Head-to-head test
EcoFlow DELTA 3 Ultra Plus vs EcoFlow DELTA 3800 Gen4Bigger Battery, Lighter Box. Why Isn't It the Easy Pick?
The DELTA 4 (3800) fits 691 Wh more battery in a box 6.8 lb lighter, but each watt-hour costs more. I'd buy the Ultra Plus, unless your outages run two nights or you cycle it on solar every day.
Black Friday · 23 days out
Price to beat:DELTA 3 Ultra Plus $1,499
The lowest we have recorded. A Black Friday price above it is a sale this unit has already had.
Full profiles: EcoFlow DELTA 3 Ultra Plus → · EcoFlow DELTA 3800 Gen4 →
Written by Gunner GustafsonUpdated
Whole-Home Backup Tester, Station Arena Test Desk
Spec deltas
Gunner’s take
Whole-Home Backup Tester
EcoFlow made the new box bigger and lighter at once.
The DELTA 4 (3800) holds 3,763 Wh and weighs 67.5 lbB1B7. The DELTA 3 Ultra Plus holds 3,072 Wh and weighs 74.3 lb. That's 691 Wh more battery in a box 6.8 lb lighter.
The inverter no longer separates them.
Both run 3,600 W continuously with a 7,200 W surgeB2, so anything that starts on one starts on the other. What's left to argue about is battery, sun and money.
You pay more per watt-hour for the bigger battery.
The Ultra Plus sells for $1,599 and the DELTA 4 (3800) is listed at $2,199, $600 more for those 691 Wh. EcoFlow says the DELTA 4 ships in late NovemberB10. Whether the extra battery is worth it depends on how long your nights get.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
That leftover is 94% of a second night on the DELTA 4 and 59% on the Ultra Plus. In a two-night outage the DELTA 4 gets through the second evening nearly on its own, and its two solar inputs refill it faster the next morning. The Ultra Plus needs sun or a generator before the second dinner.
8-Hour Blackout needs 1,645 WhLeft over: 1,554 Wh on the DELTA 4 (3800), 966 Wh on the Ultra PlusDELTA 4 (3800): two solar inputs, 2,000 W in allB5
Why it mattersIf your outages run two nights, this is the reason to pay for the bigger box.
Capacity
Because both expand, the bigger base battery isn't the only road to more energy. Someone planning for long outages can start with the Ultra Plus and add an extra battery when the budget allows, and the DELTA 4's 691 Wh lead becomes a small share of either total.
DELTA 3 Ultra Plus: 3,072 Wh at $1,599DELTA 4 (3800): 3,763 Wh at $2,199Both take EcoFlow extra batteries; the DELTA 4 (3800) takes up to twoB6
Why it mattersIf you're buying battery by the dollar, price the Ultra Plus plus an extra battery before you pay the gap.
rated cycles
A box cycled daily from solar uses both of its advantages: the bigger solar input refills it within the day, and the longer rating keeps it going years past the Ultra Plus. A backup box that empties a few times a year uses neither, and still pays for both.
DELTA 4 (3800): rated for 6,000 cycles; DELTA 3 Ultra Plus: 4,000At one full cycle a day: 16.4 years against 11Solar input: 2,000 W across two inputs against 1,600 WB5
Why it mattersDaily off-grid use is where the DELTA 4 (3800) earns its price; storm backup isn't.
The specific dimensions that decide these two units — everything else is a tie.
Your Life, Your Pick
Selected because: The DELTA 4 (3800) takes the two scenarios where leftover battery counts; the rest go to both or neither.
Capacity only splits them when the night runs long. The 8-hour blackout uses 1,645 Wh, and both finish it. The DELTA 4 (3800) ends with nearly a second night in hand. The Ultra Plus ends with a bit over half of one.
Camping goes the same way. Weekend Camping needs 2,100 Wh. The Ultra Plus finishes with 511 Wh spare and the DELTA 4 (3800) with 1,099 Wh, more than twice the cushion. The CPAP night, the workday and the tailgate fit easily in either, and Van Life Daily at 4,685 Wh is past both.
