DELTA 3 Classic
- you run a microwave or a kettle: 1,800W
- a fridge through the night
- you want 1kWh in one box
RIVER 3 Plus
- you carry it everywhere: 10.4 lb
- you back up a router or a laptop
- you use a 12V socket
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 RIVER keeps the router alive. The Classic keeps the kitchen going.
The EcoFlow DELTA 3 Classic stores 1,024Wh and delivers 1,800W from three outlets at 26.6 lb, enough for a microwave, a kettle or a fridge through the night. The EcoFlow RIVER 3 Plus stores 286Wh and delivers 600W at 10.4 lb, adds a 12V car socket and takes one extra battery up to 858Wh. Both switch to battery in 10ms and refill from the wall in about an hour. 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’s enough for a router, a CPAP for one night or a laptop; for anything that heats or cooks, or a fridge through the night, the Classic.
Below: the five differences with numbers, a 20-second calculator for your own gear, eight modeled situations, the price per Wh, a middle option, and what published tests found.
The Classic stores 3.6 times the energy, delivers three times the output and takes 280W more solar. The RIVER 3 Plus weighs 16.2 lb less, adds a 12V car socket, takes one extra battery and carries a 5-year warranty with nothing to register. Both switch in 10ms. 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.
- you run 1,800W loads
- you need 1kWh tonight
- a fridge must last the night
- you carry it: 10.4 lb
- you want a 12V socket
- a router or modem on a 10ms UPS
The five differences that decide it
Both use LFP cells, switch to battery in 10ms, refill from the wall in about an hour and use the EcoFlow app over Wi-Fi and Bluetooth. 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 243Wh on the RIVER 3 Plus, without its extra battery; CyberShack measured 228Wh from an Australian RIVER 3 Plus.
Appliance for appliance, the Classic lasts 3.6 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 Classic stores twice as much and runs 1,800W. EcoFlow US prices move often; the figures here are refreshed daily by our price engine.
The third option: the RIVER 2 Pro at $369
EcoFlow RIVER 2 Pro: $369 today
Between the two: 768Wh of LFP and 800W from four outlets, X-Boost to 1,600W, a 12V car socket, 220W of solar and a 70-minute wall refill, at 18.2 lb, with a 5-year warranty and nothing to register. It runs a fridge through an evening and keeps a 12V socket, at about two thirds of the Classic’s weight. Its switchover is under 30ms, slower than the 10ms of the other two, so it’s not the pick for a desktop PC, and it takes no extra battery. Our RIVER 2 Pro review goes deeper. See the RIVER 2 Pro 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 RIVER 3 Plus through the evening meal.
A full-size fridge, nothing else
About 14 hours on the Classic, four on the RIVER 3 Plus. Check your fridge’s startup draw against the RIVER’s 600W and 1,200W surge.
A microwave during an outage
1,100W is almost twice the RIVER’s rating, and X-Boost only helps heating elements. The Classic runs it.
CPAP, one night
The Classic carries two nights and a half. The RIVER 3 Plus covers about six hours of a night, a full night with its extra battery.
A 12V cooler on a road trip
The RIVER 3 Plus feeds the cooler straight from its car socket, for about 5 hours without its extra battery. The Classic runs it through an AC outlet with the cooler’s own adapter, for about 19 hours.
Refill from solar, each at its maximum
The RIVER fills sooner because it holds far less. EcoFlow says as fast as 1.5 hours for the RIVER 3 Plus and about 2.5 for the Classic.
Refill from the wall before a storm
About an hour on both: the Classic pulls 1,400W, the RIVER 380W for a much smaller battery.
Carrying it
The RIVER 3 Plus goes anywhere with one hand. The Classic is a one-hand carry too, but not one you take on a hike.
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 RIVER 3 Plus weight, dimensions and full specifications
Weight: 26.6 lb for the DELTA 3 Classic and 10.4 lb for the RIVER 3 Plus. Dimensions: 15.7 × 7.9 × 11.1 in and 9.2 × 9.1 × 5.8 in. Everything else is in the sheet below.
EcoFlow DELTA 3 Classic 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 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
RIVER 3 Plus
- RIVER 3 Plus286Wh, 10.4 lb
- AC charging cable
- Manual
- Extra battery sold separately
From the EcoFlow US product pages and the Classic’s manual.
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 unitRIVER 3 Plus: 380W AC input, 220W solar at 11 to 55V, per EcoFlow US
Our solar times assume panels deliver 70% of their rating; the brands’ figures assume ideal sun.
