Head-to-head test
EcoFlow RIVER 3 MAX vs BLUETTI AC50B
The RIVER 3 MAX is the cheaper and bigger of the two, and it takes more solar, so the AC50B only earns a place if you want the lighter carry or want to run a kettle or small heater off its Power Lifting mode.
Full profiles: EcoFlow RIVER 3 MAX → · BLUETTI AC50B →
Written by Wenny ZhengUpdated
Portable Power Tester, Station Arena Test Desk
Spec deltas
The RIVER 3 MAX costs $80 less than the AC50B and still packs 124Wh more battery. Usually the bigger battery is the pricier one. Here it isn't, and the extra capacity costs only 3.3 lb.
Run the ratio and they come out close: about 32Wh per pound for the RIVER (572Wh over 18.1 lb) against about 30 for the AC50B (448Wh over 14.8 lb). The RIVER is the one you'd notice hanging off your arm on the walk from the car to the campsite, but it's carrying more for the trip.
The AC50B isn't without a case. It's 3.3 lb lighter, and its 700W inverter with Power Lifting will run a 1,000W resistive appliance the RIVER won't touch. Those are real, and they're narrow. Everyone else should take the EcoFlow.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
weight
Add that it's also the cheaper of the two and the usual size-versus-price trade collapses. You aren't paying for the extra capacity in dollars, and in pounds you pay for it at about the rate the AC50B charges for its own.
RIVER 3 MAX: 572Wh, 18.1 lbAC50B: 448Wh, 14.8 lbRIVER 3 MAX is $80 cheaper at typical prices
Why it mattersAnyone who was leaning AC50B for price has lost that reason in this pairing; portability is its one edge, and it's 3.3 lb.
solar input
On a short solar day the RIVER banks more energy, not less. Give both two hours of strong sun and the RIVER takes in about 440Wh (220W times 2) against the AC50B's 400Wh (200W times 2); the AC50B only reaches full first because it has less to fill. Those are ceilings at ideal panel angle, so real days deliver less to both, but the ratio holds.
RIVER 3 MAX: 220W max solar input, 572WhAC50B: 200W max solar input, 448Wh
Why it mattersIf panels will be the main charger, the RIVER's bigger input and bigger tank both work in its favour; solar isn't a reason to pick the AC50B.
At a CPAP's roughly 40W, that's about 4 more hours of spare on the RIVER against about 1.5 on the AC50B. The RIVER covers the night with half a night in hand; the AC50B covers it with an alarm-clock snooze or two.
CPAP Overnight needs 320WhRIVER 3 MAX: 486Wh usable after the 85% derateAC50B: 381Wh usable after the 85% derate
Why it mattersCPAP users who'd rather not watch the battery percentage at 5 a.m. should take the RIVER.
continuous output
The RIVER is the better hub for the way most people use a unit this size, with three AC sockets running a lamp, a fan and a laptop brick at once, plus a published surge figure at twice its continuous rating. Power Lifting does nothing for a compressor or a power tool, and a 1,000W heater drains 448Wh fast either way.
RIVER 3 MAX: 600W output, 1,200W surge, 3 AC outletsAC50B: 700W output, surge unpublished, 1 AC outletAC50B: Power Lifting runs resistive appliances up to 1,000W
Why it mattersBuy the AC50B for the kettle only if the kettle is genuinely the reason you're buying; otherwise the three outlets matter more.
The specific dimensions that decide these two units — everything else is a tie.
Portability & Form Factor
Selected because: The AC50B is the lighter unit at 14.8 lb against 18.1, but the RIVER carries 124Wh more for the extra 3.3 lb.
weight
Three pounds sounds trivial until it's in one hand and a cooler is in the other. The AC50B is the lighter carry and the RIVER the bigger battery, which is how this usually goes; what's unusual is that the bigger one is also the cheaper one.
Neither is heavy in any absolute sense; both are one-hand lifts. If the AC50B looked like the compact option, the scale agrees, by 3.3 lb.
Runtime: Will It Power Your Gear?
Selected because: Both pass a CPAP night, but the RIVER finishes with 166Wh left against the AC50B's 61Wh.
continuous output
The CPAP night is the one scenario here both units actually finish, and it's where the 124Wh gap stops being a spec-sheet number. The RIVER wakes up with about 4 hours of CPAP still in the tank; the AC50B with about an hour and a half.
