Head-to-head test
EcoFlow DELTA 3800 Gen4 vs EcoFlow DELTA Pro UltraMore Lifetime Energy Than the Pro Ultra. So What Does It Lack?
EcoFlow DELTA 3800 Gen4 vs EcoFlow DELTA Pro Ultra: 3,763 Wh against 6,144 Wh, but the DELTA 4 (3800) takes extra batteries and is rated for 6,000 cycles to 3,500. No battery adds watts: it runs 3,600 W to the Pro Ultra's 7,200 W, with no 240 V outlet. Buy the DELTA 4 (3800) unless a well pump or central air needs the bigger inverter.
Black Friday · 23 days out
Price to beat:DELTA Pro Ultra $3,989
The lowest we have recorded. A Black Friday price above it is a sale this unit has already had.
Full profiles: EcoFlow DELTA 3800 Gen4 → · EcoFlow DELTA Pro Ultra →
Written by Gunner GustafsonUpdated
Whole-Home Backup Tester, Station Arena Test Desk
Spec deltas
Gunner’s take
Whole-Home Backup Tester
The battery gap is one you can close later.
The DELTA 4 (3800) holds 3,763 Wh and the DELTA Pro Ultra holds 6,144 Wh. The DELTA 4 (3800) has a port for up to two extra batteries, and EcoFlow quotes 4 to 12 kWh of expandable capacityA6.
The inverter gap is not.
The Pro Ultra runs 7,200 W, surges to 10,800 W and has a 240 V outlet, the voltage central air and a deep well pump run on. The DELTA 4 (3800) runs 3,600 W from 120 V outletsA2. No battery changes either number.
The surprise is in the cells.
EcoFlow rates the DELTA 4 (3800) for 6,000 cycles and the Pro Ultra for 3,500, so the smaller pack is rated to move more energy over its life. It lists at $2,199 and EcoFlow says it ships in late NovemberA10. The Pro Ultra sells for $4,199.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
Capacity
Capacity stops being the reason to buy the Pro Ultra. You can start at 3,763 Wh and buy the battery the year you find you need it. EcoFlow sells the pair as a kit that still lists below the Pro UltraA10. The Pro Ultra asks for 6,144 Wh on day one, whether the house uses it or not.
DELTA 4 (3800): 3,763 Wh, port for up to two extra batteriesA6DELTA 3 Max Plus extra battery: 2,048 Wh; EcoFlow's kit with one comes to 6 kWh in allA6A10DELTA Pro Ultra: 6,144 Wh baseVan Life Daily: the DELTA 4 (3800) runs 1,486 Wh short on its own battery
Why it mattersIf storage is your only worry, buy the smaller box and grow it.
rated cycles
The Pro Ultra's advantage is energy per night, not energy per lifetime. Cycled once a day on solar, the DELTA 4 (3800)'s rating runs 16.4 years against 9.6. For a cabin or a shop that drains and refills the battery daily, the cheaper box is also the one with more years in its cells.
DELTA 4 (3800): rated for 6,000 cycles at 3,763 Wh a cycleDELTA Pro Ultra: rated for 3,500 cycles at 6,144 Wh a cycleRated lifetime energy: 22,578 kWh against 21,504 kWh
Why it mattersIf you'll cycle it every day, the cycle rating favors the DELTA 4 (3800). If it only comes out for outages, the cycle count won't decide anything for you.
continuous output
Batteries add hours. They don't add watts. Owner reviews at Home Depot describe the Pro Ultra running a 3-ton central ACB4. On the DELTA 4 (3800), a 240 V compressor doesn't start however many batteries sit beside it.
DELTA Pro Ultra: 7,200 W continuous, 10,800 W surge, one 240 V outletDELTA 4 (3800): 3,600 W continuous, 7,200 W surge, no 240 V outletHome Depot owner reviews say the Pro Ultra runs a 3-ton central ACB4
Why it mattersCount your 240 V loads before you count kilowatt-hours.
The specific dimensions that decide these two units — everything else is a tie.
Growth Path
Selected because: Both take extra batteries, so storage here is a budget question, not a ceiling.
solar input
This is where the DELTA 4 (3800) closes the gap. It takes up to two extra batteries through EcoFlow's expansion adapter, either the DELTA 3 Max Plus battery at 2,048 Wh or the DELTA Pro 3 batteryA6. EcoFlow's own kit pairs it with one Max Plus battery for 6 kWh in allA10, just short of the Pro Ultra's base.
