Head-to-head test
EcoFlow RIVER 3 vs Anker SOLIX C300 DC
The RIVER 3 fixes the one real complaint about EcoFlow's own RIVER 2 — it's quiet, weatherproofed, and faster to switch over — but against the AC-less C300 DC, the deciding fact is the same one that decides every DC matchup: two outlets against zero.
Written by Wenny ZhengUpdated
Portable Power Tester, Station Arena Test Desk
EcoFlow
RIVER 3
1,632Power Score · Device Hub
$199.00 list · direct from EcoFlow
Anker
SOLIX C300 DC
1,621Power Score · Device Hub
$199.99 list · direct from Anker
Spec deltas
The EcoFlow RIVER 3 is the model EcoFlow built specifically to answer its own RIVER 2: quieter (under 30dB against the RIVER 2's under 50), rated IP54 for weather, and switching over in 20ms instead of 30A1A2. Reviewers call it the better buy for most people in 2026A3. None of that changes the one fact that actually decides this matchup: it has 2 AC outlets, and the SOLIX C300 DC has 0.
The DC still answers back the same way it does against every AC-equipped small unit in this price range: $169.99 against $209.00, a $39 gap, while holding 43Wh more capacity (288Wh against 245Wh), weighing 1.63 lbs less (6.17 against 7.8 lbs), and charging over a 140W USB-C port against the RIVER 3's 100W. The engine's own lifetime math still sides with the DC too — 0.20 dollars per kWh against 0.28.
This isn't the RIVER 2 matchup, where the AC-equipped unit had real warts to defend. The RIVER 3 is a genuinely well-built power station. It just still can't out-value a unit that never had to pay for an inverter in the first place.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
Capacity
Whether the opponent is the older RIVER 2 or the refined RIVER 3, the DC's fundamental math doesn't move, because it's a function of what an AC inverter costs to include, not how good the competing unit is.
The RIVER 3 costs $209.00 and holds 245WhThe C300 DC costs $169.99 and holds 288Wh
Why it mattersBuyers filtering purely on price-per-watt-hour should expect the DC to beat any AC-equipped small EcoFlow unit on that metric alone, RIVER 3 included.
Comparing the RIVER 3's polish to the DC's lack of AC isn't the same argument as comparing it to the RIVER 2 — one is a better version of a power station, the other is a different category of device that doesn't compete on switchover speed at all.
The RIVER 3 lists under 30dB and a 20ms UPS switchover, both improvements over the RIVER 2's under 50dB and 30ms switchoverA2The C300 DC has no UPS switchover spec and no AC outlets at all
Why it mattersBuyers should judge the RIVER 3 against the DC purely on whether AC access is needed, not credit its refinement as closing a gap that was never about polish.
The DC's lower sticker price doesn't translate into better warranty economics; the RIVER 3 is simultaneously the pricier unit and the better per-year warranty deal.
The RIVER 3's cost per warranty-year comes out to $42 against the DC's $57Both units run 3,000-cycle cells, but the RIVER 3 carries a 5-year warranty against the DC's 3
Why it mattersBuyers weighing long-term coverage alongside AC access get a second real reason to lean RIVER 3, not just the outlets.
A quieter, more refined AC unit is still an AC unit, and the engine's lifetime math has no way to price in the outlets it doesn't use.
The engine prices the C300 DC at 0.20 dollars per lifetime kWh against the RIVER 3's 0.28The RIVER 3 delivers 735 lifetime kWh against the DC's 864
Why it mattersAnyone treating cost-per-kWh as the deciding number should default to the DC unless AC access rules it out — the RIVER 3's refinements don't move this particular number.
The specific dimensions that decide these two units — everything else is a tie.
What the Specs Don't Tell You
Selected because: UPS advantage and the DC's undisclosed noise rating are the load-bearing cards for this pair.
The UPS card goes to the RIVER 3 as an outright advantage, not a footnote — a documented 20ms switchover behind two real AC outlets, faster than the RIVER 2's own 30ms. The DC has no inverter to switch over, so its field stays empty rather than slower.
Notably, no noise gotcha fires for this pair at all — the RIVER 3's under-30dB rating is quiet enough that it doesn't trip the warning EcoFlow's louder RIVER 2 does against this same DC. The DC's noise card is still a warning, but for the opposite reason: no rating is published, not a bad one.
Lifetime Value
Selected because: The DC wins both price and total lifetime kWh delivered, same as it does against the RIVER 2 — worth showing plainly.
cost / lifetime kWh
The DC wins this cleanly again: 0.20 dollars per lifetime kWh against the RIVER 3's 0.28, built on 864 total lifetime kWh delivered against the RIVER 3's 735. Lower price, more energy, better rate.
The RIVER 3's recovery is the same one the RIVER 2 has: warranty economics. $42 per warranty-year against the DC's $57, on two extra years of coverage. That's a real number in the RIVER 3's favor — it's just a coverage argument, not a cost-of-energy one.
