Head-to-head test
EcoFlow DELTA 3800 Gen4 vs Anker SOLIX S2000Five Times the Solar Input, and It Grows. Worth the Step Up?
Five times the S2000's solar input and a port for extra batteries make the DELTA 4 (3800) the start of a home system. I'd buy the S2000, unless you're building one.
Black Friday Β· 23 days out
Price to beat:SOLIX S2000 $650
The lowest we have recorded. A Black Friday price above it is a sale this unit has already had.
Full profiles: EcoFlow DELTA 3800 Gen4 β Β· Anker SOLIX S2000 β
Written by Gunner GustafsonUpdated
Whole-Home Backup Tester, Station Arena Test Desk
Spec deltas
Gunnerβs take
Whole-Home Backup Tester
The DELTA 4 (3800) takes five times the solar the S2000 does.
It accepts 2,000 W across two inputsA5 against the S2000's 400 W. With that much panel it could refill its 3,763 Wh in about two hours of strong sun, while the S2000 needs most of a sunny day to refill its smaller battery.
It also keeps growing after you buy it.
The DELTA 4 (3800) takes up to two extra batteries, and EcoFlow quotes 4 to 12 kWh in allA6. The S2000 is sealed at 2,009.6 Wh. Whatever job you buy it for is the job it does for good.
The catch is everything else.
EcoFlow lists the DELTA 4 (3800) at $2,199 against $700 for the S2000. It weighs 67.5 lb against 35.7 lb, and it ships in late NovemberA10. The S2000 is on sale now and still the cheaper battery to own.
What the Numbers Reveal
Each conclusion stated first β the numbers behind it on one line, the full analysis below.
Capacity
EcoFlow sells the DELTA 4 (3800) with a DELTA 3 Max Plus extra battery as a 6 kWh kitA10, which clears that day with room left. The S2000's only growth path is a second S2000 with its own outlets and its own inverter, which means two boxes to manage instead of one.
SOLIX S2000: sealed at 2,009.6 Wh, no expansion portDELTA 4 (3800): 3,763 Wh, up to two extra batteries, 4 to 12 kWh by EcoFlow's figureA6Van Life Daily needs 4,685 Wh: the DELTA 4 (3800) is 1,486 Wh short, the S2000 2,977 Wh short
Why it mattersIf your needs might climb past 3,763 Wh, the S2000 is a dead end and the DELTA 4 (3800) isn't.
solar input
With 2,000 W of panels on it, the DELTA 4 (3800) can put back its whole battery in about two hours of strong sun, so a week of patchy weather has a fair chance of never getting ahead of it. The S2000 at 400 W is fine until the one good day turns cloudy. That gap only exists if you buy the panels, and 2,000 W is a lot of panel.
SOLIX S2000: 400 W solar inputDELTA 4 (3800): 2,000 W solar across two inputs, 11 to 60 V eachA58-Hour Blackout: the S2000 ends with 63 Wh, the DELTA 4 (3800) with 1,554 Wh, 94% of a second night
Why it mattersIf you plan to ride out multi-day outages on solar, the DELTA 4 (3800) keeps up and the S2000 doesn't.
rated cycles
Spread each price over that lifetime energy and the S2000 comes to $0.03 a kWh against $0.10. As a place to store energy, the S2000 is far cheaper. What the DELTA 4 (3800)'s price buys is the solar inputs, the bigger inverter and the battery port.
$2,199 against $700SOLIX S2000: 10,000 rated cycles; DELTA 4 (3800): 6,000A9Lifetime energy: 22,578 kWh against 20,096 kWh
Why it mattersIf all you need is stored energy, buy the S2000. Pay for the DELTA 4 (3800) only if you'll use what the S2000 lacks.
The specific dimensions that decide these two units β everything else is a tie.
Growth Path
Selected because: The S2000 is sealed at 2,010 Wh. The DELTA 4 (3800) takes extra batteries.
solar input
The battery port is the reason to look at the DELTA 4 (3800) at all. It takes up to two extra batteries through EcoFlow's adapter, either the DELTA Pro 3 battery or the DELTA 3 Max Plus batteryA6. The S2000 has no port, so 2,009.6 Wh is its last word.
