Head-to-head test
EcoFlow DELTA 3 vs EcoFlow DELTA 3800 Gen4Four Times the Solar Input, and Both Grow. Start Big or Small?
EcoFlow DELTA 3 vs EcoFlow DELTA 3800 Gen4: both take extra batteries, but the DELTA 3 refills through 500 W of solar and the DELTA 4 (3800) through 2,000 W, starting at 3,763 Wh against 1,024 Wh. Buy the DELTA 4 (3800) if panels are your plan or outages run long. Pick the DELTA 3 if one small battery covers your nights and it rides in your car.
Black Friday · 23 days out
Price to beat:DELTA 3 $519
The lowest we have recorded. A Black Friday price above it is a sale this unit has already had.
Full profiles: EcoFlow DELTA 3 → · 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
Both of these take extra batteries, so starting small doesn't lock you out of anything.
The DELTA 3 holds 1,024 Wh and grows from there. The DELTA 4 (3800) starts at 3,763 Wh, and EcoFlow quotes 4 to 12 kWh once you add up to two extra batteriesB6. The part that never grows is how fast the sun can refill either one.
You can add batteries later. You can't add solar inputs.
The DELTA 3 takes up to 500 W from panels. The DELTA 4 (3800) takes 1,000 W on each of two separate inputsB5. At full rated input each fills its own battery in about 2 hours, so the DELTA 4 (3800) puts back more than three and a half times the energy in the same afternoon.
It lists at $2,199, against $629 for the DELTA 3.
Per watt-hour that makes the DELTA 4 (3800) a touch cheaper, and EcoFlow says it ships in late NovemberB10. The DELTA 3 is on sale now, which matters if the outage you're worried about is next week.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
A DELTA 3 grown into a big bank is a big tank on a garden hose. After three grey days, 500 W is what refills it, whatever size it has become. The DELTA 4 (3800) takes two separate sets of panels, and short winter days are exactly when that second input pays.
DELTA 3: 1,024 Wh, 500 W solar input, takes EcoFlow extra batteriesDELTA 4 (3800): two solar inputs at 1,000 W eachB5DELTA 4 (3800): 4 to 12 kWh with up to two extra batteries, by EcoFlow's figureB6
Why it mattersIf panels are your recharge plan, the input settles this before the battery does.
weight
At 67.5 lb it's a lift you plan, with bent knees and someone holding the door. The DELTA 3 is a box you grab on the way out. For a tailgate or a CPAP night the small box finishes the job, and the big one is a lot of battery riding along for nothing.
DELTA 3: 27 lb, with a car socketDELTA 4 (3800): 67.5 lb, a handle at each end, cart sold separatelyB7CPAP Overnight and Tailgate Party: both units finish
Why it mattersIf it travels more than it stays, start with the DELTA 3.
Add one extra battery and EcoFlow's 6 kWh kitB10 clears even the van-life day on paper, after our 15% allowance. The DELTA 3 would have to grow several times over to get there, and every watt-hour of it would come back through 500 W of solar.
8-Hour Blackout needs 1,645 Wh; the DELTA 3 has 870 Wh usableDELTA 4 (3800): 3,199 Wh usable, 1,554 Wh left after the nightVan Life Daily needs 4,685 Wh; the DELTA 4 (3800) alone is 1,486 Wh shortEcoFlow's kit with one extra battery: 6 kWh in allB10
Why it mattersIf your bad days run long or your rig lives off-grid, start at 3,763 Wh.
The specific dimensions that decide these two units — everything else is a tie.
Growth Path
Selected because: Both take extra batteries, but only one takes 2,000 W of solar to fill them.
solar input
The DELTA 3's battery port is a real alternative, right up until you count the panels. Start at 1,024 Wh, add batteries as the budget allows, and you never pay for a box you didn't need. The catch is that the intake stays at 500 W as the bank grows, so each battery you add is more to refill through the same port.
The DELTA 4 (3800) starts bigger and refills faster. It takes up to two of EcoFlow's DELTA Pro 3 or DELTA 3 Max Plus extra batteries through an adapterB6. Each of its two solar inputs accepts 11 to 60 VB5, measured as open-circuit voltage, the panel's no-load figure printed on its back as Voc. That's a wide window, so a second set of panels goes on without rewiring the first.
