Head-to-head test
EcoFlow DELTA 3 Ultra vs Anker SOLIX F3800 PLUS
Both units expand, so the SOLIX's growth path isn't what its $1,700 premium buys — that money buys 240V and 6,000W of whole-home output, and if you don't need those, the $1,199 DELTA 3 Ultra already does the rest.
Written by Gunner GustafsonUpdated
Whole-Home Backup Tester, Station Arena Test Desk
EcoFlow
DELTA 3 Ultra
5,362Power Score · The AC & Fridge Zone
$1,299.00 list · direct from EcoFlow
Anker
SOLIX F3800 PLUS
6,265Power Score · The AC & Fridge Zone
$2,499.99 list · direct from Anker
Spec deltas
The DELTA 3 Ultra costs $1,199 to the SOLIX F3800 PLUS's $2,899, and both units expand with add-on batteries — which reframes the whole comparison. The SOLIX's expandability, usually its headline advantage, isn't what you're paying the extra $1,700 for, because the cheaper EcoFlow grows too. You're paying for something more specific.
What you're paying for is output. The SOLIX delivers 6,000W continuous and 240V split-phase power that can back up an electrical panel — a well pump, a dryer, a range — where the DELTA 3 Ultra's 3,600W and 120V-only inverter cannot. It also takes 3,200W of solar to the EcoFlow's 1,600W, which matters if you're refilling a big array off-grid. For whole-home and off-grid builders, that's the case for the premium.
For the 120V buyer, the DELTA 3 Ultra quietly wins the rest. It costs $0.10 per lifetime kilowatt-hour to the SOLIX's $0.25, lasts 4,000 charge cycles to 3,000, delivers more total lifetime energy (12,288 kWh versus 11,520), switches over faster at 10ms, weighs 55 lb less, and publishes a quiet 30 dBA the SOLIX doesn't disclose. Take the SOLIX for 240V; take the DELTA 3 Ultra for everything short of it.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
The answer is output, not capacity or growth: 6,000W and 240V split-phase, the ability to drive a whole electrical panel and 240V appliances the 3,600W, 120V EcoFlow can't. That's the entire premium in one sentence — you're buying whole-home capability, and nothing else the SOLIX offers is exclusive to it.
DELTA 3 Ultra is expandable with add-on batteries; SOLIX F3800 PLUS is expandable tooDELTA 3 Ultra $1,199; SOLIX $2,899SOLIX unique capabilities: 6,000W output and 240V split-phase
Why it mattersIf there's no 240V load in your plan, the SOLIX premium is buying a capability you'll never switch on — take the expandable EcoFlow.
rated cycles
On daily-cycling duty, 4,000 cycles to 3,000 is roughly eleven years of life against eight, and the warranty-year cost tells the same story: $240 against $580. The SOLIX isn't just pricier to buy; it's pricier every year you own it and pricier per watt-hour it will ever store.
DELTA 3 Ultra: $0.10 per lifetime kilowatt-hour; SOLIX: $0.25DELTA 3 Ultra 4,000 charge cycles; SOLIX 3,000DELTA 3 Ultra delivers 12,288 lifetime kWh; SOLIX 11,520
Why it mattersA buyer who plans to cycle the unit daily saves twice with the EcoFlow — lower purchase price and more years before replacement.
A 10ms line-interactive handoff is the safer catch for a desktop or NAS mid-write, and a known 30 dBA is a known quiet; the SOLIX's 20ms is still fast but a step behind, and its silence on noise is a promise rather than a number. Same chemistry, same warranty — the EcoFlow just behaves better in the room with you.
DELTA 3 Ultra: 10ms UPS switchover, 30 dBA publishedSOLIX F3800 PLUS: 20ms switchover, noise not publishedBoth use LFP chemistry with a 5-year warranty
Why it mattersHome-office and bedroom users, who live beside the unit, should weight the faster UPS and published noise figure the EcoFlow offers.
The specific dimensions that decide these two units — everything else is a tie.
PowerScore Breakdown
Selected because: The SOLIX's 6,000W/240V output is the sole thing its premium uniquely buys — must be framed as the real decision point.
overall power score
This is where the SOLIX F3800 PLUS justifies itself, and it's the only place it needs to. Its 6,000W of continuous output and 240V split-phase capability back up a whole electrical panel — well pump, dryer, range — loads the DELTA 3 Ultra's 3,600W, 120V-only inverter physically cannot drive. Wired to a transfer switch, the SOLIX is a whole-home machine.