I'd only pay for that port with a plan for it. A transfer switch feeding the fridge, the furnace blower and the sump pump in a house that loses power for days is a plan. A box for camping and the odd storm isn't, and the S2000 does that job for a fraction of the price.
Your Life, Your Pick
Selected because: Both get through one 1,645 Wh blackout night. Only one has most of a second night left.
The second night of an outage is where these two part ways. Both get through the 1,645 Wh blackout night. The S2000 ends it with 63 Wh left, and the DELTA 4 (3800) ends it with enough for 94% of another.
It also runs loads the S2000 can't. The DELTA 4 (3800) puts out 3,600 W from 120 V outletsA2 against the S2000's 1,500 W. A fridge and lights fit under either. A space heater and a microwave together fit under one.
Lifetime Value
Selected because: The S2000 is rated for 10,000 cycles against 6,000 and is the cheaper battery to own.
cost / lifetime kWh
The S2000 is still the cheaper battery to own. Spread each price over the energy its rated cycles deliver and it comes to $0.03 a kWh against $0.10 for the DELTA 4 (3800). Anker rates it for 10,000 cycles against 6,000.
The DELTA 4 (3800) does hand over more energy in total. Its bigger battery is rated to deliver 22,578 kWh against 20,096 kWh, so it outlasts the S2000 in kilowatt-hours if not in years. That's a thin edge to pay this much for.
Portability & Form Factor
Selected because: 67.5 lb against 35.7 lb: nearly twice the weight for nearly twice the battery.
weight
At 67.5 lb, the DELTA 4 (3800) is a two-hand lift. EcoFlow gives it a handle at each end and sells a folding cart separatelyA7. The S2000 weighs 35.7 lb, though two reviewers wished it had a better carrying handleB7B8.
For a box that stays home, I'd let the weight go. One that lives beside the panel gets lifted once. If it goes camping every month, I'd take the S2000 and not think twice.
In the makersβ pictures
What youβd actually be living with
Every port, labelled
What plugs in where, and how much it takes
EcoFlow DELTA 3800 Gen4
Front panel
- 1USB-C Β· 140 WOutUp to 140 W (USB-PD up to 28 V at 5 A). The port for a laptop.
- 22Γ USB-C Β· 65 WOutUp to 65 W each. EcoFlow says these two and the USB-A share 16 W when two or more are in use at once.
- 3USB-A Β· 36 WOutUp to 36 W (5, 9 or 12 V at 3 A).
- 430 A twist-lockOutA three-slot twist-lock marked 30A MAX, rated 30 A at 120 V on the US unit.
- 54Γ 20 A outletsOutFour T-slot 120 V outlets rated 20 A each, sharing 3,600 W continuous and a 7,200 W surge.
Photo: EcoFlow Β· Product image, EcoFlow Japan store Β· numbers and labels are ours. Ratings from EcoFlowβs US spec table; outlet shapes read by us from EcoFlowβs picture, taken of the Japanese unit, which shares the US panel.
Input side
- 12Γ Solar/DC in Β· 1,000 WInTwo inputs, each 11 to 60 V, up to 20 A, 1,000 W: 2,000 W of panels in all.
- 2AC in Β· 1,800 WIn100β120 V at 15 A. Charges at up to 1,800 W, which at 120 V is the whole of an ordinary 15 A circuit.
- 3Battery portIn Β· OutTakes up to two of EcoFlowβs DELTA 3 Max Plus or DELTA Pro 3 extra batteries; EcoFlow quotes 4β12 kWh.
Photo: EcoFlow Β· Product image, EcoFlow Japan store Β· numbers and labels are ours. Ratings from EcoFlowβs US spec table and the panelβs own printing.
Anker SOLIX S2000
Front panel, port row
- 1USB-A Β· 12 WOutUp to 12 W. It shares an 18 W limit with the 15 W USB-C, as printed on the panel and in Ankerβs spec table.
- 2USB-C Β· 15 WOutC1, up to 15 W, inside the 18 W it shares with the USB-A port.
- 3USB-C Β· 100 WOutC2, up to 100 W.
- 4Solar in Β· 400 WInAn orange two-pin input printed SOLAR IN. Ankerβs spec table gives 400 W max of solar.
