to its slower unit; the DELTA 3 Plus fills half the battery.
Both: AC and solar charging togetherBoth: work with EcoFlow’s 800W Alternator Charger
Our solar and alternator times assume panels deliver 70% of their rating and the charger runs at its rated 800W; EcoFlow’s own figures assume ideal conditions.
Every port, side by side
DELTA 2 Max
DELTA 3 Max Plus
Practical consequence: the DELTA 2 Max has two more AC outlets, more USB-A and two DC5521 barrels. The Max Plus trades them for faster USB-C, a 30A Anderson port and an XT150 port for faster DC charging.
09 · NoiseNoise and heat: DELTA 2 Max vs Max Plus
The EcoFlow DELTA 3 Max Plus is the quieter one on paper: EcoFlow rates it at 25dB or less at 600W, and reviewers found its fans rarely ran. EcoFlow publishes no rating for the EcoFlow DELTA 2 Max, whose fans Space.com found fairly loud while charging.
No independent dB measurement of the DELTA 2 Max that we could verify.Every figure we found, with its source
No decibel figure published.
What reviewers heard: Fans come on while charging or under heavier multi-device loads and are fairly loud (Space.com, UK unit); not audible above laptop fans in daily office use (Gadgetoid, UK unit).
What reviewers heard: Fans almost never came on with a home office load, even during a brief spike over 3kW (T3); barely above room noise at 1 m while charging at full power (The Technology Man, UK unit).
Measured by a tester Brand figure
- Cap the AC charging speed in the EcoFlow app overnight.
Cold, heat and storage: DELTA 2 Max vs Max Plus
Only the EcoFlow DELTA 3 Max Plus publishes its limits: charging from 32°F to 113°F, running from 14°F to 113°F. The EcoFlow US page for the EcoFlow DELTA 2 Max gives no temperature range.
Ranges from the DELTA 3 Max Plus manual (EF-DL3-MP); the EcoFlow US DELTA 2 Max page publishes none.- Charge either one above freezing: in winter, bring it indoors.
- For long storage, EcoFlow’s US pages give 68°F to 86°F as the best range: keep some charge in it and top it up every few months.
App, UPS and smart features
The EcoFlow DELTA 3 Max Plus does more: a sub-10ms UPS, Storm Guard, time-of-use and expansion to 10kWh. The EcoFlow DELTA 2 Max keeps AC Always On Mode and grows to 6,144Wh.
Same EcoFlow app over Wi-Fi and Bluetooth. The gap is UPS speed and smart modes.Green zone: a switch under about 16ms, which most desktop PCs ride through without restarting.
Does it prepare for storms? The EcoFlow DELTA 3 Max Plus’s Storm Guard charges ahead of extreme weather, over Wi-Fi; EcoFlow lists no such feature for the DELTA 2 Max.
Can it charge off-peak? The EcoFlow DELTA 3 Max Plus has time-of-use and Scheduled Tasks in the app; EcoFlow lists neither for the DELTA 2 Max.
Can it tell a PC to shut down? The EcoFlow DELTA 3 Max Plus talks to a PC over USB-C; EcoFlow lists no such link for the DELTA 2 Max.
Does it work as a UPS? The EcoFlow DELTA 3 Max Plus switches to battery in under 10ms and talks to a PC over USB-C; EcoFlow rates the EcoFlow DELTA 2 Max’s EPS at 30ms, fine for appliances, borderline for desktop PCs.
Can you add a battery later? The EcoFlow DELTA 2 Max reaches 6,144Wh with two DELTA 2 Max Smart Extra Batteries; the EcoFlow DELTA 3 Max Plus reaches 10kWh, with DELTA Pro 3 batteries. The batteries are not interchangeable.
How does the app connect? Both use the EcoFlow app over Wi-Fi or Bluetooth. The DELTA 2 Max sends a low battery reminder; the Max Plus adds Smart Output Priority.
Warranty and support
Both reach 5 years. The EcoFlow DELTA 2 Max gets them with nothing to do; the EcoFlow DELTA 3 Max Plus gets 3 years, plus 2 more once registered in the EcoFlow app.
Same 5 years at best. Only the Max Plus asks you to do something to get them.Subject to each brand’s warranty terms and eligibility.
EcoFlow US rates the DELTA 2 Max 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 Max Plus; it quotes about 10 years of life. Heat and age also wear a battery, so read any rating as a ceiling.
- If you choose the DELTA 3 Max Plus, register it in the EcoFlow app the day it arrives: without registration, the warranty stops at 3 years.
- The DELTA 2 Max needs no registration to get its full 5 years.