The DELTA 3 Ultra answers a smaller but far more common question. At 3,600W it starts and runs a fridge, a microwave, a heater, or a full circuit of 120V devices, with 7,200W of surge to swallow a compressor spike. If your backup list is appliances and electronics rather than a 240V panel, the EcoFlow's output is sufficient and the SOLIX's is horsepower you paid for and parked.
Growth Path
Selected because: Both expand, so this section's job is to defuse expandability as a differentiator — the freshest angle in the pair.
solar input
Expandability is usually the SOLIX's trump card, and here it isn't, because the DELTA 3 Ultra expands too. Both units take add-on batteries to grow their capacity, so the 'buy the one you can scale' argument applies equally to the cheaper EcoFlow. The one true difference in the growth story is solar: the SOLIX accepts 3,200W of input to the EcoFlow's 1,600W, which lets a large off-grid array refill it faster.
That solar ceiling is worth paying for if you're actually building toward off-grid living, where refill speed from panels is a survival spec, not a convenience. If you're not — if the unit charges from the wall and grows, at most, by one expansion battery — then both units grow the same way and the SOLIX's higher solar input is headroom you won't use. Expandability doesn't decide this matchup; the 240V question does.
Lifetime Value
Selected because: Cheaper to buy and own, longer-lasting — the value spine at the DELTA 3 Ultra's low $1,199 entry price.
cost / lifetime kWh
At $1,199 the DELTA 3 Ultra is the cheapest way into this class, and it stays the cheapest over time. It works out to $0.10 per lifetime kilowatt-hour against the SOLIX's $0.25 and carries a $240 warranty-year cost to the SOLIX's $580. Its 4,000 charge cycles outlast the SOLIX's 3,000, so even with a smaller battery it delivers more total lifetime energy — 12,288 kilowatt-hours to 11,520.
The SOLIX is more expensive on every axis time can measure: up front, per year, and per watt-hour delivered. None of that is a knock if you need its 240V output, because the EcoFlow can't do that job at any price. But if you don't, you're paying a premium to store less energy, for fewer years, at more than double the cost per unit.
Portability & Form Factor
Selected because: 55 lb and a two-person-vs-one-person lift separate a fixed install from a movable unit.
weight
The DELTA 3 Ultra weighs 77.2 lb to the SOLIX's 132.3 — a 55-pound gap that separates a heavy-but-manageable unit from a two-person install. Both roll on wheels with handles, but only the EcoFlow is something a determined adult moves alone; the SOLIX's wheels, reviewers note, balk at anything rougher than a smooth floor.
Where the unit lives decides how much that matters. A SOLIX bolted to a garage transfer switch never has to move again, and its weight is a one-day concern. A unit that goes camping, rides in an RV, or shuttles from a closet to the kitchen during an outage is one you'll lift and roll constantly — and there the EcoFlow's 55-pound advantage is felt every single time.
What the Specs Don't Tell You
Selected because: UPS speed and noise (both EcoFlow), surge (SOLIX), cycle life (EcoFlow) — the supporting-spec spread.
rated cycles
The supporting specs mostly favor the EcoFlow. Its 10ms UPS switchover beats the SOLIX's 20ms for desktops and sensitive gear, its published 30 dBA is a known-quiet number the SOLIX doesn't offer, and its 4,000 charge cycles outlast the SOLIX's 3,000. The one card that goes the SOLIX's way is surge: 9,000W of peak to the EcoFlow's 7,200W is more starting headroom for stubborn motor loads.
The SOLIX's undisclosed noise is worth a fair word. Field reports describe it as quiet under normal household loads and loud only above roughly four thousand watts or at full charge speed, so the missing number probably isn't hiding a problem. Still, the DELTA 3 Ultra prints its 30 dBA and reviewers back it up as genuinely quiet under sustained load — a promise kept beats a promise implied.
Strengths & trade-offs
EcoFlow DELTA 3 Ultra
Strengths
- +Costs $1,201 less
- +Lighter by 55.1 lb
- +Rated for 4,000 charge cycles — much longer battery lifespan
Trade-offs
- –Weaker inverter (-2,400W) limits appliance compatibility.
