Head-to-head test
EcoFlow DELTA 2 vs EcoFlow RIVER 3 MAX
EcoFlow DELTA 2 vs EcoFlow RIVER 3 MAX: Buy the DELTA 2 if your loads run anywhere near its 1,800W ceiling or you want real overnight or multi-day headroom.
Full profiles: EcoFlow DELTA 2 β Β· EcoFlow RIVER 3 MAX β
Written by Ian SchneiderUpdated
Solar & Off-Grid Tester, Station Arena Test Desk
Spec deltas
The DELTA 2 and RIVER 3 Max aren't fighting for the same job. The DELTA 2 holds 1,024Wh and puts out 1,800W continuous for $499 (last listed price). The RIVER 3 Max holds 572Wh and puts out 600W for $319. That's a different class of machine, not a discount version of the same one.
Run both against six real household scenarios and four come back 'neither unit wins.' A weekend of camping, an 8-hour blackout, a full remote workday, and daily van life all ask for more energy than either box holds at either price. The two scenarios that do resolve, CPAP Overnight and Tailgate Party, both go to the DELTA 2, comfortably.
Here's the twist: the bigger, pricier unit is also the cheaper one per watt-hour, both today (49 cents per Wh against 56 cents) and over its full working life ($0.16 per lifetime kWh against $0.19). The RIVER 3 Max wins on price tag and weight alone. Everywhere ownership actually plays out, the DELTA 2 is the stronger buy, provided your loads need what it has.
What the Numbers Reveal
Each conclusion stated first β the numbers behind it on one line, the full analysis below.
Capacity
That's why the per-watt-hour price runs backwards from sticker-price intuition too. The smaller, cheaper-looking RIVER 3 Max is the more expensive way to buy a watt-hour, both today and amortized across its full life.
DELTA 2: 1,024Wh for $499 (last listed price) ($.49 per Wh)RIVER 3 Max: 572Wh for $319 ($.56 per Wh)Lifetime cost: $0.16 per kWh for the DELTA 2 vs $0.19 for the RIVER 3 Max over 3,000 cycles
Why it mattersAnyone assuming the $319 unit is the budget choice per watt-hour should check the math. The DELTA 2 is the better financial buy per unit of energy, not just the bigger one.
The honest framing isn't 'DELTA 2 vs RIVER 3 Max.' It's whether your real load sits under the RIVER 3 Max's 572Wh, between that and the DELTA 2's 1,024Wh, or genuinely past 1,024Wh. That third bucket means neither of these is the right product at any price.
Weekend Camping (2,100Wh needed), 8-Hour Blackout (1,645Wh), Remote Workday (910Wh), and Van Life Daily (4,685Wh) all resolve to neither unit winningCPAP Overnight (320Wh) and Tailgate Party (670Wh) both resolve to the DELTA 2RIVER 3 Max holds 572Wh; DELTA 2 holds 1,024Wh
Why it mattersStop asking which unit wins camping or blackout duty. Ask where your actual draw lands on that scale. That's what decides it here, not brand loyalty or a spec sheet.
continuous output
If the appliance list tops out at a laptop, a phone, and a CPAP, that weight is dead weight you'll carry and never spend. If it includes anything with real continuous draw, the weight is the toll for wattage the RIVER 3 Max doesn't have to sell.
DELTA 2 weighs 27 lbs; RIVER 3 Max weighs 18.1 lbsDELTA 2 outputs 1,800W continuous vs the RIVER 3 Max's 600WDELTA 2 holds 1,024Wh vs the RIVER 3 Max's 572Wh
Why it mattersBuy on the actual appliance list, not on which box feels like more machine.
The specific dimensions that decide these two units β everything else is a tie.
Your Life, Your Pick
Selected because: Four of six real-world loads outrun both units entirely; the other two are where this matchup is actually decided.
Four of six scenarios here come back 'neither,' and that's the most useful data point on the page. It means the question isn't which unit is better. It's whether either one is big enough for the job you actually have. Weekend Camping, an 8-Hour Blackout, a Remote Workday, and Van Life Daily all ask for more energy than either box holds. The DELTA 2 gets closer every time, but closer isn't covered.
