Head-to-head test
EcoFlow RIVER 3 MAX vs Anker SOLIX C300
Nineteen dollars buys 284 more watt-hours and twice the inverter, which settles the matchup outright; the harder question is whether either of these is the size of unit you actually needed.
Full profiles: EcoFlow RIVER 3 MAX → · Anker SOLIX C300 →
Written by Wenny ZhengUpdated
Portable Power Tester, Station Arena Test Desk
.webp)
$499.00 · direct from EcoFlow
Last checked 1 day ago. Prices move — check before you buy.
$329.99 · direct from Anker
Last checked 1 day ago. Prices move — check before you buy.
Spec deltas
Nineteen dollars is the whole price difference here, and it buys 284 more watt-hours, twice the continuous output, and twice the surge. The RIVER 3 MAX is $439 with 572Wh behind a 600W inverter. The SOLIX C300 is $330 with 288Wh behind a 300W one. There is no version of this decision where those two lines don't settle it.
What the C300 gives back is small and real: 1.3 lb, five decibels, and a 140W USB-C port against the RIVER's 100W. If your load is a laptop and a phone in a backpack and nothing else will ever be plugged in, that's a genuine case for the lighter box. Hold onto it, because it's the last point the C300 wins on this page.
The bigger question is whether either belongs in your cart. We bench six loads and five of them beat both units, not narrowly. The weekend-camping list is 2,100Wh and the van-life day is 4,685Wh, against 486Wh usable in the larger of these two. Only the CPAP night comes in under the wire, and only for the RIVER.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
continuous output
Because the cycle ratings are identical at 3,000, the capacity gap compounds instead of washing out: 1,716 kWh of rated lifetime energy from the RIVER against 864 kWh, or nineteen cents a lifetime kilowatt-hour against thirty-five. You are not paying a premium for the bigger unit. You are paying a rounding error and receiving twice the machine.
RIVER 3 MAX: $439, 572Wh, 600W continuous, 1,200W surgeSOLIX C300: $330, 288Wh, 300W continuous, 600W surgeBoth rated 3,000 cycles and 5 years; $0.56/Wh against $1.04/Wh
Why it mattersAnyone who narrowed to these two on price should stop weighing price, because at nineteen dollars there is nothing left to weigh.
The C300 is the quieter of the two by five decibels, which is exactly the spec you'd think mattered most eighteen inches from a sleeping head. It doesn't rescue anything. A quieter box that stops before morning is worse in the only way a CPAP buyer measures, and the RIVER's 166Wh of headroom is what lets it absorb a humidifier or a cold night without you doing arithmetic at bedtime.
CPAP Overnight needs 320Wh; the bench derates every unit by a flat 15% before countingUsable on that basis: 486Wh for the RIVER 3 MAX, 245Wh for the SOLIX C300The RIVER finishes with 166Wh spare; the C300 stops 75Wh shortNoise ratings: 25 dBA for the C300, 30 dBA for the RIVER
Why it mattersIf a CPAP is why you're shopping, the choice between these two is already made, and it isn't the quiet one.
Eight hundred and fifty-eight watt-hours doesn't reach a 910Wh workday, let alone a 1,645Wh outage. Expansion buys the RIVER a larger version of the same job rather than admission to a different one, so it belongs in the nice-to-have column and not in the reason-to-buy column. The reason to buy the RIVER is what it does the day it arrives.
Five of six bench scenarios: neither unit covers the loadThe closest failure is the 670Wh tailgate, where the RIVER 3 MAX is 184Wh shortThe next-closest is the 910Wh remote workday, where it is 424Wh shortThe RIVER 3 line is described as reaching up to 858WhA1 against the 572Wh this unit ships with
Why it mattersIf you're choosing the RIVER because you expect your needs to grow, buy the bigger class of station now instead; if you're choosing it because it's 572Wh for nineteen dollars more, you're choosing it for the right reason.
The specific dimensions that decide these two units — everything else is a tie.
Your Life, Your Pick
Selected because: Five of the six loads we bench beat both units; the only one either covers is the 320Wh CPAP night, and only the RIVER 3 MAX covers it.
Both of these are device chargers wearing the shape of a power station. After the flat 15% derate our scenario math applies to every unit, the RIVER 3 MAX has 486Wh to spend and the C300 has 245Wh, and the smallest load on the board that isn't the CPAP night is a 670Wh tailgate. The RIVER misses that one by 184Wh. The C300 misses it by 425Wh and stops earlier than that anyway, because the scenario asks for a 400W peak and its inverter is rated 300W continuous, with the 600W figure covering a momentary spike rather than a sustained draw.
