Head-to-head test
EcoFlow DELTA 3 Max vs EcoFlow RIVER 3 MAX
EcoFlow shipped the same power station at two sizes — same 30dBA fan, same 10ms switchover, same five-year warranty — so the only question left is whether your night ends under 572Wh or over it.
Written by Ian SchneiderUpdated
Solar & Off-Grid Tester, Station Arena Test Desk
EcoFlow
DELTA 3 Max
4,337Power Score · Appliance Class
$849.00 list · direct from EcoFlow
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EcoFlow
RIVER 3 MAX
2,472Power Score · Appliance Class
$319.00 list · direct from EcoFlow
Spec deltas
Buy the DELTA 3 Max. It costs $530 more than the RIVER 3 MAX ($849 against $319) and holds 2,048Wh against 572Wh, and in three of the six loads we model that gap is the difference between finishing the night and not.
What makes this matchup unusually clean is how much of it is identical. Same 30dBA noise floor. Same 100W USB-C port, same 10ms switchover to battery, same five-year warranty. EcoFlow built one experience and shipped it at two sizes, which strips the decision down to a single question: does 572Wh finish your night?
For a real set of buyers it does, and those buyers should take the RIVER and the $530. It's a 10.4 lb one-hand carry, off the shelf and into a canoe, against 50.7 lb of DELTA that is a bent-knees lift out of a trunk. If your load list is a phone, a laptop, a string of lights and a CPAP, the big box is a heavy way to buy reserve you'll never reach for.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
continuous output
But four RIVERs cost $1,276 (4 x $319), which is $427 more than the DELTA, and they never add up to one 2,400W outlet. You get four separate 600W islands, each with its own charge state, and the fridge has to pick one. Capacity stacks across boxes. Inverter headroom doesn't.
RIVER 3 MAX: 572Wh, 10.4 lb, $319DELTA 3 Max: 2,048Wh, 50.7 lb, $849RIVER inverter: 600W continuous, 1,200W surge. DELTA inverter: 2,400W continuous, 4,800W surge
Why it mattersIf you're eyeing the RIVER because you can always buy a second one later, price the fourth one now: the stack costs more and still can't start what a 4,800W surge starts.
So expanding the RIVER doesn't reach the DELTA's starting line, and it doesn't reach an eight-hour blackout either, which asks 1,645Wh. The word expandable is true on both spec sheets and means grows toward adequate on one, grows past it on the other.
Both units are listed expandable and both take EcoFlow expansion batteriesThe RIVER 3 line tops out at 858WhB1DELTA 3 Max base capacity: 2,048Wh, before anything is added8-Hour Blackout load: 1,645Wh
Why it mattersIf the plan is buy small now and grow into it, the number to check is the RIVER's ceiling, not its price.
solar input
The DELTA accepts nine times the panel (1,000W against 110W), which is the difference between recharging as a background task and recharging as the day's project. On night three of an outage, the spec deciding whether you're comfortable isn't capacity. It's how fast the sun puts it back.
DELTA 3 Max solar input ceiling: 1,000W. RIVER 3 MAX: 110WA full solar refill of the RIVER takes 7.4 hours8-Hour Blackout load of 1,645Wh is 338% of the RIVER's usable bank and 94% of the DELTA's
Why it mattersAnyone buying for storm season should read the solar input line before the capacity line.
rated cycles
So the 10-cent number is real and mostly theoretical for the emergency buyer. If the unit spends 50 weeks a year in a closet, you aren't buying energy at a rate. You're buying an insurance policy, and the honest question is how big a policy you need, not how good its per-unit math looks.
DELTA: $849, 4,000 cycles, 2,048Wh, for 8,192 kWh over its life at 10 cents a kilowatt-hourRIVER: $319, 3,000 cycles, 572Wh, for 1,716 kWh at 19 centsAt weekend cadence the DELTA lasts 38.5 years and the RIVER 28.8, against a 5-year warranty on both
Why it mattersDaily and weekly users should let the lifetime column decide. Closet-and-blackout buyers should ignore it and buy on capacity and weight.
The specific dimensions that decide these two units — everything else is a tie.
Your Life, Your Pick
Selected because: Three of the six loads we model finish on the DELTA and stall on the RIVER; one finishes on both, and two finish on neither.
Read these two columns as muscle and stamina, because the engine separates them. The RIVER can start the peak load in all six scenarios. It never trips and never refuses. It finishes exactly one of them, the CPAP night. The DELTA finishes four. The 600W inverter was never the problem; 572Wh was.
