Head-to-head test
EcoFlow DELTA Pro Ultra X vs Anker SOLIX C1000 Gen 2
One of these is 24.9 lbs and rides in the trunk, the other is a 298.7 lb installed system, and the only question this page can settle is which of those two purchases you're actually making.
Full profiles: EcoFlow DELTA Pro Ultra X → · Anker SOLIX C1000 Gen 2 →
Written by Gunner GustafsonUpdated
Whole-Home Backup Tester, Station Arena Test Desk
$7,999.00 · direct from EcoFlow
Last checked 1 day ago. Prices move — check before you buy.
$529.99 · direct from Anker
Last checked 1 day ago. Prices move — check before you buy.
Spec deltas
$7,999 against $530. That is $7,469 of daylight for 12 times the storage (12,288Wh against 1,024Wh), which reads like a bad trade right up until you notice that nobody buys the DELTA Pro Ultra X for storage. They buy it for a 12,000W inverter that feeds household circuits at 120/240VA1, and the SOLIX C1000 Gen 2 has no version of that at any price.
Almost nobody cross-shops these two on purpose. You land here because a search for backup power returned both, or because you already own a C1000 and you're curious what going big looks like, or because you're pricing the DELTA for a house and wondering whether you also need something you can carry. That last reader has the right instinct and the wrong page. These two are complements, not rivals.
Take the C1000 unless you can name the circuit. Its honest limit is 870Wh usable after inverter derating, 85% of the 1,024Wh nameplate, which covers a 320Wh CPAP night nearly three times over and comes up 40Wh short of a 910Wh unplugged workday. That's a one-room, one-day machine. If your real need is bigger than that and smaller than a house, neither box on this page is your answer.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
Capacity
Bring in the inverter and it resolves. Twelve C1000s give you 24,000W of inverter (12 x 2,000W), more raw wattage than the DELTA's 12,000W, but split across twelve islands with twelve cords and no way to put 240V between them. The $1,399 premium buys one inverter that ties all 12,288Wh into a single supply a breaker panel can acceptA1. You are paying for consolidation, not cells.
DELTA Pro Ultra X: 12,288Wh for $7,999SOLIX C1000 Gen 2: 1,024Wh for $53012,288 divided by 1,024 is exactly 12
Why it mattersIf you can't name a load that needs the whole bank behind one plug, consolidation is the part of this price you won't use.
rated cycles
And the six cents fall the cheap unit's way partly on cycles, since the C1000 is rated for 500 more of them than the system costing fourteen times as much. So the premium isn't buying better cells or better economics. Anyone justifying the DELTA on dollars-per-watt-hour has the argument backwards, and anyone rejecting it on that metric is rejecting it for the wrong reason.
$7,999 over 12,288Wh x 3,500 cycles = 43,008 lifetime kWh$530 over 1,024Wh x 4,000 cycles = 4,096 lifetime kWhCycle life: 3,500 for the DELTA, 4,000 for the C1000
Why it mattersTake value-per-watt-hour off the table. Both units pass it. Decide on the inverter and the installation.
solar input
That ceiling describes a building, not a battery. 10,000W of panel is a roof, wired by somebody, feeding an installation that reviewers put at about a week from delivery to runningA4. 600W is two portable panels leaned against a picnic table. Neither number is better than the other. They are specs for different addresses, and only one of them is available to a renter.
DELTA Pro Ultra X: 10,000W solar input against 12,288WhSOLIX C1000 Gen 2: 600W solar input against 1,024WhDELTA Pro Ultra X: 298.7 lbs
Why it mattersIf you don't control a roof, the DELTA's headline solar figure is not a number you can spend.
It is also the one that runs out. 910Wh needed against 870Wh usable is a 40Wh miss, about 4% of the day's load, on the only unit of the two that would ever be in the room with you. The DELTA's 10,445Wh usable solves a problem it cannot physically attend.
SOLIX C1000 Gen 2: 140W USB-C, 24.9 lbsDELTA Pro Ultra X: 100W USB-CRemote Workday needs 910Wh; the C1000 has 870Wh usable
Why it mattersDesk-and-laptop buyers should take the C1000 and plan on a wall top-up, or move up a size class rather than up a category.
