Head-to-head test
EcoFlow DELTA 3800 Gen4 vs EcoFlow DELTA Pro 346 lb Lighter, and It Takes the DELTA Pro 3's Battery. Why the Pro?
EcoFlow DELTA 3800 Gen4 vs EcoFlow DELTA Pro 3: 333 Wh less battery, 46 lb less weight, and it takes the Pro 3's own extra battery. Buy the DELTA 4 (3800) if everything you back up runs on 120 V. Pick the DELTA Pro 3 only for 240 V outlets or a battery bank bigger than the DELTA 4 can grow to.
Black Friday · 23 days out
Price to beat:DELTA Pro 3 $2,399
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 3 →
Written by Gunner GustafsonUpdated
Whole-Home Backup Tester, Station Arena Test Desk
Spec deltas
Gunner’s take
Whole-Home Backup Tester
The DELTA 4 (3800) is most of a DELTA Pro 3 with 46 lb taken out.
It holds 3,763 Wh against 4,096 Wh, 92% of the Pro 3's battery, and weighs 67.5 lb against 113.5 lb. One adult can get it into a hatchback. The Pro 3 needs a second person.
What the Pro 3 keeps for its extra weight is 240 V.
It has two 240 V outlets and runs 4,000 W against 3,600 W. The DELTA 4 (3800) runs everything from ordinary 120 V outlets, and its rated surge is the higher one, 7,200 W against 6,000 W.
The two share an extra battery, and that changes the math.
The DELTA 4 (3800) takes the DELTA Pro 3's own extra battery or a DELTA 3 Max Plus one, two at most through EcoFlow's adapterA6. EcoFlow lists it at $2,199 against $2,799 for the Pro 3, and it ships in late NovemberA10.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
Up to EcoFlow's 12 kWh for the smaller baseA6, a bigger base buys you nothing an extra battery doesn't. The battery also comes in a second box, so nothing in the bank weighs more than the 67.5 lb base. The Pro 3 only pulls ahead when the bank has to go past that, toward the 48 kWh reviewers note it reachesB1.
DELTA 4 (3800) takes up to two extra batteries: the DELTA Pro 3's or the DELTA 3 Max Plus (2,048 Wh)A6EcoFlow's kit of the DELTA 4 (3800) with a DELTA 3 Max Plus battery, 6 kWh in all, lists at $2,999A10DELTA Pro 3 alone: 4,096 Wh
Why it mattersIf your plan tops out under 12 kWhA6, put the money into an extra battery, not into the bigger base.
rated cycles
A fridge, a furnace blower, a sump pump and the router all fit inside 3,600 W at 120 V, and the DELTA 4 (3800) is rated to start a motor harder. The loads it can't run are on two-pole breakers: a deep well pump, an electric dryer, a mini-split on its own circuit. No battery you add changes that.
DELTA Pro 3: 4,000 W continuous, 6,000 W rated surge, two 240 V outletsDELTA 4 (3800): 3,600 W continuous, 7,200 W rated surge, all outlets at 120 VA2A3Both take the DELTA Pro 3 extra batteryA6
Why it mattersWrite down your 240 V loads. If the list is empty, the Pro 3's best feature is one you'd never use.
solar input
In a long outage the wall isn't there, so solar is the input that counts, and the Pro 3 takes 600 W more of it. Open-circuit voltage, printed on a panel's back as Voc, is what each DELTA 4 input checks against its 60 V limit, so most folding panels fit in pairsA5.
DELTA 4 (3800): 2,000 W of solar over two 11 to 60 V inputs, 1,000 W eachA5DELTA Pro 3: 2,600 W of solar; up to 7,000 W combined input, 0 to 80% in about 50 minutesB3DELTA 4 (3800): up to 1,800 W from the wall, which is 15 A at 120 VA4
Why it mattersIf you'll live on a big array for days at a time, the Pro 3's extra solar input is worth weighing.
The specific dimensions that decide these two units — everything else is a tie.
Growth Path
Selected because: Both take extra batteries, and the DELTA 4 (3800) takes the DELTA Pro 3's own.
solar input
The best thing about the DELTA 4 (3800) is that it borrows the Pro 3's battery. EcoFlow lists the DELTA Pro 3 extra battery and the DELTA 3 Max Plus one as the two it accepts, up to two at a time through an expansion adapterA6. A battery bought for one box isn't stranded if you later own the other.
Past 12 kWh, the Pro 3 is the only road. EcoFlow quotes 4 to 12 kWh for the DELTA 4 (3800)A6. Reviewers note the Pro 3 goes to 48 kWhB1, a bank built to sit behind a home panel. A fridge, a furnace and the router never get near either ceiling.
