Head-to-head test
EcoFlow RIVER 2 Pro vs Anker SOLIX C300 DC
With no inverter in the SOLIX C300 DC, the only question that decides this is whether every last thing you plug in charges over USB or a 12V socket, because the moment one of them doesn't, the RIVER 2 Pro is the only unit on the page.
Full profiles: EcoFlow RIVER 2 Pro → · Anker SOLIX C300 DC →
Written by Wenny ZhengUpdated
Portable Power Tester, Station Arena Test Desk
$389.00 · direct from EcoFlow
Last checked 1 day 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
Four AC outlets against none. The SOLIX C300 DC's 300W is a total for its USB and 12V ports rather than an inverter rating, so a box fan, a TV, a coffee maker, a lamp with a wall plug: none of them ever run on it, at any wattage, and no capacity argument changes that.
That's a design choice, not a shortfall, and it buys something real. 6.2 lbs against the RIVER 2 Pro's 17.2, a 140W USB-C port that works in both directions, and no inverter in there to cool. In the one scenario built for that kind of day, 100Wh of phones and a speaker across an afternoon, the C300 DC finishes at 41% used and the RIVER 2 Pro's extra capacity is just weight in the bag.
So take the RIVER 2 Pro at $349, because it covers both worlds and, over 3,000 cycles, turns out to be the cheaper energy as well. Buy the $200 C300 DC only if you can name every load in advance and every one of them charges from USB or a car socket. Most packing lists have one wall plug hiding in them.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
The one row where it's genuinely in the running is the 40W load you'd run off a DC cable, and it still stops 75Wh from morning while the RIVER 2 Pro finishes the same night with 333Wh untouched. So the boundary isn't AC against DC alone. Inside the C300 DC's own lane, the line falls at anything that has to last until sunrise.
The SOLIX C300 DC has no AC outlets; its 300W is a DC port total for USB and 12V, not an inverter ratingFive of the seven scenarios end in 'neither', every one of them because wall-plug gear never connects to the C300 DC at allCPAP Overnight is the row where it loses on energy instead: 245Wh usable against the 320Wh the night needs, 75Wh short, about 76% covered
Why it mattersIf one load on your list runs overnight, buy the RIVER 2 Pro; the C300 DC is a daytime charger that happens to be excellent at it.
cost / lifetime kWh
Fifteen cents a kilowatt-hour against twenty-three. The cheaper box is the more expensive electricity, and the saving is one-time while the penalty runs all 3,000 cycles. The warranty lands on the same side: 5 years against 3, so a fault in year four is covered on exactly one of them.
$349 for the RIVER 2 Pro against $200 for the SOLIX C300 DC, a gap of $149Both packs are rated for a minimum of 3,000 cycles768Wh times 3,000 cycles is 2,304 kWh over the pack's life; 288Wh times 3,000 is 864 kWh$0.15 per lifetime kWh against $0.23Warranty runs 5 years against 3
Why it mattersIf you're buying this to keep for years rather than for one trip, stop treating $200 as the cheaper option.
solar input
The light one also refills from the laptop brick already in your bag rather than a charger of its ownB2, so the eleven pounds you leave behind (17.2 minus 6.2) don't come back as an accessory. What the RIVER 2 Pro keeps for itself is panel speed, 220W against 100W, and that only matters when your refill comes from the sun instead of a socket.
6.2 lbs for the SOLIX C300 DC against 17.2 lbs for the RIVER 2 ProThe C300 DC's USB-C runs to 140W and works in both directions; reviewers clock it back to 80% in about an hour off PD 3.1B2Afternoon Off-Grid needs 100Wh across the afternoon at a 30W peak, and both cover it: the C300 DC at 41% used, the RIVER 2 Pro at 15%Solar input is 220W on the RIVER 2 Pro against 100W on the C300 DC
Why it mattersPhotographers, one-bag travelers, and anyone whose whole load list is USB should take the C300 DC and not be talked out of it.
continuous output
The published number describes fast charging, which is the one thing on this page you can schedule. Refill in the afternoon and the unit spends the night at a draw nowhere near the regime that figure is about. The C300 DC's quiet, meanwhile, is undocumented rather than measured, because there's no figure to hold it to at all.
