Head-to-head test
EcoFlow DELTA 3 vs EcoFlow RIVER 2 Pro
EcoFlow DELTA 3 vs EcoFlow RIVER 2 Pro: buy the DELTA 3 for anything with a motor or a heating element, since it runs 1,800W against 800W and takes an expansion battery; buy the RIVER 2 Pro only if you carry it on foot and your loads stay small.
Full profiles: EcoFlow DELTA 3 β Β· EcoFlow RIVER 2 Pro β
Looking for a different matchup? EcoFlow DELTA 3 Classic vs RIVER 2 Pro
Written by Ian SchneiderUpdated
Solar & Off-Grid Tester, Station Arena Test Desk
Spec deltas
The RIVER 2 Pro is the one I'd keep behind the truck seat. It weighs 17.2 lb, holds 768Wh, and goes anywhere a duffel bag goes. The DELTA 3 is ten pounds heavier, near enough, and that weight buys a lot more than a bigger battery.
Most of it goes into the inverter, the part that turns battery power into household AC. The DELTA 3 runs 1,800W steady and the RIVER 2 Pro runs 800W. That is the line between running a microwave or a kettle and not running one at all. The DELTA 3 can also take an EcoFlow expansion battery. The RIVER 2 Pro is sealed.
What the extra $280 does not buy is cheaper energy. Spread over their rated lives, both land at about the same cost per lifetime kilowatt-hour, $0.15 against $0.15. So it comes down to what you plug in and how far you walk.
What the Numbers Reveal
Each conclusion stated first β the numbers behind it on one line, the full analysis below.
continuous output
Surge is the short burst a motor pulls as it spins up, often two to three times its running draw. A small fridge has a modest kick. A bigger compressor, a well pump or a power tool is where 1,600W runs out and 3,600W keeps going.
The RIVER 2 Pro's inverter runs 800W continuous with a 1,600W surge ceilingThe DELTA 3 runs 1,800W continuous with a 3,600W surge ceilingFridge and AC compressors surge 2 to 3 times their rated draw at startup
Why it mattersIf your list includes a motor bigger than a small fridge, check its startup draw against 1,600W before you compare anything else.
rated cycles
Its price is higher in about the same proportion, so the two come out level per lifetime kilowatt-hour. Neither is the budget pick on that measure. The RIVER 2 Pro is cheaper to buy because you are buying less.
DELTA 3: 1,024Wh, 4,000 cycles, about 4,096 lifetime kWhRIVER 2 Pro: 768Wh, 3,000 cycles, about 2,304 lifetime kWhCost per lifetime kWh: $0.15 against $0.15
Why it mattersChoose on what each unit can run and how far you carry it. The running cost will not separate them.
solar input
So the DELTA 3 refills its bigger battery sooner, even with more to replace. In a multi-day outage that repeats every sunny morning. A Tahoe winter day gives you only a few good hours of sun, and I'd want the wider funnel.
The DELTA 3 accepts up to 500W of solar input against a 1,024Wh capacityThe RIVER 2 Pro accepts up to 220W of solar input against a 768Wh capacity
Why it mattersIf you are buying for outages with a panel, the solar input line deserves as much attention as the capacity line.
At a light load the real gap is narrower than the numbers suggest, and could even run the other way. What the record does show is that the RIVER 2 Pro's fans get loud when it works hard. EcoFlow says soB2, and one owner went as far as cutting away internal plastic to fit a quieter fixB1. Reviewers say the DELTA 3's fans often stay off at light loadsA1.
EcoFlow says the RIVER 2 Pro may reach up to 62 dB when charging or discharging at high wattageB2EcoFlow publishes 30 dB for the DELTA 3, a best-case figureOne owner modded the RIVER 2 Pro's internals to quiet itB1
Why it mattersFor a bedside CPAP at a light draw, noise will not pick between them. If you fast-charge it in the bedroom, the RIVER 2 Pro's fans are a known complaint.
The specific dimensions that decide these two units β everything else is a tie.
