Head-to-head test
EcoFlow DELTA 3 Ultra vs Anker SOLIX F3800
The F3800 buys you 6,000W and 768 more watt-hours for $1,500 more and 55 extra pounds — muscle most buyers of a portable unit never wire in; unless you're backing up whole-home circuits, the DELTA 3 Ultra does the same daily jobs at half the price, more cycles, and half the back strain.
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
6,237Power Score · The AC & Fridge Zone
$1,999.99 list · direct from Anker
Spec deltas
The Anker SOLIX F3800 costs $2,699 and weighs 132.3 pounds. The EcoFlow DELTA 3 Ultra costs $1,199 and weighs 77.2. That's the whole tension in two lines: the F3800 is the more powerful box, and the DELTA is the one you can afford and still move.
On raw output the F3800 wins going away — 6,000W continuous and a 9,000W surge against the DELTA's 3,600W and 7,200W. That's real muscle, enough to start large 240V household loads the DELTA simply can't. The catch is that a fridge, a microwave, a CPAP, and a full rack of tools all start comfortably on 3,600W, so for most of what people actually plug in, the extra 2,400W sits idle.
Where the DELTA pulls ahead is the math you live with after the purchase. It's rated for 4,000 charge cycles against the F3800's 3,000, and it works out to $0.10 per lifetime kilowatt-hour against $0.23. The F3800 costs more today, stores a bit more, and wears out sooner. Only the whole-home backup buyer should pay that premium on purpose.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
rated cycles
That combination is why the pricier unit is also the pricier one to own: $0.23 per lifetime kWh against the DELTA's $0.10, and $540 per warranty year against $240. You pay more up front for a box that delivers less energy over its life.
F3800: $2,699, 3,840Wh, rated 3,000 cyclesDELTA 3 Ultra: $1,199, 3,072Wh, rated 4,000 cycles
Why it mattersA buyer picking on total cost of ownership, not sticker capacity, takes the DELTA without a second look.
continuous output
That headroom only cashes out on loads above 3,600W — a central-air compressor, an electric range element, a deep-well pump. For a fridge, a space heater, power tools, or anything you'd run camping, both units start the load with room to spare, so the gap changes nothing.
F3800: 6,000W continuous, 9,000W surgeDELTA 3 Ultra: 3,600W continuous, 7,200W surge
Why it mattersIf nothing you own draws more than 3,600W, the F3800's signature spec is a number you paid for and won't use.
weight
At 132 pounds the F3800 is a two-person lift you install once and never relocate — it's a fixture, not gear. The DELTA at 77 pounds is still a one-person-with-wheels unit that goes in a truck bed if it has to.
F3800 weighs 132.3 lbDELTA 3 Ultra weighs 77.2 lb and ships with a telescoping handle and wheelsA14
Why it mattersAnyone who wants the unit to ever leave the utility room should cross the F3800 off now.
solar input
But owners consistently report the F3800's input is so picky about panels that they charge from the wall insteadB1B2B13 — and one notes the line cord runs hot at the full 1,800W wall rate, so they throttle it back to 600-800WB3. A solar ceiling you can't practically reach isn't a growth path, it's a spec-sheet number.
F3800 accepts up to 2,400W of solar; DELTA 3 Ultra accepts up to 1,600WF3800 owners report the DC input is restrictive enough that they barely use solarB1B2B13
Why it mattersAn off-grid buyer eyeing the F3800's 2,400W should price a compatible panel array before assuming that ceiling is real.
The specific dimensions that decide these two units — everything else is a tie.
Lifetime Value
Selected because: Cheaper to buy and cheaper to own — the DELTA's core case rests here.
cost / lifetime kWh
The DELTA 3 Ultra costs less than half the F3800 up front, $1,199 against $2,699, and the gap widens over time rather than closing. It's rated for 4,000 cycles against the F3800's 3,000, which is why it lands at $0.10 per lifetime kWh against $0.23, and $240 per warranty year against $540.
The F3800 answers with 768Wh more capacity, 3,840Wh against 3,072. That's a genuine edge if you need every watt-hour, but it's a 25% capacity bump attached to a 125% price bump. Per dollar and per year, this isn't close.