EcoFlow's own figure puts the RIVER 2 Pro at up to 62dB when charging and discharging at high wattageA2The CPAP Overnight load peaks at 40W against the RIVER 2 Pro's 800W continuous ratingAnker publishes no noise figure for the SOLIX C300 DCOne owner fitted quieter fans, which meant cutting away some internal plasticA1
Why it mattersBedside and CPAP buyers shouldn't let 62dB push them to the smaller unit; it's the spec that looks worst on paper and bites least in the room.
The specific dimensions that decide these two units — everything else is a tie.
What the Specs Don't Tell You
Selected because: The card that decides this page sits here: the SOLIX C300 DC has no AC outlets at all, so anything with a wall plug is out before capacity is discussed.
A wall plug is a physical fact, and no watt-hour total argues with it. The 300W printed on the SOLIX C300 DC is the sum of what its USB and 12V ports can push, so the question was never whether it's strong enough for your fridge. Your fridge has nowhere to go.
The rest of the cards sort themselves around one buyer: the person shopping for a bedside or a blackout. The RIVER 2 Pro is the only one here with a UPS mode, and its transfer figure is a ceiling of 30ms rather than a stopwatch result, long enough that a fussy desktop may reboot anyway. It's also the only one with a published noise level, which makes it look like the louder unit when it's only the documented one. For a router, a modem or a CPAP, that's a trade worth making.
Your Life, Your Pick
Selected because: Five of the seven loads end in 'neither', and seeing which rows fail on ports and which fail on watt-hours is the fastest way to place your own night.
The failures aren't the same kind of failure. All five 'neither' rows are the C300 DC standing outside the scenario while the RIVER 2 Pro comes up short inside it: 992Wh short of the 1,645Wh an eight-hour blackout wants, 1,447Wh short of a weekend's 2,100Wh, 257Wh short of a 910Wh workday. Those are honest misses from a 768Wh unit, and they tell you it's a devices-and-essentials box rather than a house.
Two rows deserve your attention. The CPAP night is the only one with a single winner, and the afternoon row is the only one the C300 DC was designed for, which is also the only place 17.2 lbs is the wrong answer. Everything between those two is really a question about whether you should be shopping in this size class at all.
Portability & Form Factor
Selected because: 6.2 lbs against 17.2 is the one axis the smaller unit wins outright, and for a day of device charging it wins convincingly.
weight
17.2 lbs against 6.2 is the difference between a unit you sling into a daypack and one you carry by the handle to the car. Neither is a two-person lift, so this isn't a basement-stairs story; it's whether you still notice it at hour three of a hike. The C300 DC you forget about. The RIVER 2 Pro you put down.
That's the honest case for the smaller unit and it's a strong one for a specific day: phones, a laptop, camera batteries, a speaker. The trap is buying 6.2 lbs for a trip where somebody brings a coffee maker.
Lifetime Value
Selected because: Both packs are rated for 3,000 cycles, so $349 buys 2,304 kWh of lifetime energy where $200 buys 864: the cheaper unit is the dearer electricity.
cost / lifetime kWh
Two packs rated for the same 3,000 cycles, and one of them delivers well over twice the energy before it gets there. The price gap isn't a premium, it's a bulk discount on kilowatt-hours you'll actually use.
In practice this is decided by how long you keep it. For one season, $149 is just $149 and the C300 DC is the better-value object. Keep it and cycle it and the per-kilowatt-hour gap is the number you're really paying, with coverage landing the same way: the RIVER 2 Pro is still under warranty in year four and the C300 DC isn't.
Strengths & trade-offs
EcoFlow RIVER 2 Pro
Strengths
- +Larger battery capacity
- +Higher AC output
- +Longer warranty
- +Faster solar charging
Trade-offs
- –Substantially more expensive (+$149) than the SOLIX C300 DC.
- –Significantly heavier (+11 lbs), making it harder to move.
- –Can receive complaints about fan noise under heavy load.
