Head-to-head test
EcoFlow DELTA 3 1500 vs Anker SOLIX C1000 Gen 2
One of these two can't be bought any more, so the page comes down to a single question: does 1,024Wh cover your day, or do you need the 1,536Wh the retired unit carried?
Full profiles: EcoFlow DELTA 3 1500 → · Anker SOLIX C1000 Gen 2 →
Written by Ian SchneiderUpdated
Solar & Off-Grid Tester, Station Arena Test Desk
Spec deltas
EcoFlow has folded the DELTA 3 1500 out of its range, so this page now has exactly one buyable side. The SOLIX C1000 Gen 2 wins by default, which would be a dull verdict if the default weren't also the unit that's 11.1 lbs lighter (24.9 against 36), rated for 1,000 more cycles, and fed by 600W of solar input against 500W.
What you give up is real, and it's 512Wh. The 1500 carried 1,536Wh against the C1000 Gen 2's 1,024Wh, and after the flat 15% conversion allowance applied to every unit here, that's 1,306Wh usable against 870Wh. One row on this page turns on it: the remote-workday profile needs 910Wh, and the Anker lands 40Wh under.
If that 512Wh is the part you came for, don't go hunting clearance stock for it. EcoFlow's live answer in this size class is the DELTA 3 Max, and the honest read on leftover 1500 units sits further down this page. Everything else the 1500 did, the Anker does with a bigger continuous inverter and a smaller startup cushion, and that asymmetry is the one thing worth understanding before you buy.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
Capacity
Reviewers clock a full wall recharge at roughly 49 minutes, against 58 to 80 for the original C1000B1, so the deficit only bites in the hours when you can neither plug in nor unfold a panel. The remote-workday row is the case in point: 910Wh of load against 870Wh usable, a 40Wh miss that an hour on an outlet at lunch erases entirely. A night-time blackout with nothing deployed is the case where 436Wh is simply 436Wh you don't have.
SOLIX C1000 Gen 2: 1,024Wh nameplate, 870Wh usable after the flat 15% derate applied to every unit hereDELTA 3 1500: 1,536Wh nameplate, 1,306Wh usable on the same derateSOLIX C1000 Gen 2 accepts up to 600W of solar input
Why it mattersIf your day contains a wall outlet or an hour of sun, buy the Anker and stop thinking about the capacity gap; if it genuinely doesn't, size up instead of settling.
continuous output
That 2,000W rating is enough to run a 1,500W space heater with headroom to spareB3, so the live unit is the better appliance-runner and has 800W less room for a compressor to slam into. Fridges, air conditioners and power tools briefly pull two to three times their rated wattage, and what decides whether a given one starts is the ceiling, not the ratio. Nothing in the six profiles modelled here peaks above 400W, so the cushion only matters if you're starting a motor on top of something already large.
SOLIX C1000 Gen 2: 2,000W continuous, 3,000W peak (a 1.5x ratio)DELTA 3 1500: 1,800W continuous, 3,600W peak (a 2x ratio)The heaviest startup draw in any of the six scenarios on this page is 400W, at the tailgate
Why it mattersCheck the startup draw of your heaviest motor against 3,000W before you buy; if your big loads are resistive, like a heater, a kettle or a hot plate, the Anker is the stronger of the two.
rated cycles
Both cycle counts are rated minimums, and neither pack dies when it reaches one. It drops to roughly 80% of original capacity and keeps working, which turns the difference between 11 years and 8.2 into a difference in what the unit weighs in kWh in the mid-2030s. That makes cycle life the least urgent number on this page, and it's the one the Anker wins.
SOLIX C1000 Gen 2: 4,000 rated cycles against the DELTA 3 1500's 3,000Rated lifetime energy: 4,096 kWh against 4,608 kWhAt daily cycling that works out to 11 years against 8.2
Why it mattersNobody should pick between these two on cycle life: if you're cycling daily for a decade the Anker is the one still standing, and everyone else should decide on capacity and weight.