Anker SOLIX F3800 PLUS
Strengths
- +Larger battery capacity
- +Higher AC output
- +Faster solar charging
Trade-offs
- –Substantially more expensive (+$1,201) than the DELTA 3 Ultra.
- –Significantly heavier (+55.1 lbs), making it harder to move.
- –Very heavy unit that may be difficult for one person to lift.
- –Shorter-lived battery — rated for 3,000 charge cycles vs the DELTA 3 Ultra's 4,000, so it wears out sooner.
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
SOLIX F3800 PLUS
Both clear a 2,100Wh weekend with margin, so this is settled by the carry and the wallet. The DELTA 3 Ultra is 55 pounds lighter and $1,700 cheaper, and it covers the trip just as completely — an easy call for camping.
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
SOLIX F3800 PLUS
A 1,645Wh outage is comfortable for either unit on one charge. The EcoFlow's edges show at the margins: a 10ms UPS catch for sensitive gear and a published 30 dBA to sit beside, both a step better than the SOLIX for riding out an evening indoors.
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 uses a sliver of either battery, so the decision is at the bedside. The DELTA 3 Ultra publishes a quiet 30 dBA and switches over in 10ms; the SOLIX lists no noise figure and is too heavy to move to the bedroom easily. Advantage EcoFlow.
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
Either unit
Both power your workstation all day without breaking a sweat. At these utilization levels, prioritize the unit with better USB-C output for direct laptop charging. It's more convenient than using the AC inverter and wastes less energy.
Battery budget usedlower = more headroom
LOAD Laptop 60W×8h · External Monitor 30W×8h · Router + Modem 20W×8h · Phone Charger 15W×2h
SCN-05 · 4 hours · needs 670Wh
Tailgate Party
Game day power for the crew
Either unit
Both handle game day easily. Since capacity isn't the deciding factor, consider weight: the lighter unit is easier to load into a truck bed. Also check if either has Bluetooth speaker-level noise. Fan sound matters in social settings.
Battery budget usedlower = more headroom
LOAD Blender 400W×0.5h · LED TV (55") 80W×4h · Bluetooth Speaker 15W×4h · Phone Charger (×3) 45W×2h
SCN-06 · 24 hours · needs 4,685Wh
Van Life Daily
A full day of mobile living — the ultimate endurance test
Neither unit
A 4,685Wh day is past both base units on a single charge. Both can expand toward it, but the SOLIX's 3,200W solar makes it the stronger off-grid foundation if you're refilling from panels daily. For grid-tied use, that advantage stays theoretical.
Battery budget usedlower = more headroom
LOAD Mini-Fridge 150W×24h · Laptop 60W×4h · Phone Charger 15W×3h · LED Lights 40W×5h · Fan 75W×8h
The Load Test
RUNTIME = (Wh × 0.85) ÷ LOAD
None of the six scenarios above exactly yours? Build it. Toggle what you'd plug in; both units are tested against the combined draw.
Essentials
Comfort & Convenience
High-Draw Appliances
Test duration
8h
Continuous draw
205W
Projected runtime
For this load: SOLIX F3800 PLUS runs 15.9h vs 12.7h.
$2,499.99 list · direct from Anker
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 0–217.6hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–43.5hHigh-Draw Appliances
These reveal the real limitsscale 0–3.3h¹ 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 16, 2026
Verdict: the EcoFlow DELTA 3 Ultra
The DELTA 3 Ultra is the value entry point at $1,199, and it gives up surprisingly little to the $2,899 SOLIX F3800 PLUS for buyers who don't need 240V. It runs $0.10 per lifetime kilowatt-hour against the SOLIX's $0.25, lasts 4,000 charge cycles to 3,000, hands off as a UPS in 10ms to the SOLIX's 20ms, and weighs 77.2 lb against 132.3 — and, crucially, it expands with additional batteries just like the SOLIX does, so 'room to grow' isn't a reason to pay up. What the SOLIX premium actually buys is 6,000W and 240V split-phase output for whole-home backup, plus 3,200W of solar for a large off-grid array. That's a real, specific capability — and if you need it, the SOLIX is the unit. For 120V camping, RV, and home-backup duty, the DELTA 3 Ultra is the smarter buy by $1,700.
Editor-assigned confidence, based on cited owner research and spec analysis.
List prices as of July 16, 2026. The links below open EcoFlow's and Anker's current prices.
