Head-to-head test
EcoFlow DELTA 2 vs Anker SOLIX C300 DC
The DELTA 2 covers a 400W tailgate peak with 200Wh to spare and the SOLIX C300 DC can't start it, so the only question that decides this is whether your list ends in wall plugs or in USB-C.
Full profiles: EcoFlow DELTA 2 → · Anker SOLIX C300 DC →
Written by Wenny ZhengUpdated
Portable Power Tester, Station Arena Test Desk
$499.00 · direct from EcoFlow
Last checked 58 days ago. Prices move — check before you buy.
$199.99 · direct from Anker
Last checked 1 day ago. Prices move — check before you buy.
Spec deltas
The DELTA 2 holds 1,024Wh and pushes 1,800W. The SOLIX C300 DC holds 288Wh and is rated for 300W. Those aren't two versions of the same product at two prices; that's a power station sitting next to a very good battery for things that charge over USB-C, and once you see it that way the $299 between them stops looking like a discount.
One thing to settle before anything else, because it's the fact the whole comparison turns on. Our spec sheet lists the C300 DC at 300W of output with a surge value of zero, meaning no published figure. The review record describes a unit that deletes the AC inverter altogether to stay near six poundsB1B4. We can't reconcile those two from here and you shouldn't have to, because both readings rule out the same list of hardware: either the 300W is DC-only and there are no AC sockets to plug into, or it's 300W of inverter with no headroom above it. Check the port layout on the listing before you buy if a wall socket is part of your plan.
So the DELTA 2 wins, and the interesting half is who should still take the Anker. If your entire load charges over USB-C, the C300 DC delivers 140W from a port against the DELTA 2's 100W, weighs 6.17 lbs against 27, and costs $200. For that job it's the better object. It just isn't in the running for any job with a plug on the end of it.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
continuous output
The DELTA 2's 2,700W of surge is nine times the C300 DC's entire 300W continuous rating, and surge is the spec that decides whether a compressor or a power tool actually starts rather than merely runs once it's going. There's no overlap between those two numbers worth arguing over. One unit is built to absorb the kick of a motor starting; the other is built to fill a laptop.
DELTA 2: 1,800W continuous output with 2,700W of surgeSOLIX C300 DC: 300W rated output, surge listed as 0 — no published figureTailgate Party: 670Wh total with a 400W peak, and the C300 DC fails it on the peak rather than the total
Why it mattersIf a single item on your list has a motor, a compressor or a heating element in it, stop comparing and buy the DELTA 2.
Capacity
That missing inverter is also why its best port beats the bigger unit's: 140W of USB-C against 100W, on something that weighs nearly 21 pounds less. Reviewers count four USB-C ports, two USB-A and a 12V socket, with two-way USB-C on PD 3.1 refilling the unit to 80% in about an hour, and owners report 288Wh covering several phone and laptop refills or a small light setupB2B3. For a week of devices out of a backpack, the DELTA 2 is 21 extra pounds of AC hardware you never plug into.
SOLIX C300 DC: 288Wh at 6.17 lbsDELTA 2: 1,024Wh at 27 lbsUSB-C output: 140W on the C300 DC against 100W on the DELTA 2
Why it mattersIf your kit ends in USB-C — laptop, phones, camera batteries, a headlamp — take the Anker and keep the $299.
Typical price
The cheaper unit is the more expensive energy, and it stays that way for its whole life, because the ratio is fixed the day you buy it. That only matters if you'd genuinely have used the extra 2,208 kWh. If 288Wh covers your real loads, the better rate is headroom you paid $299 for and never touch.
Both units are rated for 3,000 cyclesDELTA 2: $499 spread over 3,072 lifetime kWh (1,024Wh × 3,000 cycles)SOLIX C300 DC: $200 spread over 864 lifetime kWh (288Wh × 3,000 cycles)
Why it mattersDon't buy the DELTA 2 on cost per kilowatt-hour; buy it because you need the watt-hours, and treat the better rate as the bonus.
