Head-to-head test
EcoFlow DELTA 3 Ultra Plus vs Anker SOLIX C300 DC
The SOLIX C300 DC has no AC outlets at all, so this comes down to one look at the gear you're powering: if anything on the list ends in a wall plug, the DELTA 3 Ultra Plus is the only one of the two that answers, and no capacity figure outvotes that.
Full profiles: EcoFlow DELTA 3 Ultra Plus → · Anker SOLIX C300 DC →
Written by Ian SchneiderUpdated
Solar & Off-Grid Tester, Station Arena Test Desk
Spec deltas
The SOLIX C300 DC has zero AC outlets. Not few, not weak: none. Its 300W is a total across its DC ports rather than an inverter rating, so a fridge, a TV, a lamp or a box fan never plugs into it at any wattage, and that one line settles five of the seven load profiles on this page before anyone mentions watt-hours.
The DELTA 3 Ultra Plus is built from the opposite premise: 3,072Wh behind six AC outlets, 3,600W of continuous output with 7,200W of surge above it, and a UPS mode rated no worse than 10ms for the desktop or the router. It weighs 74.3 lbs. That is what carrying an inverter and a pack this size costs you, and it's why the C300 DC gets to be 6.17 lbs.
So the page isn't really a contest, and pretending otherwise would waste your time. At $1,599 the DELTA 3 Ultra Plus is the general-purpose machine here. At $200 the C300 DC is a lighter answer to a different question, which is a compliment rather than a hedge. Look at what you're plugging in, then read the half of this page that applies to you.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
continuous output
And if you were shopping by energy anyway, the small unit isn't the value play: it's the pricier of the two per watt-hour of capacity. You aren't buying less power station for less money. You're buying a device that does a different job, and it happens to do that job well.
SOLIX C300 DC: 0 AC outlets, and its 300W is a DC port total, not an inverter ratingDELTA 3 Ultra Plus: 6 AC outlets, 3,600W continuous, 7,200W surgeCatalogue cost per watt-hour of capacity: $.69 for the SOLIX C300 DC against $.52 for the DELTA 3 Ultra Plus
Why it mattersAnyone reading the C300 DC as the affordable version of the same idea should stop there and price the job instead of the box.
solar input
That inverts the assumption people bring to a multi-day outage, where the second morning matters more than the first night. The DELTA 3 Ultra Plus can replace a whole eight-hour outage's draw inside a single good morning and go into day two full, while the C300 DC spends most of an afternoon restoring a pack that was never going to reach the fridge anyway.
DELTA 3 Ultra Plus: 1,600W maximum solar input into a 3,072Wh packSOLIX C300 DC: 100W maximum solar input into a 288Wh packThe 8-Hour Blackout profile draws 1,645Wh; the DELTA 3 Ultra Plus finishes it with 966Wh of its 2,611Wh usable still in the pack
Why it mattersIf you're buying for storms rather than picnics, weigh solar input as heavily as capacity — it's the spec that decides whether day three looks like day one.
Which means there is no USB-only job on this page where its extra 2,784Wh does anything except add 68 lbs to whatever you're carrying. A laptop, a couple of phones and a camera kit take the same charge from either unit, and only one of them fits in a daypack.
SOLIX C300 DC: 4 USB-C ports rated 140W, 140W, 100W and 15W, plus 2 USB-A, in a 6.17 lb bodyDELTA 3 Ultra Plus: 2 USB-C ports topping out at 140W, plus 2 USB-A, in a 74.3 lb bodyAfternoon Off-Grid (100Wh of phones and a speaker) is covered by both units, leaving the C300 DC at 41% used
Why it mattersIf your whole list charges over USB, buy the small one and don't think of it as settling for less.
The specific dimensions that decide these two units — everything else is a tie.
What the Specs Don't Tell You
Selected because: The card about outlets decides this page: six on the DELTA 3 Ultra Plus, zero on the SOLIX C300 DC, and everything else is detail arranged around it.
rated cycles
One card here is the page and the rest are footnotes. The SOLIX C300 DC's outlet count is an affirmative zero, so the question isn't how much of a load it can take — it's whether your gear can reach it at all. Read that card first, decide which side of the line your equipment lives on, and most of this comparison answers itself.
