Head-to-head test
EcoFlow DELTA 3 Classic vs EcoFlow DELTA 3800 Gen43.7 Classics of Battery, With Room for Two More. Need It?
The Classic stops at 1,024 Wh, while the DELTA 4 (3800) starts at 3,763 Wh, refills from the sun just as fast and takes extra batteries. I'd buy the DELTA 4 (3800) if your outages run past one night, and the Classic if one night is all you plan for.
Black Friday · 23 days out
Price to beat:DELTA 3 Classic $449
The lowest we have recorded. A Black Friday price above it is a sale this unit has already had.
Full profiles: EcoFlow DELTA 3 Classic → · 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
The DELTA 4 (3800) refills from the sun as fast as the Classic does, with 3.7 times the battery.
It holds 3,763 Wh to the Classic's 1,024 Wh, and it takes up to 1,000 W on each of two solar inputsB5 against the Classic's 500 W on one. With both inputs maxed, a flat battery fills in no more time than the Classic needs at its limit.
The catch is the panels and the lift.
Filling it that fast takes four times the panel wattage the Classic can use, and the box weighs 67.5 lb against 26.7 lb. At $2,199 against $499, it also costs more per watt-hour on the shelf, so this is no bulk discount.
What the money buys is a system that keeps going.
The DELTA 4 (3800) takes up to two extra batteries through EcoFlow's expansion adapter, and EcoFlow quotes 4 to 12 kWh in allB6. The Classic is sealed at 1,024 Wh. EcoFlow put the DELTA 4 (3800) on sale on November 4 and says it ships in late NovemberB10, while the Classic is on sale now.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
solar input
In an outage that runs for days, the battery you can refill by evening matters as much as the one you started with. On a good day the DELTA 4 (3800) banks 3,763 Wh in the hours the Classic needs for 1,024. It only does that with 2,000 W of panels split across both inputs.
DELTA 3 Classic: 1,024 Wh, one 500 W solar inputDELTA 4 (3800): 3,763 Wh, two solar inputs at up to 1,000 W each, 2,000 W in all, 11 to 60 V per inputB5Two review outlets call the Classic's 500 W solar input its limitA5A9
Why it mattersIf you'd ride out a multi-day outage on solar, the DELTA 4 (3800) is the one that keeps up, and the panels belong in the budget.
The Classic has no such move. Its next step is a second station, and even two Classics land well short of a van-life day. The DELTA 4 (3800) turns a shortfall into a shopping list.
DELTA 3 Classic: sealed at 1,024 WhDELTA 4 (3800): up to two extra batteries, the 2,048 Wh DELTA 3 Max Plus battery or the DELTA Pro 3 battery; EcoFlow quotes 4 to 12 kWhB6Van Life Daily needs 4,685 Wh; the DELTA 4 (3800) alone is 1,486 Wh short
Why it mattersIf your needs might climb toward a van or more of the house, the DELTA 4 (3800) is the one that can follow them.
weight
So the extra battery pays only if you drain it. A CPAP night barely dents either one, and on that night the DELTA 4 (3800) is 40.8 lb of battery hauled to the bedroom for nothing.
Catalogue cost per watt-hour: lower for the DELTA 3 Classic than for the DELTA 4 (3800)Weight: 67.5 lb against 26.7 lbCPAP Overnight uses 37% of the Classic's usable battery and 10% of the DELTA 4 (3800)'s
Why it mattersIf one night is the longest you plan for, the Classic does it for less per watt-hour at well under half the weight.
The specific dimensions that decide these two units — everything else is a tie.
Growth Path
Selected because: The Classic stops at 1,024 Wh; the DELTA 4 (3800) takes EcoFlow's extra batteries.
solar input
The Classic is a finished system, and the DELTA 4 (3800) is the start of one. It takes up to two extra batteries through EcoFlow's expansion adapter: the DELTA 3 Max Plus battery at 2,048 Wh, or the DELTA Pro 3 batteryB6. EcoFlow quotes 4 to 12 kWh in allB6.