Your Life, Your Pick
Selected because: The DELTA 3 runs 775 Wh short of an eight-hour blackout, and the DELTA 4 (3800) finishes with 1,554 Wh left.
The DELTA 4 (3800) finishes our blackout night with more than a whole DELTA 3's worth left over. The night needs 1,645 Wh and it ends with 1,554 Wh in hand. The DELTA 3 alone runs 775 Wh short, so for outages it wants an extra battery from day one.
Small jobs are where the DELTA 3 earns its price. A CPAP night uses a bit over a third of it, and a tailgate leaves 200 Wh spare. The remote workday is the near miss at 40 Wh short, which one gadget fewer fixes. Van Life Daily beats both on their own batteries, and the DELTA 4 (3800) gets closer at 1,486 Wh short.
PowerScore Breakdown
Selected because: Twice the DELTA 3's inverter, continuous and surge, is most of why the bigger box scores higher.
overall power score
The bigger box also has twice the inverter, which matters more in a house than at a campsite. The DELTA 4 (3800) runs 3,600 W and surges to 7,200 W at 120 VB2. The DELTA 3 runs 1,800 W and surges to 3,600 W, so its peak is the big box's everyday rating. A space heater and a microwave at once is more than the DELTA 3 can carry, and well inside the DELTA 4 (3800).
The wall charge is sized to the circuit, not the box. EcoFlow rates it at 1,800 W from a US outlet, which is 15 A at 120 V, an ordinary circuit's whole ratingB4. On a garage circuit that also feeds a freezer, I'd turn the rate down in the app before the breaker does it for me.
Portability & Form Factor
Selected because: 27 lb against 67.5 lb: one travels, the other gets placed.
weight
The DELTA 3 is the one that leaves the house. At 27 lb it goes in the car without a plan, and its car socket runs a cooler on the drive. The DELTA 4 (3800) is 67.5 lb with a handle at each end and no car socketB3B7, a two-handed lift I'd plan before I made it.
Splitting the job is a fair answer. A DELTA 3 for the car plus an extra battery that stays home gives you a light box on Saturday and more battery when the power goes out. It doesn't give you the DELTA 4 (3800)'s solar intake, and that's the trade.
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
Front panel
- 12× USB-C · 100 WOutTwo USB-C ports, printed USB-C 100W: up to 100 W each by EcoFlow’s spec table. Ports for laptops.
- 22× USB-A · 18 WOutTwo USB-A ports printed FAST CHARGE, 18 W max by EcoFlow’s spec table.
- 36× AC outletsOutSix outlets, three two-prong and three T-slot, sharing 1,800 W and a 3,600 W surge. X-Boost runs devices up to 2,200 W.
Photo: EcoFlow · Product image, EcoFlow US store · numbers and labels are ours. Ratings printed on EcoFlow’s panel and listed in the spec table on EcoFlow’s US store page.
Rear panel
- 1Solar/car in · 500 WInPrinted SOLAR/CAR INPUT. An XT60 input, 11 to 60 V, up to 500 W of solar.
- 2Battery portIn · OutPrinted EXTRA BATTERY PORT. Takes one DELTA 3, DELTA 2, DELTA 2 Max or DELTA Pro 3 extra battery, up to 5 kWh in all by EcoFlow’s figure.
- 3AC in · 1,500 WInPrinted AC CHARGE. Charges at up to 1,500 W.
- 412 V car socket · 126 WOutA capped car socket, 12.6 V at 10 A, 126 W max.
- 52× DC5521 · 3 AOutTwo DC5521 barrel outputs, 12.6 V at 3 A max; 3A MAX is printed between them.
The three inputs sit behind the flap, shown closed. The DC ON/OFF button switches the car socket and the barrel ports.
Photo: EcoFlow · Product image, EcoFlow US store · numbers and labels are ours. Port names printed on EcoFlow’s panel; ratings and battery list from the spec table on EcoFlow’s US store page; the connector type from our catalogue.
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
Strengths
- +Costs $1,570 less
- +Lighter by 40.5 lb
Trade-offs
- –Weaker inverter (-1,800W) limits appliance compatibility.
- –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
- +Larger battery capacity
- +Higher AC output
- +Faster solar charging
- +Rated for 6,000 charge cycles — much longer battery lifespan
Trade-offs
- –Substantially more expensive (+$1,570) than the DELTA 3.
