Head-to-head test
EcoFlow RIVER 3 vs BLUETTI AC50B
The RIVER 3 has left EcoFlow's store, so the AC50B is the only one you can buy, and it's also the only one that finishes a 320Wh CPAP night; its seven extra pounds are almost all battery.
Full profiles: EcoFlow RIVER 3 → · BLUETTI AC50B →
Written by Wenny ZhengUpdated
Portable Power Tester, Station Arena Test Desk
Spec deltas
EcoFlow has dropped the base RIVER 3 from its store, so this page has one buyable answer: the BLUETTI AC50B. The RIVER 3's specs still hold, and they're compared below for anyone who owns one or spots it on a retailer shelf, but the recommendation runs one way. If the RIVER 3's small size is what brought you here, the RIVER 3 PLUS is the smallest RIVER 3 EcoFlow still sells, and that's the matchup to check next.
The AC50B is the bigger unit everywhere it counts: 448Wh to 245, 700W continuous to 300, 200W of solar input to 110. It pays for that in three places. It weighs 14.8 lbs to the RIVER 3's 7.8, it has one AC outlet to two, and its USB-C ports top out at 65W where the RIVER 3's does 100W. The weight sounds worst and matters least, because the extra seven pounds is almost all battery.
That battery earns its keep on one job: a 320Wh CPAP night, which the AC50B finishes with 61Wh to spare and the RIVER 3 doesn't. Both handle an afternoon of phones and a laptop. Neither comes close to a blackout or a camping weekend. So the AC50B is the right box for small loads that have to last until morning, and the wrong one for anything bigger.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
weight
And that battery lands exactly where a CPAP night needs it. A 320Wh night sits between the two units' usable energy, so the extra weight is the difference between running dry about two-thirds of the way to morning and waking up with 61Wh left.
RIVER 3: 245Wh, 7.8 lbsAC50B: 448Wh, 14.8 lbsCPAP Overnight needs 320Wh: RIVER 3 has 208Wh usable and falls 112Wh short; AC50B has 381Wh usable and finishes with 61Wh to spare
Why it mattersAnyone powering a CPAP should read the AC50B's weight as the cost of finishing the night, not as a portability penalty.
continuous output
Output isn't stamina, though. At a full 700W the AC50B's 381 usable watt-hours last about half an hour (381 over 700), which is why it holds a 400W tailgate load and still runs out 289Wh early. Its 700W is for short, hot jobs, and the 1,000W Power Lifting figure only stretches that to slower-running heaters and kettles, never to motors.
AC50B: 700W continuous, no surge figure published; Power Lifting runs resistive loads rated up to 1,000WRIVER 3: 300W continuous, 600W surgeTailgate Party needs 670Wh at a 400W peak: the AC50B holds the peak but lands 289Wh short
Why it mattersBuy the AC50B for short bursts above 300W; anyone planning hours of 400W draw needs a larger station, not this one.
solar input
So the AC50B's bigger battery doesn't cost a longer solar day. It refills in the same window of good sun, and on a wall outlet reviewers put it at about 3 hours, or 1.25 with BLUETTI's optional 480W Turbo chargerB3. Nearly twice the stored energy, recovered in the same afternoon.
AC50B: 200W solar input, 448WhRIVER 3: 110W solar input, 245WhAC50B standard AC charge about 3 hours, 1.25 hours with the optional 480W Turbo chargerB3
Why it mattersCampers with a panel give up nothing on recharge time by stepping up to the AC50B's bigger battery.
The specific dimensions that decide these two units — everything else is a tie.
Your Life, Your Pick
Selected because: A 320Wh CPAP night is the one job that splits them: the AC50B finishes it, the RIVER 3 doesn't, and every larger scenario defeats both.
Seven scenarios, and the AC50B wins exactly one outright. It happens to be the one that matters at this size. A 320Wh CPAP night needs more than the RIVER 3's 208 usable watt-hours and less than the AC50B's 381, so the BLUETTI finishes with 61 to spare and the EcoFlow quits about two-thirds of the way to morning. An afternoon of phones and a laptop, 100Wh, is easy for both.