The two scenarios that do resolve go to the DELTA 2, and neither is close. It uses about 37% of its usable capacity for a CPAP night and about 77% for a tailgate, with room left both times. The RIVER 3 Max never wins outright here, but that's a function of scale, not quality. Its job is the loads already sized for it.
Lifetime Value
Selected because: The DELTA 2 costs $180 more (on last listed prices) today but $0.16 per lifetime kWh against the RIVER 3 Max's $0.19. Bigger turns out to be the better financial buy, not the pricier one.
Sticker price says the RIVER 3 Max is the budget pick. Ownership cost says the opposite. Over 3,000 cycles the DELTA 2 works out to $0.16 per kWh delivered against $0.19 for the RIVER 3 Max, so the pricier unit is also the cheaper one to actually run. Spread across the 5-year warranty both units carry, that's $100 a year for the DELTA 2 against $64 a year for the RIVER 3 Max: more dollars, but also more machine.
Neither unit is close to wearing out on cycle count alone. Both are rated for the same 3,000 cycles, so cycle life isn't what separates them. What separates them is how much capacity that price gap actually buys, and on a per-watt-hour basis, it buys a discount, not a premium.
Portability & Form Factor
Selected because: 27 lbs against 18.1 lbs is the real cost of that extra capacity, and it's the number a lot of buyers should decide on before any of the others.
weight
The RIVER 3 Max is built to be carried, not just moved. It goes in one hand and tucks into a footwell. The DELTA 2 asks for two hands and a flat surface. Get the grip wrong on a tailgate and it's a deadlift, not a carry.
Neither is heavy in an absolute sense. This isn't a generator. But only one of them is a one-hand carry, and if that's the trip you're planning, that's the whole decision.
What the Specs Don't Tell You
Selected because: Five gotchas fire for this pair, covering noise, fixed capacity, surge headroom, UPS speed, and warranty payout, and only a couple of them should actually change your mind.
Five gotchas fire for this pair, and only a couple of them should change your mind. Surge headroom is a wash. Both units surge well above their continuous rating, which is what a competent inverter is supposed to do. Warranty length is identical at 5 years, so that's not a differentiator either; what differs is dollars paid per warrantied year, and the lifetime-value numbers above already settle that.
Noise and solar refill speed are the two that actually cut in different directions. The DELTA 2 is the louder box under real load. The RIVER 3 Max is the slower one to refill from a panel. Which one matters depends entirely on whether you're running this off a wall outlet or the sun.
Strengths & trade-offs
EcoFlow DELTA 2
Strengths
- +Larger battery capacity
- +Higher AC output
- +Faster solar charging
Trade-offs
- βNo major technical downsides compared to rival.
EcoFlow RIVER 3 MAX
Strengths
- +Lighter by 8.9 lb
Trade-offs
- βWeaker inverter (-1,200W) limits appliance compatibility.
- βSealed capacity β the DELTA 2 can add batteries to grow past 572Wh; 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 wins this one outright. A weekend's draw runs about 2.4x past the DELTA 2's usable capacity and over 4x past the RIVER 3 Max's. Both can power the individual big appliances; neither can do it for a full weekend unplugged. If you're going generator-free, the DELTA 2 is closer to sufficient and pairs with its higher solar ceiling. The RIVER 3 Max is the wrong tool for this specific job.
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
Same story at blackout scale. An 8-hour outage needs roughly 1.9x the DELTA 2's usable capacity and 3.4x the RIVER 3 Max's. Both can start and run any single appliance on the list; the shortfall is stamina, not power. The DELTA 2's gap is the smaller one to fill with a generator or the grid coming back.
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
RIVER 3 MAX
This is the one scenario either unit comfortably owns, and the DELTA 2 owns it with room to spare. A CPAP-sized night uses about 37% of its usable capacity against 66% for the RIVER 3 Max. Both get you through the night. The DELTA 2 does it using barely a third of the tank, which matters if the outage runs a second night.
