Head-to-head test
EcoFlow DELTA 2 vs Anker SOLIX S2000
EcoFlow has stopped selling the DELTA 2, and the startup headroom it was supposed to win on belongs to the Anker: 3,000W of peak against 2,700W.
Full profiles: EcoFlow DELTA 2 β Β· Anker SOLIX S2000 β
Written by Ian SchneiderUpdated
Solar & Off-Grid Tester, Station Arena Test Desk
Spec deltas
EcoFlow no longer sells the DELTA 2. Its store page forwards to the DELTA 3, which settles the recommendation before either spec sheet gets a vote: the SOLIX S2000 is the one of these two you can still buy new. Everything below this is here because a DELTA 2 in somebody's garage, or on a retailer's shelf, is still a real unit worth comparing.
The S2000 would have earned it anyway. It holds 2,010Wh against the DELTA 2's 1,024Wh, is rated for 10,000 cycles against 3,000, and peaks at 3,000W where the DELTA 2 stops at 2,700W. That last one is the figure people get backwards. The DELTA 2 carries more watts continuously, 1,800W against 1,500W, but the Anker is the one with room for a motor's startup kick.
What the DELTA 2 keeps is a lighter body at 27 lbs, a 500W solar ceiling against the Anker's 400W, one more AC socket, three more USB-A ports, and a port for expansion batteries. All of that is still true. None of it is orderable, which is the only fact on this page nobody can argue with.
What the Numbers Reveal
Each conclusion stated first β the numbers behind it on one line, the full analysis below.
continuous output
Motors break the tie. A fridge or an AC compressor briefly pulls two to three times its rated draw, so the S2000's 2Γ cushion clears that rule of thumb where the DELTA 2's 1.5Γ doesn't, and the figure that actually decides whether a given motor starts is the absolute ceiling, which is the Anker's by 300W. Change the load to a continuous draw above 1,500W and the whole thing inverts: the DELTA 2's 1,800W rating is then the only one on this page that covers it.
DELTA 2: 1,800W continuous output, 2,700W published peakSOLIX S2000: 1,500W continuous output, 3,000W published peakSurge-to-continuous ratio: 2Γ on the S2000 (3,000 over 1,500), 1.5Γ on the DELTA 2 (2,700 over 1,800)
Why it mattersIf the heaviest thing on your list has a compressor in it, take the S2000. If it's a heater or a kettle that sits above 1,500W for an hour, look at the DELTA 3, which is where EcoFlow now points DELTA 2 shoppers, rather than at leftover stock.
That is the difference between a plan and a purchase in the exact scenario people buy these for. The DELTA 2 ends an eight-hour outage 775Wh short, a little past halfway. The S2000 finishes it with 63Wh left. And the expansion plan now carries a second bill: you would be buying batteries to build around a base unit its maker has stopped selling.
SOLIX S2000: 2,010Wh, sealed, no expansion portDELTA 2: 1,024Wh with support for EcoFlow expansion batteries8-Hour Blackout load: 1,645Wh needed, against 870Wh usable on the DELTA 2 and 1,708Wh on the S2000 after the flat 15% conversion allowance
Why it mattersBuying for outages, take the sealed 2,010Wh, because it finishes tonight's. If you know you'll pass that figure, don't solve it by starting from a discontinued base unit.
solar input
That's the right shape for a blackout and the wrong shape for a week off-grid. A single outage ends, and the S2000 is back to full in under two hours on household powerB5. A solar-only stretch means budgeting most of a good day per refill, every day, and our Van Life Daily load of 4,685Wh leaves it 2,977Wh short before recharging even enters the picture.
S2000: 400W maximum solar input into 2,010WhDELTA 2: 500W maximum solar input into 1,024WhMeasured wall recharge on the S2000: 80% in about 1.2 hours, full in about 1.7 hours, on a 20-amp household circuitB5
Why it mattersOutage and weekend buyers can ignore the solar ceiling entirely. Anyone planning to live off the sun for days should be shopping a bigger station with a higher solar input, not choosing between these two.
The noise question here is really about recharging, not running. The DELTA 2 gets loud at 1,200W of input and the documented fix is to throttle the charge rate in the appA2, trading quiet for hours. The S2000's loud window is short by measurement instead, 80% in about 1.2 hours and then silence againB5B1B2. The two published dB ratings don't settle any of this, because each maker measures its own way and neither figure describes a light load, so weigh what was observed instead.