Portability & Form Factor
Selected because: 3,763 Wh at 67.5 lb against 4,096 Wh at 113.5 lb: 46 lb apart for 333 Wh.
weight
I'd carry the DELTA 4 (3800) down basement stairs by myself, and not the Pro 3. At 67.5 lb it's a one-person lift with bent knees, with a handle at each end and a folding cart EcoFlow sells separatelyA7. The Pro 3 is a two-person job every time it moves.
A box that never moves pays for its weight once. If the Pro 3 goes beside the panel in the garage and stays, the 46 lb matters on install day only. The DELTA 4 (3800) measures 16.77 by 11.36 by 12.09 inches without its handlesA7, small enough for a closet shelf.
What the Specs Don't Tell You
Selected because: The DELTA 4 (3800) is rated to surge to 7,200 W against 6,000 W. Both switch over in no worse than 10 ms.
rated cycles
For a 120 V motor, the smaller box is rated to start harder. It surges to 7,200 W against 6,000 W, so a fridge compressor or a sump pump that starts on the Pro 3 should start here too. The Pro 3 holds 400 W more once everything is running, room for a microwave on top.
Neither is a UPS for a computer that needs to shut itself down. Both are rated to switch over in no worse than 10 ms, which a router rides through. EcoFlow's FAQ says the DELTA 4 (3800) doesn't support HID communicationA8, the USB link a desktop uses to learn the power is out and shut down cleanly.
Your Life, Your Pick
Selected because: Both cover every day we model except Van Life Daily, and the lighter box takes camping and the tailgate.
Every ordinary day fits in either battery. The DELTA 4 (3800) finishes the eight-hour blackout with 1,554 Wh to spare and the Pro 3 with 1,837 Wh. A CPAP night uses about a tenth of either.
Van Life Daily is where the shared battery pays off. It needs 4,685 Wh, and neither covers it alone: the DELTA 4 (3800) is 1,486 Wh short, the Pro 3 1,203 Wh. One DELTA Pro 3 extra battery closes either gap, and both take itA6.
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 3
Front panel
- 12× USB-C · 100 WOutTwo USB-C ports, up to 100 W each and 200 W together.
- 22× USB-A · 18 WOutTwo fast-charge USB-A ports, up to 18 W each.
- 34× 20 A outletsOutFour NEMA 5-20 outlets, 120 V at 20 A, switched by the 120V ON/OFF button. The unit gives 4,000 W continuous and a 6,000 W surge.
- 4NEMA 6-20 · 240 VOutA 240 V outlet rated 16.7 A, switched by the 240V ON/OFF button.
- 5L14-30 · 120/240 VOutA twist-lock marked 120V and 240V, rated 16.7 A: the usual plug for a transfer switch or a generator inlet box.
The TT-30 RV outlet (120 V, 30 A), the Anderson port (30 A) and a DC5521 output (5 A) are listed in EcoFlow’s US specs but aren’t in this picture.
Photo: EcoFlow · Product image, EcoFlow US store · numbers and labels are ours. Port names printed on EcoFlow’s panel; outlet types and ratings from EcoFlow’s US store specs; output totals from our catalogue.
Rear panel
- 1Charge-speed switchInSwitches the AC charging speed.
- 22× Solar in · 2,600 WInSOLAR INPUT is the high-voltage port: 30–150 V, 15 A, 1,600 W. SOLAR/CAR INPUT is the low-voltage port: 11–60 V, 20 A, 1,000 W, and also takes a car cable (12 V at 8 A or 48 V at 20 A).
- 3AC power in/outIn · OutCharges from the wall at 100–240 V, 15 A. EcoFlow says this port also connects the Smart Home Panel 2 or the 50 Amp Hub.
- 4Battery portIn · OutOne of two battery ports. Two DELTA Pro 3 extra batteries take one unit to 12 kWh, by EcoFlow’s figure.
- 5Battery portIn · OutThe second battery port.
Shown with the covers closed; each marker points to the cover over the port.
Photo: EcoFlow · Product image, EcoFlow US store · numbers and labels are ours. Port names printed on EcoFlow’s covers; ratings from EcoFlow’s US store specs and FAQ.
Strengths & trade-offs
EcoFlow DELTA 3800 Gen4
Strengths
- +Costs $600 less
- +Lighter by 46 lb
- +Rated for 6,000 charge cycles — much longer battery lifespan
Trade-offs
- –No major technical downsides compared to rival.