Lifetime Value
Selected because: Cost per lifetime kWh comes out level, so the price gap buys capability rather than a cheaper rate.
On the sticker the RIVER 2 Pro looks like the value pick. Divide by what each one delivers over its rated life and they come out about level: $0.15 for the DELTA 3, $0.15 for the RIVER 2 Pro. The DELTA 3 holds more per charge and is rated for more charges, and its price rises to match.
Both carry the same five-year warranty from the same company. What the $280 buys is a bigger inverter, a bigger battery and an expansion port.
Your Life, Your Pick
Selected because: The tailgate is the one job the DELTA 3 wins outright and the RIVER 2 Pro misses narrowly; CPAP passes on both.
Weekend camping, the 8-hour blackout, the remote workday and van life all beat both units. On the workday the DELTA 3 comes within 40Wh, close enough to finish with one device unplugged. The RIVER 2 Pro ends 257Wh short.
The tailgate is the job the DELTA 3 wins outright, with 200Wh to spare. The RIVER 2 Pro misses it by 17Wh, so trimming one small load gets it there. Both cover a CPAP night with plenty left.
What the Specs Don't Tell You
Selected because: The noise figures are different kinds of number; expansion and UPS speed are the spec-true tiebreakers.
rated cycles
Five cards fire. Warranty is a tie at five years. Cycle life favours the DELTA 3. The noise card compares a maximum with a best case, so it cannot pick a winner, though it does confirm the RIVER 2 Pro's fans get loud under heavy load.
Expansion and switchover are the two that count. The RIVER 2 Pro is sealed at 768Wh. In UPS mode, where the unit takes over the instant wall power drops, the DELTA 3 is rated at 10ms or less and the RIVER 2 Pro at 30ms or less. Many desktop PCs will not ride through 30ms, so a computer with unsaved work is safer on the DELTA 3.
Growth Path
Selected because: The DELTA 3's expansion port is a structural advantage the RIVER 2 Pro cannot match.
solar input
The DELTA 3 takes EcoFlow expansion batteries, so the 1,024Wh you buy today can grow without replacing the station. The RIVER 2 Pro is sealed. Outgrow 768Wh and the only move is a second unit.
At this size, expansion means more hours on the same loads rather than a path to whole-home backup. If your list is still growing, that port and the bigger inverter are the reasons I'd buy the DELTA 3.
Strengths & trade-offs
EcoFlow DELTA 3
Strengths
- +Larger battery capacity
- +Higher AC output
- +Faster solar charging
- +Rated for 4,000 charge cycles β much longer battery lifespan
Trade-offs
- βSubstantially more expensive (+$280) than the RIVER 2 Pro.
EcoFlow RIVER 2 Pro
Strengths
- +Costs $280 less
- +Lighter by 9.8 lb
Trade-offs
- βWeaker inverter (-1,000W) limits appliance compatibility.
- βCan receive complaints about fan noise under heavy load.
- βSealed capacity β the DELTA 3 can add batteries to grow past 768Wh; this one can't.
- βShorter-lived battery β rated for 3,000 charge cycles vs the DELTA 3's 4,000, so it wears out sooner.
Will It Power Your Gear?
Scenario math and per-appliance runtimes, modeled from the spec record.
Scenario verdicts
We ran the math on six real-world scenarios. Here's which unit survives your actual life.
SCN-01 Β· 2 nights Β· needs 2,100Wh
Weekend Camping
Two nights off-grid with essential comfort
Neither unit
Neither unit covers this scenario's 2,100Wh: the DELTA 3 comes up 1,230Wh short (about 41% covered), the RIVER 2 Pro 1,447Wh (31%). Treat this as partial cover β enough for the essentials in it, not the whole list.
