DELTA 3 Ultra
- you’re planning for a home outage
- you run a fridge, a microwave or a furnace
- you want 3,072Wh and a TT-30
RIVER 3 Plus
- you’ll carry it: 10.4 lb
- your loads stay under 600W
- you want a UPS for a router or PC
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.
This isn’t a choice between two sizes. It’s a choice between a lunchbox and a fridge-sized battery.
The EcoFlow RIVER 3 Plus stores 286Wh and delivers 600W from three outlets at 10.4 lb, with a 10ms UPS for a router or a PC, 220W of solar and a clip-on battery that takes it to 858Wh. The EcoFlow DELTA 3 Ultra stores 3,072Wh and delivers 3,600W from four 20A outlets and a TT-30, enough for a fridge, a furnace blower and a microwave through a day-long outage, but it weighs 72.1 lb and can’t be expanded. EcoFlow US hasn’t listed the RIVER 3 Plus since November 4, 2026; the closest small model it sells today is the RIVER 2 Max 500, with 499Wh and 500W at 13.2 lb. If you already own a RIVER 3 Plus, it covers a desk, a campsite or a few hours of Wi-Fi; for an outage at home, only the DELTA 3 Ultra is in the running.
Below: the differences with numbers, a 20-second calculator for your own gear, eight modeled situations, the 1kWh middle option, and what published tests found.
Different classes. The DELTA 3 Ultra holds ten times the energy and six times the output, enough for home appliances; the RIVER 3 Plus is a 10.4 lb box for electronics, a CPAP for a night or a campsite. EcoFlow US hasn’t listed the RIVER 3 Plus since November 4, 2026; the RIVER 2 Max 500 is the closest small model it sells.
- it’s for home outages
- you run 3,600W loads
- you plug in a 30A RV cord
- you carry it: 10.4 lb
- laptops, phones, a router
- a night at a campsite
The five differences that decide it
Both use LFP cells, the EcoFlow app over Wi-Fi and Bluetooth, X-Boost for heating loads and a UPS function rated under 10ms. 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 2,611Wh usable on the DELTA 3 Ultra and 243Wh on the RIVER 3 Plus; CyberShack got 228Wh out of a RIVER 3 Plus at a 108W load (Australian unit). No independent measurement of the DELTA 3 Ultra was found.
Appliance for appliance, the Ultra lasts 10.7 times as long as the RIVER 3 Plus.
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What to buy instead today
The RIVER 2 Max 500 is the closest small box EcoFlow US sells today: 499Wh, 500W (1,000W X-Boost), 220W of solar and a 60-minute wall refill, at 13.2 lb. It lists no UPS switchover time. The DELTA 3 Ultra is a different class: 3,072Wh and 3,600W. EcoFlow US prices move often; the figures here are refreshed daily by our price engine.
The third option: the DELTA 3 Plus at $719
EcoFlow DELTA 3 Plus: $719 today
The middle ground if 286Wh is too little and 72.1 lb too much: 1,024Wh and 1,800W from six outlets at 27.6 lb, a 10ms UPS, full from the wall in 56 minutes, 1,000W of solar and extra batteries up to about 5kWh. It runs a fridge for about 14 hours and a microwave, and still fits in a car trunk. Our DELTA 3 Plus review goes deeper. See the DELTA 3 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 DELTA 3 Ultra covers a full day; the RIVER 3 Plus runs that load for under three hours.
A full-size fridge, nothing else
Close to two days on the DELTA 3 Ultra, about four hours on the RIVER 3 Plus.
CPAP, one night
About eight nights on the DELTA 3 Ultra. The RIVER 3 Plus covers about six hours, short of a full night; with an EB600 it reaches about two nights.
A desk UPS for a router and a PC
Both switch in under 10ms; StorageReview measured 9ms on the RIVER 3 Plus. It bridges a short outage at a desk; the DELTA 3 Ultra keeps that setup up for most of a day.
