DELTA 2 Max
- you want 2,048Wh now, in one box
- you run loads between 1,800 and 2,400W
- you’ll grow to 6,144Wh with two batteries
DELTA 3 Plus
- you’ll carry it: 27.6 lb
- a PC or a CPAP needs the 10ms UPS
- 1kWh covers your nights, for $310 less
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.
$310 buys twice the battery. The DELTA 3 Plus buys a faster UPS and 22 fewer pounds.
The EcoFlow DELTA 2 Max and the EcoFlow DELTA 3 Plus both have six AC outlets, 1,000W of solar input and an extra battery port. The DELTA 2 Max stores 2,048Wh and delivers 2,400W; the DELTA 3 Plus stores 1,024Wh and delivers 1,800W, but weighs 27.6 lb instead of 50 and switches to UPS in 10ms instead of 30ms. For 2kWh at once, the DELTA 2 Max does it in one box; the price section compares both routes at today’s prices.
Below: every difference with numbers, a 20-second calculator for your own gear, six modeled situations, and what reviewers report on the DELTA 3 Plus.
Same six outlets, same 1,000W of solar, both expandable. The DELTA 2 Max costs $310 more and doubles the battery with 600W more output; the DELTA 3 Plus is the newer, lighter unit with a faster UPS.
- you want 2,048Wh without buying a battery
- you run up to 2,400W
- you want the lowest price per Wh
- you carry it: 22 lb lighter
- you protect a computer: 10ms UPS
- you want 4,000 cycles and $310 back
The five differences that decide it
The five gaps that decide the purchase, with the better spec for most buyers flagged. Both have six AC outlets, 1,000W of solar input on two ports, a 12V socket, DC5521 ports, an extra battery port and a 5-year warranty with no registration condition.
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 870Wh on the DELTA 3 Plus.
Appliance for appliance, the DELTA 2 Max lasts twice as long as the Plus.
Same appliance, same watts: the gap is always the size of the battery.Get our Black Friday alerts for EcoFlow
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The price gap, in numbers
The EcoFlow DELTA 2 Max costs $310 more than the EcoFlow DELTA 3 Plus and adds 1,024Wh: that is $0.30 per extra Wh, against $0.70 per Wh for the Plus.
Prices refresh daily from EcoFlow US.What the $310 buys: twice the battery (2,048Wh vs 1,024Wh) and 2,400W instead of 1,800W.
DELTA 2 Max costs $79 less today.
The lifetime figure divides the price by the rated cycles to 80% times the capacity. Read it as a ranking, not a bill. On the second card, the DELTA 2 Max gets to 2kWh in one unit with 2,400W; the DELTA 3 Plus route keeps a lighter base unit and a faster UPS. EcoFlow US prices move often; the figures here are refreshed daily by our price engine.
The third option: the DELTA 3 Max Plus at $1,149
EcoFlow DELTA 3 Max Plus: $1,149 today
2,048Wh, 3,000W, 1,000W of solar on two ports, a 30A Anderson port, a sub-10ms UPS that StorageReview measured at 8ms, and expansion to 10kWh, at 48.7 lb. Pick it if you want 2kWh now with room to grow. Our best EcoFlow power stations guide goes deeper. See the DELTA 3 Max Plus at EcoFlow.
Seven 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
The DELTA 2 Max lasts twice as long out of the box; a DELTA 3 Plus with one extra battery matches it.
CPAP, two nights
Both cover two nights. The DELTA 3 Plus’s 10ms UPS is the safer pick if the CPAP stays plugged into the wall through it.
Breakfast during an outage
Only the DELTA 2 Max runs both at once. On the DELTA 3 Plus, run them one after the other.
Refill from solar, 1,000W of panels
Same solar input, so the smaller battery refills in half the time. Per hour of sun, both bank the same energy.
Two nights in an RV or van
The DELTA 2 Max lasts a night and most of a day; the DELTA 3 Plus needs recharging daily, which 1,000W of solar makes realistic.
A space heater for an hour
Both run it; the DELTA 2 Max runs it about twice as long. Neither is a heating solution for an outage.
A full-size fridge, nothing else
The DELTA 2 Max keeps food cold about 14.5 h longer on one charge. With solar during the day, either one can carry a fridge through a multi-day outage.
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 Plus weight, dimensions and full specifications
Weight: 50 lb for the DELTA 2 Max and 27.6 lb for the DELTA 3 Plus. Dimensions: 19.6 × 9.5 × 12 in and 16 × 8.0 × 11 in. Everything else is in the sheet below.
EcoFlow DELTA 2 Max and DELTA 3 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 Plus
- DELTA 3 Plus1,024Wh, 27.6 lb
- AC charging cable
- Manuals
- Extra battery sold separately
From EcoFlow US product pages.