The Pro Ultra still grows further, and faster from the sun. EcoFlow says a full system reaches 90 kWhB1, and it takes up to 5,600 W of solar against the DELTA 4 (3800)'s 2,000 W across two inputs. That matters for a roof array, and someone planning one is already shopping for a home system.
What the Specs Don't Tell You
Selected because: The Pro Ultra surges to 10,800 W against 7,200 W, and no extra battery closes that gap.
rated cycles
Here's what no battery fixes. The Pro Ultra surges to 10,800 W against 7,200 W, runs 7,200 W against 3,600 W and has the only 240 V outlet here. A well pump's startup spike is exactly what those numbers are for. The DELTA 4 (3800) still starts a fridge, a sump pump or a furnace blower with room left.
Lifetime Value
Selected because: 6,000 rated cycles against 3,500, so the smaller pack is rated to move more energy over its life.
cost / lifetime kWh
Over its rated life, the smaller pack moves more energy. The Pro Ultra's cycles are bigger, but the DELTA 4 (3800) gets 6,000 of them to its 3,500. The totals land close, and the smaller box gets there for less money.
That makes each lifetime kilowatt-hour about half the price, $0.10 on the DELTA 4 (3800) against $0.20 on the Pro Ultra. You only collect it if you cycle the battery often, on solar every day at a cabin, say. A box that waits in the garage for two outages a year will never get near either cycle count.
Your Life, Your Pick
Selected because: Van Life Daily is the one the DELTA 4 (3800) misses on its own battery, by 1,486 Wh.
The Pro Ultra wins the long jobs, and the DELTA 4 (3800) wins the trips. The Pro Ultra takes the blackout, the workday and van life. The DELTA 4 (3800) takes camping and the tailgate, because the Pro Ultra doesn't leave the garage. In the blackout it still ends with 1,554 Wh, 94% of a second night.
Van life is the miss, and it's fixable. It needs 4,685 Wh, and the DELTA 4 (3800) runs 1,486 Wh short on its own. One DELTA 3 Max Plus battery holds 2,048 WhA6, more than the shortfall even after the same allowance for losses.
Portability & Form Factor
Selected because: 67.5 lb against 181.8 lb, and every extra battery is another box.
weight
The DELTA 4 (3800) is a two-handle lift. The Pro Ultra is an install. At 67.5 lb it has a handle at each end, and EcoFlow sells a folding cart for itA7. The Pro Ultra is 181.8 lb across its boxes and gets set up once.
Growing it changes the sum. Each extra battery is another box, so a grown DELTA 4 (3800) becomes a stack you leave by the panel. The main unit can still travel alone, which is more than the Pro Ultra offers.
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 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.
EcoFlow DELTA Pro Ultra
Front panel
- 12× USB-C · 100 WOutTwo USB-C ports behind the flap printed USB-C: up to 100 W each, 200 W together.
- 22× USB-A · 12 WOutTwo USB-A ports behind the flap printed USB-A: 5 V at 2.4 A, 12 W each, 24 W together.
The four covers below the screen are printed 120V 20A - BACKUP UPS, 120V 20A - ONLINE UPS, 120V 30A - ONLINE UPS and 120V/240V 30A; the outlets behind them are mapped below. The door at the right end covers the side panel, also mapped below; EcoFlow’s manual puts a port for its 4G dongle behind the left one.
Photo: EcoFlow · Product image, EcoFlow US store · numbers and labels are ours. Port names printed on EcoFlow’s panel; ratings from EcoFlow’s US spec table.
Outlets and side panel
- 14× 20 A outletsOutFour NEMA 5-20 outlets, 120 V at 20 A each. The covers are printed 120V 20A - BACKUP UPS over the left pair and 120V 20A - ONLINE UPS over the right pair: EcoFlow rates online UPS at 0 ms and backup UPS under 20 ms. All the AC outlets share 7,200 W.
- 2TT-30 RV · 30 AOutA TT-30 RV outlet, 120 V at 30 A, printed 120V 30A - ONLINE UPS. A camper’s 30 A cord plugs straight in.
- 3L14-30 · 120/240 VOutA NEMA L14-30 twist-lock, 120/240 V at 30 A, printed 120V/240V 30A. On backup UPS (under 20 ms).
- 412 V DC out · 378 WOutA DC output, 12.6 V at 30 A, 378 W max. EcoFlow’s manual says it supports car-socket (cig lighter) appliances.
