Head-to-head test
EcoFlow DELTA Pro Ultra vs Anker SOLIX C1000 Gen 2
The question isn't 6,144Wh against 1,024Wh, it's whether your load list has a 240V circuit on it, because that's the one thing the SOLIX C1000 Gen 2 can't be talked into doing.
Full profiles: EcoFlow DELTA Pro Ultra → · Anker SOLIX C1000 Gen 2 →
Written by Gunner GustafsonUpdated
Whole-Home Backup Tester, Station Arena Test Desk
Spec deltas
181.8 lbs against 24.9 lbs is not a portability footnote here, it's the whole decision. The DELTA Pro Ultra is hardware you site once and then live around: pick the spot, get it placed, and after that it's an appliance with an address. The SOLIX C1000 Gen 2 you lift with one hand and set in a footwell.
Both cover a CPAP overnight several times over, so capacity is not what separates them. The Ultra holds 6,144Wh and pushes 7,200W continuous with 10,800W of surge behind it; the Anker holds 1,024Wh and pushes 2,000W with 3,000W of surge. The spec table will make the bigger one look like a straight upgrade, and it isn't one. The Ultra carries two 240V outlets and a 30A RV socket, and the Anker's record shows none of either. Split-phase and shore-power loads are a category the small box cannot enter; nearly everything else on a normal list, it handles.
Where the money goes is stranger than the sticker suggests. Over its whole rated life the Ultra is the dearer electricity, not the cheaper, and its 3,500-cycle floor is actually below the Anker's 4,000. What $3,669 buys is simultaneity: 7,200W delivered at one instant, a 5,600W solar ceiling against 600W, and ten years of cover instead of five. Buy it for what it does in a single moment, not for what it works out to per unit over a decade.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
So on the profile most home-office buyers are actually shopping for, the difference between these two is one small thing unplugged versus 4,312Wh of battery you never touch. The Anker also carries the stronger USB-C port of the pair, 140W against the Ultra's 100W, which covers a laptop that would otherwise want an AC brick, and six AC sockets to the Ultra's three for everything else on the desk.
The Remote Workday profile needs 910WhSOLIX C1000 Gen 2: 1,024Wh nameplate, 870Wh after the grid's flat 15% derate, leaving it 40Wh shortDELTA Pro Ultra finishes the same day with 4,312Wh unused
Why it mattersIf your load list is a desk, buy the Anker and trim 40Wh off the day. That's the entire fix.
continuous output
That makes this a wiring question wearing a battery question's clothes. A well pump, a central AC compressor, a dryer or an RV shore cord puts you on the Ultra's side of the line before watt-hours are discussed at allA4. If none of those are on your list, its 7,200W is ceiling you pay for and never see.
DELTA Pro Ultra: two 240V outlets and one 30A RV socket, 7,200W continuous, 10,800W surgeSOLIX C1000 Gen 2: no 240V outlet and no 30A RV socket on its record, 2,000W continuousOwners describe the Ultra's 7,200W inverter carrying a 3-ton central ACA4
Why it mattersWrite the load list down first. One 240V line on it and you can stop comparing; none, and the Anker is the honest buy.
rated cycles
What the premium does buy is invisible to that arithmetic: 7,200W arriving at one instant, and a decade of cover rather than five years. The second one is real money if a fault surfaces in year six, and that is the honest cost of taking the cheaper box home.
DELTA Pro Ultra: 6,144Wh across a 3,500-cycle minimum is 21,504 kWh of rated energy, twenty cents a kilowatt-hourSOLIX C1000 Gen 2: 1,024Wh across a 4,000-cycle minimum is 4,096 kWh, thirteen cents a kilowatt-hourWarranty runs 10 years on the Ultra against 5 on the Anker
Why it mattersDon't buy the Ultra as an investment in cost per kilowatt-hour. Buy it because you need whole-house wattage in one enclosure, and accept that the small box is the cheaper electricity.