Every port, side by side
DELTA 3 Classic
RIVER 3 Plus
Practical consequence: same three AC outlets, but the Classic’s carry 1,800W and the RIVER’s 600W. The RIVER adds a 12V car socket and a second USB-A; the Classic adds a second USB-C.
09 · NoiseNoise and heat: Classic vs RIVER 3 Plus
EcoFlow rates the EcoFlow DELTA 3 Classic at 30dB or less at 600W and the EcoFlow RIVER 3 Plus at Under 30dB EcoFlow.
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: 33dB at full load from 2 m (CyberShack, Australian unit).
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 RIVER 3 Plus
The EcoFlow DELTA 3 Classic 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 an IP54 rating.
Figures from the DELTA 3 Classic manual and EcoFlow US for the RIVER 3 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 Classic adds Storm Guard; the EcoFlow RIVER 3 Plus adds expansion.
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 RIVER 3 Plus takes one EB300 or EB600 battery, to 858Wh.
Does it prepare for storms? The EcoFlow DELTA 3 Classic charges ahead of severe weather with Storm Guard; EcoFlow lists no such feature for the EcoFlow RIVER 3 Plus.
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 RIVER 3 Plus has no Smart Generator link listed.
Does it work as a UPS? The EcoFlow DELTA 3 Classic switches in 10ms; the EcoFlow RIVER 3 Plus switches in under 10ms, and StorageReview measured 9ms.
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 3 years, plus 2 more once registered in the EcoFlow app, and the EcoFlow RIVER 3 Plus 5 years with nothing to register.
Same 5 years at most; only the RIVER 3 Plus needs no registration.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 RIVER 3 Plus, 3,000 cycles to 80%, about 8 years at one full cycle a day. 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.
What reviewers report
We have not lab-tested these two units. Here is what 6 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)RIVER 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- ClassicReviewer There is no 12-volt car socket for DC devices like cool boxes. Basic Tutorials, Simon Lüthje, March 2026, EU unit
- 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 stops at 600W. A microwave, a kettle or a hair dryer on high won’t run on it; X-Boost runs heating loads up to 1,200W at reduced power.
- The Classic has no 12V socket. Basic Tutorials flagged it for cool boxes and other DC gear.
- The Classic can’t be expanded. The RIVER 3 Plus takes one extra battery at a time, up to 858Wh.
- The Classic’s surge figure differs: 3,000W in its manual, 3,600W on its product page. Plan on the lower one.
- The RIVER’s IP54 rating covers the battery pack only, not the whole unit and not immersion.
- Neither charges below freezing. The Gadgeteer’s RIVER 3 Plus refused to charge in a 27°F garage.
- Register the Classic in the app for its full 5 years; the RIVER 3 Plus needs nothing.
Frequently asked questions
What is the difference between the EcoFlow DELTA 3 Classic and the RIVER 3 Plus?
The Classic stores 1,024Wh against 286Wh and delivers 1,800W against 600W. The RIVER 3 Plus weighs 10.4 lb against 26.6 lb, adds a 12V car socket and takes one extra battery, up to 858Wh.
Can the RIVER 3 Plus run a microwave?
No. A typical microwave draws over 1,000W, almost twice its 600W rating. The Classic runs a 1,100W microwave for about 47 minutes.
Which is better as a UPS for a router?
Both switch in 10ms; StorageReview measured 9ms on the RIVER 3 Plus. For a router and a modem, about 25W, the RIVER lasts about 10 hours, the Classic about 35.
How long will each run a refrigerator?
At a 60W average: about 14.5 hours on the Classic and 4.1 hours on the RIVER 3 Plus without its extra battery.
Can I add a battery to either?
Only to the RIVER 3 Plus: one EB300 or EB600, up to 858Wh. The Classic has no battery port.
Which charges faster?
Both refill from the wall in about an hour. From solar, the RIVER fills sooner because it holds less.
How much do they weigh?
26.6 lb for the Classic and 10.4 lb for the RIVER 3 Plus.
Which has the better warranty?
The RIVER 3 Plus: 5 years with nothing to register. The Classic gets 3 years, 5 once registered in the EcoFlow app.
Is there a middle option?
The RIVER 2 Pro: 768Wh and 800W from four outlets, 220W of solar, at 18.2 lb, with a 5-year warranty.
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, RIVER 3 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 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).
The Classic holds 3.6 times the energy and runs 1,800W; the RIVER 3 Plus weighs 10.4 lb and has a 12V socket. EcoFlow US hasn’t listed it since Nov 4, 2026.
Prices checked November 13, 2026 at 9:29 AM EST
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Originally published: November 9, 2026