Head-to-head test
EcoFlow DELTA 3 Classic vs EcoFlow RIVER 2 Pro
EcoFlow now charges $469 for the DELTA 3 Classic against $349 for the RIVER 2 Pro — $120 more for a unit that outputs more than double the power, takes an expansion battery the RIVER 2 Pro can't, and runs at 30dB against the RIVER 2 Pro's 62dB under load.
Written by Ian SchneiderUpdated
Solar & Off-Grid Tester, Station Arena Test Desk
EcoFlow
DELTA 3 Classic
3,341Power Score · Appliance Class
$469.00 list · direct from EcoFlow
EcoFlow
RIVER 2 Pro
2,481Power Score · Appliance Class
$349.00 list · direct from EcoFlow
Spec deltas
The RIVER 2 Pro costs $349. The DELTA 3 Classic costs $469 — $120 more, from the same company. That premium doesn't buy a better price per lifetime kWh: run both units through their full rated cycle life and they land at the same $0.15 per kWh delivered.
What it buys instead is capacity and headroom. The DELTA 3 Classic holds 1,024Wh against the RIVER 2 Pro's 768Wh, outputs 1,800W continuously against 800W, and takes more than double the solar input — 500W against 220W. It also runs at 30dB against the RIVER 2 Pro's 62dB under load, and it's the only one of the two that takes an expansion battery.
The RIVER 2 Pro's case used to rest on weight alone — 17.2 lbs against the DELTA 3 Classic's 26.7 lbs, a 9.5 lb gap. Now it's also the cheaper unit by $120. For anyone whose loads don't need the DELTA 3 Classic's extra output, that's no longer a consolation prize.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
cost / lifetime kWh
That premium is buying capacity, not offsetting a bad price: the DELTA 3 Classic delivers 3,072kWh over its lifetime against the RIVER 2 Pro's 2,304kWh, a 768kWh difference (3,072 minus 2,304), at the same cost per kWh either way.
The DELTA 3 Classic costs $469 against the RIVER 2 Pro's $349 — a $120 gapBoth units compute to $0.15 per lifetime kWh (p1CostPerLifetimeKwh and p2CostPerLifetimeKwh)
Why it mattersAnyone comparing these on which is the smarter dollar should drop that framing. Dollar-for-dollar they're identical now, so the real question is whether you need the extra 768kWh and the output that comes with it.
continuous output
One review confirmed the DELTA 3 Classic's 1,800W inverter handles the startup surge of a small window AC unit, even though runtime at that load is shortA10. The RIVER 2 Pro's spec sheet rules that appliance class out entirely, not just for the long haul but at the moment of switch-on.
The DELTA 3 Classic outputs 1,800W continuous with a 3,600W surge ceilingThe RIVER 2 Pro outputs 800W continuous with a 1,600W surge ceiling
Why it mattersIf a window AC, a space heater, or corded power tools are anywhere on the list, the RIVER 2 Pro's price doesn't matter. It can't do the job.
EcoFlow's own spec documentation acknowledges the RIVER 2 line can hit 62dB during heavy charging or dischargingB2, and one RIVER 2 Pro owner found it loud enough to open the case and mod in quieter fansB1. At 30dB, the DELTA 3 Classic is the one you can sleep an arm's length from without planning around it.
The DELTA 3 Classic measures 30dB; the RIVER 2 Pro hits 62dB under loadThe CPAP Overnight scenario needs 320Wh — both units clear it easily, using 37% of usable capacity for the DELTA 3 Classic and 49% for the RIVER 2 Pro
Why it mattersCPAP buyers should pay the $120. The scenario math already resolves this way, and it has nothing to do with capacity.
weight
That combination didn't exist before. A lighter unit that costs more only wins for buyers who value weight above money. A lighter unit that also costs $120 less wins for anyone whose loads fit inside 768Wh and 800W, no asterisk required.
The RIVER 2 Pro costs $120 less than the DELTA 3 ClassicThe RIVER 2 Pro weighs 17.2 lbs against the DELTA 3 Classic's 26.7 lbs — 9.5 lbs lighter
Why it mattersBuyers who don't need the DELTA 3 Classic's extra output or capacity should stop treating the RIVER 2 Pro as the compromise pick. At these prices it's just the right-sized one.