The DELTA 2 finishes the night and finishes it in its quiet band. To average 120W, the point where its fans wake upA1, you'd have to empty those 320Wh in under three hours, which is not what a night on a CPAP looks like. The catch sits at the other end of the day: charge it fast in the same room and reviewers put it at gaming-laptop volume, though the app will slow the charge down to stop thatA2.
CPAP Overnight needs 320Wh; the DELTA 2 has 870Wh usable and finishes with 550Wh leftThe C300 DC has 245Wh usable and comes up 75Wh shortThe DELTA 2's fans spin up above roughly 120W and run 48–55dB at full loadA1
Why it mattersCPAP buyers take the DELTA 2, and do their recharging somewhere other than the bedroom.
The specific dimensions that decide these two units — everything else is a tie.
Your Life, Your Pick
Selected because: Six real loads run through both units: the DELTA 2 clears two of them, the SOLIX C300 DC clears none, and one of those failures is about output rather than capacity.
The C300 DC's 245Wh of usable energy is smaller than the smallest load on this list. That's six scenarios summarized honestly: the CPAP night at 320Wh is the closest it comes and it's still 75Wh short, and the tailgate at 670Wh fails twice over, once on total energy and again on a 400W peak its 300W rating can't meet.
The DELTA 2's misses are more interesting than its wins. It lands 40Wh under the 910Wh remote workday, a rounding error you fix by unplugging one thing. It covers 41% of a 2,100Wh camping weekend and 19% of a 4,685Wh van-life day, and solar doesn't close gaps that size. At their rated input ceilings the DELTA 2 puts 1,024Wh back in about two hours at 500W while the C300 DC needs closer to three for 288Wh at 100W. Sun helps the bigger unit more, not less.
Portability & Form Factor
Selected because: 6.17 lbs against 27 lbs is the entire case for the Anker, and it's a strong one if everything you own charges over USB-C.
weight
Twenty-seven pounds is a one-hand carry to the car and a two-hand carry up basement stairs. 6.17 lbs is a thing you forget is in the bag. That's not a tiebreaker on this page, it's the reason the C300 DC exists: reviewers describe a unit built without the AC inverter specifically to hold that weightB1.
The Anker also wins the one port that matters in a backpack, delivering 140W of USB-C against the DELTA 2's 100W at roughly a quarter of the weight. Two wins on the same axis, and the DELTA 2 has no answer to either of them. The trade is everything the inverter was there to do.
What the Specs Don't Tell You
Selected because: Once capacity is settled, three things decide this: a 20ms UPS switchover on one unit only, the DELTA 2's published 50dB, and a 288Wh ceiling that never moves.
Only the DELTA 2 does UPS, and 20ms is fast enough that a desktop PC or a router won't register the grid leaving. The C300 DC publishes no switchover time, which fits everything else about it. Things charge from it. They don't ride through it.
The card worth reading twice is the noise disclosure. The DELTA 2 publishes 50dB and the C300 DC publishes nothing, and a missing number is not a quiet unit, it's an unmeasured one. If this is going in a bedroom, that 50dB is the only figure either company has put its name to, and the sensible move is to find a hands-on account of the Anker rather than assume silence.
Lifetime Value
Selected because: Both are rated for 3,000 cycles, so the money question is only about how much energy you're spreading across them.
cost / lifetime kWh
Sixteen cents a lifetime kilowatt-hour against twenty-three. Both units carry the same 3,000-cycle rating, so that gap is purely a size effect: those cycles move 3,072 kWh through the DELTA 2 and 864 kWh through the C300 DC, and the price tag divides across very different denominators.
Warranty runs the other way and it's worth a sentence. Five years on the DELTA 2 against three on the C300 DC works out to $100 of purchase price per covered year against $67. The cheaper unit buys more coverage per dollar and less coverage in calendar time. If you're the owner who still has this thing in year four, the calendar is the number that matters.
Strengths & trade-offs
EcoFlow DELTA 2
Strengths
- +Larger battery capacity
- +Higher AC output
- +Longer warranty
- +Faster solar charging
Trade-offs
- –Substantially more expensive (+$299) than the SOLIX C300 DC.
- –Significantly heavier (+20.8 lbs), making it harder to move.