A kettle or a microwave
Only the DELTA 3 Ultra. X-Boost lets the RIVER 3 Plus run some heating loads up to 1,200W at reduced power, not a microwave.
Refill from solar, each at its maximum
The RIVER 3 Plus fills in under two hours of good sun; the DELTA 3 Ultra needs more than a full day at its 800W cap.
Refill from the wall before a storm
The RIVER 3 Plus is full in an hour; the DELTA 3 Ultra reaches 80% in 89 minutes with ten times the energy.
Carrying it
The RIVER 3 Plus goes anywhere with one hand. The DELTA 3 Ultra rolls on wheels, but at 72.1 lb it mostly stays in a garage or a utility room.
Eight 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 Ultra and RIVER 3 Plus weight, dimensions and full specifications
Weight: 72.1 lb for the DELTA 3 Ultra and 10.4 lb for the RIVER 3 Plus. Dimensions: 24.6 × 12.9 × 15.5 in and 9.2 × 9.1 × 5.8 in. Everything else is in the sheet below.
EcoFlow DELTA 3 Ultra and EcoFlow RIVER 3 Plus full specifications
Every published figure for both units, grouped. Green marks the better value.
What’s in the box
DELTA 3 Ultra
- DELTA 3 Ultra3,072Wh, 72.1 lb
- AC charging cable
- Manuals and warranty card
- No solar or car cablesold separately
RIVER 3 Plus
- RIVER 3 Plus286Wh, 10.4 lb
- AC charging cable
- Manual
- Extra battery sold separately
From the EcoFlow US product pages.
07 · ChargingHow fast each one refills
Shorter bar, faster refill. Each row is scaled to its slower unit.
DELTA 3 Ultra: EcoFlow US, 0 to 80% in 89 minutes at 1,800WRIVER 3 Plus: CyberShack refilled it in about three hours from a 120W panel delivering 110W (Australian unit)
Our solar times assume panels deliver 70% of their rating; the brands’ figures assume ideal sun.
Every port, side by side
DELTA 3 Ultra
RIVER 3 Plus
Practical consequence: the DELTA 3 Ultra adds four 20A outlets, a TT-30 for an RV and a 140W USB-C. The RIVER 3 Plus has three outlets, a 100W USB-C and a car outlet, and takes a clip-on battery the DELTA 3 Ultra can’t.
09 · NoiseNoise: Ultra vs RIVER 3 Plus
Both are rated quiet: the EcoFlow DELTA 3 Ultra at 25dB or less at 600W, the EcoFlow RIVER 3 Plus under 30dB at 1.5 ft. CyberShack measured 33dB from the RIVER 3 Plus at full load from 2 m; no reviewer measured the plain DELTA 3 Ultra.
One reviewer measurement, on an Australian RIVER 3 Plus.Every figure we found, with its source
What reviewers heard: Noticeably cooler and quieter than the RIVER 2 the reviewer used before (Australian Photography, Australian unit).
Measured by a tester Brand figure
- The fans run hardest while fast charging, so lower the charging speed in the app at night.
Cold, heat and storage: Ultra vs RIVER 3 Plus
The EcoFlow DELTA 3 Ultra and the EcoFlow RIVER 3 Plus share the same limits: charging from 32°F to 113°F, running from 14°F to 113°F. Only the RIVER 3 Plus’s battery pack carries a rating, IP54.
Figures from the EcoFlow US product pages of both models.- In a cold garage, bring either one inside to charge: neither charges below 32°F.
- For storage, keep the RIVER 3 Plus between 68°F and 86°F, EcoFlow’s recommended range.
App, UPS and smart features
Same app and the same sub-10ms UPS. The EcoFlow DELTA 3 Ultra adds Storm Guard, time-of-use and Smart Generator charging; the EcoFlow RIVER 3 Plus adds a USB-B port for EcoFlow’s Power Manager software and a clip-on battery.
