DELTA 3 Max
- 2kWh and 2,400W cover your outage
- you’ll move it: 44.8 lb
- you charge from the wall, not big solar
DELTA 3 Ultra Plus
- your RV takes a TT-30 plug
- you’ll use 1,600W of solar
- you’ll grow to about 11kWh
Prices and stock checked by our price engine on November 13, 2026 at 6:59 AM EST. Each product is rechecked several times a day; the time refreshes when you load the page.
The Max is a 2kWh box you buy once. The Ultra Plus is a 3kWh base you keep building on.
The EcoFlow DELTA 3 Max stores 2,048Wh and delivers 2,400W from four 20A outlets at 44.8 lb, with a 10ms UPS, 500W of solar and a 68-minute refill to 80%, but no way to add a battery. The EcoFlow DELTA 3 Ultra Plus stores 3,072Wh and delivers 3,600W with a 7,200W surge, adds a TT-30 RV outlet, a 30A Anderson port, 1,600W of solar and 3,200W generator charging, and grows to about 11kWh, at 74.3 lb. Prices sit $720 apart today. If 2kWh and 2,400W cover your outage and you’ll never add solar, the Max; for an RV, a big array or a system that grows, the Ultra Plus.
Below: the differences with numbers, a 20-second calculator for your own gear, eight modeled situations, the cost of growing the Ultra Plus, a middle option, and what published tests found on each.
The Ultra Plus stores 1,024Wh more, delivers 1,200W more, adds a TT-30 and an Anderson port, takes three times the solar and takes extra batteries. The DELTA 3 Max weighs 29.5 lb less and reaches 80% from the wall 21 minutes sooner. Prices sit $720 apart today.
- 2kWh is enough
- you’ll move it: 44.8 lb
- you charge from the wall
- your RV uses a TT-30
- you’ll use 1,600W of solar
- you’ll add batteries later
The five differences that decide it
Both use LFP cells, four 20A household outlets, a 12V car socket, an 18W USB-A, 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 DELTA 3 Max and 2,611Wh on the Ultra Plus; StorageReview measured 2.61kWh out of an Ultra Plus.
Appliance for appliance, the Ultra Plus lasts 50% longer than the Max.
Same appliance, same watts: the gap is always the size of the battery.Get our Black Friday alerts for EcoFlow
We track live prices on 40+ models from Jackery, EcoFlow, BLUETTI and Anker SOLIX. When a deal beats the lowest price we've recorded, you'll hear from us. During Black Friday week, one short recap a day at most.
Unsubscribe in one click. We may earn a commission when you buy through our links, at no extra cost to you. Privacy Policy
The price gap, in numbers
The EcoFlow DELTA 3 Ultra Plus costs $720 more than the EcoFlow DELTA 3 Max and adds 1,024Wh: that is $0.70 per extra Wh, against $0.43 per Wh for the Max.
Prices refresh daily from EcoFlow US.What the $720 buys: half again the battery (3,072Wh vs 2,048Wh), 3,600W instead of 2,400W, a TT-30 and room for extra batteries.
The DELTA 3 Max has no extra battery port: what you buy is what you keep. The Ultra Plus takes up to two DELTA Pro 3 Extra Batteries, about 11kWh in all. If you like the Max’s size but want the option to grow, the DELTA 3 Max Plus is the expandable 2kWh version. 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
The Max’s size with room to grow: 2,048Wh and 3,000W from four 20A outlets, a 30A Anderson port, 1,000W of solar, 0 to 80% from the wall in 64 minutes and expansion to about 10kWh, at 48.7 lb. It has no TT-30, like the Max. 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 Ultra Plus covers a full day; the DELTA 3 Max most of one.
Microwave and space heater at once
Only the Ultra Plus runs both. On the Max, one at a time: X-Boost to 3,400W helps the heater, not the microwave.
RV with a 30A inlet
The Ultra Plus takes the cord directly. The Max needs an adapter to a 20A outlet and stops at 2,400W.
A full-size fridge, nothing else
The Ultra Plus keeps food cold about 14.5 hours longer. Digital Trends ran a garage freezer for nearly three days on one.
Refill from solar, each at its maximum
The Ultra Plus refills in under half the time with a bigger battery. On the Max, 500W of panels takes most of a sunny day; EcoFlow quotes 3.43 hours to 80%.
Refill from the wall before a storm
Same 1,800W input, smaller battery: the Max reaches 80% 21 minutes sooner. How-To Geek’s Ultra Plus charged at 200W until changed in the app.
A 12V fridge or pump in a camper
The Ultra Plus has a 30A Anderson port sharing 378W with its car socket. The Max has only the 126W car socket.
Moving it
The Max is a two-hand lift for one person; Root-Nation still found it hard to move. Plan for help or a cart with the Ultra Plus.
