Head-to-head test
EcoFlow DELTA Pro 3 vs Anker SOLIX C300 DC
The SOLIX C300 DC has no AC outlets at all, so this was never a capacity comparison: it's a question about connectors, and the right unit is whichever one your gear can physically plug into.
Full profiles: EcoFlow DELTA Pro 3 → · Anker SOLIX C300 DC →
Written by Gunner GustafsonUpdated
Whole-Home Backup Tester, Station Arena Test Desk
Spec deltas
The SOLIX C300 DC has zero AC outlets. Not a small inverter or a weak one: our record carries a flat zero on AC sockets, because the unit ships without an inverter at allB0B1. Its 300W rating is a DC port total across USB and 12V, not a wall-plug rating, so a fridge, a coffee maker or a lamp with a two-prong plug never connects to it at any wattage.
That makes the DELTA Pro 3 the answer to the question most people arrive here with. It carries a real inverter behind five AC outlets, two 240V sockets and a 30A RV socket, 4,000W continuous with a published 6,000W peak, on top of a 4,096Wh pack. The eight-hour blackout profile on this page draws 1,645Wh across a fridge, a router and a modem. The Pro 3 ends that night with 1,837Wh unused.
None of which makes the C300 DC a lesser product, and this is the part worth slowing down for. It's a 288Wh, 6.17 lb DC box for phones, laptops, cameras and headlamps, and at the port you'd actually use it beats the flagship: four USB-C ports with the top two rated 140W, against two rated 100W on the $2,799 unit. The fork is real, and choosing the wrong side of it is the only expensive mistake available here.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
continuous output
A DC-only unit ten times its size would fail that row for exactly the same reason, which is why this page can't be read as big against small. The Pro 3 finishes the night with 1,837Wh spare, and the margin is almost beside the point: it's the only one of the two with a socket the fridge fits.
The SOLIX C300 DC's record lists 0 AC outlets and no inverter; its 300W is a DC port total across USB and 12VThe DELTA Pro 3 lists 5 AC outlets, two 240V sockets and a 30A RV socket behind 4,000W continuous, 6,000W published peakThe 8-Hour Blackout profile draws 1,645Wh across a fridge, a router and a modem, peaking at 150W
Why it mattersIf a fridge is on your outage list, the C300 DC is out before you compare a single watt-hour.
For a kit that lives entirely on USB-C, paying $2,599 more buys a worse desk and another 106 lbs to move (112.4 against 6.17). Every advantage the flagship holds is on the AC side of the line. On the DC side it's the one being outgunned.
The SOLIX C300 DC has 4 USB-C ports rated 140W, 140W, 100W and 15W, plus 2 USB-AThe DELTA Pro 3 has 2 USB-C ports with a 100W ceilingReviewers report two-way USB-C on the C300 DC over PD 3.1, refilling the unit itself to about 80% in an hourB2
Why it mattersA remote worker with no wall-plug gear should buy the C300 DC and close the capacity charts.
cost / lifetime kWh
Cheap energy is only cheap where you can use it. Roughly nineteen times the lifetime energy (16,384 kWh against 864) at a lower cost per kilowatt-hour is a powerful argument for a unit that sits in one room through eleven years of daily cycling, and no argument whatsoever for the campsite rows, where the weight decides everything before the arithmetic starts.
DELTA Pro 3: 4,000 rated cycles on a 4,096Wh pack, about 16,384 kWh of lifetime energySOLIX C300 DC: 3,000 rated cycles on 288Wh, about 864 kWh$0.17 per lifetime kWh against $0.23The DELTA Pro 3 is a stationary 112.4 lb unit, and the Weekend Camping, Tailgate Party and Van Life Daily rows all read neither
Why it mattersBuy the Pro 3 as a fixture in the house, not as something you load into a car.
Nothing fixes that, because 288Wh is the ceiling and there's nothing to bolt on. A buyer who wants the small light box for a CPAP has to move up a class rather than up a size, and the Pro 3 is the unit here that also holds the router through the same outage.
CPAP Overnight needs 320Wh; the C300 DC shows 245Wh usable after the flat 85% derate applied to every unit on this site, leaving it 75Wh shortThe C300 DC is sealed at 288Wh with no expansionThe DELTA Pro 3 covers the same night at 9% used and lists a UPS mode rated no worse than 10ms
Why it mattersIf you're buying to breathe through a blackout, skip the C300 DC even though it's the right shape.