The two the DELTA misses are the two nobody should be shopping this pair for. Weekend camping asks 2,100Wh and van life daily asks 4,685Wh, which come to 121% and 269% of the DELTA's usable bank. That's the table telling you politely to buy two units or a wired system. Inside the range these boxes are actually for, a blackout, a work-from-anywhere day, a tailgate, the DELTA clears everything and the RIVER clears nothing.
Portability & Form Factor
Selected because: 10.4 lb against 50.7 lb is the RIVER's entire argument, and for a real set of buyers it's enough.
weight
Forty pounds separates these two, and forty pounds is a different relationship with an object. 10.4 lb is a one-hand carry: off a shelf, into a canoe, onto a picnic table without a thought. 50.7 lb is both hands, bent knees, and a decision about whether it's worth bringing at all. That decision is the RIVER's entire market, and it's a real one.
The trap is buying light and then wanting the weight anyway. A unit you can carry but that quits at 10 p.m. gets left home after the third trip. A unit you resent lifting but that runs the whole weekend gets lifted. Be honest about which failure you'd rather have, because you can put a heavy box on a hand truck and you can't put more watt-hours in a light one.
Growth Path
Selected because: Both spec sheets say expandable; only one of them backs it with a 1,000W solar ceiling against 110W.
solar input
Both boxes say expandable, and the word does different work in each mouth. The DELTA pairs expansion with a 1,000W solar ceiling, so a bigger bank has something capable of filling it. The RIVER's 110W input means any battery you bolt on takes most of a day to charge from the sun. Growth isn't only capacity. It's whether you can keep the capacity fed.
And the ceiling matters more than the mechanism. The RIVER 3 line tops out at 858WhB1; the DELTA starts at 2,048Wh. Buying the small one with a plan to grow means growing to a number still under half the big one's starting point. If you already know your needs are climbing, the expansion path isn't the argument for the RIVER. It's the argument against it.
Lifetime Value
Selected because: Ten cents a lifetime kilowatt-hour against nineteen, and the cheaper box is the one selling the pricier energy.
cost / lifetime kWh
Ten cents a lifetime kilowatt-hour against nineteen. The DELTA delivers 8,192 kWh across 4,000 cycles for its $849; the RIVER delivers 1,716 kWh across 3,000 for its $319. The small box is the expensive energy, and that's before you notice it's also the one that runs out.
The catch is ours to volunteer: that math only cashes if you cycle the thing. At weekend use the DELTA runs 38.5 years and the RIVER 28.8, so both die of old age long before either runs out of cycles, and the per-kWh figure quietly stops mattering. If this unit's real job is to sit in a closet until the power goes out, buy on capacity and weight and let the lifetime column go.
What the Specs Don't Tell You
Selected because: A full solar refill takes 7.4 hours on the RIVER, which is most of a usable winter day.
rated cycles
The card worth stopping on is the RIVER's solar refill: 7.4 hours from empty at its 110W ceiling. On a June afternoon that's a non-event. In February, or under cloud, it's the entire usable day spent putting back a battery that empties again by dinner, which is the exact week you bought it for.
The warranty card is a wash and the cycle-life card nearly is. Both units carry five years. The DELTA's 4,000 cycles work out to 11 years of daily use against the RIVER's 8.2, a real gap that only shows up for the rare buyer who drains and refills a power station every single day.
Strengths & trade-offs
EcoFlow DELTA 3 Max
Strengths
- +Larger battery capacity
- +Higher AC output
- +Faster solar charging
- +Rated for 4,000 charge cycles — much longer battery lifespan
Trade-offs
- –Substantially more expensive (+$530) than the RIVER 3 MAX.
- –Significantly heavier (+40.3 lbs), making it harder to move.
EcoFlow RIVER 3 MAX
Strengths
- +Costs $530 less
- +Lighter by 40.3 lb
Trade-offs
- –Weaker inverter (-1,800W) limits appliance compatibility.
- –Shorter-lived battery — rated for 3,000 charge cycles vs the DELTA 3 Max'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 · 2 nights · needs 2,100Wh
Weekend Camping
Two nights off-grid with essential comfort
Neither unit
Neither one gets you through the weekend on a single charge. The 2,100Wh load asks 121% of the DELTA's usable bank and 432% of the RIVER's, which is one unit missing by a nose and the other by a mile. Only one of them can close that gap while the sun is up: the DELTA takes 1,000W of solar, the RIVER 110W.
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
DELTA 3 Max
The DELTA takes this one, and not by much. 1,645Wh leaves it at roughly 6% of its usable bank when the lights come back, while the RIVER covers under a third of the same night at 338% of its capacity. Both reconnect in 10ms, so neither lets your router blink. The only difference is how long it keeps not blinking.