The CPAP night is the exception and it's the whole pattern in miniature: 320Wh of load, which the RIVER finishes with 166Wh in hand and the C300 misses by 75Wh. When a job is small enough for this class at all, the RIVER covers it and the C300 comes up just short. When it isn't, the two of them fail together and the interesting number stops being which one wins and starts being how far away the finish line is.
Lifetime Value
Selected because: The capacities differ by 284Wh on identical 3,000-cycle ratings, which is where the $0.56 against $1.04 per watt-hour split comes from.
cost / lifetime kWh
Fifty-six cents a watt-hour against a dollar four. That's the cheapest way to see what the price gap is actually doing, and because both units carry the same 3,000-cycle rating and the same five-year warranty, nothing later in their lives claws it back: 1,716 kWh of rated lifetime energy from the RIVER against 864 kWh from the C300.
The honest catch is that cost-per-watt-hour flatters the bigger box automatically and never asks whether you'll use the watt-hours. If your real draw is a phone and a laptop on a weekend, you will never touch the RIVER's extra 284Wh and the C300's higher per-watt-hour number stays trapped in a spreadsheet. Buy the RIVER anyway, and not because the per-watt-hour math says so. Buy it because capacity you don't use costs you nothing to own, and capacity you needed and didn't buy costs you the evening.
Portability & Form Factor
Selected because: The SOLIX C300's best argument is that it's 1.3 lb lighter at 9.1 lb, and this is where that argument gets tested.
weight
A pound and a third is the entire portability argument, and it's between two units you pick up with one hand: 10.4 lb against 9.1 lb. Neither one changes what you're willing to walk with or where you're willing to stash it. If that 1.3 lb is genuinely deciding your purchase, the honest read is that you want a large power bank rather than either of these.
The port sheet is where the C300 lands a real hit. Its USB-C runs to 140W against the RIVER's 100W, and it fields two ports at that ratingB1. For someone whose station exists to keep a laptop alive on a desk and never touches the AC outlet, that's a functional edge with a number behind it. It's also the single spec on this page where the smaller unit is simply better, which is worth knowing before you talk yourself into believing there are others.
What the Specs Don't Tell You
Selected because: Two cards matter here: how slowly the RIVER 3 MAX refills from solar, and what the C300's sealed 288Wh means if you outgrow it.
Read the solar card against the marketing. The RIVER 3 MAX accepts 110W, so filling 572Wh takes a bit over five hours of sun that is actually delivering 110W, and panels hit their rating for a slice of the day rather than the day. The C300's 100W ceiling against 288Wh is under three hours, which quietly makes the smaller unit the better solar companion on a multi-day hike. That's a genuine point for the C300 and it's the one place its small capacity works in its favour.
The expansion card cuts less deep than it looks. The RIVER takes an expansion battery and the C300 is sealed at 288Wh, which sounds decisive until you notice the loads both units fail here start at 670Wh and run to 4,685Wh. Even the line's reported 858Wh ceilingA1 lands under the 910Wh workday. Size the C300 as the permanent 288Wh purchase it is, and buy the RIVER for the 572Wh it already has rather than for the slot on its side.
Strengths & trade-offs
EcoFlow RIVER 3 MAX
Strengths
- +Larger battery capacity
- +Higher AC output
- +Faster solar charging
Trade-offs
- –Substantially more expensive (+$109) than the SOLIX C300.
Anker SOLIX C300
Strengths
- +Costs $109 less
- +Lighter by 1.3 lb
Trade-offs
- –Sealed capacity — the RIVER 3 MAX can add batteries to grow past 288Wh; this one can't.
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 2,100Wh is more than four times the RIVER 3 MAX's 486Wh usable and more than eight times the C300's 245Wh. The RIVER finishes 1,614Wh short and the C300 1,855Wh short. Neither is in range, and no port, app or feature narrows a gap that size. Pack one of these for the phones and bring a bigger station 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
Eight hours off-grid asks for 1,645Wh. The RIVER 3 MAX is 1,159Wh short of it and the C300 is 1,400Wh short, so this isn't a close call between them, it's a size class neither one is in. Both will keep phones and a laptop alive through the evening. Neither keeps the list this scenario is made of running.