The specific dimensions that decide these two units — everything else is a tie.
What the Specs Don't Tell You
Selected because: One card decides this page: the SOLIX C300 DC records zero AC outlets, and nothing further down changes what that rules out.
rated cycles
One card here does all the work, and it's the one that says no AC outlets. Read it as a description of a category rather than a fault. Anker took the inverter out to get the thing down near 6 lbs, and that trade is why it fits in the top of a daypackB1. Everything else on this list is ordinary flagship business: 112.4 lbs is a two-person lift, and a UPS mode rated no worse than 10ms is the kind of feature you only miss once.
On noise, only one figure exists at all. The Pro 3 publishes 30dB as a spec-sheet number and the C300 DC publishes nothing, which is a hole in the record rather than evidence about either fan. If the unit is going in a bedroom, that's a reason to hunt for hands-on reports, not a reason to pick.
Your Life, Your Pick
Selected because: The rows sort these two by job rather than by size: three go to the DELTA Pro 3, three read neither, and the 100Wh afternoon is covered by both.
Three of the seven rows read neither, and they're the three that involve leaving the house. Weekend camping wants 2,100Wh at a site: the Pro 3 has the energy and doesn't travel, the C300 DC travels beautifully and has no socket for the lights or the box fan. Van life daily wants 4,685Wh and the Pro 3 itself lands 1,203Wh short. This page is a fork with a hole in the middle, and pretending otherwise would cost somebody a weekend.
The row worth stopping on is the 100Wh afternoon of phones and a speaker. Both units cover it, the C300 DC finishing at 41% used with 145Wh still in hand, and it's the only row where 4,096Wh is cargo instead of headroom. That afternoon is the C300 DC's actual customer, and it handles it with room left over.
Portability & Form Factor
Selected because: 112.4 lbs against 6.17 lbs is the other half of the fork: one unit picks a spot and stays there, the other rides in a daypack.
weight
112.4 lbs against 6.17 lbs isn't a portability comparison, it's two different objects. The Pro 3 is an appliance: you carry it once, with a second person, to the place where it will live, and after that it's furniture near the breaker panel. The C300 DC is luggage. It goes in a bag and you forget about it until the phone reads 10%.
That asymmetry is why the travel rows collapse. The unit with the energy doesn't move, and the unit that moves has nowhere to plug a lamp. If your power problem happens at a campsite with AC gear in the bin, the answer is a mid-size station with a real inverter and a carry handle, and neither of these is that.
Lifetime Value
Selected because: Because the expensive unit is the cheap one per unit of energy delivered: about 16,384 kWh over 4,000 rated cycles against 864 kWh over 3,000.
cost / lifetime kWh
Per kilowatt-hour, the flagship is the bargain on this page, which tends to surprise people who have just read the two price tags. The arithmetic is dull and decisive: 4,000 rated cycles across a 4,096Wh pack is about 16,384 kWh of lifetime energy, against 864 kWh from 3,000 cycles on 288Wh.
Eleven years of daily cycling against 8.2 is the part to keep, because it says neither of these is likely to be what wears out first. What decides your money is whether you use what you bought. A Pro 3 charging phones one afternoon a week is a beautifully built paperweight, and a C300 DC asked to hold a fridge isn't a purchase at all. Match the load first, then let cost per kWh confirm the choice rather than make it.
Strengths & trade-offs
EcoFlow DELTA Pro 3
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 (+$2,599) than the SOLIX C300 DC.
- –Significantly heavier (+107.3 lbs), making it harder to move.
- –Very heavy unit that may be difficult for one person to lift.
Anker SOLIX C300 DC
Strengths
- +Costs $2,599 less
- +Lighter by 107.3 lb
Trade-offs
- –Weaker inverter (-3,700W) limits appliance compatibility.
- –Sealed capacity — the DELTA Pro 3 can add batteries to grow past 288Wh; this one can't.
- –Shorter-lived battery — rated for 3,000 charge cycles vs the DELTA Pro 3'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
Neither unit
Neither gives you a powered weekend: the DELTA Pro 3 has the energy but doesn't travel, and 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. One can't go; the other can't finish.
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 Pro 3
The fridge, the router and the modem come to 1,645Wh, and the DELTA Pro 3 ends the night with 1,837Wh still in the pack. The SOLIX C300 DC isn't losing this row on capacity: it has no AC outlets, so the appliances on the list never connect to it. A blackout is answered by an inverter first and a battery second.