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
The DELTA 2 comes close here. A workday's draw is only about 1.05x its usable capacity, close enough that trimming one device or topping up at lunch could close the gap. The RIVER 3 Max needs about 1.9x what it holds, a different kind of short. Call this one neither on paper, but the DELTA 2 is one habit change away from a yes.
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 2
The DELTA 2 clears this one with room to spare, using about 77% of its usable capacity. The RIVER 3 Max falls short, needing roughly 1.4x what it's got. This is the cleanest win on the page for the bigger unit. A tailgate's mixed load of speakers, lights, and a blender is exactly the mid-size job the DELTA 2's class exists for.
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
Van life daily use is off the chart for both units, needing about 5.4x the DELTA 2's usable capacity and about 9.6x the RIVER 3 Max's. Neither battery is the actual product here; a solar array feeding whichever one you buy is. At that point the DELTA 2's 500W solar ceiling is worth building around. The RIVER 3 Max's 220W input is less than half of that.
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 2 runs 4.2h vs 2.4h.
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
November 1, 2026
Verdict withdrawn: the DELTA 2 is no longer sold
We picked the DELTA 2, but it's been discontinued (EcoFlow now points buyers to the DELTA 3). The RIVER 3 MAX is still on sale, but that alone doesn't make it our pick. The comparison below is still accurate if you own either one.
Editor-assigned confidence, based on cited owner research and spec analysis.
Written by Ian Schneider, Solar & Off-Grid Tester Β· Station Arena Test Desk Β· Updated November 1, 2026
Black Friday Β· 26 days out
Price to beat:RIVER 3 MAX $319
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): 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 2 rates 4.1/5 (50th percentile of 27 Everyday-class units), and RIVER 3 MAX rates 4.3/5 (58th 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.
50dB Isn't the Number a CPAP Buyer Should Worry About
The DELTA 2 hits 50dB under heavy load, loud enough to notice in a bedroom. But that's a full-load spec, not a CPAP spec. The RIVER 3 Max is the quieter box across the board at 30dB, which matters more if idle noise, not max-load noise, is what you're actually buying for.
RIVER 3 MAX: Fixed Capacity
The RIVER 3 MAX is sealed at 572Wh, and that is the ceiling. Normally the counterpoint would be that the DELTA 2 can add expansion batteries, but that isn't a live option here: the DELTA 2 is no longer sold, and EcoFlow points owners to the DELTA 3. For a new purchase the expansion question doesn't arise between these two, so the RIVER 3 MAX's fixed 572Wh is simply what you get.
Surge Power: Ratio and Ceiling Disagree
The RIVER 3 MAX holds the higher surge-to-continuous ratio (2Γ vs 1.5Γ), but the DELTA 2 holds the higher absolute surge ceiling β 2,700W against 1,200W. These measure different things. The ratio says how much headroom an inverter keeps above its own rating; the ceiling says how big a startup spike it can actually swallow. A motor draws a number of watts at switch-on, not a multiple of someone else's rating, so on raw starting ability the DELTA 2 is the stronger unit here β while the RIVER 3 MAX is the one running further below its own limit at steady state.
If Either One Is Backing Up a Computer, the Speed Gap Is Real
The RIVER 3 Max switches over in under 10 milliseconds, true line-interactive speed. The DELTA 2 is standby-style, under 20 milliseconds. Both are fast enough that a laptop won't blink, but for a desktop, a NAS, or a medical device with zero tolerance for a blip, the RIVER 3 Max's faster handoff is the more conservative pick.
Warranty: No Difference
Both units carry the same 5-year warranty, so coverage isn't a tiebreaker here.
Ownership 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 2 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 3 MAX works out at $0.19/kWh over its rated life. If you already own the DELTA 2, the hardware comparison still holds: over its rated life the DELTA 2 delivers about 3,072 kWh and the RIVER 3 MAX about 1,716 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 2
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 3 MAX
FIXED CAPACITYFixed at 572Wh, 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 2 is no longer sold (EcoFlow points owners to the DELTA 3). That leaves the RIVER 3 MAX: it is sealed at 572Wh, so buy the size that covers you now. The DELTA 2's expandability still matters if you already own one, but it isn't a reason to pick it over the RIVER 3 MAX.