PowerScore Breakdown
Selected because: The F3800's one genuine structural edge is output; name it honestly.
overall power score
This is where the F3800 earns its keep. It posts a 6,013 power score against the DELTA's 5,450 on the strength of 6,000W continuous output against 3,600W, plus a 9,000W surge against 7,200W. If your reason for buying is to back up a whole house — the kind of split-phase, high-draw loads that trip a 3,600W inverter — the F3800 is the only one of these two that does the job.
Just be honest with yourself about the load list. Fridge, freezer, furnace blower, CPAP, laptops, lights, a microwave in bursts — all of that starts and runs on the DELTA's 3,600W. The F3800's extra 2,400W is insurance against loads most buyers of a portable station don't own.
Portability & Form Factor
Selected because: 132 lb vs 77 lb is the difference between a fixture and a unit you can move.
weight
At 132.3 pounds the F3800 is furniture. It takes two people to place, and once it's placed it stays — this is a unit you wire into a transfer switch and forget, not one you carry to a campsite. Reviewers note it's near-silent in use, right up until you try to lift itB11.
The DELTA's 77.2 pounds is no featherweight either, but it ships with a telescoping handle and wheels, and reviewers call it genuinely easy to cart around with well-placed grab handles for the times you do lift itA14. One of these travels. The other is installed.
Growth Path
Selected because: Both expand; the F3800's higher solar ceiling is undercut by real input limits.
solar input
Both units take expansion batteries, so neither is a dead end, and the F3800 scales to a larger total than the DELTA. On top of that it lists a higher solar ceiling, 2,400W against 1,600W, which reads like the stronger off-grid platform.
The reads-like is the problem. F3800 owners consistently report the DC input is fussy enough that generic panels won't cooperate, pushing them toward pricey Anker-branded arrays or back to the wall entirelyB1B2B13. A 2,400W ceiling you can only hit with the manufacturer's own panels is a narrower path than the number suggests. The DELTA's 1,600W is lower but far less particular about how you feed it.
Strengths & trade-offs
EcoFlow DELTA 3 Ultra
Strengths
- +Costs $701 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
Strengths
- +Larger battery capacity
- +Higher AC output
- +Faster solar charging
Trade-offs
- –Substantially more expensive (+$701) 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
The DELTA 3 Ultra cuts it close at 80%. One cold night or an unexpected device and you're rationing power. The SOLIX F3800 finishes at 64%, leaving real headroom for spontaneous use. If you camp in variable weather, that buffer keeps you relaxed instead of checking your battery app every 20 minutes.
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
Both survive, but the SOLIX F3800 finishes at just 50% used. That's enough reserve for a second blackout night. The DELTA 3 Ultra at 63% leaves little margin if the outage runs longer than expected. In storm-prone areas, that remaining capacity is insurance.
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
Both are wildly overqualified for CPAP. You're using 12% or less. Save your money and buy whichever is cheaper; the extra capacity is completely wasted on a 40W overnight load. Put the savings toward a second battery for multi-night trips.
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
Neither unit can fully handle this scenario (needs 4,685Wh). You'd need a higher-capacity station or to cut back on usage.
Battery budget usedlower = more headroom
LOAD Mini-Fridge 150W×24h · Laptop 60W×4h · Phone Charger 15W×3h · LED Lights 40W×5h · Fan 75W×8h
The Load Test
RUNTIME = (Wh × 0.85) ÷ LOAD
None of the six scenarios above exactly yours? Build it. Toggle what you'd plug in; both units are tested against the combined draw.
Essentials
Comfort & Convenience
High-Draw Appliances
Test duration
8h
Continuous draw
205W
Projected runtime
For this load: SOLIX F3800 runs 15.9h vs 12.7h.
$1,999.99 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
For most people choosing between these two, the DELTA 3 Ultra is the buy: $1,199 against $2,699, 4,000 cycles against 3,000, and $0.10 per lifetime kWh against $0.23 — cheaper up front and cheaper to keep. The F3800 is the bigger, stronger machine on paper, with 6,000W continuous against 3,600W and 768Wh more capacity, and it does win the capacity-bound scenarios like Weekend Camping and the 8-Hour Blackout. But it wins them with headroom both units already have, and it costs that win in dollars, pounds, and cycle life. The F3800 earns its premium in exactly one place: you're wiring split-phase, whole-home backup and genuinely need 6,000W to start a central-air compressor or well pump the DELTA's 3,600W can't. If that's not you, the extra $1,500 buys capability you'll never draw.