Growth Path
Selected because: Both take EcoFlow extra batteries, so the bigger base battery isn't the only road to more.
solar input
Both expand, which takes some air out of the DELTA 4's lead. EcoFlow lets the DELTA 4 (3800) add two extra batteries, the DELTA Pro 3's or the 2,048 Wh DELTA 3 Max Plus's, and quotes 4 to 12 kWh in allB6. The Ultra Plus takes EcoFlow's extra batteries too. Once one is attached, 691 Wh is a small share of the total.
Our record carries no ceiling for the Ultra Plus, so I won't guess one. If you're building toward a big home kit, check which extra batteries each one takes before you buy. If you never will, the bigger base battery is the DELTA 4's honest advantage.
What the Specs Don't Tell You
Selected because: Same inverter and switchover; the cycle ratings and the weight are where they differ.
rated cycles
The inverter fight is over. Both run 3,600 W with a 7,200 W surge and switch to battery within 10 ms. A fridge, a sump pump and a furnace blower start on either, so motors don't decide this one.
The cycle rating is the DELTA 4's long-game advantage. EcoFlow rates it for 6,000 cycles against 4,000, which at one cycle a day is 16.4 years against 11. Weight barely registers: 67.5 lb against 74.3 lb, and both are a two-handed, bent-knees lift into a car.
In the makers’ pictures
What you’d actually be living with
Every port, labelled
What plugs in where, and how much it takes
EcoFlow DELTA 3 Ultra Plus
Front panel
- 1USB-C · 140 WOutUp to 140 W (up to 28 V at 5 A), printed on the panel and in EcoFlow’s specs.
- 22× USB-C · 45 WOutTwo USB-C ports printed 45W. EcoFlow’s specs say 45 W per port and 45 W in total.
- 3USB-A · 18 WOutUp to 18 W, printed on the panel.
- 4AC 1 · 2× 20 AOutTwo T-slot 120 V outlets, 20 A each, printed AC 1 with their own AC 1 on/off button. All the AC outlets share 3,600 W continuous and a 7,200 W surge.
- 5AC 2 · 2× 20 AOutTwo more T-slot 120 V outlets, 20 A each, on the group printed AC 2, switched by the AC 2 button.
- 630 A RV outletOutAn RV outlet marked 30A MAX, joined to the AC 2 group on the panel. A camper’s shore-power cord plugs straight in.
Photo: EcoFlow · Product image, EcoFlow US store · numbers and labels are ours. Port ratings printed on EcoFlow’s panel and in the specs on EcoFlow’s US store page for the Plus.
Rear panel
- 1AC inInThe AC charging inlet: 100–120 V at 15 A, by EcoFlow’s specs.
- 2Charge-speed switchInSwitches AC charging between FAST and ADJUST, as printed beside it.
- 32× Solar in · 1,600 WInTwo XT60 inputs, each printed 11–60 V, 18 A max. EcoFlow puts the most solar the unit takes at 1,600 W.
- 4Battery portIn · OutTakes EcoFlow’s DELTA 3 Max Plus or DELTA Pro 3 Smart Extra Battery; EcoFlow puts the expanded range at 3 to 11 kWh.
- 5Anderson · 12 V 30 AOutA 12 V DC port rated 30 A (12.6 V, 378 W), shared with the car socket.
- 612 V car socket · 10 AOutA 12 V car socket rated 10 A (126 W), sharing power with the Anderson port. A button printed 12V ON/OFF sits beside it.
Photo: EcoFlow · Product image, EcoFlow US store · numbers and labels are ours. Port names and solar ratings printed on EcoFlow’s panel; the rest from the specs on EcoFlow’s US store page for the Plus.
EcoFlow DELTA 3800 Gen4
Front panel
- 1USB-C · 140 WOutUp to 140 W (USB-PD up to 28 V at 5 A). The port for a laptop.
- 22× USB-C · 65 WOutUp to 65 W each. EcoFlow says these two and the USB-A share 16 W when two or more are in use at once.
- 3USB-A · 36 WOutUp to 36 W (5, 9 or 12 V at 3 A).
- 430 A twist-lockOutA three-slot twist-lock marked 30A MAX, rated 30 A at 120 V on the US unit.
- 54× 20 A outletsOutFour T-slot 120 V outlets rated 20 A each, sharing 3,600 W continuous and a 7,200 W surge.