The DELTA 2's fans trigger at anything above 120W, and at full load, 1,500 to 1,800W, run continuously at about 48 to 55dBA1CPAP Overnight is about 40W for eight hours, 320Wh in totalTwo independent hands-on tests of the S2000 found it silent at idle, fans spinning up only under heavy load or the fastest charging modeB1B2
Why it mattersCPAP buyers can stop worrying about either unit's fan at 40W. Anyone who expects to recharge indoors during a multi-day outage should weigh the S2000's short loud window against the DELTA 2's choice between noise and a slower refill.
The specific dimensions that decide these two units β everything else is a tie.
Your Life, Your Pick
Selected because: Four of the six loads we model go to the SOLIX S2000, and the two it loses are losses for both units: 2,100Wh of weekend camping and 4,685Wh of van life sit outside what either box holds.
The eight-hour blackout is where this page stops being academic. The S2000 covers its 1,645Wh and lands with 63Wh of usable capacity left, a margin measured in minutes; add one more device to that list and it fails too. The DELTA 2 isn't close, with 870Wh usable against 1,645Wh needed, leaving it 775Wh short and the night a little past half covered.
Two rows go to neither unit, and they're the honest part of the table. Weekend camping's 2,100Wh leaves the S2000 392Wh short, close enough that dropping one appliance turns it into a pass. Van life's 4,685Wh leaves it 2,977Wh short, which no amount of list-trimming fixes. Above roughly 1,700Wh of usable draw in a day, the right answer stops being either of these.
What the Specs Don't Tell You
Selected because: The surge ceilings live here, and they run the other way from the output ratings: 3,000W peak on the S2000 against 2,700W, a 2Γ cushion against 1.5Γ.
rated cycles
Startup headroom goes to the Anker, which is the opposite of what the output ratings suggest. The S2000 peaks at 3,000W over a 1,500W rating, a 2Γ cushion, while the DELTA 2 peaks at 2,700W over 1,800W, or 1.5Γ. Motors briefly pull two to three times their rated draw, so the 2Γ is the one that clears the usual rule of thumb, and the absolute ceiling that decides whether a compressor starts is 300W higher on the Anker.
Then the deflating part: none of the six loads we model comes anywhere near either ceiling, the heaviest instantaneous draw in the set being the tailgate's 400W. Surge headroom is insurance against the one appliance we didn't put in the table, worth having and not worth agonizing over. Warranty is a wash at five years each, and the two published dB ratings are not a measured gap, because each maker picks its own conditions.
Growth Path
Selected because: The DELTA 2's expansion port starts from 1,024Wh, below the 2,010Wh the S2000 ships sealed, so the first battery catches up rather than pulls ahead.
solar input
Bolt an expansion battery onto a DELTA 2 and the first thing you buy is parity. 1,024Wh plus one battery gets you roughly to where the S2000 starts, sealed, at 2,010Wh, so expansion only earns its price past that figure. Below it you're paying to catch up.
There's a second bill now. The base unit has left EcoFlow's range, so an expansion plan means committing more hardware around a station its maker no longer sells. That's a different bet than it was while the DELTA 2 was current, and it's why the sealed box is the simpler value even for a buyer who expects to grow.
Lifetime Value
Selected because: 10,000 rated cycles against 3,000 works out to roughly 20,096kWh of lifetime energy against 3,072kWh, which is the durability gap stated as energy instead of as years.
Ten thousand rated cycles against three thousand is the gap that survives every other argument on this page, and it reads better as energy than as years: about 20,096kWh through the S2000's rated life against 3,072kWh through the DELTA 2's, because the Anker's cycle is a bigger cycle. At daily use that's 27.4 years against 8.2.
The cost-per-kilowatt-hour half of this section needs two live prices to mean anything, and this page has one, so read the cycle column and skip the cost column. Worth knowing what the cycle limit actually is, too: not death, but a drop to about 80% of original capacity, which is still a working battery.
Portability & Form Factor
Selected because: 27 lbs against 35.7 lbs is the one everyday difference still running the DELTA 2's way, and it is 8.7 lbs of it.
weight
8.7 lbs is the gap, and it's the difference between a one-hand grab and a considered lift: 27 lbs for the DELTA 2 against 35.7 lbs for the S2000. Reviewers at two separate outlets independently flagged the Anker's carry handle as its weak point, one of them asking outright for a second handle for stairsB7B8.