The specific dimensions that decide these two units — everything else is a tie.
Portability & Form Factor
Selected because: 24.9 lbs against 298.7 lbs isn't a portability difference, it's the difference between a product you carry and a product you install.
weight
24.9 lbs is a one-hand carry to the car. 298.7 lbs is a delivery, a placement decision and a set of cables, and that figure is the system total across battery modules and inverter rather than one object you pick up. The distinction matters because calling something heavy implies you'd move it occasionally. You won't move this one at all.
That single fact reorganizes the rest of the page. Four of the six scenarios here are scored as though both units show up: camping, the tailgate, the remote workday, van life. Only one of them does. Read the DELTA's wins in those rows as statements about capacity, not about where it will be on Saturday.
Your Life, Your Pick
Selected because: The DELTA Pro Ultra X wins all six scenarios, and exactly one of those wins describes something it would really be doing.
The DELTA takes all six rows, and the way it takes them is the story. The heaviest load on the list is a 4,685Wh van-life day, and that comes to 45% of its 10,445Wh usable. The scenario set doesn't contain a load big enough to make it sweat. The C1000 clears two rows outright, the 320Wh CPAP night at 37% of its 870Wh usable and the tailgate at 77%.
The row worth staring at is the remote workday. 910Wh needed, 870Wh usable, a 40Wh gap. That's a coin landing on edge, and one wall outlet at lunch settles it. The 8-hour blackout is the honest failure: the list wants 1,645Wh, which averages roughly 206W across the evening, so 870Wh usable buys about four of those eight hours. Four hours of lights, router and CPAP is a real product. It just isn't eight.
Lifetime Value
Selected because: The 14.5-to-1 price gap between $7,999 and $530 shrinks to six cents per lifetime kilowatt-hour, nineteen against thirteen.
cost / lifetime kWh
Thirteen cents against nineteen, per kilowatt-hour delivered over each unit's rated life. That's the entire value comparison between a box you carry and a system you install, and a six-cent spread means the expensive one isn't overpriced per unit of energy. It's priced for something other than energy.
The C1000 earns its edge on cycles rather than price: 4,000 against 3,500, so the cheaper unit is also the longer-lived one per charge. Neither fact should decide this purchase. If you're weighing dollars-per-watt-hour here, you've found a metric both units pass and let it stand in for the question you're actually stuck on.
Growth Path
Selected because: Both units expand, so the live question is whether you start at 1,024Wh and grow or commit to 12,288Wh up front.
solar input
Both expand, and only one of those paths goes somewhere you'd notice. Adding Anker batteries to a 1,024Wh base grows storage behind the same 2,000W inverter and the same 600W solar ceiling, so you get more hours of exactly what you already had. Adding EcoFlow batteries grows storage behind 12,000W and a 10,000W solar ceiling, which is the only version of expansion that also raises what you can run and how fast you can refill it.
One caution, and it cuts against the bigger unit. Don't buy the DELTA for its ceiling. Our sources give three different maximum expansion figures and the spec record says only that it expands, so treat anything above the 12,288Wh you're paying for as a conversation with an installer rather than a number you can hold anyone to. Buy the base for what the base does.
What the Specs Don't Tell You
Selected because: One of the three cards below fires on a warranty difference that doesn't exist: both units carry 5 years.
rated cycles
The warranty card is the one to distrust. Both units carry five years, identical terms, and 'more coverage per dollar' is the price ratio wearing a hat. There is something real buried in it: five years spread across $7,999 is $1,600 a year of coverage against $110 for the C1000, so the two leave you exposed very differently in year six. That's a statement about money at risk, not about which company stands behind its product harder.
The surge card is real but easy to over-read. 45,000W against 3,000W is a genuine fifteenfold gap, and it's what lets the DELTA absorb several motors starting at once on circuits you don't control. For one fridge on one cord, the C1000's ceiling isn't the constraint. The 870Wh behind it is. And the weight card is measuring a system total across modules, so the cost there isn't the lift, it's committing to a permanent address.