- –Significantly heavier (+40.5 lbs), making it harder to move.
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 3 runs 1,230 Wh short of the 2,100 Wh weekend. The DELTA 4 (3800) covers it with 1,099 Wh left, if you can get 67.5 lb 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
DELTA 3800 Gen4
The DELTA 3 doesn't finish — 870Wh usable against the 1,645Wh this needs leaves it 775Wh short, about 53% of the scenario covered. The DELTA 3800 Gen4 covers it with 1,554Wh to spare.
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 the night at least twice over, so capacity doesn't split them. The DELTA 3 is the one you'd rather carry to the bedside, at 27 lb against 67.5 lb.
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 3800 Gen4
The DELTA 3 comes up just short — it needs 910Wh and has 870Wh usable, a 40Wh gap (its nameplate 1,024Wh actually clears this — the flat 15% conversion allowance is what tips it under). Trim that much — one small appliance's worth across the day — and it finishes. The DELTA 3800 Gen4 covers it outright with 2,289Wh to spare.
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
Both handle game day; the DELTA 3800 Gen4 keeps more in reserve (21% used vs 77%). Tailgating is a light load, though, so the number you'll feel is weight: 27 lbs for the DELTA 3 against 67.5 lbs for the DELTA 3800 Gen4, from the trunk to the setup spot.
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 on its own battery. The DELTA 4 (3800) comes closer, 1,486 Wh short, and both take extra batteries, so this is a job for one.
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 4.2h.
$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 DELTA 3800 Gen4, on Power Score margin
If solar is how you'll refill, I'd buy the DELTA 4 (3800). Both units take extra batteries, so the DELTA 3's growth path is no edge on this page. What doesn't grow is the intake: the DELTA 3 takes 500 W of solar however big its bank gets, and the DELTA 4 (3800) takes 1,000 W on each of two inputsB5. It also has twice the DELTA 3's inverter and finishes our blackout night with 1,554 Wh left. The DELTA 3 is the right buy at $629 if one small battery covers your nights or the box rides in your car, at 27 lb against 67.5 lb. The $1,570 gap and a late-November ship dateB10 keep this a lean rather than a lock.
Today the DELTA 3 is $579, $50 under its typical $629. The verdict weighs typical prices, not today's. Prices checked 11 hours ago.
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 3 price$579.00 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): CPAP, Camping.
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 rates 4.5/5 (73rd percentile of 27 Everyday-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.
A Lift You Plan
The DELTA 4 (3800) weighs 67.5 lb and the DELTA 3 weighs 27 lb. One goes in the car without a second thought. The other is a two-handed lift, so decide where it lives before it arrives.
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 works out at 7.9 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.
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. One caution reading years across different sizes: a cycle is 3,763Wh on the DELTA 3800 Gen4 and 1,024Wh on the DELTA 3, so count lifetime energy — roughly 22,578 kWh against 4,096 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 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 3 is cheaper to buy, but the DELTA 3800 Gen4 is cheaper to own. At $0.10/kWh over its lifetime vs $0.15/kWh, the DELTA 3800 Gen4's higher cycle life and capacity make each dollar go further over the years.
Growth path
DELTA 3
EXPANDABLESupports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 1,024Wh.
Accepts up to 500W of solar. Suitable for a 1-2 panel setup.
Generous port selection supports complex multi-device setups.
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, but the DELTA 3800 Gen4's higher solar ceiling (2,000W vs 500W) gives it the stronger off-grid growth path — more panels can feed a bigger bank as it grows.
What Owners Report
Patterns from published owner reports and long-term reviews — every claim cited to its source below.
EcoFlow DELTA 3
The standard DELTA 3 has less field data than you'd expect. Our research found most published testing covers its Plus, Max and Ultra siblingsA0. What exists for this model is one hands-on review where the fans stayed off below 200 WA1. A switchover test that kept routers running was done on the DELTA 3 PlusA2, so I treat that as the family's behaviour, not a measurement of this box.
“At low loads (under 200W) the fans often stay completely off, making the Delta 3 effectively silent; under moderate load (500–800W) the fans are barely audible from three feet away.”