Battery budget usedlower = more headroom
LOADΒ Β Phone Charger 15WΓ6h Β· LED Lights 40WΓ8h Β· Box Fan 75WΓ14h Β· CPAP Machine 40WΓ16h
SCN-02 Β· 8 hours Β· needs 1,645Wh
8-Hour Blackout
Keep the essentials running through a night without power
Neither unit
Neither unit covers this scenario's 1,645Wh: the DELTA 3 comes up 775Wh short (about 53% covered), the RIVER 2 Pro 992Wh (40%). Treat this as partial cover β enough for the essentials in it, not the whole list.
Battery budget usedlower = more headroom
LOADΒ Β Fridge 150WΓ8h Β· Router + Modem 20WΓ8h Β· LED Lights (4 bulbs) 40WΓ6h Β· Phone Charger 15WΓ3h
SCN-03 Β· 8 hours Β· needs 320Wh
CPAP Overnight
Sleep therapy without interruption β the #1 medical use case
Either unit
A CPAP is about 40W for eight hours, so both of these cover the night at least twice over β capacity isn't the question here. The only published difference is fan noise, and it can't settle this: the DELTA 3 is rated 30dB and the RIVER 2 Pro 62dB, but the DELTA 3's is its maker's best case and the RIVER 2 Pro's is EcoFlow's maximum under heavy charge and discharge, so at a 40W draw the real gap can only be narrower than it looks, and may even run the other way. Neither settles which box is quieter at a bedside. Buy whichever is cheaper or easier to carry.
Battery budget usedlower = more headroom
LOADΒ Β CPAP Machine 40WΓ8h
SCN-04 Β· 8 hours Β· needs 910Wh
Remote Workday
Full work day off-grid without power anxiety
Neither unit
This scenario needs 910Wh and neither unit quite finishes it. The DELTA 3 lands within 5% of it β close enough that trimming one appliance, or accepting a shorter evening, gets you there on the day.
Battery budget usedlower = more headroom
LOADΒ Β Laptop 60WΓ8h Β· External Monitor 30WΓ8h Β· Router + Modem 20WΓ8h Β· Phone Charger 15WΓ2h
SCN-05 Β· 4 hours Β· needs 670Wh
Tailgate Party
Game day power for the crew
DELTA 3
The RIVER 2 Pro comes up just short β it needs 670Wh and has 653Wh usable, a 17Wh gap (its nameplate 768Wh actually clears this β the flat 15% conversion allowance is what tips it under). Trim that much β one small appliance's worth across the day β and it finishes. The DELTA 3 covers it outright with 200Wh to spare.
Battery budget usedlower = more headroom
LOADΒ Β Blender 400WΓ0.5h Β· LED TV (55") 80WΓ4h Β· Bluetooth Speaker 15WΓ4h Β· Phone Charger (Γ3) 45WΓ2h
SCN-06 Β· 24 hours Β· needs 4,685Wh
Van Life Daily
A full day of mobile living β the ultimate endurance test
Neither unit
Neither unit covers this scenario's 4,685Wh: the DELTA 3 comes up 3,815Wh short (about 19% covered), the RIVER 2 Pro 4,032Wh (14%). This is well outside what either unit is for; the right answer here is a larger station, not a choice between these two.
Battery budget usedlower = more headroom
LOADΒ Β Mini-Fridge 150WΓ24h Β· Laptop 60WΓ4h Β· Phone Charger 15WΓ3h Β· LED Lights 40WΓ5h Β· Fan 75WΓ8h
The Load Test
RUNTIME = (Wh Γ 0.85) Γ· LOAD
None of the scenarios above exactly yours? Build it. Toggle what you'd plug in; both units are tested against the combined draw.
Essentials
Comfort & Convenience
High-Draw Appliances
Test duration
8h
Continuous draw
205W
Projected runtime
For this load: DELTA 3 runs 4.2h vs 3.2h.
