Head-to-head test
EcoFlow DELTA 3 Ultra vs Anker SOLIX F3800
The Ultra is a box you carry; the F3800 is a box you set down beside the breaker panel and never move again, and every other difference on this page is that one fact wearing different units.
Full profiles: EcoFlow DELTA 3 Ultra → · Anker SOLIX F3800 →
Written by Gunner GustafsonUpdated
Whole-Home Backup Tester, Station Arena Test Desk
$1,399.00 · direct from EcoFlow
Last checked 1 day ago. Prices move — check before you buy.
$2,199.99 · direct from Anker
Last checked 1 day ago. Prices move — check before you buy.
Spec deltas
$1,399 buys the DELTA 3 Ultra. $2,000 buys the SOLIX F3800. The $601 between them doesn't buy a better power station, it buys a different kind of machine: nearly twice the weight, wired to a panel, and going nowhere once you set it down.
On paper the Anker wins going away. 3,840Wh against 3,072Wh, 6,000W continuous against 3,600W, 9,000W of surge against 7,200W, three times the solar input, and an expansion port the Ultra doesn't have. Our PowerScore agrees, 6,237 to 5,072. Then you run the pair through the six scenarios we model and that extra capacity never once changes what either unit can actually carry. Weekend camping at 2,100Wh, an eight-hour blackout at 1,645Wh, a CPAP night at 320Wh, a remote workday at 910Wh, a tailgate at 670Wh: each unit covers all of them. Van-life daily draw at 4,685Wh: neither does.
So capability isn't the decision. The decision is whether you need capability that only exists once the unit stops moving. Wiring a transfer switch, starting a well pump, planning to add batteries next year, that's the F3800's job and no amount of money turns the Ultra into it. Everyone else keeps the $601 and gets the battery that lasts longer into the bargain.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
rated cycles
Price it out and the Ultra runs $0.11 per lifetime kilowatt-hour against the Anker's $0.17. What the premium buys is a bigger single-charge tank and the inverter bolted to it, not durability and not more energy over the years you own it.
DELTA 3 Ultra: 3,072Wh rated, 4,000 cycles, $1,399SOLIX F3800: 3,840Wh rated, 3,000 cycles, $2,000The F3800 holds 768Wh more per charge (3,840 − 3,072)
Why it mattersAnyone cycling a unit hard every day, in a van or a cabin or off a jobsite trailer, should treat the Ultra as the better asset, and the gap widens every year it stays in service.
solar input
The Anker's best number is the one you have to buy twice. Reaching the rated input means Anker's own panels at Anker's pricesB2, stacked on top of the hardware premium, and the wall-charging path carries its own asterisk: one owner permanently dialed the rate back after the line cord ran hotB3.
F3800 accepts 2,400W of solar input; DELTA 3 Ultra accepts 800WAt full rated input the F3800 refills in about 1.5 hours (3,840Wh ÷ 2,400W); the Ultra needs about 4 hours (3,072Wh ÷ 800W)Owners consistently report the F3800's DC input is restrictive enough that third-party arrays are impractical, pushing them toward Anker's own panelsB1B2B13B14
Why it mattersIf solar is your main recharge path and you already own third-party panels, price the replacement array before you count the Anker's input as a win.
weight
Which makes the next owner report sting. The F3800 won't charge from its AC input while it's dischargingB4. On a camping trip that's a shrug. On a unit wired into your panel, doing the exact job its weight committed it to, it's a limit you plan your outage around. Switchover points the same direction, 10ms on the Ultra against 20ms on the Anker, and testers who yanked the Ultra's wall plug mid-load saw no dip and no shutdownA5A6.
DELTA 3 Ultra: 72.1 lb. SOLIX F3800: 132.3 lb, a 60.2 lb differenceF3800: 6,000W continuous, 9,000W surge, support for add-on batteriesOne owner runs the F3800 into a Reliance transfer switch and reports it handling everything asked of it, water pump includedB5
Why it mattersPlanning a transfer switch and a permanent corner of the garage? The Anker is the right class of machine and you budget around how it charges. Planning to move it? The conversation ended when you tried to pick it up.
Capacity
The Anker's capacity only turns decisive with add-on batteries, which is a second purchase sitting on top of the first. Bought as it ships, the extra headroom is margin you were never going to spend.