A 2,100Wh weekend is a 2kWh-class portable's job. That's a size up from the Anker, and it's a size that exists. Nothing on the market is a size down from 181.8 lbs.
The Weekend Camping profile needs 2,100WhDELTA Pro Ultra covers it with 3,122Wh to spare, but it's recorded as stationary at 181.8 lbsSOLIX C1000 Gen 2 covers about 41% of it and finishes 1,230Wh short
Why it mattersIf two nights of 2,100Wh is why you're here, neither of these as bought is your answer. Shop one class larger than the Anker instead.
The specific dimensions that decide these two units — everything else is a tie.
Portability & Form Factor
Selected because: 181.8 lbs against 24.9 lbs is the fork in this page: one unit gets sited once, the other rides in a footwell.
weight
A 181.8 lb system arrives as boxes and stops being furniture-adjacent about an hour later. It wants a ground floor, a spot near the panel, and a route a dolly can take, and the honest way to read that number is as the first line of an installation rather than the last line of a spec sheet. The Ultra's own record calls it stationary, and the tailgate profile is where that bites: it covers the 670Wh with 4,552Wh spare and still loses the row, because the parking lot is 181.8 lbs away.
24.9 lbs is the other kind of number. It's a one-handed carry from the trunk, which is why the small unit wins the one scenario where getting there is the test. If you want the same energy in a portable shape you don't buy a lighter Ultra, because there isn't one; you buy more of something small.
Your Life, Your Pick
Selected because: Four of the six load profiles turn on whether 870 usable watt-hours finishes your day, and one of them misses by 40.
870 usable watt-hours is the ruler for this whole page. It covers a CPAP night with 550Wh left and the 670Wh tailgate with 200Wh left, it misses a 910Wh workday by 40Wh, and it gets about halfway through the 1,645Wh outage profile before it's done. Read down the rows and the pattern isn't that the Anker is weak, it's that it's sized for evenings and days out rather than for days indoors.
The one row where the Ultra's own margin gets thin is worth noticing: a 4,685Wh van-life day leaves it at 90% used with 537Wh in hand. Everywhere else it finishes with thousands of watt-hours untouched, which is the polite way of saying most readers would be buying reserve they never spend.
Lifetime Value
Selected because: 21,504 kWh of rated energy against 4,096, and the expensive unit is still the dearer electricity of the two.
cost / lifetime kWh
The instinct that a big battery amortises better than a small one dies on this pair. The Ultra's 21,504 kWh of rated energy is five times the Anker's 4,096, but it costs more than five times as much to get, so the per-kilowatt-hour figure lands in the small unit's favour. Its 3,500-cycle floor sitting below the Anker's 4,000 finishes the argument.
The warranty is the real counterweight, and it's the one number here that gets more important the longer you keep the thing. Ten years of cover against five means the Ultra is still the maker's problem in year six, while the Anker's back half is yours. That's a trade a lot of buyers should take at this price, but it is a trade, not a bonus.
What the Specs Don't Tell You
Selected because: All three cards that fire are about the DELTA Pro Ultra: its weight, its UPS class, and a warranty gap that only bites in year six.
rated cycles
Every card that fires here points at the same unit, and only one of them is a complaint. The 181.8 lb card is the page's thesis in warning form. The UPS card is close to a non-event for most readers: the Ultra is classed no-break by its maker, the Anker is rated no worse than 10ms, and either rating should carry a desktop and a router through a cut, with the caveat that both are published classifications rather than stopwatch results.
The warranty card is the one to actually weigh, because it's the only place the cheap box is buying you less of something that matters. A 1,024Wh pack rated for 4,000 cycles will very plausibly still be working when its paperwork isn't.
Strengths & trade-offs
EcoFlow DELTA Pro Ultra
Strengths
- +Larger battery capacity
- +Higher AC output
- +Longer warranty
- +Faster solar charging
Trade-offs
- –Substantially more expensive (+$3,669) than the SOLIX C1000 Gen 2.
