DELTA 3 Max Plus
- you’ll add batteries: up to about 10kWh
- you use 12V gear on the Anderson port
- you want 80% in 64 min and 1,000W of solar
DELTA 3 Ultra
- your RV takes a TT-30 plug
- you run 3,600W, 7,200W surge
- 3,072Wh is all you’ll ever need
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.
The Ultra has the bigger tank today. The Max Plus is the one that can still grow tomorrow.
The EcoFlow DELTA 3 Max Plus stores 2,048Wh and delivers 3,000W from four 20A outlets at 48.7 lb, adds a 30A Anderson port, 1,000W of solar and 2,600W generator charging, and takes extra batteries up to about 10kWh. The EcoFlow DELTA 3 Ultra stores 3,072Wh and delivers 3,600W with a 7,200W surge and a TT-30 RV outlet, at 72.1 lb, but EcoFlow lists no expansion for it, and it takes 800W of solar. Prices sit $150 apart today. If 3kWh is your ceiling and your RV has a 30A cord, the Ultra; if you’ll add batteries, run 12V gear or lean on solar, the Max Plus.
Below: the differences with numbers, a 20-second calculator for your own gear, eight modeled situations, what it costs to pass 3kWh with each, a third option that combines both, and what published tests found.
The Ultra stores 1,024Wh more, delivers 600W more and adds a TT-30. The Max Plus takes extra batteries, adds an Anderson port and Smart Output Priority, takes 200W more solar and 1,000W more generator input, and weighs 23.4 lb less. Prices sit $150 apart today.
- you’ll grow to 10kWh
- you charge from 1,000W of solar
- you’ll carry it: 48.7 lb
- your RV uses a TT-30
- you run 3,600W
- 3kWh in one box is enough
The five differences that decide it
Both use LFP cells, four 20A household outlets, a 140W USB-C plus two 45W, a 12V car socket, a 10ms UPS, Storm Guard, a 25dB rating at 600W, 1,800W wall charging and a 3-year warranty that becomes 5 after app registration.
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 Max Plus and 2,611Wh on the Ultra; StorageReview measured 1.64kWh out of a Max Plus.
Appliance for appliance, the Ultra lasts 50% longer than the Max 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 3 Ultra costs $150 more than the EcoFlow DELTA 3 Max Plus and adds 1,024Wh: that is $0.15 per extra Wh, against $0.56 per Wh for the Max Plus.
Prices refresh daily from EcoFlow US.What the $150 buys: half again the battery (3,072Wh vs 2,048Wh), 3,600W instead of 3,000W and a TT-30, but no expansion.
A Max Plus with one extra battery holds more than an Ultra, but stays at 3,000W with no TT-30; two extra batteries on a Max Plus need EcoFlow’s Expansion Adapter. The Ultra has no extra battery port at all: to grow past 3,072Wh you’d need the Ultra Plus. 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
Both answers in one box: the Ultra’s 3,072Wh, 3,600W and TT-30, with the Max Plus’s Anderson port and Smart Output Priority, 1,600W of solar, 3,200W generator charging and expansion to about 11kWh with DELTA Pro 3 Extra Batteries, at 74.3 lb. Our DELTA 3 Ultra review covers the family. See the DELTA 3 Ultra Plus at EcoFlow.
Eight modeled situations, worked out
Same formula as the calculator above: 85% of the rated capacity, no extra battery unless stated. The fridge averages 60W, about 525kWh a year.
24-hour outage, essentials only
The Ultra covers a full day; the Max Plus most of one, or about 38 hours with one extra battery.
Microwave, coffee maker and space heater
Only the Ultra carries all three, with no headroom. On the Max Plus, drop one of them.
RV with a 30A inlet
The Ultra takes the cord directly. The Max Plus needs an adapter to a 20A outlet, so you’d run fewer loads at once.
A full-size fridge, nothing else
The Ultra keeps food cold about 14.5 hours longer; one extra battery puts the Max Plus ahead, at about 58 hours.
Refill from solar, each at its maximum
The Max Plus refills in about half the time: more solar input for a smaller battery. On a short winter day, the Ultra may not fill at all.
Refill from the wall before a storm
Same 1,800W input, smaller battery: the Max Plus reaches 80% 25 minutes sooner.
