Head-to-head test
EcoFlow DELTA 3 1500 vs EcoFlow RIVER 2 Pro
EcoFlow DELTA 3 1500 vs EcoFlow RIVER 2 Pro: the 1500 is discontinued, so the RIVER 2 Pro is the only one still buyable, at 768Wh and an 800W inverter in 17.2 lb against 1,536Wh and 1,800W. Take it only if your loads fit the smaller battery; if you needed the 1500's capacity, the live answer is the DELTA 3 Max.
Full profiles: EcoFlow DELTA 3 1500 β Β· EcoFlow RIVER 2 Pro β
Written by Ian SchneiderUpdated
Solar & Off-Grid Tester, Station Arena Test Desk
Spec deltas
EcoFlow has folded the DELTA 3 1500 out of its range. Its product page forwards to the base DELTA 3, the last listing standing is a sold-out solar bundle, and nothing EcoFlow sells today sits where the 1500 sat. So half of this comparison is a unit you can read about and cannot order, and the RIVER 2 Pro wins by walkover before a single spec gets compared.
That makes the page more useful than it sounds, because almost nobody lands here genuinely torn between these two. A 1,536Wh box and a 768Wh box are not rivals. They are two marks on a ruler, and if you are reading this you are probably still working out which mark you need. Use the sections below to find your own loads on that ruler rather than to pick a side.
The short version: the RIVER 2 Pro is a genuinely good small station. 768Wh, 800W, 17.2 lb, five years of cover, and it clears a CPAP night with most of the battery untouched. It is also sealed at that size for life, and it falls short of the remote-workday profile the DELTA 3 1500 covered. If that profile is your week, the unit to go look at is the DELTA 3 Max. Buying the RIVER 2 Pro because it is the one left in stock is how people end up with a battery that quits before the workday does.
What the Numbers Reveal
Each conclusion stated first β the numbers behind it on one line, the full analysis below.
The DELTA 3 1500 covered that same profile with 396Wh in hand, and that coverage left the range along with the unit. So a buyer whose week looks like the workday profile is not really choosing between these two boxes at all. They are choosing between the RIVER 2 Pro and the DELTA 3 Max, and only one of those two is big enough.
RIVER 2 Pro: 768Wh nameplate, 653Wh usable after the flat 15% conversion allowance this site applies to every unitThe Remote Workday profile needs 910Wh, leaving the RIVER 2 Pro 257Wh shortThe RIVER 2 Pro is sealed: no expansion battery, no swappable pack
Why it mattersIf you work off the battery all day, skip both units on this page and go price the DELTA 3 Max.
solar input
That kills the usual workaround. Going small and topping up from a panel only helps if the panel buys back a meaningful slice of the weekend, and on the 2,100Wh camping profile the RIVER 2 Pro starts at under a third of the list and gains no proportional speed on the refill. Sun does not turn 768Wh into 1,536Wh. It turns it into 768Wh again, tomorrow.
RIVER 2 Pro accepts 220W of solar into 768Wh of capacityDELTA 3 1500 accepts 500W of solar into 1,536Wh of capacityWeekend Camping needs 2,100Wh: the RIVER 2 Pro covers 31% of it, the DELTA 3 1500 covers 62%
Why it mattersCampers planning to close a capacity gap with solar should close it with capacity instead.
Which moves the real risk from the battery to the timing. That noise figure is a load figure, so the surest way to get a loud night out of this unit is to recharge it while you sleep. The DELTA 3 1500 publishes no figure at all, so it cannot be compared here on anything better than a guess, and with the unit out of the range it is a guess you can no longer settle by going and listening to one.
CPAP Overnight needs 320Wh, which is about 40W for eight hoursRIVER 2 Pro: 653Wh usable, so about 16 hours at 40W, with 333Wh still in hand at sunriseThe RIVER 2 Pro's 62dB is published as a maximum reached when charging or discharging at high wattage, not as a bedside reading
Why it mattersCPAP buyers take the RIVER 2 Pro and charge it during the day.
