Head-to-head test
EcoFlow RIVER 3 vs Anker SOLIX C300 DC
A dollar apart, both stamped 300W, and only one of them has a wall outlet. That socket is the entire decision.
Full profiles: EcoFlow RIVER 3 → · Anker SOLIX C300 DC →
Written by Wenny ZhengUpdated
Portable Power Tester, Station Arena Test Desk
$239.00 · direct from EcoFlow
Last checked 14 days ago. Prices move — check before you buy.
$199.99 · direct from Anker
Last checked 1 day ago. Prices move — check before you buy.
Spec deltas
The Anker SOLIX C300 DC has no AC outlet. Not a small one, not a weak one. None. That's the sentence this comparison turns on, because at $199 for the RIVER 3 and $200 for the C300 DC, price has already been taken off the table.
Both boxes are stamped 300W, which is where the confusion starts. On the RIVER 3 that's 300W of household AC with 600W of surge behind it. On the C300 DC it's 300W spread across four USB-C ports, two USB-A and a 12V car socketB2. Same number on the label, completely different appliance list.
The Anker answers with the things a device-charging buyer actually feels: 288Wh against 245Wh, 6.17 lbs against 7.8, and a USB-C port that pushes 140W where the RIVER 3 stops at 100W. All real. All improvements to a job the RIVER 3 already does well enough, while EcoFlow's advantage is a job Anker's box can't attempt. That asymmetry is why this goes to the RIVER 3 rather than a coin flip.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
Typical price
The 20ms switchover is what that socket unlocks. Leave the RIVER 3 plugged in behind the TV with the router and modem hanging off it and a flicker never reaches them. The C300 DC can't enter that conversation at any price, because there is nothing for it to switch over to. The honest limit: 300W of inverter with 245Wh behind it makes the RIVER 3 a router-and-lamp UPS, not a desktop-PC one.
RIVER 3: 300W AC output, 600W surge, 20ms UPS switchoverSOLIX C300 DC: 0W surge, no AC inverter, its 300W is USB and 12V$199 against $200
Why it mattersIf you can name one thing in your house with a two-prong cord you'd want running, the RIVER 3 is already the answer and everything below is detail.
Capacity
Capacity is the C300 DC's loudest number and it doesn't win a single scenario with it. Against a 1,645Wh outage, 245Wh and 288Wh give the same answer. So the extra watt-hours aren't buying a capability, they're buying a slightly later moment when the thing shuts off.
SOLIX C300 DC holds 288Wh; RIVER 3 holds 245WhThe smallest load modeled here, CPAP Overnight, needs 320Wh8-Hour Blackout needs 1,645Wh; Weekend Camping needs 2,100Wh
Why it mattersAnyone shopping the capacity column should skip both and go up a size class. Anyone shopping 'what can I plug in' should keep reading.
Pair that with 1.6 lbs less in the bag and the C300 DC stops being the one without the outlet and starts being a deliberately different product: an oversized power bank that happens to take solar. Reviewers land in the same place, framing it as a travel device-charger rather than an appliance boxB4. For the buyer it's aimed at, that's a design decision, not a shortfall.
SOLIX C300 DC: 140W max USB-C, two-way, refills the unit to 80% in about an hourB2RIVER 3: 100W max USB-CSOLIX C300 DC weighs 6.17 lbs to the RIVER 3's 7.8
Why it mattersIf your load list is a phone, a laptop and camera batteries, buy the Anker and don't feel bad about it. You're not giving up anything you were going to use.
The specific dimensions that decide these two units — everything else is a tie.
What the Specs Don't Tell You
Selected because: Three cards, and they are the comparison: a 20ms UPS switchover only one unit can offer, five years of warranty against three, and a noise figure Anker doesn't publish.
Two of these three cards point the same direction and the third is a shrug. The UPS card is the load-bearing one: 20ms is quick enough that a router's power supply never registers the grid left. The C300 DC has no entry there because it has no outlet, and you can't switch over to a socket that isn't in the box.
