Head-to-head test
EcoFlow DELTA 2 vs Anker SOLIX C1000X Gen 2
Both boxes are quiet until you work them and loud once you do — the difference is the DELTA 2 admits it hits 50 dBA and costs $321 less, while the Anker keeps its noise number to itself and asks a premium for a faster UPS and more cycles most buyers won't need.
Written by Ian SchneiderUpdated
Solar & Off-Grid Tester, Station Arena Test Desk
EcoFlow
DELTA 2
2,994Power Score · Appliance Class
$499.00 · direct from EcoFlow
Last checked 46 days ago. Prices move — check before you buy.
Anker
SOLIX C1000X Gen 2
2,776Power Score · Appliance Class
$599.99 · direct from Anker
down from $800 · 25% below usual
Last checked 6 days ago. Prices move — check before you buy.
Spec deltas
The DELTA 2 costs $321 less than the Anker C1000X Gen 2 and is the cheapest box here to own, at $0.16 per lifetime kilowatt-hour. Same 1,024Wh, and the cheaper one takes an expansion battery the Anker doesn't. For a lot of buyers the value case closes before the spec sheet gets interesting.
The Anker earns its premium on refinement: 4,000 charge cycles to the DELTA 2's 3,000, a 10ms line-interactive UPS against 20ms standby, a faster 140W USB-C port, and 2.1 lb shaved off at 24.9 lb. The wrinkle is noise, which both units get wrong in opposite ways. The DELTA 2 is honestly loud under load — a documented 50 dBA, with fans that spin up under moderate outputA1 — while the Anker is near-silent at low draw but won't publish a figure for when it's working hardB2.
Take the DELTA 2 unless you specifically need the faster UPS or the longer cycle life. It's $321 cheaper, cheaper to own, expandable, and its one real flaw — fan noise under heavy load — is a flaw the Anker mostly shares and simply declines to disclose. The Anker is the more polished machine. The DELTA 2 is the one that leaves $321 in your pocket for a downside you only hear when you're pushing it.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
cost / lifetime kWh
That $321 is most of a second DELTA 2, or the entire expansion battery that would double its capacity. The Anker spends the gap on refinement — more cycles, a faster UPS — not on more energy or more flexibility, which are the two things a 1kWh buyer usually reaches for next.
DELTA 2 $479 vs Anker $800Both hold 1,024Wh; DELTA 2 costs $0.16 per lifetime kWh vs Anker's $0.20The DELTA 2 is expandable; the Anker is sealedB10
Why it mattersIf value or headroom is the priority, the DELTA 2 wins outright and the Anker's polish is beside the point.
At CPAP-and-phones draw, both sit below their fan thresholds and stay quietA1B2; push either toward its inverter's limit and both get loudA1B1. So the honest noise difference is narrow — the Anker stays silent to a slightly higher load — and the Anker charges $321 partly for a margin it won't even print.
The DELTA 2 lists 50 dBA under load, with fans spinning up under moderate outputA1The Anker publishes no noise figure, but is near-silent at low draw and loud under heavy outputB1B2A CPAP or a few charging devices draw only a light load
Why it mattersLight-load users can ignore the noise column entirely; heavy-load users should know both boxes are loud, and only one owns up to it.
rated cycles
For a desktop or a NAS, 10ms line-interactive is 'trusted mid-save' where 20ms standby is 'usually fine'B7, and 4,000 cycles bank 1,024 more kilowatt-hours over the unit's life. These are the buyers for whom the $321 buys real value instead of polish.
Anker: 10ms line-interactive UPS vs the DELTA 2's 20ms standbyB7Anker: 4,000 cycles vs the DELTA 2's 3,000 — 1,024 more lifetime kWhBoth carry the same five-year warranty
Why it mattersIf blackout desk duty or maximum longevity is the job, the Anker's premium finally earns itself; otherwise it doesn't.
It's a small thing that hints at a larger one: the cheaper unit's maker at least gestured at fixing its known flawA4, while the pricier unit's maker has a habit of subtracting after the sale. Neither is decisive, but if you're betting on which box improves once you own it, the arrows point uncomfortably for the premium pick.
EcoFlow signaled a firmware update to address the DELTA 2's fan noiseA4Anker firmware updates have removed features without warningBoth units lean on their apps for full control
Why it mattersBuyers who care about post-purchase software support have one more small reason to lean DELTA 2, or at least not to pay up for the Anker on trust.
The specific dimensions that decide these two units — everything else is a tie.