Our own pick collects the other warning, and it's a fair one: 74.3 lbs. That's a set-it-down-once weight, and our spec record doesn't track whether this one rolls, so look at the product photos before you plan on hauling it anywhere. The C300 DC picks up a fixed-capacity note at 288Wh, which is true and largely beside the point — nobody buys a 6.17 lb unit expecting it to grow into home backup.
Your Life, Your Pick
Selected because: Five of the seven load profiles are settled by whether the gear plugs in, one is beyond both units, and one goes to the lighter one.
Camping, blackout, workday, tailgate, van life: in five of these the C300 DC is out not because 288Wh is small but because the box fan, the fridge, the monitor and the blender all end in a plug. The DELTA 3 Ultra Plus clears four of those five without ever spending more than 80% of its usable pack, and one reviewer ran a laptop, a desktop workstation and monitors for a full eight-hour day and still had 40% leftA5, on a harder kit than our workday profile assumes.
The two honest rows are at the ends. Full-time van draw is 4,685Wh a day and the DELTA 3 Ultra Plus is 2,074Wh short of it, so that buyer needs a bigger platform or an expansion battery rather than either of these. And the afternoon row, 100Wh of phones and a speaker, is the one both units cover — where the DELTA's extra capacity stops being headroom and becomes something you carried for no reason.
Portability & Form Factor
Selected because: 74.3 lbs against 6.17 lbs is what the C300 DC bought with everything it gave up, and it's the reason both units exist.
weight
The 68 lbs between these two units is not a quality gap. It's an inverter, six sockets and the cells to feed them, priced in pounds. Anker left all of that out on purpose and got a power station you carry in one hand; EcoFlow put it in and got one that runs a house circuit's worth of appliances. Both decisions are correct, for different weekends.
Where it bites is the difference between planning a trip and planning a lift. The C300 DC goes in the daypack with the camera bodies and you forget it's there. The DELTA 3 Ultra Plus goes wherever you can set it down and would rather stay put, which makes it a magnificent basement or garage unit and a chore at a trailhead.
Lifetime Value
Selected because: The cheaper unit is the more expensive one per watt-hour of capacity, which is worth seeing before the word affordable does your deciding.
cost / lifetime kWh
Thirteen cents a kilowatt-hour across its rated life, against twenty-three. The flagship is the cheaper machine to own per unit of energy, and it holds that lead on capacity cost too, so "cheap" and "cheaper" point at different units here. Read the table once and it stops being surprising: 4,000 cycles over 3,072Wh is 12,288 kWh of lifetime energy, against 864 kWh from 3,000 cycles over 288Wh.
The caution is the one every per-kWh comparison needs. You can't spend energy you never needed, and 864 kWh is a lifetime of phone and laptop charges for the person who only ever wanted phone and laptop charges. Per-kWh cost is the right yardstick when both units could do the job and you're choosing between them; on this pair it's mostly a warning not to mistake the smaller price for better value.
Strengths & trade-offs
EcoFlow DELTA 3 Ultra Plus
Strengths
- +Larger battery capacity
- +Higher AC output
- +Longer warranty
- +Faster solar charging
- +Rated for 4,000 charge cycles — much longer battery lifespan
Trade-offs
- –Substantially more expensive (+$1,399) than the SOLIX C300 DC.
- –Significantly heavier (+68.1 lbs), making it harder to move.
Anker SOLIX C300 DC
Strengths
- +Costs $1,399 less
- +Lighter by 68.1 lb
Trade-offs
- –Weaker inverter (-3,300W) limits appliance compatibility.
- –Sealed capacity — the DELTA 3 Ultra Plus can add batteries to grow past 288Wh; this one can't.
- –Shorter-lived battery — rated for 3,000 charge cycles vs the DELTA 3 Ultra Plus's 4,000, so it wears out sooner.
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
DELTA 3 Ultra Plus
The led lights and the box fan in this profile both end in a wall plug, and the C300 DC has nowhere to put one. The DELTA 3 Ultra Plus takes the weekend at 80% of its usable pack and still holds 511Wh on Sunday night, which is enough margin that one extra phone or one cold night doesn't change the plan.
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
DELTA 3 Ultra Plus
A fridge doesn't care what you paid; it cares whether there's a socket. Only one of these has six, and it finishes the eight hours with energy still in the pack rather than scraping in. The C300 DC's problem in this row isn't its 288Wh. It's that the fridge can't reach it.