The warranty card is quieter and it compounds. Both units carry the same 3,000-cycle rating, so the cells are making identical promises, but EcoFlow stands behind that for five years and Anker for three. At the same purchase price that works out to $40 per covered year against $67. The noise card I'd discount: Anker not publishing a decibel figure is a documentation gap, and a box with no inverter has less heat to move than one carrying a 300W inverter.
Portability & Form Factor
Selected because: 6.17 lbs against 7.8 is Anker's strongest counterargument, and it's the one you feel every time the bag goes on your back.
weight
1.6 lbs sounds like nothing until it's the difference between a power station and something you forget is in the pack. At 6.17 lbs the C300 DC rides in a daypack. At 7.8 the RIVER 3 is a thing you decide to bring.
That edge costs Anker nothing, because the weight it saved is the inverter it doesn't haveB1. Which is the honest way to read this section. The C300 DC isn't a lighter RIVER 3, it's a RIVER 3 with a component removed and the savings handed back to you in ounces and watt-hours.
Lifetime Value
Selected because: Both are $199 and $200 with the same 3,000-cycle rating and the same 8.2 years of daily use, so the money question is what the warranty covers, not how long the cells last.
cost / lifetime kWh
Same cells, same clock. Both are rated for 3,000 cycles and both work out to 8.2 years of daily cycling, so longevity separates nothing here. What does move is total throughput: 735 lifetime kWh against 864, purely because Anker's tank is bigger, which lands it at 23 cents per lifetime kilowatt-hour against the RIVER 3's 27.
Four cents. At these prices that's a rounding error dressed up as an argument, and I'd trade it without hesitating for the two extra warranty years. That's worth more than usual with EcoFlow, which offers no parts or service once the warranty lapses. Those five years are the practical service life of the box, not a bonus attached to it.
Your Life, Your Pick
Selected because: All six modeled loads come back 'neither', and knowing which ones miss narrowly and which miss tenfold tells you whether to buy either of these at all.
Six loads, six times 'neither', and the model isn't being harsh. The closest call is CPAP Overnight at 320Wh, where 288Wh doesn't reach the finish any more than 245Wh does. Anker just runs out later. Nothing else is close: 670Wh for a tailgate, 1,645Wh for an eight-hour outage, 4,685Wh for a day of van life.
Read that as a category signal rather than a tiebreak. These are 300W boxes holding a night's worth of phone-and-laptop energy, and this grid is calibrated for units two or three sizes up. Tailgate Party is the one worth pausing on: it's the only load where neither unit can even meet the peak draw, so both fail on wattage before capacity gets a vote.
Strengths & trade-offs
EcoFlow RIVER 3
Strengths
- +Costs $1 less
- +Longer warranty
- +Faster solar charging
Trade-offs
- –No major technical downsides compared to rival.
Anker SOLIX C300 DC
Strengths
- +Lighter by 1.6 lb
- +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
Neither, by a margin that makes the comparison silly. A weekend of camp loads is modeled at 2,100Wh; these two hold 245Wh and 288Wh. Bring one for the phones and the lantern, and bring something much bigger for everything else.
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. An eight-hour outage is modeled at 1,645Wh and neither box is close to it. The RIVER 3 still earns something here that the Anker can't: a 20ms switchover keeps a router and modem from noticing the grid blinked, even though it isn't carrying the night.
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
The closest miss on the board, and still neither. A night is modeled at 320Wh, and while the Anker's 288Wh gets nearer than the RIVER 3's 245Wh, neither finishes. Worth remembering that a CPAP plugs into a wall socket, which is a thing only the RIVER 3 has.
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, though this is the load the C300 DC was shaped for. A remote workday is modeled at 910Wh, past both units. The Anker's 140W USB-C does feed a large laptop at full speed where the RIVER 3's 100W throttles it, so if this is your scenario you're buying a top-up rather than a workday, and Anker tops up faster.
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 this one fails differently. It's the only load on the page where neither unit can meet the peak draw, so they trip on wattage before capacity gets a vote. 670Wh was out of reach anyway. A tailgate wants an inverter with real headroom, and that's a different shelf.