Photo: EcoFlow · Product image, EcoFlow Japan store · numbers and labels are ours. Ratings from EcoFlow’s US spec table; outlet shapes read by us from EcoFlow’s picture, taken of the Japanese unit, which shares the US panel.
Input side
- 12× Solar/DC in · 1,000 WInTwo inputs, each 11 to 60 V, up to 20 A, 1,000 W: 2,000 W of panels in all.
- 2AC in · 1,800 WIn100–120 V at 15 A. Charges at up to 1,800 W, which at 120 V is the whole of an ordinary 15 A circuit.
- 3Battery portIn · OutTakes up to two of EcoFlow’s DELTA 3 Max Plus or DELTA Pro 3 extra batteries; EcoFlow quotes 4–12 kWh.
Photo: EcoFlow · Product image, EcoFlow Japan store · numbers and labels are ours. Ratings from EcoFlow’s US spec table and the panel’s own printing.
Strengths & trade-offs
EcoFlow DELTA 3 Ultra Plus
Strengths
- +Costs $600 less
Trade-offs
- –Shorter-lived battery — rated for 4,000 charge cycles vs the DELTA 3800 Gen4's 6,000, so it wears out sooner.
EcoFlow DELTA 3800 Gen4
Strengths
- +Lighter by 6.8 lb
- +Larger battery capacity
- +Faster solar charging
- +Rated for 6,000 charge cycles — much longer battery lifespan
Trade-offs
- –Substantially more expensive (+$600) than the DELTA 3 Ultra Plus.
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 3800 Gen4
Both cover the 2,100 Wh weekend. The DELTA 4 (3800) ends it with 1,099 Wh spare, more than twice the Ultra Plus's 511 Wh.
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
DELTA 3800 Gen4
Both finish the 1,645 Wh night. The DELTA 4 (3800) wakes up with 1,554 Wh left, nearly a second night. The Ultra Plus has 966 Wh, a bit over half of one.
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 CPAP is about 40W for eight hours, so both of these cover the night several times over — capacity isn't the question here. The only published difference is fan noise, and it can't settle this: the DELTA 3 Ultra Plus is rated 30dB and the DELTA 3800 Gen4 40dB, but the DELTA 3 Ultra Plus's is its maker's best case and the DELTA 3800 Gen4's is EcoFlow's maximum under heavy charge and discharge, so at a 40W draw the real gap can only be narrower than it looks, and may even run the other way. Neither settles which box is quieter at a bedside. Buy whichever is cheaper or easier to carry.
Battery budget usedlower = more headroom
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, and their USB-C output is a wash — pick on weight, ports, or price.
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
Game day uses about a quarter of either battery, so capacity can't split them. The tiebreak is the carry, and the DELTA 4 (3800) is 6.8 lb lighter.
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 covers 4,685 Wh alone. The DELTA 4 (3800) gets 68% of the way and the Ultra Plus 56%. Both take extra batteries, so plan on one for either.
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: DELTA 3800 Gen4 runs 15.6h vs 12.7h.
$2,199 list · direct from EcoFlow
Planning for more than this? Describe your whole setup and get it sized →
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 0–213.2hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–42.6hHigh-Draw Appliances
These reveal the real limitsscale 0–3.2h¹ 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
November 4, 2026
Verdict: the EcoFlow DELTA 3 Ultra Plus
I'd buy the DELTA 3 Ultra Plus, unless your outages run two nights or you cycle it daily on solar. Both run 3,600 W with a 7,200 W surgeB2, so this is battery against money. The DELTA 4 (3800) holds 3,763 Wh against 3,072 Wh, weighs 6.8 lb less and takes 2,000 W of solar against 1,600 WB5. At $2,199 against $1,599 it also costs more per watt-hour, and the Ultra Plus takes extra batteries too. If a sale brings the DELTA 4 down to the Ultra Plus's price per watt-hour, buy the DELTA 4.
Editor-assigned confidence, based on cited owner research and spec analysis.
List prices as of November 4, 2026. The links below open EcoFlow's current price.