- –Significantly heavier (+156.9 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 $3,669 less
- +Lighter by 156.9 lb
Trade-offs
- –Weaker inverter (-5,200W) 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
Two nights at 2,100Wh is the one profile where both answers are no. The DELTA Pro Ultra has 3,122Wh to spare and no way to get to the site; the SOLIX C1000 Gen 2 gets you to Saturday night and then runs 1,230Wh short. The fix is a class up from the Anker, not either of these as bought.
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
870 usable watt-hours against the 1,645Wh this profile wants is about half an outage: the SOLIX C1000 Gen 2 reaches hour four and stops. The DELTA Pro Ultra finishes with 3,577Wh untouched, which is the next two outages as well.
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
Either unit
A CPAP is about 40W for eight hours, so both of these cover the night at least twice over — capacity isn't the question here. The only published difference is fan noise, and it can't settle this: the DELTA Pro Ultra is rated 30dB and the SOLIX C1000 Gen 2 35dB, but they are two makers' figures, each measured its own way. Neither settles which box is quieter at a bedside. Buy whichever is cheaper or easier to carry.
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
The SOLIX C1000 Gen 2 comes up just short — it needs 910Wh and has 870Wh usable, a 40Wh gap (its nameplate 1,024Wh actually clears this — the flat 15% conversion allowance is what tips it under). Trim that much — one small appliance's worth across the day — and it finishes. The DELTA Pro Ultra covers it outright with 4,312Wh 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
SOLIX C1000 Gen 2
400W of peak draw is the test and both units start it without complaint. Only one of them reaches the parking lot: the SOLIX C1000 Gen 2 covers the 670Wh with 200Wh left and weighs 24.9 lbs. The DELTA Pro Ultra's problem here was never the battery.
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
A 4,685Wh day is where the DELTA Pro Ultra stops looking like overkill and starts looking sized: it ends the day 90% used, 537Wh in reserve and no more. The SOLIX C1000 Gen 2 covers 19% of the same day, which isn't a near miss, it's a different appliance.
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 runs 25.5h vs 4.2h.
$4,199 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 0–348.2hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–69.6hHigh-Draw Appliances
These reveal the real limitsscale 0–5.2h¹ 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 Anker SOLIX C1000 Gen 2
Buy the SOLIX C1000 Gen 2 at $530. It is the cheaper electricity of the two over its rated life, it covers the loads people actually lose power for, and at 24.9 lbs it can be wherever the problem is. The DELTA Pro Ultra is the better machine and it isn't close on paper: 7,200W continuous, 10,800W of surge, two 240V outlets, a 30A RV socket, ten years of cover. But 181.8 lbs is a siting decision rather than a purchase decision, and the loads that justify $4,199 are 240V loads. If your list has a well pump, a central AC compressor, a dryer or an RV shore cord on it, the Anker is not in the running at any price and the rest of this page reads as an argument for the Ultra. If it doesn't, you're paying $3,669 for headroom the load profiles say you never reach.
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.
$549.99 · direct from Anker
Last checked 16 days ago. Prices move — check before you buy.
or check the DELTA Pro Ultra price$4,199.00 list
Written by Gunner Gustafson, Whole-Home Backup Tester · Station Arena Test Desk · Updated September 19, 2026
Black Friday · 38 days out
Prices to beat:DELTA Pro Ultra $3,999SOLIX C1000 Gen 2 $530
The lowest we have recorded for each. We have never seen the SOLIX C1000 Gen 2 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, 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 rates 4.9/5 (95th percentile of 20 Home Backup-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.
181.8 lbs: You Site This, You Don't Carry It
Nobody lifts 181.8 lbs, and nobody moves these boxes twice. Choose the spot before you buy: ground floor, near the panel, somewhere a dolly can reach. The decision you're making is closer to installing a water heater than to buying a battery, and everything the DELTA Pro Ultra is good at happens at that one address.