The specific dimensions that decide these two units β everything else is a tie.
Your Life, Your Pick
Selected because: The DELTA 3 1500 finishes three of these six load profiles and the RIVER 2 Pro one, so the real question is which of them is your week.
Read down the six profiles and you get a ruler, not a scoreboard. The DELTA 3 1500 finishes three, the RIVER 2 Pro finishes one, and the two never actually disagree about anything. They stop at different points on the same list.
Every row that separates them is a capacity row. Both units start every peak in the set, up to the tailgate's 400W, so nothing here turns on what they can run, only on how long they keep running it. And three of the six beat both units outright, including the 4,685Wh van-life profile, which is a different category of purchase rather than an argument between these two.
Runtime: Will It Power Your Gear?
Selected because: 768Wh against 1,536Wh is the entire argument, and runtime is where you see what that costs at your own loads.
continuous output
An eight-hour outage asks for 1,645Wh, and the RIVER 2 Pro brings 653Wh of it. That is 40% of the profile, or a bit over three hours of the eight, so the lights go back off well before the utility comes back on. The DELTA 3 1500 covers 79%, which gets you to roughly six and a half hours and is still not the whole night.
Neither is a blackout unit, then, and the DELTA 3 1500's advantage is that it fails later. What the RIVER 2 Pro is good at is the load you can name out loud: one laptop, one phone, a string of lights, a fan. Read the hours against the thing you actually plug in, and if its column is long enough, you are finished here and carrying a lot less.
Growth Path
Selected because: The RIVER 2 Pro is sealed at 768Wh, so whatever you buy is its ceiling for the life of the unit.
solar input
The RIVER 2 Pro's upgrade path is a second purchase. It takes no expansion battery and no swappable pack, so 768Wh is not where it starts. It is where it finishes, for the whole life of the unit. That is a fair trade at this size, and it is the one thing to be certain about before you buy, because there is no fixing it afterwards.
The DELTA 3 1500 did take expansion batteries, and that is now a feature on paper only. An upgrade path you cannot buy into is not a path. If you can see your loads climbing past 768Wh, the move is to buy the capacity up front instead of buying the option, and the live EcoFlow nearest to what the 1500 covered is the DELTA 3 Max.
Portability & Form Factor
Selected because: 17.2 lb against 36 lb is the one comparison the live unit wins outright and on merit.
weight
17.2 lb is a one-handed carry with a cooler in the other hand. 36 lb is the one you set down to open the door. That is 18.8 lb of difference, and it is the RIVER 2 Pro's whole case made without mentioning the battery once.
It is also why the size question has a floor as well as a ceiling. Every watt-hour you add is weight you carry, and the buyer who sizes up just in case is the buyer who leaves the thing in the garage. Buy the smallest unit that finishes your list, and be honest with yourself about the list.
What the Specs Don't Tell You
Selected because: The only published noise figure here is the RIVER 2 Pro's 62dB, and it is a maximum under load rather than a bedside reading.
One noise figure exists on this page and it belongs to the RIVER 2 Pro: 62dB, published as a maximum under heavy charge or discharge rather than the best case most makers print. The DELTA 3 1500 publishes nothing, which is not the same as being quiet. It is an absence, and with the unit out of the range it is an absence nobody is going to fill.
The transfer-speed cards tell the same story about what is actually available to you. The DELTA 3 1500 is rated at no worse than 15ms and the RIVER 2 Pro at no worse than 30ms, both of them rated ceilings rather than measurements, and the faster class is the one you cannot order. If a desktop with unsaved work is what you are protecting, plan around the 30ms class rather than hoping it behaves like the 15ms one.
Strengths & trade-offs
EcoFlow DELTA 3 1500
Strengths
- +Larger battery capacity
- +Higher AC output
- +Faster solar charging
Trade-offs
- βSignificantly heavier (+18.8 lbs), making it harder to move.