$1,299.00 list · direct from EcoFlow
or check the SOLIX F3800 PLUS price$2,499.99 list
Written by Gunner Gustafson, Whole-Home Backup Tester · Station Arena Test Desk · Updated July 16, 2026
Measured Data
Benchmark scores and the full spec record, side by side.
Benchmark scores
Not rated for both units (minimum threshold unmet): UPS, Tailgating.
Full specifications
ᵈ Derived: price ÷ rated capacity. See the data behind our comparisons →
Comparison ToolAdd more power stations, side by sideOpen Tool →How these numbers are produced
Numeric verification
Every figure on this page traces to our spec database or arithmetic on it — no estimated numbers.
Owner claims
Statements about owner experience are cited to published reviews — see Sources & Research Notes below.
Runtime model
Runtime = (rated capacity × 0.85 inverter efficiency) ÷ device wattage. Solar recharge estimates assume panels deliver 70% of rated output. Cold weather, battery age, and stacked loads reduce real-world results.
Power Score
Computed from 14 published spec dimensions, weighted per use-case bench. Higher is better; a unit must meet a bench's minimum threshold to be rated.
See the full weight table and data sourcing on our methodology page →Class ranking (the star rating)
Each unit's star score is a category ranking, not customer reviews — no buyer opinions feed it. We score every station on size-independent quality (value, output, portability, endurance, ports, warranty, and more), then percentile-rank it against the other units in its capacity class, so a class-leading compact unit and a class-leading whole-home unit can both earn 5★. Here, DELTA 3 Ultra rates 5.0/5 (99th percentile of 25 Large-class units), and SOLIX F3800 PLUS rates 4.7/5 (80th percentile of 16 Home Backup-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.
Weight Reality Check
Neither unit is grab-and-go. The DELTA 3 Ultra (77.2 lbs) is manageable solo but heavier than a large checked suitcase. The SOLIX F3800 PLUS (132.3 lbs) is firmly a two-person lift. It goes where you put it and stays there. That's a 55 lb difference, which you'll feel every time you relocate.
The SOLIX has more starting headroom
9,000W of surge to the EcoFlow's 7,200W is a real SOLIX advantage, more cushion for a motor or compressor that spikes two to three times its rated draw at startup. The DELTA 3 Ultra's 7,200W still starts a fridge or a tool cleanly; the SOLIX simply has more margin for stacked heavy loads.
10ms versus 20ms switchover
The DELTA 3 Ultra's 10ms line-interactive handoff is the safer catch for a desktop, NAS, or workstation that hates losing power mid-write; the SOLIX's 20ms standby switchover is still quick but a step behind. For a fridge or a router either is fine — the gap only matters to the most power-sensitive gear.
Warranty Value Comparison
The DELTA 3 Ultra gives you 3.8 years of warranty per $1,000 spent, vs the SOLIX F3800 PLUS's 2 years. That's 1.9× more coverage per dollar. An underrated factor if you're keeping this unit for years.
The EcoFlow lasts more cycles
4,000 charge cycles to the SOLIX's 3,000 is a third more full charge-and-discharge trips before the cells reach their rated wear point — roughly eleven years of daily cycling against eight. The cheaper unit is also the one you replace later.
One unit prints a noise number, the other doesn't
The DELTA 3 Ultra publishes 30 dBA and reviewers confirm it stays quiet under load; Anker lists no rating for the SOLIX F3800 PLUS. Field reports say the SOLIX is quiet until you push past roughly four thousand watts, which is reassuring — but a printed figure beats an implied one when the unit shares your space.
Full record above — the Test Desk pick is the DELTA 3 Ultra.
Check DELTA 3 Ultra price →or check the SOLIX F3800 PLUS 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 3 Ultra wins on both sticker price and long-term value. At $0.11/kWh over its lifetime, it's meaningfully cheaper to own. Clear value winner.
Delivers each lifetime kWh for $0.11 less — check the DELTA 3 Ultra price →
Brand trust
EcoFlow
Ecosystem
EcoFlow fields the deepest lineup in portable power, from RIVER 3 up to DELTA Pro Ultra, with fast X-Stream charging and a well-rated app that adds useful touches like weather-triggered pre-charging.
Support
US-based phone/email/chat support (1-800-368-8604). Experiences are polarized — many report hassle-free prepaid-label replacements, but others report long waits and refurbished units sent for new claims. Pro tip: buying from Costco or Amazon gives you a stronger return safety net.