The specific dimensions that decide these two units — everything else is a tie.
Lifetime Value
Selected because: Price flipped $120 against the DELTA 3 Classic, but cost per lifetime kWh ties at $0.15 — the central reframe for this rewrite.
cost / lifetime kWh
The RIVER 2 Pro is $120 cheaper, but that gap doesn't survive contact with the numbers underneath it. Run each unit through its full rated cycle life and they land at the same $0.15 per lifetime kWh — the DELTA 3 Classic's 3,072kWh of total lifetime delivery against the RIVER 2 Pro's 2,304kWh costs the same per unit of energy either way.
What that means in practice: the DELTA 3 Classic's $120 premium isn't inefficiency you're paying for. It's 768kWh of extra lifetime delivery (3,072 minus 2,304) and everything the larger battery brings with it — more output, more solar input, a growth path. Judge the price gap on capability, not on which unit is the better deal, because neither one is.
What the Specs Don't Tell You
Selected because: Four cards fire (noise, expansion, ups, warranty); noise and expansion still favor p1, warranty now favors p2 given the new prices.
Two of the four cards here are unchanged by the price move. Noise still points at the RIVER 2 Pro — 62dB under load against the DELTA 3 Classic's 30dB — and its UPS switchover is three times slower, 30ms basic standby against the DELTA 3 Classic's 10ms line-interactive. Expansion is unchanged too: the RIVER 2 Pro is sealed at 768Wh for life, while the DELTA 3 Classic can add capacity later.
Warranty is the honest reversal. Both units carry 5-year coverage, but at current prices that works out to $94 a year for the DELTA 3 Classic against $70 a year for the RIVER 2 Pro. The RIVER 2 Pro is now the cheaper warranty too, not just the cheaper sticker price.
Your Life, Your Pick
Selected because: CPAP Overnight and Tailgate Party both resolve to the DELTA 3 Classic; the bigger-load scenarios still favor neither unit.
The DELTA 3 Classic wins two of the six scenarios outright. CPAP Overnight goes to it on noise alone — both units have capacity to spare, but only one is quiet enough to sleep next to. Tailgate Party goes to it on margin: the RIVER 2 Pro needs 103% of its usable capacity against the DELTA 3 Classic's 77%, so the RIVER 2 Pro comes up short and the DELTA 3 Classic doesn't.
The other four go to neither unit. Weekend Camping needs 2,100Wh and Van Life Daily needs 4,685Wh — both units fall far short of either on their own, DELTA 3 Classic included. Buying based on those two scenarios means planning for an expansion battery or a larger unit outright, not picking between these two.
Portability & Form Factor
Selected because: The RIVER 2 Pro's 9.5 lb weight edge now stacks with a $120 price edge for the first time — worth its own section.
weight
The RIVER 2 Pro weighs 17.2 lbs against the DELTA 3 Classic's 26.7 lbs, a 9.5 lb gap that used to be its only advantage. At current prices it isn't alone anymore — the RIVER 2 Pro is also $120 cheaper, so weight and price now argue the same direction for the first time.
If you're carrying this any real distance — a hike in, a boat, no trunk to slide it into — that combination is hard to argue with. If you're mostly lifting it from a garage shelf into a car once, the 9.5 lbs buys you less than the DELTA 3 Classic's extra capacity and output would.
Strengths & trade-offs
EcoFlow DELTA 3 Classic
Strengths
- +Larger battery capacity
- +Higher AC output
- +Faster solar charging
Trade-offs
- –Substantially more expensive (+$120) than the RIVER 2 Pro.
EcoFlow RIVER 2 Pro
Strengths
- +Costs $120 less
- +Lighter by 9.5 lb
Trade-offs
- –Weaker inverter (-1,000W) limits appliance compatibility.
- –Can receive complaints about fan noise under heavy load.
- –Sealed capacity — the DELTA 3 Classic can add batteries to grow past 768Wh; this one can't.