What decides whether that matters is how often the thing moves, not what it weighs. A unit that lives in a closet and comes out twice a year for outages can weigh 35.7 lbs without anyone minding. A unit loaded and unloaded every weekend is where the DELTA 2's lighter body was worth real money.
Strengths & trade-offs
EcoFlow DELTA 2
Strengths
- +Lighter by 8.7 lb
- +Higher AC output
- +Faster solar charging
Trade-offs
- βShorter-lived battery β rated for 3,000 charge cycles vs the SOLIX S2000's 10,000, so it wears out sooner.
Anker SOLIX S2000
Strengths
- +Larger battery capacity
- +Rated for 10,000 charge cycles β much longer battery lifespan
Trade-offs
- βNo 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 Β· 2 nights Β· needs 2,100Wh
Weekend Camping
Two nights off-grid with essential comfort
Neither unit
Neither box covers a 2,100Wh weekend. The S2000 comes up 392Wh short, which is one appliance's worth of list-trimming away from a pass. The DELTA 2 is 1,230Wh short, which is a different conversation: about 41% of the weekend covered against the Anker's 81%.
Battery budget usedlower = more headroom
LOADΒ Β Phone Charger 15WΓ6h Β· LED Lights 40WΓ8h Β· Box Fan 75WΓ14h Β· CPAP Machine 40WΓ16h
SCN-02 Β· 8 hours Β· needs 1,645Wh
8-Hour Blackout
Keep the essentials running through a night without power
SOLIX S2000
The S2000 finishes the night and the DELTA 2 doesn't, but read the margin before relaxing. 1,708Wh usable against 1,645Wh needed leaves 63Wh, which is minutes rather than hours, so one more device on the list turns this row over. The DELTA 2 stops 775Wh short, a little past halfway.
Battery budget usedlower = more headroom
LOADΒ Β Fridge 150WΓ8h Β· Router + Modem 20WΓ8h Β· LED Lights (4 bulbs) 40WΓ6h Β· Phone Charger 15WΓ3h
SCN-03 Β· 8 hours Β· needs 320Wh
CPAP Overnight
Sleep therapy without interruption β the #1 medical use case
Either unit
A CPAP is about 40W for eight hours, so both of these cover the night at least twice over β capacity isn't the question here. The only published difference is fan noise, and it can't settle this: the SOLIX S2000 is rated 30dB and the DELTA 2 50dB, but they are two makers' figures, each measured its own way. Neither settles which box is quieter at a bedside. Only the SOLIX S2000 is still sold, so a new purchase here is just the SOLIX S2000; the DELTA 2 is a used-market question.
Battery budget usedlower = more headroom
LOADΒ Β CPAP Machine 40WΓ8h
SCN-04 Β· 8 hours Β· needs 910Wh
Remote Workday
Full work day off-grid without power anxiety
SOLIX S2000
The DELTA 2 comes up just short β it needs 910Wh and has 870Wh usable, a 40Wh gap (its nameplate 1,024Wh actually clears this β the flat 15% conversion allowance is what tips it under). Trim that much β one small appliance's worth across the day β and it finishes. The SOLIX S2000 covers it outright with 798Wh to spare.
Battery budget usedlower = more headroom
LOADΒ Β Laptop 60WΓ8h Β· External Monitor 30WΓ8h Β· Router + Modem 20WΓ8h Β· Phone Charger 15WΓ2h
SCN-05 Β· 4 hours Β· needs 670Wh
Tailgate Party
Game day power for the crew
SOLIX S2000
Both handle game day; the SOLIX S2000 keeps more in reserve (39% used vs 77%). Tailgating is a light load, though, so the number you'll feel is weight: 27 lbs for the DELTA 2 against 35.7 lbs for the SOLIX S2000, from the trunk to the setup spot.