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, by more than an order of magnitude. Van life is modeled at 4,685Wh a day and these hold a rounding error against that. If you're actually living in the vehicle, neither is a candidate. They're the thing you keep in the door pocket for phones.
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 C300 DC at 41%. At this size the decider is what rides in the bag — 6.2 lbs for the SOLIX C300 DC against 7.8 for the RIVER 3 — 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
Only the RIVER 3 can run this load — the SOLIX C300 DC has no AC outlets for the wall-plug gear in it.
$199 list · direct from EcoFlow
Modeled from the spec record — same math as the tables below. Methodology
Runtime by appliance
Real-world runtime estimates for common appliances, modeled at 85% inverter efficiency.¹
Essentials
The basics you need runningscale 0–16.3hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–2.8hHigh-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
August 9, 2026
Verdict: the EcoFlow RIVER 3
Take the RIVER 3 unless you can promise yourself you'll never plug in anything with a two-prong cord. At $199 against $200 the price column has nothing to say, and the two land eleven points apart on PowerScore, 1,632 to 1,621, so the scoring engine can't separate them either. What separates them is the inverter. The RIVER 3 gives you 300W of AC with 600W of surge behind it and a 20ms UPS switchover; the C300 DC gives you none of that, because its 300W is USB and 12V only. Anker's answer is 43Wh more capacity (288Wh against 245Wh), 1.6 lbs less to carry (6.17 lbs against 7.8), and a 140W USB-C port where the RIVER 3 stops at 100W. Those are real improvements to a job the RIVER 3 already does adequately, while the RIVER 3's advantage is a job the C300 DC structurally cannot do. Add five years of warranty against three at the same money and it goes to EcoFlow.
Editor-assigned confidence, based on cited owner research and spec analysis.
List prices as of August 9, 2026. The links below open EcoFlow's and Anker's current prices.
$239.00 · direct from EcoFlow
Last checked 14 days ago. Prices move — check before you buy.
or check the SOLIX C300 DC price$199.99 list
Written by Wenny Zheng, Portable Power Tester · Station Arena Test Desk · Updated August 9, 2026
Measured Data
Benchmark scores and the full spec record, side by side.
Benchmark scores
Not rated for both units (minimum threshold unmet): UPS, CPAP, Tailgating.
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 4.4/5 (67th percentile of 22 Personal-class units), and SOLIX C300 DC rates 4.4/5 (62nd 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.
SOLIX C300 DC: No AC Outlets At All
The SOLIX C300 DC's 300W is a DC port total — USB and 12V — not an inverter rating. Anything with a wall plug (a fridge, a TV, a coffee maker, most fans and lamps) never plugs in, at any wattage. That's the design, not a defect: it buys weight, silence, and efficiency for phone, laptop, camera, and 12V-CPAP loads. The RIVER 3 carries a real inverter behind 2 AC outlets, so it plays in both worlds. Decide which side of that line your gear lives on before weighing anything else on this page.
The RIVER 3 Can Sit Behind Your Router. The C300 DC Can't.
20ms is quicker than a router's power supply can register, so the RIVER 3 works as a genuine desk-side UPS: leave it plugged in and a flicker never reaches the modem. The blank on the Anker side isn't a slower switchover, it's the absence of an AC outlet for one to protect. And the honest limit on our pick: 300W of inverter with 245Wh behind it makes this a router-and-lamp UPS. Don't hang a desktop PC on it.
Five Years Against Three, At the Same Money
Both units carry the same 3,000-cycle rating, so the cells are making identical promises. The difference is how long each brand stands behind them, and spread across the purchase price that's $40 per covered year for the RIVER 3 against $67 for the C300 DC. It counts for more than usual with EcoFlow, which offers no parts or service once the warranty lapses. Those five years are the practical service life.