Now add the thinnest evidence base on either side of this page. Our research found no Reddit, YouTube or Amazon material specific to the 1500, and the forum threads that discuss it wouldn't load for direct captureA0; what surfaced was a secondhand account of one owner going through three units in roughly eight monthsA1 and a forum read that the DELTA 3 line drew more failure reports than the DELTA 2 before itA2. Discounted refurbished stock is the one configuration on this page where you are the support plan.
The DELTA 3 1500 is out of EcoFlow's range, and EcoFlow sells nothing else at 1,536WhEcoFlow offers no parts or service out of warrantyField data specific to this SKU is thin and secondhandA0, and what exists leans negativeA1A2
Why it mattersIf you're looking at clearance or refurb 1500 stock, buy it only at a price you'd still be happy with if you end up owning the repair risk yourself.
The specific dimensions that decide these two units — everything else is a tie.
Your Life, Your Pick
Selected because: The six load profiles are where 870Wh usable against 1,306Wh stops being a spec and starts being a night.
The retired unit takes two of the six rows, and you can't act on either. It wins the remote workday by 40Wh and the tailgate on reserve it never uses, since game day asks 670Wh and peaks at 400W and both inverters coast through it. On a page with two buyable stations those rows would separate the units; here they separate a station from a ghost.
Read the three neither rows as sizing advice rather than failure. Weekend camping wants 2,100Wh and van life 4,685Wh, both of which are a larger class of station for either unit. The row that deserves your attention is the 8-hour blackout at 1,645Wh, where the C1000 Gen 2 covers about 53% on a single charge: the fix isn't a bigger number on the box, it's a way to put energy back in during the outage, and 600W of solar input is the one the Anker hands you.
What the Specs Don't Tell You
Selected because: These two don't share a surge convention, and the 2,000W-versus-3,000W split decides what will actually start.
rated cycles
Two units, two different ideas of what an inverter is for. The Anker runs 2,000W continuously and peaks at 3,000W; the 1500 ran 1,800W and peaked at 3,600W. The live unit is the better appliance-runner and the worse motor-starter, and there's no longer a way to buy both.
The other cards are quieter but not empty. Both carry five years of cover, which is a wash on paper and a different question once one of the two makers has stopped selling the unit, and the warranty card takes that up. The UPS ratings differ by class rather than by stopwatch: ≤10ms against ≤15ms, both of them ceilings a maker publishes, not results anyone measured. And only one of the two publishes a noise figure at all, which isn't evidence the 1500 was louder. It's an absence you can't test around.
Portability & Form Factor
Selected because: 24.9 lbs against 36 lbs is the difference the tailgate row rewards, twice, across a parking lot.
weight
24.9 lbs is the number that decides where this thing ends up living. It's a one-hand grab out of a trunk, up basement stairs, over a tailgate, and back again at the end of the day. The 1500's 36 lbs was still a one-person lift, but 11.1 lbs is the difference between taking the unit along without thinking and deciding whether the trip justifies it.
The lighter box is also the easier one to feed, at 600W of solar input against 500W. That combination is the whole argument for a 1 kWh station over a 1.5 kWh one: you carry less, you refill faster, and you accept that the day needs a plan.
Brand Trust
Selected because: One of these two has left its maker's range, which is a brand fact before it's a spec one.
EcoFlow runs the largest range in portable power, and this page is what the churn looks like from the buyer's side. The 1500 is out of the catalogue, and EcoFlow offers no parts or service out of warranty, so support on a discontinued EcoFlow ends on a date rather than tapering. That's not a verdict on the hardware. It's the risk you inherit when you buy the model a maker has moved on from.
Anker's side isn't spotless either, and the catch belongs here rather than in a footnote. SOLIX support has been sliding from the no-hassle replacements the parent brand built its name on, heavy units ship back under hazmat rules, and firmware updates have removed features without warning. What you're buying is a currently supported unit from a company whose support is getting worse, which still beats a well-supported company that no longer sells yours.