A 12V fridge on an Anderson plug
The Max Plus has a 30A Anderson port sharing 378W with its car socket. The Ultra has only the 126W car socket.
Moving it
The Max Plus is a two-hand lift for one person. Plan for help or a cart with the Ultra.
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 Max Plus and DELTA 3 Ultra weight, dimensions and full specifications
Weight: 48.7 lb for the DELTA 3 Max Plus and 72.1 lb for the DELTA 3 Ultra. Dimensions: 19.4 × 9.5 × 12.0 in and 24.6 × 12.9 × 15.5 in. Everything else is in the sheet below.
EcoFlow DELTA 3 Max Plus and EcoFlow DELTA 3 Ultra full specifications
Every published figure for both units, grouped. Green marks the better value.
What’s in the box
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 3 Ultra
- DELTA 3 Ultra3,072Wh, 72.1 lb
- AC charging cable
- Manuals and warranty card
- No solar or car cablesold separately
From the EcoFlow US product pages; bundles add the matching cables.
07 · ChargingHow fast each one refills
Shorter bar, faster refill. Each row is scaled to its slower unit.
Max Plus: StorageReview measured 2.33kWh drawn from the wall for a full refillUltra: no independent charging measurement found as of October 31, 2026
Our solar times assume panels deliver 70% of their rating; the brands’ figures assume ideal sun.
Every port, side by side
DELTA 3 Max Plus
DELTA 3 Ultra
Practical consequence: the Ultra adds the TT-30 for an RV. The Max Plus adds a 30A Anderson port for 12V gear, a second solar port and an XT150 port for extra batteries, the Alternator Charger and the Smart Generator.
09 · NoiseNoise and heat: Max Plus vs Ultra
EcoFlow rates the EcoFlow DELTA 3 Max Plus and the EcoFlow DELTA 3 Ultra at 25dB or less at 600W. The Technology Man found the Max Plus barely above room noise while charging at full power; we found no usable review of the Ultra.
EcoFlow’s figures, measured at 1 m. Reviewers gave no dB values.Every figure we found, with its source
What reviewers heard: Barely registered above room noise at 1 m while charging at full power, with exhaust just over 40°C (The Technology Man, UK unit); silent during a brief spike over 3kW (T3).
Measured by a tester Brand figure
- The fans run hardest while fast charging, so lower the charging speed in the app at night.
Cold and heat: Max Plus vs Ultra
The EcoFlow DELTA 3 Max Plus and the EcoFlow DELTA 3 Ultra share the same limits: charging from 32°F to 113°F, running from 14°F to 113°F. Both are indoor units with no water rating.
Figures from the EcoFlow US product pages for both models.- Charge either one indoors in winter: neither charges below 32°F.
App, UPS and smart features
The EcoFlow DELTA 3 Max Plus does more: extra batteries, Smart Output Priority and a bigger Smart Generator link, up to 2,600W. The EcoFlow DELTA 3 Ultra matches it on the app, Storm Guard and the 10ms UPS.
Same app and UPS. The gap is expansion and output priority.Green zone: a switch under about 16ms, which most desktop PCs ride through without restarting.
Can you add a battery later? The EcoFlow DELTA 3 Max Plus takes up to two Max Plus extra batteries, toward about 10kWh. EcoFlow lists no expansion for the EcoFlow DELTA 3 Ultra.
Can it keep only the essentials running? The EcoFlow DELTA 3 Max Plus switches off non-priority outlets as the battery drains. EcoFlow’s US comparison table marks Smart Output Priority as missing on the EcoFlow DELTA 3 Ultra.
Does it work as a UPS? Both switch in under 10ms; StorageReview measured 8ms on the EcoFlow DELTA 3 Max Plus.
How much can a generator put in? The EcoFlow DELTA 3 Max Plus charges from an EcoFlow Smart Generator at up to 2,600W, the EcoFlow DELTA 3 Ultra at up to 1,600W.
Does it prepare for storms? Both charge ahead of severe weather once Storm Guard is turned on in the EcoFlow app.
How does the app connect? Both use the EcoFlow app over Wi-Fi and Bluetooth, with the OASIS 3.0 dashboard.
Warranty and support
EcoFlow gives the EcoFlow DELTA 3 Max Plus and the EcoFlow DELTA 3 Ultra the same deal: 3 years, plus 2 more once registered in the EcoFlow app.