EcoFlow RIVER 2 Pro
Strengths
- +Lighter by 18.8 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 1500 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 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 1500 comes up 794Wh short (about 62% 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 finishes the outage. The DELTA 3 1500 covers about four fifths of the 1,645Wh this profile asks for and the RIVER 2 Pro about two fifths, so the question is not whether you run out but when. Both hold the 150W peak without strain, which means the rationing here is about hours rather than about what you are allowed to plug in.
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
Both cover the night, and not narrowly: 320Wh against 653Wh and 1,306Wh usable, so capacity decides nothing. What decides it is the part no spec sheet settles. The RIVER 2 Pro's published noise figure is a high-load maximum and a 40W CPAP is nowhere near high load, while the DELTA 3 1500 publishes no figure at all. The live unit is also the one that weighs 17.2 lb and moves from bedroom to car without a second thought.
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
DELTA 3 1500
The DELTA 3 1500 takes this row, and it is the row that explains the whole page. 910Wh of work against 653Wh usable leaves the RIVER 2 Pro 257Wh short, roughly three quarters of the way through the day, while the DELTA 3 1500 finishes with 396Wh spare. If this is your week, the honest answer is not on this page: it is the DELTA 3 Max.
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 1500
The RIVER 2 Pro misses this by 17Wh, the smallest and least meaningful gap on the page. Its 768Wh nameplate clears the 670Wh the profile needs; it is the flat 15% conversion allowance that tips it under. Leave one thing unplugged and it finishes. Both units start the 400W peak without complaint, so the DELTA 3 1500's win here is a technicality rather than a capability.
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 1500 comes up 3,379Wh short (about 28% 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 1500 runs 6.4h vs 3.2h.
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 0β87hComfort & Convenience
Makes off-grid life actually enjoyablescale 0β17.4hHigh-Draw Appliances
These reveal the real limitsscale 0β1.3hΒΉ 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
September 19, 2026
Verdict: the EcoFlow RIVER 2 Pro
The RIVER 2 Pro wins because it is the only one of the two you can buy: EcoFlow has folded the DELTA 3 1500 out of its range. That is not an asterisk on a close call. At 768Wh and 800W the RIVER 2 Pro is half the battery and well under half the inverter, and it finishes one of the six load profiles on this page against the DELTA 3 1500's three. Buy it if your real list is a laptop, a phone, lights, a fan and a CPAP, where 653Wh of usable energy is genuinely plenty and 17.2 lb in one hand is the whole point. If your list is the one that needed 1,536Wh, the RIVER 2 Pro is not a smaller version of the answer, it is a different answer, and the DELTA 3 Max is the nearest live EcoFlow to what the 1500 covered.
Editor-assigned confidence, based on cited owner research and spec analysis.
List prices as of September 19, 2026. The links below open EcoFlow's current price.
$349.00 Β· direct from EcoFlow
Last checked 16 days ago. Prices move β check before you buy.
Written by Ian Schneider, Solar & Off-Grid Tester Β· Station Arena Test Desk Β· Updated September 19, 2026
Black Friday Β· 38 days out
Price to beat:RIVER 2 Pro $349
We have never seen it discounted, so any real cut 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 1500 rates 5.0/5 (99th percentile of 27 Everyday-class units), and RIVER 2 Pro rates 4.6/5 (79th 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, and When You Would Hear It
62dB is conversation volume, and EcoFlow publishes it the unusual way round. Most makers print a best-case floor; EcoFlow states this as the maximum the RIVER series may reach when charging or discharging at high wattage. So it is the top of the range rather than the bottom, and a light load sits well under it. In practice: a 40W CPAP will not provoke it, and plugging the unit in to recharge beside your bed will. Charge it during the day and the number mostly stops mattering.