Strengths & trade-offs
EcoFlow DELTA 3 1500
Strengths
- +Larger battery capacity
Trade-offs
- –Significantly heavier (+11.1 lbs), making it harder to move.
- –Shorter-lived battery — rated for 3,000 charge cycles vs the SOLIX C1000 Gen 2's 4,000, so it wears out sooner.
Anker SOLIX C1000 Gen 2
Strengths
- +Lighter by 11.1 lb
- +Higher AC output
- +Faster solar charging
- +Rated for 4,000 charge cycles — much longer battery lifespan
Trade-offs
- –No major technical downsides compared to rival.
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 covers this scenario's 2,100Wh: the DELTA 3 1500 comes up 794Wh short (about 62% covered), the SOLIX C1000 Gen 2 1,230Wh (41%). Treat this as partial cover — enough for the essentials in it, not the whole list.
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
Neither unit
Neither unit covers the full 1,645Wh list, which is normal at this size rather than a failure. The 1500 gets about 79% of the way, the C1000 Gen 2 about 53%, and in both cases the plan is the same: the fridge and the router, not the house. The live unit's answer to the shortfall is 600W of solar input, which turns a half-covered outage into a rolling one as long as the sun comes up.
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
Eight hours of CPAP is about 320Wh, so both clear the night barely dented and capacity decides nothing at all. What should decide it is the fan sitting an arm's length from your head, and only the SOLIX C1000 Gen 2 publishes a number there: 35dB, a spec-sheet floor measured at low load. The DELTA 3 1500 publishes nothing, which isn't a mark against it so much as something you can't check until you're lying next to it.
Battery budget usedlower = more headroom
LOAD CPAP Machine 40W×8h
SCN-04 · 8 hours · needs 910Wh
Remote Workday
Full work day off-grid without power anxiety
DELTA 3 1500
The DELTA 3 1500 takes this row, and it's a 40Wh win you can't buy. The profile needs 910Wh and the Anker holds 870Wh usable after the flat 15% conversion allowance; its 1,024Wh nameplate would have cleared it outright. Drop one appliance across the day, or put it on an outlet over lunch, and the row stops mattering.
Battery budget usedlower = more headroom
LOAD Laptop 60W×8h · External Monitor 30W×8h · Router + Modem 20W×8h · Phone Charger 15W×2h
SCN-05 · 4 hours · needs 670Wh
Tailgate Party
Game day power for the crew
DELTA 3 1500
Both units coast here. Game day asks 670Wh and peaks at 400W, which neither inverter notices, and the 1500's larger reserve is reserve nobody uses at a tailgate. What you will feel is the walk from the car: 24.9 lbs against 36 lbs, across a parking lot, twice.
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 3 1500 comes up 3,379Wh short (about 28% covered), the SOLIX C1000 Gen 2 3,815Wh (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 3 1500 runs 6.4h vs 4.2h.
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 0–87hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–17.4hHigh-Draw Appliances
These reveal the real limitsscale 0–1.3h¹ 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 SOLIX C1000 Gen 2
Buy the SOLIX C1000 Gen 2. It's the only one of the two you can still buy new, and it holds the spot on its own terms: 2,000W continuous, 4,000 rated cycles, 24.9 lbs, a ≤10ms UPS rating and 600W of solar input. Go in knowing it's a 1 kWh unit. After the flat 15% conversion allowance this site applies to every station, it has 870Wh usable, which covers a 320Wh CPAP night with 550Wh still in the tank but lands 40Wh under the 910Wh remote-workday profile and gets about 53% of the way through an 8-hour blackout. If your loads genuinely need the 1,536Wh the DELTA 3 1500 carried, the live EcoFlow to start from is the DELTA 3 Max, not clearance stock of a model that's out of the catalogue.
Editor-assigned confidence, based on cited owner research and spec analysis.
List prices as of September 19, 2026. The links below open Anker's current price.