Strengths & trade-offs
EcoFlow DELTA Pro Ultra X
Strengths
- +Larger battery capacity
- +Higher AC output
- +Faster solar charging
Trade-offs
- –Substantially more expensive (+$7,469) than the SOLIX C1000 Gen 2.
- –Significantly heavier (+273.8 lbs), making it harder to move.
- –Very heavy unit that may be difficult for one person to lift.
Anker SOLIX C1000 Gen 2
Strengths
- +Costs $7,469 less
- +Lighter by 273.8 lb
Trade-offs
- –Weaker inverter (-10,000W) limits appliance compatibility.
Will It Power Your Gear?
Scenario math and per-appliance runtimes, modeled from the spec record.
Scenario verdicts
We ran the math on six 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
On the numbers this is the DELTA's row, at 20% of its 10,445Wh usable against a C1000 that needs 2,100Wh and holds 870. In the world, only one of these is going camping. What the row is really telling you is that two nights with a fridge is a 2,100Wh job and 870Wh usable isn't it, which is an argument for a bigger portable rather than for a house battery in the back seat.
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 Ultra X
This is the DELTA's actual job and it barely notices, 1,645Wh out of 10,445 usable, 16% used. The C1000 covers about four of the eight hours, since that list averages roughly 206W across the evening and it holds 870Wh usable. That's not nothing. It's lights, phones, the router and the CPAP, and it's the difference between an uncomfortable night and a dark one.
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 Ultra X
Both cover it and the percentages are theatre: 320Wh is 3% of the DELTA's usable and 37% of the C1000's. The DELTA takes the row on headroom, which is the least useful thing you can win a CPAP night with. The spec that decides a bedroom is whether the box can be in the bedroom, and only one of these two is choosing between the nightstand and the floor.
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 Ultra X
The C1000 misses by 40 watt-hours, 910 needed against 870 usable, which is about 4% of the day. A wall outlet at any point erases it entirely, so this row is really telling you the scenario assumes a full day off-grid. The DELTA takes it at 9% used, which is what 10,445Wh of usable capacity does to a laptop and a monitor.
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
SOLIX C1000 Gen 2
Both cover game day, 6% used against 77%, and then the parking lot decides it. The C1000 is 24.9 lbs, so it walks in with the cooler. The DELTA is an installed system that isn't leaving the house, so the headroom it wins this row with is headroom you'd have to leave at home.
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
DELTA Pro Ultra X
4,685Wh a day is the only load here big enough to mean anything, and it still uses only 45% of the DELTA's usable. The C1000 covers about 19% of that day, 870Wh usable against 4,685, so it's a fifth of a van rather than a van. In a Sprinter neither of these is the answer. In a skoolie with real floor space and a mounting plan, the DELTA genuinely is.
Battery budget usedlower = more headroom
LOAD Mini-Fridge 150W×24h · Laptop 60W×4h · Phone Charger 15W×3h · LED Lights 40W×5h · Fan 75W×8h
The Load Test
RUNTIME = (Wh × 0.85) ÷ LOAD
None of the scenarios above exactly yours? Build it. Toggle what you'd plug in; both units are tested against the combined draw.
Essentials
Comfort & Convenience
High-Draw Appliances
Test duration
8h
Continuous draw
205W
Projected runtime
For this load: DELTA Pro Ultra X runs 51h vs 4.2h.
$7,999 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 0–696.3hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–139.3hHigh-Draw Appliances
These reveal the real limitsscale 0–10.4h¹ 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 Anker SOLIX C1000 Gen 2
Take the SOLIX C1000 Gen 2 unless you can point at a 240V circuit you intend to back up. The DELTA Pro Ultra X wins all six scenarios below, but it wins them the way a house wins against a suitcase, and five of those six wins assume it is somewhere it will never be. What the extra money buys is real and specific: 12,000W continuous at 120/240V with 45,000W of surge behind itA1, against 2,000W and 3,000W. If that capability isn't already on your list, you're paying $7,469 more for storage that costs nineteen cents a lifetime kilowatt-hour against thirteen. Confidence is moderate rather than high because the C1000's 870Wh usable genuinely runs dry on a two-night camp, on a full 8-hour outage, and on a van-life day. If any of those is your actual week, buy neither of these and shop the mid-size portable class that sits between them.
