Head-to-head test
EcoFlow RIVER 3 vs Anker SOLIX C300X
You're paying $91 more for the Anker to get 43 more watt-hours, a 140W USB-C port, and a 10-millisecond-faster switchover, and for most people buying a sub-300Wh box that's real money for refinements they'll never feel.
Written by Wenny ZhengUpdated
Portable Power Tester, Station Arena Test Desk
EcoFlow
RIVER 3
1,511Power Score · Device Hub
$239.00 · direct from EcoFlow
Last checked 6 days ago. Prices move — check before you buy.
Anker
SOLIX C300X
1,638Power Score · Device Hub
$299.99 · direct from Anker
Last checked 6 days ago. Prices move — check before you buy.
Spec deltas
The RIVER 3 is $209 and the Anker SOLIX C300X is $300, and that $91 gap is the whole decision. On the spec sheet these two nearly rhyme: both push 300W, both are LiFePO4 rated for 3,000 cycles, both carry five-year warranties, both are one-handed carries. What the extra money buys is 43 more watt-hours, a 140W USB-C port instead of 100W, and a switchover that's 10 milliseconds quicker.
For most buyers of a box this size, that's a premium without a payday. Forty-three watt-hours is about one extra phone charge and change, and you will not notice a 20-millisecond switchover shrink to 10 unless you're backing a desktop PC that's fussy about transfer time, which most aren't. The RIVER 3 does the identical everyday job, phones and a laptop and camp lights and part of a night on a CPAP, and hands you back the difference.
Where the Anker earns its keep is narrow but real. Its 140W USB-C port fast-charges a 16-inch laptop the RIVER 3's 100W can't quite feed, and testers called it near-silent even under loadB4, a shade quieter than the RIVER 3's already-library-quiet sub-30dBA1. If either of those is why you're shopping, pay the premium. If not, this one's about the money, and the RIVER 3 keeps more of it.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
You pay the premium up front and never earn it back in use, because the two cost within pennies of each other to run. The extra money is pure acquisition cost for 43Wh you could match on the RIVER 3 by plugging in ten minutes sooner.
RIVER 3 $209 vs C300X $300, same 300W output and 3,000 cyclesRIVER 3 costs $0.28 per lifetime kWh vs the C300X's $0.35Both carry the same five-year warranty
Why it mattersIf you're deciding on price, and at this size most people are, the RIVER 3 is the buy and the C300X has to win you on something specific.
For a 13- or 14-inch laptop, 100W is already full speed and the ports tie. For a 16-inch MacBook Pro or a gaming laptop that wants 140W, the C300X keeps it topped up under load while the RIVER 3 falls behind, the one everyday task where the Anker's premium buys something you feel daily.
C300X USB-C tops out at 140WRIVER 3 USB-C tops out at 100WA 16-inch MacBook Pro ships with a 140W charger
Why it mattersHeavy-laptop users have the one solid reason to pay up; phone-and-tablet users don't.
Capacity
If your real use is an overnight appliance or days off-grid, 245Wh versus 288Wh is the wrong argument; both come up short and you want a 500Wh-and-up unit. The capacity gap only bites inside the thin band where 288Wh is enough and 245Wh isn't.
C300X holds 288Wh, RIVER 3 holds 245WhA typical CPAP night runs about 320WhNeither unit finishes a weekend-camping or 8-hour-blackout load in our scenarios
Why it mattersBuyers eyeing overnight or multi-day runtime should skip both and size up, not split hairs over 43 watt-hours.
The specific dimensions that decide these two units — everything else is a tie.
Lifetime Value
Selected because: cheaperToOwn is p1 ($0.28 vs $0.35) and price is the axis that settles the matchup; lead with it.
cost / lifetime kWh
The cheaper box to buy is also the cheaper box to own, which doesn't always follow. $209 buys 735 kilowatt-hours across the RIVER 3's 3,000-cycle life at $0.28 each; the C300X's larger battery delivers 864 kilowatt-hours, but at $300 that lands at $0.35 per kilowatt-hour. Same five-year warranty, same chemistry, same cycle count. The Anker just costs more per unit of energy at every point in its life, so there's no lifetime-cost case for the premium. It has to come from features.