- 5Low-PV solar in · 1,600 WInThe low-voltage solar input: 30–150 V at 15 A, up to 1,600 W. EcoFlow includes a cable from MC4 panels to this port.
- 6AC inInThe AC charging inlet: 100–120 V at 15 A, or 200–240 V at 12.5 A. The small switch above it sets the charging speed.
- 7High-PV solar in · 4,000 WInThe high-voltage solar input, with the PV switch that turns solar charging on: 80–450 V at 15 A, up to 4,000 W. MC4 panel leads plug straight in. With the Low-PV input, 5,600 W of solar in all.
- 8Power In/Out · 30 AIn · OutEcoFlow’s Power In/Out port: 120 V or 240 V at 30 A. EcoFlow’s manual lists it for charging from a generator or an EV charger.
- 9Battery portIn · OutConnects the inverter to its battery (cable shown plugged in). One inverter takes up to five batteries, 30 kWh by EcoFlow’s store page.
Beside the AC inlet: a ground screw and the AC charging-speed switch. The DC output, the solar inputs and the AC inlet sit behind covers that are shown open.
Photo: EcoFlow · Product image, EcoFlow US store · numbers and labels are ours. Port names from EcoFlow’s manual; ratings from EcoFlow’s US spec table and manual; cover printing read from EcoFlow’s store picture.
Strengths & trade-offs
EcoFlow DELTA 3800 Gen4
Strengths
- +Costs $2,000 less
- +Lighter by 114.3 lb
- +Rated for 6,000 charge cycles — much longer battery lifespan
Trade-offs
- –Weaker inverter (-3,600W) limits appliance compatibility.
EcoFlow DELTA Pro Ultra
Strengths
- +Larger battery capacity
- +Higher AC output
- +Faster solar charging
Trade-offs
- –Substantially more expensive (+$2,000) than the DELTA 3800 Gen4.
- –Significantly heavier (+114.3 lbs), making it harder to move.
- –Very heavy unit that may be difficult for one person to lift.
- –Shorter-lived battery — rated for 3,500 charge cycles vs the DELTA 3800 Gen4's 6,000, 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 3800 Gen4
The DELTA Pro Ultra at 181.8 lbs is not a take-along — it rolls off a truck bed if it travels at all, so this scenario belongs to the DELTA 3800 Gen4 by default — and it earns it, covering the 2,100Wh with 1,099Wh to spare. Capacity was never the DELTA Pro Ultra's problem here; getting to a campsite was.
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 Pro Ultra
Both finish. The Pro Ultra ends with 3,577 Wh, two more nights. The DELTA 4 (3800) ends with 1,554 Wh, 94% of another.
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 cover a CPAP night several times over, at 10% of the DELTA 4 (3800). Noise doesn't split them: EcoFlow's DELTA 4 figure is a ceiling under heavy load, and neither published number describes a CPAP's small draw. Pick on everything else.
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
DELTA Pro Ultra
The DELTA Pro Ultra clears the workday at 17% used, banking 4,312Wh — late work, extra calls, or a second laptop charge without arithmetic. The DELTA 3800 Gen4 at 28% also finishes, with 2,289Wh of slack for the unplanned.
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 3800 Gen4
The DELTA 4 (3800) covers the 670 Wh with 2,529 Wh left. The Pro Ultra would need a truck and two friends.
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
DELTA Pro Ultra
The DELTA 4 (3800) runs 1,486 Wh short on its own battery, though it takes extra ones. The Pro Ultra covers the 4,685 Wh with 537 Wh left.
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 Pro Ultra runs 25.5h vs 15.6h.
$4,199 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 0–348.2hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–69.6hHigh-Draw Appliances
These reveal the real limitsscale 0–5.2h¹ 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 3800 Gen4
If everything in the house plugs into an ordinary outlet, I'd buy the DELTA 4 (3800) and add a battery when I need one. It holds 3,763 Wh at 67.5 lb, takes up to two extra batteriesA6, is rated for 6,000 cycles against 3,500, and costs less per watt-hour at $2,199 against $4,199. The Pro Ultra is the buy when a 240 V load, a draw past 3,600 W or a no-break switchover is the point, because no battery gives the DELTA 4 (3800) any of those. If you need power before the DELTA 4 (3800) ships in late NovemberA10, the Pro Ultra is the one already in owners' handsB4.
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.
$2,199.00 · direct from EcoFlow
or check the DELTA Pro Ultra price$4,199.00 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): UPS, RV Living, Solar Generator, Tailgating, 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 3800 Gen4 rates 4.1/5 (48th percentile of 22 Home Backup-class units), and DELTA Pro Ultra rates 4.9/5 (95th 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.