Everything else is a different class of job. A remote workday needs 910Wh, an 8-hour blackout 1,645, a camping weekend 2,100, a van-life day 4,685. The AC50B covers 42% of the first and less of the rest. Those rows aren't a contest between these two; they're the page telling you to shop a bigger station.
Portability & Form Factor
Selected because: Weight is the AC50B's real cost, 14.8 lbs to the RIVER 3's 7.8, and this is where it gets weighed against what it carries.
weight
Seven pounds is the price of the bigger battery, and it buys almost exactly that: the RIVER 3 carries about 31 watt-hours per pound, the AC50B about 30. Neither is hauling dead weight. The AC50B is simply the bigger box.
In the hand, that's the difference between a unit that rides in a tote with the snacks and one that gets its own hand on the walk from the car. At 14.8 lbs it's still an easy one-person carry. If you'll be carrying it any real distance on foot, weight is the one place the AC50B loses, and with the RIVER 3 gone from EcoFlow's store, the RIVER 3 PLUS is the smaller EcoFlow to weigh against it.
What the Specs Don't Tell You
Selected because: Power Lifting's 1,000W figure, two noise ratings published on opposite conventions, and the warranty terms each read differently than they look.
The 1,000W on the AC50B's spec sheet is the figure most likely to mislead. It belongs to Power Lifting, which runs resistive appliances like kettles and heaters by underfeeding them, and it does nothing for a motor. The record publishes no surge headroom above 700W, so plan any compressor or pump around 700W. The AC50B's continuous rating alone still clears the RIVER 3's 600W peak; it just isn't a 1,000W edge.
Noise and warranty are the quieter catches. BLUETTI publishes the AC50B's 45dB as a best case, while EcoFlow publishes the RIVER 3's 30dB as a ceiling under heavy load, so on paper the RIVER 3 is the quieter box, but the two figures don't subtract into a measured gap. Both records carry five years of warranty, and the AC50B's full term depends on buying direct or registering. Neither changes the verdict, and the noise one is a placement problem: give the AC50B the far end of the cord.
Growth Path
Selected because: Neither unit expands and the RIVER 3 can't be bought from EcoFlow at all, so the AC50B's 448Wh is the size you keep.
solar input
Both are sealed boxes. 245Wh and 448Wh is what you get, permanently. BLUETTI's B80 pack looks like an escape hatch, but BLUETTI's own FAQ scopes it to Power Bank Mode, where it recharges the AC50B rather than joining it as one systemB4. That's a jerry can, not a bigger tank.
So buy the size that covers you now. If 381 usable watt-hours covers your longest night, the AC50B ends the search. If it doesn't, no accessory gets it there, and a larger station is the right buy from the start.
Strengths & trade-offs
EcoFlow RIVER 3
Strengths
- +Lighter by 7 lb
Trade-offs
- –No major technical downsides compared to rival.
BLUETTI AC50B
Strengths
- +Larger battery capacity
- +Higher AC output
- +Faster solar charging
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 seven 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 comes up 1,892Wh short (about 10% 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 comes up 1,437Wh short (about 13% 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
AC50B
The AC50B gets you to the alarm. A 320Wh night sits between these two: the AC50B's 381 usable watt-hours finish it with 61 to spare, while the RIVER 3's 208 run dry 112 short, about two-thirds of the way to morning. Its 45dB published best case is the one thing to manage, and the fix is distance: the far end of the cord, not the nightstand.
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 comes up 702Wh short (about 23% covered), the AC50B 529Wh (42%). 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 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, and they fail in opposite ways. The 400W peak is more than the RIVER 3 can hold: 600W of surge starts it, then the 300W continuous rating cuts in. The AC50B's 700W holds the load fine, but its 381 usable watt-hours land 289 short of the 670Wh this needs. One runs out of muscle, the other out of fuel. A tailgate wants a bigger station than either.