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
Either unit
The DELTA wins this on headroom and nothing else: 320Wh is 18% of its usable bank against 66% of the RIVER's. Both machines run the full night, both sit at 30dBA eighteen inches from your head, and both switch over in 10ms if the wall drops out. If CPAP is genuinely the whole job, the extra $530 ($849 against $319) is buying you the second and third night, not the first.
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
DELTA 3 Max
The RIVER 3 MAX runs out of juice. It only has 486Wh usable, but this scenario needs 910Wh. The DELTA 3 Max covers it and still has 55h of phone charging left over.
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 Max
The RIVER 3 MAX runs out of juice. It only has 486Wh usable, but this scenario needs 670Wh. The DELTA 3 Max covers it and still has 71h of phone charging left over.
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
Van life daily wants 4,685Wh and neither box is in that conversation, with the DELTA holding 2,048Wh and the RIVER 572Wh. This is the scenario that tells you you're shopping the wrong shelf: full-time van power is a wired house bank with alternator charging, not a box on the floor with a handle. If you insist on doing it portable, the DELTA's 1,000W solar ceiling against the RIVER's 110W is the only version that puts a real dent back in the day.
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 Max runs 8.5h vs 2.4h.
$849 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 0–116.1hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–23.2hHigh-Draw Appliances
These reveal the real limitsscale 0–1.7h¹ 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
August 1, 2026
Verdict: the DELTA 3 Max, on Power Score margin
Take the DELTA 3 Max at $849 unless you can name the exact reason you need to carry it one-handed. It finishes four of the six loads we model to the RIVER's one, including the 8-hour blackout at 1,645Wh, and it delivers its energy cheaper over its life: 10 cents a lifetime kilowatt-hour against 19. The RIVER's case is real and it is short. It weighs 10.4 lb against 50.7 lb and saves you $530 ($849 against $319), and if your ceiling is genuinely a CPAP and a laptop, that case wins outright. Everyone in between, which is most of the people landing on this page, should stop trying to make 572Wh stretch.
Editor-assigned confidence, based on cited owner research and spec analysis.
List prices as of August 1, 2026. The links below open EcoFlow's current price.
$849.00 list · direct from EcoFlow
or check the RIVER 3 MAX price$319.00 list
Written by Ian Schneider, Solar & Off-Grid Tester · Station Arena Test Desk · Updated August 1, 2026
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, Solar Generator, Food Truck, Camping.
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 Max rates 4.4/5 (63rd percentile of 25 Large-class units), and RIVER 3 MAX rates 4.6/5 (78th 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.
7.4 Hours Is Most of a Winter Day
A full solar refill of the RIVER takes 7.4 hours at its 110W ceiling. In June that's a non-event. In February, or under cloud, it's the entire usable day spent putting back a battery that empties again by dinner, which is the exact week you bought it for. The DELTA accepts 1,000W, nine times the panel, so its refill runs alongside the day instead of consuming it.
Five Years Each, So Read This Card Carefully
Both units carry the same five-year warranty, so the coverage itself is a tie. What this card actually shows is price divided by years: $170 a year on the DELTA against $64 on the RIVER. That's a fact about what you paid, not about how well either one is backed. Don't read it as a quality gap.
Eleven Years Against 8.2, If You Ever Get There
4,000 cycles versus 3,000 works out to 11 years of daily use against 8.2. Real gap, rarely collected. At weekend cadence the DELTA runs 38.5 years and the RIVER 28.8, which means both die of old age with cycles left over. Cycle life decides this matchup only for the buyer who genuinely drains and refills a power station every single day.
Full record above — the Test Desk pick is the DELTA 3 Max.
Check DELTA 3 Max price →or check the RIVER 3 MAX 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 3 MAX is cheaper to buy, but the DELTA 3 Max is cheaper to own. At $0.1/kWh over its lifetime vs $0.19/kWh, the DELTA 3 Max's higher cycle life and capacity make each dollar go further over the years.
Growth path
DELTA 3 Max
EXPANDABLESupports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 2,048Wh.
Accepts up to 1,000W of solar. Enough for a serious multi-panel array.
Generous port selection supports complex multi-device setups.
Expansion batteries are EcoFlow-specific. You're investing in the EcoFlow ecosystem.
RIVER 3 MAX
EXPANDABLESupports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 572Wh.
Accepts up to 110W of solar. Limited to a single portable panel.
Adequate ports for most setups, but heavy users may want a power strip.
Expansion batteries are EcoFlow-specific. You're investing in the EcoFlow ecosystem.