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 3 Ultra Plus
Two feet from your head all night is the one job where capacity barely matters, and the DELTA 3 Ultra Plus covers the 320Wh night on 12% of its pack. The C300 DC doesn't finish it: 245Wh usable against 320Wh leaves it 75Wh short, about three-quarters of the night. A CPAP that ends in a wall plug has nothing to plug into here regardless.
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
DELTA 3 Ultra Plus
The external monitor and the router settle this row before the laptops are counted, since both want an outlet and the C300 DC hasn't got one. The DELTA 3 Ultra Plus spends 35% of its usable pack on the day and leaves 1,701Wh for the evening you didn't plan for.
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 3 Ultra Plus
The blender peaks at 400W here, which the DELTA 3 Ultra Plus starts without thinking about, and both the blender and the TV need an outlet — which is where this row ends for the C300 DC. The big unit spends about a quarter of its usable pack on the afternoon and finishes with 1,941Wh.
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
Nobody wins this one. Full-time van draw is 4,685Wh a day, and the DELTA 3 Ultra Plus runs 2,074Wh short of it with everything it has, while the C300 DC's mini-fridge and lights never find a socket in the first place. If this is your profile, you're shopping for a bigger platform or an expansion battery, not between these two.
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
Phones and a speaker for an afternoon is 100Wh, and both units do it without breathing hard — the C300 DC finishes at 41% used. On this row the DELTA 3 Ultra Plus's extra capacity isn't headroom, it's battery you carried to a picnic for nothing. Take the small one 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 3 Ultra Plus can run this load — the SOLIX C300 DC has no AC outlets for the wall-plug gear in it.
$1,599 list · direct from EcoFlow
Planning for more than this? Describe your whole setup and get it sized →
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 0–174.1hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–34.8hHigh-Draw Appliances
These reveal the real limitsscale 0–2.6h¹ 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 19, 2026
Verdict: the DELTA 3 Ultra Plus, on Power Score margin
Take the DELTA 3 Ultra Plus, with one condition attached. The SOLIX C300 DC carries no AC outlets and its 300W is a total across its DC ports rather than an inverter rating, which is the design and the reason it weighs 6.17 lbs. It also means five of the seven load profiles on this page are settled before capacity is discussed: the fridge, the monitor, the box fan and the blender have nowhere to go. If your list has a wall plug on it, the DELTA 3 Ultra Plus answers it with room left over, taking an eight-hour outage and finishing with 966Wh in hand. If your list is phones, laptops and camera batteries, buy the C300 DC and keep the difference. On the one profile here that both units cover, the big machine's extra energy is weight rather than headroom. The confidence sits at moderate not because the hardware is close, but because your gear decides this, not the specs.
Editor-assigned confidence, based on cited owner research and spec analysis.
List prices as of September 19, 2026. The links below open EcoFlow's and Anker's current prices.
$1,599.00 · direct from EcoFlow
Last checked 28 days ago. Prices move — check before you buy.
or check the SOLIX C300 DC price$349.99 list
Written by Ian Schneider, Solar & Off-Grid Tester · Station Arena Test Desk · Updated September 19, 2026
Black Friday · 26 days out
Prices to beat:DELTA 3 Ultra Plus $1,499SOLIX C300 DC $200
The lowest we have recorded for each. We have never seen the SOLIX C300 DC discounted, so any real cut on it would be a first.
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, Solar Generator, Tailgating, Food Truck, Apartment Balcony, Camping.
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 3 Ultra Plus rates 4.9/5 (96th percentile of 28 Large-class units), and SOLIX C300 DC rates 4.4/5 (67th percentile of 25 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.
74.3 lbs: Plan the Lift, Not Just the Trip
74.3 lbs isn't a carry, it's a move. You pick this up once, put it where it's going to live, and plan around it after that, which is fine in a basement and a nuisance at a trailhead. It's also simply what a 3,600W inverter and 3,072Wh of cells weigh. Our spec record doesn't track wheels or a telescoping handle, and at this weight that one detail changes the whole job, so check the product photos before you count on moving it far. The C300 DC is 6.17 lbs, and that gap is the honest cost of the outlets.
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 3 Ultra Plus carries a real inverter behind 4 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.