RIVER 2 Pro: 768Wh Is the Ceiling, Permanently
Our pick is the one that cannot grow, and that deserves saying plainly rather than in a footnote. The RIVER 2 Pro takes no expansion battery and no swappable pack, so whatever it does not cover on the day you buy it, it will not cover in year five either. The DELTA 3 1500 did take expansion batteries, which is now an upgrade path with nothing at the far end of it. If you think your loads are about to climb, buy the capacity rather than the option, and the DELTA 3 Max is the live EcoFlow nearest to what the 1500 covered.
UPS: 15ms vs 30ms, and Only One Is Buyable
Both units list a UPS mode, and both figures are rated ceilings rather than measurements. The DELTA 3 1500 is rated at no worse than 15ms, the better class, though the fussiest PC power supplies sit right at that line anyway. The RIVER 2 Pro is rated at no worse than 30ms, long enough that many desktops will drop rather than ride it out, so treat it as cover for a router, a modem or anything you can afford to reboot and do not hang unsaved work on it. The faster class here belongs to the unit you cannot order.
Warranty: Five Years Each, No Tiebreak
Both units carry the same five-year term, so coverage is not a reason to pick one over the other. The part worth thinking about is not the length but what stands behind it: a term on a unit its maker has stopped listing is only as good as the parts and the service still supporting that model, and that is a question for EcoFlow rather than a spec you can read off a page. On the unit still in the range, five years is simply five years.
DELTA 3 1500: No Published Noise Figure
EcoFlow never published a noise level for the DELTA 3 1500, and now that the unit has left the range, it is not going to. That is not evidence it runs loud. It is an absence, and an absence you cannot resolve by going to hear one in a shop. The usual advice is to hunt down hands-on reports before deciding; on a unit nobody is selling, the more useful version is to treat the silence as one more reason the live decision sits elsewhere.
Full record above β the Test Desk pick is the RIVER 2 Pro.
Check RIVER 2 Pro price βOwnership 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
The DELTA 3 1500 is no longer sold, so there is no price to work its cost per kWh from, and this comparison doesn't quote one. On what you can actually buy today, the RIVER 2 Pro works out at $0.15/kWh over its rated life. If you already own the DELTA 3 1500, the hardware comparison still holds: over its rated life the DELTA 3 1500 delivers about 4,608 kWh and the RIVER 2 Pro about 2,304 kWh. One thing to know reading the table: both carry the same 3,000-cycle rating, so the lifetime rows are sticker price and capacity in disguise β the wear horizon is identical and decides nothing here.
Growth path
DELTA 3 1500
EXPANDABLESupports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit β useful if your needs may climb past 1,536Wh.
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
Growth only counts if you can still buy in, and the DELTA 3 1500 is no longer sold (EcoFlow points owners to the DELTA 3 Max). That leaves the RIVER 2 Pro: it is sealed at 768Wh, so buy the size that covers you now. The DELTA 3 1500's expandability still matters if you already own one, but it isn't a reason to pick it over the RIVER 2 Pro.
What Owners Report
Patterns from published owner reports and long-term reviews β every claim cited to its source below.
EcoFlow DELTA 3 1500
Field evidence on this exact SKU is thin and largely secondhand. Our research turned up no Reddit, YouTube or Amazon material specific to the 1,536Wh 1500, and the forum threads that do discuss it were only reachable as indexed snippetsA0. What is there is not flattering. One poster described a neighbour going through three DELTA 3 1500 units in roughly eight monthsA1, and the broader read in that thread was that the DELTA 3 line drew more failure reports than the DELTA 2 before it, with one owner offering two trouble-free DELTA 2 units as the contrastA2.
The hardware story behind that is the interesting part. Posters characterised the 1500 as a DELTA 2 and DELTA 3 hybrid, carrying the older UPS-cutover electronics in a new case with what one called "larger grade B cells"A3, and pegged its cutover at 15ms against the sub-10ms figure they reported for the standard DELTA 3A5. Idle draw came up too, with figures argued back and forth and a firmware fix that may or may not have reached this variant. We cannot confirm which model that thread was actually describing, so take it as colour rather than a specA4.