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 · 2 nights · needs 2,100Wh
Weekend Camping
Two nights off-grid with essential comfort
Neither unit
Neither unit covers a full weekend camping trip on its own — this load runs to 2,100Wh, well beyond what either unit's usable capacity can deliver. The DELTA 3 Classic gets closer, needing 241% of its usable capacity against the RIVER 2 Pro's 322%, but closer isn't enough. Plan on an expansion battery or a bigger unit if this is the real use case.
Battery budget usedlower = more headroom
LOAD Phone Charger 15W×6h · LED Lights 40W×8h · Box Fan 75W×14h · CPAP Machine 40W×16h
SCN-02 · 8 hours · needs 1,645Wh
8-Hour Blackout
Keep the essentials running through a night without power
Neither unit
Neither unit can fully handle this scenario (needs 1,645Wh). You'd need a higher-capacity station or to cut back on usage.
Battery budget usedlower = more headroom
LOAD Fridge 150W×8h · Router + Modem 20W×8h · LED Lights (4 bulbs) 40W×6h · Phone Charger 15W×3h
SCN-03 · 8 hours · needs 320Wh
CPAP Overnight
Sleep therapy without interruption — the #1 medical use case
DELTA 3 Classic
Both units handle an overnight CPAP load with room to spare — the DELTA 3 Classic uses 37% of its usable capacity, the RIVER 2 Pro 49%. Capacity was never the question here; noise is. At 30dB against 62dB, the DELTA 3 Classic is the one you can sleep next to without thinking about it.
Battery budget usedlower = more headroom
LOAD CPAP Machine 40W×8h
SCN-04 · 8 hours · needs 910Wh
Remote Workday
Full work day off-grid without power anxiety
Neither unit
Neither unit can fully handle this scenario (needs 910Wh). You'd need a higher-capacity station or to cut back on usage.
Battery budget usedlower = more headroom
LOAD Laptop 60W×8h · External Monitor 30W×8h · Router + Modem 20W×8h · Phone Charger 15W×2h
SCN-05 · 4 hours · needs 670Wh
Tailgate Party
Game day power for the crew
DELTA 3 Classic
The DELTA 3 Classic covers a tailgate's power draw using 77% of its usable capacity. The RIVER 2 Pro needs 103% — just over what it has to give. That's the whole scenario: one unit has margin, the other runs out.
Battery budget usedlower = more headroom
LOAD Blender 400W×0.5h · LED TV (55") 80W×4h · Bluetooth Speaker 15W×4h · Phone Charger (×3) 45W×2h
SCN-06 · 24 hours · needs 4,685Wh
Van Life Daily
A full day of mobile living — the ultimate endurance test
Neither unit
Neither unit can fully handle this scenario (needs 4,685Wh). You'd need a higher-capacity station or to cut back on usage.
Battery budget usedlower = more headroom
LOAD Mini-Fridge 150W×24h · Laptop 60W×4h · Phone Charger 15W×3h · LED Lights 40W×5h · Fan 75W×8h
The Load Test
RUNTIME = (Wh × 0.85) ÷ LOAD
None of the six 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 Classic runs 4.2h vs 3.2h.
$469 list · direct from EcoFlow
Modeled from the spec record — same math as the tables below. Methodology
Runtime by appliance
Real-world runtime estimates for common appliances, modeled at 85% inverter efficiency.¹
Essentials
The basics you need runningscale 0–58hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–11.6hHigh-Draw Appliances
These reveal the real limitsscale 0–0.9h¹ Runtime = (capacity × 0.85) ÷ 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 — see methodology.
Conclusion
July 26, 2026
Verdict: the DELTA 3 Classic, on Power Score margin
The DELTA 3 Classic costs $120 more than the RIVER 2 Pro now — $469 against $349 — but that gap buys real capability: 256Wh more capacity (1,024Wh against 768Wh), more than double the continuous output (1,800W against 800W) and solar input (500W against 220W), a quieter 30dB rating against 62dB, and an expansion path the RIVER 2 Pro doesn't have. Cost per lifetime kWh ties at $0.15 either way, so the premium isn't paying for inefficiency, it's paying for headroom. Buyers running real appliances, sleeping near the unit overnight, or planning to grow into more power should pay it. Buyers whose loads stay under 768Wh and 800W should keep the $120 and take the RIVER 2 Pro instead — at that price and 9.5 lbs lighter, it doesn't need an asterisk anymore.