UPS Switchover: 0ms-rated vs ≤10ms
Both list a UPS mode, at different rated speeds. The DELTA Pro Ultra is rated 0ms — a no-break design on paper, which is the maker's classification rather than a stopwatch result. The SOLIX C1000 Gen 2 is rated ≤10ms — quick enough on paper that desktop PCs and routers should ride through, treating that as the rating it is. If a computer with unsaved work is the thing being protected, the stated class is worth the attention; nothing here is a lab result.
Ten Years Against Five
Year six is where this stops being trivia. The DELTA Pro Ultra is covered for 10 years; the SOLIX C1000 Gen 2's cover ends at 5, and a 1,024Wh pack rated for 4,000 cycles will very plausibly still be working long after its paperwork has expired. Buying the cheaper box means owning the back half of its life yourself. At the gap between these two, that's a rational trade rather than a free one.
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 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 still delivers more over its shorter horizon (21,504 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-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 tested subscription paywalls for advanced app features in early 2025 and shelved the plan after the community pushed back, and it offers no parts or service once the warranty is up. On a unit covered for ten years the second of those matters more than the first: the plan is to keep this thing for a decade, and the exit ramp at the end of it is a new purchase.
Anker
Ecosystem
7-8 SOLIX portable power stations across C-series (compact) and F-series (flagship), plus the X1 home energy system
Support
US-based support. Historically known for incredible no-hassle replacements, but recent reports describe AI-driven support agents giving generic responses and complex return logistics for heavy units (hazmat shipping). The Anker brand reputation is still strong, but SOLIX-specific support quality is trending down.
Community
Moderate — active Reddit (r/Anker, r/AnkerSOLIXCommunity) and growing. Benefits from Anker's massive consumer electronics brand awareness.
App experience
Rated 4.5/5 iOS (~1,100 ratings) · 4.3/5 Android
Unique strength
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 built its name on no-hassle replacements, and SOLIX support is drifting from that standard toward AI-first agents and awkward return logistics on heavy units. At 24.9 lbs the C1000 Gen 2 is the easiest kind of SOLIX to send back, which is a small mercy but a real one. Firmware updates have also removed features without notice, so don't buy it for something you haven't seen working on the unit in your hands.
Analyst note
EcoFlow's ecosystem is the widest in portable power and its community the largest, which is worth real money on a system you'll expand and live with for a decade. Anker's pitch is narrower and more honest about it: fewer models, value-to-mid pricing, and dollars-per-watt-hour that this size class is specifically good at. Support is the wobble on both sides, so buy from a retailer whose return policy you'd actually use.
Growth path
DELTA Pro Ultra
EXPANDABLESupports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 6,144Wh.
Accepts up to 5,600W 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 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.
Adequate ports for most setups, but heavy users may want a power strip.
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's higher solar ceiling (5,600W 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
Field evidence on the Ultra is thinner than its price suggests, and most of what exists is maker and reviewer material rather than long-term ownershipA0A1A2A3. The owner reports we do have are consistent and unglamorous: quick setup, strong solar input, useful app monitoring, and a 7,200W inverter that carries a 3-ton central AC without theatricsA4.
One claim needs handling carefully. EcoFlow's material, and the reviews built on it, describe the unit as silent below 2,000WA3, while our own record carries a published 30dB rating for it. Those two can't both be literal, and neither came from a meter in your bedroom, so no part of this verdict rests on how quiet it is. If a silent room is the requirement, go looking for hands-on measurements before you commit.
“6,144Wh per battery with 7,200W continuous output (10.8kW surge), expandable to 90kWh across a system for a household — over 30 days of essential backup.”
Sources
ecoflow.com · homedepot.com · autoboosting.com · ecogadgethub.com
Anker SOLIX C1000 Gen 2
Reviewers are unusually aligned on the C1000 Gen 2: a refined, fast-charging update to a 1kWh platform, widely called the mid-size unit to beat this yearB4. The headline gain is HyperFlash charging, roughly 49 minutes to full against the original's 58 to 80B1, and its 2,000W continuous clears a 1,500W space heater with headroom leftB3.
