Head-to-head test
EcoFlow DELTA 2 vs Anker SOLIX C1000
At $449 the C1000 is now cheaper than the DELTA 2, with more solar, more capacity, a lower cost-to-own, and a standout reliability record — so the EcoFlow's edge narrows to a higher surge and a slightly lighter body.
Written by Ian SchneiderUpdated
Solar & Off-Grid Tester, Station Arena Test Desk
EcoFlow
DELTA 2
3,128Power Score · Appliance Class
$499.00 list · direct from EcoFlow
Anker
SOLIX C1000
3,269Power Score · Appliance Class
$449.00 list · direct from Anker
Spec deltas
Two proven 1kWh units, closely matched and now closely priced — with the price lead changed hands. The Anker SOLIX C1000 is $449; the EcoFlow DELTA 2 is $499 — and the two share most of what matters: 1,800W output, roughly 1,024-1,056Wh, a 3,000-cycle LFP battery, a 20ms UPS, and expandability.
The C1000's case is now value and solar. It's $50 cheaper, costs less to own at $0.14 per lifetime kWh against $0.16, takes 100W more solar (600W vs 500W), and holds a hair more capacity — all on the same shared core. Its standout, though, is the track record: one reviewer ran it over a year at 97% of original capacity with zero issuesB2.
The DELTA 2 answers with its inverter and body: a higher 2,700W surge against the C1000's 2,400W for starting bigger motors, and about 1.4 lb less weight (27 vs 28.4 lb), plus EcoFlow's app and ecosystem. Both, notably, draw fan-noise complaintsA1B1.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
cost / lifetime kWh
With the same output, cycle life, and roughly the same capacity, the C1000 delivers the core of a 1kWh unit for $50 less and a lower cost-to-own — and its slightly bigger 1,056Wh battery on the same 3,000 cycles is what widens the lifetime-cost gap to $0.14 against $0.16. Dollar for dollar, the C1000 is now the better value.
the C1000 is $449 vs the DELTA 2's $499both share 1,800W output, ~1kWh, and 3,000-cycle LFPthe C1000 costs $0.14 per lifetime kWh vs $0.16
Why it mattersValue-first buyers now lean C1000; the DELTA 2 has to earn its keep on surge and weight.
Both units run 1,800W continuously, but the DELTA 2's 2,700W surge gives more headroom to start a fridge or pump than the C1000's 2,400W. For motor-driven loads that spike hard on startup, that 300W of extra surge is the DELTA 2's practical edge.
the DELTA 2 surges to 2,700W vs the C1000's 2,400Wboth run 1,800W continuousfridges and pumps spike 2-3x their rated draw on startup
Why it mattersIf you'll start a compressor or pump, the DELTA 2's higher surge is the safer inverter.
solar input
The C1000 refills faster from panels (600W vs 500W) and carries a standout owner-reliability story — a year-plus at 97% capacity through repeated outagesB2 — where the DELTA 2's record is solid but its fans trigger at loads as low as 120WA1. Both are loud under stress; the C1000's edge is the proven track record and the faster solar.
the C1000 takes 600W of solar vs the DELTA 2's 500Wone C1000 ran over a year at 97% capacity with zero issuesB2both units draw fan-noise complaintsA1B1
Why it mattersSolar-reliant buyers, or those who prize a proven reliability record, get all of that from the C1000 — and now at the lower price too.
The specific dimensions that decide these two units — everything else is a tie.
Lifetime Value
Selected because: The C1000 is now cheaper and cheaper to own on near-identical specs.
cost / lifetime kWh
Value now favors the C1000. At $449 it's $50 cheaper than the DELTA 2 and lands at $0.14 per lifetime kWh to own against $0.16 — on the same 1,800W output, 3,000-cycle LFP, and roughly the same capacity, with its slightly bigger battery widening the running-cost gap. For the fundamentals of a 1kWh unit, the Anker is now the cheaper way in.
The gap is small, though, and the DELTA 2 is no slouch on value in its own right. This isn't a blowout; it's a $50 edge, plus more solar and the stronger reliability record, that the DELTA 2's higher surge can offset for the right buyer.
What the Specs Don't Tell You
Selected because: Surge (DELTA) vs solar (C1000), plus shared fan noise.