Lifetime Value
Selected because: DELTA 2 is the cheapest here to own and $321 under the Anker — the spine of the verdict.
cost / lifetime kWh
The DELTA 2 is the cheapest box on this comparison to own, at $0.16 per lifetime kilowatt-hour, and it undercuts the Anker's sticker by $321 — $479 against $800. The Anker banks more total energy across its longer life, 4,096 kWh to 3,072, but you're fronting $321 today for cycles that land decades out. For the money you'd spend closing that gap you could very nearly buy a second DELTA 2. On pure value, this isn't close.
What the Specs Don't Tell You
Selected because: Six cards fire, two of them about noise — the frame for the whole matchup, with the Anker's genuine UPS/cycle wins alongside.
rated cycles
Six cards fire and they tug in both directions. The Anker takes the honest wins that matter for a desk: a 10ms line-interactive UPS against 20ms standby, and 4,000 cycles against 3,000. But two of the six are about noise, and they frame the matchup — the DELTA 2 gets flagged for a 50 dBA figure under load, while the Anker gets flagged for publishing no figure at all. One box is loud and says so; the other is quiet until it isn't and stays quiet about it. Warranty ties at five years, and expansion goes to the DELTA 2. Net it out and the cards justify the Anker for a specific buyer, not a general one.
Growth Path
Selected because: Sealed Anker vs expandable DELTA 2; DELTA-2-plus-battery still undercuts the Anker's solo price.
solar input
The DELTA 2 takes an EcoFlow expansion battery; the Anker is sealed at 1,024WhB10. It's the same structural split that recurs whenever this Anker meets an EcoFlow — the cheaper, older unit is the one with a future, and the pricier refresh is the dead end. For a buyer who might drift toward partial-home backup, a DELTA 2 plus an expansion battery is a real path, and it still lands under the Anker's solo price. The Anker asks you to be sure 1,024Wh is your ceiling for good.
Brand Trust
Selected because: Cross-brand: EcoFlow's fix-it-in-software signal and deeper ecosystem vs Anker's feature-removing firmware and softer support.
EcoFlow and Anker split the trust ledger in revealing ways. EcoFlow brings the biggest catalog and community, plus a stronger return safety net if you buy through Costco or Amazon — shadowed by an October 2025 DELTA Max 2000 recall and a paused experiment in paywalling app features. Anker brings parent-brand trust and a service reputation slipping from excellent, plus firmware updates that have removed features without warning. On the DELTA 2's specific flaw, EcoFlow at least signaled a firmware fix for the fan noiseA4 — the kind of small tell that matters when you're choosing which company to trust for five years.
PowerScore Breakdown
Selected because: DELTA 2 3,167 vs Anker 2,929 — score and price agree the DELTA 2 is the sensible default.
overall power score
The DELTA 2 posts the higher PowerScore, 3,167 to 2,929, carried by its expandability and its price-for-capability. The Anker's gains — more cycles, a faster UPS, a bit more output and solar input — are real but weighted toward endurance and edge cases the score discounts against flexibility. As with the money, the composite and the price agree: the DELTA 2 is the sensible default, and the Anker is the specialist's pick.
Strengths & trade-offs
EcoFlow DELTA 2
Strengths
- +Costs $101 less
Trade-offs
- –Shorter-lived battery — rated for 3,000 charge cycles vs the SOLIX C1000X Gen 2's 4,000, so it wears out sooner.
Anker SOLIX C1000X Gen 2
Strengths
- +Lighter by 2.1 lb
- +Higher AC output
- +Faster solar charging
- +Rated for 4,000 charge cycles — much longer battery lifespan
Trade-offs
- –Sealed capacity — the DELTA 2 can add batteries to grow past 1,024Wh; this one can't.
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
A 2,100Wh weekend is more than double either 1,024Wh box — a tie both lose. The DELTA 2 is the one you rescue with an expansion battery; the sealed Anker would need a whole second unit.
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 this scenario's 1,645Wh: the DELTA 2 comes up 775Wh short (about 53% covered), the SOLIX C1000X Gen 2 775Wh (53%). Either gets you most of the way, so this is a scenario you plan around rather than one you should rule them out for.
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 320Wh night is a light load for either box — both have energy to spare and neither's fans have reason to spin up hard. Break it on the carry: the Anker is 2.1 lb lighter at 24.9 lb to move to the nightstand, and the DELTA 2's noise reputation is a heavy-load story, not a CPAP one.
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 910Wh workday just overruns both — finish on the laptop's own charger and either gets you there. For desk backup itself, the Anker's 10ms switchover is the real differentiator over the DELTA 2's 20ms standby.
