Head-to-head test
EcoFlow DELTA 2 Max vs Anker SOLIX C1000
Nearly twice the battery for more than twice the price, and on this page that buys exactly one outcome: the eight-hour outage the SOLIX C1000 only gets a little over half way through.
Full profiles: EcoFlow DELTA 2 Max → · Anker SOLIX C1000 →
Written by Ian SchneiderUpdated
Solar & Off-Grid Tester, Station Arena Test Desk
Spec deltas
The DELTA 2 Max holds 2,048Wh and weighs 50.7 lbs. The SOLIX C1000 holds 1,056Wh, weighs 28.4 lbs, and costs $600 less. Almost everything else on the two spec sheets is a mirror: at least 3,000 cycles each, five-year warranties on both, six AC outlets apiece, 100W over USB-C, a transfer time rated no worse than 20ms, and expansion batteries available for either one.
So the question is narrow. What does the extra 992Wh actually do? Across the six scenarios modelled here it changes the answer once: the DELTA 2 Max finishes an 8-hour blackout and the SOLIX C1000 doesn't. It also takes the remote workday, but only because the C1000 lands 12Wh under the line, a rounding error produced by the page's flat 15% usable allowance, since the C1000's nameplate 1,056Wh covers that day's 910Wh outright. And in the two scenarios above 2,000Wh, a camping weekend and a van day, both units come up short and the right answer is a bigger station.
Which leaves weight and money doing the real work. 50.7 lbs is a two-hands, bent-knees lift you plan around; 28.4 lbs is a heavy carry-on you swing out of the trunk with one arm, and that difference shows up every time you use it, not just during a storm. Buy the DELTA 2 Max if you are buying for the storm. Otherwise the SOLIX C1000 is the one to get, and the $600 you keep is real money toward the panels either box needs to refill off-grid.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
continuous output
The interesting part is the gap between those two figures. Roughly 1,200W to 1,800W is a band of loads the SOLIX C1000 will carry all afternoon and may refuse to start from cold, and at a 3x inrush that band opens at 800W. The DELTA 2 Max has no such band at 2x, and at 3x its own starts at 1,600W. That is what the surge column is really telling you, and it isn't the same as a bigger number.
DELTA 2 Max: 2,400W continuous, 4,800W published peak, a 2x ratioSOLIX C1000: 1,800W continuous, 2,400W published peak, a hair over 1.3xMotors draw 2-3x their rated wattage for the instant they start
Why it mattersIf the heaviest thing on your list is a pump, compressor or saw rated above about 1,200W, the DELTA 2 Max is the only one of these two to trust with starting it. If the heaviest startup you will ever ask for is the 400W the tailgate scenario needs, the surge column is decoration.
The 992Wh you are paying for, 2,048 minus 1,056, buys one more rung rather than a different ladder. It moves you from most of an eight-hour outage to all of it, barely. The SOLIX C1000's miss in that same scenario is 747Wh, which is not a shortfall you trim your way out of; that is a smaller class of unit doing what a smaller class of unit does.
8-hour blackout needs 1,645Wh; the DELTA 2 Max has 1,741Wh usable under the page's flat 15% allowance and finishes with 96Wh leftSame scenario: the SOLIX C1000 has 898Wh usable and stops 747Wh short, a little over half the nightWeekend camping needs 2,100Wh and leaves the DELTA 2 Max 359Wh short
Why it mattersBuy the DELTA 2 Max if the eight-hour night is the specific thing you are insuring against. If your outage list runs longer than that, stop comparing these two, because the van day's 4,685Wh leaves even the DELTA 2 Max 2,944Wh short.
solar input
So the DELTA 2 Max's input advantage isn't speed, it's permission. A 1,000W ceiling only pays out once you own 1,000W of panel, and until you do, both boxes are limited by the array on the ground rather than the port on the case.
DELTA 2 Max: 2,048Wh behind a 1,000W solar input ceilingSOLIX C1000: 1,056Wh behind a 600W ceilingThe growth-path note credits the DELTA 2 Max's stronger off-grid path to that higher ceiling
Why it mattersIf you already own a serious array or plan to buy one, the higher ceiling is worth paying for and the growth path is real. If your solar plan is one or two folding panels, that column is a promise you won't collect on.
That makes noise a load question rather than a spec question. A CPAP is about 40W in the scenario here, nowhere near the roughly 500W where the SOLIX C1000's fans come upB1, and the DELTA 2 Max's loud behaviour is tied to heavy load or chargingA1. For the one use where noise decides everything, both are quiet.