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.
DELTA 2 Max: AC + solar X-Stream dual chargingDELTA 3 Plus: 800W Alternator Charger via XT150
Our times divide capacity by input power, with solar at 70% of panel rating.
Every port, side by side
DELTA 2 Max
DELTA 3 Plus
Practical consequence: nearly identical port layouts, with six AC outlets each. The DELTA 2 Max adds two USB-A ports; the DELTA 3 Plus has the faster USB-C.
09 · NoiseNoise and heat: DELTA 2 Max vs Plus
Neither is silent. EcoFlow rates the EcoFlow DELTA 3 Plus under 30dB at 600W, but reviewers found its fans running even at low loads; the EcoFlow DELTA 2 Max‘s fans are fairly loud while charging, per Space.com.
EcoFlow publishes no rating for the DELTA 2 Max, and we found no independent dB measurement for either.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 daily office use, not audible above laptop fans, with minimal heat (Gadgetoid, UK unit).
What reviewers heard: Fans ran even at low loads (Trusted Reviews, UK unit); audible over a 700W vacuum, and warmer than expected on light loads (How-To Geek).
Measured by a tester Brand figure
- Cap the AC charging speed in the EcoFlow app overnight.
Cold, heat and storage: DELTA 2 Max vs Plus
EcoFlow US publishes no temperature range on either page. EcoFlow’s DELTA 3 family figures are charging from 32°F to 113°F and running from 14°F to 113°F; the EcoFlow DELTA 3 Plus‘s battery pack is rated IP65, the EcoFlow DELTA 2 Max is not rated.
No range on either US page; EcoFlow’s DELTA 3 family figures are given for reference only.- Charge either one above freezing; in winter, bring it indoors.
- For storage, keep it between 68°F and 86°F with some charge left and top up every few months (EcoFlow US).
App, UPS and smart features
The EcoFlow DELTA 3 Plus is the better UPS: 10ms, with a NAS shutdown signal, Storm Warning Alert and time-of-use settings. The EcoFlow DELTA 2 Max grows further, to 6,144Wh, and keeps AC on through outages with AC Always On.
Same EcoFlow app over Wi-Fi and Bluetooth. Both take extra batteries.Green zone: a switch under about 16ms, which most desktop PCs ride through without restarting.
Can it tell your computer to shut down? With EcoFlow PowerManager and a NUT server, the EcoFlow DELTA 3 Plus can signal a NAS to shut down; EcoFlow lists no such feature for the EcoFlow DELTA 2 Max.
Does it prepare for storms? The EcoFlow DELTA 3 Plus lists Storm Warning Alert in its app; EcoFlow lists none for the EcoFlow DELTA 2 Max.
Can it charge off-peak? The EcoFlow DELTA 3 Plus has time-of-use settings; the EcoFlow DELTA 2 Max’s app lets you prioritize solar or AC charging instead.
Does it work as a UPS? The EcoFlow DELTA 3 Plus switches in under 10ms, just over 8ms in StorageReview’s test. EcoFlow’s US page gives no time for the EcoFlow DELTA 2 Max; reviewers quote 30ms for its EPS mode, which some desktop power supplies don’t ride through.
Can you add a battery later? Both take extra batteries: the EcoFlow DELTA 2 Max reaches 6,144Wh with two, the EcoFlow DELTA 3 Plus about 5kWh.
How does the app connect? Both use the EcoFlow app over Wi-Fi or Bluetooth, so you can check them from another room or away from home.
Warranty and support
Same coverage: EcoFlow’s US warranty table lists 5 years for both the EcoFlow DELTA 2 Max and the EcoFlow DELTA 3 Plus, with no registration condition.
Same 5 years. The DELTA 3 Plus is rated for 1,000 more cycles.Subject to each brand’s warranty terms and eligibility.
EcoFlow rates the DELTA 2 Max at 3,000 cycles to 80% capacity and the DELTA 3 Plus at 4,000, about 8 and 11 years at one full cycle a day. Calendar aging and heat also reduce capacity, so read any rating as a ceiling.
- Neither needs registration for its 5 years; keep proof of purchase.