What Owners Report
Patterns from published owner reports and long-term reviews β every claim cited to its source below.
EcoFlow DELTA 2
The DELTA 2 has been out long enough for real multi-month verdicts, and they're consistent. Owners rate the charging speed, LiFePO4 reliability, and expandability highly after extended use, including through actual power outages and daily home-office dutyA3. The one recurring complaint is fan noise: reviewers report the fans kick in above roughly 120W of draw and run near-continuously at max load, loud enough to notice in a bedroomA1. It's load-dependent, not a constant hum. Dial back the charge speed in the app and the noise drops with itA2. EcoFlow has reportedly signaled a firmware fix is coming, as it has for fan behavior on other models beforeA4.
βWhen charging at 1200W the fans sound like a gaming laptop, though you can lower the charging speed in the app to silence it.β
Sources
portablepowerlab.com
EcoFlow RIVER 3 MAX
Coverage on this specific model is thinner than the DELTA 2's; most of what's written covers the RIVER 3 platform generally rather than the Max variant by nameB2B3. What's there is consistently positive. Reviewers frame it as the largest-capacity option in EcoFlow's compact RIVER 3 lineB1, praise the sub-30dB operation and IP54 build carried over from the rest of the platformB2, and note the 3,000-cycle LiFePO4 chemistry is good for roughly a decade of regular useB3. The throughline is that it's built for people who don't need to power a whole house and don't want to carry something that couldB4. Thin coverage on the Max nameplate specifically is worth flagging rather than smoothing over.
βOffers up to 858Wh of LFP battery storage β the largest capacity in the RIVER 3 line β as a compact, portable unit.β
Sources
powerstationadvisor.com Β· ecoflow.com Β· backuppowerhub.com Β· amazon.com Β· portablepowernerd.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 under moderate-to-high load is the dominant, repeatedly-cited complaint; the fan spins up above ~120W. [DELTA 2 Β· 3 entries]
- Largest RIVER 3 capacity (up to 858Wh), quiet IP54 build, and 3,000-cycle LFP are the standout points. [RIVER 3 MAX Β· 3 entries]
- A1
βFans trigger at anything above 120 watts; at maximum load (1,500β1,800W) they run continuously at ~48β55 dB. Powering medical equipment above 120W in a bedroom means listening to the fans or running an extension cable out of the room.β
portablepowerlab.com β EcoFlow Delta 2 Review: 6 Months of Real Use; PCWorld β EcoFlow Delta 2 review Β· 2026 Β· [negative]
- A2
βWhen charging at 1200W the fans sound like a gaming laptop, though you can lower the charging speed in the app to silence it.β
PCWorld β EcoFlow Delta 2 power station review Β· 2026 Β· [mixed]
- A3
βAfter 18 months of real-world testing through multiple power outages, camping trips, and daily home-office use, the unit earned recognition for fast charging, reliable LiFePO4 battery chemistry, and expandability.β
portablepowerlab.com β EcoFlow Delta 2 Review: 6 Months of Real Use Β· 2026 Β· [positive]
- A4
βEcoFlow officials indicated they plan to address the fan noise in an upcoming firmware update, as they have for other models after release.β
portablepowerlab.com β EcoFlow Delta 2 Review Β· 2026 (dated claim β may be partially addressed) Β· [mixed]
- B1
βOffers up to 858Wh of LFP battery storage β the largest capacity in the RIVER 3 line β as a compact, portable unit.β
powerstationadvisor.com / ecoflow.com β RIVER 3 line review Β· 2026 Β· [positive]
- B2
βBuilt on the same RIVER 3 platform reviewers praise for sub-30dB whisper-quiet operation and IP54 ruggedness.β
backuppowerhub.com β RIVER 3 review Β· 2026 Β· [positive]
- B3
βLiFePO4 chemistry rated for 3,000+ cycles to 80% β roughly a decade of everyday use.β
backuppowerhub.com / amazon.com β RIVER 3 line Β· 2026 Β· [positive]
- B4
βReviewers value the RIVER 3 family for quality engineering and genuine portability for those who don't need to power a whole house.β
portablepowernerd.com β RIVER 3 review Β· 2026 Β· [positive]
Research compiled November 1, 2026.