The gotchas split cleanly. The DELTA 2 surges to 2,700W against the C1000's 2,400W — more headroom for a hard-starting fridge or pump. The C1000 counters with 100W more solar input (600W vs 500W), refilling a bit faster from panels. Neither difference is dramatic, but they point at different priorities: motor loads versus solar speed.
Both share the same real weakness: fan noise. The DELTA 2's fans trigger at loads as low as 120W and get loud during fast chargingA1A2; the C1000's fan noise is its single most common owner complaintB1. Neither is a quiet unit under load, so if silence matters, both disappoint — and a newer-generation model from either brand is the fix.
Brand Trust
Selected because: The C1000's reliability record vs EcoFlow's ecosystem and app.
This is where the C1000 makes its strongest case. Anker's C1000 carries a standout owner-reliability record — one reviewer ran it over a year at 97% of original capacity with zero issues, riding out repeated outagesB2 — and reviewers credit it with nailing the fundamentals, from fast recharge to a strong inverterB3. Anker brings parent-brand consumer-electronics trust, though SOLIX-specific support is reportedly slipping.
EcoFlow answers with the deepest ecosystem and a top-rated app, and the DELTA 2 has its own 18-month reliability testing behind itA3 — but its fan behavior is a documented quirk EcoFlow has said it plans to addressA4, and the brand carries an October 2025 DELTA Max 2000 recall worth noting. Two trustworthy units; the C1000's proven longevity is the tiebreaker, and now it comes at the lower price rather than a premium.
Growth Path
Selected because: Both expand — a shared strength worth noting.
solar input
Both units expand, so neither locks you in — you can add capacity to either as your needs grow. That's a shared strength at this size, where a 1kWh base often isn't enough for longer trips or bigger backup jobs.
So expansion isn't a differentiator here; it's a reason to feel good about either choice. Whichever you pick, outgrowing ~1kWh means adding a battery, not rebuying the unit — which makes the decision safely about price, surge, solar, and reliability rather than future-proofing.
Strengths & trade-offs
EcoFlow DELTA 2
Strengths
- +Lighter by 1.4 lb
Trade-offs
- –No major technical downsides compared to rival.
Anker SOLIX C1000
Strengths
- +Costs $50 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
Neither unit can fully handle this scenario (needs 2,100Wh). You'd need a higher-capacity station or to cut back on usage.
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 ~1kWh unit fully covers an 8-hour fridge-and-lights blackout on one charge, so both lean on expansion or solar to stretch it. Between them, the DELTA 2's higher 2,700W surge is the safer bet for starting a fridge compressor when the grid drops; the C1000's faster solar helps more if the outage runs into daylight.
Battery budget usedlower = more headroom
LOAD Fridge 150W×8h · Router + Modem 20W×8h · LED Lights (4 bulbs) 40W×6h · Phone Charger 15W×3h
SCN-03 · 8 hours · needs 320Wh
CPAP Overnight
Sleep therapy without interruption — the #1 medical use case
Either unit
A CPAP's overnight draw leaves either unit with a comfortable reserve, so this comes down to noise — and neither wins cleanly. Both draw fan-noise complaints under load, though a CPAP's light draw shouldn't spin the fans up much on either. If bedside silence is critical, a newer, quieter unit beats both; between these two it's roughly even.
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 laptop-monitor-router workday fits inside either 1kWh unit with room to spare, so runtime isn't the question. It comes down to the small stuff: the DELTA 2's higher surge, or the C1000's lower price and faster solar top-up if you're working off-grid. Both keep a desk running comfortably through the day.
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
Both handle game day easily. Since capacity isn't the deciding factor, consider weight: the lighter unit is easier to load into a truck bed. Also check if either has Bluetooth speaker-level noise. Fan sound matters in social settings.
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 can fully handle this scenario (needs 4,685Wh). You'd need a higher-capacity station or to cut back on usage.
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 13, 2026
Verdict: the SOLIX C1000
A close call between two well-proven 1kWh units, and at these prices the Anker SOLIX C1000 edges it at $449 to the EcoFlow DELTA 2's $499. They share the same 1,800W output, 3,000-cycle LFP, 20ms UPS, and expandability, and both hold about 1kWh (1,056 vs 1,024Wh). The C1000 is now $50 cheaper, costs less to own ($0.14 vs $0.16 per lifetime kWh), takes 100W more solar (600W vs 500W), holds a hair more capacity, and carries a standout owner-reliability record — one unit ran over a year at 97% capacity through repeated outages. The DELTA 2 answers with a higher surge (2,700W vs 2,400W) for starting bigger motors and about 1.4 lbs less weight. Both draw fan-noise complaints. Take the C1000 for the lower price, lower cost-to-own, more solar, and proven reliability; take the DELTA 2 if you specifically need the higher surge.