PowerScore Breakdown
Selected because: 1666 vs 1605 captures the C300X's capacity/USB-C/UPS edge, with the honest asterisk that you pay $91 for a bundle most buyers half-use.
overall power score
Our PowerScore gives the C300X the edge, 1666 to 1605, and it's honest about where that comes from: 43 more watt-hours, 140W USB-C to the RIVER 3's 100W, and a 10ms line-interactive switchover against 20ms. Real advantages, all of them. What the composite can't price in is that you're buying the bundle for $91, and three of those four edges are ones a phone-and-camp-light user never touches. The score says better unit; your receipt decides whether better is worth it here.
What the Specs Don't Tell You
Selected because: ups (10ms vs 20ms) and warranty (tie at 5yr) both fire; both are minor and both the Anker's to claim.
Both flags are minor and both are the Anker's. Its switchover is line-interactive at 10 milliseconds to the RIVER 3's 20, which matters only if you're backing a desktop that can't ride out a 20ms blink, and most can. The warranty is a dead tie at five years, so it breaks nothing. Neither is a reason to move the money; they're tiebreakers for a buyer who's already decided the capacity and the ports are worth it.
Brand Trust
Selected because: Cross-brand: EcoFlow's deep catalog and big community vs Anker's parent-brand trust and slipping SOLIX support.
EcoFlow brings the deepest catalog in portable power and the largest owner community in the category, plus the fastest-charging tech going, against a support record reviews describe as polarized and a 2025 DELTA Max recall worth reading up on. Anker counters with parent-brand trust banked over a decade of chargers and cables, and InfiniPower cells built for long life, though SOLIX-specific support looks to be sliding from the company's historically excellent standard and firmware updates have pulled features without notice. For a sub-$300 unit you'll mostly self-support, both are safe, and EcoFlow's community is the better free help desk.
Strengths & trade-offs
EcoFlow RIVER 3
Strengths
- +Costs $61 less
- +Lighter by 1.2 lb
- +Faster solar charging
Trade-offs
- –No major technical downsides compared to rival.
Anker SOLIX C300X
Strengths
- +Larger battery capacity
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
A weekend's worth of draw is several times what either box holds, so this isn't a contest either one wins; it's a sign you're looking at the wrong size. Both are day-trip and device-charging units, not weekend-power units. If a full weekend off-grid is the plan, neither 245Wh nor 288Wh gets you there, so size up and don't let the 43Wh gap between them distract you.
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 SOLIX C300X 1,400Wh (15%). 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
Neither unit
Neither finishes a full humidifier-on CPAP night; a 320Wh load outruns even the bigger 288Wh Anker, and the 245Wh RIVER 3 falls a little further short. What separates them here isn't capacity, it's the fan two feet from your head, and the C300X is the quieter of two quiet units. Run the humidifier and you want a bigger box; leave it off and either coasts to morning, the Anker more silently.
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 SOLIX C300X 665Wh (27%). 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 unit can hold the 400W peak this scenario needs — the RIVER 3 on its 300W continuous rating, the SOLIX C300X on its 300W, so capacity never gets a say. This is the wrong size of unit for the job rather than a close call.
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 SOLIX C300X 4,440Wh (5%). 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
This is the job small stations are actually for, and both do it: the RIVER 3 finishes at 48% used, the SOLIX C300X at 41%. At this size the decider is what rides in the bag — 7.8 lbs for the RIVER 3 against 9 for the SOLIX C300X — and price, not the leftover watt-hours.
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: SOLIX C300X runs 1.2h vs 1h.