$1,599.00 · direct from EcoFlow
Last checked 31 days ago. Prices move — check before you buy.
or check the DELTA 3800 Gen4 price$2,199.00 list
Written by Gunner Gustafson, Whole-Home Backup Tester · Station Arena Test Desk · Updated November 4, 2026
Measured Data
Benchmark scores and the full spec record, side by side.
Benchmark scores
Not rated for both units (minimum threshold unmet): Apartment Balcony.
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 Plus rates 4.9/5 (93rd percentile of 29 Large-class units), and DELTA 3800 Gen4 rates 4.1/5 (48th percentile of 22 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.
Lighter, Still Heavy
The DELTA 4 (3800) is 67.5 lb and the DELTA 3 Ultra Plus is 74.3 lb. Both are two-handed, bent-knees lifts. The 6.8 lb is welcome, and it doesn't make either one a grab-and-go box.
Warranty: No Difference
Both units carry the same 5-year warranty, so coverage isn't a tiebreaker here. Both figures are maximums rather than guarantees — they depend on registering the unit in the EcoFlow app, which adds two years to a three-year standard term. Worth saying because the per-dollar framing can suggest otherwise: the DELTA 3 Ultra Plus works out at 3.1 years of cover per $1,000 spent against the DELTA 3800 Gen4's 2.3, but that spread is the price gap, not the terms.
Where the Bigger Box Pulls Ahead
EcoFlow rates the DELTA 4 (3800) for 6,000 cycles and the DELTA 3 Ultra Plus for 4,000. At one cycle a day, that's 16.4 years against 11. A box that comes out for storms will never get near either, so this only counts if you cycle it daily.
Full record above — the Test Desk pick is the DELTA 3 Ultra Plus.
Check DELTA 3 Ultra Plus price →or check the DELTA 3800 Gen4 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 Plus is cheaper to buy, but the DELTA 3800 Gen4 is cheaper to own. At $0.10/kWh over its lifetime vs $0.13/kWh, the DELTA 3800 Gen4's higher cycle life and capacity make each dollar go further over the years.
Growth path
DELTA 3 Ultra Plus
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.
Adequate ports for most setups, but heavy users may want a power strip.
Expansion batteries are EcoFlow-specific. You're investing in the EcoFlow ecosystem.
DELTA 3800 Gen4
EXPANDABLESupports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 3,763Wh.
Accepts up to 2,000W of solar. Enough for a serious multi-panel array.
Adequate ports for most setups, but heavy users may want a power strip.
Expansion batteries are EcoFlow-specific. You're investing in the EcoFlow ecosystem.
Realistic full solar rechargeat 70% of rated panel output — see methodology
Analyst note
Both expand, so neither locks you out of growth — decide on capacity, price, and the rest, not the expansion checkbox.
What Owners Report
Patterns from published owner reports and long-term reviews — every claim cited to its source below.
EcoFlow DELTA 3 Ultra Plus
Reviewers like how quietly it runs and how it's built. Several describe the fan as quieter than older EcoFlow models even under heavy loadA1A2A13, and one found the shell, buttons and cable substantial rather than fragileA8. One worked a full eight-hour day off it, laptop, desktop and monitors, and finished with 40% leftA5.
The complaints are small, and they come from reviewers rather than owners. One noticed it shuts the 30 A outlet off first when overloadedA3, and another had to shade the screen with a hand in sunA7. Pass-through charging drew no complaintsA4A6. Our research found no long-term owner reports yetA0.
“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 · storagereview.com
EcoFlow DELTA 3800 Gen4
Nobody owns a DELTA 4 (3800) yet. EcoFlow put it on sale in the US on November 4 and says it ships in late NovemberB10. Everything here is EcoFlow's store page plus our own arithmeticB0B5.
I'd want to load both solar inputs on a short winter day. If I had one, I'd put a different brand's panels on each input, since each takes 11 to 60 VB5, and log what it actually gathers by sundown. EcoFlow says it runs a refrigerator for up to 70 hoursB12, and that's the second claim I'd check, because the second night is the whole case for this box.
“Capacity 3,763 Wh, LFP (LiFePO4) cells. EcoFlow sells it as the DELTA 3800 Gen4; buyers and the press call the pair the DELTA 4.”
Sources
us.ecoflow.co · jp.ecoflow.co
Sources & Research Notes
Every owner claim in this report is traceable to a published source. The bracketed references above resolve here.