Weekend Camping needs 2,100Wh: Ultra uses 80% of usable capacity, F3800 64%8-Hour Blackout needs 1,645Wh: Ultra 63%, F3800 50%Van Life Daily needs 4,685Wh: Ultra 179%, F3800 144%, and neither unit covers itThe DELTA 3 Ultra is fixed at 3,072Wh; the F3800 accepts add-on batteries past its 3,840Wh base
Why it mattersBuy the F3800 if you have a concrete plan and a budget to grow it past 3,840Wh. If you don't, $601 is buying you margin that changes no answer on this page.
The specific dimensions that decide these two units — everything else is a tie.
Portability & Form Factor
Selected because: 60.2 lb separates them, and it settles this matchup before any other spec gets a vote.
weight
The Ultra goes in the trunk. The Anker goes wherever two people put it down, and that is where it stays. 72.1 lb is a genuine lift, the bent-knees kind with a clear path to the tailgate, but one annoyed adult gets it done. Another 60.2 lb on top of that is a different activity with a different number of people in it.
Weight also tells you what each machine was built to be. The Anker's output rating and pack size describe something that lives beside an electrical panel and gets switched in when the grid drops. The Ultra covers the same appliance list short of the heaviest continuous draws, in a package that still fits the trunk-and-campsite pattern most buyers at this size actually have. Buy the one that matches where the box will spend its life, because that choice makes every other spec on this page follow.
Lifetime Value
Selected because: $1,399 against $2,000, and the cheaper unit is the one still working when the expensive one is finished.
cost / lifetime kWh
The cheaper battery is the one that keeps going, which is not how this usually works. 4,000 cycles against 3,000 is where it starts, and the Ultra's smaller pack more than makes the difference up in the multiplication. Same 5-year warranty on each, and the Ultra costs $260 of it per year against the Anker's $400.
Run it down and back every day and the Ultra's rated life works out to about 11 years against 8.2. Weekends only, it's 38.5 years against 28.8, or $0.09 a day against $0.19. Nobody should plan around numbers that far out, but the ratio is the point. Per watt-hour sitting on the shelf, $0.42 against $0.52. Per watt-hour you actually pull out of it over a decade, the gap is wider than that, and nothing on the Anker's spec sheet closes it.
Growth Path
Selected because: Growing past 3,840Wh is the one thing the DELTA 3 Ultra can't do at any price.
solar input
Outgrow the Ultra and your upgrade path is a second power station. It's sealed at 3,072Wh, no port, no add-on packs, and that's the honest catch on the unit we're recommending. The F3800 starts at 3,840Wh and takes Anker add-on batteries, so a load list creeping toward partial-home backup has somewhere to go without replacing the base unit.
It only counts if you act on it, though. Van-life daily draw defeats the base F3800 too, so for that buyer the growth path is the entire reason to choose this unit rather than a bonus sitting on top of it. For anyone who won't actually buy the second battery, $601 is a lot to pay for capacity the Ultra already covers in every scenario on this page.
What the Specs Don't Tell You
Selected because: The Anker's best number and the Ultra's one real ceiling live here rather than in the headline specs.
rated cycles
The Anker's best number is the one owners have the hardest time reaching. Its DC input outclasses the Ultra's three to one on paper, and owners consistently report that panel compatibility is tight enough to make generic arrays impractical, which funnels you toward Anker's ownB1B2B13B14. One charges by solar only when there's no alternativeB1. Another calls it a great unit apart from precisely thatB14. A spec you can't feed with the panels already in your garage isn't an advantage yet.
Two smaller catches lean the same way. Anker publishes no dBA figure for the F3800 at all, which is a strange thing to leave off a machine people put in bedrooms. And on surge, the Anker's bigger peak sits on a bigger continuous rating, 1.5× of headroom against the Ultra's full 2×, so the Ultra has proportionally more room to swallow a motor start while it's already working near its limit. Against all that, the Ultra's fixed 3,072Wh is a real ceiling and we're not going to pretend otherwise.