Anker SOLIX C300 DC
Strengths
- +Costs $299 less
- +Lighter by 20.8 lb
Trade-offs
- –Weaker inverter (-1,500W) limits appliance compatibility.
- –Sealed capacity — the DELTA 2 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
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 DELTA 2 doesn't have the energy either — 870Wh usable against 2,100Wh, 1,230Wh 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
Eight hours of a real house wants 1,645Wh and neither of these has it: the DELTA 2 runs out 775Wh early, the C300 DC 1,400Wh early. What separates them is the moment the lights go, since only the DELTA 2 switches over in 20ms and keeps a router or a PC alive through it. Neither is a whole-house answer. Only one is a bridge.
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
DELTA 2
The DELTA 2 takes this one with room left over: 320Wh needed against 870Wh usable puts 550Wh still in the tank by morning. The C300 DC reaches 245Wh usable and stops 75Wh short, which describes a machine that quits sometime before your alarm rather than one that never started. Seventy-five watt-hours is not a gap you can budget your way out of at 4 a.m.
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 finishes a 910Wh workday, but the two failures are different animals. The DELTA 2 stops 40Wh short, which is one monitor away from a pass. The C300 DC stops 665Wh short, which is most of the day.
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
DELTA 2
Output decides this one, not the battery. The load peaks at 400W and the C300 DC is rated for 300W, so it never gets going, while the DELTA 2 clears the 670Wh total with 200Wh to spare. Peaks are what kill undersized units, and they never announce themselves in the capacity spec.
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 DELTA 2 doesn't have the energy either — 870Wh usable against 4,685Wh, 3,815Wh 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 row is here for the SOLIX C300 DC's class of job: phones and a speaker, 100Wh across an afternoon. Both cover it — the SOLIX C300 DC finishes at 41% used, and the DELTA 2 barely notices it. For this job the DELTA 2's extra capacity is dead weight, not headroom; take the SOLIX C300 DC at 6.2 lbs and leave the rest at home.
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 DELTA 2 can run this load — the SOLIX C300 DC has no AC outlets for the wall-plug gear in it.
$499 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 0–58hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–11.6hHigh-Draw Appliances
These reveal the real limitsscale 0–0.9h¹ 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 DELTA 2, on Power Score margin
Buy the DELTA 2 unless every single thing you need to power charges over USB. It holds 1,024Wh against 288Wh and is rated for 1,800W continuous with 2,700W of surge behind it, against a 300W ceiling with no published surge figure at all. The $299 between them is real money, and if your load is a laptop, two phones and a camera battery, the SOLIX C300 DC is the better object and 21 pounds lighter. But the moment one appliance appears on the list, the C300 DC is out of the conversation and no amount of savings brings it back.
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 58 days ago. Prices move — check before you buy.
or check the SOLIX C300 DC price$199.99 list
Written by Wenny Zheng, Portable Power Tester · Station Arena Test Desk · Updated August 9, 2026
Measured Data
Benchmark scores and the full spec record, side by side.
Benchmark scores
Not rated for both units (minimum threshold unmet): UPS, RV Living, Home Backup, CPAP, Solar Generator, Tailgating, Food Truck.
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, DELTA 2 rates 4.1/5 (46th percentile of 27 Everyday-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.
50dB, and it's a recharge problem more than a discharge one
50dB is rainfall against a window, and it's the figure the DELTA 2 hits under load. Small overnight draws and a full-tilt refill are two different machines wearing the same badge. If it's sharing a bedroom, refill it during the day and in another room. That's the honest weakness of the unit we're recommending, and it's a scheduling problem rather than a dealbreaker.
SOLIX C300 DC: No AC Outlets At All
The SOLIX C300 DC's 300W is a DC port total — USB and 12V — not an inverter rating. Anything with a wall plug (a fridge, a TV, a coffee maker, most fans and lamps) never plugs in, at any wattage. That's the design, not a defect: it buys weight, silence, and efficiency for phone, laptop, camera, and 12V-CPAP loads. The DELTA 2 carries a real inverter behind 6 AC outlets, so it plays in both worlds. Decide which side of that line your gear lives on before weighing anything else on this page.