$629 list Β· direct from EcoFlow
Planning for more than this? Describe your whole setup and get it sizedΒ β
Modeled from the spec record β same math as the tables below. Methodology
Runtime by appliance
Real-world runtime estimates for common appliances, modeled at 85% inverter efficiency.ΒΉ
Essentials
The basics you need runningscale 0β58hComfort & Convenience
Makes off-grid life actually enjoyablescale 0β11.6hHigh-Draw Appliances
These reveal the real limitsscale 0β0.9hΒΉ Runtime = (capacity Γ 0.85) Γ· appliance watts. Within each group, all bars share one time scale (the group's longest runtime), so lengths are comparable across appliances; identical runtimes collapse into a single blue/orange bar. Actual runtime varies with battery age, temperature, and simultaneous loads β see methodology.
Conclusion
October 25, 2026
Verdict: the DELTA 3, on Power Score margin
The DELTA 3 holds 1,024Wh against 768Wh, runs an 1,800W inverter against 800W with a 3,600W surge peak against 1,600W, and takes an EcoFlow expansion battery the RIVER 2 Pro cannot. It is also rated for 4,000 cycles to 3,000 and takes more than twice the solar input. Per lifetime kilowatt-hour the two come out about level, $0.15 against $0.15, so the extra $280 buys capability at the same rate. The RIVER 2 Pro's honest case is weight: 17.2 lb against 27, which matters if you carry it in on foot.
Today the DELTA 3 is $599, $30 under its typical $629. The verdict weighs typical prices, not today's. Prices checked 28 days ago.
Editor-assigned confidence, based on cited owner research and spec analysis.
List prices as of October 25, 2026. The links below open EcoFlow's current price.
$599.00 Β· direct from EcoFlow
down from $629 Β· 5% below usual
Last checked 28 days ago. Prices move β check before you buy.
or check the RIVER 2 Pro price$389.00 list
Written by Ian Schneider, Solar & Off-Grid Tester Β· Station Arena Test Desk Β· Updated October 25, 2026
Black Friday Β· 26 days out
Prices to beat:DELTA 3 $519RIVER 2 Pro $349
The lowest we have recorded for each. We have never seen the RIVER 2 Pro discounted, so any real cut on it would be a first.
Measured Data
Benchmark scores and the full spec record, side by side.
Benchmark scores
Not rated for both units (minimum threshold unmet): UPS, RV Living, Home Backup, Food Truck.
Full specifications
α΅ Derived: price Γ· rated capacity. See the data behind our comparisons β
Comparison ToolAdd more power stations, side by sideOpen Tool βHow these numbers are produced
Numeric verification
Every figure on this page traces to our spec database or arithmetic on it β no estimated numbers.
Owner claims
Statements about owner experience are cited to published reviews β see Sources & Research Notes below.
Runtime model
Runtime = (rated capacity Γ 0.85 inverter efficiency) Γ· device wattage. Solar recharge estimates assume panels deliver 70% of rated output. Cold weather, battery age, and stacked loads reduce real-world results.
Power Score
Computed from 14 published spec dimensions, weighted per use-case bench. Higher is better; a unit must meet a bench's minimum threshold to be rated.
See the full weight table and data sourcing on our methodology page βClass ranking (the star rating)
Each unit's star score is a category ranking, not customer reviews β no buyer opinions feed it. We score every station on size-independent quality (value, output, portability, endurance, ports, warranty, and more), then percentile-rank it against the other units in its capacity class, so a class-leading compact unit and a class-leading whole-home unit can both earn 5β . Here, DELTA 3 rates 4.5/5 (73rd percentile of 27 Everyday-class units), and RIVER 2 Pro rates 4.7/5 (84th percentile of 20 Compact-class units).
How the class ranking is computed βTest Notes & Caveats
Hidden gotchas and advantages we spotted that you won't find on the product page.
RIVER 2 Pro: 62dB Published
62dB is about as loud as a normal conversation. The DELTA 3 is rated 30dB, and the two are not the same kind of figure: the RIVER 2 Pro's is a MAXIMUM under heavy charge and discharge, while the DELTA 3's is its maker's best case β so the real gap can only be narrower than the numbers suggest, and may even run the other way. For most people, fan noise around 45dB and up is where sleep starts to suffer.