Left of the USB ports, a button printed AC; right of the solar input, a RESET hole and the power button. The screen sits below this row.
Photo: Anker Β· Product image, Anker SOLIX store Β· numbers and labels are ours. Ratings printed on Ankerβs panel and in Ankerβs US S2000 spec table (ankersolix.com/products/s2000-portable-power-station).
Front outlets
- 13Γ AC outletsOutThree household outlets, NEMA 5-15 by their shape. All five AC outlets share 1,500 W continuous and a 3,000 W peak, by Ankerβs page.
Photo: Anker Β· Product image, Anker SOLIX store Β· numbers and labels are ours. Outlet type read by us from Ankerβs picture; the count and the totals from Ankerβs US S2000 spec table and page (ankersolix.com/products/s2000-portable-power-station).
Rear panel
- 12Γ AC outletsOutTwo more household outlets, NEMA 5-15 by their shape, inside the same 1,500 W.
- 2AC in Β· 1,600 WInThe AC charging inlet: 1,150 W by default, 1,600 W in UltraFast mode, which is switched on in the Anker app.
No battery port: Anker says the S2000 doesnβt take extra batteries, and it has no 12 V car socket.
Photo: Anker Β· Product image, Anker SOLIX store Β· numbers and labels are ours. Outlet type read by us from Ankerβs picture; charging figures from Ankerβs US S2000 spec table (ankersolix.com/products/s2000-portable-power-station).
Strengths & trade-offs
EcoFlow DELTA 3800 Gen4
Strengths
- +Larger battery capacity
- +Higher AC output
- +Faster solar charging
Trade-offs
- βSubstantially more expensive (+$1,499) than the SOLIX S2000.
- βSignificantly heavier (+31.8 lbs), making it harder to move.
- βShorter-lived battery β rated for 6,000 charge cycles vs the SOLIX S2000's 10,000, so it wears out sooner.
Anker SOLIX S2000
Strengths
- +Costs $1,499 less
- +Lighter by 31.8 lb
- +Rated for 10,000 charge cycles β much longer battery lifespan
Trade-offs
- βWeaker inverter (-2,100W) limits appliance compatibility.
- βSealed capacity β the DELTA 3800 Gen4 can add batteries to grow past 2,009.6Wh; 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 Β· 2 nights Β· needs 2,100Wh
Weekend Camping
Two nights off-grid with essential comfort
DELTA 3800 Gen4
The S2000 runs out 392 Wh short of the 2,100 Wh weekend. The DELTA 4 (3800) finishes with 1,099 Wh left, though at 67.5 lb it's the heavier one to haul to the site.
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
DELTA 3800 Gen4
Both get through the night. The S2000 ends it with 63 Wh, the DELTA 4 (3800) with 1,554 Wh, enough for 94% of a second night.
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 several times 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 3800 Gen4 40dB, but the SOLIX S2000's is its maker's best case and the DELTA 3800 Gen4's is EcoFlow's maximum under heavy charge and discharge, so at a 40W draw the real gap can only be narrower than it looks, and may even run the other way. Neither settles which box is quieter at a bedside. Buy whichever is cheaper or easier to carry.
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
DELTA 3800 Gen4
The DELTA 3800 Gen4 clears the workday at 28% used, banking 2,289Wh β late work, extra calls, or a second laptop charge without arithmetic. The SOLIX S2000 at 53% also finishes, with 798Wh of slack for the unplanned.
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
DELTA 3800 Gen4
Both handle game day; the DELTA 3800 Gen4 keeps more in reserve (21% used vs 39%). Tailgating is a light load, though, so the number you'll feel is weight: 35.7 lbs for the SOLIX S2000 against 67.5 lbs for the DELTA 3800 Gen4, 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 holds 4,685 Wh on its own battery. The DELTA 4 (3800) can take extra batteries to close the gap. The S2000 can't.
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: DELTA 3800 Gen4 runs 15.6h vs 8.3h.