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.
$529.99 · direct from Anker
Last checked 1 day ago. Prices move — check before you buy.
or check the DELTA Pro Ultra X price$7,999.00 list
Written by Gunner Gustafson, Whole-Home Backup 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, CPAP, Solar Generator, Tailgating, 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 Ultra X rates 4.3/5 (61st percentile of 29 Whole-Home / Off-Grid-class units), and SOLIX C1000 Gen 2 rates 4.9/5 (96th percentile of 27 Everyday-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.
298.7 lbs, and Not All in One Box
The 12,288Wh base is built from two 6,144Wh battery modules plus the inverter, so 298.7 lbs is a system total rather than a single lift. That's better news for getting it through a doorway and worse news for everything after: several chassis to place, cable and commission, and no casual relocating once it's done. Budget for where this lives before you budget for what it does.
Surge Headroom Is Real. Aim It at the Right Question.
45,000W against 3,000W is a fifteenfold gap, and the ratios agree, 3.8x surge-to-continuous for the DELTA against 1.5x for the C1000. What that buys is absorbing several motors starting at once on circuits you don't control, the well pump kicking in while the AC compressor does. For one fridge or one power tool on one cord, the C1000's 3,000W ceiling is not the thing that will stop you. Its 870Wh of usable energy is.
Same Five Years, Different Denominator
Both units carry a 5-year warranty on identical terms. The card is dividing those same five years by two very different prices, so 14.5x more coverage per dollar is just the price gap restated. The real point inside it: five years across $7,999 works out to $1,600 a year of coverage against $110 for the C1000, so a failure in year six costs you very differently. Don't read it as one brand standing behind its product harder than the other.
Full record above — the Test Desk pick is the SOLIX C1000 Gen 2.
Check SOLIX C1000 Gen 2 price →or check the DELTA Pro Ultra X 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 C1000 Gen 2 wins on both sticker price and long-term value. At $0.13/kWh over its lifetime, it's meaningfully cheaper to own. Clear value winner. One caution on the lifespan row: the SOLIX C1000 Gen 2 takes longer to reach its cycle rating, but a cycle moves a different amount of energy on each unit — the DELTA Pro Ultra X still delivers more over its shorter horizon (43,008 vs 4,096 kWh). Years measure wear, not usefulness.
Brand trust
EcoFlow
Ecosystem
Largest in portable power — 12-15 models across DELTA Pro, DELTA 3, and RIVER 3 series, plus solar panels and smart home panels
Support
US phone, email and chat, and the experience is polarized. Some claims close with a prepaid label and no argument; others turn into long waits and a refurbished unit against a new claim. Buying through Costco or Amazon gives you a second return path EcoFlow can't take away, which matters more the larger the purchase.
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
The deepest catalogue in the category, 12 to 15 models plus panels and smart home panels, with X-Stream charging across it. If you're planning a system rather than buying a box, that breadth is the point of choosing EcoFlow at all.
Worth knowing
No parts or service offered out of warranty, which reads heavier on an installed system than on something you can box up and replace. There's also an October 2025 recall on the DELTA Max 2000 for overheating, a different product line, but it belongs in the file.
Anker
Ecosystem
7-8 SOLIX portable power stations across C-series (compact) and F-series (flagship), plus the X1 home energy system
Support
Anker built its name on no-hassle replacements, and SOLIX-specific support quality is trending the other way, with AI-first agents returning generic answers and hazmat shipping turning returns on heavy units into a chore. At 24.9 lbs the C1000 sits on the easier side of that logistics problem.
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 business, InfiniPower cell life, and some of the better dollars-per-watt-hour in the mid-size catalogue, the C1000 included.
Worth knowing
Firmware updates have removed features without notice, and the expansion ecosystem is smaller than EcoFlow's. Both matter more if 'start small and grow' is the plan you're buying into.
Analyst note
EcoFlow is the deeper system company and Anker is the more trusted box company, and this matchup is that difference with prices attached. One asks you to buy into an ecosystem and pick an install date. The other asks you to buy a thing and put it in a closet.