$549.99 · direct from Anker
Last checked 16 days ago. Prices move — check before you buy.
Written by Ian Schneider, Solar & Off-Grid Tester · Station Arena Test Desk · Updated September 19, 2026
Black Friday · 38 days out
Price to beat:SOLIX C1000 Gen 2 $530
We have never seen it discounted, so any real cut would be a first.
Measured Data
Benchmark scores and the full spec record, side by side.
Benchmark scores
Full specifications
ᵈ Derived: price ÷ rated capacity. See the data behind our comparisons →
Comparison ToolAdd more power stations, side by sideOpen Tool →How these numbers are produced
Numeric verification
Every figure on this page traces to our spec database or arithmetic on it — no estimated numbers.
Owner claims
Statements about owner experience are cited to published reviews — see Sources & Research Notes below.
Runtime model
Runtime = (rated capacity × 0.85 inverter efficiency) ÷ device wattage. Solar recharge estimates assume panels deliver 70% of rated output. Cold weather, battery age, and stacked loads reduce real-world results.
Power Score
Computed from 14 published spec dimensions, weighted per use-case bench. Higher is better; a unit must meet a bench's minimum threshold to be rated.
See the full weight table and data sourcing on our methodology page →Class ranking (the star rating)
Each unit's star score is a category ranking, not customer reviews — no buyer opinions feed it. We score every station on size-independent quality (value, output, portability, endurance, ports, warranty, and more), then percentile-rank it against the other units in its capacity class, so a class-leading compact unit and a class-leading whole-home unit can both earn 5★. Here, DELTA 3 1500 rates 5.0/5 (99th percentile of 27 Everyday-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.
Surge: The Bigger Inverter Has the Smaller Cushion
The unit you can buy is the stronger one at steady state and the weaker one the moment a motor starts. The SOLIX C1000 Gen 2 runs 2,000W continuously and peaks at 3,000W, leaving 1,000W of startup room above its own rating. The DELTA 3 1500 ran 1,800W and peaked at 3,600W, which is 1,800W of room. That's the honest catch on the live pick: it handles the bigger resistive load and has 800W less headroom to absorb a compressor landing on top of it. What decides whether a given motor starts is the ceiling rather than the ratio, so check the startup draw of your heaviest appliance against 3,000W. For scale, nothing in the six scenarios on this page peaks above 400W.
UPS Switchover: ≤10ms vs ≤15ms
Both list a UPS mode, at different rated speeds. 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. The DELTA 3 1500 is rated ≤15ms — fine on paper for routers and most electronics; the fussiest PC power supplies sit right at this line. If a computer with unsaved work is the thing being protected, the stated class is worth the attention; nothing here is a lab result.
Warranty: Same Five Years, Different Futures
Both units carry a 5-year term, so on paper the cover is a wash. What differs is what stands behind the term. The SOLIX C1000 Gen 2 is a current model from a company still selling it, so a claim runs against a live supply of parts and replacements. The DELTA 3 1500 has left EcoFlow's range, and EcoFlow offers no parts or service out of warranty at all, so its support ends on a date instead of tapering off. Same five years, and only one of them is followed by anything.
Battery Lifespan in Real Years
The SOLIX C1000 Gen 2 is rated for 4,000 cycles vs 3,000. In real life: at daily use, that's 11 vs 8.2 years. At weekend use (twice a week), it's 38 vs 29 years. One caution reading years across different sizes: a cycle is 1,024Wh on the SOLIX C1000 Gen 2 and 1,536Wh on the DELTA 3 1500, so count lifetime energy — roughly 4,096 kWh against 4,608 kWh over the rated life. After hitting the cycle limit, the battery doesn't die — it drops to ~80% of original capacity, which is still very usable.