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 price$1,999.99 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 rates 4.5/5 (73rd 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 (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.
Surge Power: Inverter Quality Indicator
The DELTA 3 Ultra has a 2× surge-to-continuous ratio vs the SOLIX F3800's 1.5×. A higher ratio (≥2×) means the inverter handles motor startup surges better. That's critical for fridges, AC compressors, and power tools that briefly draw 2-3× their rated wattage. The SOLIX F3800 may trip when starting these appliances even though its continuous wattage looks sufficient.
UPS Speed: line-interactive (<10ms) vs standby (<20ms)
The DELTA 3 Ultra switches to battery in 10ms (line-interactive (<10ms)), while the SOLIX F3800 takes 20ms (standby (<20ms)). Safe for desktop PCs, routers, and CPAP machines. NAS drives are protected. This matters if you're using it as a home UPS for always-on equipment.
Warranty Value Comparison
The DELTA 3 Ultra gives you 3.8 years of warranty per $1,000 spent, vs the SOLIX F3800's 2.5 years. That's 1.5× more coverage per dollar. An underrated factor if you're keeping this unit for years.
Battery Lifespan in Real Years
The DELTA 3 Ultra is rated for 4,000 cycles vs 3,000. In real life: at daily use, that's 11 vs 8.2 years. At weekend use (twice a week), it's 38 vs 29 years. After hitting the cycle limit, the battery doesn't die. It drops to ~80% original capacity, which is still very usable.
SOLIX F3800: Noise Level Not Disclosed
The DELTA 3 Ultra publishes its noise level (30dB), but the SOLIX F3800 doesn't. Brands that don't disclose noise specs often have louder units. If noise matters to you (CPAP users, apartment dwellers), this is worth investigating before buying.
Full record above — the Test Desk pick is the DELTA 3 Ultra.
Check DELTA 3 Ultra price →or check the SOLIX F3800 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.
Brand trust
EcoFlow
Ecosystem
Largest in portable power — 12-15 models across DELTA Pro, DELTA 3, and RIVER 3 series, plus solar panels and smart home panels
Support
US-based phone/email/chat support (1-800-368-8604). Experiences are polarized — many report hassle-free prepaid-label replacements, but others report long waits and refurbished units sent for new claims. Pro tip: buying from Costco or Amazon gives you a stronger return safety net.
Community
Largest community in the space — Reddit r/Ecoflow_community (~31K members), multiple Facebook groups, and an official community forum
App experience
Rated 4.6/5 iOS (~8,400 ratings) · 4.2/5 Android (~17,000 ratings)
Unique strength
Fastest-charging technology (X-Stream), deepest product ecosystem, and most active innovation cadence. Supports up to 180kWh modular expansion with DELTA Pro Ultra X.
Worth knowing
The Oct 2025 DELTA Max 2000 recall (overheating/fire risk, 6 incidents) is worth noting. Also tested subscription paywalls for advanced app features in early 2025 before community backlash paused the plan. No parts or service offered out of warranty.
Anker
Ecosystem
7-8 SOLIX portable power stations across C-series (compact) and F-series (flagship), plus the X1 home energy system
Support
US-based support. Historically known for incredible no-hassle replacements, but recent reports describe AI-driven support agents giving generic responses and complex return logistics for heavy units (hazmat shipping). The Anker brand reputation is still strong, but SOLIX-specific support quality is trending down.
Community
Moderate — active Reddit (r/Anker, r/AnkerSOLIXCommunity) and growing. Benefits from Anker's massive consumer electronics brand awareness.
App experience
Rated 4.5/5 iOS (~1,100 ratings) · 4.3/5 Android
Unique strength
Parent brand trust from Anker's consumer electronics dominance. InfiniPower technology for long cycle life. Strong $/Wh value in the mid-size and larger units — the S2000, F2600 and C1000 are among the better buys per watt-hour in the catalog.