Both switch in under 10ms; StorageReview measured 9ms on the RIVER 3 Plus.Green zone: a switch under about 16ms, which most desktop PCs ride through without restarting.
Can it warn a PC on low battery? The EcoFlow RIVER 3 Plus has a USB-B port for EcoFlow’s Power Manager software, which notifies you and saves your data when the battery runs low. EcoFlow lists no such port on the EcoFlow DELTA 3 Ultra.
Can you add a battery later? EcoFlow lists the EcoFlow DELTA 3 Ultra’s max scalability as 0. The EcoFlow RIVER 3 Plus takes one EB300 or EB600, up to 858Wh.
Does it prepare for storms? The EcoFlow DELTA 3 Ultra charges ahead of severe weather with Storm Guard; EcoFlow lists no such feature for the EcoFlow RIVER 3 Plus.
Can it charge from a generator? The EcoFlow DELTA 3 Ultra charges from an EcoFlow Smart Generator at up to 1,600W; EcoFlow lists no generator feature for the EcoFlow RIVER 3 Plus.
Does it work as a UPS? Both switch in under 10ms; StorageReview measured 9ms on the EcoFlow RIVER 3 Plus.
How does the app connect? Both use the EcoFlow app over Wi-Fi and Bluetooth.
Warranty and support
The EcoFlow RIVER 3 Plus gets 5 years with no registration condition listed. The EcoFlow DELTA 3 Ultra gets 3 years, plus 2 once registered in the EcoFlow app.
Both reach 5 years; only the DELTA 3 Ultra needs the app for it.Subject to each brand’s warranty terms and eligibility.
EcoFlow rates the RIVER 3 Plus at 3,000 cycles to 80%, about 8 years at one full cycle a day. For the DELTA 3 Ultra, EcoFlow US publishes no cycle count, only 10 years of reliable power.
- Register the DELTA 3 Ultra in the EcoFlow app the day it arrives: the last 2 of its 5 years depend on it.
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 Ultra: no verifiable independent test foundRIVER 3 Plus: StorageReview (February 2025), CyberShack (March 2025, Australian unit), Bob Vila (March 2025), Australian Photography (May 2025, Australian unit), The Gadgeteer (February 2025)
Usable capacity
- RIVER 3 PlusReviewer Reported 0.43kWh discharged and 0.56kWh to recharge; the discharge figure exceeds the 286Wh rating and looks doubtful. StorageReview, Dylan Dougherty, February 2025
- RIVER 3 PlusReviewer 240V output test returned 228Wh from the 286Wh battery, about 79% at a 108W load. CyberShack, Ray Shaw, March 2025, Australian unit
Charging
- RIVER 3 PlusReviewer A third-party 120W panel, effective 110W, refilled it in about three hours in perfect sun. CyberShack, Ray Shaw, March 2025, Australian unit
- RIVER 3 PlusReviewer With a small 45W solar panel, a recharge from 10% takes most of a day, close to 8 hours. Bob Vila, Mark Wolfe, March 2025
- RIVER 3 PlusReviewer Zero to 100% on mains in around an hour (Australian 240V unit). Australian Photography, Mike O’Connor, May 2025, Australian unit
Noise and heat
- RIVER 3 PlusReviewer Measured 33dB at full load from 2 metres, where the unit would usually sit. CyberShack, Ray Shaw, March 2025, Australian unit
- RIVER 3 PlusReviewer Runs noticeably cooler and quieter than the RIVER 2 the reviewer tested before, whose fans kicked on often. Australian Photography, Mike O’Connor, May 2025, Australian unit
UPS and output
- RIVER 3 PlusReviewer Lab measurement with a Quarch mains analyzer showed a 9ms transfer time, inside EcoFlow’s under-10ms claim. StorageReview, Dylan Dougherty, February 2025
- RIVER 3 PlusReviewer Reviewer uses it as a UPS for router and smart-home gear and rates the 10ms cutover imperceptible. CyberShack, Ray Shaw, March 2025, Australian unit
- RIVER 3 PlusReviewer After four months of use, brewing 6 cups on a home coffee maker took 43 to 45% of the charge. Bob Vila, Mark Wolfe, March 2025
- RIVER 3 PlusReviewer Ran a diesel heater in a cold garage for up to 4 hours with no issues. The Gadgeteer, Julian Perry, February 2025
Daily use and issues
- RIVER 3 PlusReviewer App over Bluetooth and Wi-Fi; EcoFlow recommends a 20% discharge and 80% charge limit for battery health. StorageReview, Dylan Dougherty, February 2025
- RIVER 3 PlusReviewer Would not charge at first in a freezing garage; the reviewer concluded it was below its charging temperature, then it charged normally. The Gadgeteer, Julian Perry, February 2025
Practical limits before you buy
- The RIVER 3 Plus doesn’t cover a night of CPAP on its own. About six hours at 40W; the EB600 battery fixes that.