DELTA 2 Max spec row: 30dB, which our own research note flags as the maker's best-case floorA0One review records roughly 52dB from the DELTA 2 Max under heavy load or charging, with a Quiet Charging mode that trades noise for charge timeA1The SOLIX C1000 publishes no noise figure at allReview coverage puts the SOLIX C1000 near-silent below about 500W and audible during fast charging or output near its limitB1
Why it mattersIf you're buying for a bedside CPAP, ignore both noise rows and count nights instead: 320Wh a night against 1,741Wh usable is five nights on the DELTA 2 Max, and against 898Wh it's not quite three on the SOLIX C1000.
The specific dimensions that decide these two units — everything else is a tie.
Your Life, Your Pick
Selected because: One scenario out of six separates these units: the DELTA 2 Max finishes an 8-hour blackout and the SOLIX C1000 stops 747Wh short of it.
Six scenarios, and the split is cleaner than the scoreline looks. Three of them, the CPAP night, the tailgate and the remote workday, are small enough that the SOLIX C1000 either covers them outright or misses by 12Wh, which is the flat 15% allowance talking rather than the battery. Two of them, a 2,100Wh weekend and a 4,685Wh van day, are too big for both units, and the page says so plainly. That leaves the 8-hour blackout as the only row where the extra capacity changes an outcome instead of a percentage.
Read the percentages as headroom, not as scores. The DELTA 2 Max runs the tailgate at 38% used and the workday at 52%, so most of what you paid for sits in reserve on an ordinary day. That reserve is exactly what you want at hour six of an outage, and exactly what you're carrying up the basement stairs the rest of the year.
Portability & Form Factor
Selected because: 22.3 lbs apart, 50.7 against 28.4, and here the lighter unit is also the cheaper one, so weight isn't the usual trade-off.
weight
22.3 lbs is the difference between a unit you move and a unit you position. At 50.7 lbs the DELTA 2 Max is a two-person job up a flight of stairs, or a one-person job you'll do carefully, once, and then leave where it landed. At 28.4 lbs the SOLIX C1000 goes into the trunk, out of the trunk, onto the picnic table and back without any of that planning.
What makes this pair unusual is that the lighter box is also the cheaper one. Normally you pay a premium for light. Here the weight comes attached to capacity you may never call on, which is the same conversation as the rest of the page: the DELTA 2 Max asks you to carry the reserve as well as pay for it.
Lifetime Value
Selected because: Both packs are rated for at least 3,000 cycles, so the only question left is whether nearly twice the battery is worth more than twice the price.
cost / lifetime kWh
Both packs are rated for at least 3,000 cycles, so neither one wears out ahead of the other. They simply deliver different totals on the way: 6,144kWh from the DELTA 2 Max, 3,168kWh from the SOLIX C1000. Spread across those lives, the two land three cents a kilowatt-hour apart, with the SOLIX C1000 on the cheaper side. That's not a gap that decides anything. What it does is decline to rescue the DELTA 2 Max's price.
Read that the right way round. The DELTA 2 Max isn't overpriced, it's priced like what it is, nearly twice the battery for a bit more than twice the money. It just means there's no hidden discount waiting at the end of the pack's life to justify the sticker. The justification has to come from the blackout row or it doesn't come at all.
What the Specs Don't Tell You
Selected because: The surge card and the noise card both hinge on what the spec sheets don't say; the warranty card is a genuine dead heat at five years each.
The surge card reads as a win for the DELTA 2 Max, and it is, but the useful figure isn't the 4,800W ceiling. It's what each ceiling divides down to once a motor pulls 2-3x its rating on startup. Do that division and the SOLIX C1000 turns out to have a band of loads it can run but may not start, while the DELTA 2 Max, at a 2x inrush, doesn't. Whether that matters is a question about your heaviest appliance, not about the two headline numbers.
The noise card is the one to read slowly, because a missing number scores like a defect and isn't one. The DELTA 2 Max publishes 30dB, a best-case floor rather than a measurement, and the SOLIX C1000 publishes nothing. Neither tells you what you'll hear at 2 a.m. The warranty card is the true dead heat: five years each, same terms, nothing to weigh.
