DELTA 3 Classic
- you’ll carry it: 26.6 lb
- 1kWh covers your evening
- you want a one-hour wall refill
DELTA 3 Ultra Plus
- you need a full day or more: 3,072Wh to about 11kWh
- your RV takes a TT-30 plug
- you charge from 1,600W of solar
Prices and stock checked by our price engine on November 13, 2026 at 9:29 AM EST. Each product is rechecked several times a day; the time refreshes when you load the page.
The Classic is a box for one evening. The Ultra Plus is the start of a home system.
The EcoFlow DELTA 3 Classic stores 1,024Wh and delivers 1,800W from three outlets at 26.6 lb, with a 10ms UPS and a one-hour wall refill, but no 12V output and no way to add a battery. The EcoFlow DELTA 3 Ultra Plus stores 3,072Wh and delivers 3,600W with a 7,200W surge from four 20A outlets and a TT-30 RV outlet, adds a car socket and a 30A Anderson port, takes 1,600W of solar and 3,200W from a Smart Generator, and grows to about 11kWh with two DELTA Pro 3 Extra Batteries, at 74.3 lb. Prices sit $1,120 apart today. If 1kWh covers your evening, the Classic is the whole answer; for a full day of outage, an RV, a solar setup or a battery bank you’ll grow, the Ultra Plus.
Below: the five 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.
The Ultra Plus stores three times the energy, delivers twice the output, adds a TT-30, a car socket and a 30A Anderson port, takes 1,100W more solar and grows to about 11kWh. The Classic weighs 47.7 lb less and reaches 80% from the wall in half the time. Both switch in 10ms or less. Prices sit $1,120 apart today.
- you carry it: 26.6 lb
- 1kWh is enough
- you refill in about an hour
- you’ll grow to 11kWh
- your RV uses a TT-30
- you charge from 1,600W of solar
The five differences that decide it
Both use LFP cells, the EcoFlow app over Wi-Fi and Bluetooth, Storm Guard, X-Boost for heating loads, a 10ms-class UPS and the same 3-year warranty that becomes 5 after app registration. 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 Classic and 2,611Wh on the Ultra Plus without extra batteries; StorageReview measured 2.61kWh out of an Ultra Plus.
Appliance for appliance, the Ultra Plus lasts 3.0 times as long as the Classic.
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 Plus costs $1,120 more than the EcoFlow DELTA 3 Classic and adds 2,048Wh: that is $0.55 per extra Wh, against $0.47 per Wh for the Classic.
Prices refresh daily from EcoFlow US.What the $1,120 buys: three times the battery (3,072Wh vs 1,024Wh), 3,600W instead of 1,800W, a TT-30, 12V ports and room for about 11kWh.
Three Classics match the Ultra Plus’s 3kWh in three 26.6 lb boxes, but each stays at 1,800W, none has a TT-30 or a 12V port, and none can grow. The Ultra Plus takes up to two DELTA Pro 3 Extra Batteries. 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
Expansion at two thirds of the Ultra Plus’s weight: 2,048Wh and 3,000W from four 20A outlets, a 12V car socket and a 30A Anderson port, 1,000W of solar on two ports, 2,600W of Smart Generator charging and up to two Max Plus extra batteries for about 10kWh, at 48.7 lb. It has no TT-30, and the same 3-plus-2-year warranty. StorageReview measured an 8ms switchover and 1.64kWh out of it. 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 Classic gets you through the evening and part of the night. The Ultra Plus covers the whole day, about three with one extra battery.
A full-size fridge, nothing else
About 14 hours on the Classic, close to two days on the Ultra Plus. Digital Trends ran a garage freezer for nearly three days on one charge.
Microwave and coffee maker at once
Only the Ultra Plus runs both. On the Classic, one at a time: X-Boost helps heating loads, not a microwave’s electronics.
CPAP, every night
Two to three nights on the Classic, about eight on the Ultra Plus.
An RV with 12V gear
The Ultra Plus takes the RV’s shore cord on its TT-30 and a 12V fridge on its 30A Anderson port. The Classic has household outlets only, so the RV needs an adapter, stays under 1,800W and runs 12V gear through AC.
Refill from solar, each at its maximum
About the same time, because the Ultra Plus takes three times the panels for three times the battery. EcoFlow says the Classic fills in about 2.5 hours at 500W.
Refill from the wall before a storm
The Classic reaches 80% in half the time. Digital Trends and How-To Geek both needed about 1 hour 40 minutes to fill an Ultra Plus at 1,800W.
