DELTA 3 Classic
- you run kitchen gear: up to 1,800W
- a PC rides on it: 10ms switchover
- you want the bigger battery: 1,024Wh
RIVER 2 Pro
- your loads stay under 800W
- you run a 12V cooler or carry it: 18.2 lb
- you want 768Wh for $110 less
Prices and stock checked by our price engine on November 13, 2026 at 3:29 AM EST. Each product is rechecked several times a day; the time refreshes when you load the page.
The gap buys a microwave and a desktop PC. If you run neither, keep the money and the lighter box.
The EcoFlow DELTA 3 Classic stores 1,024Wh and delivers 1,800W from three AC outlets, switches to battery in 10ms and refills from the wall in about an hour, at 26.6 lb. The EcoFlow RIVER 2 Pro stores 768Wh and delivers 800W, but from four outlets, with a 12V car socket and two DC barrels the Classic lacks, at 18.2 lb and $110 less today. Neither takes an extra battery. If nothing you plug in draws more than 800W and no PC rides on it, the RIVER 2 Pro is the better buy.
Below: every difference with numbers, a 20-second calculator for your own gear, eight modeled situations, a third option that grows, and what published tests found on each.
Same brand, same app, neither expandable. The DELTA 3 Classic costs $110 more today and buys 256Wh more battery, 1,000W more output, a 10ms switchover and 280W more solar. The RIVER 2 Pro answers with one more AC outlet, a 12V car socket, two DC barrels, 8.4 lb less and 5 years of warranty with no registration.
- you run more than 800W
- a PC needs 10ms
- you charge from 500W of solar
- you carry it: 18.2 lb
- you run 12V gear
- loads stay under 800W
The five differences that decide it
Both use LFP cells, both have a 100W USB-C port, both work with the EcoFlow app over Wi-Fi and Bluetooth, and neither takes an extra battery. 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 DELTA 3 Classic and 650Wh on the RIVER 2 Pro; OutdoorGearLab measured 600Wh out of the RIVER 2 Pro.
Appliance for appliance, the Classic lasts 33% longer than the RIVER 2 Pro.
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 Classic costs $110 more than the EcoFlow RIVER 2 Pro and adds 256Wh: that is $0.43 per extra Wh, against $0.48 per Wh for the RIVER 2 Pro.
Prices refresh daily from EcoFlow US.What the $110 buys: a third more battery (1,024Wh vs 768Wh), 1,800W instead of 800W and a 10ms switchover.
Per Wh the two sit close, and which one leads depends on the week’s sale, so read the live figures above. EcoFlow rates the RIVER 2 Pro for 3,000 cycles to 80%; its US page gives the Classic no cycle rating, so a lifetime cost can only be worked out for the RIVER. Neither can grow: if 1kWh may not be enough in two years, the DELTA 3 is the route that grows, since one extra battery takes it to 2,048Wh in the same system.
The third option: the EcoFlow DELTA 3 at $579
EcoFlow DELTA 3: $579 today
Neither of these takes an extra battery. The DELTA 3 is the one that does: the same 1,024Wh, 1,800W and 10ms switchover as the Classic, six AC outlets, a 126W car socket and two DC barrels, 5 years of warranty with no registration and expansion to about 5kWh with EcoFlow extra batteries, at 27.6 lb. It costs $100 more than the Classic today. Our DELTA 3 review and DELTA 3 Classic vs DELTA 3 go deeper. See the DELTA 3 at EcoFlow.
Eight modeled situations, worked out
Same formula as the calculator above, with no extra battery. The fridge averages 60W, about 525kWh a year.
24-hour outage, essentials only
The DELTA 3 Classic runs about two and a half hours longer. Neither covers a full day, and neither takes a second battery, so solar is the way to stretch either one.
Microwave or coffee maker
Only the DELTA 3 Classic runs them. X-Boost lifts the RIVER 2 Pro to 1,600W for heating loads at lower voltage, but a microwave isn’t one of them.
A desktop PC through a blackout
Desktop power supplies built to the ATX spec ride through about 16ms at full load. The Classic’s 10ms is inside that; the RIVER 2 Pro’s EPS may not be.
CPAP, two nights
The Classic covers two nights with room to spare. The RIVER 2 Pro only just: OutdoorGearLab measured 600Wh out of it, so plan a top-up, and its fan can be high-pitched while charging.
A 12V cooler on a road trip
The Classic has no 12V socket, so the cooler runs on its AC brick, which wastes some energy and keeps the inverter on. The RIVER 2 Pro plugs it straight in.
Refill from solar, each at its maximum
The Classic refills its bigger battery about two hours sooner. The RIVER 2 Pro’s 220W limit makes it a one-panel unit; OutdoorGearLab put a 200W panel at about 4 hours in ideal sun.
Refill from the wall before a storm
Both are fast. The Classic reaches 80% in 45 minutes, per EcoFlow; OutdoorGearLab measured 75 minutes to full on the RIVER 2 Pro.
Carrying it to a campsite
The RIVER 2 Pro is 8.4 lb lighter; the Classic is still a one-person carry.