If you already own a DELTA 3 Max Plus extra battery, the sums change. It plugs into this box's battery portB6, so the first expansion costs nothing new. A Classic owner who outgrows 1,024 Wh is shopping for a second station.
Your Life, Your Pick
Selected because: The DELTA 4 (3800) finishes five of our six days on its own battery; the Classic finishes two.
The Classic's days end at bedtime. It covers a CPAP night and a tailgate, and comes up short on the workday, the blackout and the camping weekend. The DELTA 4 (3800) finishes all three with at least 1,099 Wh left each time.
Van Life Daily is where the battery port earns its keep. The DELTA 4 (3800) alone is 1,486 Wh short of the 4,685 Wh day, and one extra battery closes that on paperB6. The Classic has no way to get there.
What the Specs Don't Tell You
Selected because: 67.5 lb against 26.7 lb, and only one of the two can grow.
rated cycles
At 67.5 lb, the DELTA 4 (3800) moves like furniture. It has a handle at each end, and EcoFlow sells a folding cart for it separatelyB7. The Classic at 26.7 lb goes in the car with one hand on its centered handleA11.
The paperwork is a draw, and the battery rating isn't. Both carry three years plus two more when you register in the EcoFlow appB9, and the DELTA 4 (3800) is rated for twice the Classic's cycles. Each of its cycles is 3.7 times the energy, so that rating matters most to someone who'll charge it from the sun every day.
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 Classic
Front panel
- 1USB-C · 100 WOutPrinted USB-C 100W. Up to 100 W (20 V at 5 A) by EcoFlow’s spec table: the port for a laptop.
- 2USB-C · 30 WOutPrinted USB-C 30W. Up to 30 W by EcoFlow’s spec table: enough for a phone or tablet.
- 3USB-A · 18 WOutPrinted USB-A 18W. Up to 18 W (5, 9 or 12 V) by EcoFlow’s spec table.
- 43× AC outletsOutThree outlets, two T-slot and one two-prong, sharing 1,800 W and a 3,600 W surge. X-Boost runs heating-type devices up to 2,600 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; the surge figure from that page.
Rear panel
- 1Solar/DC in · 500 WInPrinted SOLAR/DC INPUT. An XT60 input taking up to 500 W of solar.
- 2AC in · 1,400 WInPrinted AC CHARGE. 100–120 V at 15 A, charging at up to 1,400 W.
The two inputs sit behind this flap, shown closed. No 12 V car socket and no extra-battery port: EcoFlow’s spec table lists neither.
Photo: EcoFlow · Product image, EcoFlow US store · numbers and labels are ours. Port names printed on EcoFlow’s flap; ratings 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 Classic
Strengths
- +Costs $1,700 less
- +Lighter by 40.8 lb
Trade-offs
- –Weaker inverter (-1,800W) limits appliance compatibility.
- –Sealed capacity — the DELTA 3800 Gen4 can add batteries to grow past 1,024Wh; this one can't.
- –Shorter-lived battery — rated for 3,000 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 (+$1,700) than the DELTA 3 Classic.
- –Significantly heavier (+40.8 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 Classic doesn't finish — 870Wh usable against the 2,100Wh this needs leaves it 1,230Wh short, about 41% of the scenario covered. The DELTA 3800 Gen4 covers it with 1,099Wh to spare.
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 Classic 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 with most of the battery left, so capacity doesn't decide it. The Classic is the one you can lift onto a nightstand with one hand.
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 Classic 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: 26.7 lbs for the DELTA 3 Classic 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 the 4,685 Wh day on its own battery. The DELTA 4 (3800) gets 68% of the way and takes extra batteries. The Classic gets 19% and can't grow.
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
For outages that run past one night, I'd buy the DELTA 4 (3800). It holds 3,763 Wh against 1,024 Wh, takes 2,000 W of solar across two inputsB5, and accepts up to two extra batteriesB6. It costs more per watt-hour on the shelf than the Classic, so you're paying for runtime, solar and room to grow, not a bulk discount. EcoFlow says it ships in late NovemberB10. If one night is your longest job, the call flips: the Classic does that night for $499 at well under half the weight.
