Head-to-head test
EcoFlow RIVER 2 Pro vs BLUETTI AC50B
The RIVER 2 Pro costs less and carries 320Wh more, so the AC50B only makes sense for someone who values 2.4 fewer pounds or a ≤20ms UPS transfer over 71% more battery.
Full profiles: EcoFlow RIVER 2 Pro → · BLUETTI AC50B →
Written by Wenny ZhengUpdated
Portable Power Tester, Station Arena Test Desk
Spec deltas
At typical prices the RIVER 2 Pro costs $349 and the AC50B $399, so the unit with 320Wh more battery is also the one that costs less. That almost never happens in this category. It leaves the AC50B needing a specific reason to win, and it has two, both narrow.
The RIVER 2 Pro brings 768Wh, 800W continuous with a published 1,600W surge, four AC outlets and a 100W USB-C port. The AC50B brings 448Wh, 700W, one AC outlet, two USB-C ports at up to 65W, and no published surge figure. Both are rated for 3,000 cycles in our record, the RIVER carries a 5-year warranty and the AC50B up to 5 years with registration, and neither one expands.
The AC50B's case is 14.8 lbs against 17.2, and a UPS transfer rated ≤20ms against the RIVER's ≤30ms, which is the line where fussier desktop PCs reboot. If you carry the box far more often than you drain it, or it exists to keep a computer alive through flickers, that case holds. Otherwise take the RIVER 2 Pro and keep the $50.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
cost / lifetime kWh
Spread over the rated cycle life, the RIVER's pack delivers 2,304 kWh to the AC50B's 1,344, and each of those kilowatt-hours costs 15 cents against 30. The smaller unit costs twice as much per unit of energy it will ever store, which is the opposite of what a smaller unit is supposed to offer.
RIVER 2 Pro: 768Wh at $349AC50B: 448Wh at $399Both rated 3,000 cycles: 2,304 vs 1,344 lifetime kWhCost per lifetime kWh: $0.15 vs $0.30
Why it mattersAnyone whose loads fit either box should start from the RIVER 2 Pro and make the AC50B earn its way back on weight or UPS speed.
continuous output
Its 1,000W Power Lifting mode looks like headroom and isn't: it feeds a kettle or heater less power than the appliance asks for, and BLUETTI scopes it to resistive loads, so it does nothing for a fridge compressor or a pump. The RIVER publishes a surge of double its continuous rating and has sockets for a lamp, a fan and a router at once.
RIVER 2 Pro: 4 AC outlets, 800W continuous, 1,600W published surgeAC50B: 1 AC outlet, 700W continuous, no published surge figureAC50B Power Lifting: resistive appliances rated up to 1,000W
Why it mattersIf more than one thing plugs into the AC side, or anything with a motor, the RIVER 2 Pro is the box built for the job.
The engine still gives the CPAP row to the AC50B, on its lower published noise rating. EcoFlow's figure is a ceiling under heavy charge or dischargeA2, not what a 40W draw sounds like, so the quieter-on-paper box isn't proven quieter at the bedside. What is proven is the arithmetic: an outage that runs into a second night leaves the AC50B with 61Wh going into bedtime unless it has been recharged.
CPAP Overnight: about 40W for 8 hours, 320WhUsable after the flat 85% derate: RIVER 2 Pro 653Wh, AC50B 381WhEcoFlow publishes the RIVER 2 Pro's noise rating as a maximum reached when charging or discharging at high wattageA2
Why it mattersA CPAP user bridging a single night can take the AC50B on its quieter rating; anyone planning for an outage that lasts two nights needs the RIVER 2 Pro.
weight
768Wh over 17.2 lbs is about 45Wh a pound; 448Wh over 14.8 lbs is about 30. The lighter box is the less energy-dense one, so the 2.4 lbs you save cost 320Wh, roughly 133Wh for every pound.
AC50B: 14.8 lbs, 448WhRIVER 2 Pro: 17.2 lbs, 768Wh
Why it mattersOnly someone who carries the unit far more than they use it, like a day-trip picnic kit, should let weight decide.
The specific dimensions that decide these two units — everything else is a tie.
Lifetime Value
Selected because: The cheaper unit is also the bigger one, so per lifetime kWh the AC50B costs twice as much.
cost / lifetime kWh
Fifteen cents a lifetime kilowatt-hour against thirty. The RIVER 2 Pro gets there by being cheaper and bigger at once, which leaves the AC50B paying double for every kilowatt-hour its pack will ever hold. Both are rated for 3,000 cycles in our record, so the gap is capacity and price, not durability.