114.3 lb Apart
The DELTA 4 (3800) is 67.5 lb, a two-handle lift for short distances. The Pro Ultra is 181.8 lb across its boxes and gets set up once. Extra batteries add boxes to the DELTA 4 (3800) too, but the main unit still travels alone.
Batteries Don't Add Surge
The Pro Ultra surges to 10,800 W against 7,200 W. An extra battery gives the DELTA 4 (3800) more hours and the same startup ceiling, so a motor that won't start today won't start after you expand.
UPS Switchover: 0ms-rated vs ≤10ms
Both list a UPS mode, at different rated speeds. The DELTA Pro Ultra is rated 0ms — a no-break design on paper, which is the maker's classification rather than a stopwatch result. The DELTA 3800 Gen4 is rated ≤10ms — quick enough on paper that desktop PCs and routers should ride through, treating that as the rating it is. 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. The DELTA 3800 Gen4's figure is a maximum rather than a guarantee — it depends on registering the unit in the EcoFlow app, which adds two years to a three-year standard term. Worth saying because the per-dollar framing can suggest otherwise: the DELTA 3800 Gen4 works out at 2.3 years of cover per $1,000 spent against the DELTA Pro Ultra's 1.2, but that spread is the price gap, not the terms.
Battery Lifespan in Real Years
The DELTA 3800 Gen4 is rated for 6,000 cycles vs 3,500. In real life: at daily use, that's 16.4 vs 9.6 years. At weekend use (twice a week), it's 58 vs 34 years. One caution reading years across different sizes: a cycle is 3,763Wh on the DELTA 3800 Gen4 and 6,144Wh on the DELTA Pro Ultra, so count lifetime energy — roughly 22,578 kWh against 21,504 kWh over the rated life. After hitting the cycle limit, the battery doesn't die — it drops to ~80% of original capacity, which is still very usable.
Full record above — the Test Desk pick is the DELTA 3800 Gen4.
Check DELTA 3800 Gen4 price →or check the DELTA Pro Ultra 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 3800 Gen4 wins on both sticker price and long-term value. At $0.10/kWh over its lifetime, it's meaningfully cheaper to own. Clear value winner.
Delivers each lifetime kWh for $0.10 less — check the DELTA 3800 Gen4 price →
Growth path
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.
DELTA Pro Ultra
EXPANDABLESupports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 6,144Wh.
Accepts up to 5,600W 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.
Realistic full solar rechargeat 70% of rated panel output — see methodology
Analyst note
Both expand, but the DELTA Pro Ultra's higher solar ceiling (5,600W vs 2,000W) 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 3800 Gen4
Nobody has a DELTA 4 (3800) to report on yet. EcoFlow put it on sale in the US on November 4 and says it ships in late NovemberA10. What's here comes from EcoFlow's US spec table and FAQA1A4A6.
I'd want to test its 1,800 W wall charging on a real garage circuit. By EcoFlow's figure that's 15 A at 120 V, the full rating of an ordinary 15 A circuitA4. If I had one here, I'd plug it in beside a running chest freezer and see whether the breaker holds, or whether I end up turning the charge rate down in the app.
“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
EcoFlow DELTA Pro Ultra
The Pro Ultra's field record is one retailer's owners. Home Depot reviews call it a powerful, easy whole-home backup with quick setup and good app monitoringB4. Everything else we hold comes from EcoFlow or from reviewers repeating itB1B2.
EcoFlow's cell claim is the one this page leans on. It rates them for more than 3,500 cycles to 80%, which it calls 10+ years of useB2. That's the rating the DELTA 4 (3800)'s 6,000 cycles is up against.
“6,144Wh per battery with 7,200W continuous output (10.8kW surge), expandable to 90kWh across a system for a household — over 30 days of essential backup.”
Sources
ecoflow.com · homedepot.com · autoboosting.com · ecogadgethub.com
Sources & Research Notes
Every owner claim in this report is traceable to a published source. The bracketed references above resolve here.
Recurring owner themes
- Launch-day ledger: every entry is EcoFlow's own US store and documentation, or our labelled arithmetic. No owner or reviewer evidence exists yet. [DELTA 3800 Gen4 · 12 entries]
- Whole-home scale (to 90kWh), 7,200W output, online UPS, silent operation under load, and industry-fast charging are the standout features. [DELTA Pro Ultra · 2 entries]
- A1
“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]
- A2
“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]
- A4
“AC input 100–120 V, 15 A, 50/60 Hz; X-Stream charging up to 1,800 W from a US wall outlet. Our arithmetic: 1,800 W at 120 V is 15 A, the full rating of an ordinary 15 A circuit, so on a shared circuit you would set the charge rate lower in the EcoFlow app.”