Strengths & trade-offs
EcoFlow DELTA 3 Ultra
Strengths
- +Costs $601 less
- +Lighter by 60.2 lb
- +Rated for 4,000 charge cycles — much longer battery lifespan
Trade-offs
- –Weaker inverter (-2,400W) limits appliance compatibility.
- –Sealed capacity — the SOLIX F3800 can add batteries to grow past 3,072Wh; this one can't.
Anker SOLIX F3800
Strengths
- +Larger battery capacity
- +Higher AC output
- +Faster solar charging
Trade-offs
- –Substantially more expensive (+$601) than the DELTA 3 Ultra.
- –Significantly heavier (+60.2 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
DELTA 3 Ultra
Each unit runs the 2,100Wh weekend without a recharge. The Anker takes it on margin, finishing at 64% of usable capacity against the Ultra's 80%, and that margin is worth a cold night and a rainy day with no sun. It is not worth hauling to the site. Nothing about this weekend needs the bigger battery; the Anker simply has more left when Sunday comes.
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
The Anker takes the blackout on headroom, ending at 50% of usable capacity against the Ultra's 63%, which also tells you either unit carries the 1,645Wh outage with charge in hand. The real question is what happens when the outage runs long, and that's a recharge question. The Anker's DC input accepts three times the wattage the Ultra's does, which is where it genuinely pulls ahead.
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 dead heat, and the numbers say so out loud: 320Wh is 12% of the Ultra's usable capacity and 10% of the Anker's, so capacity decides nothing here. What decides it is the machine sitting next to the bed. EcoFlow rates the DELTA 3 Ultra at 30 dBA. Anker publishes no noise figure for the F3800 at all, which is the one spec you actually came looking for.
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 strain. At these utilization levels the real difference is USB-C for direct laptop charging — 140W on the DELTA 3 Ultra against 100W — which beats the inverter for convenience 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
DELTA 3 Ultra
The SOLIX F3800 at 132.3 lbs is not a take-along — it rolls off a truck bed if it travels at all, so this scenario belongs to the DELTA 3 Ultra by default — and it earns it, covering the 670Wh with 1,941Wh to spare. Capacity was never the SOLIX F3800's problem here; getting to a tailgate was.
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 gets you through this day. A 4,685Wh draw needs 179% of the Ultra's usable capacity and 144% of the Anker's, so each one is flat before dinner. The F3800 at least has a route out, since add-on batteries stack onto its 3,840Wh base, but that's a second purchase and not something the base unit does. Plan on a daily recharge, or plan on a bigger system.
Battery budget usedlower = more headroom
LOAD Mini-Fridge 150W×24h · Laptop 60W×4h · Phone Charger 15W×3h · LED Lights 40W×5h · Fan 75W×8h
The Load Test
RUNTIME = (Wh × 0.85) ÷ LOAD
None of the scenarios above exactly yours? Build it. Toggle what you'd plug in; both units are tested against the combined draw.
Essentials
Comfort & Convenience
High-Draw Appliances
Test duration
8h
Continuous draw
205W
Projected runtime
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
August 2, 2026
Verdict: the EcoFlow DELTA 3 Ultra
Buy the DELTA 3 Ultra. It costs $1,399 against the F3800's $2,000, you can pick it up without help, and it hands back more total energy before it dies, because 4,000 cycles is a longer road than 3,000 even when the pack is smaller. The Anker out-scores it 6,237 to 5,072 on PowerScore and earns every point of that on continuous output, solar input and a port for add-on batteries. All three only pay off after the unit stops moving and gets wired to something. So the real question is whether you're installing a backup system or buying a power station, and if you'll ever pick the thing up, the $601 stays in your pocket.
Editor-assigned confidence, based on cited owner research and spec analysis.
List prices as of August 2, 2026. The links below open EcoFlow's and Anker's current prices.
$1,399.00 · direct from EcoFlow
Last checked 1 day ago. Prices move — check before you buy.
or check the SOLIX F3800 price$2,199.99 list
Written by Gunner Gustafson, Whole-Home Backup Tester · Station Arena Test Desk · Updated August 2, 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 4.7/5 (80th percentile of 26 Large-class units), and SOLIX F3800 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.