EcoFlow DELTA Pro 3
Strengths
- +Larger battery capacity
- +Higher AC output
- +Faster solar charging
Trade-offs
- –Significantly heavier (+46 lbs), making it harder to move.
- –Very heavy unit that may be difficult for one person to lift.
- –Shorter-lived battery — rated for 4,000 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
Both cover the 2,100 Wh. The DELTA 4 (3800) takes it because the Pro 3, at 113.5 lb, isn't coming to the campsite.
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
Either unit
Both finish the 1,645 Wh night, with 1,554 Wh and 1,837 Wh left, and both are rated to switch over in no worse than 10 ms. Call this one a draw.
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 run the 320 Wh night on about a tenth of the battery. Noise can't break the tie: EcoFlow rates the DELTA 4 as a ceiling at heavy load, and neither rating describes a CPAP's small draw. Choose on weight or price.
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 3800 Gen4 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 3800 Gen4
The DELTA Pro 3 at 113.5 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 670Wh with 2,529Wh to spare. Capacity was never the DELTA Pro 3'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 covers 4,685 Wh alone. The DELTA 4 (3800) is 1,486 Wh short and the Pro 3 1,203 Wh. Both take the same extra battery, so the fix is the same too.
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 3 runs 17h vs 15.6h.
$2,799 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 0–232.1hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–46.4hHigh-Draw Appliances
These reveal the real limitsscale 0–3.5h¹ 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
I'd buy the DELTA 4 (3800) unless something in your house runs on 240 V. It holds 3,763 Wh against 4,096 Wh, weighs 67.5 lb against 113.5 lb, has the higher rated surge, and takes the DELTA Pro 3's own extra batteryA6. It also costs $600 less. The DELTA Pro 3 answers with 400 W more continuous output, two 240 V outlets, 2,600 W of solar and a 48 kWh ceilingB1. If your plan needs 240 V, or a bank past the 12 kWh EcoFlow quotes for the DELTA 4 (3800)A6, the Pro 3 is the only one of the two that gets there.
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 3 price$2,799.00 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, 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 3 rates 3.9/5 (33rd 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.
Weight Reality Check
Neither unit is grab-and-go. The DELTA 3800 Gen4 (67.5 lbs) is manageable solo but heavier than a large checked suitcase. The DELTA Pro 3 (113.5 lbs) is firmly a two-person lift. It goes where you put it and stays there. That's a 46 lb difference, and it is paid once — getting the heavier one into position, not every time you move it.
Surge Power: Inverter Quality Indicator
The DELTA 3800 Gen4 has a 2× surge-to-continuous ratio vs the DELTA Pro 3's 1.5×, and the higher absolute ceiling with it — 7,200W against 6,000W. At 2× it clears the 2× rule of thumb for absorbing motor startups — fridges, AC compressors and power tools briefly draw 2-3× their rated wattage. What decides whether a given motor starts is the ceiling, not the ratio: the DELTA Pro 3 still surges to 6,000W, so check the startup draw of the heaviest thing you plan to run against that figure rather than assuming it trips.
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 3800 Gen4 works out at 2.3 years of cover per $1,000 spent against the DELTA Pro 3's 1.8, 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 4,000. In real life: at daily use, that's 16.4 vs 11 years. At weekend use (twice a week), it's 58 vs 38 years. 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 3 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.
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 3
EXPANDABLESupports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 4,096Wh.
Accepts up to 2,600W 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, 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 3800 Gen4
Nobody owns a DELTA 4 (3800) yet. EcoFlow put it on sale on November 4 and says it ships in late NovemberA10. I went through EcoFlow's US spec table and FAQ, and everything here comes from those plus our arithmeticA1A6.
What I'd test first is the battery the two share. I'd hang a DELTA Pro 3 extra battery off it, run the pair down, and refill them from one kitchen outlet. At the full 1,800 W that's 15 A, the whole rating of a 15 A circuitA4, so I'd expect to turn the rate down in the app and wait longer.
“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 3
The Pro 3's record comes from reviewers and retailers, not long-term owners. Our research drew on review sites and retailer listingsB0. Reviewers call it a gold-standard whole-home backupB4, and the praise centres on the multi-charge speed, 0 to 80% in about 50 minutes with every input in useB3.
The consistent knock is the one on the spec sheet. It weighs about 113.5 lbB4, and the pattern in our research is a big battery and very fast charging, paid for in heftB1B3. Its pack is rated for 4,000-plus cycles to 80%B2.
“4,096Wh LFP battery with 4,000W continuous AC output (6,000W with X-Boost) and dual-voltage 120V/240V, expandable to 48kWh.”