The complaint, and it's the only consistent one, is the fansB2. Quiet at low draw, around 35 dB under 200W, and audibly working at about 55 dB once you're past 1,000W or charging at speedB2. So the two things people like most about this unit, the quick refill and the real 2,000W, are exactly the two conditions that make it loud. If it lives in the room you sleep in, recharge it during the day.
“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 scale (to 90kWh), 7,200W output, online UPS, silent operation under load, and industry-fast charging are the standout features. [DELTA Pro Ultra · 2 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
“6,144Wh per battery with 7,200W continuous output (10.8kW surge), expandable to 90kWh across a system for a household — over 30 days of essential backup.”
ecoflow.com / homedepot.com — DELTA Pro Ultra · 2026 · [positive]
- A2
“LFP chemistry rated for over 3,500 cycles to 80% (10+ years of use).”
ecoflow.com / autoboosting.com — DELTA Pro Ultra review · 2026 · [positive]
- A3
“Industry-fast 8,800W charging tops up two batteries in about 2 hours; an online UPS protects sensitive electronics round the clock, and it runs at 0 dB (silent) for draws under 2,000W.”
ecoflow.com / ecogadgethub.com — DELTA Pro Ultra review · 2026 · [positive]
- A4
“Owners call it a powerful, easy-to-use whole-home backup with quick setup, strong solar input, and good app monitoring; its 7,200W inverter can power a 3-ton central AC.”
homedepot.com owner reviews — DELTA Pro Ultra · 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 September 19, 2026.
What Owners Actually Report
Drawn from 102 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
144 claims from 88 comments · 100 from owners · 35 with figures
- Price & value
- 22 · 18% negative
- Runtime
- 16 · 0% negative
- Expandability
- 17 · 16% negative
- Charging
- 11 · 4% negative
- Other
- 18 · 19% negative
What owners complain about
A second battery bought separately adds $1900, roughly doubling the cost.
Expandabilitymeasuredowner5 agreedsource →
After firmware updates max solar charging dropped from 7kW to 3.5kW.
App & firmwaremeasuredowner5 agreedsource →
Still charges at 7kW from a generator, so the cap looks solar-specific.
Solar inputmeasuredowner5 agreedsource →
What owners praise
Charges at 6000W from a gas generator, hitting 100% in a little over 3 hours with some sun.
Chargingmeasuredowner36 agreedsource →
Costco deal gave him the DPU with two batteries, 12kWh, for $4,500.
Price & valuemeasuredowner53 agreedsource →
Delivered with batteries manufactured less than 90 days earlier.
Shippingmeasuredowner53 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 if you…
- →Your load list has a 240V line on it: a well pump, a central AC compressor, a dryer, or a 30A RV shore cord. The Ultra has two 240V outlets and the RV socket; the Anker's record has neither, so this isn't a close call at any price.
- →You're backing up a house at a fixed address and you have somewhere to put 181.8 lbs that isn't up a flight of stairs. Owners describe it carrying a 3-ton central ACA4, which is the class of load this is for.
- →Your daily off-grid draw runs into thousands of watt-hours. On the 4,685Wh van-life profile the Ultra finishes with 537Wh left while the Anker covers 19% of the day, and no arrangement of the small unit closes that.
- →You're building toward a real array. A 5,600W solar ceiling against 600W is the difference between roof-scale charging and a couple of portable panels.
Buy the SOLIX C1000 Gen 2 if you…
- →You want one box that goes where the problem is: a tailgate, a campsite table, a job site, a nightstand. It covers the 670Wh tailgate with 200Wh spare and a CPAP night with 550Wh spare, and 24.9 lbs is a one-handed carry.
- →You work from a desk and want a power cut to be a non-event. It misses the full 910Wh workday by 40Wh, so trim one small load, or run the laptop off its 140W USB-C port and stop thinking about it.