DELTA 3 1500: Noise Level Not Disclosed
The SOLIX C1000 Gen 2 publishes its noise level (35dB); the DELTA 3 1500 doesn't publish one. That isn't evidence the DELTA 3 1500 is louder — it means there's no figure to hold it to, and no way to compare the two on this without hearing them. If you're buying for a bedroom, a CPAP, or an apartment, treat the SOLIX C1000 Gen 2's 35dB as the only published number on the table — a spec-sheet figure, not a measurement — and look for hands-on reports of the DELTA 3 1500 before deciding.
Full record above — the Test Desk pick is the SOLIX C1000 Gen 2.
Check SOLIX C1000 Gen 2 price →Ownership 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 DELTA 3 1500 is no longer sold, so there is no price to work its cost per kWh from, and this comparison doesn't quote one. On what you can actually buy today, the SOLIX C1000 Gen 2 works out at $0.13/kWh over its rated life. If you already own the DELTA 3 1500, the hardware comparison still holds: over its rated life the DELTA 3 1500 delivers about 4,608 kWh and the SOLIX C1000 Gen 2 about 4,096 kWh. 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 3 1500 still delivers more over its shorter horizon. 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 runs the largest range in portable power, and it prunes that range accordingly. The DELTA 3 1500 is what that looks like from the buyer's side: a model out of the catalogue, with no parts or service offered once the warranty term ends.
Anker
Ecosystem
7-8 SOLIX portable power stations across C-series (compact) and F-series (flagship), plus the X1 home energy system
Support
US-based support. Historically known for incredible no-hassle replacements, but recent reports describe AI-driven support agents giving generic responses and complex return logistics for heavy units (hazmat shipping). The Anker brand reputation is still strong, but SOLIX-specific support quality is trending down.
Community
Moderate — active Reddit (r/Anker, r/AnkerSOLIXCommunity) and growing. Benefits from Anker's massive consumer electronics brand awareness.
App experience
Rated 4.5/5 iOS (~1,100 ratings) · 4.3/5 Android
Unique strength
Parent brand trust from Anker's consumer electronics dominance. InfiniPower technology for long cycle life. Strong $/Wh value in the mid-size and larger units — the S2000, F2600 and C1000 are among the better buys per watt-hour in the catalog.
Worth knowing
Anker's SOLIX support has been sliding from the no-hassle replacements the parent brand built its name on, heavy units return under hazmat shipping rules, and firmware updates have removed features without warning. The expansion ecosystem is smaller than EcoFlow's too.
Analyst note
One of these brands still sells the unit on this page and one doesn't, which outranks every other brand fact here. Anker's support is getting worse and is still the support you'd rather be holding, because EcoFlow's best service story doesn't cover a model it has stopped selling.
Growth path
DELTA 3 1500
EXPANDABLESupports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 1,536Wh.
Accepts up to 500W of solar. Suitable for a 1-2 panel setup.
Generous port selection supports complex multi-device setups.
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
Growth only counts if you can still buy in, and the DELTA 3 1500 is no longer sold (EcoFlow points owners to the DELTA 3 Max). That leaves the SOLIX C1000 Gen 2: it starts at 1,024Wh and takes Anker expansion batteries, so the ceiling moves if your needs do. The DELTA 3 1500's expandability still matters if you already own one, but it isn't a reason to pick it over the SOLIX C1000 Gen 2.
What Owners Report
Patterns from published owner reports and long-term reviews — every claim cited to its source below.
EcoFlow DELTA 3 1500
Start with what isn't there. Our research turned up no Reddit, YouTube or Amazon material specific to the 1,536Wh 1500, and the two forum threads that do discuss it wouldn't load for direct capture, so what follows is paraphrase of indexed snippets rather than testimonyA0. For a unit that has now left the range, that thinness is part of the answer.
What exists leans cautious. One poster described a neighbor going through three 1500s in roughly eight monthsA1, and the forum read was that the DELTA 3 line drew more failure reports than the DELTA 2 it followedA2. Posters characterized the 1500 as a hybrid, DELTA 2 cutover electronics in a new caseA3, and put its UPS cutover at the 15ms mark against the sub-10ms they credited to the standard DELTA 3A5. Idle draw came up again and again without resolution, cited at roughly 25-30W with a claimed firmware fix from about 40W to 17W that nobody could confirm had reached the 1500A4. Take that last one as character rather than spec; our researcher couldn't confirm which model the thread was describing.