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
670Wh of tailgate fits either box with room left over. The deciding spec is the walk from the lot: the Anker is 2.1 lb lighter in hand, though the DELTA 2 leaves $321 in your pocket for ice and burgers.
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
A 4,685Wh day is more than four times either box — neither belongs in a full-time van alone. This is expansion territory, and only the DELTA 2 can grow into it.
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
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 0–58hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–11.6hHigh-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 18, 2026
Verdict: the DELTA 2, on Power Score margin
The DELTA 2 is $321 cheaper than the Anker C1000X Gen 2, the cheapest box here to own at $0.16 per lifetime kilowatt-hour, and the only one of the two that takes an expansion battery. Both hold the same 1,024Wh and carry the same five-year warranty. The Anker earns its premium on refinement — a 10ms line-interactive UPS against 20ms standby, 4,000 cycles to 3,000, a faster 140W USB-C port, and 2.1 lb shaved off — but those are narrow wins. The DELTA 2's one real flaw is fan noise under load, and the twist is the Anker mostly shares it and simply won't publish a figure. Take the DELTA 2 unless you specifically need the faster UPS or the longer cycle life; it leaves $321 in your pocket for a downside you'll only hear when you push it.
Editor-assigned confidence, based on cited owner research and spec analysis.
List prices as of July 18, 2026. The links below open EcoFlow's and Anker's current prices.
$499.00 · direct from EcoFlow
Last checked 46 days ago. Prices move — check before you buy.
or check the SOLIX C1000X Gen 2 price$599.99 list
Written by Ian Schneider, Solar & Off-Grid Tester · Station Arena Test Desk · Updated July 18, 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 4.4/5 (65th percentile of 24 Everyday-class units), and SOLIX C1000X Gen 2 rates 3.7/5 (22nd 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 2 is loud under load, and honest about it
The DELTA 2 hits about 50 dBA under heavy output, and the fans spin up well before that. Run a fridge or a microwave and you'll hear it; run a CPAP or charge a few phones and you won't. The saving grace is control — the app throttles charge speed to quiet the fans during a refill, and EcoFlow has signaled firmware tuning for the noise.
SOLIX C1000X Gen 2: Fixed Capacity
The SOLIX C1000X Gen 2 is sealed at 1,024Wh — a complete unit, and already larger than the DELTA 2's 1,024Wh. By contrast the DELTA 2 can add expansion batteries, but that only pulls ahead if you'd grow past 1,024Wh.
The Anker's cleanest win
The Anker switches over in 10ms as a line-interactive UPS; the DELTA 2 is 20ms standby, a class behind. For a desktop mid-save or a NAS that hates blips, that's the difference between trusted and usually fine. It's the single spec that most justifies the Anker's $321 premium — for the buyer who actually needs it.
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 DELTA 2 works out at 10 years of cover per $1,000 spent against the SOLIX C1000X Gen 2's 6.3, but that spread is the price gap, not the terms.
Battery Lifespan in Real Years
The SOLIX C1000X 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. After hitting the cycle limit, the battery doesn't die — it drops to ~80% of original capacity, which is still very usable.
The Anker won't print its number
The Anker C1000X Gen 2 leaves the noise spec blank, and blank is not the same as quiet. It's near-silent at low draw but gets loud under heavy output, the same shape as the DELTA 2's curve without the published figure. For a bedroom or CPAP at light draw both are fine; for heavy loads, you're trusting an unlisted number against a listed one.
Full record above — the Test Desk pick is the DELTA 2.
Check DELTA 2 price →or check the SOLIX C1000X Gen 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
The DELTA 2 wins on both sticker price and long-term value. At $0.16/kWh over its lifetime, it's meaningfully cheaper to own. Clear value winner.
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 very top of the range, the DELTA Pro Ultra platform stacks batteries and inverters into whole-home backup — a flagship path, not a line-wide feature.
Worth knowing
EcoFlow runs the deepest catalog and largest community in the category, and signaled a firmware fix for the DELTA 2's fan noise. Asterisks: an October 2025 DELTA Max 2000 recall and a paused app-paywall experiment. Buying via Costco or Amazon strengthens your return options.
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 replacement reputation is real but softening, and its firmware updates have removed features without notice — worth weighing against a unit that won't even disclose its noise level. The expansion ecosystem is smaller than EcoFlow's, too.