Same 5 years at best on both, if you register on day one.Subject to each brand’s warranty terms and eligibility.
EcoFlow publishes no cycle count for either on its US pages; it quotes about 10 years of use for both. Calendar aging and heat also reduce capacity.
- Register whichever you choose in the EcoFlow app the day it arrives: without registration, the warranty stops at 3 years.
What reviewers report
We have not lab-tested these two units. Here is what 5 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 Max Plus: StorageReview (September 2025), The Technology Man (January 2026, UK unit), Trusted Reviews (January 2026, UK unit), T3 (January 2026), AndroidGuys (November 2025)DELTA 3 Ultra: no verifiable independent test found
Usable capacity
- 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
- Max PlusReviewer Reports about 1,740Wh via AC (85 percent) and 1,830Wh via DC (89 percent). AndroidGuys, Scott Webster, November 2025
Charging
- 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
- 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
- Max PlusReviewer Notes user reports that some desktop PCs and NAS devices still reboot on switchover, despite the sub-10ms claim. AndroidGuys, Scott Webster, November 2025
Practical limits before you buy
- The Ultra can’t be expanded. EcoFlow’s own comparison table lists its max scalability as 0; for more than 3,072Wh, look at the Ultra Plus.
- The Max Plus has no TT-30. A 30A RV cord needs an adapter to a 20A outlet.
- The Ultra has no Anderson port and no Smart Output Priority; its only 12V output is a 126W car socket.
- The Ultra takes 800W of solar, less than the smaller Max Plus.
- Wall charging is capped at 1,800W on both.
- On the Max Plus, two extra batteries need EcoFlow’s Expansion Adapter.
- X-Boost is for heating loads only. Motors need the continuous rating: 3,000W or 3,600W.
- Neither delivers 240V.
Frequently asked questions
What is the difference between the EcoFlow DELTA 3 Max Plus and the DELTA 3 Ultra?
The Ultra stores 3,072Wh against 2,048Wh, delivers 3,600W against 3,000W and adds a TT-30. The Max Plus takes extra batteries to about 10kWh, adds an Anderson port and Smart Output Priority, takes 1,000W of solar against 800W and weighs 48.7 lb against 72.1 lb.
Can the DELTA 3 Ultra be expanded?
No. EcoFlow lists its max scalability as 0. The DELTA 3 Ultra Plus is the expandable version, to about 11kWh.
Which is better for an RV?
The Ultra, thanks to its TT-30 and 3,600W. The Max Plus needs an adapter for a 30A cord, but its Anderson port suits 12V camper gear.
Which charges faster?
The Max Plus: 0 to 80% in 64 minutes from the wall against 89 minutes, with more solar and generator input too.
How long will each run a refrigerator?
At a 60W average: about 29 hours on the Max Plus and 43.5 hours on the Ultra. One extra battery takes the Max Plus to about 58 hours.
How much do they weigh?
48.7 lb for the DELTA 3 Max Plus and 72.1 lb for the DELTA 3 Ultra.
Do either deliver 240V?
No. Both are 120V stations.
Is there a third option?
The DELTA 3 Ultra Plus: the Ultra’s 3,072Wh, 3,600W and TT-30, plus an Anderson port, 1,600W of solar, 3,200W generator charging and expansion to about 11kWh, at 74.3 lb.
Related comparisons and reviews
How we compared and sources
Research-based comparison. We have not physically tested these two units. Specs come from the EcoFlow US product pages, the Ultra’s comparison table, the DELTA 3 Max Plus user manual and the EcoFlow US warranty table; usage observations are attributed to named reviewers. Prices and availability were checked on October 31, 2026.
- Specs: EcoFlow US, DELTA 3 Max Plus and its user manual (EF-DL3-MP), and EcoFlow US, DELTA 3 Ultra, read on October 31, 2026; warranty terms from the EcoFlow US warranty policy. The DELTA 3 Ultra: no independent measured test found from a source we could use as of October 31, 2026; EcoFlow’s figures only.
- Reviewer reports 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 Ultra adds 1,024Wh, 600W and a TT-30; the Max Plus expands to 10kWh, takes more solar and is 23.4 lb lighter. Prices sit $150 apart.
Prices checked November 13, 2026 at 6:29 AM EST
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Originally published: November 7, 2026