“Posters described the Delta 3 1500 as essentially a Delta 2/Delta 3 hybrid — UPS-cutover electronics carried over from the Delta 2, housed in a new case with what one called "larger grade B cells."”
Sources
diysolarforum.com
Anker SOLIX C1000 Gen 2
Coverage on the C1000 Gen 2 is strong and consistentB0, and the praise is specific rather than general. A full recharge lands in roughly 49 minutes against 58 to 80 minutes for the original C1000B1, and the higher continuous output crosses a threshold that matters, running a 1,500W space heater with headroom left overB3. Reviewers widely rate it the mid-size unit to beat this yearB4.
The complaint is just as consistent, and it's the fans. Near silent at low load, around 35dB under 200W, then audibly louder during fast charging or heavy output, around 55dB once you're past 1,000WB2. Fast charging and quiet are the same fans. You pick one at a time.
“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
- Forum posters flagged the Delta 3 1500 as less reliable than EcoFlow's earlier Delta 2, both from direct failure reports and from its unusual hybrid Delta 2/Delta 3 hardware platform. [DELTA 3 1500 · 3 entries]
- Idle power draw and UPS cutover time are both discussed as possible regressions or open questions relative to the standard Delta 3 / Delta 3 Plus, without firm confirmation for the 1500 variant specifically. [DELTA 3 1500 · 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
“A poster's neighbor had three separate Delta 3 1500 units fail on him over roughly eight months.”
diysolarforum.com — "Ecoflow Delta 3 1500 (the newer one), refurbed from EF for $360pt, shipped free" · 2026-02 · [negative]
- A2
“Forum consensus leaned toward the Delta 3 line seeing more failure reports than the Delta 2 — one poster said their two Delta 2 units never gave them a single issue by comparison.”
diysolarforum.com — "Ecoflow Delta 3 1500 (the newer one), refurbed from EF for $360pt, shipped free" · 2026-02 · [negative]
- A3
“Posters described the Delta 3 1500 as essentially a Delta 2/Delta 3 hybrid — UPS-cutover electronics carried over from the Delta 2, housed in a new case with what one called "larger grade B cells."”
diysolarforum.com — "Ecoflow Delta 3 1500 (the newer one), refurbed from EF for $360pt, shipped free" · 2026-02 · [mixed]
- A4
“Idle power draw for the Delta 3 line was debated — some cite roughly 25-30W, others said a firmware update cut it from about 40W to 17W — and posters weren't sure whether the 1500 specifically had received that fix.”
diysolarforum.com — "EcoFlow Delta 3 1500? Any user experiences" and "...refurbed from EF for $360pt" threads · 2026-02 to 2026-03 · [mixed]
- A5
“The Delta 3 1500's UPS cutover was pegged at 15ms in forum discussion, versus a sub-10ms cutover reported for the standard Delta 3 and Delta 3 Plus.”
diysolarforum.com — "EcoFlow Delta 3 1500? Any user experiences" · 2026-03 · [mixed]
- 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.
Who Should Buy Which
Buy the DELTA 3 1500 if you…
- →You already own a DELTA 3 1500: nothing on this page is a reason to replace it. 1,536Wh and a 3,600W peak are still 1,536Wh and a 3,600W peak, and the pack is rated for 3,000 cycles you almost certainly haven't finished.
- →You've found retailer or refurbished stock and want to know whether it's a bargain: it can be, at the right discount, but read the warranty card first. Cover ends where the term does, and the field record on this exact SKU is thin enough that you're buying on the spec sheet aloneA0.