288Wh is the design, not the shortfall
The C300 DC is sealed at 288Wh and always will be, which only counts against it if you were planning to grow into something. Size it for what you carry and it's the right size by definition. The DELTA 2 is the one with somewhere to go: it takes EcoFlow expansion batteries, so its 1,024Wh reads as a floor rather than a ceiling. Work out which of those two sentences describes you and this section answers itself.
20ms of switchover, on one unit only
The DELTA 2 switches to battery in 20ms, comfortably under the point where a desktop PC, a router or a CPAP notices the grid has gone. The C300 DC publishes no switchover figure. Devices charge from it; they don't ride through it. If there's anything in the house you'd rather not reboot during a flicker, that's a one-unit decision.
Warranty: 5 Years vs 3
The DELTA 2 is covered for 5 years against the SOLIX C300 DC's 3 years. The cheaper SOLIX C300 DC does buy more warranty per dollar (15 years per $1,000 against 10), but that is a statement about price, not about coverage — if a fault appears in year 4, only one of these is still covered. An underrated factor if you're keeping this unit for years.
SOLIX C300 DC: Noise Level Not Disclosed
The DELTA 2 publishes its noise level (50dB); the SOLIX C300 DC doesn't publish one. That isn't evidence the SOLIX C300 DC is louder — it means there's no figure to hold it to, and no way to compare the two on this without hearing them. If you're buying for a bedroom, a CPAP, or an apartment, treat the DELTA 2's 50dB as the only published number on the table — a spec-sheet figure, not a measurement — and look for hands-on reports of the SOLIX C300 DC before deciding.
Full record above — the Test Desk pick is the DELTA 2.
Check DELTA 2 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 DELTA 2 is cheaper to own. At $0.16/kWh over its lifetime vs $0.23/kWh, the DELTA 2'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-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
Fast charging and the deepest catalogue in portable power, which is what actually matters at this size: the DELTA 2 sits in a range with real expansion batteries behind it. Ignore the enormous modular expansion ceilings you'll see quoted for EcoFlow's flagship home systems. Those belong to a different product line and have nothing to do with this unit.
Worth knowing
Support experiences are genuinely split: plenty of prepaid-label replacements handled without fuss, and a steady minority describing long waits or refurbished units against new claims. Buying through a retailer with its own returns process is cheap insurance on a $499 purchase.
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
Anker's value-per-watt-hour reputation is built on its mid-size and larger stations and doesn't automatically transfer down to this one. What the C300 DC has instead is the thing Anker is genuinely best at in consumer electronics: a light, well-ported charger you'd actually put in a bag and forget about.
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
Two different flavors of brand risk. EcoFlow's is polarized support on a unit expensive enough that you'd want a claim handled properly. Anker's is a support operation trending down from a historically high bar, on a unit cheap enough that replacing it is a real option. At $499 that question deserves weight. At $200 it mostly doesn't.
Growth path
DELTA 2
EXPANDABLESupports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 1,024Wh.
Accepts up to 500W of solar. Suitable for a 1-2 panel setup.
Generous port selection supports complex multi-device setups.
Expansion batteries are EcoFlow-specific. You're investing in the EcoFlow ecosystem.
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
The SOLIX C300 DC is sealed at 288Wh, which is fine if that covers you. The DELTA 2 starts at 1,024Wh 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 DELTA 2
Fan noise is the thing everyone who has lived with a DELTA 2 brings upA1A2A4. The fans trigger above about 120W and run 48–55dB at full load, which is why the standing advice for anyone powering medical gear with it is to put the unit outside the bedroom or run an extension cord inA1. At 1,200W of charging one reviewer put it at gaming-laptop volume, with the fix being to dial the charge rate down in the appA2. EcoFlow has said it intends to address the noise in a firmware update, which is a stated plan and not a shipped fixA4.
Everything else in the record is positive in the boring way you want from a battery. Sustained real-world testing across outages, camping trips and daily home-office use singled out fast charging, LiFePO4 reliability and the expansion pathA3.
“When charging at 1200W the fans sound like a gaming laptop, though you can lower the charging speed in the app to silence it.”