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 Plus: StorageReview (January 2025), Trusted Reviews (February 2025, UK unit), How-To Geek (January 2025), T3 (January 2025), TechRadar (February 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
- PlusReviewer A full discharge delivered 910Wh from the 1,024Wh pack, about 89 percent. StorageReview, Dylan Dougherty, January 2025
- PlusReviewer A 1,000W heater ran almost exactly one hour and drew 888Wh, about 87 percent of rated capacity. Trusted Reviews, Harry Duncton, February 2025, 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
- PlusReviewer Refilling from empty took 1,180Wh from the wall, about 87 percent charging efficiency. StorageReview, Dylan Dougherty, January 2025
- PlusReviewer A full mains charge at 1,500W took 55 minutes and used 1,109Wh, about 92 percent efficient. Flag: UK 230V charging. Trusted Reviews, Harry Duncton, February 2025, 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
- PlusReviewer Fans tended to run even at low loads, which the reviewer found distracting. Trusted Reviews, Harry Duncton, February 2025, UK unit
- PlusReviewer With a 700W vacuum running, the station fan was still audible over the vacuum. How-To Geek, Mark LoProto, January 2025
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
- PlusReviewer Measured UPS transfer time was just over 8ms with a workstation load, inside EcoFlow’s 10ms claim. StorageReview, Dylan Dougherty, January 2025
- PlusReviewer In simulated outages the router, modem, computer and monitor stayed on without any blips. TechRadar, Collin Probst, February 2025
Daily use and issues
- PlusReviewer The app showed the unit charging at about 1.45kW against its 1500W rating. StorageReview, Dylan Dougherty, January 2025
- PlusReviewer Only three of the AC outlets are three-pronged, listed as the main drawback. TechRadar, Collin Probst, February 2025
Practical limits before you buy
- The DELTA 3 Plus stops at 1,800W. A microwave and a coffee maker together overload it.
- The DELTA 2 Max’s EPS is 30ms. Fine for appliances, borderline for desktop PCs.
- 50 lb vs 27.6 lb. The DELTA 2 Max is a two-hand lift.
- X-Boost is for heating loads only. Motors need 2,400W / 4,800W surge on the DELTA 2 Max, 1,800W / 3,600W on the DELTA 3 Plus.
- Extra batteries differ. DELTA 2 Max batteries are 2,048Wh; DELTA 3 Extra Batteries are 1,024Wh.
- Both ship without solar cables.
- 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 series: 4000).
- DELTA 3 Plus, per its US documentation: AC and Smart Generator charging capped at 1500W; solar 2 x 500W (11-60V).
Frequently asked questions
Is the DELTA 3 Plus newer than the DELTA 2 Max?
Yes. The DELTA 3 Plus is the newer generation with a 10ms UPS and 4,000 cycles, but it holds half the battery and delivers 1,800W instead of 2,400W.
Which is cheaper for 2kWh?
The DELTA 2 Max, compared with a DELTA 3 Plus plus a DELTA 3 Extra Battery; see the live prices in the price section.
How long will each run a refrigerator?
At a 60W average: about 29 hours on the DELTA 2 Max and 14.5 hours on the DELTA 3 Plus.
Can both be expanded?
Yes. The DELTA 2 Max takes up to two 2,048Wh batteries for 6,144Wh; the DELTA 3 Plus takes extra batteries up to about 5kWh.
Which is better as a UPS?
The DELTA 3 Plus: 10ms against 30ms for the DELTA 2 Max’s EPS.
Do they charge at the same speed from solar?
Same 1,000W input; the DELTA 3 Plus fills in about half the time because its battery is half the size.
How much do they weigh?
50 lb for the DELTA 2 Max and 27.6 lb for the DELTA 3 Plus.
Can either run a microwave?
Yes, a typical microwave alone. With a second big appliance, only the DELTA 2 Max’s 2,400W 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 Plus: A full discharge delivered 910Wh from the 1,024Wh pack, about 89 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 Plus?
EcoFlow rates the DELTA 2 Max at no published rating and the DELTA 3 Plus at under 30dB at 600W and under 40dB at 1,200W. 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 Plus: 5 years. Where the extension depends on registration, do it in the EcoFlow app as soon as the unit arrives.
Can the DELTA 3 Plus use DELTA 2 Max batteries?
Yes. EcoFlow lists DELTA 3, DELTA 2, DELTA 2 Max and DELTA Pro 3 extra batteries as compatible with the DELTA 3 Plus, so a DELTA 2 Max battery can move over later.
Which has the better UPS?
The DELTA 3 Plus: under 10ms per EcoFlow, just over 8ms in StorageReview’s test. EcoFlow’s US page gives no switchover time for the DELTA 2 Max; reviewers quote 30ms for its EPS mode.
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; 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 Plus, read on October 30, 2026.
- 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 Plus: StorageReview, Dylan Dougherty, January 2025, Trusted Reviews, Harry Duncton, February 2025, UK unit, How-To Geek, Mark LoProto, January 2025, T3, Matt Kollat, January 2025, TechRadar, Collin Probst, February 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).
Same outlets and solar. The DELTA 2 Max doubles the battery for $310 more; the DELTA 3 Plus is 22 lb lighter with a 10ms UPS.
Prices checked November 13, 2026 at 6:29 AM EST
Looking at other models? Browse all power station comparisons, or pick any two models on the hub and we point you to the right duel.
Originally published: November 7, 2026