The honest catch: lifetime kWh is a long-run figure, and few people at this size cycle a pack daily for 8 years. If you'd use either one a few weekends a year, ignore the per-kWh line and look at the sticker. It points the same way.
Your Life, Your Pick
Selected because: Five of six rows go to neither, so the useful read is how close each unit gets, plus the one row the AC50B takes.
Five of the six rows go to neither, which makes the near-misses the useful part. The RIVER 2 Pro lands 17Wh short of the tailgate list and covers about 72% of a remote workday; the AC50B is 289Wh and 529Wh short of the same two. Those extra 320Wh are the difference between switching off one load and abandoning half the plan.
The one row the AC50B takes is CPAP Overnight, on its lower published noise rating, and both units pass it comfortably. Weekend camping, an 8-hour blackout and van life are past both: the RIVER 2 Pro covers about 40% of the blackout, the AC50B 23%.
What the Specs Don't Tell You
Selected because: UPS speed and Power Lifting are where the AC50B's case lives, and both are narrower than they look.
The AC50B's whole case sits in these cards. Its UPS transfer is rated ≤20ms against the RIVER's ≤30ms, both ceilings rather than measurements, and that matters for a desktop PC and not at all for a router. Power Lifting runs a kettle or heater rated up to 1,000W by feeding it less power, which is useful if the kettle is the reason you're buying and irrelevant to anything with a compressor.
Noise is a draw on paper. EcoFlow publishes the RIVER 2 Pro's rating as a maximum at high wattage, BLUETTI publishes a best case, and neither number tells you what either box does at a light load. Warranty is a wash at 5 years, with the AC50B's term depending on buying direct or registering.
Portability & Form Factor
Selected because: The 2.4 lb difference is the AC50B's most tangible advantage.
weight
Both are a one-person carry with room to spare, so this is a convenience gap, not a capability one. It matters to the buyer who hauls the box to a picnic table every weekend and never drains it. For anyone who carries it to the garage once and runs it there, the RIVER's extra 2.4 lbs is the cheapest weight in the comparison.
Strengths & trade-offs
EcoFlow RIVER 2 Pro
Strengths
- +Costs $50 less
- +Larger battery capacity
- +Higher AC output
- +Faster solar charging
Trade-offs
- –Can receive complaints about fan noise under heavy load.
BLUETTI AC50B
Strengths
- +Lighter by 2.4 lb
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 2 Pro comes up 1,447Wh short (about 31% 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 2 Pro comes up 992Wh short (about 40% 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
Either unit
A CPAP is about 40W for eight hours, so both cover the night, though not twice: the AC50B gets through it with 61Wh to spare. The only published difference is fan noise, and it can't settle this: the AC50B is rated 45dB and the RIVER 2 Pro 62dB, but the AC50B's is its maker's best case and the RIVER 2 Pro's is EcoFlow's maximum under heavy charge and discharge, so at a 40W draw the real gap can only be narrower than it looks, and may even run the other way. Neither settles which box is quieter at a bedside. Buy whichever is cheaper or easier to carry.
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 covers the full 910Wh day. The RIVER 2 Pro gets through about 72% of it and stops 257Wh short; the AC50B manages 42% and is done before the day is half over. If a workday off the grid is the plan, the RIVER is partial cover and the AC50B is a head start.
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 finishes the 670Wh list, but the misses aren't alike. The RIVER 2 Pro runs out 17Wh short, which is one small load switched off near the end. The AC50B is 289Wh short and gets through a bit over half the list. The engine calls it for neither; the RIVER is the one that gets there with a little discipline.
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 2 Pro comes up 4,032Wh short (about 14% 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 2 Pro runs 3.2h vs 1.9h.
$349 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 0–43.5hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–8.7hHigh-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 RIVER 2 Pro
Take the RIVER 2 Pro. At typical prices it costs $50 less than the AC50B and carries 768Wh to 448Wh, four AC outlets to one, and a published 1,600W surge where BLUETTI publishes no surge figure at all. The AC50B wins two specs outright, 2.4 lbs of weight and a UPS transfer rated ≤20ms against ≤30ms, and it takes the CPAP row on a lower published noise rating that isn't measured the same way as the RIVER's. Buy it only if carrying it or protecting a desktop PC is the whole point of the purchase.
Editor-assigned confidence, based on cited owner research and spec analysis.
List prices as of October 11, 2026. The links below open EcoFlow's and BLUETTI's current prices.