$299.99 list · direct from Anker
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 0–16.3hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–3.3hHigh-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
July 18, 2026
Verdict: the RIVER 3
The RIVER 3 is the value pick at $209 to the Anker's $300, and the cheaper unit to own: $0.28 per lifetime kilowatt-hour against $0.35, on the same 3,000-cycle rating and the same five-year warranty. The C300X is genuinely the nicer box, with 288Wh to 245, a 140W USB-C port to the RIVER 3's 100W, a 10ms line-interactive switchover against 20ms, and a higher PowerScore at 1666 to 1605. None of that is worth the premium to a buyer charging phones, a laptop, and a couple of camp lights. Pay up for the Anker only if you specifically need 140W laptop charging or the quietest unit at the bedside, where testers found it near-silent even under loadB4. Everyone else keeps the difference.
Editor-assigned confidence, based on cited owner research and spec analysis.
List prices as of July 18, 2026. The links below open EcoFlow's and Anker's current prices.
$239.00 · direct from EcoFlow
Last checked 6 days ago. Prices move — check before you buy.
or check the SOLIX C300X price$299.99 list
Written by Wenny Zheng, Portable Power Tester · Station Arena Test Desk · Updated July 18, 2026
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 rates 4.1/5 (48th percentile of 22 Personal-class units), and SOLIX C300X rates 4.7/5 (81st percentile of 22 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.
10ms vs 20ms: real, rarely cashed
The C300X switches over in 10 milliseconds to the RIVER 3's 20, and on paper that's the Anker's win. In practice a 20ms gap sits inside what most desktop power supplies ride out without blinking, so unless you're backing a machine you already know is twitchy about transfer time, both keep a PC alive through an outage. It's a genuine spec edge that most buyers never actually spend.
Warranty: No Difference
Both units carry the same 5-year warranty, so coverage isn't a tiebreaker here. Worth saying because the per-dollar framing can suggest otherwise: the RIVER 3 works out at 20.9 years of cover per $1,000 spent against the SOLIX C300X's 16.7, but that spread is the price gap, not the terms.
Full record above — the Test Desk pick is the RIVER 3.
Check RIVER 3 price →or check the SOLIX C300X 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
Both units have similar long-term ownership costs ($0.33/kWh vs $0.35/kWh). The price difference is what you see on the sticker — neither is a hidden bargain or rip-off. 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
The deepest catalog in portable power and the largest owner community in the category, a dozen-plus models backed by a subreddit that doubles as a free help desk.
Support
US-based, but the experience is a coin flip: plenty of hassle-free prepaid-label swaps, and a real minority reporting long waits or refurbished units on new claims. Buying through Costco or Amazon gives you a sturdier return 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 very top of the range, the DELTA Pro Ultra platform stacks batteries and inverters into whole-home backup — a flagship path, not a line-wide feature.
Worth knowing
Fastest-charging tech in the class and the most aggressive release cadence, offset by a 2025 DELTA Max recall worth reading up on and no out-of-warranty service.
Anker
Ecosystem
A tighter SOLIX lineup riding on Anker's decade of consumer-electronics trust: fewer models than EcoFlow, but a brand most people already own something from.
Support
Historically famous for no-questions replacements, though SOLIX-specific service looks to be sliding, with AI-driven first-line agents and awkward hazmat logistics on heavier units. The parent-brand reputation is still real.
Community
Moderate — active Reddit (r/Anker, r/AnkerSOLIXCommunity) and growing. Benefits from Anker's massive consumer electronics brand awareness.
App experience
Rated 4.5/5 iOS (~1,100 ratings) · 4.3/5 Android
Unique strength
Parent brand trust from Anker's consumer electronics dominance. InfiniPower technology for long cycle life. Strong $/Wh value in the mid-size and larger units — the S2000, F2600 and C1000 are among the better buys per watt-hour in the catalog.
Worth knowing
InfiniPower cells built for long cycle life and some of the best dollar-per-watt-hour value in the market, with the asterisk that firmware updates have removed features without warning.
