Head-to-head test
EcoFlow DELTA 3 vs Anker SOLIX C1000
The price has flipped: the Anker SOLIX C1000 now undercuts the EcoFlow DELTA 3 by $100, and it already answered with a slightly bigger battery, more solar, and a documented year-long track record. The DELTA 3 counters with a much higher surge, a faster UPS, and a quieter, disclosed noise rating. For most buyers, the cheaper, proven Anker is now the better ~1kWh pick — though the DELTA stays the one for high-surge or bedside use.
Written by Ian SchneiderUpdated
Solar & Off-Grid Tester, Station Arena Test Desk
EcoFlow
DELTA 3
3,196Power Score · Appliance Class
$549.00 list · direct from EcoFlow
Anker
SOLIX C1000
3,269Power Score · Appliance Class
$449.00 list · direct from Anker
Spec deltas
Two ~1kWh units that used to sit thirty dollars apart now sit a hundred apart — the other way. The Anker SOLIX C1000 is $449; the EcoFlow DELTA 3 is $549. They still share an 1,800W inverter, 3,000 cycles, a 5-year warranty, and expandability.
That price swing reverses the value story. With both at 3,000 cycles, the cheaper Anker is now cheaper to own too — about $0.14 per lifetime kWh against the DELTA's $0.18, where the two used to tie. The Anker also holds a slightly bigger battery (1,056 vs 1,024Wh), takes a bit more solar (600W vs 500W), and brings something the newer DELTA can't: a documented year of real use at 97% capacity with no failuresB2.
The DELTA 3's answers are real, and they're about capability, not price. It surges to 3,600W (a 2.0x ratio) against the Anker's 2,400W (1.33x), switches over as a UPS in 10ms versus 20ms, weighs a touch less, and publishes a 30dB rating that reviewers confirm stays effectively silent under light loadA1. For high-surge or bedside use it's still the better unit; for most buyers, the cheaper, proven Anker now wins.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
Price
The DELTA 3 costs $100 more, yet its case is capability: it surges to 3,600W (2.0x) against the Anker's 2,400W (1.33x) and switches over in 10ms to the Anker's 20ms — better at starting motor loads and steadier as a UPS, but no longer the cheaper way to get there.
the Anker C1000 is now $449 vs the DELTA 3's $549the DELTA surges to 3,600W (2.0x) vs the Anker's 2,400W (1.33x)the DELTA switches over in 10ms vs the Anker's 20ms
Why it mattersFor running a fridge or protecting sensitive gear the DELTA is more capable; for everyone else, the $100 saved on the Anker is the stronger argument.
solar input
The Anker C1000 holds a slightly bigger battery (1,056 vs 1,024Wh), takes a bit more solar (600W vs 500W), and — its strongest card — has a documented year at 97% of original capacity riding out seven outages without a failureB2, all while costing $100 less than the DELTA.
the Anker holds 1,056Wh vs the DELTA's 1,024Wh (+32Wh)the Anker takes 600W of solar vs the DELTA's 500Wone reviewer ran the Anker for over a year at 97% capacity, riding out 7 outagesB2
Why it mattersFor buyers who want a proven, roomier unit for less, the Anker is now the easy call; the newer DELTA 3 hasn't earned that history yet.
The DELTA 3 publishes a 30dB rating and reviewers confirm its fans stay off under light loadA1; the Anker doesn't disclose a noise figure, and reviewers note its fans spin up audibly, like a desktop fan, during fast charging or heavy outputB1 — quiet under ~500W, but louder when pushed.
the DELTA 3 publishes a 30dB rating, fans off under ~200WA1the Anker doesn't disclose a noise spec; its fans spin up audibly under fast charging or heavy loadB1both are near-silent under ~500W
Why it mattersFor a bedside unit, the DELTA's transparency and steady quiet are worth the extra $100; both are fine at light overnight loads.