Worth knowing
Support quality appears to be declining from its historically excellent level. Firmware updates have removed features without warning. Expansion ecosystem is smaller than EcoFlow's.
Analyst note
EcoFlow 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 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
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 2,400W 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's higher solar ceiling (2,400W 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
Field data on the DELTA 3 Ultra is still thin — it's a recent release, and most of what exists comes from professional reviews of the closely-related Ultra Plus rather than long-term owners, so treat this as launch-window impressions, not six-month reports. With that caveat, the standout theme is the UPS behavior: reviewers unplugged it mid-load and saw no dips or shutdowns, one comparing the switchover directly to an always-on APC unitA5A6. Unlike many stations, it doesn't throttle its output to the input wattage during passthroughA4.
Reviewers also praise the build — casing, cable, and port covers all described as substantial rather than cheapA9A15 — and note the fans stay unobtrusive even at full outputA1A2. The recurring gripe is minor: the screen washes out in direct sunA11.
“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
The loudest, most consistent F3800 owner complaint is the solar input. Owners repeatedly report it's restrictive to the point of being unusable with generic panels, effectively locking them into pricier Anker arrays or the wall outletB1B2B13B14. One notes that charging at the full 1,800W wall rate makes the line cord run hot, so they throttle back to 600-800WB3, and there's no passthrough — you can't charge from AC while dischargingB4.
Support experiences are polarized: some owners describe fast, responsive replacements and even advance RMAsB9, while at least one reports being ignored after a five-figure purchaseB8. On the hardware itself, when it's fed and running, owners are happy — one has it wired through a transfer switch running everything including a water pumpB5.
“I have been using the F3800 for a couple weeks now, using only a single 120V outlet into a reliance transfer switch and it runs everything I throw at it including a water pump.”
Sources
diysolarforum.com · thesolarlab.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]
- Owners consistently complain that the solar/DC input is restrictive, effectively locking users into pricier Anker-branded panels rather than generic arrays. [SOLIX F3800 · 4 entries]
- Fan/inverter noise is generally reported as quiet at idle but with occasional intermittent buzzing/rattling under load or fault conditions. [SOLIX F3800 · 3 entries]
- Anker support experiences are polarized — some owners report fast, responsive replacements while at least one reports being ignored after a major purchase. [SOLIX F3800 · 3 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]
- A5
“Over my career I have become accustomed to APC batteries immediately switching on when there is a power hit or power shut-off, and the EcoFlow Delta 3 Ultra Plus works in the exact same way.”
postperspective.com — Review: EcoFlow Delta 3 Ultra Plus Portable Power Station · 2026-04 · [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]
- A11
“But, while facing the sun, I had to employ the classic "cup hands cover" maneuver to get a clear look at the screen status.”
appleinsider.com — EcoFlow Delta 3 Ultra Plus review: Premium, but solid power · 2025-11-16 · [negative]
- 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]
- B1
“The solar input for charging is a pain, so much so that I'm only using it if there is no other way to charge the F3800.”
diysolarforum.com — 'Anker F3800 user reviews and opinions welcome' · 2024-07 · [negative]
- B2
“The limitations of the inputs make it very difficult to use solar panels other than Anker's panels, which are pricey for a "full up" config.”
diysolarforum.com — 'Anker F3800 user reviews and opinions welcome' · 2024-07 · [negative]
- B3
“if you charge the F3800 from a 120VAC wall outlet at full rate (1800 watts), the line cord gets very hot. I've backed off the charge rate to 600-800 watts.”
diysolarforum.com — 'Anker F3800 user reviews and opinions welcome' · 2024-07 · [negative]
- B4
“the lack of passthru mode, you cannot charge via the 120VAC input while discharging.”
diysolarforum.com — 'Anker F3800 user reviews and opinions welcome' · 2024-07 · [negative]
- B5
“I have been using the F3800 for a couple weeks now, using only a single 120V outlet into a reliance transfer switch and it runs everything I throw at it including a water pump.”
diysolarforum.com — 'Anker F3800 user reviews and opinions welcome' · 2024-07 · [positive]
- B8
“Anker support is ghosting me after I spent over 20k on their solix line and solar panels within a month... they are not answering/returning my calls or emails.”