- →You want an evening of outage cover rather than a full day of it. 870Wh usable is about half of the 1,645Wh eight-hour profile, so buy it knowing which half you're getting.
- →You care more about what a unit costs to own than what it can lift: 4,000 rated cycles against the Ultra's 3,500 floor, in a box that costs $530.
If neither fits
If two nights of camping at 2,100Wh is why you're here, close the tab on both: the Anker finishes 1,230Wh short and the Ultra can't come with you. What you want is a 2kWh-class portable, one size up from the Anker. And if you came looking for whole-home backup but you can't site 181.8 lbs or don't have a 240V circuit to wire it to, the Ultra will let you down in a way no spec sheet warns about, because you'd be buying an installation's capability and then running it off extension cords. That conversation belongs with an electrician and a fixed home battery, not with either unit on this page.
The Bottom Line
Buy the SOLIX C1000 Gen 2, and buy it for what it is rather than as a downgrade from the Ultra. It's the cheaper electricity across its rated life, it covers the loads people actually lose power for, and 24.9 lbs means it's wherever the outage happens instead of wherever it was installed. The Ultra wins every wattage in the table, and not one of those wattages helps when the thing you needed powered was in the driveway.
One line flips this, and it's a 240V one. Two 240V outlets and a 30A RV socket sit on the Ultra and nowhere on the Anker's record, and no amount of capacity buys a socket that isn't there. Well pump, central AC compressor, shore cord: any of those and the Ultra is the only unit on this page, with 181.8 lbs of sited hardware as the price of admission. None of them, and you'd be paying $3,669 for reserve the load profiles say you never reach.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Can the Anker SOLIX C1000 Gen 2 back up my house?
Not the way a whole-home system does. Its record shows no 240V outlet and no 30A RV socket, so anything on a split-phase circuit, a well pump or a central AC compressor included, is out of reach regardless of capacity. With 870Wh usable it covers about half of the 1,645Wh eight-hour outage profile, which makes it an evening of small loads rather than a day of house.
Is the DELTA Pro Ultra portable at all?
No. It's recorded at 181.8 lbs across its boxes and its own record calls it stationary: you choose a spot and then you leave it there. It will ride in a truck bed if you insist, which is why the tailgate profile goes to the 24.9 lb Anker even though the Ultra holds six times the capacity (6,144Wh against 1,024Wh).
Which one is actually cheaper to own over its life?
The Anker, and not narrowly. Across its rated life it works out to thirteen cents a kilowatt-hour against the Ultra's twenty, because 4,000 cycles on a 1,024Wh pack is a lot of cheap energy and 3,500 cycles is the Ultra's floor. The catch is coverage: five years of warranty against ten, so a fault in year six is your bill rather than EcoFlow's.
Does the DELTA Pro Ultra's UPS protect a computer better than the Anker's?
Both should carry a desktop and a router through a cut. The Ultra is classed no-break by EcoFlow, which is the maker's classification rather than a measured time, and the Anker is rated no worse than 10ms, which on paper is quick enough for PCs and network gear to ride through. If you're protecting something with a tighter tolerance than that, the stated class is the Ultra's edge, but nothing here is a lab result.
How fast does each one recharge?
Off the sun they aren't the same species: the Ultra accepts up to 5,600W of solar input against the Anker's 600W, which is the gap that matters if you're refilling day after day. From the wall, reviewers clock the Anker at roughly 49 minutes to full with HyperFlash on. The trade is noise, since fast charging is exactly when its fans are loudest.
Where to buy
EcoFlow DELTA Pro Ultra
$4,199.00
$4,199.00 · direct from EcoFlow
Last checked 16 days ago. Prices move — check before you buy.
Anker SOLIX C1000 Gen 2Pick
$549.99
$549.99 · direct from Anker
Last checked 16 days ago. Prices move — check before you buy.
Prices may vary by retailer and are subject to change.