Moving it
The Classic is a one-hand carry. The Ultra Plus is a 74.3 lb station that mostly stays put; How-To Geek called it big and heavy at over 75 lb.
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 Classic and DELTA 3 Ultra Plus weight, dimensions and full specifications
Weight: 26.6 lb for the DELTA 3 Classic and 74.3 lb for the DELTA 3 Ultra Plus. Dimensions: 15.7 × 7.9 × 11.1 in and 24.1 × 12.9 × 15.5 in. Everything else is in the sheet below.
EcoFlow DELTA 3 Classic 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 Classic
- DELTA 3 Classic power station1,024Wh, 26.6 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 the Classic’s manual; bundles add the matching cables.
07 · ChargingHow fast each one refills
Shorter bar, faster refill. Each row is scaled to its slower unit.
Classic: Basic Tutorials needed just under 55 minutes for a full charge on a 230V EU unitUltra 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 Classic
DELTA 3 Ultra Plus
Practical consequence: the Ultra Plus adds a fourth outlet, a TT-30 for an RV, a 12V car socket, a 30A Anderson port, a 140W USB-C, Smart Generator charging and a port for extra batteries. The Classic has AC and USB only.
09 · NoiseNoise and heat: Classic vs Ultra Plus
EcoFlow rates the EcoFlow DELTA 3 Classic at 30dB or less at 600W and the EcoFlow DELTA 3 Ultra Plus at 25dB or less at 600W.
EcoFlow’s figures first; reviewer reports where we found one.Every figure we found, with its source
What reviewers heard: During a high-load grill test, battery temperature in the app climbed from 35 to 53°C, with audible fans (Basic Tutorials, EU unit).
What reviewers heard: Digital Trends found the fans unnoticeable even at full load.
Measured by a tester Brand figure
- Lower the AC charging speed in the EcoFlow app overnight: the fans run hardest while fast charging.
Cold and heat: Classic vs Ultra Plus
The EcoFlow DELTA 3 Classic 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. Neither carries a water rating.
Figures from the DELTA 3 Classic manual and EcoFlow US for the DELTA 3 Ultra Plus.- Charge either one indoors in winter: neither charges below 32°F.
- Run it between 68°F and 86°F when you can: EcoFlow’s optimal operating range.
App, UPS and smart features
The EcoFlow DELTA 3 Ultra Plus does more: expansion, a Smart Generator link and Smart Output Priority.
Same EcoFlow app over Wi-Fi and Bluetooth.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 Classic has no extra battery port; the EcoFlow DELTA 3 Ultra Plus takes up to two DELTA Pro 3 Extra Batteries, to about 11kWh.
Does it work with EcoFlow’s Smart Generator? The EcoFlow DELTA 3 Classic doesn’t work with the Smart Generator 3000’s automatic start-stop, per EcoFlow; the EcoFlow DELTA 3 Ultra Plus charges from an EcoFlow Smart Generator at up to 3,200W.
Can it keep only the essentials running? The EcoFlow DELTA 3 Ultra Plus lets you choose which outlets stay powered as the battery drains; EcoFlow lists no such feature for the EcoFlow DELTA 3 Classic.
Does it work as a UPS? The EcoFlow DELTA 3 Classic switches in 10ms; the EcoFlow DELTA 3 Ultra Plus switches in under 10ms, and StorageReview measured 8.25ms.
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 for monitoring, charge limits and output control.
Warranty and support
EcoFlow gives the EcoFlow DELTA 3 Classic and the EcoFlow DELTA 3 Ultra Plus the same deal: 3 years, plus 2 more once registered in the EcoFlow app.
Same term on both.Subject to each brand’s warranty terms and eligibility.
For the DELTA 3 Classic, no cycle count on its US page; EcoFlow quotes 10 years of reliable power. For the DELTA 3 Ultra Plus, no cycle count on its US page; EcoFlow quotes 10 years of reliable power. Heat and calendar age also wear a battery, so read any rating as a ceiling.
- If you choose the EcoFlow DELTA 3 Classic, register it in the EcoFlow app the day it arrives: without registration, the warranty stops at 3 years.