Analyst note
EcoFlow is the volume incumbent with the deeper ecosystem and a fix-it-in-software habit, carrying a recall on its record; Anker brings parent-brand trust and softening service. For a value-first 1kWh buyer weighing price, expansion, and post-sale support, the arrows line up behind the cheaper DELTA 2.
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 C1000X Gen 2
FIXED CAPACITYFixed at 1,024Wh, with no expansion — so size it for your needs up front rather than planning to add capacity later.
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.
Realistic full solar rechargeat 70% of rated panel output — see methodology
Analyst note
The SOLIX C1000X Gen 2 is sealed at 1,024Wh, which is fine if that covers you. The DELTA 2 starts at 1,024Wh and can grow beyond it with EcoFlow expansion batteries — though at this size expansion means longer runtimes on the same loads, not a path to home backup. More hours, not more house.
What Owners Report
Patterns from published owner reports and long-term reviews — every claim cited to its source below.
EcoFlow DELTA 2
Fan noise is the DELTA 2's one loud, well-documented flaw, and it's loud in the literal sense. The fans trigger under moderate load and run continuously at around 50 dB near full output, enough that powering medical gear above that threshold in a bedroom means either listening to it or running an extension cord out of the roomA1. Fast-charging at high wattage sounds like a gaming laptop, though the app lets you throttle charge speed to quiet itA2.
Past the noise, owner sentiment is strong and long-run. After a year and a half of outages, camping trips, and daily home-office use, testers credit fast charging, reliable LiFePO4 chemistry, and expandability as the reasons to buyA3. EcoFlow even signaled a firmware update to tame the fan behavior, as it has for other models post-launchA4. The knock is real, but it's one flaw on an otherwise well-liked box.
“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 C1000X Gen 2
On noise the Anker is a study in contrasts, fitting for a unit that won't print a dBA number. Under light loads it's rated near-silent, 0 to 20 dB below 200W, quiet enough for an office or bedroomB2 — but push the output up and the fans get loud enough that owners wouldn't run it in the room while sleepingB1. Quiet where the DELTA 2 is quiet, loud where the DELTA 2 is loud, minus the published figure.
The rest is the familiar picture for this SKU: a 10ms UPS switchover below the threshold where a desktop drops its session or a NAS corruptsB7, a fast wall recharge that hits its headline number only with UltraFlash enabled in the appB4B5, and a bright display and labeled ports that are easy to live with, though the handle wants two hands over distanceB6. Field data on this exact unit is still thin and mostly paraphrased from retailer pages — early returns, not a verdict.
“Near-silent under light loads — rated 0 to 20dB under 200W — quiet enough for an office or bedroom when it's just sitting idle or trickle-charging.”
Sources
backuppowerhub.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]
- Fans are near-silent at light loads but become loud enough to disturb sleep once output or AC charge current climbs. [SOLIX C1000X Gen 2 · 2 entries]
- Losing the external expansion-battery option available on the original C1000X is the most consistent point of disappointment, raised by both owners and the dedicated review. [SOLIX C1000X Gen 2 · 2 entries]
- Fast, reliable AC recharge and an out-of-box-ready charge level are the headline praise, though the full 49-minute figure requires manually enabling UltraFlash in the app, and a minority of owners mention occasional charging hiccups. [SOLIX C1000X Gen 2 · 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
“Under heavy load the fans kick on and get loud enough that you wouldn't want it running in the room while sleeping.”
Home Depot — Anker SOLIX C1000X Gen2 (2,000W/1,024Wh) customer reviews · unknown · [negative]
- B2
“Near-silent under light loads — rated 0 to 20dB under 200W — quiet enough for an office or bedroom when it's just sitting idle or trickle-charging.”
backuppowerhub.com — Anker SOLIX C1000X Gen 2 Review (Dark Grey Flagship Refreshed) · 2026 · [positive]
- B4
“Arrived nearly fully charged and was easy to use right out of the box; recharge from empty to full at the wall is genuinely fast, which matters when you only get a short window of power.”
Best Buy — Anker SOLIX C1000X Gen2 (SOLIX-65-PS) customer reviews · unknown · [positive]
- B5
“The 49-minute headline recharge only happens once you go into the Anker app and switch on UltraFlash mode — it isn't how the unit charges by default.”
backuppowerhub.com — Anker SOLIX C1000X Gen 2 Review · 2026 · [mixed]
- B6
“Display is bright enough to read outdoors and ports are clearly labeled so cables stay untangled; the carry handle is fine for short moves but you'll want two hands over any real distance.”