RIVER 2 Pro: Fixed Capacity
The RIVER 2 Pro is sealed at 768Wh β fine if that covers you, but it's the ceiling. By contrast the DELTA 3 can add expansion batteries, though the first thing it has over the RIVER 2 Pro is its own 1,024Wh base β expansion is the step after that, for the buyer who would outgrow 1,024Wh as well.
UPS Switchover: β€10ms vs β€30ms
Both list a UPS mode, at different rated speeds. The DELTA 3 is rated β€10ms β quick enough on paper that desktop PCs and routers should ride through, treating that as the rating it is. The RIVER 2 Pro is rated β€30ms β a transfer this long is one many desktops will NOT ride through, so plan on reboots for sensitive gear. If a computer with unsaved work is the thing being protected, the stated class is worth the attention; nothing here is a lab result.
Warranty: No Difference
Both units carry the same 5-year warranty, so coverage isn't a tiebreaker here. Worth saying because the per-dollar framing can suggest otherwise: the RIVER 2 Pro works out at 14.3 years of cover per $1,000 spent against the DELTA 3's 7.9, but that spread is the price gap, not the terms.
Battery Lifespan in Real Years
The DELTA 3 is rated for 4,000 cycles vs 3,000. In real life: at daily use, that's 11 vs 8.2 years. At weekend use (twice a week), it's 38 vs 29 years. One caution reading years across different sizes: a cycle is 1,024Wh on the DELTA 3 and 768Wh on the RIVER 2 Pro, so count lifetime energy β roughly 4,096 kWh against 2,304 kWh over the rated life. After hitting the cycle limit, the battery doesn't die β it drops to ~80% of original capacity, which is still very usable.
Full record above β the Test Desk pick is the DELTA 3.
Check DELTA 3 price βor check the RIVER 2 Pro priceOwnership Analysis
What happens after you buy β true cost of ownership, brand trust, and growth potential.
Lifetime value
Service lifeyears at one full cycle per day
Lifetime energy delivered
Cost per delivered kWh
β warranty ends Β· Reaching the cycle rating means ~80% capacity remains β degraded, not dead.
Analyst note
Both units cost the same to own over their rated lives β $0.15/kWh each. Lifetime cost can't separate them, so decide on the sticker price and everything else.
Growth path
DELTA 3
EXPANDABLESupports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit β useful if your needs may climb past 1,024Wh.
Accepts up to 500W of solar. Suitable for a 1-2 panel setup.
Generous port selection supports complex multi-device setups.
Expansion batteries are EcoFlow-specific. You're investing in the EcoFlow ecosystem.
RIVER 2 Pro
FIXED CAPACITYFixed at 768Wh, with no expansion β so size it for your needs up front rather than planning to add capacity later.
Accepts up to 220W of solar. Limited to a single portable panel.
Adequate ports for most setups, but heavy users may want a power strip.
Realistic full solar rechargeat 70% of rated panel output β see methodology
Analyst note
The RIVER 2 Pro is sealed at 768Wh, which is fine if that covers you. The DELTA 3 starts at 1,024Wh and can grow beyond it with EcoFlow expansion batteries β though at this size expansion means longer runtimes on the same loads, not a path to home backup. More hours, not more house.
What Owners Report
Patterns from published owner reports and long-term reviews β every claim cited to its source below.
EcoFlow DELTA 3
Most published testing on this line covers the DELTA 3 Plus, Max and Ultra rather than the standard model, so treat this as an early readA0. What is tied to the standard DELTA 3 is about noise. The fans often stay off at light loads and are described as barely audible at moderate onesA1.
Reports of the 10ms UPS handoff keeping routers and CPAPs running through a cut come from a sibling with the same spec, so they describe the line rather than this boxA2. Nothing we found flags a hardware complaint specific to this model. There simply is not much written about it yet.