Battery budget usedlower = more headroom
LOADΒ Β Blender 400WΓ0.5h Β· LED TV (55") 80WΓ4h Β· Bluetooth Speaker 15WΓ4h Β· Phone Charger (Γ3) 45WΓ2h
SCN-06 Β· 24 hours Β· needs 4,685Wh
Van Life Daily
A full day of mobile living β the ultimate endurance test
Neither unit
Neither unit covers this scenario's 4,685Wh: the DELTA 2 comes up 3,815Wh short (about 19% covered), the SOLIX S2000 2,977Wh (36%). 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
LOADΒ Β Mini-Fridge 150WΓ24h Β· Laptop 60WΓ4h Β· Phone Charger 15WΓ3h Β· LED Lights 40WΓ5h Β· Fan 75WΓ8h
The Load Test
RUNTIME = (Wh Γ 0.85) Γ· 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: SOLIX S2000 runs 8.3h vs 4.2h.
Sold on Amazon
Planning for more than this? Describe your whole setup and get it sizedΒ β
Modeled from the spec record β same math as the tables below. Methodology
Runtime by appliance
Real-world runtime estimates for common appliances, modeled at 85% inverter efficiency.ΒΉ
Essentials
The basics you need runningscale 0β113.9hComfort & Convenience
Makes off-grid life actually enjoyablescale 0β22.8hHigh-Draw Appliances
These reveal the real limitsscale 0β1.7hΒΉ Runtime = (capacity Γ 0.85) Γ· 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 β see methodology.
Conclusion
September 19, 2026
Verdict: the Anker SOLIX S2000
Buy the SOLIX S2000. It's the only one of these two still in production, and it wins on its own terms anyway: 2,010Wh against 1,024Wh, 10,000 rated cycles against 3,000, a 3,000W peak against 2,700W, and a rated β€10ms switchover against β€20ms, at $700. Two things keep that short of a lock. Its field record is weeks old rather than monthsB0, and it clears our eight-hour blackout load with 63Wh of usable capacity left, which is minutes of margin rather than hours. The one load where the DELTA 2's inverter was genuinely the better one is a sustained draw above 1,500W, and the buyer who has that load should be looking at the DELTA 3, not at leftover stock.
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.
Sold on Amazon Β· todayβs price is on the listing
Written by Ian Schneider, Solar & Off-Grid Tester Β· Station Arena Test Desk Β· Updated September 19, 2026
Measured Data
Benchmark scores and the full spec record, side by side.
Benchmark scores
Not rated for both units (minimum threshold unmet): RV Living, Food Truck.
Full specifications
α΅ Derived: price Γ· rated capacity. See the data behind our comparisons β
Comparison ToolAdd more power stations, side by sideOpen Tool βHow these numbers are produced
Numeric verification
Every figure on this page traces to our spec database or arithmetic on it β no estimated numbers.
Owner claims
Statements about owner experience are cited to published reviews β see Sources & Research Notes below.
Runtime model
Runtime = (rated capacity Γ 0.85 inverter efficiency) Γ· 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 βClass ranking (the star rating)
Each unit's star score is a category ranking, not customer reviews β 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 5β . Here, DELTA 2 rates 4.1/5 (50th percentile of 27 Everyday-class units), and SOLIX S2000 rates 5.0/5 (99th percentile of 26 Large-class units).
How the class ranking is computed βTest Notes & Caveats
Hidden gotchas and advantages we spotted that you won't find on the product page.
DELTA 2: 50dB Published
50dB is about as loud as moderate rainfall. The SOLIX S2000 is rated 30dB β lower, but published by a different maker measuring its own way, so the two figures are not a like-for-like gap. For most people, fan noise around 45dB and up is where sleep starts to suffer.
SOLIX S2000: Fixed Capacity
The SOLIX S2000 is sealed at 2,010Wh, and that is the ceiling. Normally the counterpoint would be that the DELTA 2 can add expansion batteries, but that isn't a live option here: the DELTA 2 is no longer sold, and EcoFlow points owners to the DELTA 3. For a new purchase the expansion question doesn't arise between these two, so the SOLIX S2000's fixed 2,010Wh is simply what you get.
Surge: the 300W that changes hands twice
The same 300W moves in both directions here. The DELTA 2 carries 300W more continuously, 1,800W against 1,500W, and the S2000 peaks 300W higher, 3,000W against 2,700W. Motors pull two to three times their rated draw for an instant, so the Anker's 2Γ cushion clears the usual rule of thumb where the DELTA 2's 1.5Γ doesn't, and the ceiling that decides whether a compressor starts is the Anker's. Check the startup draw of the heaviest thing you own against both figures rather than assuming the DELTA 2 trips, because 2,700W is still a lot of headroom.