SOLIX C300 DC: Fixed Capacity
The SOLIX C300 DC is sealed at 288Wh — fine if that covers you, but it's the ceiling. By contrast the DELTA 3 Ultra Plus can add expansion batteries, though the first thing it has over the SOLIX C300 DC is its own 3,072Wh base — expansion is the step after that, for the buyer who would outgrow 3,072Wh as well.
Only the DELTA 3 Ultra Plus Lists a UPS Mode
The DELTA 3 Ultra Plus can sit between the wall and your gear and hand it to battery when the grid drops — rated ≤10ms — quick enough on paper that desktop PCs and routers should ride through, treating that as the rating it is. Worth it for a router, a desktop PC, or a CPAP. The SOLIX C300 DC's spec sheet lists no UPS mode, so anything plugged into it rides an outage only as far as your reaction time.
Warranty: 5 Years vs 3
The DELTA 3 Ultra Plus 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 3.1), 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.
Battery Lifespan in Real Years
The DELTA 3 Ultra Plus is rated for 4,000 cycles vs 3,000. In real life: at daily use, that's 11 vs 8.2 years. At weekend use (twice a week), it's 38 vs 29 years. One caution reading years across different sizes: a cycle is 3,072Wh on the DELTA 3 Ultra Plus and 288Wh on the SOLIX C300 DC, so count lifetime energy — roughly 12,288 kWh against 864 kWh over the rated life. After hitting the cycle limit, the battery doesn't die — it drops to ~80% of original capacity, which is still very usable.
SOLIX C300 DC: Noise Level Not Disclosed
The DELTA 3 Ultra Plus publishes its noise level (30dB); 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 3 Ultra Plus's 30dB 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 3 Ultra Plus.
Check DELTA 3 Ultra Plus 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 3 Ultra Plus is cheaper to own. At $0.13/kWh over its lifetime vs $0.23/kWh, the DELTA 3 Ultra Plus's higher cycle life and capacity make each dollar go further over the years.
Delivers each lifetime kWh for $0.10 less — check the DELTA 3 Ultra Plus 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 top of the range sit two whole-home paths: the TITAN line, one 5 kWh unit that grows to 30 kWh, and the DELTA Pro Ultra platform, which stacks batteries and inverters further — flagship paths, not line-wide features.
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
DELTA 3 Ultra Plus
EXPANDABLESupports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 3,072Wh.
Accepts up to 1,600W of solar. Enough for a serious multi-panel array.
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 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 3 Ultra Plus starts at 3,072Wh and can grow beyond it with EcoFlow expansion batteries — real headroom the SOLIX C300 DC doesn't have if your needs climb toward partial-home backup.
What Owners Report
Patterns from published owner reports and long-term reviews — every claim cited to its source below.
EcoFlow DELTA 3 Ultra Plus
Treat the field record here as early rather than settled: this model is new enough that our research found no long-term forum or owner threads, and what exists comes from review sites testing over days and weeks rather than people who have lived with one through a winterA0. No cold-weather accounts, no idle-drain figures, no firmware histories yet.
What those reviews agree on is the fan. Reviewers consistently describe it as quiet even under sustained heavy load, comparable to EcoFlow's top-of-range platformA1A2A13. Pass-through behaved too: reviewers report no dip or shut-off when the wall power was pulledA6, and output isn't throttled to match input wattage the way many stations doA4. Build quality reads as substantial rather than fragile, with a rated tolerance for short drops and dew-level moistureA8A14. Two honest gripes: the weight gets flagged as thunderous by the same reviewers who liked everything elseA9, and the screen washes out in direct sun badly enough that one reviewer resorted to cupping their hands around itA7.
“even when you're pushing it hard, the DELTA 3 Ultra Plus runs much quieter than older EcoFlow models, like the DELTA 2 Max”
Sources
thesolarlab.com · postperspective.com · appleinsider.com · digitaltrends.com · storagereview.com
Anker SOLIX C300 DC
The C300 DC's record is thin and skewed toward reviewers rather than long-term owners, with our own coverage note flagging the one confusion worth avoiding: this is the DC-only unit, distinct from the AC-equipped C300, and the C200 DC is its smaller siblingB0. Buyers who mix those up are the reason this page exists.
What owner commentary there is praises exactly what the design targets: portability, and enough capacity to refill a phone and a laptop several times overB3. Reviewers frame it the same way, as a device-charging unit for travelers rather than something to run appliances fromB1B4, and they report the two-way USB-C bringing the unit itself back to 80% in about an hourB2. Nobody who tested it expected it to behave like a power station with an inverter, and nobody was disappointed that it didn't.