Analyst note
EcoFlow is the specialist with the deeper bench and the louder community; Anker is the trusted generalist with cleaner value and a support desk that's quietly getting worse. At this price both are safe bets you'll mostly self-support, so pick on the hardware, not the badge.
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.
SOLIX C300X
FIXED CAPACITYFixed at 288Wh, with no expansion — so size it for your needs up front rather than planning to add capacity later.
Accepts up to 100W of solar. Limited to a single portable panel.
Adequate ports for most setups, but heavy users may want a power strip.
Realistic full solar rechargeat 70% of rated panel output — 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 SOLIX C300X 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
The RIVER 3's headline in the field is quiet: sub-30dB running that reviewers pin as one of its biggest upgrades over the older RIVER 2, quieter than a libraryA1. Past that it reads as a strict step forward on EcoFlow's small platform, adding IP54 splash resistance, a faster UPS, a 2x runtime mode, and a lighter, more compact body than the RIVER 2A2. The recurring 2026 recommendation is that for camping, van life, or a home UPS where noise and durability matter, this is the one to buy in the classA3.
“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
Anker SOLIX C300X
The C300X's strongest field notes are about getting power in and keeping it on. Testers pulled the wall plug mid-session with a computer, router, modem, and CPAP all running off it, and nothing flickered; the switchover was imperceptibleB7. Recharge is quick too, with reviewers clocking roughly an hour to full on wall power and an 80% top-up well inside thatB8, and the app's usage history was sharp enough to catch a portable fan pulling twice its expected wattageB10. The honest catch is small and lives in the app: some users hit a Bluetooth pairing dropout that blocks monitoring until you forget-and-repair the deviceB1, and one owner reported a unit that refused to charge past 25%B2. This is a 2026 SKU, so that record is professional-tester hands-on plus a few early owner reports, not years of accumulated field data.
“The unit was confirmed to shut itself off when charging very low-draw devices like headphones or a smartwatch — an intended power-saving cutoff rather than a defect, but one that catches owners off guard.”
Sources
teqclub.com · thesolarlab.com · backuppowerhub.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]
- Independent hands-on reviewers found the C300X near-silent at its rated 300W load, though one test noted the fan becoming noticeably audible under a heavier transient/overload draw. [SOLIX C300X · 2 entries]
- AC charging and UPS switchover both performed at or better than spec in hands-on testing — fast wall recharge and an imperceptible transfer that kept a computer, router, and CPAP running through a pulled plug. [SOLIX C300X · 2 entries]
- The most concrete owner-reported defects both sit in the app/charging pipeline: a Bluetooth pairing dropout that blocks monitoring, and a specific report of the battery refusing to charge past 25%. [SOLIX C300X · 2 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]
- B1
“Users reported trouble connecting the C300X to the Anker app, which blocked monitoring power usage and changing settings; re-pairing by "forgetting" the device in Bluetooth settings and reconnecting through the app usually fixed it.”
teqclub.com — "Solving Common Anker C300X Problems" · unknown · [negative]
- B2
“My Anker solix c300x Portable Power Station will not accept charge more than 25%.”
teqclub.com — "Solving Common Anker C300X Problems" (quoted owner comment) · unknown · [negative]
- B4
“This unit is impressively quiet. Even with the internal fans running when we pushed it to its limits, the C300X makes virtually no noise.”
thesolarlab.com — "Anker C300X Power Station Review" · 2026 · [positive]
- B7
“Pulling the AC plug mid-use while a computer, router, modem, and CPAP machine were running, the computer stayed on without interruption — no screen flicker, no system hiccup.”
backuppowerhub.com — "Anker SOLIX C300X Review" · 2026 · [positive]
- B8
“AC charging to 80% took 49 minutes in testing, matching the advertised claim; full charge landed at 65 minutes. A 100W solar panel took 3 hours 15 minutes, and 12V car charging took about 6.5 hours.”
backuppowerhub.com — "Anker SOLIX C300X Review" · 2026 · [positive]
- B10
“The app's most useful function was over-the-air firmware updates and historical usage data — the reviewer used the history to notice a portable fan was drawing twice the wattage expected.”
backuppowerhub.com — "Anker SOLIX C300X Review" · 2026 · [positive]
Research compiled July 18, 2026.