Anker SOLIX C300 DC
Strengths
- +Costs $149 less
- +Lighter by 11 lb
Trade-offs
- –No major technical downsides compared to rival.
Will It Power Your Gear?
Scenario math and per-appliance runtimes, modeled from the spec record.
Scenario verdicts
We ran the math on 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
The SOLIX C300 DC has no AC outlets, so the led lights and box fan in this scenario never plug in — it's a DC station for USB and 12V gear, and no wattage figure changes that, so capacity never gets a say. This is the wrong kind of unit for the job rather than a close call. The RIVER 2 Pro doesn't have the energy either — 653Wh usable against 2,100Wh, 1,447Wh short — so neither route works.
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
The SOLIX C300 DC has no AC outlets, so the fridge, router + modem and the rest in this scenario never plug in — it's a DC station for USB and 12V gear, and no wattage figure changes that, so capacity never gets a say. This is the wrong kind of unit for the job rather than a close call. The RIVER 2 Pro doesn't have the energy either — 653Wh usable against 1,645Wh, 992Wh short — so neither route works.
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 2 Pro
The RIVER 2 Pro takes this one, and it isn't close in the way that matters at 3 a.m.: 653Wh usable against the 320Wh the night asks for, so it wakes up with 333Wh still in the tank. The SOLIX C300 DC gets about 76% of the way and stops 75Wh short, which at the 40W this load draws is roughly the last two hours before your alarm. Anything overnight wants the bigger pack.
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
The SOLIX C300 DC has no AC outlets, so the external monitor and router + modem in this scenario never plug in — it's a DC station for USB and 12V gear, and no wattage figure changes that, so capacity never gets a say. This is the wrong kind of unit for the job rather than a close call. The RIVER 2 Pro doesn't have the energy either — 653Wh usable against 910Wh, 257Wh short — so neither route works.
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 finishes this one, for two completely different reasons. The blender and the TV never reach the SOLIX C300 DC at all, because there's nothing to plug them into. The RIVER 2 Pro starts the 400W peak without complaint and then runs out of road 17Wh from the end of a 670Wh afternoon, which is the most annoying way to lose. Bring a second battery or a bigger unit.
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
The SOLIX C300 DC has no AC outlets, so the mini-fridge, led lights and the rest in this scenario never plug in — it's a DC station for USB and 12V gear, and no wattage figure changes that, so capacity never gets a say. This is the wrong kind of unit for the job rather than a close call. The RIVER 2 Pro doesn't have the energy either — 653Wh usable against 4,685Wh, 4,032Wh short — so neither route works.
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 row the SOLIX C300 DC exists for: 100Wh of phones and a speaker across an afternoon, a 30W peak, nothing with a plug on it. Both units walk it, the C300 DC finishing at 41% used with 145Wh in reserve while the RIVER 2 Pro barely registers the load. That isn't a reason to bring the bigger one. For this job its extra capacity is weight you carry and never spend, and the right answer is the 6.2 lb unit.
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 2 Pro can run this load — the SOLIX C300 DC has no AC outlets for the wall-plug gear in it.
$349 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 0–43.5hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–8.7hHigh-Draw Appliances
These reveal the real limits¹ Runtime = (capacity × 0.85) ÷ appliance watts. Within each group, all bars share one time scale (the group's longest runtime), so lengths are comparable across appliances; identical runtimes collapse into a single blue/orange bar. Actual runtime varies with battery age, temperature, and simultaneous loads — see methodology.
Conclusion
September 13, 2026
Verdict: the RIVER 2 Pro, on Power Score margin
Buy the RIVER 2 Pro. It's the only one of the two with an inverter, so it's the only one that runs anything with a wall plug, and that single fact settles five of the seven scenario rows before capacity gets a word in. It also covers the 320Wh CPAP night with 333Wh spare where the C300 DC stops 75Wh short, it starts the largest peak on this page (a 400W blender) on 800W continuous and 1,600W of surge, and across a shared 3,000-cycle rating it delivers 2,304 kWh of lifetime energy against 864, which makes the dearer box the cheaper kilowatt-hour. The reason this is a 7 and not a 9: the C300 DC wins its own lane outright. If every load you own charges over USB or 12V and weight is what hurts, 6.2 lbs against 17.2 plus a 140W two-way USB-C port is the better buy, and the $149 you keep is real money.