UPS Switchover: β€10ms vs β€20ms
Both list a UPS mode, at different rated speeds. The SOLIX S2000 is rated β€10ms β quick enough on paper that desktop PCs and routers should ride through, treating that as the rating it is. The DELTA 2 is rated β€20ms β 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: identical, whatever the math suggests
Five years each, so coverage decides nothing here. The per-dollar version of this comparison needs two live prices and this page has one, which is reason enough to leave it alone. Same terms, same length, no tiebreaker.
Battery Lifespan in Real Years
The SOLIX S2000 is rated for 10,000 cycles vs 3,000. In real life: at daily use, that's 27.4 vs 8.2 years. At weekend use (twice a week), it's 96 vs 29 years. One caution reading years across different sizes: a cycle is 2,010Wh on the SOLIX S2000 and 1,024Wh on the DELTA 2, so count lifetime energy β roughly 20,096 kWh against 3,072 kWh over the rated life. After hitting the cycle limit, the battery doesn't die β it drops to ~80% of original capacity, which is still very usable.
Full record above β the Test Desk pick is the SOLIX S2000.
Check SOLIX S2000 price βOwnership Analysis
What happens after you buy β 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
β warranty ends Β· Reaching the cycle rating means ~80% capacity remains β degraded, not dead.
Analyst note
The DELTA 2 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 S2000 works out at $0.03/kWh over its rated life. If you already own the DELTA 2, the hardware comparison still holds: over its rated life the DELTA 2 delivers about 3,072 kWh and the SOLIX S2000 about 20,096 kWh.
Brand trust
EcoFlow
Ecosystem
Largest in portable power β 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 β 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 β Reddit r/Ecoflow_community (~31K members), multiple Facebook groups, and an official community forum
App experience
Rated 4.6/5 iOS (~8,400 ratings) Β· 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 β flagship paths, not line-wide features.
Worth knowing
Tested subscription paywalls for advanced app features in early 2025 before community backlash paused the plan. No parts or service offered out of warranty.
Anker
Ecosystem
7-8 SOLIX portable power stations across C-series (compact) and F-series (flagship), plus the X1 home energy system
Support
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 β 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) Β· 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 β the S2000, F2600 and C1000 are among the better buys per watt-hour in the catalog.
Worth knowing
Anker's SOLIX support is the thing to watch. The parent brand built its name on no-hassle replacements, but recent reports describe AI-driven agents answering generically and awkward return logistics for heavy units, which ship as hazmat. None of that changes the hardware. It changes how annoyed you'll be if you ever need help with it.
Analyst note
EcoFlow has the deeper catalogue and the larger community, which normally counts for something. It counts for less here, because the EcoFlow unit in this comparison has left the range and an ecosystem argument only reaches buyers of current models. Anker's line is narrower, and its SOLIX support appears to be sliding from an excellent baseline. Judge these two on the hardware, then judge the brands on the one you can actually order.
Growth path
DELTA 2
EXPANDABLESupports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit β 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 S2000
FIXED CAPACITYFixed at 2,010Wh β a sealed, complete system rather than a starting point. There's no expansion port, so that figure is the ceiling: check it against your longest unplugged stretch before you buy.
Accepts up to 400W 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 β see methodology
Analyst note
Growth only counts if you can still buy in, and the DELTA 2 is no longer sold (EcoFlow points owners to the DELTA 3). That leaves the SOLIX S2000: it is sealed at 2,010Wh, so buy the size that covers you now. The DELTA 2's expandability still matters if you already own one, but it isn't a reason to pick it over the SOLIX S2000.
What Owners Report
Patterns from published owner reports and long-term reviews β every claim cited to its source below.
EcoFlow DELTA 2
The DELTA 2 has been out long enough for genuine multi-month field data, and the consensus is dull in the best way: reliable, good value, with one recurring gripeA0. An 18-month run through multiple outages, camping trips and daily home-office use came back praising the fast charging, the LiFePO4 chemistry and the expandabilityA3.
The gripe is the fan. It triggers at anything above 120W, and at full load, 1,500 to 1,800W, runs continuously at about 48 to 55dB, which is why powering medical equipment above 120W in a bedroom means either listening to it or running an extension cord out of the roomA1. At 1,200W of charging it's been likened to a gaming laptop, with the app's charge-rate slider as the fixA2. EcoFlow said it intended to address the noise in a firmware update, as it has on other modelsA4; our record doesn't show that closed out.