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
RIVER 3 MAX
The RIVER 3 MAX takes this one, and it's the only scenario on the board either unit wins. The night needs 320Wh: the RIVER has 486Wh usable and ends with 166Wh spare, while the C300's 245Wh stops 75Wh short of morning. The C300 is the quieter box at 25 dBA against 30, and it makes no difference here, because quiet stops counting the moment the machine does.
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
A full workday's 910Wh outruns both, though not by the same distance. The RIVER 3 MAX gets through about 53% of it and the C300 about 27%, which is the difference between reaching for a wall outlet after lunch and reaching for one before it. Treat either as a way to work untethered for part of a day, not all of it.
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
The tailgate's 670Wh leaves the RIVER 3 MAX 184Wh short, the closest either unit comes to a load it can't have. The C300 is 425Wh short and fails a second way first: the scenario asks for a 400W peak, its inverter is rated 300W continuous, and the 600W figure is surge headroom for a momentary spike rather than a sustained draw. Neither takes this one, but only one of them loses twice.
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
4,685Wh a day is a different product category, not a harder version of this one. The RIVER 3 MAX covers 486Wh of it and the C300 covers 245Wh, leaving shortfalls of 4,199Wh and 4,440Wh. If this is your day, you're shopping for a van electrical system rather than a station you carry, and nothing on this page is the answer.
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 MAX finishes at 21% used, the SOLIX C300 at 41%. At this size the decider is what rides in the bag — 9.1 lbs for the SOLIX C300 against 10.4 for the RIVER 3 MAX — 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: RIVER 3 MAX runs 2.4h vs 1.2h.
$439 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 0–32.4hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–6.5hHigh-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 RIVER 3 MAX, on Power Score margin
Take the RIVER 3 MAX. It's $439 against the SOLIX C300's $330, and for that difference it holds 572Wh instead of 288Wh, runs 600W continuous instead of 300W, and surges to 1,200W instead of 600W. It's also the cheaper energy to own, at $0.56 a watt-hour against $1.04, off identical 3,000-cycle ratings and identical five-year warranties. The C300 hands back 1.3 lb, five decibels, and a faster 140W USB-C portB1, and if your entire load is a laptop and a phone in a bag, that's a coherent argument for the smaller box. It's the only one. Everywhere else the extra 284Wh decides it, including the single bench scenario either unit passes.
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.
$499.00 · direct from EcoFlow
Last checked 1 day ago. Prices move — check before you buy.
or check the SOLIX C300 price$329.99 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
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 MAX rates 4.3/5 (58th percentile of 20 Compact-class units), and SOLIX C300 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.
RIVER 3 MAX: Solar Is a Top-Up, Not a Refill
The RIVER 3 MAX accepts 110W of solar input, so filling its 572Wh takes a bit over five hours of sun that's genuinely delivering 110W, and a panel hits its rating for a slice of the day rather than the day. Plan on solar holding it topped up between wall charges rather than being how you refill it. The C300 is the better-matched pair almost by accident: 288Wh behind a 100W ceiling is under three hours, so one good panel day can reset it completely.
SOLIX C300: Sealed at 288Wh
The C300 is fixed at 288Wh while the RIVER 3 MAX accepts an expansion battery. That reads like the deciding difference and isn't. The loads both units fail on this page start at 670Wh and run to 4,685Wh, and bolting a battery onto a 572Wh station doesn't reach the far end of that range. Buy the C300 as a permanent 288Wh purchase and size it up front. Buy the RIVER for the 572Wh it already has, not for the slot.
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 SOLIX C300 works out at 15.2 years of cover per $1,000 spent against the RIVER 3 MAX's 11.4, but that spread is the price gap, not the terms.
Full record above — the Test Desk pick is the RIVER 3 MAX.
Check RIVER 3 MAX price →or check the SOLIX C300 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 SOLIX C300 is cheaper to buy, but the RIVER 3 MAX is cheaper to own. At $0.26/kWh over its lifetime vs $0.38/kWh, the RIVER 3 MAX'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.
Delivers each lifetime kWh for $0.12 less — check the RIVER 3 MAX 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 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
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 MAX
EXPANDABLESupports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 572Wh.
Accepts up to 110W of solar. Limited to a single portable panel.
Adequate ports for most setups, but heavy users may want a power strip.