Everything bigger, from the 8-hour blackout list at 1,645Wh to a weekend campsite at 2,100Wh, is out of reach for both. These are overnight-and-a-device units. The RIVER is just the one with more slack built in.
What the Specs Don't Tell You
Selected because: Power Lifting is the one place the AC50B genuinely pulls ahead; noise and UPS class lean the RIVER's way.
Solar isn't a weakness for the RIVER. Its 220W ceiling refills 572Wh in about 2.6 hours of ideal sun, where the AC50B's 200W input does its smaller battery in about 2.2. The AC50B reaches full a little sooner only because it has less to fill.
The AC50B's other card is Power Lifting, which runs a resistive appliance up to 1,000W from its 700W inverter by feeding it less power than it asks for. The kettle boils, just more slowly. On UPS duty the RIVER's ≤10ms rating sits in a safer class for fussy desktop power supplies than the AC50B's ≤20ms, though both are ceilings, not lab results.
Growth Path
Selected because: Neither expands: the RIVER 3 MAX already carries its one extra battery and the AC50B is fixed at 448Wh, so the RIVER's 124Wh head start is permanent.
solar input
The RIVER starts 124Wh ahead and stays there. It's a RIVER 3 Plus that already carries the one extra battery that host accepts, so 572Wh is its ceiling. At this size neither unit was ever a path to home backup.
The AC50B's B80 pack, per BLUETTI's own FAQ, attaches in Power Bank Mode and recharges the unit rather than extending it as one systemB4. Useful as a spare tank, but it isn't expansion, and the AC50B's ceiling stays at 448Wh.
Lifetime Value
Selected because: Same 3,000-cycle rating on record, so the cheaper, bigger unit wins cost per lifetime kWh: $0.19 against $0.30.
cost / lifetime kWh
Nineteen cents per lifetime kilowatt-hour against thirty. With both packs rated for at least 3,000 cycles, that gap is just the price and capacity difference carried across the battery's life, and it points the same way as everything else on this page.
Warranty doesn't break the tie: both run 5 years, with the BLUETTI's term depending on buying direct or registering.
Strengths & trade-offs
EcoFlow RIVER 3 MAX
Strengths
- +Costs $80 less
- +Larger battery capacity
- +Faster solar charging
Trade-offs
- –No major technical downsides compared to rival.
BLUETTI AC50B
Strengths
- +Lighter by 3.3 lb
- +Higher AC output
Trade-offs
- –No major technical downsides compared to rival.
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 this scenario's 2,100Wh: the RIVER 3 MAX comes up 1,614Wh short (about 23% covered), the AC50B 1,719Wh (18%). 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
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 covers this scenario's 1,645Wh: the RIVER 3 MAX comes up 1,159Wh short (about 30% covered), the AC50B 1,264Wh (23%). 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
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
RIVER 3 MAX
Both get you to morning; the difference is how much is left when you do. The RIVER 3 MAX finishes with 166Wh in reserve, about 4 more hours at a CPAP's 40W. The AC50B finishes with 61Wh, roughly an hour and a half. Only one of those lets you sleep in.
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 covers this scenario's 910Wh: the RIVER 3 MAX comes up 424Wh short (about 53% covered), the AC50B 529Wh (42%). Treat this as partial cover — enough for the essentials in it, not the whole list.
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
Neither unit
Neither covers the full 670Wh, so plan around it rather than rule either out: the RIVER 3 MAX comes up 184Wh short, the AC50B 289Wh. The RIVER's three AC sockets against one is the bigger practical difference once the speaker, lights and a slow cooker all want a plug.
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 covers this scenario's 4,685Wh: the RIVER 3 MAX comes up 4,199Wh short (about 10% covered), the AC50B 4,304Wh (8%). 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
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 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: RIVER 3 MAX runs 2.4h vs 1.9h.
$319 list · direct from EcoFlow
Planning for more than this? Describe your whole setup and get it sized →
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 0–32.4hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–6.5hHigh-Draw Appliances
These reveal the real limits¹ 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
November 1, 2026
Verdict: the RIVER 3 MAX
Take the RIVER 3 MAX. It's $80 cheaper at typical prices and it carries 572Wh against 448Wh, so the two things most buyers at this size compare first both go its way. It also has three AC outlets to the AC50B's one, a published 1,200W surge, a ≤10ms UPS rating against ≤20ms, and 220W of solar input against 200W. The AC50B wins two specific jobs: the carry, at 14.8 lb against 18.1, and running a resistive appliance like a kettle through its 1,000W Power Lifting mode. If neither of those is why you're shopping, the RIVER is the buy.