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 2 Pro weight, dimensions and full specifications
Weight: 26.6 lb for the DELTA 3 Classic and 18.2 lb for the RIVER 2 Pro. Dimensions: 15.6 × 7.8 × 11.2 in and 10.6 × 10.2 × 8.9 in. Everything else is in the sheet below.
EcoFlow DELTA 3 Classic and EcoFlow RIVER 2 Pro 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 2 Pro
- RIVER 2 Pro768Wh, 18.2 lb
- AC charging cable
- Quick start guide
- Solar and car cables sold separately
From the brands’ US product pages and manuals.
07 · ChargingHow fast each one refills
Shorter bar, faster refill. Each row is scaled to its slower unit.
DELTA 3 Classic: one XT60i input shared by solar and car charging (96W)RIVER 2 Pro: USB-C input up to 100W, car input 100W
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 2 Pro
Practical consequence: the RIVER 2 Pro has one more AC outlet, two more USB-A ports, a 12V car socket and two DC barrels, and can charge from USB-C. The DELTA 3 Classic adds a second USB-C (30W) and nothing at 12V.
09 · NoiseNoise and heat: Classic vs RIVER 2 Pro
The EcoFlow DELTA 3 Classic is the quieter one on paper: EcoFlow rates it at 30dB or less at 600W, and says the EcoFlow RIVER 2 Pro can reach 62dB at high charge or discharge.
These are EcoFlow’s figures. We found no independent dB measurement of either.Every figure we found, with its source
What reviewers heard: Fans audible and the battery at 127°F (53°C) in the app during an 1,800W grill test on a 230V unit (Basic Tutorials).
What reviewers heard: High-pitched, unpredictable fan during charging and heavy draw, a problem at a desk or beside a CPAP at night (OutdoorGearLab).
Measured by a tester Brand figure
- Lower the AC charging speed in the EcoFlow app overnight.
Cold and heat: Classic vs RIVER 2 Pro
The EcoFlow DELTA 3 Classic and the EcoFlow RIVER 2 Pro share the same limits: charging from 32°F to 113°F, running from 14°F to 113°F. Neither has a water rating.
Figures from EcoFlow US and the DELTA 3 Classic manual.- Charge either one indoors in winter: neither charges below 32°F.
- In a car or garage below 14°F, bring it inside before you run it.
App, UPS and smart features
The EcoFlow DELTA 3 Classic does more for a home: a true 10ms UPS, Storm Guard and timed charging. The EcoFlow RIVER 2 Pro keeps to the basics, with a slower EPS.
Same EcoFlow app over Wi-Fi and Bluetooth. Neither takes an extra battery.Green zone: a switch under about 16ms, which most desktop PCs ride through without restarting.
Does it prepare for storms? The EcoFlow DELTA 3 Classic’s Storm Guard starts a charge when a weather alert hits your area; EcoFlow lists no storm mode for the EcoFlow RIVER 2 Pro.
Can it charge off-peak? The EcoFlow DELTA 3 Classic has timed charging and discharging missions in the app; EcoFlow lists none for the EcoFlow RIVER 2 Pro.
Can it start a generator by itself? EcoFlow says its Smart Generator auto start doesn’t work with the EcoFlow DELTA 3 Classic; it lists no such feature for the EcoFlow RIVER 2 Pro. Both charge from a generator through their AC input.
Does it work as a UPS? EcoFlow rates the EcoFlow DELTA 3 Classic at 10ms, inside the roughly 16ms desktop power supplies ride through. The EcoFlow RIVER 2 Pro’s EPS switches in under 30ms, fine for a fridge or a router, borderline for a desktop PC.
Can you add a battery later? Neither the EcoFlow DELTA 3 Classic nor the EcoFlow RIVER 2 Pro takes an extra battery. The EcoFlow DELTA 3 is the expandable option.
Can it run a heater or kettle above its rating? Both run resistive loads past the rating at reduced power with X-Boost: up to 2,600W on the EcoFlow DELTA 3 Classic, 1,600W on the EcoFlow RIVER 2 Pro.
How does the app connect? Both use the EcoFlow app over Wi-Fi and Bluetooth for monitoring, outputs, charge limits and AC charging speed.
Warranty and support
The EcoFlow RIVER 2 Pro has 5 years with nothing to do; the EcoFlow DELTA 3 Classic gets 3 years, plus 2 more once you register it in the EcoFlow app.
Same 5 years at best. Only the Classic asks you to register.Subject to each brand’s warranty terms and eligibility.
EcoFlow rates the RIVER 2 Pro for 3,000 cycles to 80%, about 8 years at one full cycle a day. Its US page gives the DELTA 3 Classic no cycle rating. Heat and age also wear a battery, so read any rating as a ceiling.
- If you choose the DELTA 3 Classic, register it in the EcoFlow app the day it arrives: without registration, the warranty stops at 3 years.
- The RIVER 2 Pro needs no registration for its 5 years; keep the proof of purchase.