Editor-assigned confidence, based on cited owner research and spec analysis.
List prices as of September 13, 2026. The links below open EcoFlow's and Anker's current prices.
$389.00 · direct from EcoFlow
Last checked 1 day 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 September 13, 2026
Measured Data
Benchmark scores and the full spec record, side by side.
Benchmark scores
Not rated for both units (minimum threshold unmet): CPAP, Solar Generator, 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 2 Pro rates 4.7/5 (84th percentile of 20 Compact-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.
RIVER 2 Pro: 62dB Is the Fast-Charge Ceiling
The 62dB figure is EcoFlow's own number for charging and discharging at high wattage, which makes it a ceiling for the unit working hard rather than something it hums at all day. Against an 800W continuous rating, a 40W CPAP is not that condition. The noise is real, and it's real precisely when you're moving power in or out in a hurry, so treat it as a scheduling problem: refill in the afternoon and let it coast overnight. What you shouldn't do is read 62dB as the sound of this thing sitting beside your bed.
SOLIX C300 DC: No AC Outlets, By Design
Everything else on this page is downstream of this card. The SOLIX C300 DC's 300W is the total across its ports, 4 USB-C and 2 USB-A plus a 12V car socket, not an inverter rating, so a fridge, a TV, a coffee maker or a lamp with a wall plug has nowhere to go on it at any wattage. That's the design working rather than failing: leaving out the inverter is how you get to 6.2 lbs. The RIVER 2 Pro puts a real inverter behind 4 AC outlets and plays in both worlds. Work out which side of that line your gear lives on and most of this comparison answers itself.
Only the RIVER 2 Pro Lists a UPS Mode
The RIVER 2 Pro will sit between the wall and your gear and hand it to battery when the grid drops. Read the transfer spec as what it is: a ceiling of 30ms, not a stopwatch result, and a gap that long is one plenty of desktops won't ride through. For a router, a modem or a CPAP it's the difference between an outage and a non-event. For a workstation, assume the reboot and be glad when it doesn't come. The SOLIX C300 DC lists no UPS mode, so anything on it rides out a cut only as far as your reaction time.
Warranty: 5 Years vs 3
The RIVER 2 Pro is covered for 5 years against the SOLIX C300 DC's 3 years. An underrated factor if you're keeping this unit for years.
SOLIX C300 DC: No Published Noise Figure
Anker doesn't publish a noise level for the C300 DC, which is not the same thing as quiet. There's no inverter in there to cool, so expecting less fan is reasonable; expecting it on the strength of a missing number is not. If you're buying for a bedroom, note that the only figure on the table belongs to the RIVER 2 Pro, and a spec-sheet figure isn't a measurement either. Go looking for hands-on reports before you let silence-by-omission decide this.
Full record above — the Test Desk pick is the RIVER 2 Pro.
Check RIVER 2 Pro 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 SOLIX C300 DC is cheaper to buy, but the RIVER 2 Pro is cheaper to own. At $0.15/kWh over its lifetime vs $0.23/kWh, the RIVER 2 Pro'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 support, and the experiences split hard. Plenty of hassle-free prepaid-label replacements, and plenty of long waits with a refurbished unit turning up against a claim for a new one. Buying through Costco or Amazon gives you a return path that doesn't depend on which version of that you get.
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 tested subscription paywalls for advanced app features in early 2025 and paused the plan after community pushback. There's also no parts or service once the warranty is up, which matters more on a unit covered for 5 years than it first sounds.
Anker
Ecosystem
7-8 SOLIX portable power stations across C-series (compact) and F-series (flagship), plus the X1 home energy system
Support
Anker's no-hassle replacement reputation was earned on chargers and cables, and SOLIX support is drifting away from it: AI-driven agents giving generic answers, and awkward return logistics on the heavier units. The brand equity is real. Just check it still applies to the power-station line before you count on it.