βPosters described the Delta 3 1500 as essentially a Delta 2/Delta 3 hybrid β UPS-cutover electronics carried over from the Delta 2, housed in a new case with what one called "larger grade B cells."β
Sources
diysolarforum.com
EcoFlow RIVER 2 Pro
The RIVER 2 Pro's ledger is thin as well: only four entries could be confidently pinned to the Pro rather than the base RIVER 2 or the Max, because most discussion treats the line as one productB0. The one clear pattern is the fan. EcoFlow's own spec footnote is the source of the 62dB figure and states it as what the RIVER series may reach when charging or discharging at high wattageB2, and at least one owner cared enough to swap in a quieter fan, cutting away internal plastic to make it fitB1.
Beyond that it is questions rather than answers. Owners have asked whether running the Pro as a UPS shortens battery life, without a settled replyB3, and the one CPAP-specific thread we could source has a van-dwelling owner powering an AirSense 11 overnight from a DC-DC cable rather than through the inverterB4. That is a useful reminder: running a CPAP off the DC side skips the inverter, and the inverter is what the noise figure is about.
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
- Forum posters flagged the Delta 3 1500 as less reliable than EcoFlow's earlier Delta 2, both from direct failure reports and from its unusual hybrid Delta 2/Delta 3 hardware platform. [DELTA 3 1500 Β· 3 entries]
- Idle power draw and UPS cutover time are both discussed as possible regressions or open questions relative to the standard Delta 3 / Delta 3 Plus, without firm confirmation for the 1500 variant specifically. [DELTA 3 1500 Β· 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 Β· 2 entries]
- A1
βA poster's neighbor had three separate Delta 3 1500 units fail on him over roughly eight months.β
diysolarforum.com β "Ecoflow Delta 3 1500 (the newer one), refurbed from EF for $360pt, shipped free" Β· 2026-02 Β· [negative]
- A2
βForum consensus leaned toward the Delta 3 line seeing more failure reports than the Delta 2 β one poster said their two Delta 2 units never gave them a single issue by comparison.β
diysolarforum.com β "Ecoflow Delta 3 1500 (the newer one), refurbed from EF for $360pt, shipped free" Β· 2026-02 Β· [negative]
- A3
βPosters described the Delta 3 1500 as essentially a Delta 2/Delta 3 hybrid β UPS-cutover electronics carried over from the Delta 2, housed in a new case with what one called "larger grade B cells."β
diysolarforum.com β "Ecoflow Delta 3 1500 (the newer one), refurbed from EF for $360pt, shipped free" Β· 2026-02 Β· [mixed]
- A4
βIdle power draw for the Delta 3 line was debated β some cite roughly 25-30W, others said a firmware update cut it from about 40W to 17W β and posters weren't sure whether the 1500 specifically had received that fix.β
diysolarforum.com β "EcoFlow Delta 3 1500? Any user experiences" and "...refurbed from EF for $360pt" threads Β· 2026-02 to 2026-03 Β· [mixed]
- A5
βThe Delta 3 1500's UPS cutover was pegged at 15ms in forum discussion, versus a sub-10ms cutover reported for the standard Delta 3 and Delta 3 Plus.β
diysolarforum.com β "EcoFlow Delta 3 1500? Any user experiences" Β· 2026-03 Β· [mixed]
- 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]
- B4
βI'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.β
Apnea Board forum β '[Equipment] EcoFlow River 2 Pro' thread Β· 2025-07 Β· [mixed]
Research compiled September 19, 2026.
Who Should Buy Which
Buy the DELTA 3 1500 if youβ¦
- βYou already own one. Nothing on this page is a reason to replace it. 1,536Wh, 1,800W, a 3,600W surge ceiling and a 3,000-cycle pack are still the specs you bought, and the five-year term still runs.