Growth Path
Selected because: Both take expansion batteries, so growth comes down to solar input: 1,000W on the DELTA 2 Max against 600W on the SOLIX C1000.
solar input
Both units take their maker's expansion batteries, so start-small-and-add-later is available either way. The difference appears one step further out. As the bank grows, the DELTA 2 Max can pull 1,000W of solar into it and the SOLIX C1000 tops out at 600W, and a bigger bank behind the same straw takes proportionally longer to fill.
That's a genuine advantage for anyone heading off-grid, with one caveat worth saying out loud: an input ceiling is a ceiling, not a panel. The DELTA 2 Max's starts paying the day you own an array that can hit it. Until then both boxes charge at whatever the panels you actually have can deliver.
Strengths & trade-offs
EcoFlow DELTA 2 Max
Strengths
- +Larger battery capacity
- +Higher AC output
- +Faster solar charging
Trade-offs
- –Substantially more expensive (+$600) than the SOLIX C1000.
- –Significantly heavier (+22.3 lbs), making it harder to move.
Anker SOLIX C1000
Strengths
- +Costs $600 less
- +Lighter by 22.3 lb
Trade-offs
- –Weaker inverter (-600W) 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
Neither unit gets through this one, which is the scenario most likely to surprise someone buying the bigger box. 2,100Wh leaves the DELTA 2 Max 359Wh short, about 83% covered, and the SOLIX C1000 1,202Wh short at 43%. It's a partial weekend either way: most of the list on one, the essentials on the other. The fix for both is a panel on the car roof at midday rather than a different battery.
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 2 Max
The DELTA 2 Max finishes this night with 96Wh left out of 1,741Wh usable, about the last 5% of the tank. That's a pass, not a comfortable one. The SOLIX C1000 stops 747Wh short, a little over half way through. If this row is why you're shopping, it's also the entire argument for the more expensive unit, and it's worth noticing that the same 96Wh of margin vanishes the moment your outage list grows by one appliance.
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
Both cover the night with room left over: 320Wh against 1,741Wh and 898Wh usable, so capacity decides nothing here. Buy on how many nights you want between charges instead, which is five on the DELTA 2 Max and not quite three on the SOLIX C1000. Noise would be the other decider, except one unit publishes a best-case floor and the other publishes nothing, which leaves you comparing two kinds of silence on paper.
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 2 Max
The SOLIX C1000 comes up just short — it needs 910Wh and has 898Wh usable, a 12Wh gap (its nameplate 1,056Wh 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 2 Max covers it outright with 831Wh 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
DELTA 2 Max
Both handle game day; the DELTA 2 Max keeps more in reserve (38% used vs 75%). Tailgating is a light load, though, so the number you'll feel is weight: 28.4 lbs for the SOLIX C1000 against 50.7 lbs for the DELTA 2 Max, from the trunk to the setup spot.
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
Neither unit covers this scenario's 4,685Wh: the DELTA 2 Max comes up 2,944Wh short (about 37% covered), the SOLIX C1000 3,787Wh (19%). This is well outside what either unit is for; the right answer here is a larger station, not a choice between these two.
Battery budget usedlower = more headroom
LOAD Mini-Fridge 150W×24h · Laptop 60W×4h · Phone Charger 15W×3h · LED Lights 40W×5h · Fan 75W×8h
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 2 Max runs 8.5h vs 4.4h.
$1,049 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 0–116.1hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–23.2hHigh-Draw Appliances
These reveal the real limitsscale 0–1.7h¹ 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
Take the SOLIX C1000. It matches the DELTA 2 Max on the things that usually cost money: at least 3,000 cycles, a five-year warranty, six AC outlets, 100W over USB-C, a transfer time rated no worse than 20ms, and expansion batteries if you want them later. It does the small jobs on this page for $600 less and 22.3 lbs less to carry. The DELTA 2 Max is not overpriced for what it is; it is simply twice the unit, and only one of the six scenarios here needs twice the unit. That one is the 8-hour blackout, where the DELTA 2 Max finishes with 96Wh of its 1,741Wh usable left and the SOLIX C1000 stops 747Wh short. If that night is your reason for buying, pay the $600 and stop reading. If it isn't, the SOLIX C1000 is the better-value box, and one reviewer's year with the unit ending at about 97% of original capacity says it holds upB2.
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.
Sold on Amazon · today’s price is on the listing
or check the DELTA 2 Max price$1,049.00 list
Written by Ian Schneider, Solar & Off-Grid Tester · Station Arena Test Desk · Updated September 19, 2026
Black Friday · 38 days out
Price to beat:DELTA 2 Max $949
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): 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 2 Max rates 3.8/5 (32nd percentile of 26 Large-class units), and SOLIX C1000 rates 4.7/5 (81st 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.