EcoFlow US store, us.ecoflow.com/products/delta-3800-gen4 (spec table, features and FAQ, read 2026-11-04) · 2026-11-04 · [mixed]
- A6
“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]
- A7
“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]
- A10
“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]
- B1
“6,144Wh per battery with 7,200W continuous output (10.8kW surge), expandable to 90kWh across a system for a household — over 30 days of essential backup.”
ecoflow.com / homedepot.com — DELTA Pro Ultra · 2026 · [positive]
- B2
“LFP chemistry rated for over 3,500 cycles to 80% (10+ years of use).”
ecoflow.com / autoboosting.com — DELTA Pro Ultra review · 2026 · [positive]
- B4
“Owners call it a powerful, easy-to-use whole-home backup with quick setup, strong solar input, and good app monitoring; its 7,200W inverter can power a 3-ton central AC.”
homedepot.com owner reviews — DELTA Pro Ultra · 2026 · [positive]
Research compiled November 4, 2026.
Who Should Buy Which
Buy the DELTA 3800 Gen4 if you…
- →Storage is your worry, not wattage. Start at 3,763 Wh and add up to two EcoFlow batteriesA6.
- →You'll cycle it daily. 6,000 rated cycles against 3,500.
- →It has to go places sometimes. 67.5 lb against 181.8 lb.
- →Everything you'd back up plugs into an ordinary outlet. A fridge, a furnace blower, the router and the lights fit inside 3,600 W.
Buy the DELTA Pro Ultra if you…
- →The house has a 240 V load, like central air, a well pump or a dryer.
- →You're planning a roof array. It takes up to 5,600 W of solar.
- →Something on it can't blink. EcoFlow classes its switchover as no-break.
- →You can't wait for late November. That's when EcoFlow says the DELTA 4 (3800) shipsA10.
If neither fits
If you need 240 V and want to carry it, neither fits. The DELTA 4 (3800) has no 240 V outlet, and the Pro Ultra weighs 181.8 lb. Look at portable units that list a 240 V outlet instead.
The Bottom Line
If your loads plug into ordinary outlets, I'd buy the DELTA 4 (3800) and grow it. One extra battery takes it just short of the Pro Ultra's base, its cells are rated for more cycles, and the main unit still comes to the cabin.
If the house needs 240 V or more than 3,600 W, buy the Pro Ultra. Batteries add hours, and only the Pro Ultra adds the inverter.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Can the DELTA 4 (3800) hold as much as the DELTA Pro Ultra?
Nearly, with an extra battery. EcoFlow's kit with one DELTA 3 Max Plus battery comes to 6 kWh in all, just short of the Pro Ultra's 6,144 Wh. EcoFlow quotes 4 to 12 kWh of expandable capacity with up to two batteries.
Can the DELTA 4 (3800) run central air?
Not a unit that runs on 240 V. The DELTA 4 (3800) has no 240 V outlet and runs 3,600 W. The DELTA Pro Ultra has a 240 V outlet and 7,200 W.
How much is the DELTA 4 (3800) in the US?
EcoFlow lists it at $2,199 on its US store, and it ships in late November. The DELTA Pro Ultra sells for $4,199. Per watt-hour of battery, the DELTA 4 (3800) costs less.
Does the DELTA 4 (3800) battery last longer than the Pro Ultra's?
On paper, yes. EcoFlow rates the DELTA 4 (3800) for 6,000 cycles and the DELTA Pro Ultra for 3,500. Each Pro Ultra cycle is bigger, so rated lifetime energy is close: 22,578 kWh against 21,504 kWh.
Which one is easier to move?
The DELTA 4 (3800), at 67.5 lb with a handle at each end. The DELTA Pro Ultra weighs 181.8 lb across its boxes and is meant to be installed in one place.
Where to buy
EcoFlow DELTA 3800 Gen4Pick
$2,199.00
$2,199.00 · direct from EcoFlow
EcoFlow DELTA Pro Ultra
$4,199.00
$4,199.00 · direct from EcoFlow
Last checked 31 days ago. Prices move — check before you buy.
Prices may vary by retailer and are subject to change.