Capacity
Both are roughly 1,024-1,056Wh, which a single 8-hour blackout overruns (needs 1,645Wh) — but both accept expansion batteries, so backup buyers should plan a second pack on either.
both units are roughly 1,024-1,056Wh and both accept expansion batteriesan 8-hour blackout needs 1,645Wh — more than either holdsthe Anker C1000 is now the cheaper base to start from
Why it mattersFor more than a night, budget an expansion battery — and the cheaper Anker is now the better base unless you specifically need the DELTA's surge or disclosed quiet.
The specific dimensions that decide these two units — everything else is a tie.
Lifetime Value
Selected because: The Anker is now cheaper up front and cheaper to own — the value point flips to it.
cost / lifetime kWh
On the money, the tie has broken toward the Anker. Both are ~1kWh at 3,000 cycles, but they no longer cost the same to own: the Anker C1000 works out to about $0.14 per lifetime kWh against the DELTA 3's $0.18, because it's now $100 cheaper up front ($449 vs $549). That also makes it cheaper per warranty year ($90 vs $110).
A hundred dollars is real money at this size, and it comes with the slightly larger battery, not a smaller one. The DELTA 3 isn't overpriced for what it does — it surges harder and switches faster — but it no longer gives most buyers a value reason to choose it over the cheaper, proven Anker.
What the Specs Don't Tell You
Selected because: Surge, UPS speed, and undisclosed noise all favor the DELTA — the real spec-sheet story.
Three things the price tag hides, and they still favor the DELTA 3 — they're now the reasons to pay its premium. Surge: it hits 3,600W (a 2.0x ratio) to the Anker's 2,400W (1.33x), so it's the better bet for starting a fridge or pump whose motor briefly pulls 2-3x its rated watts. UPS: it switches to battery in 10ms versus the Anker's 20ms, a tighter window for sensitive gear.
Noise: the DELTA 3 publishes a 30dB rating and reviewers confirm its fans stay off under light loadA1, while the Anker doesn't disclose a figure at all — and reviewers note its fans spin up audibly, like a desktop fan, during fast charging or heavy output, though it's near-silent under ~500WB1. Both are fine for a quiet overnight load; the DELTA is the one that tells you what to expect, and the one to pick if that matters more than the $100.
Brand Trust
Selected because: Cross-brand: EcoFlow's ecosystem vs Anker's pedigree and proven reliability record.
This is EcoFlow's depth against Anker's pedigree. EcoFlow runs the biggest ecosystem and best app in portable powerA2, with polarized US support. Anker brings its consumer-electronics reputation and genuinely good value — sharpened here by the lower price — plus the C1000's strong reliability record: a year of use at 97% capacity in one long-term testB2.
The watch-item on Anker is that SOLIX-specific support is reportedly slipping from its old no-hassle standard. EcoFlow's ecosystem and expansion path are wider; Anker's appeal is a proven, no-drama unit from a trusted electronics name, now at the lower price. For a ~1kWh unit you'll mostly set and forget, both brands are safe.
Your Life, Your Pick
Selected because: Both ~1kWh clear only light jobs; frames that both need expansion for more.
At ~1kWh, both are one-or-two-device units, not whole-home backups. A CPAP overnight is comfortable at 36-37% of capacity and a tailgate fits at 75-77%, but a full 8-hour blackout (1,645Wh), a remote workday (910Wh), a weekend camp, and van life all overrun both — the Anker's slightly larger battery just nudges each percentage down a point or two.
So scenarios don't really separate them; both need an expansion battery for anything past a couple of devices, and both accept one. For those everyday one-device jobs, the tiebreakers are the Anker's lower price and proven longevity against the DELTA's stronger surge and faster UPS — not raw runtime.
Strengths & trade-offs
EcoFlow DELTA 3
Strengths
- +Lighter by 1.4 lb
Trade-offs
- –No major technical downsides compared to rival.
Anker SOLIX C1000
Strengths
- +Costs $100 less
- +Larger battery capacity
- +Faster solar charging
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
Two nights wants 2,100Wh and these hold ~1kWh, so both overrun hard (241% and 234%). Neither is a weekend battery alone; both add an expansion pack to get there — the Anker now the cheaper base, the DELTA the higher-surge one.
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
A full blackout needs 1,645Wh, well past either unit's ~1kWh, so both fall short. For real coverage, plan an expansion battery on either. If you're starting a fridge mid-outage, the DELTA 3's higher surge is the safer bet.