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 Pro 3
320Wh of CPAP is the one overnight job a DC box is shaped for, and it's where the SOLIX C300 DC runs out rather than locks out. Its 245Wh usable covers about three-quarters of the night and leaves it 75Wh short, with no expansion available to close the gap. The DELTA Pro 3 takes the same night at 9% used and can hold the router through the outage as well.
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 Pro 3
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. The DELTA Pro 3 handles this scenario with 2,572Wh to spare.
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 gives you a powered game day: the DELTA Pro 3 has the energy but doesn't travel, and the SOLIX C300 DC has no AC outlets, so the blender and led tv in this scenario never plug in — it's a DC station for USB and 12V gear, and no wattage figure changes that. One can't go; the other can't finish.
Battery budget usedlower = more headroom
LOAD Blender 400W×0.5h · LED TV (55") 80W×4h · Bluetooth Speaker 15W×4h · Phone Charger (×3) 45W×2h
SCN-06 · 24 hours · needs 4,685Wh
Van Life Daily
A full day of mobile living — the ultimate endurance test
Neither unit
4,685Wh a day beats both of these, and neither gets a pass on it. The SOLIX C300 DC has no AC outlets for the fridge or the lights, and the DELTA Pro 3 comes up 1,203Wh short of the day even with 3,482Wh usable. Full-time van power means expansion batteries on top of the Pro 3, or a bigger system than either box on its own.
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, 100Wh across an afternoon, and both units cover it. The SOLIX C300 DC finishes at 41% used with 145Wh in hand, and the DELTA Pro 3 doesn't notice the load. This is the one row where 4,096Wh is cargo rather than headroom: take the 6.17 lb box and leave the other one 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 Pro 3 can run this load — the SOLIX C300 DC has no AC outlets for the wall-plug gear in it.
$2,799 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 0–232.1hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–46.4hHigh-Draw Appliances
These reveal the real limitsscale 0–3.5h¹ 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 Pro 3, on Power Score margin
If one item on your list ends in a wall plug, the DELTA Pro 3 is the only one of these two in the running, and capacity has nothing to do with why. Our record shows the SOLIX C300 DC with zero AC outlets because it ships without an inverterB0B1; its 300W figure is a DC port total across USB and 12V. The Pro 3 answers the ordinary version of this question with five AC outlets, two 240V sockets, a 30A RV socket and 4,096Wh, and it walks the eight-hour blackout profile's 1,645Wh of fridge, router and modem with 1,837Wh still in the pack. The confidence sits at six rather than nine because a real share of readers should buy the other box and stop reading: if your kit is a phone, a laptop and camera batteries, the C300 DC does that job at $200 and 6.17 lbs, with four USB-C ports whose top two are rated 140W against the flagship's two at 100W. The Pro 3 earns $2,599 more when your loads have plugs, and not before.
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.
$2,799.00 · direct from EcoFlow
Last checked 16 days ago. Prices move — check before you buy.
Written by Gunner Gustafson, Whole-Home Backup Tester · Station Arena Test Desk · Updated September 19, 2026
Black Friday · 38 days out
Price to beat:DELTA Pro 3 $2,399
The lowest we have recorded. A Black Friday price above it is a sale this unit has already had.
Measured Data
Benchmark scores and the full spec record, side by side.
Benchmark scores
Not rated for both units (minimum threshold unmet): RV Living, Home Backup, Solar Generator, 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 Pro 3 rates 3.9/5 (37th percentile of 20 Home Backup-class units), and SOLIX C300 DC rates 4.4/5 (65th percentile of 24 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.
112.4 lbs, and It Stays Where You Put It
Two people, bent knees, once. The DELTA Pro 3 is a unit you site rather than one you pack, and that single fact is why three of the seven scenario rows here read neither: the box with the energy doesn't travel. If your power problem happens away from the house, this is the honest strike against it, and 4,096Wh doesn't talk you out of it.
No AC Outlets: Read This Card First
The SOLIX C300 DC's 300W is a DC port total across USB and 12V, not an inverter rating. Nothing with a wall plug connects to it, whatever the wattage says. That's the design rather than a defect, and the same decision bought something real: 6.17 lbs, and four USB-C ports whose top two are rated 140W against the DELTA Pro 3's two at 100W. On the DC bench the small box wins. On the AC side it isn't losing, it isn't playing. Sort your gear by connector before you weigh anything else on this page.