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
Anker's value case sharpens as the units get bigger, and the C1000, S2000 and F2600 are among the better buys per watt-hour in the catalog. The C300 DC's argument is a different one: it's the lightest way to carry 288Wh, because it isn't carrying an inverter.
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 brings the deeper bench, 12 to 15 models plus solar and home panels, and the more active community; Anker brings the household name and, in its larger units, the better price per watt-hour. Neither ecosystem matters much here, though, because neither of these two expands. What you buy is what you own, so buy on the box rather than the badge.
Growth path
RIVER 2 Pro
FIXED CAPACITYFixed at 768Wh, with no expansion — so size it for your needs up front rather than planning to add capacity later.
Accepts up to 220W of solar. Limited to a single portable panel.
Adequate ports for most setups, but heavy users may want a power strip.
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 RIVER 2 Pro gives you the larger ceiling); you can't add to either later.
What Owners Report
Patterns from published owner reports and long-term reviews — every claim cited to its source below.
EcoFlow RIVER 2 Pro
Field reporting on the RIVER 2 Pro specifically is thin. Our research pass could confidently attribute only four items to this exact model rather than to the RIVER 2 line generally, so treat what follows as a sketch rather than a surveyA0. The clearest signal in it is fan noise at high wattage, which EcoFlow documents itself at up to 62dBA2 and which at least one owner found irritating enough to fit quieter fans, cutting away internal plastic to make them go inA1.
Two threads point at what people actually buy this for. One owner asks whether running it as a UPS full-time shortens battery life, which is the right question and one the spec sheet doesn't answerA3. Another, a van dweller a week into CPAP therapy, describes running an AirSense 11 overnight from a ResMed DC-DC cable off a battery bankA4. Worth knowing, because that cable is what makes a DC-only station a CPAP candidate in the first place.
“Will using River 2 Pro as a UPS affect battery life ...”
Sources
ctrl-alt-rees.com
Anker SOLIX C300 DC
What exists for the SOLIX C300 DC comes from reviewers rather than long-term owners, and it's consistent: dropping the AC inverter is how it gets to about 6.2 lbsB1, with 2 USB-A, 4 USB-C and a 12V car socket, and two-way USB-C that refills it to 80% in about an hourB2. Owner reviews line up with that, praising portability and naming what it does comfortably: a few phone and laptop refills, a fan for hours, a small light setupB3.
The one caveat in the file is the line the spec sheet already draws, in reviewers' words: a DC-focused design for travelers charging devices, not for running AC appliancesB4. The owner reports don't read like people who were surprised by thatB3B4, which is about the best thing you can say about a product with a hard limit.
“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
- Fan noise at high wattage charging/discharging is a consistent owner and manufacturer-acknowledged complaint, severe enough that some owners physically mod the unit with quieter fans. [RIVER 2 Pro · 2 entries]
- 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
“I've since performed the same mod on my RIVER 2 PRO and it works great for that unit, too - although it did involve cutting away some of the internal plastic.”
ctrl-alt-rees.com blog — 'EcoFlow RIVER 2 Noisy Fan Fix!' · 2022-11-17 · [negative]
- A2
“When charging and discharging at high wattage, RIVER 2 Max and RIVER 2 Pro may make a noise up to 62db.”
EcoFlow official product page — RIVER 2 Series specs/FAQ footnotes · unknown · [negative]
- A3
“Will using River 2 Pro as a UPS affect battery life ...”
Facebook — EcoFlow Club group post title · unknown · [mixed]
- A4
“I'm very new to CPAP (1 week) and I live in a van. I have solar and a decent battery bank and I've got the ResMed DC-DC cable which powers my AirSense 11 AutoSet overnight no problem.”
Apnea Board forum — '[Equipment] EcoFlow River 2 Pro' thread · 2025-07 · [mixed]
- B1
“A 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 September 13, 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 2 Pro
32 claims from 21 comments · 27 from owners · 8 with figures
- Runtime
- 5 · 0% negative
- Size & weight
- 2 · 0% negative
- Solar input
- 2 · 0% negative
- Inverter & surge
- 3 · 23% negative
- App & firmware
- 3 · 0% negative
What owners complain about
Wildly fluctuating DC output on two separate units bought from different retailers.