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)RIVER 2 Pro: OutdoorGearLab (January 2026), Digital Trends (April 2023), Camera Jabber (June 2023, UK unit)
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 2 ProReviewer Measured 600Wh from the 768Wh battery, which the testers call its one glaring weakness. OutdoorGearLab, Kenji Mowrey, January 2026
- RIVER 2 ProReviewer A smart plug logged about 600Wh across several full cycles, short of the 768Wh rating. Digital Trends, Simon Sage, April 2023
Charging
- ClassicReviewer A full wall charge took just under 55 minutes on the European unit (1,400W AC input, 230V charging). Basic Tutorials, Simon Lüthje, March 2026, EU unit
- RIVER 2 ProReviewer Measured charge rate of 614Wh per hour on AC; full charge possible in about 75 minutes. OutdoorGearLab, Kenji Mowrey, January 2026
- RIVER 2 ProReviewer Solar input capped at 220W; a 200W panel in ideal sun takes about 4 hours. OutdoorGearLab, Kenji Mowrey, January 2026
- RIVER 2 ProReviewer Topped up in about an hour, versus roughly three hours the reviewer is used to in this class. Digital Trends, Simon Sage, April 2023
- RIVER 2 ProReviewer Recharged fully during a pub lunch break; the review states 0-100% in 70 minutes on UK mains (230V, not US-comparable). Camera Jabber, Camera Jabber Team (no named author), June 2023, UK 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 2 ProReviewer High-pitched, unpredictable fan during charging and heavy draw, a problem at a desk or beside a CPAP at night. OutdoorGearLab, Kenji Mowrey, January 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
- RIVER 2 ProReviewer A full-size TV plus gaming PC ran for about an hour; an electric kettle boil used about 10% of the battery. Digital Trends, Simon Sage, April 2023
- RIVER 2 ProReviewer Kept a Rotolight ANOVA Pro II light running an estimated 10 hours; heaters, irons and vacuums tripped it even with X-Boost. Camera Jabber, Camera Jabber Team (no named author), June 2023, UK unit
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
Practical limits before you buy
- The RIVER 2 Pro stops at 800W. A microwave, a coffee maker or a hair dryer overloads it; X-Boost only helps heating loads at lower voltage.
- The RIVER 2 Pro’s EPS is under 30ms. Fine for appliances, borderline for desktop PCs.
- Neither can be expanded. 1,024Wh and 768Wh are the ceilings; the DELTA 3 is the one that grows.
- The DELTA 3 Classic has no 12V car socket and no DC barrels.
- The Classic’s single XT60i input handles solar or car charging, not both at once.
- The Classic’s surge depends on where you read it: 3,000W in the manual, 3,600W on EcoFlow’s page. Plan on 3,000W.
- Register the Classic in the app to get its full 5 years; the RIVER 2 Pro needs nothing.
Frequently asked questions
What is the difference between the EcoFlow DELTA 3 Classic and the RIVER 2 Pro?
The DELTA 3 Classic stores 1,024Wh and delivers 1,800W from three outlets, with a 10ms switchover. The RIVER 2 Pro stores 768Wh and delivers 800W from four outlets, with an EPS under 30ms, a 12V car socket and two DC barrels, at 18.2 lb.
Which is cheaper?
The EcoFlow RIVER 2 Pro costs $110 less today: $369, against $479 for the EcoFlow DELTA 3 Classic. Prices refresh daily; the price section above has the full breakdown.
Can the RIVER 2 Pro run a microwave?
No: a typical microwave draws about 1,100W, above its 800W rating, and X-Boost doesn’t apply to microwaves. The DELTA 3 Classic runs one.
Which lasts longer on a charge?
The DELTA 3 Classic: about 870Wh usable against 650Wh. Neither takes an extra battery.
Which is better as a UPS for a computer?
The DELTA 3 Classic, rated at 10ms; the RIVER 2 Pro’s EPS is under 30ms.
Which charges faster?
From the wall, the Classic by about 10 minutes; from solar, the Classic by far, with 500W against 220W.
Which is better for camping?
The RIVER 2 Pro if you carry it and run a 12V cooler, lights, a CPAP and phones; the DELTA 3 Classic if you cook on it.
How much do they weigh?
26.6 lb for the DELTA 3 Classic and 18.2 lb for the RIVER 2 Pro.
Related comparisons and reviews
How we compared and sources
Research-based comparison. We have not physically tested these two units. Specs come from EcoFlow’s US product pages and the DELTA 3 Classic manual; usage observations are attributed to named reviewers. Prices and availability were checked on October 31, 2026.
- Specs: EcoFlow US, DELTA 3 Classic and the DELTA 3 Classic user manual (EF-DL3-C), and EcoFlow US, RIVER 2 Pro, read on October 31, 2026.
- Reviewer reports on the DELTA 3 Classic: Basic Tutorials, Simon Lüthje, March 2026, EU unit; on the RIVER 2 Pro: OutdoorGearLab, Kenji Mowrey, January 2026, Digital Trends, Simon Sage, April 2023, Camera Jabber, Camera Jabber Team (no named author), June 2023, UK unit.
- 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 DELTA 3 Classic has 1,800W and a 10ms UPS; the RIVER 2 Pro is 8.4 lb lighter, has a 12V socket and costs $110 less.
Prices checked November 13, 2026 at 3:29 AM EST
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Originally published: November 7, 2026