Surge: What Each Ceiling Can Actually Start
Motors pull 2-3x their rated draw for the instant they spin up, so divide each peak by that multiple rather than comparing peaks. The DELTA 2 Max's 4,800W absorbs a 2x inrush from anything up to 2,400W, which is everything it can run continuously. The SOLIX C1000's 2,400W is spent by a 2x inrush from a 1,200W motor, yet it runs to 1,800W, leaving a band of loads between those figures that it will carry steadily and may still refuse to start from cold. Worth knowing rather than worrying about: the heaviest startup any scenario on this page asks for is 400W, at the tailgate.
Warranty: No Difference
Both units carry the same 5-year warranty, so coverage isn't a tiebreaker here. Worth saying because the per-dollar framing can suggest otherwise: the SOLIX C1000 works out at 11.1 years of cover per $1,000 spent against the DELTA 2 Max's 4.8, but that spread is the price gap, not the terms.
Noise: One Floor, One Blank, No Comparison
The DELTA 2 Max's 30dB and the SOLIX C1000's empty row are not a quiet unit and a loud one. 30dB is the kind of figure makers publish as a best case, a floor reached at low load or in a quiet mode, and it says nothing about the fan at a high charge rate. The missing number says nothing at all. Neither is a measurement, so neither settles a bedroom purchase. Reason from the load instead: the CPAP scenario here draws about 40W, nowhere near either unit's working limit, and a fan's job is to move heat, which is what high charge rates and near-limit output make on either box.
Full record above — the Test Desk pick is the SOLIX C1000.
Check SOLIX C1000 price →or check the DELTA 2 Max 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
Both units have similar long-term ownership costs ($0.17/kWh vs $0.14/kWh). The price difference is what you see on the sticker — neither is a hidden bargain or rip-off. One thing to know reading the table: both carry the same 3,000-cycle rating, so the lifetime rows are sticker price and capacity in disguise — the wear horizon is identical and decides nothing here.
Brand trust
EcoFlow
Ecosystem
Largest in portable power — 12-15 models across DELTA Pro, DELTA 3, and RIVER 3 series, plus solar panels and smart home panels
Support
US-based phone/email/chat support (1-800-368-8604). Experiences are polarized — many report hassle-free prepaid-label replacements, but others report long waits and refurbished units sent for new claims. Pro tip: buying from Costco or Amazon gives you a stronger return safety net.
Community
Largest community in the space — Reddit r/Ecoflow_community (~31K members), multiple Facebook groups, and an official community forum
App experience
Rated 4.6/5 iOS (~8,400 ratings) · 4.2/5 Android (~17,000 ratings)
Unique strength
Fastest-charging technology (X-Stream), deepest product ecosystem, and most active innovation cadence. At the top of the range sit two whole-home paths: the TITAN line, one 5 kWh unit that grows to 30 kWh, and the DELTA Pro Ultra platform, which stacks batteries and inverters further — flagship paths, not line-wide features.
Worth knowing
Tested subscription paywalls for advanced app features in early 2025 before community backlash paused the plan. No parts or service offered out of warranty.
Anker
Ecosystem
7-8 SOLIX portable power stations across C-series (compact) and F-series (flagship), plus the X1 home energy system
Support
Anker's replacement reputation was built on its consumer electronics business, and SOLIX support is drifting from it: AI-driven first-line responses, and awkward return logistics for heavy units that ship as hazmat. The SOLIX C1000 is at least the light end of that problem at 28.4 lbs; the same return on a bigger SOLIX is a different kind of afternoon.
Community
Moderate — active Reddit (r/Anker, r/AnkerSOLIXCommunity) and growing. Benefits from Anker's massive consumer electronics brand awareness.
App experience
Rated 4.5/5 iOS (~1,100 ratings) · 4.3/5 Android
Unique strength
Parent brand trust from Anker's consumer electronics dominance. InfiniPower technology for long cycle life. Strong $/Wh value in the mid-size and larger units — the S2000, F2600 and C1000 are among the better buys per watt-hour in the catalog.
Worth knowing
Support quality appears to be declining from its historically excellent level. Firmware updates have removed features without warning. Expansion ecosystem is smaller than EcoFlow's.