- The RIVER 3 Plus stops at 600W. No microwave, kettle or space heater.
- The DELTA 3 Ultra takes no extra battery. EcoFlow lists its max scalability as 0.
- The DELTA 3 Ultra weighs 72.1 lb. It rolls, but it isn’t a camping box.
- X-Boost is for heating loads only. Motors need the continuous rating: 3,600W or 600W.
- Register the DELTA 3 Ultra in the app: the last 2 of its 5 years depend on it.
Frequently asked questions
What is the difference between the EcoFlow DELTA 3 Ultra and the RIVER 3 Plus?
Class. The DELTA 3 Ultra stores 3,072Wh and delivers 3,600W from four 20A outlets and a TT-30, at 72.1 lb. The RIVER 3 Plus stores 286Wh and delivers 600W from three outlets, at 10.4 lb.
Can the RIVER 3 Plus run a refrigerator?
For about four hours at a 60W average. The DELTA 3 Ultra runs the same fridge for about 43 hours.
Can the RIVER 3 Plus run a CPAP all night?
About six hours at 40W without a humidifier. With an EB600 extra battery it reaches 858Wh, about two nights.
Do both work as a UPS?
Yes, both switch in under 10ms; StorageReview measured 9ms on the RIVER 3 Plus.
Which one charges faster?
The RIVER 3 Plus is full in about an hour at 380W; the DELTA 3 Ultra reaches 80% in 89 minutes at 1,800W, with ten times the energy.
Can either take an extra battery?
The RIVER 3 Plus takes one EB300 or EB600, up to 858Wh. The DELTA 3 Ultra takes none; the DELTA 3 Ultra Plus is the expandable version.
How much do they weigh?
10.4 lb for the RIVER 3 Plus and 72.1 lb for the DELTA 3 Ultra.
Is there a middle option?
The DELTA 3 Plus: 1,024Wh and 1,800W from six outlets at 27.6 lb, with a 10ms UPS and extra batteries to about 5kWh.
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 and warranty table; usage observations are attributed to named reviewers. Prices and availability were checked on October 31, 2026.
- Specs: EcoFlow US, DELTA 3 Ultra, and EcoFlow US, RIVER 3 Plus, read on October 31, 2026; warranty terms from the EcoFlow US warranty policy.
- No independent hands-on test of the plain DELTA 3 Ultra was found; published tests cover the DELTA 3 Ultra Plus, a different model, and were not used.
- Reviewer reports on the RIVER 3 Plus: StorageReview, Dylan Dougherty, February 2025, CyberShack, Ray Shaw, March 2025, Australian unit, Bob Vila, Mark Wolfe, March 2025, Australian Photography, Mike O’Connor, May 2025, Australian unit, The Gadgeteer, Julian Perry, 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).
3,072Wh and 3,600W at 72.1 lb against 286Wh and 600W at 10.4 lb. EcoFlow US hasn’t listed the RIVER 3 Plus since Nov 4, 2026.
Prices checked November 13, 2026 at 6:29 AM EST
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Originally published: November 13, 2026