βAt low loads (under 200W) the fans often stay completely off, making the Delta 3 effectively silent; under moderate load (500β800W) the fans are barely audible from three feet away.β
Sources
portablepowernerd.com Β· thesolarlab.com Β· outputreport.com
EcoFlow RIVER 2 Pro
Owner commentary specific to the RIVER 2 Pro is thinB0. The one consistent theme is fan noise. EcoFlow itself says the RIVER 2 Max and RIVER 2 Pro may reach up to 62 dB when charging or discharging at high wattageB2. One owner modded the RIVER 2 Pro's internals to quiet it, cutting away some internal plastic to make the fix fitB1.
Another owner asked whether using it as a UPS wears the battery fasterB3. We found no clear answer in the record.
βWill using River 2 Pro as a UPS affect battery life ...β
Sources
ctrl-alt-rees.com
Sources & Research Notes
Every owner claim in this report is traceable to a published source. The bracketed references above resolve here.
Recurring owner themes
- Fan noise at high wattage charging/discharging is a consistent owner and manufacturer-acknowledged complaint, severe enough that some owners physically mod the unit with quieter fans. [RIVER 2 Pro Β· 2 entries]
- A1
βAt low loads (under 200W) the fans often stay completely off, making the Delta 3 effectively silent; under moderate load (500β800W) the fans are barely audible from three feet away.β
portablepowernerd.com β EcoFlow Delta 3 Tested: 2026 Hands-On Review; thesolarlab.com Β· 2026 Β· [positive]
- A2
βUPS switchover works as advertised β a power cut results in a ~10ms handoff, fast enough that routers don't reset, fridges don't skip a compressor cycle, and CPAP machines don't interrupt therapy.β
outputreport.com / thesolarlab.com β DELTA 3 line UPS testing (observed on DELTA 3 Plus, which shares the 10ms UPS spec) Β· 2026 Β· [positive]
- B1
βI've since performed the same mod on my RIVER 2 PRO and it works great for that unit, too - although it did involve cutting away some of the internal plastic.β
ctrl-alt-rees.com blog β 'EcoFlow RIVER 2 Noisy Fan Fix!' Β· 2022-11-17 Β· [negative]
- B2
βWhen charging and discharging at high wattage, RIVER 2 Max and RIVER 2 Pro may make a noise up to 62db.β
EcoFlow official product page β RIVER 2 Series specs/FAQ footnotes Β· unknown Β· [negative]
- B3
βWill using River 2 Pro as a UPS affect battery life ...β
Facebook β EcoFlow Club group post title Β· unknown Β· [mixed]
Research compiled October 25, 2026.
What Owners Actually Report
Drawn from 47 comments on independent review channels β not from retailer reviews, which skew to the first week of ownership. Each line is our summary of one commenter's claim, linked to the original. We record what they said, including where it contradicts the spec sheet.
EcoFlow DELTA 3
34 claims from 26 comments Β· 17 from owners Β· 7 with figures
- Solar input
- 5 Β· 27% negative
- Runtime
- 3 Β· 66% negative
- Price & value
- 4 Β· 11% negative
- Build quality
- 2 Β· 100% negative
- Inverter & surge
- 2 Β· 0% negative
What owners complain about
At 30% charge it ran a 12V cool box for only 30 minutes against a claimed 12 hours at full charge.
Runtimemeasuredowner1 agreedsource β
AC-port surge protection is rated only 150 joules versus 1,800 on his UPS, so he chained both.
Build qualitymeasuredownersource β
Four 12V 100W panels in series give an overload error despite a 60V input rating.
Solar inputmeasuredownersource β
What owners praise
The same pressure washer ran on their DELTA 3 with no errors.
Inverter & surgemeasuredowner1 agreedsource β
Charges 0-100% in 1 hour on 1,000W of solar; 800W takes only 20 minutes longer.
Solar inputmeasuredowner1 agreedsource β
Bought a DELTA 3 from a Costco sale for $389 to replace a 1500VA UPS.
Price & valuemeasuredownersource β
EcoFlow RIVER 2 Pro
32 claims from 21 comments Β· 27 from owners Β· 8 with figures
- Runtime
- 5 Β· 0% negative
- Size & weight
- 2 Β· 0% negative
- Solar input
- 2 Β· 0% negative
- Inverter & surge
- 3 Β· 23% negative
- App & firmware
- 3 Β· 0% negative
What owners complain about
Wildly fluctuating DC output on two separate units bought from different retailers.