288Wh Is the Ceiling, Not a Shortcoming
The SOLIX C300 DC is sealed at 288Wh, which is the complete form of what it is rather than a missing feature, so size it up front. It bites in exactly one place: the overnight CPAP row, where it lands 75Wh short of the 320Wh that night takes and there's nothing to bolt on. The DELTA Pro 3 does take expansion batteries, though the first thing it holds over the C300 DC is the 4,096Wh already inside it.
Only the DELTA Pro 3 Lists a UPS Mode
The DELTA Pro 3 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 Pro 3 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 1.8), 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 Pro 3 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 4,096Wh on the DELTA Pro 3 and 288Wh on the SOLIX C300 DC, so count lifetime energy — roughly 16,384 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 Pro 3 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 Pro 3'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 Pro 3.
Check DELTA Pro 3 price →or check the SOLIX C300 DC priceOwnership Analysis
What happens after you buy — true cost of ownership, brand trust, and growth potential.
Lifetime value
Service lifeyears at one full cycle per day
Lifetime energy delivered
Cost per delivered kWh
│ warranty ends · Reaching the cycle rating means ~80% capacity remains — degraded, not dead.
Analyst note
The SOLIX C300 DC is cheaper to buy, but the DELTA Pro 3 is cheaper to own. At $0.17/kWh over its lifetime vs $0.23/kWh, the DELTA Pro 3's higher cycle life and capacity make each dollar go further over the years.
Brand trust
EcoFlow
Ecosystem
Largest in portable power — 12-15 models across DELTA Pro, DELTA 3, and RIVER 3 series, plus solar panels and smart home panels
Support
US-based phone/email/chat support (1-800-368-8604). Experiences are polarized — many report hassle-free prepaid-label replacements, but others report long waits and refurbished units sent for new claims. Pro tip: buying from Costco or Amazon gives you a stronger return safety net.
Community
Largest community in the space — Reddit r/Ecoflow_community (~31K members), multiple Facebook groups, and an official community forum
App experience
Rated 4.6/5 iOS (~8,400 ratings) · 4.2/5 Android (~17,000 ratings)
Unique strength
Fastest-charging technology (X-Stream), deepest product ecosystem, and most active innovation cadence. 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
EcoFlow's ecosystem is the deepest in portable power, and its support experiences are genuinely split: smooth prepaid-label replacements on one side, long waits and refurbished units sent against new claims on the other. Buying through a retailer with its own returns policy is cheap insurance on a unit this heavy, because you are not casually shipping it anywhere. Worth knowing too that EcoFlow offers no parts or service once the warranty is done.
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
Anker's consumer-electronics reputation is why a lot of people reach for a SOLIX, but SOLIX-specific support reports are trending down from that standard, and firmware updates have removed features without notice. On a light DC box at this price that's an annoyance you can absorb. It would read very differently on a flagship you can't lift alone.
Analyst note
Brand weight lands unevenly across a fork this wide. One of these is a heavy appliance you'll cycle for years and would have to crate up if it failed, so support quality and out-of-warranty options are part of what you're buying. The other is a light box you could replace out of pocket without a support ticket. Judge the support records where they actually cost you something, on the unit you can't put in a padded envelope.
Growth path
DELTA Pro 3
EXPANDABLESupports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 4,096Wh.
Accepts up to 2,600W of solar. Enough for a serious multi-panel array.
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 Pro 3 starts at 4,096Wh 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 Pro 3
Field material on the DELTA Pro 3 leans on review desks and retailer reviews rather than long-term owners, which is worth knowing before you weigh any of itA0. What's there is consistent: reviewers treat it as a whole-home backup benchmark and confirm the 4,096Wh LFP pack, 4,000W output and dual-voltage 120V/240V behaviourA1A4, with the cells rated 4,000+ cycles to 80% and an IP65 rating on the batteryA2.
The recharge figures are the ones that matter when the grid is down. Reviewers report 0 to 80% in about 50 minutes on up to 7,000W of input, a full charge in roughly 90 minutes, and up to 2,600W of solarA3. A good solar day refills this thing, which is the difference between owning a battery and having a plan.
“4,096Wh LFP battery with 4,000W continuous AC output (6,000W with X-Boost) and dual-voltage 120V/240V, expandable to 48kWh.”