Growth path
DELTA Pro Ultra X
EXPANDABLESupports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 12,288Wh.
Accepts up to 10,000W 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 C1000 Gen 2
EXPANDABLESupports Anker 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 600W of solar. Suitable for a 1-2 panel setup.
Generous port selection supports complex multi-device setups.
Expansion batteries are Anker-specific. You're investing in the Anker ecosystem.
Realistic full solar rechargeat 70% of rated panel output — see methodology
Analyst note
Both expand, but the DELTA Pro Ultra X's higher solar ceiling (10,000W vs 600W) gives it the stronger off-grid growth path — more panels can feed a bigger bank as it grows.
What Owners Report
Patterns from published owner reports and long-term reviews — every claim cited to its source below.
EcoFlow DELTA Pro Ultra X
There is no long-term owner record for this one yet. What exists is launch and review coverage: 12kW continuous at 120/240V scaling with surge handling to 45kWA1, EV-grade LFP cells under 24/7 BMS oversight with solar charging to 10kWA3, and a quick-connect design that reviewers put at roughly a week from delivery to runningA4. That last item is the only field-shaped detail in the set, and it comes from launch coverage rather than from a homeowner's Saturday.
Treat the expansion ceiling as unsettled. The sources we hold quote more than one maximum, and none of those figures appears in the spec record, which says only that the unit expandsA2. That is a reason to buy it for the capacity in the box, not for a headline about what it might grow into.
“Base config delivers 12kW continuous at 120/240V — enough to power every circuit including a 5-ton AC — scaling to 12-36kW with surge handling to 45kW via Adaptive Start.”
Sources
ecoflow.com · outboundpower.com · bobvila.com · thesolarlab.com
Anker SOLIX C1000 Gen 2
Recharge speed is the C1000 Gen 2's headline in the coverage: reviewers clock a full refill at roughly 49 minutes against the original's 58 to 80B1. The catch travels with it. Fan noise is the single most common complaint, quiet below about 200W but climbing to around 55 dB while fast-charging or pushing past 1,000WB2. Those are the same fact told twice. The 49 minutes is bought with airflow, so if this lives in a bedroom, charge it in the afternoon.
The output bump is the other thing reviewers keep flagging, with enough continuous headroom to run a 1,500W space heater and still have roomB3, which is most of why the roundups call it the mid-size unit to beat this yearB4. Note what that praise is scoped to. Mid-size. Nobody in the coverage is claiming it does a house.
“Fast HyperFlash charging — a full recharge in roughly 49 minutes, noticeably quicker than the original C1000's ~58-80 minutes.”
Sources
thepowerpick.com · macrumors.com · outdoorgearlab.com · technerdo.com · mensjournal.com · powerstationadvisor.com
Sources & Research Notes
Every owner claim in this report is traceable to a published source. The bracketed references above resolve here.
Recurring owner themes
- Whole-home 12kW output, massive scalability (to 184kWh), EV-grade LFP, 10kW solar, and fast install are the standout features. [DELTA Pro Ultra X · 3 entries]
- Fast charging and higher output over the original are the standout gains; fan noise under load or fast charging is the top complaint. [SOLIX C1000 Gen 2 · 3 entries]
- A1
“Base config delivers 12kW continuous at 120/240V — enough to power every circuit including a 5-ton AC — scaling to 12-36kW with surge handling to 45kW via Adaptive Start.”
ecoflow.com / outboundpower.com — DELTA Pro Ultra X review · 2026 · [positive]
- A2
“Base 12.288kWh of LFP storage (6,144Wh x 2), expandable to 61.44kWh with one inverter and up to 184.32kWh with three inverters and thirty batteries.”
ecoflow.com / outboundpower.com — DELTA Pro Ultra X · 2026 · [positive]
- A3
“EV-grade full-tab LFP cells with a multi-layer safety architecture and 24/7 BMS oversight; solar charging up to 10kW.”
ecoflow.com / bobvila.com — DELTA Pro Ultra X review · 2026 · [positive]
- A4
“A quick-connect design cuts installation time and cost by up to 80%, ready in about 7 days; a CES 2026 Innovation Award Honoree at a $7,999 base price.”