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 comes up 4,477Wh short (about 4% 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
SCN-07 · an afternoon · needs 100Wh
Afternoon Off-Grid
Phones and a speaker at the park, beach, or campsite — the small-unit job description
Either unit
Both cover it with room left over: the RIVER 3 finishes at 48% used, the AC50B at 26%. At this size the decider would normally be the bag, 7.8 lbs against 14.8, except the lighter of the two has left EcoFlow's store. If an afternoon of phones and a laptop is the whole job, the AC50B is more box than you need, and the RIVER 3 PLUS is the smaller EcoFlow to compare.
Battery budget usedlower = more headroom
LOAD Phone Charger (×2) 30W×2h · Bluetooth Speaker 10W×4h
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: AC50B runs 1.9h vs 1h.
$399 list · direct from BLUETTI
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 0–25.4hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–5.1hHigh-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
October 11, 2026
Verdict: the AC50B, on Power Score margin
Buy the AC50B. EcoFlow no longer sells the RIVER 3, which settles the recommendation, but the specs point the same way for anyone whose load is bigger than a phone charge: 381 usable watt-hours against 208, 700W continuous against 300, 200W of solar input against 110. It finishes a 320Wh CPAP night with 61Wh to spare where the RIVER 3 runs out 112Wh short. The cost is weight, 14.8 lbs to 7.8, plus one AC outlet to two. If all you need is an afternoon of phones and a laptop and you'll carry it on foot, compare the AC50B against the RIVER 3 PLUS, the smallest RIVER 3 EcoFlow still sells, before you buy.
Editor-assigned confidence, based on cited owner research and spec analysis.
List prices as of October 11, 2026. The links below open BLUETTI's current price.
$399.00 · direct from BLUETTI
Last checked 16 days ago. Prices move — check before you buy.
Written by Wenny Zheng, Portable Power Tester · Station Arena Test Desk · Updated October 11, 2026
Black Friday · 38 days out
Price to beat:AC50B $279
The lowest we have recorded. A Black Friday price above it is a sale this unit has already had.
Measured Data
Benchmark scores and the full spec record, side by side.
Benchmark scores
Not rated for both units (minimum threshold unmet): Solar Generator.
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 rates 4.1/5 (48th percentile of 24 Personal-class units), and AC50B rates 4.6/5 (78th percentile of 24 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 Is Its Quiet Figure
BLUETTI publishes 45dB as the AC50B's best case, so plan on at least that, about a running refrigerator, and more when it's working hard. The RIVER 3's 30dB is the opposite kind of number, a ceiling EcoFlow reaches under heavy charging and discharging, so the two don't subtract into a measured gap. On paper the RIVER 3 is the quieter box; it's also the one EcoFlow no longer sells. Around 45dB is where sleep starts to suffer, so for a CPAP night on the AC50B the fix is free: put it at the far end of the cord, not on the nightstand.
AC50B: Power Lifting Runs Heaters, Not Motors
Power Lifting lets the AC50B run a resistive appliance rated up to 1,000W from its 700W inverter by feeding it less power than it asks for: the kettle boils, just slower. It covers heaters, kettles and incandescent lamps and does nothing for a compressor, a pump or a power tool. Our record publishes no surge figure above the 700W continuous rating, so 700W is the number to plan a motor around, which still clears the RIVER 3's 600W peak. Either way, a load that size empties 381 usable watt-hours in about half an hour, so this is a feature for a pot of coffee, not an evening of heat.
Warranty: Five Years Each, on Different Terms
Both records carry five years, so the term itself doesn't separate them. What differs is how you get it. The AC50B's is BLUETTI's conditional maximum: up to 5 years, with registration or a direct purchase from BLUETTI, and a shorter term through resellers. The RIVER 3's 5 years is stated plainly on our record, and it's what existing owners have to work with, since EcoFlow no longer sells the unit and offers no parts or service once a warranty ends. Buying the AC50B? Buy it direct or register it the day it arrives.
Full record above — the Test Desk pick is the AC50B.
Check AC50B price →Ownership 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 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 AC50B works out at $0.30/kWh over its rated life. If you already own the RIVER 3, the hardware comparison still holds: over its rated life the RIVER 3 delivers about 735 kWh and the AC50B about 1,344 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 — the wear horizon is identical and decides nothing here.