PowerScore Breakdown
Selected because: The composite score still favors the DC despite the RIVER 3 having outlets and UPS — worth explaining what does and doesn't get credited.
overall power score
The engine's composite score still favors the DC, 1,735 against 1,605, and the reason tracks the rest of this page: more capacity, faster USB-C charging, and a better price-per-watt-hour all feed the score, and the DC wins all three outright.
What the score can't credit is the one thing that actually decides this matchup for a lot of buyers — the RIVER 3's two AC outlets and 20ms UPS switchover. A composite number is a fine tiebreaker when the units serve the same job; here, it's measuring a fight the DC was never trying to win.
Brand Trust
Selected because: Cross-brand pair with real, current caveats on both sides worth surfacing.
EcoFlow brings the deeper category ecosystem and faster charging tech across its lineup, along with a genuine recent black eye — the October 2025 DELTA Max 2000 recall over overheating risk is worth knowing even shopping a small unit like the RIVER 3.
Anker's SOLIX line carries the parent brand's broader consumer-electronics trust and, on the Gen 2 lineup specifically, some of the best dollar-per-watt-hour value in the category — but recent reports describe SOLIX support sliding toward generic AI-driven responses. Neither brand's support track record should be the deciding factor here; the AC outlet question already is.
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 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 can fully handle this scenario (needs 2,100Wh). You'd need a higher-capacity station or to cut back on usage.
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 can fully handle this scenario (needs 1,645Wh). You'd need a higher-capacity station or to cut back on usage.
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 unit can fully handle this scenario (needs 320Wh). You'd need a higher-capacity station or to cut back on usage.
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 can fully handle this scenario (needs 910Wh). You'd need a higher-capacity station or to cut back on usage.
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 fully handle this scenario (needs 670Wh). You'd need a higher-capacity station or to cut back on usage.
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 can fully handle this scenario (needs 4,685Wh). You'd need a higher-capacity station or to cut back on usage.
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 six 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 C300 DC runs 1.2h vs 1h.
$199.99 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 15, 2026
Verdict: the EcoFlow RIVER 3
The RIVER 3 is the cleaner unit than its own RIVER 2 sibling in almost every way that matters — under 30dB where the RIVER 2 runs under 50, a 20ms UPS switchover against the RIVER 2's 30ms, and reviewers calling it the better buy for most people in 2026A3. None of that changes the shape of this specific matchup: it has 2 AC outlets and a documented UPS switchover, and the C300 DC has neither. If AC access matters at all, the RIVER 3 is a genuinely good version of the unit you need. If it doesn't, the DC is still $39 cheaper, holds 43Wh more, and wins the engine's own lifetime cost-per-kWh math outright.
Editor-assigned confidence, based on cited owner research and spec analysis.
List prices as of July 15, 2026. The links below open EcoFlow's and Anker's current prices.
$199.00 list · direct from EcoFlow
or check the SOLIX C300 DC price$199.99 list
Written by Wenny Zheng, Portable Power Tester · Station Arena Test Desk · Updated July 15, 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 (62nd percentile of 22 Personal-class units), and SOLIX C300 DC rates 4.2/5 (52nd 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.
20ms and Two Outlets, or Nothing to Switch Over
The RIVER 3's UPS switchover beats even its own RIVER 2 sibling's, at 20ms behind two real AC outlets. The DC has no AC outlets to protect in the first place, so this isn't a speed contest — it's a question of whether there's anything to switch over at all.
5 Years vs 3, and the RIVER 3 Wins the Per-Year Math Too
The RIVER 3's five-year warranty against the DC's three works out to $42 per warranty-year versus $57, despite costing more upfront. Paying more here buys a genuinely better rate, not just more capability.
No Noise Rating on the C300 DC
The DC ships without a published dB figure. It has no AC inverter running under load, so there may simply be less fan noise to disclose — but it's still an absence on the spec sheet next to the RIVER 3's documented, genuinely quiet under-30dB rating.
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.
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. Supports up to 180kWh modular expansion with DELTA Pro Ultra X.
Worth knowing
The Oct 2025 DELTA Max 2000 recall (overheating/fire risk, 6 incidents) is worth noting. Also tested subscription paywalls for advanced app features in early 2025 before community backlash paused the plan. No parts or service offered out of warranty.
Anker
Ecosystem
7-8 SOLIX portable power stations across C-series (compact) and F-series (flagship), plus the X1 home energy system
Support
US-based support. Historically known for incredible no-hassle replacements, but recent reports describe AI-driven support agents giving generic responses and complex return logistics for heavy units (hazmat shipping). The Anker brand reputation is still strong, but SOLIX-specific support quality is trending down.
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
Support quality appears to be declining from its historically excellent level. Firmware updates have removed features without warning. Expansion ecosystem is smaller than EcoFlow's.