One Person, or Two
72.1 lb is a lift you do with bent knees and a clear path to the tailgate. One person, mildly annoyed, but done. 132.3 lb is not a lift, it's a project: two people, a route planned in advance, and a decision about where the box is going to sit for the next decade. Work out where it lives before you work out which specs matter.
DELTA 3 Ultra: Fixed Capacity
3,072Wh is what you own for the life of this unit. No expansion port, no add-on packs, and outgrowing it means buying a second power station. That covers every scenario on this page except a 4,685Wh van-life day, so it's a ceiling most buyers never touch. It is also the one place the F3800 has an answer the Ultra can't match at any price, and we'd rather flag it against our own pick than let you find it later.
Big Peak, or Room Above the Load
The Anker's 9,000W peak beats the Ultra's 7,200W outright. The ratios run the other way. 9,000W sitting on 6,000W of continuous is 1.5× of headroom, while 7,200W on 3,600W is a full 2×. Motors and compressors pull well over their rated draw the instant they start, so the Ultra has proportionally more room to swallow one while it's already working near its limit. The Anker just has a higher limit to work near.
UPS Switchover: ≤10ms vs ≤20ms
Both list a UPS mode, at different rated speeds. The DELTA 3 Ultra is rated ≤10ms — quick enough on paper that desktop PCs and routers should ride through, treating that as the rating it is. The SOLIX F3800 is rated ≤20ms — fine on paper for routers and most electronics; the fussiest PC power supplies sit right at this line. If a computer with unsaved work is the thing being protected, the stated class is worth the attention; nothing here is a lab result.
Warranty: No Difference
Both units carry the same 5-year warranty, so coverage isn't a tiebreaker here. Worth saying because the per-dollar framing can suggest otherwise: the DELTA 3 Ultra works out at 3.6 years of cover per $1,000 spent against the SOLIX F3800's 2.5, but that spread is the price gap, not the terms.
The Cheaper Pack Outlives the Expensive One
4,000 cycles at 3,072Wh is 12,288 kWh across the DELTA 3 Ultra's life. 3,000 cycles at 3,840Wh is 11,520 kWh across the F3800's. Cycled every day that's roughly 11 years against 8.2, and it's why the Ultra lands at $0.11 per lifetime kilowatt-hour against $0.17 despite holding the smaller charge. The bigger tank empties into a shorter road.
SOLIX F3800: Noise Level Not Disclosed
EcoFlow rates the DELTA 3 Ultra at 30 dBA. Anker publishes no dBA figure for the SOLIX F3800 at all. That's not evidence it's loud, but it does mean you can't compare on paper, and for anyone putting this in a bedroom, a home office, or beside a CPAP, it's the exact number they came looking for.
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. At the very top of the range, the DELTA Pro Ultra platform stacks batteries and inverters into whole-home backup — a flagship path, not a line-wide feature.
Worth knowing
EcoFlow runs the deepest ecosystem and the largest owner community in portable power, which mostly buys you accessories that actually exist and a fast answer to an odd question. The limit worth knowing up front: no parts and no service out of warranty. The 5-year window is the whole support story.
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
Sending a SOLIX F3800 back isn't a shipping label, it's a freight booking, because a unit this heavy ships as hazmat. Find out how your retailer handles that before you buy, not after something goes wrong.
Analyst note
Neither brand's support record is a reason to pick it. EcoFlow's is polarized: prepaid-label replacements and cheerful outcomes for some owners, long waits and refurbished units for others. Anker's SOLIX support is sliding from a historically excellent baseline, with reports of generic AI-agent replies and awkward return logistics on the heavy units. Buy from a retailer with a real return policy either way. On a machine this size that safety net is worth more than the warranty length, which is 5 years on each.
Growth path
DELTA 3 Ultra
FIXED CAPACITYFixed at 3,072Wh — 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 800W of solar. Suitable for a 1-2 panel setup.
Generous port selection supports complex multi-device setups.
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
The DELTA 3 Ultra is sealed at 3,072Wh, which is fine if that covers you. The SOLIX F3800 starts at 3,840Wh and can grow beyond it with Anker expansion batteries — real headroom the DELTA 3 Ultra doesn't have if your needs climb toward partial-home backup.
What Owners Report
Patterns from published owner reports and long-term reviews — every claim cited to its source below.