diysolarforum.com — 'Big issue with Anker Solix F3800 plus battery pack' · 2025-08 · [negative]
- B9
“I've called them and submitted tickets via their portal, always very responsive. They've even done advanced replacement for me.”
diysolarforum.com — 'Big issue with Anker Solix F3800 plus battery pack' · 2025-08 · [positive]
- B11
“producing between 50 and 60 decibels when engaged, making it almost inaudible during regular use... until you try to lift it, that is.”
thesolarlab.com — 'Anker SOLIX F3800 Review: Did It Kill the Competition?' · unknown · [positive]
- B13
“no one on Youtube is addressing the solar input problem directly. But People smarter than myself with secondary charge controllers... are able to navigate around the problem.”
diysolarforum.com — 'Anker F3800 user reviews and opinions welcome' · 2024-07 · [negative]
- B14
“other than the solar input problem having limited panel array choices to max out it's input capability it's a great unit so far.”
diysolarforum.com — 'Anker F3800 user reviews and opinions welcome' · 2024-07 · [mixed]
Research compiled July 16, 2026.
Who Should Buy Which
Buy the DELTA 3 Ultra if you…
- →You want 3kWh of backup that's cheaper to buy, cheaper to own over 4,000 cycles, and light enough to still move on its wheels.
- →Your heaviest load is a fridge, furnace blower, or power tools — anything that starts comfortably under 3,600W.
Buy the SOLIX F3800 if you…
- →You're wiring split-phase whole-home backup and genuinely need 6,000W to start a central-air compressor, electric range, or deep-well pump.
- →You want the largest single-unit capacity here and will keep it permanently installed, where its 132 pounds never has to move.
If neither fits
Full daily van life needs about 4,685Wh — 179% of the DELTA's capacity and 144% of the F3800's — so neither covers it alone. If you need multi-day off-grid living or true days-long whole-home autonomy, you're shopping for a modular stack (dual F3800s or an EcoFlow DELTA Pro Ultra), not a single station.
The Bottom Line
The F3800 is the more powerful machine, and for the narrow slice of buyers wiring 6,000W whole-home backup, it's the right one. Everyone else is looking at $1,500 and 55 pounds of capability that stays parked: the DELTA 3 Ultra costs half as much, is rated for 1,000 more cycles, comes in at $0.10 per lifetime kWh against $0.23, and still fits in a truck.
Buy the F3800 if your load list actually crosses 3,600W. If it doesn't — and for most people it never will — the DELTA 3 Ultra is the smarter money by a wide margin.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Is the Anker F3800 worth twice the price of the EcoFlow DELTA 3 Ultra?
Only if you specifically need its 6,000W output for whole-home, split-phase loads the DELTA's 3,600W can't start. For everyday backup and portable use, the DELTA does the same jobs at $1,199 against $2,699, with more cycles and a lower cost per kWh. The F3800's extra 768Wh of capacity doesn't justify the $1,500 gap on its own.
Which one is cheaper to own over time?
The DELTA 3 Ultra, clearly. It's rated for 4,000 cycles against the F3800's 3,000, which works out to $0.10 per lifetime kilowatt-hour against $0.23, and $240 per warranty year against $540. It's the cheaper box both to buy and to keep.
Can the EcoFlow DELTA 3 Ultra run my whole house?
Partial backup, yes — it handles standard 120V circuits like the fridge, furnace blower, lights, and outlets on its 3,600W inverter. What it can't do is start large 240V loads like central AC or a deep-well pump. If whole-home, split-phase backup is the goal, that's the specific case where the F3800's 6,000W is worth the premium.
How hard is the F3800 to move?
Hard. At 132.3 pounds it's a two-person lift and effectively a permanent fixture — you install it and leave it. The DELTA 3 Ultra weighs 77.2 pounds and ships with wheels and a telescoping handle, so it's the far better choice if the unit ever needs to travel.
Where to buy
EcoFlow DELTA 3 UltraPick
$1,299.00
$1,299.00 list · direct from EcoFlow
Anker SOLIX F3800
$1,999.99
$1,999.99 list · direct from Anker
Prices may vary by retailer and are subject to change.