Analyst note
Neither brand column wins this matchup. EcoFlow has the deeper ecosystem and the busier community, Anker has the parent-brand trust and the better price position, and both support stories are moving the same direction, EcoFlow's polarized and Anker's declining from a high base. The sensible move is the same whichever box you pick: buy where the retailer's return policy is strong, and treat the five-year warranty both units carry as the actual safety net.
Growth path
DELTA 2 Max
EXPANDABLESupports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 2,048Wh.
Accepts up to 1,000W 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 C1000
EXPANDABLESupports Anker expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 1,056Wh.
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 2 Max's higher solar ceiling (1,000W 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 2 Max
Field coverage for the DELTA 2 Max is thinner than its entry count suggests, since three of the four entries share a source domainA1A3A4, so read it as a handful of reviews rather than a consensus. The most useful entry is the fan note: roughly 52dB under heavy load or charging, a Quiet Charging mode that trades noise for charge time, and a recommendation to leave six inches of clearance for airflowA1. That's one review's figure rather than a chorus, but it's the only measurement anyone has attached to this unit, and it sits well above the 30dB on the spec row, which our own research note flags as the maker's best-case floorA0.
The durability read is positive and specific: LiFePO4 rated for 3,000+ cycles to 80%, and after six months of real use, no structural degradation and a unit that felt as solid as day oneA3. AC charging is quick, 0 to 80% in about 50 minutes and full in roughly 80A2. The summary the coverage lands on is still worth buying, with caveatsA4, which is roughly where the numbers on this page land too.
“Fast AC wall charging — 0 to 80% in about 50 minutes and a full charge in roughly 80 minutes.”
Sources
powerstationadvisor.com · pcworld.com · thesolarlab.com · protoolsadvisor.com · trailandkale.com
Anker SOLIX C1000
The SOLIX C1000's file has the one thing the DELTA 2 Max's doesn't, which is time: a year of it against six monthsB2A3. One reviewer ran theirs for over a year with no issues and about 97% of original capacity left, and in a 30-day stint as a home-office UPS it rode out seven brief outages with no shutdowns and no lost dataB2. That second detail matters more than it looks, because both units claim a transfer time no worse than 20ms and only one of them has a month of real outages behind the claim in our ledgerB2.
Fan noise is the knock, and the coverage is specific about when: audible during fast charging or output near the unit's limit, comparable to a desktop fan at speed, and near-silent under about 500WB1. Otherwise it's fundamentals done right, fast AC recharge, strong short-burst inverter behaviour, practical size and weight for a 1kWh box, and useful app monitoringB3, and it handles ordinary household appliances short of central AC and electric dryersB4. One note on provenance: some of the 2026 coverage describes the Gen 2 rather than this unit, and while general behaviour is treated as consistent across both, any Gen-2-specific figure would need separate verificationB0.
“One reviewer used their unit for over a year with zero issues and minimal battery degradation — about 97% of original capacity. In a 30-day home-office UPS test it handled 7 brief outages with no equipment shutdowns or data loss.”
Sources
outdoorgearlab.com · lifenhancer.com · rvoutfitting.com · outdoortechlab.com · wattsontheroof.com · technerdo.com · teqclub.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
- Solid LFP durability, fast charging, and ecosystem/expandability are the praise; loud fans under heavy load or charging are the recurring complaint. [DELTA 2 Max · 3 entries]
- Fan noise under fast charging or heavy load is the consistent knock; otherwise strong reliability, fast recharge, and practical size earn broad praise. [SOLIX C1000 · 3 entries]
- A1
“Fan noise is a significant issue — cooling fans can get loud, around 52 dB during heavy loads or charging; a Quiet Charging mode reduces noise but extends charge time, and giving it 6 inches of clearance helps airflow.”
powerstationadvisor.com / pcworld.com — DELTA 2 Max review · 2025-2026 · [negative]
- A2
“Fast AC wall charging — 0 to 80% in about 50 minutes and a full charge in roughly 80 minutes.”
thesolarlab.com / protoolsadvisor.com — DELTA 2 Max review · 2025-2026 · [positive]
- A3
“LiFePO4 chemistry rated for 3,000+ cycles to 80% with superior thermal stability; after 6 months of real use there was no structural degradation and it felt as solid as day one.”
powerstationadvisor.com / trailandkale.com — DELTA 2 Max review · 2025-2026 · [positive]
- A4
“Reviewers say it's still worth buying but with caveats — a versatile unit with expandability and ecosystem compatibility.”