βWhen charging at 1200W the fans sound like a gaming laptop, though you can lower the charging speed in the app to silence it.β
Sources
portablepowerlab.com
Anker SOLIX S2000
The S2000's record is early rather than thin. It launched in June 2026, so nothing is measured in months and no longevity reports exist yet, but two outlets ran real hands-on tests instead of rewriting the press kitB0. Both found it silent at idle with fans only under heavy load or the fastest charging modeB1B2, and both separately measured single-digit standby draw: about 6W with the AC ports on but unused, about 2W with everything offB3B4. One left it charged and idle for 10 hours with AC output enabled and watched it drop only to 99%B3.
The useful figures are the recharge and the catches. Wall recharge on a 20-amp household circuit hit 80% in about 1.2 hours and full in about 1.7, matching what Anker claimsB5. A fridge plus assorted kitchen gadgets ran more than 60 hours on one chargeB12, and a simulated outage passed without connected office equipment noticing the switchoverB9. Against that, both outlets independently called out the carry handle as awkward for one-person transport at 35.7 lbsB7B8, and one noticed a warm-electronics smell within a few feet during the first hours of sustained load in a closed office, gone after a dayB6.
βFans only spin up under real load or fast charging, and at idle the unit is silent.β
Sources
ess-news.com Β· geardiary.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 Β· 3 entries]
- Two independent hands-on reviews both found near-silent idle operation, with fans spinning up only under heavy load or the fastest charging mode. [SOLIX S2000 Β· 2 entries]
- OptiSave's low-idle-draw claim held up under independent testing, with both reviewers separately measuring single-digit-watt standby draw. [SOLIX S2000 Β· 2 entries]
- Both reviewers praised fast, reliable UPS switchover that connected electronics didn't notice. [SOLIX S2000 Β· 2 entries]
- Despite otherwise solid build quality, reviewers from two different outlets independently flagged the single/absent carry handle as awkward for one-person transport. [SOLIX S2000 Β· 2 entries]
- A1
βFans trigger at anything above 120 watts; at maximum load (1,500β1,800W) they run continuously at ~48β55 dB. Powering medical equipment above 120W in a bedroom means listening to the fans or running an extension cable out of the room.β
portablepowerlab.com β EcoFlow Delta 2 Review: 6 Months of Real Use; PCWorld β EcoFlow Delta 2 review Β· 2026 Β· [negative]
- A2
βWhen charging at 1200W the fans sound like a gaming laptop, though you can lower the charging speed in the app to silence it.β
PCWorld β EcoFlow Delta 2 power station review Β· 2026 Β· [mixed]
- A3
βAfter 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.β
portablepowerlab.com β EcoFlow Delta 2 Review: 6 Months of Real Use Β· 2026 Β· [positive]
- A4
βEcoFlow officials indicated they plan to address the fan noise in an upcoming firmware update, as they have for other models after release.β
portablepowerlab.com β EcoFlow Delta 2 Review Β· 2026 (dated claim β may be partially addressed) Β· [mixed]
- B1
βFans only spin up under real load or fast charging, and at idle the unit is silent.β
ess-news.com β Anker Solix S2000 review: 2 kWh power station built for the long haul Β· 2026-05 Β· [positive]
- B2
βThe fans only spin up when pulling a heavy load or using the fastest charging mode β otherwise it stays very quiet.β
geardiary.com β Anker SOLIX S2000 Review Β· 2026-07 Β· [positive]
- B3
βCharged fully, disconnected from wall power with AC output enabled and no loads attached, then monitored for 10 hours: state of charge dropped only to 99%, implying about 2W average draw β matching Anker's spec.β
ess-news.com β Anker Solix S2000 review: 2 kWh power station built for the long haul Β· 2026-05 Β· [positive]
- B4
βWith AC ports on but unused, consumption is about 6W; with everything disabled it drops to just 2W.β
geardiary.com β Anker SOLIX S2000 Review Β· 2026-07 Β· [positive]
- B5
βReal-world recharge from a standard 20-amp household circuit hit 80% in roughly 1.2 hours and full capacity in about 1.7 hours, matching the manufacturer's claims.β
ess-news.com β Anker Solix S2000 review: 2 kWh power station built for the long haul Β· 2026-05 Β· [positive]
- B6
βUnder sustained AC load in a small, closed home office there was a slight warm-electronics smell within a few feet of the unit during the first several hours of operation; it faded after one day with no safety concern.β
ess-news.com β Anker Solix S2000 review: 2 kWh power station built for the long haul Β· 2026-05 Β· [mixed]
- B7
βAt 35.7 lbs the weight is manageable but noticeable β a second handle would be welcome for carrying it up stairs.β
ess-news.com β Anker Solix S2000 review: 2 kWh power station built for the long haul Β· 2026-05 Β· [mixed]
- B8
βLacks a dedicated handle for carrying with one hand, making transport less convenient despite the relatively compact 35.7 lb weight.β
geardiary.com β Anker SOLIX S2000 Review Β· 2026-07 Β· [negative]
- B9
βIn a simulated outage, connected office equipment rode through the switchover without interruption.β
ess-news.com β Anker Solix S2000 review: 2 kWh power station built for the long haul Β· 2026-05 Β· [positive]
- B12
βEasily powered a fridge and various kitchen gadgets for over 60 hours without needing a recharge.β
geardiary.com β Anker SOLIX S2000 Review Β· 2026-07 Β· [positive]
Research compiled September 19, 2026.