Editor-assigned confidence, based on cited owner research and spec analysis.
List prices as of July 26, 2026. The links below open EcoFlow's current price.
$469.00 list · direct from EcoFlow
or check the RIVER 2 Pro price$349.00 list
Written by Ian Schneider, Solar & Off-Grid Tester · Station Arena Test Desk · Updated July 26, 2026
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
ᵈ Derived: price ÷ rated capacity. See the data behind our comparisons →
Comparison ToolAdd more power stations, side by sideOpen Tool →How these numbers are produced
Numeric verification
Every figure on this page traces to our spec database or arithmetic on it — no estimated numbers.
Owner claims
Statements about owner experience are cited to published reviews — see Sources & Research Notes below.
Runtime model
Runtime = (rated capacity × 0.85 inverter efficiency) ÷ 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 →Class ranking (the star rating)
Each unit's star score is a category ranking, not customer reviews — 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 5★. Here, DELTA 3 Classic rates 4.9/5 (91st percentile of 24 Everyday-class units), and RIVER 2 Pro rates 4.5/5 (72nd percentile of 19 Compact-class units).
How the class ranking is computed →Test Notes & Caveats
Hidden gotchas and advantages we spotted that you won't find on the product page.
62dB Against 30dB
The RIVER 2 Pro hits 62dB under heavy charging or discharging; the DELTA 3 Classic runs at 30dB. That's a spec gap, not a price gap — it holds regardless of which unit costs less.
One Sealed System, One That Grows
The RIVER 2 Pro can't take an expansion battery at any point — 768Wh is a hard ceiling. The DELTA 3 Classic can add capacity later without replacing the base unit, which matters most if your power needs are still climbing.
10ms Against 30ms
The DELTA 3 Classic switches over in 10ms, line-interactive. The RIVER 2 Pro's basic standby switchover takes 30ms, three times longer. For anything that can't tolerate even a brief drop, that gap matters more than the price tag.
The Cheaper Unit Is Also the Cheaper Warranty
Both units carry 5-year warranties, but at current prices that's $94 a year for the DELTA 3 Classic against $70 a year for the RIVER 2 Pro. The RIVER 2 Pro is the better warranty deal now, not just the lower sticker price.
Full record above — the Test Desk pick is the DELTA 3 Classic.
Check DELTA 3 Classic price →or check the RIVER 2 Pro priceOwnership Analysis
What happens after you buy — 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
│ warranty ends · Reaching the cycle rating means ~80% capacity remains — degraded, not dead.
Analyst note
The RIVER 2 Pro is cheaper to buy, but the DELTA 3 Classic is cheaper to own. At $0.15/kWh over its lifetime vs $0.15/kWh, the DELTA 3 Classic's higher cycle life and capacity make each dollar go further over the years.
Growth path
DELTA 3 Classic
EXPANDABLESupports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit — 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 — 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 — see methodology
Analyst note
The RIVER 2 Pro is sealed at 768Wh, which is fine if that covers you. The DELTA 3 Classic starts at 1,024Wh and can grow beyond it with EcoFlow expansion batteries — real headroom the RIVER 2 Pro doesn't have if your needs climb toward partial-home backup.
What Owners Report
Patterns from published owner reports and long-term reviews — every claim cited to its source below.
EcoFlow DELTA 3 Classic
The DELTA 3 Classic only launched in March 2026, so this is an early-adopter snapshot, not months of ownership data — most of what exists is hands-on testing from review outlets rather than long-running owner threads. One outlet clocked a full wall-outlet recharge from empty in just shy of 55 minutesA1 and measured idle draw at roughly 17W per hourA2, both called better than expected for the price, with the same reviewer surprised the fans stayed quiet at that price tierA3. Another reviewer noted it felt noticeably lighter than the DELTA 2 it was replacing in a motorhomeA8.
The honest catch is the solar ceiling: more than one outlet flags the 500W solar input cap as low for a 2026-era releaseA5A9, with one buyer report showing the screen topping out at 500W input against higher expectationsA5. The companion app draws separate praise as one of the best-designed in the categoryA6, and the Storm Guard auto-charge feature is called out as genuinely useful rather than a checkbox featureA12. One retailer review thread mixes in complaints that appear to reference the unrelated DELTA 2 rather than this unit — excluded here as unreliable.