Expansion batteries are EcoFlow-specific. You're investing in the EcoFlow ecosystem.
SOLIX C300
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
The SOLIX C300 is sealed at 288Wh, which is fine if that covers you. The RIVER 3 MAX starts at 572Wh and can grow beyond it with EcoFlow expansion batteries — though at this size expansion means longer runtimes on the same loads, not a path to home backup. More hours, not more house.
What Owners Report
Patterns from published owner reports and long-term reviews — every claim cited to its source below.
EcoFlow RIVER 3 MAX
There is no owner record here worth the name. What the file holds for the RIVER 3 MAX is platform-level reviewing: praise for the RIVER 3 chassis as quiet and IP54-ratedA2, the 3,000-cycle LFP rating read back off the spec sheetA3, and a general nod to the line's engineering and portability for people who aren't trying to power a houseA4. Every one of those describes the RIVER 3 family rather than this model at this capacity, and none of them tells you how one behaves in year three.
Two details are worth flagging rather than repeating. One entry puts the line at up to 858WhA1, which is not the 572Wh this unit ships with, so read 858Wh as the line's ceiling and not as what arrives in the box. And the sub-30dB framing in the same fileA2 sits a hair below the 30 dBA on our spec sheet, which is close enough to be a rounding argument and not close enough to quote as fact.
“Offers up to 858Wh of LFP battery storage — the largest capacity in the RIVER 3 line — as a compact, portable unit.”
Sources
powerstationadvisor.com · ecoflow.com · backuppowerhub.com · amazon.com · portablepowernerd.com
Anker SOLIX C300
Same absence on the Anker side. The C300's file is largely its own spec sheet read aloud: 288Wh, 300W output, 600W with SurgePad, two 140W USB-C portsB1, plus Anker's own claim to be 30% smaller than competing stations alongside impressions of it as light and compact for hikesB2, and a positioning line about buyers who want reliability and compact designB4. That is marketing and first impressions, not field experience.
The one judgement in there is worth arguing with. The file calls the C300's 10ms UPS switchover unique in its size and price classB3, and the unit on the other side of this page contradicts it: the RIVER 3 MAX lists the same 10ms at a near-identical price. Treat 10ms as a wash between these two rather than a reason to pick either.
“288Wh capacity with 300W output (600W with SurgePad) and dual 140W USB-C ports for fast device charging.”
Sources
ankersolix.com · trustedreviews.com · im.com.au · solarwaypoint.com · backuppowerhub.com · powerstationlab.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
- Largest RIVER 3 capacity (up to 858Wh), quiet IP54 build, and 3,000-cycle LFP are the standout points. [RIVER 3 MAX · 3 entries]
- Compact, light design; dual 140W USB-C fast charging; and a standout 10ms UPS rare at this size are the highlights. [SOLIX C300 · 3 entries]
- A1
“Offers up to 858Wh of LFP battery storage — the largest capacity in the RIVER 3 line — as a compact, portable unit.”
powerstationadvisor.com / ecoflow.com — RIVER 3 line review · 2026 · [positive]
- A2
“Built on the same RIVER 3 platform reviewers praise for sub-30dB whisper-quiet operation and IP54 ruggedness.”
backuppowerhub.com — RIVER 3 review · 2026 · [positive]
- A3
“LiFePO4 chemistry rated for 3,000+ cycles to 80% — roughly a decade of everyday use.”
backuppowerhub.com / amazon.com — RIVER 3 line · 2026 · [positive]
- A4
“Reviewers value the RIVER 3 family for quality engineering and genuine portability for those who don't need to power a whole house.”
portablepowernerd.com — RIVER 3 review · 2026 · [positive]
- B1
“288Wh capacity with 300W output (600W with SurgePad) and dual 140W USB-C ports for fast device charging.”
ankersolix.com / trustedreviews.com — SOLIX C300 review · 2026 · [positive]
- B2
“Anker claims the C300 is 30% smaller than competing power stations; reviewers call it impressively light and compact for the capacity, aimed at keeping phones and gadgets charged on hikes and camping trips.”
im.com.au / solarwaypoint.com — SOLIX C300 review · 2026 · [positive]
- B3
“Its 10ms UPS switchover is legitimately unique in this size and price class.”
backuppowerhub.com / powerstationlab.com — SOLIX C300 review · 2026 · [positive]
- B4
“Targets users who value reliability, smart features, and compact design.”
backuppowerhub.com — SOLIX C300 review · 2026 · [positive]
Research compiled August 9, 2026.