$389.00 · 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 October 11, 2026
Black Friday · 26 days out
Prices to beat:RIVER 2 Pro $349AC50B $279
The lowest we have recorded for each. We have never seen the RIVER 2 Pro 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
Not rated for both units (minimum threshold unmet): UPS.
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 2 Pro rates 4.7/5 (84th 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.
Fan Noise: Two Published Ratings
The AC50B is rated 45dB (like a running refrigerator), the RIVER 2 Pro 62dB (like a normal conversation). Neither is a measurement on a shared bench — and the two are not even the same kind of figure: the RIVER 2 Pro'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 narrower than the numbers suggest, and may even run the other way. Take the pair as a prompt to find hands-on reports rather than as a gap you can act on. For most people, fan noise around 45dB and up is where sleep starts to suffer, and neither figure tells you what either unit does at a 40W draw.
AC50B: Power Lifting Boils a Kettle, Not a Compressor
BLUETTI's Power Lifting runs a resistive appliance rated up to 1,000W from the AC50B's 700W inverter by feeding it less power than it asks for. The kettle still boils, just slower. BLUETTI scopes it to heaters, kettles and similar resistive loads, so it does nothing for a fridge compressor, a pump or a power tool, and this record carries no surge figure for the AC50B, so don't read 1,000W as starting headroom. The RIVER 2 Pro has no equivalent mode, but it does publish 1,600W of surge over its 800W continuous rating, which is the number that matters when a motor kicks on.
UPS: The AC50B's Cleanest Win
Both list a UPS mode, and this is the one spec where the AC50B is plainly ahead on paper: a transfer rated ≤20ms against the RIVER 2 Pro's ≤30ms. Both are ceilings, not bench results. A router or modem rides through either. A desktop PC is different, since ≤30ms is a transfer many power supplies won't ride through, so if a computer with unsaved work is the reason you're buying, the AC50B's rating is the reason to pick it.
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.
Full record above — the Test Desk pick is the RIVER 2 Pro.
Check RIVER 2 Pro 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 2 Pro wins on both sticker price and long-term value. At $0.15/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 $0.15 less — check the RIVER 2 Pro 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
Tested subscription paywalls for advanced app features in early 2025 before community backlash paused the plan. No parts or service offered out of warranty.
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
Customer support inconsistency is the #1 risk factor. Older/discontinued units may become unrepairable — no spare parts policy for some models. Some reports of erratic communication from support agents.
Analyst note
Neither brand's support record is spotless, and both reward buying in the right place. EcoFlow's return safety net is stronger through Costco or Amazon. BLUETTI's support tends to go better when you buy direct, which matters twice here, because the AC50B's 5-year term applies to direct or registered purchases and reseller purchases carry a shorter one.
Growth path
RIVER 2 Pro
FIXED CAPACITYFixed at 768Wh, 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 2 Pro 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 2 Pro
RIVER 2 Pro field data is thin: our research found only four entries it could tie to this exact model rather than the wider RIVER 2 lineA0. The one pattern is fan noise under heavy load. EcoFlow's own footnote says the RIVER 2 Pro can reach 62dB when charging or discharging at high wattageA2, and one owner who fixed a noisy RIVER 2 fan repeated the mod on his RIVER 2 Pro, cutting away internal plastic to make it fitA1.
The rest is questions rather than answers. One owner asked whether running it as a UPS affects battery life, and our ledger holds the question, not a replyA3. The only CPAP entry is a week-one CPAP user in a van, posting in a RIVER 2 Pro thread, whose AirSense 11 already runs overnight off an existing battery bank through a DC cableA4, so it says little about this unit.
“Will using River 2 Pro as a UPS affect battery life ...”
Sources
ctrl-alt-rees.com
BLUETTI AC50B
The AC50B's ledger is reviewer evidence rather than long-term owner reportsB0B2B3. Reviewers single out the weight, calling 14.8 lbs meaningfully lighter than BLUETTI's own AC70 at 21.4 lbs and a genuinely portable unitB2. They also report about 3 hours on standard AC charging, 1.25 hours with the optional 480W Turbo charger, and 0 to 80% in 45 minutesB3.
Two things to discount. BLUETTI's own FAQ scopes the B80 battery to Power Bank Mode, where it recharges the AC50B rather than extending it as one systemB4, so the B80 is not expansion. And one review quotes the pack at 2,500+ cyclesB1, below the 3,000 our record carries; at the lower figure the RIVER's lead on lifetime energy only widens.