EcoFlow DELTA 3 Ultra
The field record here is reviewer testing rather than years of ownership, so read it as directionalA1A5A9. It's consistent on two things. The unit stays quiet with the inverter pushed to maximum, fans that never cross over into distractingA1A2. And the switchover behaves like a proper UPS: pull the wall plug mid-load and nothing dips, nothing dropsA5A6, and it doesn't throttle output down to match the input rate while it charges throughA4. One reviewer ran a laptop, a desktop workstation and monitors through a full working day and finished with charge to spareA8.
The complaints are small and specific. Overload it and the 30A port is the first thing to go, which matters if that's your RV feedA3. The display washes out in direct sunA11. Build quality gets praised over and over: the case, the AC cable, and the rear input covers that slide into their own slots instead of danglingA9A15.
“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
F3800 owners have more to say, and most of it is about the DC input. Panel compatibility is restrictive enough that third-party arrays don't work out, which pushes people toward Anker's pricier panels to hit the rated inputB1B2B13B14. One owner charges by solar only as a last resortB1. Another calls it a great unit apart from exactly thatB14. Two more constraints keep surfacing: no pass-through, so it won't take a charge from the AC input while it's dischargingB4, and a line cord that runs hot at the full wall-charge rate, hot enough that one owner permanently backed the rate down rather than sit and watch itB3.
The good news is real too. One owner running it through a Reliance transfer switch reports it carrying everything they've asked of it, water pump includedB5, and another prefers it outright to the EcoFlow firmware trouble they'd fought for monthsB10. Noise reports split: quiet in normal useB11, but with fans that cycle in and out on their own scheduleB12 and a brief buzz at heavy-load startup that Anker traced to a ferrite bead vibrating inside the caseB6B7. Support is a coin flip. One owner gets fast answers and an advance replacementB9. Another made a very large SOLIX purchase and then couldn't get a call backB8.
“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]
- A3
“One weird thing we noticed was the fact that the unit always seems to shut down the 30A port first when you overload the unit.”
thesolarlab.com — EcoFlow DELTA 3 Ultra Plus Review: The Ultimate DELTA? · 2025-09/10 (approx) · [mixed]
- 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]
- A8
“I was able to work remotely for an eight-hour day with 40% power left, which included running my laptop, desktop workstation and monitors.”
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]
- 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]
- B6
“I have 4 BP3800s and one of them made similar buzzing/rattling noise when a heavy AC load was starting up... only for around a second while inverter was ramping up.”
diysolarforum.com — 'Big issue with Anker Solix F3800 plus battery pack' · 2025-08 · [mixed]
- B7
“Anker support told me it was a ferrite bead vibrating inside the unit... This reduced the noise, initially. At some point, I moved the batteries around and now the noise is gone.”
diysolarforum.com — 'Big issue with Anker Solix F3800 plus battery pack' · 2025-08 · [mixed]
- 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]
- B10
“I've had zero issues - especially compared to the EcoFlow firmware issues I fought with for months.”
diysolarforum.com — 'Anker solix f-3800 diy solar array' · 2024-02 · [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]
- B12
“Sometimes the fans are completely silent, then they kick in and out intermittently.”
thesolarlab.com — 'Anker SOLIX F3800 Review: Did It Kill the Competition?' · unknown · [mixed]
- 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 August 2, 2026.
Who Should Buy Which
Buy the DELTA 3 Ultra if you…
- →You're the one lifting it. Trunk, truck bed, basement stairs, over a tailgate. The Ultra is a hard but honest one-person job and the Anker isn't a one-person job at all.
- →You cycle it daily. Run it down and back every day and the Ultra's rated life is about 11 years against the Anker's 8.2, for $601 less at the register.
- →It sleeps in your room. A CPAP night pulls 320Wh, so capacity was settled before you started reading; what's left is whether the fan wakes you, and EcoFlow at least publishes a number for that.
- →Your worst load runs under 3,600W. With 7,200W of surge on top you have double the headroom for a compressor kicking in near the top of that range.
Buy the SOLIX F3800 if you…
- →You're wiring it in. 6,000W continuous, 9,000W of surge and a footprint that isn't going anywhere describe a transfer-switch install, and one owner running exactly that reports it carrying everything including a water pumpB5.