ecoflow.com / thesolarlab.com — DELTA Pro Ultra X review · 2026 · [positive]
- B1
“Fast HyperFlash charging — a full recharge in roughly 49 minutes, noticeably quicker than the original C1000's ~58-80 minutes.”
thepowerpick.com / macrumors.com — Anker SOLIX C1000 Gen 2 review · 2026 · [positive]
- B2
“Fan noise is the single most common complaint — nearly silent at low load (about 35 dB under 200W), but the fans ramp up audibly during fast charging or heavy output, reaching around 55 dB at 1,000W-plus.”
outdoorgearlab.com / technerdo.com — C1000 Gen 2 review · 2026 · [negative]
- B3
“The higher continuous output crosses a useful threshold over the original — enough to run a standard 1,500W space heater with headroom to spare.”
thepowerpick.com / mensjournal.com — C1000 Gen 2 review · 2026 · [positive]
- B4
“Reviewers describe it as a refined, powerful, fast-charging update to a popular 1kWh platform, widely rated the mid-size unit to beat in 2026.”
thepowerpick.com / powerstationadvisor.com — C1000 Gen 2 review · 2026 · [positive]
Research compiled August 9, 2026.
What Owners Actually Report
Drawn from 21 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 Ultra X
11 claims from 7 comments · 2 from owners · 0 with figures
- Shipping
- 1 · 100% negative
- Build quality
- 2 · 82% negative
- Price & value
- 3 · 100% negative
- Solar input
- 2 · 48% negative
- Expandability
- 2 · 0% negative
What owners complain about
Ordered a DPUX at launch and was shipped a plain DPU battery instead; returned it.
Shippingowner9 agreedsource →
Refuses to use the included DC isolator rotary switch over arc-fault fire risk; uses own breakers.
Build qualityowner1 agreedsource →
Believes EcoFlow relabeled the DPU battery as DPUX and raised the price.
Price & value9 agreedsource →
What owners praise
Says it is the exception among portables that is not solar-input limited, at a much higher price.
Solar input6 agreedsource →
An excellent whole-home backup alternative to a traditional generator.
Other4 agreedsource →
Adding batteries or a second inverter is plug-and-stack versus bus bars, fuses and conduit.
Expandability5 agreedsource →
Anker SOLIX C1000 Gen 2
22 claims from 14 comments · 18 from owners · 6 with figures
- Price & value
- 4 · 0% negative
- Runtime
- 3 · 15% negative
- UPS switchover
- 2 · 0% negative
- Inverter & surge
- 1 · 0% negative
- Solar input
- 1 · 0% negative
What owners complain about
Gen 2 loses the gen 1's ability to add an expansion battery.
Expandability23 agreedsource →
Same app failure as his other brands: paired devices go missing on later launches.
App & firmwareowner2 agreedsource →
Can only pull 100W from the C1000 Gen 2's 12V ports and cannot confirm how XT60i sensing works.
Otherownersource →
What owners praise
Two units keep his gas furnace, three fridge/freezers and network alive for 5+ hours.
Runtimemeasuredowner15 agreedsource →
Anker 1000 gen 2's edge is a 2000W inverter, also at 25 pounds.
Inverter & surgemeasuredowner8 agreedsource →
Got the C1000 gen 2 on sale for $379 plus a $219 200W panel.
Price & valuemeasuredowner6 agreedsource →
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 Ultra X if you…
- →You have 240V loads, a well pump or a range or a central AC, and a plan to wire this into your panel. The 12,000W continuous and 45,000W surge exist for exactly that, and nothing in the C1000's 2,000W and 3,000W is a smaller version of it.
- →You're building out a skoolie or a big rig where 298.7 lbs across several chassis is a mounting problem rather than a carrying problem, and you already have roof for panels. The 10,000W solar ceiling only pays you back if you have somewhere to put that much panel.
- →You'd rather own one system than a growing pile of boxes. Set $7,999 against twelve C1000s at $6,600 and the difference reads as $1,399 for integration, not as a markup.