Who Should Buy Which
Buy the DELTA 2 if youβ¦
- βAnyone whose blackout kit needs to run a CPAP, a modem and router, and a few devices through a full night without babysitting the percentage.
- βTailgaters and small-crew campers running a speaker, string lights, and phone chargers off one box.
- βBuyers who want the lower cost per kWh over the unit's life and don't mind carrying the extra weight to get it.
Buy the RIVER 3 MAX if youβ¦
- βBuyers whose whole list is a laptop, a phone, and maybe a small fan or CPAP, loads that never approach 600W.
- βAnyone who wants a unit they can carry in one hand without planning the trip around it.
- βBudget-conscious buyers who want a genuine EcoFlow LiFePO4 unit for $319 and don't need headline wattage.
If neither fits
Anyone whose real ask is a weekend off-grid, a full work-from-home day, or van life daily power. Every one of those loads outran both units in the numbers above. That reader needs a bigger single unit, an expansion battery on a base that takes one, or a solar array doing real work, not a bigger version of either of these.
The Bottom Line
The RIVER 3 Max is the better answer to 'I need something light that'll run my CPAP and charge my phone.' The DELTA 2 is the better answer to almost everything else, and it does that while being the cheaper unit per watt-hour you'll actually draw from it: $0.16 per lifetime kWh against $0.19, on top of 79% more capacity and 3x the continuous output. That's not a small unit stretching to compete with a big one. It's the big one winning on value too.
Buy the RIVER 3 Max if your appliance list fits on one hand. Buy the DELTA 2 if it doesn't, or if you're not sure it won't grow. The only real toll is weight, and that's a price paid once, not every time you use it.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Is the EcoFlow DELTA 2 worth $180 more (on last listed prices) than the RIVER 3 Max?
If your loads run anywhere near 600W continuous, or you want real multi-day blackout headroom, yes. It also works out to $0.16 per lifetime kWh against the RIVER 3 Max's $0.19, so the extra money buys both more capacity and a better long-run price per watt-hour. If your whole load list is a laptop and a CPAP, you're paying for headroom you won't use.
Can the RIVER 3 Max run a CPAP all night?
Yes. A CPAP-sized night uses about 66% of its usable capacity, leaving a real margin, and it's the quieter of the two units at 30dB against the DELTA 2's 50dB under load. The DELTA 2 uses less of its own tank for the same job, about 37%, so it has more room left if the outage runs a second night.
What's the real difference between the DELTA 2 and the RIVER 3 Max?
They're not really built for the same job. The DELTA 2 is the multi-appliance, multi-day unit: more capacity, more continuous output, more weight to carry for it. The RIVER 3 Max is the grab-and-go option for single-device power, at about two-thirds of the weight and about a third less money. Size class, not brand quality, is what separates them.
Can either of these expand if I need more power later?
Only the DELTA 2. It supports EcoFlow's expansion batteries; the RIVER 3 Max is fixed at 572Wh, because it is already the RIVER 3 Plus with its one extra battery attached, so there's nothing further to add. The DELTA 2 also takes up to 500W of solar input against the RIVER 3 Max's 220W, so if you're planning to grow off-grid rather than off a wall outlet, it's the one that fills a bigger bank while you scale up.
Which one should I actually buy?
If your loads are a laptop, a phone, and maybe a CPAP, buy the RIVER 3 Max and save the money and the weight. If you want to run more than one thing at once, want real blackout headroom, or aren't sure your needs stop growing, the DELTA 2 is the better buy, including on a per-watt-hour basis over its life. Neither is sized for a full weekend of off-grid camping or a full remote workday without help from a wall outlet or solar panel.
Related comparisons
Where to buy
EcoFlow DELTA 2
No longer sold
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EcoFlow RIVER 3 MAX
$319.00
$319.00 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.