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 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 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 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
- 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
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
- 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
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
- 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
- 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
- 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
Practical limits before you buy
- The DELTA 2 Max stops at 2,400W. A microwave and a kettle together overload it.
- The DELTA 2 Max’s EPS is 30ms. Fine for appliances, borderline for desktop PCs.
- The Max Plus has four AC outlets. Plan a power strip if you run more than four plugs.
- X-Boost is for heating loads only. Motors need 2,400W / 4,800W surge on the DELTA 2 Max, 3,000W / 6,000W on the Max Plus.
- Extra batteries are not interchangeable. DELTA 2 Max batteries fit the DELTA 2 Max; the Max Plus uses DELTA 3 family or DELTA Pro 3 batteries.
- Neither ships with a solar cable.
- Register the DELTA 3 Max Plus in the EcoFlow app for the 5-year warranty: it is 3 years out of the box, plus 2 after registration.
- DELTA 2 Max, per its US documentation: Solar input 11-60V 15A: 500W on a single port, 1,000W only with both ports.
- DELTA 2 Max, per its US documentation: AC input 1800W at 100-120V, 15A max.
- DELTA 2 Max, per its US documentation: Expansion limited to two DELTA 2 Max (or DELTA Max) Smart Extra Batteries, 6kWh total.
- DELTA 2 Max, per its US documentation: Cycle life rated 3000 cycles to 80+% capacity.
- DELTA 3 Max Plus, per its US documentation: Anderson 30A and car outlet share one 12.6V budget: 378W total.
Frequently asked questions
Is the DELTA 3 Max Plus the successor to the DELTA 2 Max?
It is the newer 2,048Wh EcoFlow with an extra battery port, with 3,000W instead of 2,400W and a sub-10ms UPS. The DELTA 2 Max is still sold and keeps six AC outlets.
Do they have the same battery?
Same 2,048Wh of LFP. EcoFlow US rates the DELTA 2 Max at 3,000 cycles; it doesn’t publish a cycle rating for the Max Plus.
How long will each run a refrigerator?
At a 60W average: about 29 hours on either.
Which is better as a UPS?
The DELTA 3 Max Plus: under 10ms, against 30ms for the DELTA 2 Max’s EPS.
Can both be expanded?
Yes. The DELTA 2 Max takes two DELTA 2 Max Smart Extra Batteries for 6,144Wh; the Max Plus reaches 10kWh.
Do they charge at the same speed?
Yes: 1,800W from the wall and 1,000W from solar on both, and both work with EcoFlow’s 800W Alternator Charger.
How much do they weigh?
50 lb for the DELTA 2 Max and 48.7 lb for the DELTA 3 Max Plus.
Can either run a microwave?
Yes, a typical microwave alone. With a kettle on top, only the Max Plus’s 3,000W has room.
Do reviews confirm the rated capacity?
DELTA 2 Max: With a 350W load, the AC inverter delivered 1,800Wh from the 2,048Wh battery (StorageReview). DELTA 3 Max Plus: A full discharge delivered 1.64kWh from the 2,048Wh pack, about 80 percent (StorageReview). Inverter losses usually take 10 to 20% on AC, which is why our calculator uses 85% of the rating.
How loud are the DELTA 2 Max and the DELTA 3 Max Plus?
EcoFlow rates the DELTA 2 Max at no published rating and the DELTA 3 Max Plus at 25dB or less at 600W. Fans ramp up mostly during fast charging and near full output; capping the charging speed in the app is the easiest way to keep either quiet at night.
Do I have to register for the 5-year warranty?
DELTA 2 Max: 5 years. DELTA 3 Max Plus: 3 years, 5 after app registration. Where the extension depends on registration, do it in the EcoFlow app as soon as the unit arrives.
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 documentation and the DELTA 3 Max Plus manual; usage observations are attributed to named reviewers. Prices and availability were checked on October 30, 2026.
- Specs: EcoFlow US, DELTA 2 Max and EcoFlow US, DELTA 3 Max Plus, read on October 30, 2026.
- DELTA 3 Max Plus ports, temperatures and box contents: user manual, model EF-DL3-MP (February 2026 edition, US version).
- DELTA 2 Max EPS switchover: EcoFlow’s 30ms rating, as reported by its distributors and reviewers; not on the US product page.
- 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 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 × 2.048kWh).
Same 2,048Wh. The DELTA 3 Max Plus adds 600W, a sub-10ms UPS and an Anderson port for $120 more; the DELTA 2 Max keeps six outlets.
Prices checked November 13, 2026 at 6:29 AM EST
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Originally published: November 12, 2026