Build qualityowner1 agreedsource →
Does tend to self-discharge, so he keeps it on the low 100W power setting.
Idle drainowner3 agreedsource →
Unit would not power on within a week of purchase despite a full charge.
Durabilityownersource →
What owners praise
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 2 Pro if you…
- →You want one box that covers a CPAP night, a router through an outage and a bit of small AC gear: 653Wh usable covers the 320Wh CPAP night with 333Wh to spare, and 800W continuous with 1,600W of surge handles a 400W startup, the biggest peak anywhere on this page.
- →You're refilling from panels rather than a wall socket. 220W of solar input against 100W is the gap that shows up on day two.
- →You expect to still own this in year four and to cycle it often. That's the buyer the 5-year term and the 2,304 kWh of lifetime energy are for.
Buy the SOLIX C300 DC if you…
- →Your whole list charges over USB or a 12V socket: phone, laptop, camera batteries, headlamp, speaker. The afternoon row is your row, and the C300 DC finishes it at 41% used with 145Wh still in hand.
- →Weight is the binding constraint. 6.2 lbs goes in a daypack; 17.2 lbs goes in a car.
- →You want one bag and one charger. A 140W two-way USB-C port means the brick that charges your laptop also refills the station.
If neither fits
If your list has a fridge, a space heater, or a full day of van-life loads on it, close this tab. The eight-hour blackout row wants 1,645Wh and even the RIVER 2 Pro is 992Wh short of it; van life daily wants 4,685Wh against its 768Wh, six times over. What you want is an AC station several times that capacity, bought once, rather than either of these plus a second purchase in six months.
The Bottom Line
Take the RIVER 2 Pro. It's the only one of the two that runs anything with a wall plug, it covers the CPAP night with 333Wh to spare, and over 3,000 cycles it's the cheaper electricity and the longer warranty besides. The $149 you'd save going the other way is the price of a promise that nothing you own has a plug on it.
The C300 DC isn't the loser here so much as a different tool, and a good one: 6.2 lbs, a 140W two-way USB-C port, and an afternoon of phones and a speaker handled at 41% used. If that's honestly your entire list, buy it and enjoy the space in your bag. If you had to think about it for more than a second, buy the RIVER 2 Pro.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Does the Anker SOLIX C300 DC have AC outlets?
No, none at all, and it's the most important thing on this page. Its 300W figure is the total across its USB and 12V ports, so a wall plug has nowhere to go on this unit at any wattage. The RIVER 2 Pro carries a real inverter behind 4 AC outlets, which is why it's the pick unless your gear is strictly USB and 12V.
Can the SOLIX C300 DC run a CPAP all night?
Not a full night. Against the 320Wh our CPAP profile draws it has 245Wh usable, leaving it 75Wh short, about 76% of the way there. It also assumes a DC-DC cable, since there's no AC outlet for a standard CPAP brick. The RIVER 2 Pro covers the same night with 333Wh left over.
Is the EcoFlow RIVER 2 Pro loud?
62dB is EcoFlow's own number for charging and discharging at high wattage, not what the unit does at a trickle, and a 40W CPAP is nowhere near that regime against an 800W continuous rating. The noise is real when you're pushing power in or out fast, and one owner disliked it enough to fit quieter fans. Charge it in the afternoon and it isn't a bedroom problem.
Which one is cheaper to own?
The RIVER 2 Pro, if you actually cycle it. Both packs are rated for a minimum of 3,000 cycles, so $349 buys 2,304 kWh of energy over the pack's life where $200 buys 864. For a single trip none of that applies and the C300 DC is simply the cheaper thing to buy.
Can either one keep my router on through a power cut?
The RIVER 2 Pro can. It lists a UPS mode and hands over to battery when the grid drops, rated at no worse than 30ms, which is fine for a router or a modem and occasionally not fast enough for a desktop. The SOLIX C300 DC lists no UPS mode, so anything on it rides out an outage only as fast as you can get to it.
Where to buy
EcoFlow RIVER 2 ProPick
$389.00
$389.00 · direct from EcoFlow
Last checked 1 day 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.