What Owners Actually Report
Drawn from 175 comments on independent review channels β not from retailer reviews, which skew to the first week of ownership. Each line is our summary of one commenter's claim, linked to the original. We record what they said, including where it contradicts the spec sheet.
EcoFlow DELTA 2
224 claims from 155 comments Β· 178 from owners Β· 60 with figures
- Runtime
- 32 Β· 13% negative
- Price & value
- 38 Β· 4% negative
- Charging
- 17 Β· 23% negative
- Durability
- 22 Β· 67% negative
- Warranty & support
- 22 Β· 59% negative
What owners complain about
Ignores solar unless he unplugs it from the wall, so he switched to the AC180.
Solar inputowner63 agreedsource β
His Delta 2 went bad three months after purchase and EcoFlow agreed it was defective.
Durabilityownerafter 3 months236 agreedsource β
Past 30 days the five-year warranty only gets a refurbished unit covered for 30 days.
Warranty & supportowner236 agreedsource β
What owners praise
DELTA 2 plus extra battery and 600W solar cost ~$1200 and paid for itself in under 2 years in California.
Price & valuemeasuredowner736 agreedsource β
Batteries still hold 98%+ capacity, ahead of the 80%-at-10-years warranty curve.
Durabilitymeasuredowner736 agreedsource β
Gets 180-190W into it from a 100Ah LiFePO4 via XT60i cable, no converter needed.
Chargingmeasuredowner106 agreedsource β
Anker SOLIX S2000
27 claims from 20 comments Β· 8 from owners Β· 4 with figures
- Price & value
- 5 Β· 5% negative
- Runtime
- 5 Β· 0% negative
- Solar input
- 4 Β· 42% negative
- Size & weight
- 1 Β· 0% negative
- Other
- 5 Β· 38% negative
What owners complain about
First-boot firmware update needs wifi but powers off connected devices, so it can't back a router.
UPS switchoverowner1 agreedsource β
Output voltage visibly dropped around 30% state of charge, which he says is not good.
Build qualitysource β
Only a single 400W solar input instead of dual 500W inputs is a drawback.
Solar input3 agreedsource β
What owners praise
Bought two Anker S2000s direct at $600 each plus tax for 2 kWh apiece.
Price & valuemeasuredowner3 agreedsource β
S2000 weighs 10 lb less than his AC180 while carrying nearly twice the capacity.
Size & weightmeasuredowner3 agreedsource β
With a 420W panel it stayed at 100% most of the day while running a fridge.
Solar inputmeasuredownersource β
Claims are weighted by how specific they are, whether the commenter owns the unit, and how many readers agreed. Comments that mention a product under a rival's review count for more, because the commenter had no reason to be there. This is what buyers report, not our test results β for measurements we ran ourselves, see the methodology.
Who Should Buy Which
Buy the DELTA 2 if youβ¦
- βYou already own one: keep it. 3,000 cycles is 8.2 years at daily use, its 1,800W output is still the higher continuous rating on this page, and an 18-month test through outages, camping and home-office duty turned up nothing that argues for replacing it earlyA3.