thesolarlab.com / powerstationadvisor.com — DELTA 2 Max review · 2025-2026 · [mixed]
- B1
“Fan noise is the single most common complaint — the fans spin up audibly during fast charging or heavy output near the unit's limit, comparable to a desktop computer fan at speed. Under light loads (below ~500W) it's nearly silent.”
outdoorgearlab.com / lifenhancer.com — Anker SOLIX C1000 review · 2026 · [negative]
- B2
“One reviewer used their unit for over a year with zero issues and minimal battery degradation — about 97% of original capacity. In a 30-day home-office UPS test it handled 7 brief outages with no equipment shutdowns or data loss.”
rvoutfitting.com / outdoortechlab.com — Anker SOLIX C1000 long-term notes · 2026 · [positive]
- B3
“Nails the fundamentals: fast AC recharge, strong inverter performance for short bursts, practical size and weight for a 1kWh unit, and genuinely useful app monitoring.”
wattsontheroof.com / technerdo.com — Anker SOLIX C1000 review · 2026 · [positive]
- B4
“Handles virtually any household appliance except central AC and electric dryers; a popular 'sweet spot' 1kWh unit for RV and home backup.”
rvoutfitting.com / teqclub.com — Anker SOLIX C1000 review · 2026 · [positive]
Research compiled September 19, 2026.
What Owners Actually Report
Drawn from 110 comments on independent review channels — not from retailer reviews, which skew to the first week of ownership. Each line is our summary of one commenter's claim, linked to the original. We record what they said, including where it contradicts the spec sheet.
EcoFlow DELTA 2 Max
74 claims from 55 comments · 60 from owners · 20 with figures
- Runtime
- 13 · 0% negative
- Solar input
- 10 · 20% negative
- Price & value
- 11 · 45% negative
- Expandability
- 8 · 15% negative
- Noise
- 5 · 58% negative
What owners complain about
Its own MPPT is limited to a mere 60 VOC from solar panels.
Solar inputmeasuredowner19 agreedsource →
Delta 2 Max is promised at 30 dB but measured 42 dB in his hands.
Noisemeasuredowner5 agreedsource →
Got a 5kWh rival for less than he paid for a DELTA 2 Max with extra battery.
Price & valueowner17 agreedsource →
What owners praise
Feeding his lead-acid UPS from it stretches desktop runtime from 8 minutes to 4 hours.
Runtimemeasuredowner8 agreedsource →
Bought the Delta 2 Max for $899 on Black Friday; the Delta 2 was $399.
Price & valuemeasuredowner21 agreedsource →
Takes 500-1000W from a DIY 48V bank over XT60i, far cheaper than the official spare battery.
Expandabilitymeasuredowner19 agreedsource →
Anker SOLIX C1000
85 claims from 55 comments · 60 from owners · 21 with figures
- Price & value
- 16 · 6% negative
- Runtime
- 10 · 20% negative
- Solar input
- 12 · 43% negative
- Warranty & support
- 8 · 23% negative
- Charging
- 4 · 5% negative
What owners complain about
Has to add a Victron controller to each Anker station, adding cost and complexity.
Solar inputowner44 agreedsource →
Dropped to 87% after about three hours running only a lamp, then to 70% the next night.
Runtimemeasuredowner3 agreedsource →
Having handled both, calls the Anker app a complete joke next to the EcoFlow app.
App & firmwareowner2 agreedsource →
What owners praise
Bought the C1000 for $488 and calls it one of his best investments living off grid.
Price & valuemeasuredowner72 agreedsource →
Ultra fast charging at 1300-1400W was left out of the review chart.
Chargingmeasuredowner198 agreedsource →
C1000 app showed 440-473W from a 450W panel and 80W under full cloud.
Solar inputmeasuredowner20 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 2 Max if you…
- →You're buying for the outage specifically, a fridge and the lights through an eight-hour night. The DELTA 2 Max finishes that scenario with 96Wh to spare and the SOLIX C1000 gets a little over half way.
- →Your heaviest appliance is a pump, compressor or saw rated above roughly 1,200W. 2,400W continuous behind a 4,800W peak absorbs a 2-3x startup that the SOLIX C1000's 2,400W ceiling may not.
- →You already own, or will buy, a serious solar array. 1,000W of input is worth paying for once there's 1,000W of panel to plug into it.
- →The unit is going to live in one place, a closet, a garage shelf, beside the desk, where 50.7 lbs is a one-time problem rather than a weekly one.