Who Should Buy Which
Buy the RIVER 3 if you…
- →The value buyer: $209 for a 300W, 245Wh box that does the same daily work as the Anker for less.
- →Phone, tablet, and camp-light users: 100W USB-C already covers everything short of a 16-inch laptop.
- →Quiet-room buyers on a budget: sub-30dB is library-quiet and costs less hereA1.
- →Anyone who wants the largest owner community in the category as a free help desk when something acts up.
Buy the SOLIX C300X if you…
- →Big-laptop owners: the 140W USB-C port fast-charges a 16-inch MacBook Pro the RIVER 3's 100W can't fully feed.
- →The bedside CPAP user who wants the quietest option: testers found it near-silent even under loadB4.
- →Buyers who want the most capacity in the class: 288Wh to the RIVER 3's 245, plus the faster 10ms transfer that held a full desk through a pulled plugB7.
- →Anyone leaning on the app for usage tracking: the history view is genuinely usefulB10.
If neither fits
If your actual need is a full CPAP night, a weekend of camping, or an 8-hour blackout, neither of these finishes the job; a 320Wh night alone outruns both. Step up to a 500Wh-and-up unit and stop shopping the 300Wh shelf.
The Bottom Line
The RIVER 3 wins this on the one axis that splits them: price. $209 to $300, cheaper to own, same warranty and cycle life, doing the same everyday work of phones, a laptop, camp lights, and part of a CPAP night. The C300X is the better-built, better-specced box, and for a big-laptop owner or a light sleeper it's worth the premium; for everyone else it's paying more for headroom they won't reach.
Buy the RIVER 3 and pocket the difference, unless you specifically need 140W USB-C or the quietest unit on the shelf, in which case the Anker has earned itB4.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Is the EcoFlow RIVER 3 or the Anker SOLIX C300X the better value?
The RIVER 3, clearly. It's $209 to the Anker's $300 and cheaper to own at $0.28 per lifetime kilowatt-hour against $0.35, on the same 3,000-cycle rating and the same five-year warranty. The C300X is the nicer unit, but you're paying $91 for 43 extra watt-hours and a few refinements most small-battery buyers won't use.
Does the C300X charge a laptop faster than the RIVER 3?
For a big laptop, yes. Its USB-C port delivers 140W to the RIVER 3's 100W, which is the difference between fast-charging a 16-inch MacBook Pro and trickling it. For a 13- or 14-inch laptop, 100W is already full speed and the two effectively tie.
Which one is quieter?
Both are quiet; the Anker is a touch quieter. Testers called the C300X near-silent even under load, while the RIVER 3 runs sub-30dB, which reviewers still rate as library-quiet. If the unit sleeps two feet from your head the C300X has the edge, but neither is a box you'll hear across a room.
Can either one run a CPAP all night?
Not a full night with the humidifier on. A typical CPAP night runs about 320Wh, and even the 288Wh C300X comes up short on paper, with the 245Wh RIVER 3 shorter still. For heated-humidifier use you want a 500Wh-and-up unit; both are fine for a partial night or a humidifier-off setup.
Is the Anker worth the extra money?
Only for specific needs: 140W laptop charging, the quietest possible bedside unit, or wanting the most capacity in the class at 288Wh. If you're charging phones, tablets, and camp lights, the RIVER 3 does the identical job and leaves the $91 in your pocket.
Where to buy
EcoFlow RIVER 3Pick
$239.00
$239.00 · direct from EcoFlow
Last checked 6 days ago. Prices move — check before you buy.
Anker SOLIX C300X
$299.99
$299.99 · direct from Anker
Last checked 6 days ago. Prices move — check before you buy.
Prices may vary by retailer and are subject to change.