- βYou have turned up surviving retailer or refurbished stock and your loads sit above what 653Wh covers. This is the unit that finishes the remote-workday profile the RIVER 2 Pro misses by 257Wh. Go in knowing EcoFlow has stopped listing it, and that the little field evidence we could find on this model leans negativeA1A2.
Buy the RIVER 2 Pro if youβ¦
- βYour real list is a laptop, a phone, lights and a fan, and you would rather carry 17.2 lb than plan for a day you do not actually have.
- βYou run a CPAP. 40W for eight hours is 320Wh against 653Wh usable, so the night is covered twice over. Charge it during the day and the fan figure stays theoretical.
- βYou want a first power station rather than a project: $349, five years of cover, a 3,000-cycle pack, and nothing to assemble, expand or plan around.
If neither fits
The van-life and weekend-camping profiles beat both units, leaving the RIVER 2 Pro 4,032Wh and 1,447Wh short respectively, and the answer there is a bigger station rather than a smaller decision. And if what brought you to this page was the DELTA 3 1500's size specifically, the live EcoFlow nearest to what it covered is the DELTA 3 Max. Go look at that instead of talking yourself into half the battery because the half is what is in stock.
The Bottom Line
Take the RIVER 2 Pro, with your eyes open about what you are taking. It is the only one of the two you can buy, it is the lighter unit by a wide margin, it clears a CPAP night twice over, and at five years and 3,000 cycles it is no compromise for the loads it does fit. It also stops at 768Wh for good and lands 257Wh short of the remote-workday profile, and no amount of sun fixes either of those.
So the question this page really answers is not which unit. It is which mark on the ruler. If your list fits inside 653Wh of usable energy, the RIVER 2 Pro is an easy purchase and you will be glad you did not carry the extra weight. If it does not fit, the RIVER 2 Pro is not a smaller answer, it is the wrong one, and the DELTA 3 Max is where to look next, because the unit that used to sit between them is not for sale any more.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Can you still buy the EcoFlow DELTA 3 1500?
No. EcoFlow has folded it out of the range: the product page forwards to the base DELTA 3, and the last listing standing is a solar bundle that is sold out. If you specifically wanted what the 1500 covered, the nearest unit EcoFlow still sells is the DELTA 3 Max. Retailer and refurbished stock does surface, but you are buying a model the maker has stopped listing.
Is the RIVER 2 Pro a replacement for the DELTA 3 1500?
No, and it is worth being blunt about it: 768Wh against 1,536Wh, and an 800W inverter against 1,800W. That is half the battery and well under half the inverter. The RIVER 2 Pro replaces the 1500 only for someone whose loads never needed the 1500 in the first place.
Will the EcoFlow RIVER 2 Pro run a CPAP all night?
Comfortably. A CPAP draws about 40W, so eight hours is 320Wh against the RIVER 2 Pro's 653Wh of usable energy, which is roughly two nights on a single charge. The thing to manage is not capacity but the fan: the 62dB EcoFlow publishes is a maximum for high-wattage charging and discharging, so do not recharge it on the nightstand.
Can you add a battery to the RIVER 2 Pro later?
No. It is sealed at 768Wh, with no expansion battery and no swappable pack, so the capacity you buy is the capacity you keep. Size it for the loads you have now, and if you can see them growing, buy a larger unit rather than planning to add on.
Is the RIVER 2 Pro good enough as a UPS for a desktop PC?
It is rated at no worse than 30ms transfer, which is a ceiling rather than a measured result, and a gap that long is one many desktop power supplies will not ride through. Treat it as protection for a router, a modem or a NAS you can afford to reboot, not for unsaved work. Owners have also asked whether running it as a UPS full time costs battery life, without a clear answer either way.
Where to buy
EcoFlow DELTA 3 1500
No longer sold
EcoFlow RIVER 2 ProPick
$349.00
$349.00 Β· direct from EcoFlow
Last checked 16 days ago. Prices move β check before you buy.
Prices may vary by retailer and are subject to change.