Anker Doesn't Publish a Decibel Figure, Which Isn't the Same as Being Loud
EcoFlow rates the RIVER 3 at 30 dBA and Anker publishes nothing for the C300 DC, so this column has a hole in it. Read it as a documentation gap rather than a verdict. The C300 DC has no inverter to keep cool, and that's the component that usually spins the fan. We'd rather have the number. Its absence isn't evidence against the unit.
Full record above — the Test Desk pick is the RIVER 3.
Check RIVER 3 price →or check the SOLIX C300 DC 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 is cheaper to buy, but the SOLIX C300 DC is cheaper to own. At $0.23/kWh over its lifetime vs $0.27/kWh, the SOLIX C300 DC's higher cycle life and capacity make each dollar go further over the years. 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 phone, email and chat, with polarized outcomes: prepaid-label replacements handled without argument at one end, long waits and refurbished units against new-unit claims at the other. Buying through Costco or Amazon gives you a second return path if the first one stalls.
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
EcoFlow offers no parts or service out of warranty, which is what makes the five-year term on this unit worth more than a line on a spec sheet. There's also an October 2025 recall on the DELTA Max 2000 for overheating, six incidents, on an entirely different product line. Worth knowing, not worth holding against the RIVER 3.
Anker
Ecosystem
7-8 SOLIX portable power stations across C-series (compact) and F-series (flagship), plus the X1 home energy system
Support
Anker built its name on no-hassle replacements and the parent brand still carries that goodwill, but SOLIX support has been trending down from a genuinely high starting point: AI-driven agents returning generic answers, and awkward return logistics on the heavier units.
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
Firmware updates have removed features from SOLIX gear without warning, and the expansion ecosystem is smaller than EcoFlow's. Neither of these units expands anyway, so the second point costs you nothing here.
Analyst note
EcoFlow sells the deeper catalog, twelve to fifteen models plus the panels and accessories to hang off them, while Anker sells parent-brand trust from a consumer-electronics business most buyers already own something from. At $199 that distinction mostly evaporates. You're not building an ecosystem at this size, you're buying one object. What survives is warranty length and who answers the phone, and on the first of those EcoFlow is two years ahead.
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 C300 DC
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 C300 DC 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
Field data on the RIVER 3 is thin and comparative. Most of what exists measures it against the RIVER 2 rather than reporting a year of ownershipA1A2A4. What it does say is consistent: sub-30 dB operation that EcoFlow and reviewers alike describe as quieter than a libraryA1, plus IP54 sealing, a faster UPS switchover and a 2x runtime mode over the older unitA2. Coverage through 2026 calls it the better buy for camping, van life and home UPS backup specifically where durability and noise matterA3.
Treat that as directional. It's review-desk comparison rather than owners three winters in, and the RIVER 2 framing flatters it by construction. More capacity, less weight and a lower price than its predecessor makes it a strict upgrade on that platformA4, which tells you EcoFlow iterated well. It doesn't tell you how the unit ages.
“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 C300 DC
The C300 DC's evidence is unusually consistent about what the thing is for. Owners praise the portability and say the capacity covers several phone and laptop refills, a fan for hours, or a small light setupB3. The port loadout backs that up: two USB-A, four USB-C and a 12V car socket, with two-way USB-C on PD 3.1 refilling the unit to 80% in about an hourB2.
The one mixed note is the same note. Reviewers frame it as a travel device-charger with app and solar support, explicitly not a box for AC appliancesB4. Nobody who's used it seems confused about that boundaryB3B4, which is worth more than a rave. You'll know within a day whether you bought the right shape.
“A 288Wh unit that ditches the heavy AC inverter to focus on DC power, keeping it very light at about 6.2 lbs.”