Editor-assigned confidence, based on cited owner research and spec analysis.
List prices as of November 1, 2026. The links below open EcoFlow's and BLUETTI's current prices.
$319.00 · direct from EcoFlow
Last checked 28 days ago. Prices move — check before you buy.
or check the AC50B price$399.00 list
Written by Wenny Zheng, Portable Power Tester · Station Arena Test Desk · Updated November 1, 2026
Black Friday · 26 days out
Prices to beat:RIVER 3 MAX $319AC50B $279
The lowest we have recorded for each. We have never seen the RIVER 3 MAX discounted, so any real cut on it would be a first.
Measured Data
Benchmark scores and the full spec record, side by side.
Benchmark scores
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, RIVER 3 MAX rates 4.3/5 (58th percentile of 20 Compact-class units), and AC50B rates 4.6/5 (79th percentile of 25 Personal-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.
AC50B: 45dB Published
45dB is about as loud as a running refrigerator. The RIVER 3 MAX is rated 30dB, and the two are not the same kind of figure: the RIVER 3 MAX's is a MAXIMUM under heavy charge and discharge, while the AC50B's is its maker's best case — so the real gap can only be wider than the numbers suggest: the RIVER 3 MAX's ceiling already sits below the AC50B's floor. For most people, fan noise around 45dB and up is where sleep starts to suffer.
AC50B: Power Lifting Runs a Kettle, Slowly
Power Lifting lets the AC50B's 700W inverter run a resistive appliance rated up to 1,000W by feeding it less power than it asks for, so the kettle still boils, just more slowly. It's scoped to resistive loads, so it does nothing for a compressor or a power tool, and BLUETTI publishes no surge figure for this unit. Genuinely useful if a heater or kettle is the job. The RIVER 3 MAX has no equivalent.
UPS Switchover: ≤10ms vs ≤20ms
Both list a UPS mode, at different rated speeds. The RIVER 3 MAX is rated ≤10ms — quick enough on paper that desktop PCs and routers should ride through, treating that as the rating it is. The AC50B is rated ≤20ms — fine on paper for routers and most electronics; the fussiest PC power supplies sit right at this line. If a computer with unsaved work is the thing being protected, the stated class is worth the attention; nothing here is a lab result.
Warranty: No Difference
Both units carry the same 5-year warranty, so coverage isn't a tiebreaker here. The AC50B's figure is a maximum rather than a guarantee — it depends on buying direct from BLUETTI or registering the unit, since reseller purchases carry a shorter term. Worth saying because the per-dollar framing can suggest otherwise: the RIVER 3 MAX works out at 15.7 years of cover per $1,000 spent against the AC50B's 12.5, but that spread is the price gap, not the terms.
Full record above — the Test Desk pick is the RIVER 3 MAX.
Check RIVER 3 MAX price →or check the AC50B 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 wins on both sticker price and long-term value. At $0.19/kWh over its lifetime, it's meaningfully cheaper to own. Clear value winner. 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 — the wear horizon is identical and decides nothing here.
Delivers each lifetime kWh for $0.11 less — check the RIVER 3 MAX price →
Brand trust
EcoFlow
Ecosystem
Largest in portable power — 12-15 models across DELTA Pro, DELTA 3, and RIVER 3 series, plus solar panels and smart home panels
Support
US-based phone/email/chat support (1-800-368-8604). Experiences are polarized — many report hassle-free prepaid-label replacements, but others report long waits and refurbished units sent for new claims. Pro tip: buying from Costco or Amazon gives you a stronger return safety net.
Community
Largest community in the space — Reddit r/Ecoflow_community (~31K members), multiple Facebook groups, and an official community forum
App experience
Rated 4.6/5 iOS (~8,400 ratings) · 4.2/5 Android (~17,000 ratings)
Unique strength
Fastest-charging technology (X-Stream), deepest product ecosystem, and most active innovation cadence. At the top of the range sit two whole-home paths: the TITAN line, one 5 kWh unit that grows to 30 kWh, and the DELTA Pro Ultra platform, which stacks batteries and inverters further — flagship paths, not line-wide features.
Worth knowing
Support experiences are polarized, and EcoFlow offers no parts or service once the warranty runs out. Buying through a big-box retailer gives you a stronger return safety net.