Community
Largest community in the space — Reddit r/Ecoflow_community (~31K members), multiple Facebook groups, and an official community forum
App experience
Rated 4.6/5 iOS (~8,400 ratings) · 4.2/5 Android (~17,000 ratings)
Unique strength
Fastest-charging technology (X-Stream), deepest product ecosystem, and most active innovation cadence. Supports up to 180kWh modular expansion with DELTA Pro Ultra X.
Worth knowing
Support experiences are polarized between hassle-free replacements and long waits, so buying through Costco or Amazon adds a return safety net.
Anker
Ecosystem
Anker's SOLIX line trades on the parent brand's electronics reputation, with InfiniPower cells rated for long life, a clean app, and a whole-home ecosystem topped by the X1.
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
SOLIX-specific support quality is slipping from Anker's historic standard, and the unit's weight means hazmat return shipping if a claim arises.
Analyst note
Both are actively innovating with five-year warranties and strong apps. EcoFlow has the deeper ecosystem and community; Anker has parent-brand trust but a thinner SOLIX support record. Brand isn't the deciding factor here — the 240V question is.
Growth path
DELTA 3 Ultra
EXPANDABLESupports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 3,072Wh.
Accepts up to 1,600W of solar. Enough for a serious multi-panel array.
Generous port selection supports complex multi-device setups.
Expansion batteries are EcoFlow-specific. You're investing in the EcoFlow ecosystem.
SOLIX F3800 PLUS
EXPANDABLESupports Anker expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 3,840Wh.
Accepts up to 3,200W of solar. Enough for a serious multi-panel array.
Generous port selection supports complex multi-device setups.
Expansion batteries are Anker-specific. You're investing in the Anker ecosystem.
Realistic full solar rechargeat 70% of rated panel output — see methodology
Analyst note
Both expand, but the SOLIX F3800 PLUS's higher solar ceiling (3,200W vs 1,600W) gives it the stronger off-grid growth path — more panels can feed a bigger bank as it grows.
What Owners Report
Patterns from published owner reports and long-term reviews — every claim cited to its source below.
EcoFlow DELTA 3 Ultra
Reviews of the DELTA 3 Ultra overlap heavily with its Ultra Plus sibling — the two share the same 3,072Wh/3,600W core, and several reviewers note the confusion openly — so treat the field read as directional and launch-window rather than long-termA1. Within that caveat, the consistent notes are encouraging: UPS and pass-through behavior is called seamless, with testers reporting no dips or shut-offs when wall power is pulled and no throttling of output down to input wattageA4A6. Fan noise draws repeated praise as quiet even at high output, a step up from older EcoFlow unitsA1A2. Build quality — the shell, the cable, the sliding port-cover doors — is highlighted as premium and well-engineered, though the roughly 74-pound body is flagged as a real portability drawback softened by the wheels and handleA9A14A15.
“Even when you're pushing it hard, the DELTA 3 Ultra Plus runs much quieter than older EcoFlow models, like the DELTA 2 Max.”
Sources
thesolarlab.com · postperspective.com · appleinsider.com · digitaltrends.com · popsci.com
Anker SOLIX F3800 PLUS
Owner and reviewer reports on the SOLIX F3800 PLUS put its acoustic and UPS behavior first: under normal household loads the fans are described as barely audible, getting loud only when you push past roughly four thousand watts or charge at maximum speedB10B12. In whole-home UPS mode, one review measured about a 20ms switchover and noted that despite all the extra cabling of a home-panel install, the lights still barely flickered when the grid droppedB3. A useful firmware footnote: the earliest reviews centered on the unit's standby drain, and Anker later shipped an update said to cut idle consumption by roughly half, though that fix couldn't be cross-verified against a second independent ownerB9. Coverage specific to the Plus is otherwise thin, skewed toward review sites rather than long-term owners.
“I've called them and submitted tickets via their portal, always very responsive. They've even done advanced replacement for me.”