Sources
portablepowerlab.com
Anker SOLIX C300 DC
What exists on the C300 DC comes from reviewers more than long-term owners, and it all says one thing: this is a device chargerB1B4. Four USB-C ports, two USB-A and a 12V car socket, with two-way USB-C on PD 3.1 taking the unit back to 80% in about an hourB2. Owners praise the portability and report 288Wh covering several phone and laptop refills or a small light setupB3.
Notice what nobody in that record is doing: running appliances off it. The reviewers describe a unit built without the AC inverter to keep it near six poundsB1, so read that as the design brief rather than a test someone forgot to run.
“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 under moderate-to-high load is the dominant, repeatedly-cited complaint; the fan spins up above ~120W. [DELTA 2 · 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
“Fans trigger at anything above 120 watts; at maximum load (1,500–1,800W) they run continuously at ~48–55 dB. Powering medical equipment above 120W in a bedroom means listening to the fans or running an extension cable out of the room.”
portablepowerlab.com — EcoFlow Delta 2 Review: 6 Months of Real Use; PCWorld — EcoFlow Delta 2 review · 2026 · [negative]
- A2
“When charging at 1200W the fans sound like a gaming laptop, though you can lower the charging speed in the app to silence it.”
PCWorld — EcoFlow Delta 2 power station review · 2026 · [mixed]
- A3
“After 18 months of real-world testing through multiple power outages, camping trips, and daily home-office use, the unit earned recognition for fast charging, reliable LiFePO4 battery chemistry, and expandability.”
portablepowerlab.com — EcoFlow Delta 2 Review: 6 Months of Real Use · 2026 · [positive]
- A4
“EcoFlow officials indicated they plan to address the fan noise in an upcoming firmware update, as they have for other models after release.”
portablepowerlab.com — EcoFlow Delta 2 Review · 2026 (dated claim — may be partially addressed) · [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 August 9, 2026.
What Owners Actually Report
Drawn from 163 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 DELTA 2
224 claims from 155 comments · 178 from owners · 60 with figures
- Runtime
- 32 · 13% negative
- Price & value
- 38 · 4% negative
- Charging
- 17 · 23% negative
- Durability
- 22 · 67% negative
- Warranty & support
- 22 · 59% negative
What owners complain about
Ignores solar unless he unplugs it from the wall, so he switched to the AC180.
Solar inputowner63 agreedsource →
His Delta 2 went bad three months after purchase and EcoFlow agreed it was defective.
Durabilityownerafter 3 months236 agreedsource →
Past 30 days the five-year warranty only gets a refurbished unit covered for 30 days.
Warranty & supportowner236 agreedsource →
What owners praise
DELTA 2 plus extra battery and 600W solar cost ~$1200 and paid for itself in under 2 years in California.
Price & valuemeasuredowner736 agreedsource →
Batteries still hold 98%+ capacity, ahead of the 80%-at-10-years warranty curve.
Durabilitymeasuredowner736 agreedsource →
Gets 180-190W into it from a 100Ah LiFePO4 via XT60i cable, no converter needed.
Chargingmeasuredowner106 agreedsource →
Anker SOLIX C300 DC
12 claims from 8 comments · 10 from owners · 5 with figures
- Solar input
- 4 · 100% negative
- Runtime
- 2 · 0% negative
- Charging
- 2 · 39% negative
- Other
- 1 · 0% negative
- Size & weight
- 1 · 0% negative
What owners complain about
28V input ceiling blocks a 25.6V LiFePO4 bank, which can reach 29.2V fully charged.
Solar inputmeasuredowner4 agreedsource →
Says the C300 DC has no pass-through charging and just cycles between 98% and 100%.
Charging7 agreedsource →
DC5521 plugs with poor tolerances have heated up at 5A; wishes it used XT60 throughout.
Build qualityownersource →
What owners praise
BiPAP with heated hose and humidifier at 80% used 47% of the 288Wh pack over 5 hours of sleep.
Runtimemeasuredowner5 agreedsource →
Can be charged over USB-C at up to 140W, which he thinks is fantastic.
Chargingmeasuredownersource →
His favorite unit: small, transportable, very efficient on 12V and charges well off solar.