Best Buy — Anker SOLIX C1000X Gen2 (SOLIX-65-PS) customer reviews · unknown · [positive]
- B7
“10ms UPS switchover — reviewer notes that's below the threshold where a desktop PC loses its session or a NAS drive risks corruption.”
backuppowerhub.com — Anker SOLIX C1000X Gen 2 Review · 2026 · [positive]
- B10
“Does not support an external expansion battery module — capacity is fixed at 1,024Wh with no upgrade path, unlike the original C1000X's optional add-on pack.”
backuppowerhub.com — Anker SOLIX C1000X Gen 2 Review · 2026 · [negative]
Research compiled July 18, 2026.
Who Should Buy Which
Buy the DELTA 2 if you…
- →Value buyers above all: $321 less, the cheapest here to own at $0.16 per lifetime kWh, and expandable on top.
- →Anyone eyeing more capacity later: it takes an EcoFlow expansion battery, and DELTA 2 plus battery still costs less than the Anker alone.
- →Light-load users who don't mind honesty: at CPAP-and-phones draw it stays below its fan thresholdA1, and you know exactly how loud it gets when it doesn't.
Buy the SOLIX C1000X Gen 2 if you…
- →Desk and NAS backup: the 10ms line-interactive UPS beats the DELTA 2's 20ms standbyB7, the cleanest reason to pay the premium.
- →Longevity buyers: 4,000 cycles and 4,096 lifetime kWh against 3,000 and 3,072 — real endurance, if you'll use it.
- →Low-load bedroom users who want the quieter margin and lighter carry: near-silent at low drawB2 and 2.1 lb lighter at 24.9 lb — just don't expect a disclosed noise number.
If neither fits
If your real load is the weekend basket (2,100Wh), an 8-hour blackout (1,645Wh), or van life (4,685Wh), a single 1,024Wh box covers under half. Start with the DELTA 2 and its expansion battery, or move up to the 2kWh class.
The Bottom Line
The DELTA 2 wins on the numbers that decide most 1kWh purchases: $321 cheaper, the cheapest here to own at $0.16 per lifetime kilowatt-hour, and expandable where the Anker is sealed. Its one real flaw is fan noise under load — and the twist is that the Anker mostly shares that flaw and just declines to publish the figure. One box is loud and says so; the other is loud and stays quiet about it.
Buy the Anker if you specifically need its 10ms UPS or its longer cycle life, and the polish is worth $321 to you. Everyone else should take the DELTA 2, pocket the difference, and turn the charge speed down in the app when the fans get chatty.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Is the Anker C1000X Gen 2 worth $321 more than the EcoFlow DELTA 2?
For most buyers, no. You get the same 1,024Wh and the same five-year warranty from the DELTA 2, plus expansion and the cheapest ownership here. The Anker buys 4,000 cycles, a 10ms UPS, a 140W USB-C port, and a 2.1 lb lighter body — worth $321 only to a desk-backup or maximum-longevity buyer.
Which one is quieter?
It's trickier than it sounds. The DELTA 2 is honestly loud under load at around 50 dBA, with fans that spin up under moderate output; the Anker publishes no figure and also gets loud under heavy output, though it's near-silent at low draw. At CPAP-level draw both are quiet; at kitchen-level draw both are loud. The Anker holds a slightly higher quiet threshold — if you trust an undisclosed spec over a disclosed one.
Which is better for a home-office UPS?
The Anker. Its 10ms line-interactive switchover keeps a desktop alive mid-save where the DELTA 2's 20ms standby is a class behind. That single spec is the strongest case for paying the Anker's premium, and the main reason a desk-backup buyer should cross the price gap.
Can I expand either one?
Only the DELTA 2. It accepts an EcoFlow expansion battery; the Anker C1000X Gen 2 is sealed at 1,024Wh. And a DELTA 2 with its expansion battery still costs less than the Anker on its own, which makes the sealed premium unit a hard sell for anyone eyeing growth.
Which lasts longer?
The Anker, at 4,000 charge cycles to the DELTA 2's 3,000 — about 1,024 more kilowatt-hours over its life. But the DELTA 2 has a year-plus of documented real-world use behind it, and cycled weekly both run well past 50 years. Longevity is the Anker's edge; proof-in-the-field is the DELTA 2's.
Where to buy
EcoFlow DELTA 2Pick
$499.00
$499.00 · direct from EcoFlow
Last checked 46 days ago. Prices move — check before you buy.
Anker SOLIX C1000X Gen 2
$599.99
$599.99 · direct from Anker
down from $800 · 25% below usual
Last checked 6 days ago. Prices move — check before you buy.
Prices may vary by retailer and are subject to change.