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 Classic price$479.00 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 Classic rates 4.0/5 (42nd 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.
Two Hands and a Plan
The DELTA 4 (3800) is 67.5 lb against the Classic's 26.7 lb, 40.8 lb more for 2,739 Wh more battery. Pick the spot it lives in before you decide how often it moves.
The Classic Stops at 1,024 Wh
The Classic is sealed. The DELTA 4 (3800) starts at 3,763 Wh and takes EcoFlow's extra batteries, so it's the only one of the two that can grow into a van or a longer outage.
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 Classic works out at 10 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 3,000. In real life: at daily use, that's 16.4 vs 8.2 years. At weekend use (twice a week), it's 58 vs 29 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 Classic, so count lifetime energy — roughly 22,578 kWh against 3,072 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 Classic 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 Classic is cheaper to buy, but the DELTA 3800 Gen4 is cheaper to own. At $0.10/kWh over its lifetime vs $0.16/kWh, the DELTA 3800 Gen4's higher cycle life and capacity make each dollar go further over the years.
Growth path
DELTA 3 Classic
FIXED CAPACITYFixed at 1,024Wh, with no expansion — so size it for your needs up front rather than planning to add capacity later.
Accepts up to 500W of solar. Suitable for a 1-2 panel setup.
Adequate ports for most setups, but heavy users may want a power strip.
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
The DELTA 3 Classic is sealed at 1,024Wh, which is fine if that covers you. The DELTA 3800 Gen4 starts at 3,763Wh and can grow beyond it with EcoFlow expansion batteries — real headroom the DELTA 3 Classic doesn't have if your needs climb toward partial-home backup.
What Owners Report
Patterns from published owner reports and long-term reviews — every claim cited to its source below.
EcoFlow DELTA 3 Classic
Reviewers like the Classic's software and dislike its solar cap. One called the app one of the best-designed on the marketA6, and another found Storm Guard, which tops the battery up ahead of a forecast storm, genuinely usefulA12. Two outlets flag the 500 W solar input as the unit's real limitA5A9.
It starts more than its size suggests. One tester ran a small window AC from it and found the 1,800 W inverter handled the startup but the runtime ran shortA10. Treat all of it as an early snapshot: the Classic launched in March 2026, and long-term owner reports don't exist yetA0.
“In our tests, the DELTA 3 Classic charged from empty to full plugged into a standard wall outlet in just shy of 55 minutes.”
Sources
thesolarlab.com · vantour.net · smartenergyedge.com · walmart.com
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 NovemberB10, so this page leans on EcoFlow's US store page and our own catalogue figuresB0B5.
I'd want to hang a string of panels on each input and watch one sunny day. A string is just panels wired in series, and EcoFlow says each input takes 11 to 60 V and up to 1,000 WB5. If I had one, I'd check the screen at noon. Close to 2,000 W would make the quick refill real, and half that would send me looking for the reason.
“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
- Multiple independent reviewers note the unit is quieter than expected for its price point, with low idle drain. [DELTA 3 Classic · 2 entries]
- The 500W solar input cap is flagged as a limiting factor by more than one review outlet, seen as low for a 2026-era release. [DELTA 3 Classic · 2 entries]
- Reviewers praise the app and Storm Guard/smart features as standout software elements. [DELTA 3 Classic · 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]
- A5
“the screen only showed 500 W input”
vantour.net — EcoFlow Delta 3 Classic: Our review, test and promo code · 3 weeks ago (~June 2026) · [negative]
- A6
“it is clearly one of the best-designed apps on the market”
vantour.net — EcoFlow Delta 3 Classic: Our review, test and promo code · 3 weeks ago (~June 2026) · [positive]
- A9
“EcoFlow pushes the fast charging hard, but the DELTA 3 Classic is capped at 500W solar input”
smartenergyedge.com — EcoFlow DELTA 3 Classic Review: Better Than the DELTA 2? · 1 week ago (~July 2026) · [negative]
- A10
“The 1,800W inverter handles the startup surge of a small window AC unit just fine, but the runtime is short.”