Sources
ecoflow.com · amazon.com · homedepot.com · thepowerpick.com · outboundpower.com · techradar.com · thesolarlab.com
Anker SOLIX C300 DC
Reviewers are clear about what the C300 DC is: a 288Wh unit that drops the AC inverter to stay near 6 lbs, built for travellers charging devices rather than anyone running appliancesB1B4. The ports are its case, 2 USB-A, 4 USB-C and a 12V car socket, with two-way USB-C over PD 3.1 refilling the unit to about 80% in an hourB2. Owners praise the portability and say the capacity covers several phone and laptop refills or a small light setupB3.
Two cautions about that evidence, both of which matter more than usual here. Retailer reviews pool the C300 DC in with the C300X, so some of what you read may describe a siblingB3. And the naming is a trap: the AC-equipped SOLIX C300 is a different unit, so a glowing review of one tells you nothing reliable about the otherB0.
“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
- Huge 4,096Wh LFP capacity, 4,000W dual-voltage output, very fast charging, and big expandability are the standout praise; it's heavy at ~113 lbs. [DELTA Pro 3 · 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
“4,096Wh LFP battery with 4,000W continuous AC output (6,000W with X-Boost) and dual-voltage 120V/240V, expandable to 48kWh.”
ecoflow.com / amazon.com — DELTA Pro 3 · 2026 · [positive]
- A2
“LiFePO4 rated for 4,000+ cycles to 80% (10+ years), with an IP65 battery rating.”
homedepot.com / thepowerpick.com — DELTA Pro 3 review · 2026 · [positive]
- A3
“Multi-charge technology reaches 0-80% in about 50 minutes using up to 7,000W input, with a full charge in roughly 90 minutes; up to 2,600W solar.”
outboundpower.com / techradar.com — DELTA Pro 3 review · 2026 · [positive]
- A4
“Weighs about 113.5 lbs; reviewers call it a gold-standard whole-home backup unit for 2026.”
techradar.com / thesolarlab.com — DELTA Pro 3 review · 2026 · [positive]
- B1
“A 288Wh unit that ditches the heavy AC inverter to focus on DC power, keeping it very light at about 6.2 lbs.”
the-gadgeteer.com / forbes.com — SOLIX C300 DC review · 2026 · [positive]
- B2
“Offers 2 USB-A and 4 USB-C ports plus a 12V car socket; two-way USB-C with PD 3.1 recharges the unit to 80% in about 1 hour.”
androidpolice.com / batteryessence.com — SOLIX C300 DC review · 2026 · [positive]
- B3
“Owners praise its portability and capacity — enough to charge a phone and laptop several times, run a fan for hours, or power a small light setup.”
bestbuy.com owner reviews — SOLIX C300 DC / C300X · 2026 · [positive]
- B4
“A DC-focused design with app integration and solar support — best for modern travelers charging devices, not running AC appliances.”
androidpolice.com / campingsolar.us — SOLIX C300 DC review · 2026 · [mixed]
Research compiled September 19, 2026.
What Owners Actually Report
Drawn from 58 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 Pro 3
74 claims from 50 comments · 50 from owners · 22 with figures
- Charging
- 8 · 30% negative
- Runtime
- 7 · 0% negative
- Price & value
- 11 · 3% negative
- Expandability
- 7 · 97% negative
- Warranty & support
- 8 · 69% negative
What owners complain about
His DP3 can only charge from an external 120V source while outputting 240V.
Chargingowner7 agreedsource →
At almost 120 lb he would not call the DP3 portable.
Size & weightmeasuredowner3 agreedsource →
Regrets buying the DP3 over the F3800 because it lacks 240V passthrough.
Expandabilityowner4 agreedsource →
What owners praise
Recharges in about 70 minutes at 3400W from a 240V generator inlet.
Chargingmeasuredowner57 agreedsource →
Ran lights, fans, modem, fridge and a 1300W air conditioner through a 5-day hurricane outage.
Runtimemeasuredowner30 agreedsource →
Costco sells a DELTA Pro 3 twin pack at $4,999, dropping to $4,499 on sale.
Price & valuemeasuredowner6 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 Pro 3 if you…
- →Your outage list starts with the fridge. That eight-hour night of fridge, router and modem runs 1,645Wh and leaves 1,837Wh in the pack, so it isn't close.