Realistic full solar rechargeat 70% of rated panel output — see methodology
Analyst note
Both expand, but the DELTA 3 Max's higher solar ceiling (1,000W vs 110W) gives it the stronger off-grid growth path — more panels can feed a bigger bank as it grows.
What Owners Report
Patterns from published owner reports and long-term reviews — every claim cited to its source below.
EcoFlow DELTA 3 Max
The DELTA 3 Max's field record comes from hands-on reviewers rather than long-haul owners, with no large forum threads surfacing this pass, so read it as months of testing rather than years of ownershipA3A4. What that testing found holds up well: capacity stayed consistent between the one-month and three-month checks, and the unit came through truck-bed transport, storage in a roughly 105F garage, and operation near 34F without troubleA3. One reviewer scored it 8.5/10 and called its combination of fast recharge and LFP longevity among the best value in the 2kWh classA4.
The quiet is the part reviewers keep coming back to. At conversational distance it's effectively silent under moderate load, and the app adds a quiet mode plus a custom charge-speed limit for the times the fans do climbA1A2. That app is a large part of why people end up inside EcoFlow's ecosystem rather than out of it, since the on-device controls don't come close to itA2.
“Whisper-quiet under moderate load — essentially silent at conversational distance; the app adds a low-power quiet mode and a custom charge-speed limit if fan noise bothers you. Fans rise under heavy load but stay quieter than most competitors in the 2kWh class.”
Sources
backuppowerhub.com · thesolarlab.com · androidguys.com
EcoFlow RIVER 3 MAX
Coverage of the RIVER 3 MAX runs at the platform level more than the model level, so the family's reputation is most of the evidence available hereB2B4. The RIVER 3 line earns consistent praise for sub-30dB operation and an IP54 rating, which is the kind of spec that matters when the thing lives in a truck bed or a boat lockerB2. Reviewers frame the family as genuine portability with real engineering behind it, built for people who never intended to power a houseB4.
Two numbers are worth having in front of you before you buy the small one. Its LFP cells are rated 3,000+ cycles to 80%, which reviewers put at roughly a decade of everyday useB3. And 858Wh is the top of the RIVER 3 line, not its starting pointB1, which is the figure to weigh if you're planning to grow into it rather than out of it.
“Offers up to 858Wh of LFP battery storage — the largest capacity in the RIVER 3 line — as a compact, portable unit.”
Sources
powerstationadvisor.com · ecoflow.com · backuppowerhub.com · amazon.com · 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
- Reviewers consistently praise practical quietness (with app-based quiet/charge-limit modes) and the EcoFlow app/ecosystem as differentiators. [DELTA 3 Max · 2 entries]
- Largest RIVER 3 capacity (up to 858Wh), quiet IP54 build, and 3,000-cycle LFP are the standout points. [RIVER 3 MAX · 3 entries]
- A1
“Whisper-quiet under moderate load — essentially silent at conversational distance; the app adds a low-power quiet mode and a custom charge-speed limit if fan noise bothers you. Fans rise under heavy load but stay quieter than most competitors in the 2kWh class.”
backuppowerhub.com — EcoFlow DELTA 3 Max Review; thesolarlab.com — DELTA 3 Max Review · 2026 · [positive]
- A2
“The EcoFlow app is one of the main reasons people migrate to the ecosystem: deep control including a custom charge-speed limit and quiet mode, well beyond the on-device interface.”
androidguys.com / thesolarlab.com — EcoFlow DELTA 3 Max line · 2026 · [positive]
- A3
“Capacity stayed consistent between 1-month and 3-month tests (within measurement error). The unit survived truck-bed transport, storage in a ~105°F garage, and operation near freezing (~34°F) without issue.”
backuppowerhub.com — EcoFlow DELTA 3 Max Review (hands-on) · 2026 · [positive]
- A4
“Rated 8.5/10 overall — strong across nearly every metric in the 2kWh class, with fast recharge and LFP longevity called one of the best value propositions in the segment.”
backuppowerhub.com — EcoFlow DELTA 3 Max Review · 2026 · [positive]
- B1
“Offers up to 858Wh of LFP battery storage — the largest capacity in the RIVER 3 line — as a compact, portable unit.”
powerstationadvisor.com / ecoflow.com — RIVER 3 line review · 2026 · [positive]
- B2
“Built on the same RIVER 3 platform reviewers praise for sub-30dB whisper-quiet operation and IP54 ruggedness.”
backuppowerhub.com — RIVER 3 review · 2026 · [positive]
- B3
“LiFePO4 chemistry rated for 3,000+ cycles to 80% — roughly a decade of everyday use.”
backuppowerhub.com / amazon.com — RIVER 3 line · 2026 · [positive]
- B4
“Reviewers value the RIVER 3 family for quality engineering and genuine portability for those who don't need to power a whole house.”
portablepowernerd.com — RIVER 3 review · 2026 · [positive]
Research compiled August 1, 2026.