- βYou've found one sitting on a retailer's shelf and the heaviest thing you run is a sustained draw above 1,500W. That is the single axis where this unit beats the live one, so know that's what you're paying for. EcoFlow's own answer for that buyer is now the DELTA 3.
- βYou're comparing because you want to understand what the DELTA 2 was: 1,024Wh and 1,800W in a 27 lb body, 6 AC sockets and 4 USB-A ports, expandable, rated β€20ms on switchover. Good unit. Not a purchase.
Buy the SOLIX S2000 if youβ¦
- βThe outage buyer. Our eight-hour load is 1,645Wh and the S2000 is the only unit here that finishes it, with 63Wh to spare and a rated β€10ms switchover that one simulated-outage test saw connected office gear ride through without interruptionB9.
- βAnyone whose heaviest appliance has a compressor in it. A 3,000W ceiling over a 1,500W rating is the widest startup cushion on this page.
- βThe person who'll cycle it constantly for years. 10,000 rated cycles is 27.4 years at daily use, and the cells retire to about 80% of original capacity rather than to the curb.
- βThe desk or bedside user who wants nothing audible when nothing is happening. Two independent tests found it silent at idle, pulling about 2W with everything switched offB1B2B3B4.
If neither fits
Van life, or anything solar-only for days on end. That load is 4,685Wh a day and the S2000 is 2,977Wh short of it, while its 400W solar ceiling needs about five hours of strong sun to put 2,010Wh back. That calls for a bigger station with a higher solar input, or two of them, not a choice between these. Skip both as well if your load sits above 1,500W continuously for long stretches, since the only unit here rated for that is the one you can't buy.
The Bottom Line
Buy the Anker SOLIX S2000. EcoFlow has retired the DELTA 2, so the comparison has one live candidate, and the live candidate happens to be the better box: 2,010Wh against 1,024Wh, more than three times the rated cycles, and the higher surge ceiling at 3,000W that the spec sheets used to hand to the other side.
The DELTA 2 keeps its 27 lb body and its 300W of extra continuous output, and if a sustained draw above 1,500W is genuinely your load, take that to the DELTA 3 rather than to a hunt for leftover stock. Everyone else: the S2000 finishes the outage, idles silently, and is rated to still be doing it in twenty-seven years.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Is the EcoFlow DELTA 2 discontinued?
Yes. EcoFlow no longer sells it, and its store page now forwards to the DELTA 3, which the company treats as the like-for-like replacement. Retailer stock can outlast a discontinuation, so you may still find one for sale, but there's no maker price on this page for that reason. If you already own a DELTA 2, nothing about it stopped working.
Does the Anker SOLIX S2000 have more surge power than the DELTA 2?
Yes, on both readings. It peaks at 3,000W against the DELTA 2's 2,700W, and that peak sits over a 1,500W continuous rating, a 2Γ cushion against the DELTA 2's 1.5Γ over 1,800W. The trade is that the DELTA 2 carries 300W more continuously, so a sustained draw above 1,500W is the one place its inverter was the better one.
Will the SOLIX S2000 get a house through an eight-hour outage?
On the load we model, yes, but without room to spare. That load is 1,645Wh and the S2000 has 1,708Wh usable after the flat 15% conversion allowance, so it lands with 63Wh left. One reviewer ran a fridge and assorted kitchen gadgets for more than 60 hours on a charge, which is a much lighter draw than a full eight-hour house list. If your list is longer than ours, size up.
Is the DELTA 2's expandability better than a sealed 2,010Wh?
Only if you'd actually pass 2,010Wh. The DELTA 2 starts at 1,024Wh, so the first expansion battery largely buys capacity the S2000 already includes, and you'd be adding that hardware to a base unit EcoFlow has stopped selling. Past 2,010Wh the argument reverses, and at that point the place to have it is EcoFlow's current line rather than this page.
Which one is quieter, the DELTA 2 or the SOLIX S2000?
The published ratings don't answer it, because the two makers don't measure the same way and neither figure describes a light load. What was observed does: the DELTA 2's fans trigger above 120W and run around 48 to 55dB at full load, while two independent hands-on tests of the S2000 found it silent at idle with fans spinning up only under heavy load or fastest charging. At a CPAP's 40W, neither should be a problem.
Where to buy
EcoFlow DELTA 2
No longer sold
Anker SOLIX S2000Pick
Sold on Amazon Β· todayβs price is on the listing
Prices may vary by retailer and are subject to change.