Who Should Buy Which
Buy the RIVER 3 MAX if you…
- →You run a CPAP away from a wall outlet. It's the only unit on this page that finishes the 320Wh night, and it does it with 166Wh still in the tank for a humidifier or a cold room.
- →You want one box that covers car camping, a laptop, and a phone, and you'd rather carry headroom you never use than discover a shortfall at 2 a.m.
- →You need to run something in the 400W range. A 600W continuous rating takes that in stride; a 300W one doesn't accept it at all, no matter what the surge number says.
Buy the SOLIX C300 if you…
- →Your load is a laptop and a phone, full stop, and you want the fastest charging on the page: 140W USB-C, two portsB1.
- →You're counting ounces into a pack. 9.1 lb against 10.4 lb is the whole case, and it's a real case only if you're carrying it a long way.
- →You'll recharge from a panel every day rather than from a wall. 288Wh behind a 100W ceiling resets in under three hours; the RIVER's 572Wh behind 110W takes over five, so on a multi-day hike the small one is the one that keeps up with the sun.
If neither fits
Anyone whose list includes a refrigerator, a space heater, or a night without grid power should close this tab. The eight-hour outage we bench is 1,645Wh and the van-life day is 4,685Wh, against 486Wh usable in the larger of these two. Run those through the same flat 15% derate and the outage wants roughly a 1,900Wh station on the label while the van wants better than 5,500Wh. Buying either of these for that job doesn't get you partway there. It gets you a very good device charger and a false sense of coverage, which is the worse of the two outcomes.
The Bottom Line
Take the RIVER 3 MAX. Nineteen dollars buys nearly double the energy and double the inverter, and the only things it costs you are a pound and a third and a slower USB-C port. Neither of those shows up in a single scenario. The missing 284Wh shows up in all of them, including the one night either unit was ever going to cover.
If the scenario board made your stomach drop, that's the page doing its job. Both of these are for phones, laptops, a CPAP, a string of lights on a tailgate. If your list has a fridge or a blackout on it, buy the RIVER for the trips and buy something several sizes up for the house, and don't let a nineteen-dollar saving talk you into the wrong answer to a much bigger question.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Is the RIVER 3 MAX worth the extra money over the SOLIX C300?
Yes, and it isn't close. The price difference is nineteen dollars and the capacity difference is 284Wh, 572Wh against 288Wh, with 600W of continuous output against 300W on top of that. The only reasons to take the C300 instead are its 1.3 lb weight advantage and its faster 140W USB-C.
Am I looking at the C300 with an AC outlet, or the DC-only one?
Check the listing before you buy, because the C300 name covers more than one configuration, including a DC-only version with no AC inverter at all. Everything on this page is the standard C300 with AC output: 288Wh, 300W continuous, 600W with SurgePad, two 140W USB-C ports. If the listing doesn't spell out AC output, it isn't the unit compared here, and a DC-only box can't run anything with a wall plug.
Will either of these get me through a power outage?
No. The eight-hour outage we bench needs 1,645Wh, and the larger of these two has 486Wh usable after the flat 15% derate our scenario math applies to every unit. That's under a third of the job. If backup power is why you're shopping, look at stations several times this size and treat both of these as the thing you take camping instead.
Which one should I get for a CPAP?
The RIVER 3 MAX, and it's the only one of the two that works. The night we model needs 320Wh; the RIVER covers it with 166Wh to spare while the C300's 245Wh usable stops 75Wh short. The C300 is quieter on paper at 25 dBA against 30, but a quieter machine that quits before morning is not the trade you want.
Does the RIVER 3 MAX's expansion battery make it future-proof?
Not in any way that changes your decision. The RIVER 3 line is described as topping out around 858Wh, and the nearest load either unit fails on this page is a 910Wh workday. Expansion gives you a bigger version of the same class of job, so buy the RIVER for the 572Wh it ships with; if you genuinely expect to outgrow that, buy a larger station now rather than an add-on later.
Where to buy
EcoFlow RIVER 3 MAXPick
$499.00
$499.00 · direct from EcoFlow
Last checked 1 day ago. Prices move — check before you buy.
Anker SOLIX C300
$329.99
$329.99 · direct from Anker
Last checked 1 day ago. Prices move — check before you buy.
Prices may vary by retailer and are subject to change.