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
US-based phone, email and chat support covers the RIVER 3's warranty term, but EcoFlow offers no parts or service once a warranty runs out. With the RIVER 3 gone from its store, that term is the whole support story for anyone who owns one.
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 BLUETTI's weak spot: email-heavy, often on China time, and uneven from one claim to the next. Buying direct tends to go better, and on the AC50B it's also how you get the full warranty term rather than the shorter reseller one. Older models can become unrepairable, since some have no spare-parts policy.
Analyst note
Normally the brand column is a tiebreaker. Here it's mostly a question of which support path you're on. The AC50B is a live product with BLUETTI's full, if uneven, support behind it. The RIVER 3 is a product EcoFlow no longer sells, from a maker that offers nothing once the warranty ends. Neither reputation is spotless, so buy the AC50B direct or register it, and keep the receipt.
Growth path
RIVER 3
FIXED CAPACITYFixed at 245Wh, with no expansion — so size it for your needs up front rather than planning to add capacity later.
Accepts up to 110W of solar. Limited to a single portable panel.
Limited ports. You'll likely need a power strip or splitter.
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
Growth only counts if you can still buy in, and the RIVER 3 is no longer sold (EcoFlow points owners to the RIVER 3 PLUS). That leaves the AC50B: it is sealed at 448Wh, so buy the size that covers you now. The RIVER 3's fixed 245Wh still matters if you already own one, but it isn't a reason to pick it over the AC50B.
What Owners Report
Patterns from published owner reports and long-term reviews — every claim cited to its source below.
EcoFlow RIVER 3
What field coverage exists on the RIVER 3 is comparative: reviewers lining it up against the older RIVER 2 and preferring it on nearly every count, with sub-30dB operation, IP54 weather sealing, a faster UPS switchover and a lighter body holding more capacityA1A2A4. Review sites recommend it for camping, van life and home UPS duty where durability and noise matterA3. Our own research note is plain that this is directional review sentiment rather than long-term owner dataA0, and none of it changes the headline: EcoFlow no longer sells it.
“The RIVER 3 operates under 30 dB — EcoFlow calls it 'whisper quiet,' quieter than a library — one of the most significant upgrades over the louder RIVER 2.”
Sources
backuppowerhub.com · ecoflow.com · rv.com · versus.com
BLUETTI AC50B
Reviewers land on portability first with the AC50B: a sub-15-lb LFP unit that still puts out 700WB2. Charging reports put a standard AC refill at about 3 hours, or 1.25 hours with the optional 480W Turbo chargerB3. BLUETTI's own FAQ scopes the B80 battery to Power Bank Mode, recharging the AC50B rather than extending it, so read any 'expandable' listing with that in mindB4. Like the RIVER 3's, this coverage comes from reviews rather than years of owner logsB0B2.
“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
- The RIVER 3 improves on the RIVER 2 across the board — quieter (sub-30 dB), IP54-rugged, faster UPS, more capacity, lighter, and cheaper — a rare strict upgrade. [RIVER 3 · 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]
- A1
“The RIVER 3 operates under 30 dB — EcoFlow calls it 'whisper quiet,' quieter than a library — one of the most significant upgrades over the louder RIVER 2.”
backuppowerhub.com / ecoflow.com — RIVER 2 vs RIVER 3 · 2026 · [positive]
- A2
“Over the RIVER 2, the RIVER 3 adds IP54 waterproofing, a faster UPS switchover, a 2x runtime mode, and a more compact, lighter form factor.”
backuppowerhub.com — RIVER 2 vs RIVER 3 · 2026 · [positive]
- A3
“Recommended as the better buy for most in 2026 — for camping, van life, or home UPS backup, where durability and noise matter, the data consistently favors the RIVER 3.”
backuppowerhub.com / rv.com — RIVER 3 review · 2026 · [positive]
- A4
“Holds more capacity and weighs less than the RIVER 2 while costing less, making it effectively a strict upgrade on the same platform.”
ecoflow.com / versus.com — RIVER 2 vs RIVER 3 · 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 October 11, 2026.