BLUETTI
Ecosystem
One of the broadest lineups — 15-20+ models from budget (AC2A) to flagship portable (Apex 300, 2764.8Wh). Includes specialized products: vehicle solar hubs, sodium-ion cold-weather units, and balcony storage systems.
Support
The most inconsistent support in the space. Heavily email-based with China timezone delays. Some users get smooth, efficient service; others report weeks of troubleshooting runarounds, being offered discounts on new units instead of repairs, and confusing third-party purchase claim processes. Buying direct from Bluetti's website tends to produce better support outcomes.
Community
Active and growing — Reddit r/bluetti has a dedicated community. Second-largest after EcoFlow in engagement.
App experience
Rated 4.5/5 iOS and Android — tied for best app experience in the category. V3.0 UI redesign was well-received.
Unique strength
Among the best capacity-to-price ratios available — several Elite and Apex units are the lowest $/Wh in the catalog. Widest product diversity including industry-firsts like sodium-ion cold-weather units and dual solar+alternator vehicle hubs. LFP across the rest of the range, though rated cycle life spans 2,500 (EB3A) to 6,000, and it varies WITHIN the Elite range rather than tracking it — the Elite 300 and Elite 200 V2 are rated 6,000 while the Elite 30 V2, Elite 10 Mini, Elite 320 and Elite 400 are rated 3,000+ and the Elite 100 V2 4,000+, so check the specific model. Dual-voltage (120V/240V) in flagships.
Worth knowing
Support is the most inconsistent in the space and heavily email-based. Buying direct from BLUETTI tends to go more smoothly, and it's also what unlocks the longer warranty term.
Analyst note
BLUETTI's reputation is capacity for the money, and across much of its range that holds. Not here: in this pairing it's the BLUETTI that costs more per watt-hour, so the brand's usual argument belongs to the EcoFlow.
Growth path
RIVER 3 MAX
FIXED CAPACITYFixed at 572Wh, 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.
AC50B
FIXED CAPACITYFixed at 448Wh, with no expansion — so size it for your needs up front rather than planning to add capacity later.
Accepts up to 200W of solar. Limited to a single portable panel.
Limited ports. You'll likely need a power strip or splitter.
Realistic full solar rechargeat 70% of rated panel output — see methodology
Analyst note
Neither expands, and that's no knock on either — each is a complete unit at a fixed size. Buy the capacity that covers your needs now (the RIVER 3 MAX gives you the larger ceiling); you can't add to either later.
What Owners Report
Patterns from published owner reports and long-term reviews — every claim cited to its source below.
EcoFlow RIVER 3 MAX
Field data on this exact SKU is thin; our research notes that most coverage is written at the RIVER 3 platform level rather than about the MAX specificallyA0. At that level, reviewers praise the platform for quiet running and an IP54-rated buildA2, and its LiFePO4 cells carry a 3,000+ cycle rating to 80%A3. One review of the family credits it with solid engineering and real portability for people who don't need to power a house, though it isn't certain which RIVER 3 model it describesA4.
“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
BLUETTI AC50B
Reviewers frame the AC50B as genuinely portable, comparing its 14.8 lb favorably with BLUETTI's heavier AC70B2, and in this pairing it's the lighter of the two as well. Its charging story is a strength: about 3 hours on standard AC, or 1.25 hours with BLUETTI's optional 480W Turbo chargerB3. Reviewers also flag the 700W inverter with 1,000W Power Lifting as its headlineB1. Long-term owner reports are not yet in our ledger.
“A 448Wh LiFePO4 battery with 700W output (1,000W Power Lifting), rated for 2,500+ cycles to 80% — years of reliable use.”
Sources
amazon.com · backuppowerhub.com · the-gadgeteer.com · t3.com · bluettipower.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
- Largest RIVER 3 capacity (up to 858Wh), quiet IP54 build, and 3,000-cycle LFP are the standout points. [RIVER 3 MAX · 3 entries]
- Affordable, genuinely portable LFP unit with 700W output, 3,000+ rated cycles (BLUETTI), fast Turbo charging, and B80 support in Power Bank Mode (recharge, not expansion). [AC50B · 3 entries]
- A2
“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]
- A3
“LiFePO4 chemistry rated for 3,000+ cycles to 80% — roughly a decade of everyday use.”
backuppowerhub.com / amazon.com — RIVER 3 line · 2026 · [positive]
- A4
“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]
- B1
“A 448Wh LiFePO4 battery with 700W output (1,000W Power Lifting), rated for 2,500+ cycles to 80% — years of reliable use.”