$2,199 list Β· direct from EcoFlow
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 0β213.2hComfort & Convenience
Makes off-grid life actually enjoyablescale 0β42.6hHigh-Draw Appliances
These reveal the real limitsscale 0β3.2hΒΉ 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
November 4, 2026
Verdict: the Anker SOLIX S2000
I'd buy the S2000 for a 2 kWh job, and the DELTA 4 (3800) only for backup that has to grow. The DELTA 4 (3800) takes 2,000 W of solar across two inputs against 400 W, runs 3,600 W against 1,500 W, and takes up to two extra batteriesA6, while the S2000 is sealed at 2,009.6 Wh. But the S2000 weighs 35.7 lb against 67.5 lb, it's on sale now while EcoFlow ships the DELTA 4 (3800) in late NovemberA10, and it costs $0.03 per lifetime kWh against $0.10. If you're setting up a house to ride out outages that last days, on solar, the call flips to the DELTA 4 (3800).
Editor-assigned confidence, based on cited owner research and spec analysis.
List prices as of November 4, 2026. The links below open EcoFlow's and Anker's current prices.
$729.99 Β· direct from Anker
Last checked 31 days ago. Prices move β check before you buy.
or check the DELTA 3800 Gen4 price$2,199.00 list
Written by Gunner Gustafson, Whole-Home Backup Tester Β· Station Arena Test Desk Β· Updated November 4, 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, CPAP, Food Truck, Camping.
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 3800 Gen4 rates 4.1/5 (48th percentile of 22 Home Backup-class units), and SOLIX S2000 rates 4.9/5 (96th percentile of 29 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.
67.5 lb on Two Handles
The DELTA 4 (3800) weighs 67.5 lb against the S2000's 35.7 lb. EcoFlow puts a handle at each end and sells a folding cart separately, so plan on a two-hand lift to the car and a cart for anything farther.
SOLIX S2000: Fixed Capacity
The SOLIX S2000 is sealed at 2,010Wh β fine if that covers you, but it's the ceiling. By contrast the DELTA 3800 Gen4 can add expansion batteries, though the first thing it has over the SOLIX S2000 is its own 3,763Wh base β expansion is the step after that, for the buyer who would outgrow 3,763Wh as well.
Warranty: No Difference
Both units carry the same 5-year warranty, so coverage isn't a tiebreaker here. The DELTA 3800 Gen4's figure is a maximum rather than a guarantee β it depends on registering the unit in the EcoFlow app, which adds two years to a three-year standard term. Worth saying because the per-dollar framing can suggest otherwise: the SOLIX S2000 works out at 7.1 years of cover per $1,000 spent against the DELTA 3800 Gen4's 2.3, but that spread is the price gap, not the terms.
Battery Lifespan in Real Years
The SOLIX S2000 is rated for 10,000 cycles vs 6,000. In real life: at daily use, that's 27.4 vs 16.4 years. At weekend use (twice a week), it's 96 vs 58 years. One caution reading years across different sizes: a cycle is 2,010Wh on the SOLIX S2000 and 3,763Wh on the DELTA 3800 Gen4, so count lifetime energy β roughly 20,096 kWh against 22,578 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 βor check the DELTA 3800 Gen4 priceOwnership 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 SOLIX S2000 wins on both sticker price and long-term value. At $0.03/kWh over its lifetime, it's meaningfully cheaper to own. Clear value winner. One caution on the lifespan row: the SOLIX S2000 takes longer to reach its cycle rating, but a cycle moves a different amount of energy on each unit β the DELTA 3800 Gen4 still delivers more over its shorter horizon (22,578 vs 20,096 kWh). Years measure wear, not usefulness.
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
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 positions itself as a mid-to-premium brand with stronger support infrastructure, while Anker competes on value. The question is whether the EcoFlow ecosystem and support premium is worth it for your use case.
Growth path
DELTA 3800 Gen4
EXPANDABLESupports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit β useful if your needs may climb past 3,763Wh.
Accepts up to 2,000W of solar. Enough for a serious multi-panel array.
Adequate ports for most setups, but heavy users may want a power strip.
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
The SOLIX S2000 is sealed at 2,010Wh, which is fine if that covers you. The DELTA 3800 Gen4 starts at 3,763Wh and can grow beyond it with EcoFlow expansion batteries β real headroom the SOLIX S2000 doesn't have if your needs climb toward partial-home backup.
What Owners Report
Patterns from published owner reports and long-term reviews β every claim cited to its source below.