Sources
campingsolar.us · cleanenergybusinesscouncil.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
- Reviewers consistently praise the quiet fan operation of the Ultra-tier unit compared to older EcoFlow models, though this is described in professional test conditions rather than long-term ownership. [DELTA 3 Ultra · 2 entries]
- UPS/switchover performance is repeatedly called seamless with no observed dips or shutdowns during power interruption tests. [DELTA 3 Ultra · 3 entries]
- The unit's substantial 74 lb weight is flagged across multiple reviews as a portability drawback, mitigated somewhat by wheels and handle design. [DELTA 3 Ultra · 2 entries]
- Build quality/durability (casing, cable, port covers) is repeatedly highlighted as premium and well-engineered. [DELTA 3 Ultra · 2 entries]
- Owner support experiences with Anker/Solix diverge sharply — some report being ghosted after repeated contact attempts over a hardware fault, while others describe fast, responsive advanced-replacement service. [SOLIX F3800 PLUS · 2 entries]
- Real-world runtime drops off steeply with load: light loads (lights, router, occasional laptop/e-bike charging) stretch toward the ~17-hour mark, but running a fridge and freezer together drains the base unit in around 7 hours. [SOLIX F3800 PLUS · 2 entries]
- Fan noise is reported as low/background during normal household loads and only becomes noticeably audible under heavy loads (4,000W+) or max-speed charging. [SOLIX F3800 PLUS · 2 entries]
- The unit's near-137 lb weight is a recurring friction point: reviewers note the wheels/handles work for moderate use but struggle over rough terrain, and aggregated user feedback flags portability and packaging as concerns despite praise for raw performance. [SOLIX F3800 PLUS · 2 entries]
- A1
“Even when you're pushing it hard, the DELTA 3 Ultra Plus runs much quieter than older EcoFlow models, like the DELTA 2 Max.”
thesolarlab.com — EcoFlow DELTA 3 Ultra Plus Review: The Ultimate DELTA? · 2025-09/10 (approx) · [positive]
- A2
“Even when you're pushing the inverter to its maximum output, the fans never become annoying or distracting.”
thesolarlab.com — EcoFlow DELTA 3 Ultra Plus Review: The Ultimate DELTA? · 2025-09/10 (approx) · [positive]
- A4
“Many power stations limit you to the input wattage when outputting power, but this EcoFlow power station does not.”
thesolarlab.com — EcoFlow DELTA 3 Ultra Plus Review: The Ultimate DELTA? · 2025-09/10 (approx) · [positive]
- A6
“I didn't experience any shut-offs or dips when I unplugged the EcoFlow from the wall.”
postperspective.com — Review: EcoFlow Delta 3 Ultra Plus Portable Power Station · 2026-04 · [positive]
- A9
“It does not feel cheap or fragile. Everything from the outer shell case to the plastic buttons and the AC cable feels substantial and durable enough to withstand day-to-day wear and tear.”
appleinsider.com — EcoFlow Delta 3 Ultra Plus review: Premium, but solid power · 2025-11-16 · [positive]
- A14
“The sturdy telescoping handle and wheels make it effortless to cart around, and if you do have to lift its admittedly somewhat hefty 74 lbs, grab handles are well placed for the task.”
popsci.com — EcoFlow DELTA 3 portable power station series first impressions · 2025-09-29 · [positive]
- A15
“I really love how the rear panel doors for the input ports slide into protective slots when in use.”
popsci.com — EcoFlow DELTA 3 portable power station series first impressions · 2025-09-29 · [positive]
- B3
“In UPS mode, the F3800 Plus can switch in about 20ms. There's more cabling and components when connected to the whole home setup, but the lights still barely flicker.”
Android Authority — "Anker SOLIX F3800 Plus with Home Power Panel review: Total power backup" · 2025-05 · [positive]
- B9
“Early reviews focused heavily on the standby drain of the Anker SOLIX F3800 Plus. Anker later released a firmware update that said it can cut idle use by about 50%.”
VoltNest — "Anker SOLIX F3800 Plus Review: My Honest Test Results" · 2026-04 · [mixed]
- B10
“Under normal loads (lights, fridge, TV), the fans are barely audible. It only gets loud when you're pulling over 4,000W or charging at max speed.”
CampingSolar.us — "Anker SOLIX F3800 Plus Review: The Ultimate 240V Home & RV Power" · 2026-02 · [positive]
- B12
“It doesn't match the whisper-quiet performance of the EcoFlow Delta Pro Ultra, which remains one of the quietest power stations we've ever tested, but the F3800 Plus is still surprisingly quiet, even when you're really pushing it.”