“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
- Professional reviewers consistently describe the fan noise as very quiet even under heavy load, comparable to EcoFlow's premium DELTA Pro Ultra line. [DELTA 3 Ultra Plus · 3 entries]
- Reviewers report solid UPS/pass-through charging performance with no noticeable switchover issues or output throttling tied to input wattage. [DELTA 3 Ultra Plus · 2 entries]
- The unit's high weight (~74 lbs) and premium MSRP are repeatedly flagged as drawbacks, though discounted street pricing is seen as making the value proposition much stronger. [DELTA 3 Ultra Plus · 3 entries]
- Build quality/durability is praised as substantial and non-fragile across multiple independent reviews. [DELTA 3 Ultra Plus · 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
“even when you're pushing it hard, the DELTA 3 Ultra Plus runs much quieter than older EcoFlow models, like the DELTA 2 Max”
thesolarlab.com — EcoFlow DELTA 3 Ultra Plus Review: The Ultimate DELTA? · unknown · [positive]
- A2
“we'd probably say the noise it creates is similar to what you hear when you run the DELTA Pro Ultra, which is pretty amazing”
thesolarlab.com — EcoFlow DELTA 3 Ultra Plus Review: The Ultimate DELTA? · unknown · [positive]
- A4
“Many power stations limit you to the input wattage when outputting power, but this EcoFlow power station does not”
thesolarlab.com — EcoFlow DELTA 3 Ultra Plus Review: The Ultimate DELTA? · unknown · [positive]
- A5
“I was able to work remotely for an eight-hour day with 40% power left, which included running my laptop, desktop workstation and monitors”
postperspective.com — Review: EcoFlow Delta 3 Ultra Plus Portable Power Station · 2026-04 · [positive]
- A6
“I didn't experience any shut-offs or dips when I unplugged the EcoFlow from the wall”
postperspective.com — Review: EcoFlow Delta 3 Ultra Plus Portable Power Station · 2026-04 · [positive]
- A7
“while facing the sun, I had to employ the classic "cup hands cover" maneuver to get a clear look at the screen status”
appleinsider.com — EcoFlow Delta 3 Ultra Plus review: Premium, but solid power · 2025-11 · [mixed]
- A8
“It does not feel cheap or fragile. Everything from the outer shell case to the plastic buttons and the AC cable feels substantial and durable”
appleinsider.com — EcoFlow Delta 3 Ultra Plus review: Premium, but solid power · 2025-11 · [positive]
- A9
“Weighing in at a thunderous 74 pounds, the Ultra is not considered lightweight by any standards”
appleinsider.com — EcoFlow Delta 3 Ultra Plus review: Premium, but solid power · 2025-11 · [mixed]
- A13
“Each unit operates quietly at under 25dB, remaining unobtrusive even during sustained loads”
storagereview.com — EcoFlow DELTA 3 Max Plus & Ultra Plus Review · 2025-09-30 · [positive]
- A14
“the Delta 3 Ultra Plus can withstand drops of up to 0.2m, and both models feature moisture resistance to mitigate risks from overnight dew”
storagereview.com — EcoFlow DELTA 3 Max Plus & Ultra Plus Review · 2025-09-30 · [positive]
- B1
“A 288Wh unit that ditches the heavy AC inverter to focus on DC power, keeping it very light at about 6.2 lbs.”
the-gadgeteer.com / forbes.com — SOLIX C300 DC review · 2026 · [positive]
- B2
“Offers 2 USB-A and 4 USB-C ports plus a 12V car socket; two-way USB-C with PD 3.1 recharges the unit to 80% in about 1 hour.”
androidpolice.com / batteryessence.com — SOLIX C300 DC review · 2026 · [positive]
- B3
“Owners praise its portability and capacity — enough to charge a phone and laptop several times, run a fan for hours, or power a small light setup.”
bestbuy.com owner reviews — SOLIX C300 DC / C300X · 2026 · [positive]
- B4
“A DC-focused design with app integration and solar support — best for modern travelers charging devices, not running AC appliances.”
androidpolice.com / campingsolar.us — SOLIX C300 DC review · 2026 · [mixed]
Research compiled September 19, 2026.