- →You'll actually buy the add-on batteries. Growing past 3,840Wh is the one thing your money buys that the Ultra can't match at any price, and it's the only route to covering a 4,685Wh van-life day.
- →You already run Anker panels, or you're about to. The 2,400W input is the F3800's biggest genuine edge, but owners report that reaching it in practice means Anker's own glassB1B2B13B14.
- →Your loads simply exceed 3,600W. That's where the Ultra tops out, and if your list genuinely runs past it, price and weight stop being arguments.
If neither fits
If your day looks like the 4,685Wh van-life profile, close this tab. Neither of these covers it, and you'll spend more money learning that the hard way than you would committing to the F3800 plus add-on batteries or going straight to a house-battery build with a separate inverter and charge controller, which costs less per watt-hour at that scale anyway. At the other end: if your real loads look like a tailgate at 670Wh or a CPAP night at 320Wh, 3,072Wh is far more battery than you'll ever discharge. Shop a size class down, keep the difference, and save your back.
The Bottom Line
The DELTA 3 Ultra wins this, and the $601 is the least of it. The Anker holds more per charge and gives back less across the years, because 4,000 cycles is a longer road than 3,000 even when the pack is smaller. Add a unit one person can carry, twice its continuous rating in surge headroom, and a published noise figure, and the case is closed for anyone who isn't installing a backup system.
The F3800 isn't overpriced, it's a different machine. Continuous output the Ultra can't reach, three times the solar input, and a path past 3,840Wh are exactly what a wired-in home backup needs, and no amount of money turns the Ultra into that. If that's your install, pay the premium and budget for Anker's own panelsB2 and for a unit that won't take an AC charge while it's workingB4. If you're ever going to pick the thing up, get the Ultra.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Is the Anker SOLIX F3800 worth $601 more than the EcoFlow DELTA 3 Ultra?
Only if you'll use something the Ultra can't do: 6,000W of continuous output instead of 3,600W, three times the solar input, or add-on batteries past 3,840Wh. If none of that is in your plan, the Ultra is the better buy at $1,399, and it delivers more total energy over its life because 4,000 cycles beats 3,000 by more than the Anker's bigger pack makes up. Cheaper today, and still working later.
Can you add extra batteries to the EcoFlow DELTA 3 Ultra?
No. It's sealed at 3,072Wh with no expansion port, so what you buy is the ceiling for the life of the unit. The SOLIX F3800 is the one in this pair that takes add-on batteries, starting from its 3,840Wh base. If there's any real chance your load list grows toward partial-home backup, that's the strongest argument on this page for the Anker.
Which is better for whole-home or transfer-switch backup?
The SOLIX F3800, and it isn't close. Its 6,000W continuous and 9,000W surge cover loads the Ultra's 3,600W simply won't start, and one owner running it through a Reliance transfer switch reports it handling everything asked of it, water pump included. Budget for the trade-offs: it weighs 132.3 lb, and owners report it won't take an AC charge while it's discharging.
Which one is quieter for a bedroom or CPAP setup?
The DELTA 3 Ultra, on the evidence available. EcoFlow rates it at 30 dBA and reviewers describe the fans as unobtrusive even with the inverter at full output. Anker publishes no dBA figure for the F3800 at all, and owners describe its fans cycling in and out intermittently. Capacity isn't the question at this size: a CPAP night pulls about 320Wh, 12% of what the Ultra can actually give you.
How fast does each one recharge from solar?
About 1.5 hours for the F3800 at its full rated input (3,840Wh ÷ 2,400W) and about 4 hours for the DELTA 3 Ultra (3,072Wh ÷ 800W), so on paper the Anker is the multi-day-outage machine. The catch is reaching that rated input: owners consistently report the F3800's DC input is restrictive with third-party panels and effectively pushes you to Anker's own. Price that array in before you count the faster number as settled.
Where to buy
EcoFlow DELTA 3 UltraPick
$1,399.00
$1,399.00 · direct from EcoFlow
Last checked 1 day ago. Prices move — check before you buy.
Anker SOLIX F3800
$2,199.99
$2,199.99 · direct from Anker
Last checked 1 day ago. Prices move — check before you buy.
Prices may vary by retailer and are subject to change.