Analyst note
EcoFlow positions itself as a mid-to-premium brand with stronger support infrastructure, while Anker competes on value. The question is whether the EcoFlow ecosystem and support premium is worth it for your use case.
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
Coverage of the RIVER 3 is consistently framed as the fix for the RIVER 2's biggest complaint: it runs under 30dB, which EcoFlow itself calls whisper-quiet and reviewers compare to a library, the single most significant upgrade over the louder RIVER 2A1. On top of the quieter operation, it adds IP54 waterproofing, a faster UPS switchover, and a 2x runtime modeA2.
The going recommendation is unqualified where the RIVER 2's was mixed: reviewers call the RIVER 3 the better buy for most people in 2026, for camping, van life, or home UPS backup, on durability and noiseA3. Coverage also frames it as effectively a strict upgrade on the same platformA4 — though the current listed specs actually show it slightly behind the RIVER 2 on capacity (245Wh against 256Wh) and tied on weight at 7.8 lbs, worth knowing if you're comparing against that sibling rather than this one.
“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
Reviewers are most direct about the C300 DC's identity in this pairing: it's a DC-focused design built for modern travelers charging devices, not for running AC appliancesB4 — a sharp contrast to a unit like the RIVER 3, built specifically to be the quiet, weatherproofed appliance-runner in its own lineup.
Owners report that identity holds up day to day — enough capacity to charge a phone and laptop several times over, run a fan for hours, or power a small light setupB3, from a unit that stays light specifically because it skipped the AC inverterB1. The tradeoff shows up as speed elsewhere: two-way USB-C PD 3.1 charges the unit itself to 80% in about an hourB2.
“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 July 15, 2026.
Who Should Buy Which
Buy the RIVER 3 if you…
- →You need AC outlets and want the more refined of EcoFlow's two small units doing it — quieter, weatherproofed, and a faster UPS switchover than the RIVER 2, not just outlets at any cost.
- →You want the better per-year warranty deal alongside AC access: $42 per warranty-year against the DC's $57, on two extra years of coverage.
Buy the SOLIX C300 DC if you…
- →Every device you're charging runs on USB-C, USB-A, or 12V — the DC is $39 cheaper, holds 43Wh more, and its 140W USB-C port outpaces the RIVER 3's 100W.
- →You want the better lifetime-value pick by the engine's own numbers: 0.20 dollars per kWh against the RIVER 3's 0.28, on more total energy delivered over its rated life.
If neither fits
Neither covers a real weekend camping trip (roughly 2,100Wh needed) or an 8-hour multi-appliance blackout (roughly 1,645Wh needed) — both fall well short regardless of which one has outlets. Step up to a 1,000Wh-plus unit from either brand for that job.
The Bottom Line
The RIVER 3 is a real answer to the RIVER 2's flaws — quieter, weatherproofed, faster to switch over — but against the AC-less C300 DC, this comes down to the same gate as every DC matchup: does the job need a wall outlet.
If it does, the RIVER 3 is a genuinely good version of the unit you need, not just the only option. If it doesn't, the DC is still $39 cheaper, holds more capacity, and wins the engine's own lifetime cost-per-kWh math — refinement on the RIVER 3's side doesn't change that arithmetic.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
What's the real difference between the RIVER 3 and the SOLIX C300 DC?
The RIVER 3 has two AC outlets backed by a 20ms UPS switchover; the C300 DC has neither. Past that, the DC is cheaper ($169.99 against $209.00), holds more capacity (288Wh against 245Wh), and charges faster over USB-C (140W against 100W).
Can the SOLIX C300 DC run anything that plugs into a wall?
No. Its spec sheet lists zero AC outlets — it only charges and outputs over USB-A, USB-C, and a 12V car socket. If the job needs a standard wall plug, the RIVER 3 is the one that can do it here.
Is the RIVER 3 actually quiet?
Its spec sheet lists it running under 30dB, and reviewers describe that as whisper-quiet — noticeably better than EcoFlow's own RIVER 2, which runs under 50dB under the same kind of load. It's quiet enough that no noise-related warning fires for this pair at all.
Which one is the better value?
The DC, on every lifetime-value metric the engine tracks: 0.20 dollars per lifetime kWh against the RIVER 3's 0.28, on more total energy delivered for $39 less upfront. The RIVER 3's real recovery is warranty economics — $42 per warranty-year against the DC's $57.
Which one should I use for a CPAP or something I'll sleep near?
If the CPAP plugs into AC, the RIVER 3 is the only option here, and its under-30dB rating makes it a genuinely reasonable pick for that job. If the device charges over USB-C, the DC's lack of an inverter fan and undisclosed rating make it the quieter bet by design, even without a published number.
Where to buy
EcoFlow RIVER 3Pick
$199.00
$199.00 list · direct from EcoFlow
Anker SOLIX C300 DC
$199.99
$199.99 list · direct from Anker
Prices may vary by retailer and are subject to change.