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 40W CPAP uses about 37% of either overnight, so capacity is fine. At light overnight load both are quiet, but the DELTA 3 publishes its 30dB rating where the Anker doesn't — a small edge if bedside silence is the priority.
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
Neither unit
A full work day edges just past either unit's ~1kWh (105% and 101%), so neither quite lasts on the base alone. Close enough that a small expansion pack or a midday top-up covers it; the Anker takes a bit more solar (600W vs 500W) to do that top-up.
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
Either unit
Game day fits on either at about three-quarters of the battery — the one everyday scenario the base units clear. They're close on capacity; the Anker is now cheaper and holds a touch more, the DELTA surges harder.
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
Not close — a van-life day wants 4,685Wh and these hold ~1kWh, so both bury the needle. That's an expansion-battery-or-bigger-unit job; whichever brand you prefer, plan to scale up.
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 six 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
Dead heat — both run this 205W load for roughly 4.2h. Pick on price, weight, or ports.
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 0–59.8hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–12hHigh-Draw Appliances
These reveal the real limitsscale 0–0.9h¹ 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
July 12, 2026
Verdict: the SOLIX C1000
For most buyers, the Anker SOLIX C1000. It's now $100 cheaper than the EcoFlow DELTA 3 ($449 vs $549), and with both rated for 3,000 cycles it's also cheaper to own ($0.14 vs $0.18 per lifetime kWh) — a gap that used to be a tie. It adds a slightly bigger battery (1,056 vs 1,024Wh) and more solar (600W vs 500W), and carries its strongest card: a documented year of use at 97% capacity with no outage failuresB2. The DELTA 3 still out-specs it on surge (3,600W/2.0x vs 2,400W/1.33x), UPS speed (10ms vs 20ms), weight, and a disclosed 30dB that stays effectively silent under light loadA1 — so it's the pick if you'll start motor loads, want a proven-quiet bedside unit, or live in EcoFlow's ecosystem. But at $100 less and cheaper to own, the Anker is the better default.
Editor-assigned confidence, based on cited owner research and spec analysis.
List prices as of July 12, 2026. The links below open EcoFlow's and Anker's current prices.
$449.00 list · direct from Anker
or check the DELTA 3 price$549.00 list
Written by Ian Schneider, Solar & Off-Grid Tester · Station Arena Test Desk · Updated July 12, 2026
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 rates 4.3/5 (61st percentile of 24 Everyday-class units), and SOLIX C1000 rates 4.6/5 (74th percentile of 24 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.
The DELTA Starts Tougher Appliances
Both run 1,800W continuous, but the DELTA 3 surges to 3,600W (a 2.0x ratio) against the Anker C1000's 2,400W (1.33x). Motors in fridges, pumps, and power tools briefly pull 2-3x their rated watts at startup, so the DELTA's bigger surge headroom makes it noticeably more likely to start a stubborn compressor without tripping. The Anker's lower surge ceiling is the one spec where it could leave you stuck at the worst moment.
A Faster UPS on the DELTA
The DELTA 3 switches to battery in 10ms against the Anker C1000's 20ms. Both keep a PC or router alive through a grid drop, but the tighter 10ms window is friendlier to very sensitive gear like a NAS. It's a modest edge — and, like the surge, it belongs to the DELTA.
Warranty Value Comparison
The SOLIX C1000 gives you 11.1 years of warranty per $1,000 spent, vs the DELTA 3's 9.1 years. That's 1.2× more coverage per dollar. An underrated factor if you're keeping this unit for years.
One Publishes Its Noise Number, One Doesn't
The DELTA 3 rates itself at 30dB, and reviewers confirm its fans stay off under light load. The Anker C1000 doesn't publish a noise figure — which usually isn't a good sign — and reviewers note its fans can spin up like a desktop computer during fast charging or heavy output, though it's near-silent under about 500W. Both are quiet at a bedside CPAP load; the difference is that the DELTA tells you what to expect and the Anker leaves you to find out.
Full record above — the Test Desk pick is the SOLIX C1000.