Who Should Buy Which
Buy the RIVER 3 if you…
- →You already own a RIVER 3 and your loads fit inside its 208 usable watt-hours: keep it. Nothing on this page is a reason to replace a unit that already does your job.
- →You've spotted one in retailer stock: the specs below still hold, but EcoFlow no longer sells it and offers no parts or service once a warranty ends, so confirm exactly what the seller's warranty covers before you pay.
- →You wanted the RIVER 3 for its size: the smallest RIVER 3 EcoFlow still sells is the RIVER 3 PLUS, and that's the comparison to run against the AC50B.
Buy the AC50B if you…
- →You run a CPAP off-grid and your machine's night lands around our 320Wh profile: the AC50B gets you to morning with 61Wh left, where the RIVER 3 runs dry.
- →You need short bursts between 300 and 700 watts, or a kettle or small heater through Power Lifting, from a box one person carries without thinking about it.
- →You camp with a panel: the AC50B's 200W solar input refills its 448Wh in about 2 hours of full-rated sun, no longer than the RIVER 3 took to fill a battery barely half the size.
If neither fits
Anyone planning to ride out a real outage, run a remote workday or power a campsite for a weekend should close this tab: an 8-hour blackout alone needs 1,645Wh on our profile, more than four times the AC50B's 381 usable, so shop a much larger station. And if all you ever top up is a phone and a headlamp, a USB power bank does it for a fraction of the weight.
The Bottom Line
Take the AC50B. The RIVER 3 has left EcoFlow's store, and on the one job that separates two units this size, the 320Wh CPAP night, the AC50B finishes with 61Wh in hand while the RIVER 3 runs dry 112 short. Its extra seven pounds are almost all battery, which is exactly what that night needs.
If you'll carry it on foot and never ask more of it than an afternoon of phones and a laptop, line the AC50B up against the RIVER 3 PLUS first. Everyone else: buy the AC50B direct or register it, set it at the foot of the bed, and sleep through to the alarm.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Is the EcoFlow RIVER 3 discontinued?
Yes. EcoFlow has dropped the base RIVER 3 from its store, and the smallest RIVER 3 it still sells is the RIVER 3 PLUS. The RIVER 3's specs still hold for owners and anyone who finds retailer stock, but it can't be bought from EcoFlow, so this page recommends the BLUETTI AC50B.
Can the BLUETTI AC50B run a CPAP all night?
On our 320Wh overnight CPAP profile, yes, with 61Wh of its 381 usable watt-hours left by morning. The RIVER 3 falls 112Wh short of the same night. BLUETTI publishes 45dB as the AC50B's best-case noise figure, so put it at the far end of the power cord rather than on the nightstand.
Can the BLUETTI AC50B run a 1,000W heater or kettle?
Yes, through Power Lifting, but more slowly than a wall outlet would. The mode runs resistive appliances rated up to 1,000W by giving them less power than they ask for, so a kettle takes longer to boil. It does nothing for motors, compressors or pumps, and at a full 700W the AC50B's 381 usable watt-hours last about half an hour.
Can you expand the AC50B with a B80 battery?
Not into one bigger system. BLUETTI's own FAQ scopes the B80 to Power Bank Mode, where it recharges the AC50B rather than extending its capacity. Treat the AC50B as a sealed 448Wh unit and size it for your longest night up front.
Which charges faster from solar, the AC50B or the RIVER 3?
The AC50B takes 200W of solar input to the RIVER 3's 110W, so it pulls more from the same sun. Its battery is bigger in roughly the same ratio, so both refill from empty in about 2 hours at full rated input (448Wh over 200W, 245Wh over 110W). Real-world sun stretches both.
Brand matchup
EcoFlow vs BLUETTI: measured across every matchup →Where to buy
EcoFlow RIVER 3
Left EcoFlow's store
BLUETTI AC50BPick
$399.00
$399.00 · direct from BLUETTI
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