Sources
ecoflow.com · amazon.com · homedepot.com · thepowerpick.com · outboundpower.com · techradar.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
- 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]
- Huge 4,096Wh LFP capacity, 4,000W dual-voltage output, very fast charging, and big expandability are the standout praise; it's heavy at ~113 lbs. [DELTA Pro 3 · 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]
- A3
“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]
- 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]
- A5
“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]
- 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]
- A8
“Switches to backup within 10 ms when the grid drops; EcoFlow's FAQ says it does not support HID communication. Noise by EcoFlow's figures: 40 dB or less at up to 1,800 W, 50 dB or less at the full 3,600 W. IP20.”
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
“4,096Wh LFP battery with 4,000W continuous AC output (6,000W with X-Boost) and dual-voltage 120V/240V, expandable to 48kWh.”
ecoflow.com / amazon.com — DELTA Pro 3 · 2026 · [positive]
- B2
“LiFePO4 rated for 4,000+ cycles to 80% (10+ years), with an IP65 battery rating.”
homedepot.com / thepowerpick.com — DELTA Pro 3 review · 2026 · [positive]
- B3
“Multi-charge technology reaches 0-80% in about 50 minutes using up to 7,000W input, with a full charge in roughly 90 minutes; up to 2,600W solar.”
outboundpower.com / techradar.com — DELTA Pro 3 review · 2026 · [positive]
- B4
“Weighs about 113.5 lbs; reviewers call it a gold-standard whole-home backup unit for 2026.”
techradar.com / thesolarlab.com — DELTA Pro 3 review · 2026 · [positive]
Research compiled November 4, 2026.
Who Should Buy Which
Buy the DELTA 3800 Gen4 if you…
- →It will move. 67.5 lb against 113.5, for 333 Wh less battery.
- →Your backup list is all 120 V: a fridge, a furnace blower, a sump pump and the router.
- →You'll grow, but not past 12 kWh. It takes the DELTA Pro 3's own extra batteryA6.
- →Motors worry you more than voltage. Its rated surge is 7,200 W against 6,000 W.
Buy the DELTA Pro 3 if you…
- →Something runs on 240 V, like a deep well pump or an electric dryer.
- →You're planning a whole-house bank. Reviewers note it expands to 48 kWhB1.
- →You'll recharge from a big array. 2,600 W of solar against 2,000 W.
- →You want the most battery in one base. 4,096 Wh against 3,763 Wh.
If neither fits
If you're keeping a fridge and a router alive for one night, both are oversized. The eight-hour blackout uses about half of either, so a 2,000 Wh-class station costs less and lifts easier.
The Bottom Line
If your house runs on 120 V and your bank stays under 12 kWhA6, I'd buy the DELTA 4 (3800). It carries 92% of the Pro 3's battery at 59% of the weight, and it takes the same extra battery when you want more.
If you need 240 V or a bank past 12 kWhA6, buy the DELTA Pro 3. It's the bigger machine, and no battery you add gives the DELTA 4 a 240 V outlet.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Can the EcoFlow DELTA 4 (3800) use the DELTA Pro 3 extra battery?
Yes. EcoFlow lists the DELTA Pro 3 extra battery and the DELTA 3 Max Plus extra battery as the two it accepts, up to two at a time through EcoFlow's expansion adapter. EcoFlow quotes 4 to 12 kWh in all.
Does the DELTA 4 (3800) have 240 V outlets like the DELTA Pro 3?
No. Its outlets are all 120 V, and it runs 3,600 W continuously. The DELTA Pro 3 has two 240 V outlets and runs 4,000 W.
How much is the DELTA 4 (3800), and when does it ship?
EcoFlow lists it at $2,199 on its US store, and it ships in late November. The DELTA Pro 3 sells for $2,799.
Which is lighter, the DELTA 4 (3800) or the DELTA Pro 3?
The DELTA 4 (3800), at 67.5 lb against 113.5 lb. It holds 3,763 Wh to the Pro 3's 4,096 Wh.
Which battery lasts longer?
EcoFlow rates the DELTA 4 (3800) for 6,000 cycles and the DELTA Pro 3 for 4,000. Cycled every day, that's 16.4 years against 11 by our engine's count.
Where to buy
EcoFlow DELTA 3800 Gen4Pick
$2,199.00
$2,199.00 · direct from EcoFlow
EcoFlow DELTA Pro 3
$2,799.00
$2,799.00 · direct from EcoFlow
Last checked 31 days ago. Prices move — check before you buy.
Prices may vary by retailer and are subject to change.