TheSolarLab — "Anker SOLIX F3800 Plus Review: Big Power, Big Price?" · unknown · [positive]
Research compiled July 16, 2026.
Who Should Buy Which
Buy the DELTA 3 Ultra if you…
- →The value buyer: $1,199 is the cheapest entry to a 3kWh-class unit here, at $0.10 per lifetime kilowatt-hour.
- →The 120V household: 3,600W runs a fridge, electronics, and a circuit of gear, and it expands later just like the SOLIX.
- →The home-office or CPAP user: a 10ms UPS switchover and a published 30 dBA are the specs that matter beside the unit.
- →Anyone who moves the unit: 77.2 lb is a one-person job where the SOLIX's 132.3 needs two.
Buy the SOLIX F3800 PLUS if you…
- →The whole-home backup buyer: 6,000W and 240V split-phase carry a well pump, dryer, or range the EcoFlow can't drive.
- →The off-grid builder: 3,200W of solar input refills a large array far faster than the EcoFlow's 1,600W.
- →The heavy-simultaneous-load user: 9,000W of surge and 6,000W continuous run several big things at once.
If neither fits
If your day looks like our Van Life basket at 4,685Wh, neither base unit finishes it on one charge. Both expand, so either could be built up to reach it — but at that point you're designing a system with multiple batteries and serious solar, not choosing between two starter units. Size the platform to the load rather than stretching a base unit past its limit.
The Bottom Line
The DELTA 3 Ultra wins because the SOLIX's biggest selling point cancels out. Both units expand, so you're not paying the $1,700 premium for room to grow — you're paying it for 6,000W and 240V split-phase output. That's a genuine capability, and if you need whole-home or 240V backup, the SOLIX F3800 PLUS is the right unit and worth the money.
If you don't, the math is lopsided in the EcoFlow's favor: $1,199 up front, $0.10 per lifetime kilowatt-hour, 4,000 charge cycles, a 10ms UPS handoff, a published 30 dBA, and 55 fewer pounds to move — plus the same ability to add batteries later. For the 120V buyer, the DELTA 3 Ultra is the cheaper, longer-lived, easier-to-live-with unit, and the SOLIX's extra output is a bill for power you'll never draw.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Both units expand, so what does the SOLIX's $1,700 premium actually buy?
Output, not growth. Since the DELTA 3 Ultra expands with add-on batteries just like the SOLIX, expandability can't justify the price gap. The premium buys the SOLIX's 6,000W continuous output and 240V split-phase power for whole-home backup, plus 3,200W of solar for a large off-grid array. If you don't need 240V or a big solar array, you're paying for capability you won't use.
Is the DELTA 3 Ultra enough for home backup?
For 120V backup, yes. At 3,600W it runs a fridge, furnace blower, electronics, and a full circuit of household gear, and its 3,072Wh covers a typical blackout with margin. What it can't do is drive 240V loads like a well pump or electric dryer — that's the SOLIX F3800 PLUS's job. Match the unit to whether your backup plan includes anything 240V.
Which one is cheaper to own over time?
The DELTA 3 Ultra, by a wide margin. It costs $0.10 per lifetime kilowatt-hour to the SOLIX's $0.25, carries a $240 warranty-year cost to $580, and lasts 4,000 charge cycles to 3,000. Even with a smaller battery it delivers more total lifetime energy — 12,288 kilowatt-hours to 11,520 — at less than half the cost per unit.
Is the DELTA 3 Ultra the same as the Ultra Plus?
They share the same 3,072Wh capacity and 3,600W output core, which is why reviews of the two overlap and occasionally get confused. The Plus variant is positioned as the higher-tier model in the line. For this comparison, the specs that matter — capacity, output, cycles, UPS speed, weight — are the ones listed here for the DELTA 3 Ultra.
How much easier is the DELTA 3 Ultra to move?
Substantially. It weighs 77.2 lb to the SOLIX's 132.3 — a 55-pound difference that makes it a one-person lift where the SOLIX needs two. Both have wheels, but the SOLIX's are noted to struggle over rough ground. If the unit travels or changes rooms often, the EcoFlow is far less of a chore.
Where to buy
EcoFlow DELTA 3 UltraPick
$1,299.00
$1,299.00 list · direct from EcoFlow
Anker SOLIX F3800 PLUS
$2,499.99
$2,499.99 list · direct from Anker
Prices may vary by retailer and are subject to change.