Sources
the-gadgeteer.com · forbes.com · androidpolice.com · batteryessence.com · bestbuy.com · campingsolar.us
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]
- Light DC-only design (no AC inverter), fast USB-C charging, and good port selection for device charging are the highlights. [SOLIX C300 DC · 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]
- B1
“A 288Wh unit that ditches the heavy AC inverter to focus on DC power, keeping it very light at about 6.2 lbs.”
the-gadgeteer.com / forbes.com — SOLIX C300 DC review · 2026 · [positive]
- B2
“Offers 2 USB-A and 4 USB-C ports plus a 12V car socket; two-way USB-C with PD 3.1 recharges the unit to 80% in about 1 hour.”
androidpolice.com / batteryessence.com — SOLIX C300 DC review · 2026 · [positive]
- B3
“Owners praise its portability and capacity — enough to charge a phone and laptop several times, run a fan for hours, or power a small light setup.”
bestbuy.com owner reviews — SOLIX C300 DC / C300X · 2026 · [positive]
- B4
“A DC-focused design with app integration and solar support — best for modern travelers charging devices, not running AC appliances.”
androidpolice.com / campingsolar.us — SOLIX C300 DC review · 2026 · [mixed]
Research compiled August 9, 2026.
What Owners Actually Report
Drawn from 29 comments on independent review channels — not from retailer reviews, which skew to the first week of ownership. Each line is our summary of one commenter's claim, linked to the original. We record what they said, including where it contradicts the spec sheet.
EcoFlow RIVER 3
35 claims from 21 comments · 30 from owners · 9 with figures
- UPS switchover
- 5 · 47% negative
- Price & value
- 6 · 17% negative
- Runtime
- 2 · 0% negative
- Warranty & support
- 6 · 73% negative
- Other
- 2 · 100% negative
What owners complain about
Accepts 80V-170V before switching over, which he calls poor for a home-office UPS.
UPS switchovermeasuredowner34 agreedsource →
Surge protection is only 150J, so he keeps it behind an older UPS's surge-only port.
Othermeasuredowner34 agreedsource →
Screen showed jumbled alphanumeric symbols, and the returned unit came back with Wi-Fi disabled.
Durabilityowner6 agreedsource →
What owners praise
Kept router and switch alive about 4 hours per charge during the 5 day post-Milton outage.
Runtimemeasuredowner38 agreedsource →
Happy sticking with their RIVER 3 units at $169 each.
Price & valuemeasuredowner45 agreedsource →
Works awesome as a UPS for Starlink router, switch and camera through rural spikes and outages.
UPS switchoverowner38 agreedsource →
Anker SOLIX C300 DC
12 claims from 8 comments · 10 from owners · 5 with figures
- Solar input
- 4 · 100% negative
- Runtime
- 2 · 0% negative
- Charging
- 2 · 39% negative
- Other
- 1 · 0% negative
- Size & weight
- 1 · 0% negative
What owners complain about
28V input ceiling blocks a 25.6V LiFePO4 bank, which can reach 29.2V fully charged.
Solar inputmeasuredowner4 agreedsource →
Says the C300 DC has no pass-through charging and just cycles between 98% and 100%.
Charging7 agreedsource →
DC5521 plugs with poor tolerances have heated up at 5A; wishes it used XT60 throughout.
Build qualityownersource →
What owners praise
BiPAP with heated hose and humidifier at 80% used 47% of the 288Wh pack over 5 hours of sleep.
Runtimemeasuredowner5 agreedsource →
Can be charged over USB-C at up to 140W, which he thinks is fantastic.
Chargingmeasuredownersource →
His favorite unit: small, transportable, very efficient on 12V and charges well off solar.
Otherownersource →
Claims are weighted by how specific they are, whether the commenter owns the unit, and how many readers agreed. Comments that mention a product under a rival's review count for more, because the commenter had no reason to be there. This is what buyers report, not our test results — for measurements we ran ourselves, see the methodology.
Who Should Buy Which
Buy the RIVER 3 if you…
- →You can name one thing with a wall plug you'd want running off it: a CPAP brick, a lamp, a laptop's own charger, a box fan. The C300 DC can't take any of them.
- →You want a desk-side or TV-side UPS. 20ms is fast enough that a router and modem never notice a flicker, and the RIVER 3 will sit there plugged in doing nothing until the moment it's needed.
- →You're keeping it a while. Five years of warranty at $40 per covered year against three at $67, on two units with identical 3,000-cycle ratings.