“In our tests, the DELTA 3 Classic charged from empty to full plugged into a standard wall outlet in just shy of 55 minutes.”
Sources
thesolarlab.com · vantour.net · smartenergyedge.com · walmart.com
EcoFlow RIVER 2 Pro
Owner commentary specific to the RIVER 2 Pro, as opposed to the base RIVER 2 or RIVER 2 Max, is thin — this ledger runs to four entries. The dominant thread is fan noise: EcoFlow's own spec footnotes confirm the RIVER 2 series can hit 62dB during high-wattage charging or dischargingB2, and one owner documented modding the unit's internals with quieter fans, noting the fix required cutting into internal plasticB1.
A forum post asked whether running the RIVER 2 Pro as a UPS shortens its battery lifeB3 — an open question this ledger can't resolve. One CPAP user living in a van reported running similar gear off solar-charged battery storage without issue overnightB4, though that report doesn't isolate RIVER 2 Pro fan behavior at the light, steady draw a CPAP actually pulls.
“Will using River 2 Pro as a UPS affect battery life ...”
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
- Multiple independent reviewers note the unit is quieter than expected for its price point, with low idle drain. [DELTA 3 Classic · 2 entries]
- The 500W solar input cap is flagged as a limiting factor by more than one review outlet, seen as low for a 2026-era release. [DELTA 3 Classic · 2 entries]
- Reviewers praise the app and Storm Guard/smart features as standout software elements. [DELTA 3 Classic · 2 entries]
- 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 · 2 entries]
- A1
“In our tests, the DELTA 3 Classic charged from empty to full plugged into a standard wall outlet in just shy of 55 minutes.”
thesolarlab.com — EcoFlow DELTA 3 Classic Review: Cheap, Quiet & Useful? · unknown (post-launch 2026) · [positive]
- A2
“We measured the idle draw to be roughly 17W per hour.”
thesolarlab.com — EcoFlow DELTA 3 Classic Review: Cheap, Quiet & Useful? · unknown (post-launch 2026) · [positive]
- A3
“we expected the cooling fans to break that trend given the price point for this unit”
thesolarlab.com — EcoFlow DELTA 3 Classic Review: Cheap, Quiet & Useful? · unknown (post-launch 2026) · [positive]
- A5
“the screen only showed 500 W input”
vantour.net — EcoFlow Delta 3 Classic: Our review, test and promo code · 3 weeks ago (~June 2026) · [negative]
- A6
“it is clearly one of the best-designed apps on the market”
vantour.net — EcoFlow Delta 3 Classic: Our review, test and promo code · 3 weeks ago (~June 2026) · [positive]
- A8
“It also seems noticeably lighter than the EcoFlow DELTA 2 that we currently have in the motorhome.”
vantour.net — EcoFlow Delta 3 Classic: Our review, test and promo code · 3 weeks ago (~June 2026) · [positive]
- A9
“EcoFlow pushes the fast charging hard, but the DELTA 3 Classic is capped at 500W solar input”
smartenergyedge.com — EcoFlow DELTA 3 Classic Review: Better Than the DELTA 2? · 1 week ago (~July 2026) · [negative]
- A10
“The 1,800W inverter handles the startup surge of a small window AC unit just fine, but the runtime is short.”
smartenergyedge.com — EcoFlow DELTA 3 Classic Review: Better Than the DELTA 2? · 1 week ago (~July 2026) · [mixed]
- A12
“The Storm Guard auto-charge feature is smart and genuinely useful.”
smartenergyedge.com — EcoFlow DELTA 3 Classic Review: Better Than the DELTA 2? · 1 week ago (~July 2026) · [positive]
- B1
“I'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.”
ctrl-alt-rees.com blog — 'EcoFlow RIVER 2 Noisy Fan Fix!' · 2022-11-17 · [negative]
- B2
“When charging and discharging at high wattage, RIVER 2 Max and RIVER 2 Pro may make a noise up to 62db.”