Buy the SOLIX C1000 if you…
- →You'll be the one carrying it. 28.4 lbs into the trunk, out at the campsite, back in at dusk, without recruiting anybody.
- →Your honest load list sits under about 900Wh a day: laptops, phones, lights, a CPAP at 40W a night, a tailgate's worth of blender and speakers.
- →You want a desk-side UPS. A transfer time rated no worse than 20ms, plus a month of real outages behind it in our ledgerB2, covers the save-your-work case for $449.
- →You want the cheapest route to a five-year warranty and at least 3,000 cycles. Both units carry exactly that; the SOLIX C1000 charges less for it.
If neither fits
Anyone whose real day looks like the van-life row, 4,685Wh, which leaves the DELTA 2 Max 2,944Wh short and the SOLIX C1000 3,787Wh short, or a full 2,100Wh camping weekend that neither one finishes. Those buyers want a station bigger than either of these, or a small unit paired with enough panel to refill it at midday. Buying the DELTA 2 Max because it's the big one on this page is how people end up disappointed by a unit that did nothing wrong.
The Bottom Line
Take the SOLIX C1000. It matches the DELTA 2 Max on warranty, cycle rating, AC outlet count, USB-C output and transfer time, costs $600 less, and weighs 22.3 lbs less every time you pick it up. The one thing the DELTA 2 Max does that it can't is finish an eight-hour outage, and it finishes that with 96Wh of its 1,741Wh usable left. A win, but a narrow one, with the next scenario up already out of reach for both.
So the honest version of this page is short. If you're buying insurance against a long evening without power, or you're starting a motor above about 1,200W, buy the DELTA 2 Max and don't feel bad about the price. It's twice the unit and priced like it. For everyone else the SOLIX C1000 is the same five years of warranty and the same cycle life in a box you can carry one-armed, and the $600 you didn't spend goes further toward panels than toward reserve capacity you'll watch sit at 62% all weekend.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Is the EcoFlow DELTA 2 Max worth more than twice the price of the Anker SOLIX C1000?
Only if you need the capacity for a specific job. It holds 2,048Wh against 1,056Wh, so you're paying $600 more for 992Wh more, and across the scenarios modelled here that extra battery changes the outcome exactly once: an 8-hour blackout needing 1,645Wh, which the DELTA 2 Max finishes and the SOLIX C1000 doesn't. Everything smaller on the list, the SOLIX C1000 does for $449.
Will the Anker SOLIX C1000 run a refrigerator during a power outage?
Run it yes, run it all night no. The blackout scenario here peaks at 150W and totals 1,645Wh across eight hours, which sits comfortably inside the SOLIX C1000's 1,800W continuous rating but well past its 898Wh of usable energy, so it covers a little over half the night. The DELTA 2 Max covers the whole thing with 96Wh left.
Which one is quieter, the DELTA 2 Max or the SOLIX C1000?
Nobody can tell you that from the spec sheets. The DELTA 2 Max lists 30dB, which is a best-case floor rather than a measurement, and Anker publishes no figure for the SOLIX C1000 at all. What coverage exists says both are quiet at low load and audible when fast-charging or running near their limits, so for a 40W CPAP at the bedside neither is likely to wake you.
Can I buy the SOLIX C1000 now and add a battery later instead of the DELTA 2 Max?
Yes. Both units take their maker's expansion batteries, so either one can grow past its base capacity. The thing to plan for is refilling the bigger bank: the SOLIX C1000 accepts 600W of solar and the DELTA 2 Max 1,000W, and that ceiling doesn't move when you add capacity behind it. If the end state is a large off-grid bank, the DELTA 2 Max's input is the part worth paying for.
Do either of these work as a UPS for a desktop computer?
Both are rated to switch over in no worse than 20ms, quick enough that a desktop or a NAS never notices. Our ledger has a month of that in practice on the SOLIX C1000: seven brief outages across 30 days with no shutdowns and no lost data. For the DELTA 2 Max the coverage stops at six months of use with no degradation, so treat them as equal on paper and give the SOLIX C1000 the nod on evidence.
Where to buy
EcoFlow DELTA 2 Max
$1,049.00
$1,049.00 · direct from EcoFlow
Last checked 16 days ago. Prices move — check before you buy.
Anker SOLIX C1000Pick
Sold on Amazon · today’s price is on the listing
Prices may vary by retailer and are subject to change.