Recurring owner themes
- Professional reviewers consistently describe the fan noise as very quiet even under heavy load, comparable to EcoFlow's premium DELTA Pro Ultra line. [DELTA 3 Ultra Plus · 3 entries]
- Reviewers report solid UPS/pass-through charging performance with no noticeable switchover issues or output throttling tied to input wattage. [DELTA 3 Ultra Plus · 2 entries]
- The unit's high weight (~74 lbs) and premium MSRP are repeatedly flagged as drawbacks, though discounted street pricing is seen as making the value proposition much stronger. [DELTA 3 Ultra Plus · 3 entries]
- Build quality/durability is praised as substantial and non-fragile across multiple independent reviews. [DELTA 3 Ultra Plus · 2 entries]
- Launch-day ledger: every entry is EcoFlow's own US store and documentation, or our labelled arithmetic. No owner or reviewer evidence exists yet. [DELTA 3800 Gen4 · 12 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? · unknown · [positive]
- A2
“we'd probably say the noise it creates is similar to what you hear when you run the DELTA Pro Ultra, which is pretty amazing”
thesolarlab.com — EcoFlow DELTA 3 Ultra Plus Review: The Ultimate DELTA? · unknown · [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? · unknown · [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? · unknown · [positive]
- A5
“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]
- 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]
- A7
“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 · [mixed]
- A8
“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”
appleinsider.com — EcoFlow Delta 3 Ultra Plus review: Premium, but solid power · 2025-11 · [positive]
- A13
“Each unit operates quietly at under 25dB, remaining unobtrusive even during sustained loads”
storagereview.com — EcoFlow DELTA 3 Max Plus & Ultra Plus Review · 2025-09-30 · [positive]
- B1
“Capacity 3,763 Wh, LFP (LiFePO4) cells. EcoFlow sells it as the DELTA 3800 Gen4; buyers and the press call the pair the DELTA 4.”
EcoFlow US store, us.ecoflow.com/products/delta-3800-gen4 (spec table, features and FAQ, read 2026-11-04) · 2026-11-04 · [mixed]
- B2
“US unit: 120 V AC, 60 Hz; rated 3,600 W continuous with a 7,200 W surge. It supports X-Boost (EcoFlow refers to the manual for the US X-Boost figure); X-Boost is unavailable while the unit charges from the wall or runs in bypass.”
EcoFlow US store, us.ecoflow.com/products/delta-3800-gen4 (spec table, features and FAQ, read 2026-11-04) · 2026-11-04 · [mixed]
- B3
“AC outlets: 5 total, four rated 20 A max and one rated 30 A max (on EcoFlow's product images, four T-slot outlets and a three-slot twist-lock). USB-A: one port, 36 W max. USB-C: one at 140 W max and two at 65 W max; the two 65 W ports share circuitry with the USB-A, limited to 16 W total when used together. No 12 V car socket.”
EcoFlow US store, us.ecoflow.com/products/delta-3800-gen4 (spec table, features and FAQ, read 2026-11-04) · 2026-11-04 · [mixed]
- B5
“Solar: two inputs, 11–60 V DC at up to 20 A and 1,000 W each, 2,000 W total (XT60i; two XT60i-to-LP60 cables are in the box). EcoFlow lists six charging methods; its 800 W Alternator Charger is limited to 500 W through the Solar/DC port.”
EcoFlow US store, us.ecoflow.com/products/delta-3800-gen4 (spec table, features and FAQ, read 2026-11-04) · 2026-11-04 · [mixed]
- B6
“Extra Battery Port: up to two extra batteries through EcoFlow's Smart Extra Battery Expansion Adapter. Compatible: the DELTA Pro 3 Smart Extra Battery and the DELTA 3 Max Plus (2,048 Wh) Smart Extra Battery. EcoFlow quotes 4–12 kWh of expandable capacity.”
EcoFlow US store, us.ecoflow.com/products/delta-3800-gen4 (spec table, features and FAQ, read 2026-11-04) · 2026-11-04 · [mixed]
- B7
“Weight 67.5 lb (30.6 kg); 16.77 × 11.36 × 12.09 in without handles, 18.76 in long with them. A handle at each end; EcoFlow sells a folding transport cart separately ($109 at launch, listed at $199). EcoFlow calls it the smallest and lightest portable power station in its class (3–4 kWh and 3,600 W).”