- →You have 240V or RV gear waiting: two 240V sockets and a 30A RV socket are on the Pro 3 and on nothing else here.
- →You want the desktop and the router to ride through a flicker without rebooting. It lists a UPS mode rated no worse than 10ms; the C300 DC lists none.
- →You're building toward partial-home backup and may add expansion batteries later, on top of the 4,096Wh you already own.
- →You'll cycle it hard for years: 4,000 rated cycles is about eleven years at one cycle a day.
Buy the SOLIX C300 DC if you…
- →Everything you own charges over USB-C. Four C ports with the top two at 140W is a better bench than the flagship's two at 100W.
- →You carry your power: 6.17 lbs in a daypack, through an airport, onto a folding table in the woods.
- →Phones, a laptop, camera batteries and a speaker across an afternoon. That 100Wh job leaves 145Wh still in the pack.
- →You want one cable for the whole kit, since the same USB-C charger that feeds your laptop refills the unitB2.
If neither fits
Anyone who wants AC power away from the house should close this tab, because that person is the one this page can't serve. The campsite, tailgate and van rows all read neither for the same two reasons: the unit with the energy weighs 112.4 lbs and stays where you set it, and the unit you can carry has no AC socket for the lights, the fan or the blender. What you want is the middle of this market, which neither of these occupies: a mid-size station with a real inverter and a handle you can lift alone. Two more people should skip both. The full-time van dweller drawing 4,685Wh a day, because even the Pro 3 is 1,203Wh short of that and needs either expansion batteries or an alternator-and-panels build behind it. And the CPAP buyer hoping for a light DC box that lasts the night: the C300 DC is 75Wh short of the 320Wh that night takes, and there is nothing to add to it.
The Bottom Line
Take the DELTA Pro 3 if a single item on your list ends in a wall plug, and be clear that you're buying it for the inverter and the sockets rather than for the battery. Five AC outlets, two 240V sockets, a 30A RV socket, and a fridge-and-router night that finishes with 1,837Wh unused. The capacity makes that comfortable. The outlets are what make it possible at all.
If nothing you own has a plug, buy the other one and don't feel bad about it. The C300 DC is 6.17 lbs of well-liked DC box with a better USB-C bench than the flagshipB2B3, and the reader who buys it for a bag of cables gets exactly what they paid for. The only expensive mistake on this page is picking the wrong side of a fork that was never about watt-hours.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Can the Anker SOLIX C300 DC run a fridge, a TV or a coffee maker?
No, and not because of its size. Our record carries zero AC outlets on it, because there's no inverter inside, so anything ending in a wall plug has nothing to plug into. Its 300W rating is a DC port total across USB and 12V. The DELTA Pro 3 is the unit here with five AC outlets, two 240V sockets and a 30A RV socket.
Is the SOLIX C300 DC the same thing as the SOLIX C300?
No, and this is the easiest way to get burned on this purchase. The C300 DC drops the AC inverter to stay light, while the plain C300 is the AC-equipped model. Retailer reviews also mix the C300 DC in with the C300X, so check which model a review is actually about before you trust what it says about outlets.
Is the DELTA Pro 3 worth $2,599 more?
If your loads have plugs, that isn't the real comparison, because the C300 DC can't do the job at any price. What the money buys is 4,096Wh behind five AC outlets, two 240V sockets, a 30A RV socket and a UPS mode rated no worse than 10ms, plus five years of warranty against three. If nothing you own has a plug, then no, and the $200 box is the better buy of the two.
Which one is better for charging a laptop and camera gear?
The C300 DC, clearly. It has four USB-C ports with the top two rated 140W against the Pro 3's two at 100W, it weighs 6.17 lbs, and the same USB-C cable that charges your laptop refills the unit itself to about 80% in an hour according to reviewers. The Pro 3 would do that job while weighing 112.4 lbs and still losing on the port.
Do people end up buying both?
It's a reasonable outcome, because these two never overlap. The Pro 3 is a fixture that lives near the panel and holds the fridge and the router; the C300 DC lives in a bag with your cables. If you're buying one, buy on the connector: the fork on this page has nothing to do with watt-hours.
Where to buy
EcoFlow DELTA Pro 3Pick
$2,799.00
$2,799.00 · direct from EcoFlow
Last checked 16 days ago. Prices move — check before you buy.
Anker SOLIX C300 DC
Sold on Amazon · today’s price is on the listing
Prices may vary by retailer and are subject to change.