Check SOLIX C1000 price →or check the DELTA 3 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 wins on both sticker price and long-term value. At $0.14/kWh over its lifetime, it's meaningfully cheaper to own. Clear value winner.
Brand trust
EcoFlow
Ecosystem
The deepest in portable power — a dozen-plus models across the DELTA and RIVER lines plus solar and smart-home panels, scaling to 180kWh modular systems at the top.
Support
US-based phone, email, and chat. Replacement experiences are polarized: many hassle-free prepaid-label swaps, but also reports of long waits and refurbished units for new claims. Costco or Amazon adds a 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
The best app and fastest charging in the category, plus the widest ecosystem and the most active release pace.
Worth knowing
Note the October 2025 DELTA Max 2000 recall (overheating risk, six incidents), and a brief 2025 experiment with app-feature paywalls that backlash paused. No out-of-warranty parts or service.
Anker
Ecosystem
A focused 7-8 SOLIX stations across compact C-series and flagship F-series, plus the X1 home energy system — smaller than EcoFlow's, but coherent.
Support
US-based, and Anker's consumer-electronics reputation is strong, but SOLIX-specific support is reportedly slipping — AI-driven agents and clunky hazmat return logistics for heavy units.
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 electronics dominance, InfiniPower long-life cells, and some of the best $/Wh value in the market — plus, for the C1000 specifically, a documented year-long reliability record.
Worth knowing
Support quality appears to be declining from its former no-hassle standard, some firmware updates have removed features without warning, and the expansion ecosystem is smaller than EcoFlow's.
Analyst note
EcoFlow sells depth — the biggest ecosystem, the best app, the widest expansion — at a mid-to-premium position. Anker sells focus and value: fewer models, but excellent $/Wh and a plug-and-play simplicity reviewers love, with a proven reliability record on the C1000. If you want software, accessories, and a long expansion runway, EcoFlow. If you want a trusted, no-drama unit that nails the basics, Anker. Both are safe; they just emphasize different things.
Growth path
DELTA 3
EXPANDABLESupports EcoFlow 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 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
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, so neither locks you out of growth — decide on capacity, price, and the rest, not the expansion checkbox.
What Owners Report
Patterns from published owner reports and long-term reviews — every claim cited to its source below.
EcoFlow DELTA 3
Field data on the standard DELTA 3 is thin — most testing goes to its Plus, Max, and Ultra siblings — but the two findings that exist are relevant. Reviewers report the base DELTA 3's fans staying off under about 200W, making it effectively silent, and barely audible at moderate loadA1, with a ~10ms UPS handoff quick enough that routers, fridges, and CPAPs don't skipA2.
That combination — quiet at light load and a fast, reliable UPS — is exactly what a small bedside or desk backup should doA1A2. Long-term reliability is still unproven given how new the unit is, so treat the sentiment as preliminary and, if a documented record matters, weigh the Anker's.
“At low loads (under 200W) the fans often stay completely off, making the Delta 3 effectively silent; under moderate load (500–800W) the fans are barely audible from three feet away.”
Sources
portablepowernerd.com · thesolarlab.com · outputreport.com
Anker SOLIX C1000
The C1000's biggest asset is a track record. One reviewer ran it for over a year with minimal degradation — about 97% of original capacity — and in a 30-day home-office UPS test it rode out seven brief outages with no shutdowns or data lossB2. Reviewers say it nails the fundamentals: fast AC recharge, practical size and weight for 1kWh, and genuinely useful app monitoringB3.
The consistent knock is fan noise: the fans spin up audibly during fast charging or heavy output near the unit's limit, comparable to a desktop fan at speed, though it's nearly silent under about 500WB1. Reviewers still call it a sweet-spot 1kWh unit that handles virtually any household appliance short of central AC or an electric dryerB4.