EcoFlow US store, us.ecoflow.com/products/delta-3800-gen4 (spec table, features and FAQ, read 2026-11-04) · 2026-11-04 · [mixed]
- B10
“On sale at us.ecoflow.com from November 4, 2026 at $2,199; EcoFlow says it ships in late November. Kits: with two 160 W solar panels $2,899; with a DELTA 3 Max Plus extra battery (6 kWh in all) $2,999. EcoFlow also sells it in Japan, where it went on sale October 30 at ¥240,900.”
EcoFlow US store, us.ecoflow.com/products/delta-3800-gen4 (spec table, features and FAQ, read 2026-11-04) · 2026-11-04 · [mixed]
- B12
“Powers a refrigerator for up to 70 hours, which EcoFlow says is 17 hours (32.6%) longer than the industry average for 3–4 kWh portable power stations. Both figures are EcoFlow's own claims, not our measurement.”
EcoFlow US store, us.ecoflow.com/products/delta-3800-gen4 (spec table, features and FAQ, read 2026-11-04) · 2026-11-04 · [positive]
Research compiled November 4, 2026.
Who Should Buy Which
Buy the DELTA 3 Ultra Plus if you…
- →You want the cheaper watt-hour. $1,599 for 3,072 Wh, and it still takes extra batteries.
- →It lives in an RV or a truck. The 30 A outlet is the RV kind, and there's a 12 V car socket the DELTA 4 (3800) doesn't haveB3.
- →Your outages last an evening. The 8-hour blackout leaves it 966 Wh to spare.
- →You need it now. EcoFlow says the DELTA 4 (3800) ships in late NovemberB10.
Buy the DELTA 3800 Gen4 if you…
- →Your outages run two nights. It ends the 8-hour blackout with 94% of a second night left.
- →It cycles daily on solar. Two inputs take 2,000 W in allB5, and it's rated for 6,000 cycles.
- →You want the most battery before adding a second box. 3,763 Wh against 3,072 Wh, and 6.8 lb lighter.
If neither fits
If you need 240 V for a well pump or a dryer, neither has it. Look at a unit with 240 V outlets instead. And if your day looks like Van Life Daily at 4,685 Wh, plan on an extra battery from the start with either.
The Bottom Line
I'd buy the DELTA 3 Ultra Plus. Same inverter, an RV outlet and a car socket, room to expand, and the cheaper watt-hour of the two.
Pay for the DELTA 4 (3800) if your outages run two nights or your panels run it every day. That's where the second night and the 6,000-cycle rating stop being specs and start being the reason.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Is the DELTA 4 (3800) bigger than the DELTA 3 Ultra Plus?
Yes. It holds 3,763 Wh against 3,072 Wh, which is 691 Wh more. It is also lighter, at 67.5 lb against 74.3 lb.
How much does the DELTA 4 (3800) cost in the US?
EcoFlow lists it at $2,199 on its US store and says it ships in late November. The DELTA 3 Ultra Plus sells for $1,599.
Which one has more power output?
They match. Both run 3,600 W continuously with a 7,200 W surge, so anything one can start, the other can too.
Can both take extra batteries?
Yes. The DELTA 4 (3800) takes up to two, from the DELTA Pro 3 or DELTA 3 Max Plus lines, and EcoFlow quotes 4 to 12 kWh in all. The DELTA 3 Ultra Plus also takes EcoFlow's extra batteries.
Is the DELTA 4 (3800) worth the extra money?
For two-night outages or daily solar use, yes. It ends an 8-hour blackout with 94% of a second night left and is rated for 6,000 cycles against 4,000. For evening outages and occasional use, the DELTA 3 Ultra Plus gives you more battery per dollar.
Where to buy
EcoFlow DELTA 3 Ultra PlusPick
$1,599.00
$1,599.00 · direct from EcoFlow
Last checked 31 days ago. Prices move — check before you buy.
EcoFlow DELTA 3800 Gen4
$2,199.00
$2,199.00 · direct from EcoFlow
Prices may vary by retailer and are subject to change.