- →You camp in weather. IP54 sealing and sub-30 dB running are the two things reviewers single out about this unitA1A2.
Buy the SOLIX C300 DC if you…
- →Your load list is a phone, a tablet, a laptop and camera batteries, and you're sure of it. 288Wh with a 140W USB-C port is the right tool, and owners describing several device refills per charge are describing exactly that useB3.
- →You own a large laptop whose charger is rated above 100W. The RIVER 3's USB-C stops there; Anker's does 140W.
- →You carry it on your back. 6.17 lbs against 7.8 is a difference you notice on a trail, and it buys the capacity edge rather than costing it.
- →You turn gear around fast. Two-way USB-C on PD 3.1 puts it back at 80% in about an hourB2.
If neither fits
Anyone who arrived with a real overnight number. The smallest load on this page is a CPAP night at 320Wh, and neither 245Wh nor 288Wh reaches it. If you want a fridge running, a CPAP going till morning, or a full workday of monitors, both of these are the wrong size and no amount of choosing carefully between them fixes it. Go up to the next class, where you get a proper inverter and several times the capacity, and come back with a shortlist that can finish the job.
The Bottom Line
Take the RIVER 3. The money is a tie, the PowerScores are close enough to be noise, and both units carry the same 3,000-cycle rating, so the one real difference left is that one of them has a wall outlet and the other doesn't. That difference doesn't shrink with use. It shows up the first time you want to plug in something ordinary, and it shows up again every time the grid blinks and the 20ms switchover keeps your router alive.
Anker earns its exception cleanly and it isn't a small one. If your gear is USB and stays USB, the C300 DC is lighter, holds more, feeds a big laptop faster and refills itself in about an hour. Buy it on purpose, not by accident. If you're not sure which of those two people you are, buy the one that can do both jobs. At a dollar apart, the outlet is free.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Does the Anker SOLIX C300 DC have an AC outlet?
No. It's a DC-only unit, so its 300W of output comes from USB-C, USB-A and a 12V car socket with no inverter and no wall socket anywhere on the case. If you need to plug in an ordinary power cord, the RIVER 3 is the only one of these two that can do it, at 300W continuous with 600W of surge. This is the single most important thing to know before you buy either one.
Which is better for camping, the EcoFlow RIVER 3 or the Anker SOLIX C300 DC?
The RIVER 3, unless your camp kit is nothing but devices. It brings a wall outlet, IP54 sealing and sub-30 dB running at $199, a dollar under the Anker's $200. If you're only charging phones, a laptop and a camera, the C300 DC is the smarter carry at 6.17 lbs against 7.8, with 288Wh to the RIVER 3's 245Wh.
Can either of these run a CPAP all night?
No. An overnight CPAP is modeled at 320Wh here and these hold 245Wh and 288Wh, so both come up short before morning even before you account for the energy you never get back out of a battery. The RIVER 3 at least has the AC outlet a CPAP's power brick needs; the C300 DC has nowhere to plug it in. For a full night, shop the next capacity class up.
Why does the RIVER 3 cost more per watt-hour?
Because you're paying for the inverter. At $.81 per Wh against $.69, the RIVER 3 charges a premium on stored energy and hands back 300W of AC, 600W of surge and a 20ms UPS switchover. That trade only works if you'll use the outlet. If you won't, the Anker's watt-hours are cheaper and there's nothing else to argue about.
Which one charges a laptop faster?
The Anker. Its USB-C delivers up to 140W against the RIVER 3's 100W, which matters if your laptop's own charger is rated above 100W. The same port works in reverse, refilling the C300 DC to 80% in about an hour from a PD 3.1 source.
Where to buy
EcoFlow RIVER 3Pick
$239.00
$239.00 · direct from EcoFlow
Last checked 14 days ago. Prices move — check before you buy.
Anker SOLIX C300 DC
$199.99
$199.99 · direct from Anker
Last checked 1 day ago. Prices move — check before you buy.
Prices may vary by retailer and are subject to change.