Buy the SOLIX C1000 Gen 2 if you…
- →Your list is a CPAP, a laptop, a router and phones. 320Wh for a CPAP night against 870Wh usable means you will never see the bottom of it on a normal night.
- →You need the thing that goes in the trunk. 24.9 lbs is a one-hand lift, and it happens to carry the faster laptop port of the two at 140W USB-C against 100W, so it's the better desk companion as well as the portable one.
- →You want backup that works this week with no installer involved. Plug it in, charge it, put it in a closet. Reviewers put a full recharge at about 49 minutesB1, so topping it off ahead of a storm is a lunch break rather than a project.
If neither fits
Skip both if your real number sits above the C1000's 1,024Wh and nowhere near 12,288Wh. That's the van-lifer whose day runs 4,685Wh, where the C1000 covers about 19% of it (870Wh usable against 4,685) and the DELTA is a fixed installation; the two-night camper at 2,100Wh; and anyone who wants a fridge and lights through a full 8-hour outage rather than half of one. The C1000 is too small for those days and the DELTA is a building's power system, so the answer is the mid-size portable class that sits in the gap between them, which neither of these occupies. Separately, if what you want is whole-home backup on a budget, get a transfer-switch installation quote before you get attached to any box. The $7,999 here is the battery, not the project.
The Bottom Line
Buy the C1000. The DELTA Pro Ultra X takes all six scenarios on this page, and only the blackout row describes something it would really be doing, because the other five involve carrying it somewhere. At 24.9 lbs against 298.7, that isn't a comparison. It's two different purchases filed under the same category label.
The figure that should settle it isn't the price gap, it's what the price gap buys. Six cents a lifetime kilowatt-hour separates these units, so nobody is being robbed in either direction. What the extra money buys is a 12,000W inverter your panel can accept. If you can name the 240V circuit you want backed up, go get the DELTA and book the install. If you can't, the C1000 does your list and leaves $7,469 in your pocket.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Is the DELTA Pro Ultra X portable at all?
No. 298.7 lbs is the system total across the battery modules and inverter rather than a single case with a handle, since the 12,288Wh base is built from two 6,144Wh modules. Once it's placed and cabled, it stays placed. If you need something that moves between the house and the car, that's the C1000 at 24.9 lbs.
Can I buy the C1000 now and add capacity later instead of going big?
You can, and it will get you more hours of the same thing. Anker expansion batteries grow the 1,024Wh base behind the same 2,000W inverter and the same 600W solar ceiling. What growing the C1000 never gets you is 12,000W or a 240V circuit, so if that's where you're eventually headed, expansion isn't a bridge to it.
Why does the cheap one look better per watt-hour if the big one wins everything?
Because they're priced on capability, not on cells. $530 divided by 1,024Wh is $0.54 a watt-hour, against $7,999 divided by 12,288Wh at $0.65. Across their rated lives the gap narrows to six cents a kilowatt-hour, thirteen against nineteen. The $7,469 difference is buying an inverter and an installation, not better storage.
Will the SOLIX C1000 Gen 2 run my refrigerator during a blackout?
On wattage, almost certainly. It lists 2,000W continuous and 3,000W surge, and reviewers report it running a 1,500W space heater with headroom left. The limit is energy, not watts. With 870Wh usable against an 8-hour outage list of 1,645Wh, which averages about 206W, you get roughly four hours rather than eight. Daylight changes the math, since 1,024Wh at a 600W solar ceiling refills in just under two hours of good sun.
Which one is quieter?
The spec sheets say 30 dBA for the DELTA and 35 for the C1000, but those are single bucketed figures that don't describe the same operating state, so don't decide anything on them. The measurement that matters for the C1000 is what reviewers found under load: quiet below about 200W, and around 55 dB while fast-charging or running past 1,000W. For a bedroom, that means keeping it off the charger overnight.
Related comparisons
Where to buy
EcoFlow DELTA Pro Ultra X
$7,999.00
$7,999.00 · direct from EcoFlow
Last checked 1 day ago. Prices move — check before you buy.
Anker SOLIX C1000 Gen 2Pick
$529.99
$529.99 · direct from Anker
Last checked 1 day ago. Prices move — check before you buy.
Prices may vary by retailer and are subject to change.