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 and DELTA 3 Ultra Plus weight, dimensions and full specifications
Weight: 44.8 lb for the DELTA 3 Max and 74.3 lb for the DELTA 3 Ultra Plus. Dimensions: 19.4 × 9.4 × 12.0 in and 24.1 × 12.9 × 15.5 in. Everything else is in the sheet below.
EcoFlow DELTA 3 Max and EcoFlow DELTA 3 Ultra Plus full specifications
Every published figure for both units, grouped. Green marks the better value.
What’s in the box
DELTA 3 Max
- DELTA 3 Max power station2,048Wh, 44.8 lb
- AC charging cable
- Manuals and warranty card
- Solar cable sold separatelyEcoFlow Solar to XT60i cable
- No car charging cablesold separately, per the manual
DELTA 3 Ultra Plus
- DELTA 3 Ultra Plus3,072Wh, 74.3 lb
- AC charging cable
- Manuals and warranty card
- No solar or car cablesold separately
- Extra battery and adapter sold separately
From the EcoFlow US product pages and manuals; bundles add the matching cables.
07 · ChargingHow fast each one refills
Shorter bar, faster refill. Each row is scaled to its slower unit.
DELTA 3 Max: no independent charging measurement found as of October 31, 2026Ultra Plus: StorageReview measured 3.54kWh 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 3 Max
DELTA 3 Ultra Plus
Practical consequence: the Ultra Plus adds the TT-30 for an RV, a 30A Anderson port, a 140W USB-C and an extra battery port. The Max has a single XT60i input shared between solar and car charging, and no XT150 port, so EcoFlow’s reverse charging and battery preservation modes aren’t available on it.
09 · NoiseNoise: Max vs Ultra Plus
EcoFlow rates the EcoFlow DELTA 3 Max and the EcoFlow DELTA 3 Ultra Plus at 25dB or less at 600W. Digital Trends found the Ultra Plus fans unnoticeable even at full load; Root-Nation found the Max relatively quiet, louder as the load rises.
EcoFlow’s figures, measured at 1 m. Reviewers gave no dB values.Every figure we found, with its source
What reviewers heard: Relatively quiet like other third-generation EcoFlow units, though fan noise rises with load (Root-Nation, EU unit).
What reviewers heard: Fan noise stayed unnoticeable even under full load (Digital Trends).
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 vs Ultra Plus
The EcoFlow DELTA 3 Max and the EcoFlow DELTA 3 Ultra Plus 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 Ultra Plus does more: extra batteries, Smart Output Priority and a 3,200W Smart Generator link. The EcoFlow DELTA 3 Max matches it on the app, Storm Guard and the 10ms UPS.
Same app and UPS. The gap is expansion, generator power 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 Ultra Plus takes up to two DELTA Pro 3 Extra Batteries, about 11kWh in all; the EcoFlow DELTA 3 Max has no extra battery port.
Can it keep only the essentials running? The EcoFlow DELTA 3 Ultra Plus switches off non-priority outlets at a battery level you choose. EcoFlow lists no such feature for the EcoFlow DELTA 3 Max.
Does it work as a UPS? Both switch in under 10ms; StorageReview measured 8.25ms on the EcoFlow DELTA 3 Ultra Plus.
How much can a generator put in? The EcoFlow DELTA 3 Ultra Plus charges from an EcoFlow Smart Generator at up to 3,200W; the EcoFlow DELTA 3 Max takes a generator through its 1,800W AC input.
Does it prepare for storms? Both charge ahead of severe weather once Storm Guard is turned on in the EcoFlow app.
Can it charge off-peak? Both charge off-peak with timed tasks in the EcoFlow app; on the EcoFlow DELTA 3 Ultra Plus this needs app V6.15+ and firmware V7.80.99.52+.
How does the app connect? Both use the EcoFlow app over Wi-Fi and Bluetooth.