Build qualityowner1 agreedsource β
Does tend to self-discharge, so he keeps it on the low 100W power setting.
Idle drainowner3 agreedsource β
Unit would not power on within a week of purchase despite a full charge.
Durabilityownersource β
What owners praise
Ran a portable fridge/freezer in a car for 5 hours in 110F Tucson heat, still at 78%.
Runtimemeasuredowner40 agreedsource β
At 17 lbs it is his top pick for grab-and-go power.
Size & weightmeasuredowner4 agreedsource β
Recharges back to 100% in less than an hour.
Chargingmeasuredowner4 agreedsource β
Claims are weighted by how specific they are, whether the commenter owns the unit, and how many readers agreed. Comments that mention a product under a rival's review count for more, because the commenter had no reason to be there. This is what buyers report, not our test results β for measurements we ran ourselves, see the methodology.
Who Should Buy Which
Buy the DELTA 3 if youβ¦
- βAnyone who might run a motor, such as a fridge, a pump or a power tool. 3,600W of surge starts what 1,600W may not.
- βBuyers whose needs may grow, who would rather add an expansion battery than buy a second station.
- βHome-office users: a UPS switchover rated at 10ms or less, against 30ms.
- βSolar owners: 500W of input against 220W.
Buy the RIVER 2 Pro if youβ¦
- βAnyone carrying it in on foot: 17.2 lb against 27.
- βLight users whose list is phones, laptops, lights and a CPAP, well under 800W at any moment.
If neither fits
For real home backup, a fridge, router and lights through a multi-day outage, look at the 2,000Wh-plus class. An 8-hour blackout list in our scenarios needs 1,645Wh, and the DELTA 3 covers only about half of it.
The Bottom Line
The DELTA 3 beats the RIVER 2 Pro on capacity, output, surge, solar input, cycle rating, UPS speed and expansion. Per lifetime kilowatt-hour they come out about level, so the $280 pays for all of that capability at the same rate.
If you carry it a long way on foot and your loads are small, the RIVER 2 Pro's 17.2 lb is a fair reason to choose it. For anything with a motor or a heating element, buy the DELTA 3.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Is the EcoFlow DELTA 3 worth $280 more than the RIVER 2 Pro?
For most buyers, yes. The $280 buys 256Wh more capacity, more than double the continuous output, a higher surge peak, more solar input and an expansion port. Per lifetime kWh the two cost about the same, $0.15 against $0.15. The RIVER 2 Pro makes sense if its 17.2 lb weight decides how you will carry it.
Is the RIVER 2 Pro loud when charging?
It can be. EcoFlow says it may reach up to 62 dB when charging or discharging at high wattage, and one owner modded the unit to quiet it. EcoFlow's 30 dB figure for the DELTA 3 is a best case, so the two numbers are not directly comparable. At light loads the DELTA 3's fans often stay off.
Can either of these run a CPAP machine overnight?
Both can. A CPAP night draws around 320Wh, which is 37% of the DELTA 3's usable capacity and 49% of the RIVER 2 Pro's. Both leave a comfortable margin. The published noise figures are measured differently, so pick on weight and the rest of your list.
Does the RIVER 2 Pro support battery expansion?
No. The RIVER 2 Pro is sealed at 768Wh, so outgrowing it means buying another unit. The DELTA 3 supports EcoFlow expansion batteries.
Related comparisons
Where to buy
EcoFlow DELTA 3Pick
$599.00
$599.00 Β· direct from EcoFlow
down from $629 Β· 5% below usual
Last checked 28 days ago. Prices move β check before you buy.
EcoFlow RIVER 2 Pro
$389.00
$389.00 Β· direct from EcoFlow
Last checked 28 days ago. Prices move β check before you buy.
Prices may vary by retailer and are subject to change.