Who Should Buy Which
Buy the DELTA 3 Ultra Plus if you…
- →Anyone whose outage list has a plug on it: a fridge, a router and modem, a couple of lamps. Eight hours of that costs it under two-thirds of its usable energy.
- →The person running a desktop or a workstation, where a transfer rated no worse than 10ms is the difference between riding out a flicker and losing an afternoon's work.
- →The tailgate or jobsite buyer with a 400W peak to start and a TV to keep running, who has somewhere to set 74.3 lbs down and no intention of carrying it far.
- →Anyone whose CPAP plugs into a wall socket. The overnight profile costs this unit 12% of its pack.
Buy the SOLIX C300 DC if you…
- →Photographers and laptop travelers: four USB-C ports, two of them at 140W, and 6.17 lbs you can put in a daypack with the camera bodies.
- →The hiker, the bike tourer, the overlander — anyone for whom the weight of the thing is the spec that gets used every single day.
- →The person who already owns a big station and wants a light second battery for the tent, rather than a second big station.
If neither fits
Full-time van dwellers should skip both: that profile draws 4,685Wh a day and even the DELTA 3 Ultra Plus lands 2,074Wh short, so you want a larger platform or an expansion battery sized to the daily load rather than either unit as bought. And if you like the C300 DC's size but need one wall socket, don't force it — Anker also sells the AC-equipped C300, which is a different unit from this DC-only oneB0.
The Bottom Line
Six outlets against none. That's the page, and everything else is arranged around it. The DELTA 3 Ultra Plus is the general-purpose machine: it runs the fridge and the monitor and the blender, holds a transfer rated no worse than 10ms for the desktop, and — the part people get backwards — refills from a full panel array quicker than the small unit does, despite carrying more than ten times the battery.
The C300 DC is not the budget version of that. It's a different tool that happens to sit on the same shelf, and a good one for the person whose entire list charges over USB and who would rather carry the thing one-handed. So look at what you're plugging in. If it ends in a wall plug, buy the DELTA 3 Ultra Plus and find someone to help you lift it.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Does the Anker SOLIX C300 DC have AC outlets?
No. Its record shows zero AC outlets, and the 300W figure on the spec sheet is a total across its DC ports rather than an inverter rating. That means anything with a wall plug never connects to it, at any wattage. Anker sells a separate AC-equipped C300 for buyers who want a socket in this size class.
Can the SOLIX C300 DC run a CPAP overnight?
Not the overnight profile we model. That night draws 320Wh and the C300 DC has 245Wh usable after the flat derate we apply to every unit, so it comes up 75Wh short and covers about three-quarters of the night. A CPAP that plugs into a wall outlet also has nothing to plug into on this unit. The DELTA 3 Ultra Plus covers the same night on 12% of its pack.
Is the DELTA 3 Ultra Plus too heavy to be portable?
At 74.3 lbs it's portable the way a full checked bag is portable: one person can move it, but they'll plan the route. Reviewers who liked the unit still flagged the weight as its main drawback. Our spec record doesn't track wheels or a telescoping handle, so check the product photos before you count on rolling it.
Which one is better value for the money?
The DELTA 3 Ultra Plus, on both of the yardsticks that hold up: it costs less per watt-hour of capacity and less per kilowatt-hour across its rated life, since 4,000 cycles over a 3,072Wh pack comes to 12,288 kWh of lifetime energy against 864 kWh for the C300 DC. The catch is that value only counts for energy you'd actually use. If your real demand is phones and a laptop, the cheaper unit's 864 kWh will outlast your interest in the question.
Can either unit keep a fridge running in a blackout?
Only the DELTA 3 Ultra Plus. The eight-hour profile, fridge plus router and modem and a few small loads, draws 1,645Wh, and the DELTA 3 Ultra Plus covers it on about 63% of its 2,611Wh of usable energy. The fridge can't reach the C300 DC at all, because there's no AC outlet on it to plug into.
Where to buy
EcoFlow DELTA 3 Ultra PlusPick
$1,599.00
$1,599.00 · direct from EcoFlow
Last checked 28 days ago. Prices move — check before you buy.
Anker SOLIX C300 DC
$349.99
$349.99 · direct from Anker
Last checked 28 days ago. Prices move — check before you buy.
Prices may vary by retailer and are subject to change.