- If you choose the EcoFlow DELTA 3 Ultra Plus, register it 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 Classic: Basic Tutorials (March 2026, EU unit)DELTA 3 Ultra Plus: StorageReview (September 2025), Digital Trends (July 2026), How-To Geek (October 2025)
Usable capacity
- ClassicReviewer At over 1,800W the battery ran from full to 0 percent in just over 30 minutes. Basic Tutorials, Simon Lüthje, March 2026, EU unit
- Ultra PlusReviewer A full discharge delivered 2.61kWh from the 3,072Wh pack, about 85 percent. StorageReview, Dylan Dougherty, September 2025
Charging
- ClassicReviewer A full wall charge took just under 55 minutes on the European unit (1,400W AC input). Flag: 230V charging. Basic Tutorials, Simon Lüthje, March 2026, EU unit
- 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
- ClassicReviewer Battery temperature in the app climbed from 35 to 53 degrees C during the high-load grill test, with audible fans. Basic Tutorials, Simon Lüthje, March 2026, EU unit
- Ultra PlusReviewer Fan noise stayed unnoticeable even under full load. Digital Trends, Ian Bell, July 2026
UPS and output
- ClassicReviewer It held about 1.83kW of output on an electric grill from full down to empty, with no drop in power. Basic Tutorials, Simon Lüthje, March 2026, EU unit
- 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
- ClassicReviewer There is no 12-volt car socket for DC devices like cool boxes. Basic Tutorials, Simon Lüthje, 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 Classic can’t be expanded and has no 12V socket. Basic Tutorials flagged the missing socket for cool boxes and other DC gear.
- The Classic’s surge figure differs: 3,000W in its manual, 3,600W on its product page. Plan on the lower one.
- The Ultra Plus weighs 74.3 lb. Plan where it lives before an outage.
- The Ultra Plus’s Anderson port and car socket share 378W.
- Full-speed charging tripped a GFCI outlet in How-To Geek’s garage; the Ultra Plus started at 200W out of the box.
- The Ultra Plus’s TT-30 is 120V. It runs an RV’s 30A system, not a 240V well pump.
- X-Boost is for heating loads only. Motors need the continuous rating: 1,800W or 3,600W.
- Register either one in the app for the full 5 years; without it, 3.
Frequently asked questions
What is the difference between the EcoFlow DELTA 3 Classic and the DELTA 3 Ultra Plus?
The Ultra Plus stores 3,072Wh against 1,024Wh, delivers 3,600W against 1,800W, adds a TT-30 RV outlet, a 12V car socket, a 30A Anderson port and 1,100W more solar, and takes extra batteries to about 11kWh. The Classic weighs 26.6 lb against 74.3 lb.
Can the DELTA 3 Classic be expanded?
No. It has no extra battery port. The Ultra Plus takes up to two DELTA Pro 3 Extra Batteries, for about 11kWh.
Does the DELTA 3 Classic have a 12V car outlet?
No. 12V devices run from its AC outlets through their own adapters. The Ultra Plus has a car socket and a 30A Anderson port, sharing 378W.
How long will each run a refrigerator?
At a 60W average: about 14.5 hours on the Classic and 43.5 hours on the Ultra Plus without extra batteries.
Which charges faster from the wall?
The Classic reaches 80% in 45 minutes at 1,400W; the Ultra Plus reaches 80% in 89 minutes at 1,800W, with three times the energy to put back.
Can the Classic run a microwave?
Yes, a 1,100W microwave runs on its 1,800W inverter, for about 47 minutes on a full battery. A microwave and a coffee maker together need the Ultra Plus.
Which is better as a UPS?
Both switch in 10ms or less; StorageReview measured 8.25ms on the Ultra Plus. The Ultra Plus carries up to 3,600W through the switch, the Classic 1,800W.
Do they have the same warranty?
Yes: 3 years, extended to 5 when registered in the EcoFlow app.
Is there a middle option?
The DELTA 3 Max Plus: 2,048Wh and 3,000W at 48.7 lb, with a car socket, a 30A Anderson port, 1,000W of solar and extra batteries up to about 10kWh, but no TT-30.
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 Classic 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 Classic and its user manual (EF-DL3-C), and EcoFlow US, DELTA 3 Ultra Plus, read on October 31, 2026; warranty terms from the EcoFlow US warranty policy.
- Reviewer reports on the DELTA 3 Classic: Basic Tutorials, Simon Lüthje, 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 triples the battery, doubles the output, adds a TT-30 and 12V ports and grows to 11kWh; the Classic is 47.7 lb lighter. Prices sit $1,120 apart.
Prices checked November 13, 2026 at 9:29 AM EST
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Originally published: November 13, 2026