Editor-assigned confidence, based on cited owner research and spec analysis.
List prices as of July 13, 2026. The links below open EcoFlow's and Anker's current prices.
$449.00 list · direct from Anker
or check the DELTA 2 price$499.00 list
Written by Ian Schneider, Solar & Off-Grid Tester · Station Arena Test Desk · Updated July 13, 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 2 rates 4.0/5 (39th percentile of 24 Everyday-class units), and SOLIX C1000 rates 4.5/5 (70th 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.
DELTA 2: 50dB Under Load
Both units get loud under heavy load or fast charging — the DELTA 2's fans trigger at loads as low as 120W, and the C1000's fan noise is its single most common owner complaint. This is a shared weakness rather than a differentiator; neither is a quiet unit when working hard, so if silence matters, a newer-generation model from either brand is the fix.
Warranty Value Comparison
Both carry a 5-year warranty, so coverage is a wash. With the C1000 now the cheaper unit at $449, the identical warranty just means its lower price isn't a durability tradeoff — same protection, less money, on near-identical 1kWh hardware.
SOLIX C1000: Noise Level Not Disclosed
The DELTA 2 publishes its noise level (50dB), but the SOLIX C1000 doesn't. Brands that don't disclose noise specs often have louder units. If noise matters to you (CPAP users, apartment dwellers), this is worth investigating before buying.
Full record above — the Test Desk pick is the SOLIX C1000.
Check SOLIX C1000 price →or check the DELTA 2 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 ($0.16/kWh vs $0.14/kWh). The price difference is what you see on the sticker — neither is a hidden bargain or rip-off.
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. Supports up to 180kWh modular expansion with DELTA Pro Ultra X.
Worth knowing
The Oct 2025 DELTA Max 2000 recall (overheating/fire risk, 6 incidents) is worth noting. Also 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
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
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
EcoFlow brings the deepest ecosystem and a top-rated app, with an October 2025 DELTA Max 2000 recall on its record; the DELTA 2 is a dependable older-gen unit whose fan behavior is a known quirk EcoFlow says it plans to address. Anker brings parent-brand trust from its consumer-electronics dominance and a C1000 with a standout owner-reliability record, though SOLIX-specific support is reportedly slipping. Both are trustworthy. The split is the DELTA 2's higher surge against the C1000's lower price, faster solar, and proven longevity — and both brands now sell newer 1kWh models worth a look before you commit.
Growth path
DELTA 2
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 2
The DELTA 2 has a solid reliability record — one reviewer ran it 18 months through multiple power outages without troubleA3 — and EcoFlow's fast charging and app draw praise. Its documented weakness is fan noise: the fans trigger at loads as low as 120W and, during fast charging at 1,200W, sound like a gaming laptop under loadA1A2.
EcoFlow has indicated it plans to address the fan behaviorA4, so it may improve, but as it stands the noise is the DELTA 2's main knock against an otherwise dependable unit.
“When charging at 1200W the fans sound like a gaming laptop, though you can lower the charging speed in the app to silence it.”
Sources
portablepowerlab.com
Anker SOLIX C1000
The C1000's standout is proven reliability: one reviewer ran it over a year at about 97% of original capacity with zero issues, riding out repeated outages cleanlyB2. Reviewers credit it with nailing the fundamentals — fast AC recharge, a strong inverter — and handling virtually any household appliance short of central ACB3B4.
Its recurring knock, like the DELTA 2's, is fan noise: it's the single most common owner complaint, ramping up audibly under fast charging or heavy outputB1.