smartenergyedge.com — EcoFlow DELTA 3 Classic Review: Better Than the DELTA 2? · 1 week ago (~July 2026) · [mixed]
- A11
“The handle is solid and centered well.”
smartenergyedge.com — EcoFlow DELTA 3 Classic Review: Better Than the DELTA 2? · 1 week ago (~July 2026) · [positive]
- A12
“The Storm Guard auto-charge feature is smart and genuinely useful.”
smartenergyedge.com — EcoFlow DELTA 3 Classic Review: Better Than the DELTA 2? · 1 week ago (~July 2026) · [positive]
- 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]
- 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]
- B9
“Rated for 6,000 cycles (EcoFlow: "15+ years"). Charges at 32–113°F (0–45°C), runs at 14–113°F (−10–45°C). Wi-Fi and Bluetooth with the EcoFlow app. Warranty: 3 years plus a 2-year extension when registered 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]
- 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 Classic if you…
- →One night is your longest job. A CPAP uses 37% of its usable battery.
- →You'll carry it. It's 26.7 lb against 67.5 lb.
- →You own one or two folding panels. Its 500 W input suits a modest setup, and the DELTA 4 (3800)'s fast solar refill needs 2,000 W of panels.
- →You need it now. It's on sale today at $499.
Buy the DELTA 3800 Gen4 if you…
- →Your outages last days, not hours. Its two solar inputs take 2,000 W between themB5, enough to refill it in about the time the Classic needs.
- →You'll grow. It takes up to two extra batteries, and EcoFlow quotes 4 to 12 kWh in allB6.
- →You already own a DELTA 3 Max Plus extra battery. It plugs into this one's battery portB6.
- →You can wait a few weeks. EcoFlow says it ships in late NovemberB10.
If neither fits
If anything in your house runs on 240 V, close this tab. Neither has a 240 V outlet, so a 240 V well pump or an electric dryer needs a station with split-phase output.
The Bottom Line
If your outages run past one night, I'd buy the DELTA 4 (3800). It refills 3,763 Wh in the sun the Classic needs for 1,024 WhB5, and it has a port for the batteries you'll want laterB6.
If one night is the longest you plan for, buy the Classic. It costs less per watt-hour, weighs well under half as much, and it's on sale now.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
How much is the EcoFlow DELTA 4 (3800) in the US?
EcoFlow lists it at $2,199 on its US store, where it went on sale on November 4, 2026. EcoFlow says it ships in late November. The DELTA 3 Classic is $499 and on sale now.
Can you add batteries to the DELTA 3 Classic?
No. The DELTA 3 Classic is fixed at 1,024 Wh. The DELTA 4 (3800) takes up to two extra batteries through EcoFlow's expansion adapter, and EcoFlow quotes 4 to 12 kWh in all.
How fast does the DELTA 4 (3800) charge from solar?
It takes up to 1,000 W on each of two inputs, 2,000 W in all. With enough panels on both, it fills its 3,763 Wh battery in a little less time than the DELTA 3 Classic fills 1,024 Wh at its 500 W limit.
How heavy is the DELTA 4 (3800)?
It weighs 67.5 lb, against 26.7 lb for the DELTA 3 Classic. It has a handle at each end, and EcoFlow sells a folding cart for it separately.
Does the DELTA 4 (3800) have a 240 V outlet?
No. The US unit puts out 120 V, rated 3,600 W continuous with a 7,200 W surge. Neither it nor the DELTA 3 Classic has 240 V, so a 240 V well pump or dryer needs a different station.
Where to buy
EcoFlow DELTA 3 Classic
$479.00
$479.00 · direct from EcoFlow
Last checked 31 days 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.