EcoFlow DELTA 3800 Gen4
Nobody has a DELTA 4 (3800) at home yet. EcoFlow opened sales on November 4 and ships in late NovemberA10, so this side of the page runs on EcoFlow's US listing and our arithmeticA1A5A6.
The test I'd want is a cloudy week. Hypothetically, I'd hang 2,000 W of panels on its two inputsA5, run a fridge and a furnace blower through a transfer switch for three days of patchy sun, and see whether the battery ever climbs back to full. That's the job that justifies the step.
βCapacity 3,763 Wh, LFP (LiFePO4) cells. EcoFlow sells it as the DELTA 3800 Gen4; buyers and the press call the pair the DELTA 4.β
Sources
us.ecoflow.co Β· jp.ecoflow.co
Anker SOLIX S2000
Reviewers found the S2000 does the basics quietly and well. The fans stay off until a heavy load or the fastest chargingB1B2, office gear rode through a simulated outageB9B10, and one reviewer refilled it from a 20 A household circuit in about 1.7 hoursB5.
The complaints are small. One noticed a faint warm-electronics smell in the first hours under load that faded within a dayB6, and another called Anker's app the more polished one in its classB11. It launched in JuneB0, so this is weeks of evidence, not years.
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
- Launch-day ledger: every entry is EcoFlow's own US store and documentation, or our labelled arithmetic. No owner or reviewer evidence exists yet. [DELTA 3800 Gen4 Β· 12 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
βCapacity 3,763 Wh, LFP (LiFePO4) cells. EcoFlow sells it as the DELTA 3800 Gen4; buyers and the press call the pair the DELTA 4.β
EcoFlow US store, us.ecoflow.com/products/delta-3800-gen4 (spec table, features and FAQ, read 2026-11-04) Β· 2026-11-04 Β· [mixed]
- A2
βUS unit: 120 V AC, 60 Hz; rated 3,600 W continuous with a 7,200 W surge. It supports X-Boost (EcoFlow refers to the manual for the US X-Boost figure); X-Boost is unavailable while the unit charges from the wall or runs in bypass.β
EcoFlow US store, us.ecoflow.com/products/delta-3800-gen4 (spec table, features and FAQ, read 2026-11-04) Β· 2026-11-04 Β· [mixed]
- A5
βSolar: two inputs, 11β60 V DC at up to 20 A and 1,000 W each, 2,000 W total (XT60i; two XT60i-to-LP60 cables are in the box). EcoFlow lists six charging methods; its 800 W Alternator Charger is limited to 500 W through the Solar/DC port.β
EcoFlow US store, us.ecoflow.com/products/delta-3800-gen4 (spec table, features and FAQ, read 2026-11-04) Β· 2026-11-04 Β· [mixed]
- A6
βExtra Battery Port: up to two extra batteries through EcoFlow's Smart Extra Battery Expansion Adapter. Compatible: the DELTA Pro 3 Smart Extra Battery and the DELTA 3 Max Plus (2,048 Wh) Smart Extra Battery. EcoFlow quotes 4β12 kWh of expandable capacity.β
EcoFlow US store, us.ecoflow.com/products/delta-3800-gen4 (spec table, features and FAQ, read 2026-11-04) Β· 2026-11-04 Β· [mixed]
- A7
βWeight 67.5 lb (30.6 kg); 16.77 Γ 11.36 Γ 12.09 in without handles, 18.76 in long with them. A handle at each end; EcoFlow sells a folding transport cart separately ($109 at launch, listed at $199). EcoFlow calls it the smallest and lightest portable power station in its class (3β4 kWh and 3,600 W).β
EcoFlow US store, us.ecoflow.com/products/delta-3800-gen4 (spec table, features and FAQ, read 2026-11-04) Β· 2026-11-04 Β· [mixed]
- A9
βRated for 6,000 cycles (EcoFlow: "15+ years"). Charges at 32β113Β°F (0β45Β°C), runs at 14β113Β°F (β10β45Β°C). Wi-Fi and Bluetooth with the EcoFlow app. Warranty: 3 years plus a 2-year extension when registered in the EcoFlow app.β
EcoFlow US store, us.ecoflow.com/products/delta-3800-gen4 (spec table, features and FAQ, read 2026-11-04) Β· 2026-11-04 Β· [mixed]
- A10
βOn sale at us.ecoflow.com from November 4, 2026 at $2,199; EcoFlow says it ships in late November. Kits: with two 160 W solar panels $2,899; with a DELTA 3 Max Plus extra battery (6 kWh in all) $2,999. EcoFlow also sells it in Japan, where it went on sale October 30 at Β₯240,900.β
EcoFlow US store, us.ecoflow.com/products/delta-3800-gen4 (spec table, features and FAQ, read 2026-11-04) Β· 2026-11-04 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]
- 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]
- B10
βA 10ms switchover time means a computer or internet router won't even flicker if the grid goes down.β
geardiary.com β Anker SOLIX S2000 Review Β· 2026-07 Β· [positive]
- B11
βThe Anker app is the more polished entry in this category, with clear navigation and sensible defaults.β
ess-news.com β Anker Solix S2000 review: 2 kWh power station built for the long haul Β· 2026-05 Β· [positive]
Research compiled November 4, 2026.