“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
- Fan noise at high wattage charging/discharging is a consistent owner and manufacturer-acknowledged complaint, severe enough that some owners physically mod the unit with quieter fans. [RIVER 2 Pro · 2 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
“I've since performed the same mod on my RIVER 2 PRO and it works great for that unit, too - although it did involve cutting away some of the internal plastic.”
ctrl-alt-rees.com blog — 'EcoFlow RIVER 2 Noisy Fan Fix!' · 2022-11-17 · [negative]
- A2
“When charging and discharging at high wattage, RIVER 2 Max and RIVER 2 Pro may make a noise up to 62db.”
EcoFlow official product page — RIVER 2 Series specs/FAQ footnotes · unknown · [negative]
- A3
“Will using River 2 Pro as a UPS affect battery life ...”
Facebook — EcoFlow Club group post title · unknown · [mixed]
- A4
“I'm very new to CPAP (1 week) and I live in a van. I have solar and a decent battery bank and I've got the ResMed DC-DC cable which powers my AirSense 11 AutoSet overnight no problem.”
Apnea Board forum — '[Equipment] EcoFlow River 2 Pro' thread · 2025-07 · [mixed]
- 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 October 11, 2026.
Who Should Buy Which
Buy the RIVER 2 Pro if you…
- →The evening-outage household: router, lamp and fan plugged straight into four AC sockets, drawing on 653Wh usable, from the box that costs less.
- →The CPAP user planning for an outage that runs into a second night: two 8-hour nights at 40W take 640Wh, and the RIVER has 653Wh usable.
- →The tailgater running a speaker, lights and phone chargers at once, who would rather finish 17Wh short than 289Wh short.
- →Anyone charging a laptop that wants a full 100W over USB-C.
Buy the AC50B if you…
- →The day-tripper who carries it to a picnic table or a boat far more often than they drain it, and feels every one of the 2.4 lbs.
- →The home office guarding a desktop PC through brief flickers, who wants a transfer rated ≤20ms rather than ≤30ms.
- →Someone whose one big load is a kettle or small heater, which Power Lifting will run up to 1,000W at reduced power.
If neither fits
If the plan is a camping weekend, a full 8-hour blackout or living in a van, close this tab. The RIVER 2 Pro covers about 40% of our blackout scenario and the AC50B 23%; look at a station rated well above the 1,645Wh that blackout needs instead of stretching either of these.
The Bottom Line
Take the RIVER 2 Pro. It's the cheaper of the two and the bigger one, which leaves the AC50B costing twice as much per lifetime kilowatt-hour while offering one AC outlet to the RIVER's four and no published surge figure.
The AC50B earns its place for exactly two people: the one who carries it far more than they use it, and the one protecting a desktop PC who wants the ≤20ms transfer rating. If that isn't you, keep the $50 and take the 320Wh.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Is the EcoFlow RIVER 2 Pro better than the BLUETTI AC50B?
For most uses, yes. At typical prices the RIVER 2 Pro costs $50 less and carries 768Wh to the AC50B's 448Wh, with four AC outlets to one and a published 1,600W surge. The AC50B is 2.4 lbs lighter and has the faster-rated UPS transfer, and those are the only reasons to pick it.
Which is better for a CPAP, the RIVER 2 Pro or the AC50B?
For one night, either works and the AC50B carries the lower published noise rating. That rating isn't comparable to EcoFlow's, which is published as a maximum when charging or discharging at high wattage, not at a CPAP's 40W. For an outage longer than one night, the RIVER 2 Pro covers two 8-hour nights where the AC50B covers one with 61Wh to spare.
Can the BLUETTI AC50B be expanded with the B80 battery?
Not in the sense of adding capacity to one system. BLUETTI's own FAQ scopes the B80 to Power Bank Mode, where it recharges the AC50B over a cable rather than extending it. The RIVER 2 Pro doesn't expand either, so buy the size you need on day one.
Does Power Lifting mean the AC50B can run a 1,000W appliance?
Only a resistive one, like a kettle or a heater, and only at reduced power, so it heats more slowly. It does nothing for a fridge compressor, a pump or a power tool, and BLUETTI publishes no surge figure for the AC50B. If a motor needs starting, the RIVER 2 Pro's published 1,600W surge is the relevant number.
Which one is better as a UPS for a computer?
The AC50B, on paper: its transfer is rated ≤20ms against the RIVER 2 Pro's ≤30ms. Both are ceilings, not lab results. A router or modem rides through either; a desktop PC with a fussy power supply is where the AC50B's rating earns its keep.
Brand matchup
EcoFlow vs BLUETTI: measured across every matchup →Where to buy
EcoFlow RIVER 2 ProPick
$389.00
$389.00 · 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.