Sources
portablepowernerd.com · thesolarlab.com · outputreport.com
EcoFlow DELTA 3800 Gen4
Nobody has a DELTA 4 (3800) in their garage yet. EcoFlow opened US sales on November 4 and says it ships in late NovemberB10. What we know comes from EcoFlow's US spec sheet and our own sumsB0B1.
I'd want to hang two sets of panels on it on a short December day. One set facing southeast, one southwest, then see what the screen says at sundown. EcoFlow rates each input at 1,000 WB5. A winter afternoon is where that second input earns its keep or doesn't.
“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
- 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
“At low loads (under 200W) the fans often stay completely off, making the Delta 3 effectively silent; under moderate load (500–800W) the fans are barely audible from three feet away.”
portablepowernerd.com — EcoFlow Delta 3 Tested: 2026 Hands-On Review; thesolarlab.com · 2026 · [positive]
- A2
“UPS switchover works as advertised — a power cut results in a ~10ms handoff, fast enough that routers don't reset, fridges don't skip a compressor cycle, and CPAP machines don't interrupt therapy.”
outputreport.com / thesolarlab.com — DELTA 3 line UPS testing (observed on DELTA 3 Plus, which shares the 10ms UPS spec) · 2026 · [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]
- B4
“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]
- 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]
Research compiled November 4, 2026.
Who Should Buy Which
Buy the DELTA 3 if you…
- →Your nights are small. A CPAP night uses a bit over a third of its 1,024 Wh.
- →It rides in the car. 27 lb, with a car socket for a cooler.
- →You'd rather grow one battery at a time. It takes extra batteries as your list grows.
- →You need it before the bigger box ships. It's on sale now at $629, and EcoFlow says the DELTA 4 (3800) ships in late NovemberB10.
Buy the DELTA 3800 Gen4 if you…
- →Panels are your recharge plan. Two inputs take 1,000 W eachB5.
- →Your outages run long. It finishes our eight-hour night with 1,554 Wh left.
- →You'll grow well past a few kilowatt-hours. EcoFlow quotes 4 to 12 kWh with extra batteriesB6.
- →Your evenings stack big loads. 3,600 W continuous against the DELTA 3's 1,800 W.
If neither fits
If you need 240 V for a well pump or an electric dryer, skip both. Neither has a 240 V outlet, so look at a home backup system that puts out 240 V.
The Bottom Line
If panels will refill it, I'd buy the DELTA 4 (3800). Both grow, but only one grows with the solar to fill it, and it finishes the blackout night the DELTA 3 can't.
If your nights are small and the box travels, buy the DELTA 3 now and add a battery when you need one. It's 27 lb, it's on sale today, and it stays useful wherever your list goes.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
How much is the EcoFlow DELTA 4 (3800) in the US?
It lists at $2,199 at EcoFlow's US store, against $629 for the DELTA 3. EcoFlow says it ships in late November.
Can I add batteries to the DELTA 3 later?
Yes. The DELTA 3 takes EcoFlow extra batteries, so you can start at 1,024 Wh and add capacity. Its solar input stays at 500 W as you do.
Which one charges faster from solar?
The DELTA 4 (3800). It takes 1,000 W on each of two inputs, against 500 W on the DELTA 3. At full rated input each fills its own battery in about 2 hours, so the DELTA 4 (3800) puts back more than three and a half times the energy in the same time.
How big can the DELTA 4 (3800) get with extra batteries?
EcoFlow quotes 4 to 12 kWh with up to two extra batteries, from its DELTA Pro 3 or DELTA 3 Max Plus lines. EcoFlow also sells a kit with one DELTA 3 Max Plus battery that comes to 6 kWh in all.
Is the DELTA 4 (3800) worth the extra weight over the DELTA 3?
Only if it mostly stays put. It weighs 67.5 lb against 27 lb and holds 3,763 Wh against 1,024 Wh. For a box that rides in the car most weekends, the DELTA 3 is the easier one to live with.
Where to buy
EcoFlow DELTA 3
$579.00
$579.00 · direct from EcoFlow
down from $629 · 8% below usual
Last checked 11 hours ago. Prices move — check before you buy.
EcoFlow DELTA 3800 Gen4Pick
$2,199.00
$2,199.00 · direct from EcoFlow
Prices may vary by retailer and are subject to change.