EcoFlow official product page — RIVER 2 Series specs/FAQ footnotes · unknown · [negative]
- B3
“Will using River 2 Pro as a UPS affect battery life ...”
Facebook — EcoFlow Club group post title · unknown · [mixed]
- B4
“I'm very new to CPAP (1 week) and I live in a van. I have solar and a decent battery bank and I've got the ResMed DC-DC cable which powers my AirSense 11 AutoSet overnight no problem.”
Apnea Board forum — '[Equipment] EcoFlow River 2 Pro' thread · 2025-07 · [mixed]
Research compiled July 26, 2026.
Who Should Buy Which
Buy the DELTA 3 Classic if you…
- →Your loads include real appliances — a window AC, a space heater, corded power tools — where the RIVER 2 Pro's 800W continuous rating and 1,600W surge ceiling won't even start them.
- →You're running a CPAP or anything else within arm's reach overnight, where the DELTA 3 Classic's 30dB against the RIVER 2 Pro's 62dB is the whole decision.
- →You want room to grow: the DELTA 3 Classic takes EcoFlow's expansion batteries, and the RIVER 2 Pro doesn't take any.
Buy the RIVER 2 Pro if you…
- →Your loads fit comfortably under 768Wh and 800W — phones, laptops, lights, a fan — and you'd rather keep the $120.
- →You're carrying this a real distance regularly. 9.5 lbs less weight, now paired with a lower price, is no longer a compromise.
If neither fits
Weekend Camping (2,100Wh needed) and Van Life Daily (4,685Wh needed) are out of reach for both units on their own — the DELTA 3 Classic gets closer but still falls well short. If that's the real use case, look at the DELTA 3 Classic with an expansion battery attached, or a larger unit outright.
The Bottom Line
EcoFlow used to sell the cheaper of these two units for less money. That's no longer true: the RIVER 2 Pro costs $120 less now, and the DELTA 3 Classic's premium buys more than double the continuous output, more than double the solar input, and a noise rating that's the difference between sleeping through the night and not.
Take the DELTA 3 Classic if any real appliance, overnight quiet, or future growth is on your list. The RIVER 2 Pro's spec sheet rules all three out. Take the RIVER 2 Pro if your loads are lighter than that. At $349 and 17.2 lbs, it's finally the obvious pick, not the consolation one.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Which is cheaper, the EcoFlow DELTA 3 Classic or the RIVER 2 Pro?
The RIVER 2 Pro, at $349 against the DELTA 3 Classic's $469 — a $120 gap. Run the numbers over each unit's lifetime, though, and they land at the same $0.15 per lifetime kWh, so the price difference buys capacity and output, not a better deal.
Is the DELTA 3 Classic worth $120 more than the RIVER 2 Pro?
If your loads include real appliances, need overnight quiet, or might grow, yes — it outputs more than double the continuous power, runs at 30dB against 62dB, and takes expansion batteries the RIVER 2 Pro can't. If your loads stay under 768Wh and 800W, the RIVER 2 Pro now costs less and weighs 9.5 lbs less, with nothing given up that you'd actually use.
Which EcoFlow unit is quieter?
The DELTA 3 Classic, measured at 30dB against the RIVER 2 Pro's 62dB under load — a figure EcoFlow's own documentation confirms, and one owner found it loud enough to mod the fans.
Can the RIVER 2 Pro be expanded with an extra battery?
No. It's a sealed, closed system, so whatever capacity you buy at 768Wh is what you'll have for the unit's life. The DELTA 3 Classic supports EcoFlow's own expansion batteries, so its capacity can grow later instead of requiring a second unit.
Which one should I buy for a CPAP machine?
The DELTA 3 Classic. Both units clear an overnight CPAP load easily, using well under half their usable capacity, but the DELTA 3 Classic's 30dB rating against the RIVER 2 Pro's 62dB is the deciding fact when the unit sits an arm's length from your bed.
Where to buy
EcoFlow DELTA 3 ClassicPick
$469.00
$469.00 list · direct from EcoFlow
EcoFlow RIVER 2 Pro
$349.00
$349.00 list · direct from EcoFlow
Prices may vary by retailer and are subject to change.