Buy the SOLIX C1000 Gen 2 if you…
- →You want the lightest box that still runs a 1,500W space heaterB3: 24.9 lbs, 2,000W continuous, and it's the only one of the two with a checkout button.
- →You're powering a CPAP: a 320Wh night leaves 550Wh untouched, and this is the only unit here that publishes a noise figure at low load at all.
- →You work off it during the day and can reach an outlet or unfold a panel at some point: 870Wh usable plus 600W of solar input covers a workday that 870Wh on its own misses by 40Wh.
- →You want the unit still standing in a decade: 4,000 rated cycles, about 11 years of daily cycling, and it only drops to roughly 80% capacity from there.
If neither fits
Van lifers and anyone planning to ride out a long outage on one box should close this tab. The van profile asks 4,685Wh a day and a camping weekend 2,100Wh, and neither unit covers either, with the C1000 Gen 2 reaching 19% and 41% of them. That's a larger class of station than either of these, or two of these, and the shopping starts a tier up rather than here. If instead it's the 1500's 1,536Wh you were after, the DELTA 3 Max is the live EcoFlow to start from.
The Bottom Line
Take the SOLIX C1000 Gen 2. It's the only one of these two you can buy, and it earns the spot anyway on 2,000W continuous, 4,000 rated cycles, 24.9 lbs and 600W of solar input to feed it. What you're accepting is 870Wh usable instead of 1,306Wh, and the entire page comes down to whether your day has an hour of sun or a wall outlet in it. If it does, the gap closes by lunchtime. If it doesn't, you want a bigger station rather than this one.
The DELTA 3 1500 isn't a bad unit, it's an unbuyable one, and that's a different problem with a different answer. Its 3,600W peak was the better motor-starter and its 1,536Wh the bigger tank, and neither of those facts comes with a checkout button attached. If the size is what you came here for, go look at the DELTA 3 Max. If 1 kWh is enough, the Anker is sitting right there at $530.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Is the EcoFlow DELTA 3 1500 discontinued?
Yes. EcoFlow has folded it out of its range, which is why this page shows no price and no buy button for it. The nearest live EcoFlow is the DELTA 3 Max. Retailer or refurbished stock still works exactly as specified, but you're buying a model the maker has moved on from, and EcoFlow offers no parts or service out of warranty.
Is the Anker SOLIX C1000 Gen 2 enough for a power outage?
For an evening, yes. For a full day, plan on recharging. The 8-hour blackout profile on this page needs 1,645Wh, and the C1000 Gen 2 holds 870Wh usable after the flat 15% conversion allowance, so it covers about 53% of that list on one charge. It takes 600W of solar input, which is the difference between a half-covered outage and a rolling one.
Can the SOLIX C1000 Gen 2 run a fridge or a space heater?
A 1,500W space heater, yes, with headroom to spare. A fridge depends on its startup draw rather than its running draw. The inverter runs 2,000W continuously and peaks at 3,000W, and compressors briefly pull two to three times their rated wattage, so check the startup figure of yours against 3,000W, especially if something else large is already running.
Which one is quieter, the DELTA 3 1500 or the C1000 Gen 2?
Only one of them answers the question. The C1000 Gen 2 publishes 35dB, a spec-sheet figure taken at low load rather than a promise it holds under everything, and its fans ramp up audibly during fast charging or heavy output, around 55dB past 1,000W. The DELTA 3 1500 publishes no figure at all, so there's nothing to hold it to and no way to compare the two without hearing them.
Should I buy leftover DELTA 3 1500 stock instead?
Only at a discount you'd still accept if you end up being the support plan. The unit itself is fine on paper, with 1,536Wh, 1,800W continuous and a 3,600W peak, but EcoFlow no longer sells it and offers no parts or service once the 5-year term ends. Independent field data on this SKU is thin and secondhand, and what there is runs to a secondhand account of three failures inside about eight months and a sense that the DELTA 3 line drew more failure reports than the DELTA 2.
Where to buy
EcoFlow DELTA 3 1500
No longer sold
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.