Warranty and support
EcoFlow gives the EcoFlow DELTA 3 Max and the EcoFlow DELTA 3 Ultra Plus 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 4 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: Root-Nation (March 2026, EU unit)DELTA 3 Ultra Plus: StorageReview (September 2025), Digital Trends (July 2026), How-To Geek (October 2025)
Usable capacity
- Ultra PlusReviewer A full discharge delivered 2.61kWh from the 3,072Wh pack, about 85 percent. StorageReview, Dylan Dougherty, September 2025
Charging
- Ultra PlusReviewer Refilling from empty took 3.54kWh from the wall, about 87 percent charging efficiency. StorageReview, Dylan Dougherty, September 2025
- Ultra PlusReviewer Wall charging at 1,800W reached 100 percent in roughly an hour and forty minutes. Digital Trends, Ian Bell, July 2026
- Ultra PlusReviewer Out of the box it charged at 200W; at the full 1,800W setting a full charge took about 1 hour 40 minutes, slower than the claimed 89 minutes. How-To Geek, Cory Gunther, October 2025
Noise and heat
- MaxReviewer Relatively quiet like other third-generation EcoFlow units, though fan noise rises with load. Root-Nation, Denis Zaychenko, March 2026, EU unit
- Ultra PlusReviewer Fan noise stayed unnoticeable even under full load. Digital Trends, Ian Bell, July 2026
UPS and output
- Ultra PlusReviewer Measured UPS transfer time was 8.25ms on a workstation load. StorageReview, Dylan Dougherty, September 2025
- Ultra PlusReviewer A full workstation with desktop, monitor, tablet and router ran for over 10 hours with capacity left. Digital Trends, Ian Bell, July 2026
- Ultra PlusReviewer A garage freezer ran for nearly three full days on one charge. Digital Trends, Ian Bell, July 2026
Daily use and issues
- MaxReviewer The app cannot automatically switch AC output back on, which matters for unattended backup. Root-Nation, Denis Zaychenko, March 2026, EU unit
- MaxReviewer At just over 20kg and mid-tower PC size, the reviewer found it hard to move. Root-Nation, Denis Zaychenko, March 2026, EU unit
- Ultra PlusReviewer The display struggles in direct sunlight. Digital Trends, Ian Bell, July 2026
- Ultra PlusReviewer Switching to full 1,800W charging tripped the reviewer’s garage GFCI outlet. How-To Geek, Cory Gunther, October 2025
- Ultra PlusReviewer Big and heavy at over 75 lbs, with a display hard to read in sunlight. How-To Geek, Cory Gunther, October 2025
Practical limits before you buy
- The DELTA 3 Max can’t be expanded. It has no extra battery port; the DELTA 3 Max Plus is the expandable version.
- The DELTA 3 Max takes 500W of solar on one port shared with car charging.
- The Max has no TT-30 and no Anderson port. A 30A RV cord needs an adapter.
- The Ultra Plus weighs 74.3 lb. How-To Geek called it big and heavy; plan where it lives.
- Check the Ultra Plus’s charging setting. How-To Geek’s unit charged at 200W out of the box, and the full 1,800W setting tripped a garage GFCI outlet.
- The Max’s app can’t switch AC output back on by itself, per Root-Nation, which matters for unattended backup.
- X-Boost is for heating loads only. Motors need the continuous rating: 2,400W or 3,600W.
- Neither delivers 240V.
Frequently asked questions
What is the difference between the EcoFlow DELTA 3 Max and the DELTA 3 Ultra Plus?
The Ultra Plus stores 3,072Wh against 2,048Wh, delivers 3,600W against 2,400W, adds a TT-30 and an Anderson port, takes 1,600W of solar against 500W and expands to about 11kWh. The Max weighs 44.8 lb against 74.3 lb.
Can the DELTA 3 Max be expanded?
No. It has no extra battery port. The DELTA 3 Max Plus is the expandable 2kWh model.
Which is better for an RV?
The Ultra Plus, thanks to its TT-30, Anderson port and 3,600W. The Max needs an adapter for a 30A cord.
Which charges faster from the wall?
The DELTA 3 Max: 0 to 80% in 68 minutes, against 89 minutes for the Ultra Plus. Both draw 1,800W.
How long will each run a refrigerator?
At a 60W average: about 29 hours on the DELTA 3 Max and 43.5 hours on the Ultra Plus.
Can the DELTA 3 Max run a microwave?
Yes, a 1,100W microwave runs on its 2,400W inverter, for about an hour and a half on a full battery.
Do either deliver 240V?
No. Both are 120V stations.
Is there a middle option?
The DELTA 3 Max Plus: the Max’s 2,048Wh in a 48.7 lb box, with 3,000W, an Anderson port, 1,000W of solar and expansion to about 10kWh.
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 DELTA 3 Max 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 and its user manual (EF-DL-H02-3M), and EcoFlow US, DELTA 3 Ultra Plus, read on October 31, 2026; warranty terms from the EcoFlow US warranty policy. DELTA 3 Max: no independent measured test found as of October 31, 2026; EcoFlow’s figures plus one EU review.
- Reviewer reports on the DELTA 3 Max: Root-Nation, Denis Zaychenko, March 2026, EU unit; on the DELTA 3 Ultra Plus: StorageReview, Dylan Dougherty, September 2025, Digital Trends, Ian Bell, July 2026, How-To Geek, Cory Gunther, October 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 Plus adds 1,024Wh, 1,200W, a TT-30, triple the solar and expansion; the DELTA 3 Max is 29.5 lb lighter. Prices sit $720 apart.
Prices checked November 13, 2026 at 6:59 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