“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 moderate-to-high load is the dominant, repeatedly-cited complaint; the fan spins up above ~120W. [DELTA 2 · 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
“Fans trigger at anything above 120 watts; at maximum load (1,500–1,800W) they run continuously at ~48–55 dB. Powering medical equipment above 120W in a bedroom means listening to the fans or running an extension cable out of the room.”
portablepowerlab.com — EcoFlow Delta 2 Review: 6 Months of Real Use; PCWorld — EcoFlow Delta 2 review · 2026 · [negative]
- A2
“When charging at 1200W the fans sound like a gaming laptop, though you can lower the charging speed in the app to silence it.”
PCWorld — EcoFlow Delta 2 power station review · 2026 · [mixed]
- A3
“After 18 months of real-world testing through multiple power outages, camping trips, and daily home-office use, the unit earned recognition for fast charging, reliable LiFePO4 battery chemistry, and expandability.”
portablepowerlab.com — EcoFlow Delta 2 Review: 6 Months of Real Use · 2026 · [positive]
- A4
“EcoFlow officials indicated they plan to address the fan noise in an upcoming firmware update, as they have for other models after release.”
portablepowerlab.com — EcoFlow Delta 2 Review · 2026 (dated claim — may be partially addressed) · [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 July 13, 2026.
Who Should Buy Which
Buy the DELTA 2 if you…
- →You specifically need the higher surge — the 2,700W tops the C1000's 2,400W for hard-starting motor loads.
- →You want the slightly lighter body (27 vs 28.4 lb) and value EcoFlow's app and ecosystem, plus a proven 18-month reliability recordA3.
- →You don't mind paying $50 more, since the surge is what you're after.
Buy the SOLIX C1000 if you…
- →You want the better value — $449, $50 less than the DELTA 2 and lower to own ($0.14 vs $0.16 per lifetime kWh).
- →You recharge from solar — 600W of input beats the DELTA 2's 500W — and want a hair more capacity.
- →You want the strongest proven reliability record — a year-plus at 97% capacityB2.
If neither fits
Both are ~1kWh units, and neither covers a two-night camping trip or a full 8-hour blackout on one charge. Both expand, so you can grow either; if you need more from the start, step up to a 2kWh-plus base, and note both brands have newer-generation 1kWh models worth comparing.
The Bottom Line
Take the Anker SOLIX C1000 for value, solar, and reliability. At $449 it's $50 cheaper than the DELTA 2, costs less to own ($0.14 vs $0.16 per lifetime kWh), takes 100W more solar, and its standout owner record — a year-plus at 97% capacityB2 — is the reassurance that seals it on near-identical 1kWh hardware. Both draw fan-noise complaints, so don't buy either for silenceB1.
Take the EcoFlow DELTA 2 if you specifically need the higher surge. Its 2,700W tops the C1000's 2,400W for starting bigger motors, and it's about 1.4 lb lighter — but you'll now pay $50 more for it, and its fans are a documented quirk EcoFlow says it plans to fixA4. This is a genuine near-tie; let surge versus value-solar-and-track-record decide.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
EcoFlow DELTA 2 vs Anker SOLIX C1000 — which should I buy?
It's close. The C1000 is now cheaper ($449 vs $499), costs less to own ($0.14 vs $0.16 per lifetime kWh), takes 100W more solar input, holds a hair more capacity, and carries a standout reliability record (a year-plus at 97% capacity) — the value pick. The DELTA 2 counters with a higher surge (2,700W vs 2,400W) and about 1.4 lb less weight. Both share 1,800W output and both draw fan-noise complaints. Choose the C1000 for price, solar, and proven longevity; the DELTA 2 for surge.
Which is more reliable?
Both have solid records, but the C1000's is the standout — one reviewer ran it over a year at about 97% of original capacity with zero issues through repeated outages. The DELTA 2 held up through 18 months of testing across multiple outages too, so neither is a risk; the C1000 just has the more impressive long-term data point of the two.
Are these units loud?
Both can be, under load. The DELTA 2's fans trigger at loads as low as 120W and get loud during fast charging; the C1000's fan noise is its most common owner complaint, ramping up under heavy output. Neither is silent when working hard, so if quiet operation matters, look at a newer-generation model from either brand.
Which charges faster from solar?
The Anker SOLIX C1000, with 600W of solar input to the DELTA 2's 500W — so it refills a bit faster from panels. The difference is modest but real for off-grid or camping use. If solar is your main recharge method, it's a point in the C1000's favor; for wall charging, both are quick.
Where to buy
EcoFlow DELTA 2
$499.00
$499.00 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.