amazon.com / backuppowerhub.com — AC50B review · 2026 · [positive]
- B2
“At 14.8 lbs it's meaningfully lighter than the AC70 (21.4 lbs) — a genuinely portable sub-15-lb unit with a long-cycle battery and 700W output at an easy-to-justify price.”
backuppowerhub.com / the-gadgeteer.com — AC50B review · 2026 · [positive]
- B3
“Standard AC charging is about 3 hours, dropping to 1.25 hours with the optional 480W Turbo charger; 0-80% in 45 minutes.”
amazon.com / t3.com — AC50B review · 2026 · [positive]
- B4
“The B80 can add 806Wh, but BLUETTI scopes this to "capacity expansion with B80 battery in Power Bank Mode" over an Aviation-to-XT60 cable — the pack recharges the unit rather than extending it as one system, so this is not expandability in the sense this site uses. At $279 it is BLUETTI's most affordable LiFePO4 station.”
bluettipower.com AC50B FAQ (primary) · 2026 · [positive]
Research compiled November 1, 2026.
Who Should Buy Which
Buy the RIVER 3 MAX if you…
- →The CPAP user who wants to wake up with hours of battery to spare rather than single digits.
- →The camper or tailgater running a lamp, a fan and a phone charger at once, who needs three AC sockets more than the lighter carry.
- →Anyone protecting a desktop PC or router on UPS duty, where the ≤10ms rating is the safer class.
Buy the AC50B if you…
- →The hiker or cyclist for whom 3.3 lb matters more than 124Wh, and who'd rather carry 14.8 lb than 18.1.
- →The person whose real reason for buying is a kettle or small heater, and who wants Power Lifting to run it at all.
If neither fits
Anyone trying to carry a fridge, lights and internet through an 8-hour blackout. That list needs 1,645Wh and these hold 572Wh and 448Wh. Close this tab and look at stations sized in the kilowatt-hours, not the hundreds.
The Bottom Line
Buy the RIVER 3 MAX. It's the cheaper unit and the bigger battery at once, and on a CPAP night that adds up to about 4 hours of spare against the AC50B's hour and a half.
The AC50B is a fine little box for a lighter pack or a kettle on a camp table. If that's not you, go get the EcoFlow.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Is the RIVER 3 MAX better than the BLUETTI AC50B?
For most buyers, yes. It's $80 cheaper at typical prices, holds 572Wh against 448Wh, and takes 220W of solar against 200W. The AC50B is the better pick only if you want the lighter carry, 14.8 lb against 18.1, or need to run a resistive appliance through Power Lifting.
Which one charges faster from solar?
It depends what you mean by faster. The RIVER 3 MAX takes more power in, 220W against 200W, so every hour of sun puts more energy into it. The AC50B reaches full a little sooner, about 2.2 hours of ideal sun for its 448Wh against about 2.6 for the RIVER's 572Wh, because it has less to fill. Both figures are best cases; cloud and panel angle stretch them.
Can the AC50B run a kettle or space heater?
Within limits. Power Lifting lets its 700W inverter run a resistive appliance rated up to 1,000W by supplying less power than it asks for, so a kettle boils more slowly. It doesn't help a fridge compressor or power tool, and the RIVER 3 MAX has no equivalent mode.
Which is better for a CPAP overnight?
The RIVER 3 MAX. Against a 320Wh CPAP night it finishes with 166Wh in reserve, about 4 more hours at 40W, while the AC50B finishes with 61Wh, about an hour and a half. Both get you through the night.
Can either one be expanded?
Neither. The RIVER 3 MAX is a RIVER 3 Plus already carrying the one extra battery it accepts, so it stays at 572Wh. The AC50B is fixed at 448Wh; BLUETTI's B80 pack attaches in Power Bank Mode and recharges it rather than extending it, per BLUETTI's own FAQ.
Brand matchup
EcoFlow vs BLUETTI: measured across every matchup →Related comparisons
Where to buy
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EcoFlow RIVER 3 MAXPick
$319.00
$319.00 · direct from EcoFlow
Last checked 28 days ago. Prices move — check before you buy.
BLUETTI AC50B
$399.00
$399.00 · direct from BLUETTI
Last checked 28 days ago. Prices move — check before you buy.
Prices may vary by retailer and are subject to change.