“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
- 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
“At low loads (under 200W) the fans often stay completely off, making the Delta 3 effectively silent; under moderate load (500–800W) the fans are barely audible from three feet away.”
portablepowernerd.com — EcoFlow Delta 3 Tested: 2026 Hands-On Review; thesolarlab.com · 2026 · [positive]
- A2
“UPS switchover works as advertised — a power cut results in a ~10ms handoff, fast enough that routers don't reset, fridges don't skip a compressor cycle, and CPAP machines don't interrupt therapy.”
outputreport.com / thesolarlab.com — DELTA 3 line UPS testing (observed on DELTA 3 Plus, which shares the 10ms UPS spec) · 2026 · [positive]
- 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 July 12, 2026.
Who Should Buy Which
Buy the DELTA 3 if you…
- →You'll start motor loads or protect sensitive gear — it surges harder (3,600W vs 2,400W) and switches over faster (10ms vs 20ms), and that capability is now what you're paying the extra $100 for.
- →You want a disclosed, genuinely quiet noise profile for a bedside or desk unitA1.
- →You'll pair it with EcoFlow's deeper app and ecosystem, or an expansion batteryA2.
Buy the SOLIX C1000 if you…
- →You want the cheaper unit — $449 to the DELTA's $549, $100 less — that's also cheaper to own ($0.14 vs $0.18 per lifetime kWh).
- →You weight a proven track record heavily — a documented year at 97% capacity with no outage failuresB2.
- →You want the slightly larger battery (1,056 vs 1,024Wh) and a bit more solar (600W vs 500W).
If neither fits
If you need to cover a full 8-hour blackout or a workday from the base unit, ~1kWh isn't enough on either — add an expansion battery or step up to a 2,000Wh-class station. And if you only run small loads, a smaller unit would save money.
The Bottom Line
For most buyers, buy the Anker SOLIX C1000. It's now $100 cheaper than the EcoFlow DELTA 3 ($449 vs $549) and, with both at 3,000 cycles, cheaper to own ($0.14 vs $0.18 per lifetime kWh) — a value gap that used to be a tie. It brings a slightly larger battery, a bit more solar, and its best card: a documented year of real use at 97% capacity with no outage failuresB2.
The DELTA 3 makes its case on capability: a 3,600W surge for starting appliances, a faster 10ms UPS, less weight, and a disclosed 30dB that stays quiet under light loadA1. If you need the surge, the tighter UPS, or a proven-quiet bedside unit — or you're in EcoFlow's ecosystem — it's worth the extra $100. Otherwise, the cheaper, proven Anker is the better ~1kWh buy.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
EcoFlow DELTA 3 or Anker SOLIX C1000 — which should I buy?
For most buyers, the Anker SOLIX C1000. It's now $100 cheaper ($449 vs $549) and, with both at 3,000 cycles, cheaper to own too ($0.14 vs $0.18 per lifetime kWh). It adds a slightly bigger battery, a bit more solar, and a proven year-long reliability record. The DELTA 3 still out-specs it on surge (3,600W vs 2,400W), UPS speed (10ms vs 20ms), and a disclosed 30dB noise rating — pick it if you need the surge or a proven-quiet bedside unit.
Which handles appliances better?
The DELTA 3, thanks to surge headroom. It surges to 3,600W (a 2.0x ratio) versus the Anker's 2,400W (1.33x), so it's more likely to start a fridge or pump whose motor spikes at startup. Both run 1,800W continuous, so for steady loads they're equal — the difference shows up at the moment a motor kicks on.
Are they quiet enough for a bedroom?
At light overnight loads, both are — but only the DELTA 3 publishes a number. It's rated 30dB and reviewers confirm its fans stay off under about 200W. The Anker doesn't disclose a noise spec, and reviewers note its fans spin up audibly during fast charging or heavy output, though it's near-silent under ~500W. For predictable quiet, the DELTA is the safer pick.
Which is more reliable long-term?
The Anker C1000 has the documented edge here: one reviewer ran it for over a year at about 97% of original capacity and through seven outages with no failures. The standard DELTA 3 is newer with less long-term data, though EcoFlow's LFP platform is well-regarded. If a proven multi-year record is your top priority, that's the Anker's strongest argument.
Where to buy
EcoFlow DELTA 3
$549.00
$549.00 list · direct from EcoFlow
Anker SOLIX C1000Pick
$449.00
$449.00 list · direct from Anker
Prices may vary by retailer and are subject to change.