Who Should Buy Which
Buy the DELTA 3 Max if you…
- →You're buying for the next outage, not the last one. An eight-hour blackout asks 1,645Wh, and the DELTA is the only one of these two that finishes it, with about 6% of its usable bank left. Don't plan on two nights without sun.
- →You run something with a compressor. 2,400W continuous and 4,800W surge starts a fridge or a window AC without argument. 600W and 1,200W is a different appliance list entirely.
- →You want solar to be a background process. 1,000W of input means the panels do their work while you do yours, instead of the refill becoming the day's activity.
- →You'll actually cycle it: RV weekends, job sites, van trips. That's the buyer the 10-cent lifetime kilowatt-hour was written for.
Buy the RIVER 3 MAX if you…
- →Your whole load list is a phone, a laptop, a camera battery and a string of lights. 572Wh covers that night with room to spare, and you keep $530 ($849 against $319).
- →You're the one carrying it. 10.4 lb goes in one hand up a trail or onto a shelf. 50.7 lb decides your afternoon for you.
- →It's for a CPAP and nothing else. A CPAP night is 320Wh, or 66% of the RIVER's usable bank, and it sits at the same 30dBA and switches over in the same 10ms as the DELTA.
- →It lives outdoors, in a truck bed or on a boat. The RIVER 3 platform's IP54 rating is why reviewers trust it thereB2.
If neither fits
If you're powering a van full-time or a house circuit, close this tab. Van life daily asks 4,685Wh and the bigger of these two holds 2,048Wh, so what you want is a wired house bank with alternator charging and a proper inverter, not a box on the floor with a handle. Same answer if you need a full weekend of camping off one charge (2,100Wh) and refuse to carry panels: shop a tier up, not either of these.
The Bottom Line
Take the DELTA 3 Max. It finishes four of the six loads we model to the RIVER's one, it delivers its energy at 10 cents a lifetime kilowatt-hour against 19, and it's the only one of the two that walks out of an eight-hour blackout still running. The RIVER isn't a bad box. It's the same box at a size that stops short of what most people comparing these two are trying to do.
There's exactly one clean reason to go the other way, and it weighs about forty pounds. If you're the person doing the carrying, 10.4 lb against 50.7 lb settles the argument before capacity gets a vote, and $530 stays in your pocket. Everyone else: buy the one that finishes the night.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Is the DELTA 3 Max worth $530 more than the RIVER 3 MAX?
If you need more than 572Wh in one box, yes, and not really by choice. At $849 against $319 the DELTA gives you 2,048Wh, a 2,400W inverter against 600W, and nine times the solar input (1,000W against 110W). If your load list genuinely fits inside 572Wh, the extra money buys reserve you'll never reach for, and the RIVER is the better buy.
Can the RIVER 3 MAX run a refrigerator?
It can start the peak load in all six of the scenarios we model, so muscle isn't the issue at 600W continuous and 1,200W surge. Stamina is. 572Wh doesn't hold a fridge through the night, and the RIVER falls short in five of those six profiles. If a fridge is the reason you're shopping, the DELTA's 2,048Wh and 2,400W inverter is the answer.
Which one should I get for a CPAP?
Either one runs the machine all night. A CPAP night is 320Wh, which is 18% of the DELTA's usable bank and 66% of the RIVER's. Both sit at 30dBA and both switch over in 10ms, so neither will wake you or drop you mid-breath. If CPAP is the only job, take the RIVER and the $530; if you want a second and third night without a wall outlet, that's what the DELTA's capacity buys.
Do both of these actually expand?
Both accept EcoFlow expansion batteries, but they expand to very different places. The RIVER 3 line tops out at 858Wh, which is less than half of what the DELTA holds out of the box at 2,048Wh. Expansion is a reason to buy a DELTA over a smaller DELTA. It isn't a reason to buy the RIVER over the DELTA.
How long does solar take to refill each one?
The RIVER needs 7.4 hours from empty at its 110W ceiling, which is most of a usable winter day. The DELTA accepts 1,000W, nine times as much panel, so its refill happens alongside your day instead of defining it. If you're buying for multi-day outages, this line matters more than the capacity line does.
Where to buy
EcoFlow DELTA 3 MaxPick
$849.00
$849.00 list · direct from EcoFlow
EcoFlow RIVER 3 MAX
$319.00
$319.00 list · direct from EcoFlow
Prices may vary by retailer and are subject to change.