Otherownersource →
Claims are weighted by how specific they are, whether the commenter owns the unit, and how many readers agreed. Comments that mention a product under a rival's review count for more, because the commenter had no reason to be there. This is what buyers report, not our test results — for measurements we ran ourselves, see the methodology.
Who Should Buy Which
Buy the DELTA 2 if you…
- →Anyone whose outage list has a wall plug on it. A router, a laptop brick, a CPAP, a 400W tailgate rig: the DELTA 2 is the only one of these two that addresses them, and its 20ms switchover keeps the PC under your desk up when the grid drops.
- →The buyer who suspects 1,024Wh won't be enough in two years. It takes EcoFlow expansion batteries. The C300 DC is 288Wh permanently.
- →The camper who wants the fastest refill from a panel. 500W of solar input against 100W takes back five times the energy per hour of sun.
Buy the SOLIX C300 DC if you…
- →The person whose whole kit ends in USB-C. Laptop, phones, camera batteries, a headlamp: 140W out of a single port, 288Wh in reserve, 6.17 lbs in the bag, $200.
- →The second-battery buyer who already owns a big station at home and wants something they'll actually carry.
- →Anyone who values the weight over the sockets. Taking the inverter out is the whole productB1, and if you were never going to use it, you were never going to miss it.
If neither fits
If your day looks like the camping weekend at 2,100Wh, the eight-hour blackout at 1,645Wh, or van life at 4,685Wh, close both tabs. The DELTA 2 covers 41% of that camping weekend and 19% of the van-life day; the C300 DC covers 12% and 5%. You want a station sized past that 2,100Wh weekend with real expansion behind it, not the better of two units that both come up short.
The Bottom Line
Take the DELTA 2 unless everything you own charges over USB-C. The tailgate scenario is this whole page in miniature: a 400W peak that the DELTA 2 answers with 2,700W of surge and the C300 DC can't meet at all on a 300W rating with no published headroom above it. Capacity was never the number that decided this. Output was.
And if your kit really is all USB-C, buy the Anker cheerfully. 6.17 lbs, 140W out of one port, $200, and it's genuinely the better thing to carry. Just don't buy it expecting to plug an appliance into it. Look at your list, count the wall plugs, and let that pick for you.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Does the Anker SOLIX C300 DC have AC outlets?
Our spec sheet and the published reviews don't agree, so confirm the port layout on the listing before you buy. The spec table lists 300W of output with no surge figure; the review record describes a unit that removes the AC inverter entirely to keep weight near six pounds. Either way the practical answer is identical: 300W is the ceiling, there's no published headroom above it, and nothing that draws like an appliance is going to run.
Can the SOLIX C300 DC run a CPAP overnight?
No, and it's frustratingly close. The overnight scenario needs 320Wh and the C300 DC has 245Wh usable out of its 288Wh, so it stops 75Wh short. The DELTA 2 covers the same night and still has 550Wh in the morning.
Is the EcoFlow DELTA 2 too loud to sleep next to?
At a CPAP-level load, no. It publishes 50dB and its fans come on above roughly 120W; to average 120W across a 320Wh night you'd have to be finished in under three hours. Charging is the loud part rather than discharging, so plug it in during the day and somewhere else.
Which one is cheaper to own?
The DELTA 2, measured per unit of energy delivered. Both carry a 3,000-cycle rating, but the DELTA 2 moves 3,072 kWh across that life against the C300 DC's 864 kWh, which works out to $0.16 per lifetime kilowatt-hour against $0.23. The $299 you save buying the Anker is still real money, so this only favors the DELTA 2 if you'd actually have used the capacity.
Can I add more capacity to the SOLIX C300 DC later?
No. It's sealed at 288Wh with no expansion option, so size it for what you need on day one. The DELTA 2 accepts EcoFlow expansion batteries if you think 1,024Wh might not hold you.
Where to buy
EcoFlow DELTA 2Pick
$499.00
$499.00 · direct from EcoFlow
Last checked 58 days ago. Prices move — check before you buy.
Anker SOLIX C300 DC
$199.99
$199.99 · direct from Anker
Last checked 1 day ago. Prices move — check before you buy.
Prices may vary by retailer and are subject to change.