Who Should Buy Which
Buy the DELTA 3800 Gen4 if youβ¦
- βYou're building backup that will grow. It takes up to two extra batteries, 4 to 12 kWh in all by EcoFlow's figureA6.
- βYou'll recharge from a big solar array. 2,000 W across two inputsA5 against the S2000's 400 W.
- βYour outages last days. It ends the 1,645 Wh blackout night with enough for 94% of a second.
- βYou run more than 1,500 W at once. It puts out 3,600 WA2.
Buy the SOLIX S2000 if youβ¦
- βA 2 kWh job is the whole job. Camping, a CPAP or a fridge through one night: the S2000 covers each for a fraction of the price.
- βYou'll carry it. 35.7 lb against 67.5 lb.
- βIt will cycle daily. Rated for 10,000 cycles against 6,000, it's the cheaper battery to own.
- βYou need it before late November. The S2000 is on sale now, and EcoFlow ships the DELTA 4 (3800) thenA10.
If neither fits
If all you power at camp is a CPAP and phones, skip both. A CPAP night uses 19% of the S2000 and 10% of the DELTA 4 (3800). A station half the S2000's size does that job for less and weighs less.
The Bottom Line
For a 2 kWh job, buy the S2000. It covers camping, a CPAP and one blackout night, weighs about half as much, and it's the cheaper battery to own by a wide margin.
Step up to the DELTA 4 (3800) only if you're building something. The solar inputs and the battery port make it the start of a home system, and the S2000 can never become one. If that's your plan, it's the step worth taking.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
How much is the DELTA 4 (3800) in the US, and when does it ship?
EcoFlow lists it at $2,199 on its US store. It went on sale on November 4, 2026, and EcoFlow says it ships in late November. The SOLIX S2000 sells for $700 and is on sale now.
Can I add batteries to the DELTA 4 (3800) or the SOLIX S2000?
Only to the DELTA 4 (3800). It takes up to two extra batteries, the DELTA Pro 3 battery or the DELTA 3 Max Plus battery, for 4 to 12 kWh in all by EcoFlow's figure. The SOLIX S2000 has no expansion port and stays at 2,009.6 Wh.
Which one charges faster from solar?
The DELTA 4 (3800), by a wide margin. It takes 2,000 W across two inputs at 11 to 60 V each, against 400 W for the SOLIX S2000. With enough panels it refills in about two hours of strong sun, while the S2000 needs about five.
Is the DELTA 4 (3800) worth it over the Anker SOLIX S2000?
Only if you'll use what the S2000 lacks: five times the solar input, 3,600 W of output against 1,500 W, and room for extra batteries. For camping, a CPAP or one night of backup, the S2000 does the job and costs far less to own, $0.03 per lifetime kWh against $0.10.
Which one is lighter?
The SOLIX S2000, at 35.7 lb against 67.5 lb for the DELTA 4 (3800). The DELTA 4 (3800) holds 3,763 Wh against 2,009.6 Wh.
Where to buy
EcoFlow DELTA 3800 Gen4
$2,199.00
$2,199.00 Β· direct from EcoFlow
Anker SOLIX S2000Pick
$729.99
$729.99 Β· direct from Anker
Last checked 31 days ago. Prices move β check before you buy.
Prices may vary by retailer and are subject to change.