Head-to-head test
EcoFlow DELTA 3 Max Plus vs EcoFlow DELTA 3800 Gen4The Same Extra Battery Fits Both. So Which Box Do You Start With?
Both take the same EcoFlow extra battery, so the real question is where you start. For outage backup I'd start with the DELTA 4 (3800), unless you'll carry it often or would rather add batteries as you go.
Black Friday · 23 days out
Price to beat:DELTA 3 Max Plus $1,099
The lowest we have recorded. A Black Friday price above it is a sale this unit has already had.
Full profiles: EcoFlow DELTA 3 Max Plus → · EcoFlow DELTA 3800 Gen4 →
Written by Gunner GustafsonUpdated
Whole-Home Backup Tester, Station Arena Test Desk
Spec deltas
Gunner’s take
Whole-Home Backup Tester
These two share a battery, so the question is which box you start with.
EcoFlow's DELTA 3 Max Plus extra battery plugs into the Max PlusA4 and, through EcoFlow's expansion adapter, into the DELTA 4 (3800)B6. Buy either one and the battery you add later has two homes.
Out of the box, the DELTA 4 (3800) is the bigger start by 1,715 Wh.
It holds 3,763 Wh at 67.5 lb against 2,048 Wh at 50.7 lb. It runs 3,600 W against 3,000 W, and its two solar inputs take 2,000 W where the Max Plus takes 1,000 WB5.
The money is closer than the gap looks.
EcoFlow lists the DELTA 4 (3800) at $2,199 on its US storeB10, $1,000 more than the Max Plus at $1,199. Per watt-hour of battery, the two cost about the same.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
Capacity
The Max Plus finishes at 94% used, with 6% of a second night left. The DELTA 4 (3800) finishes at 51% with 94% of a second night in hand. Outages don't end on schedule, and the second evening is where the smaller battery has nothing left to give.
DELTA 4 (3800): 3,763 Wh; DELTA 3 Max Plus: 2,048 Wh8-Hour Blackout needs 1,645 WhLeft after the night: 1,554 Wh on the DELTA 4 (3800), 96 Wh on the Max Plus
Why it mattersIf your outages have ever run past one evening, start with the DELTA 4 (3800).
solar input
An extra battery fixes the Max Plus's capacity but not its solar port. A grown Max Plus is a bigger tank behind the same 1,000 W input, so every battery you add takes longer to refill from panels. The DELTA 4 (3800) grows from a 2,000 W base.
DELTA 4 (3800): two solar inputs, 11 to 60 V, 1,000 W each, 2,000 W totalB5DELTA 3 Max Plus: 1,000 W solar inputCapacities: 3,763 Wh against 2,048 Wh
Why it mattersIf panels are part of the plan, the DELTA 4 (3800) is the better base to build on.
So the start-small route wins on capacity whenever one extra battery costs less than the $1,000 gap. It doesn't buy the bigger inverter, the second solar input or a single box. It's two boxes and a cable, with the Max Plus's 1,000 W of solar feeding both.
DELTA 3 Max Plus: takes EcoFlow's extra batteries up to 10kWhA4DELTA 4 (3800): up to two extra batteries, the DELTA 3 Max Plus's 2,048 Wh one among them; EcoFlow quotes 4 to 12 kWhB6Price gap: $1,000
Why it mattersPrice one DELTA 3 Max Plus extra battery before you decide. If it comes in under the gap and you don't run panels, start small.
The specific dimensions that decide these two units — everything else is a tie.
Growth Path
Selected because: Both take the DELTA 3 Max Plus extra battery, so starting small is a real route.
solar input
The batteries are shared, which makes the small start honest. The Max Plus grows to 10kWh with EcoFlow's extra batteriesA4. The DELTA 4 (3800) takes up to two, either the DELTA 3 Max Plus extra battery or the DELTA Pro 3's, and EcoFlow quotes 4 to 12 kWh in allB6. EcoFlow even sells it in a kit with a Max Plus extra battery, 6 kWh in allB10.
A grown Max Plus still drinks through a 1,000 W straw. One extra battery puts it past the DELTA 4 (3800) on capacity. It adds no solar input, so every battery you hang off it takes longer to refill from panels. If the sun is your generator, the 2,000 W base is the better foundation.
Your Life, Your Pick
Selected because: The 8-Hour Blackout ends with 96 Wh on the Max Plus and 1,554 Wh on the DELTA 4 (3800).
The Max Plus finishes the blackout with almost nothing left. It ends the 1,645 Wh night at 94% used, 96 Wh in hand. The DELTA 4 (3800) ends at 51% with 1,554 Wh, nearly enough to do the whole night again.
Weekend Camping is the one the Max Plus misses outright. After the flat 85% we count as usable, it has 1,741 Wh against the 2,100 Wh the weekend needs and comes up 359 Wh short. The DELTA 4 (3800) covers it with 1,099 Wh spare. A CPAP night, a workday and a tailgate fit both with room left.
Portability & Form Factor
Selected because: 50.7 lb against 67.5 lb, and only the Max Plus has a 12 V car socket.
weight
The 16.8 lb gap decides where each box lives. The Max Plus is 50.7 lb, a box I'd carry across a campground. The DELTA 4 (3800) is 67.5 lb with a handle at each end, and EcoFlow sells a folding cart for it separatelyB7. I'd lift it into a truck bed alone, once, and set it down where it's staying.
Only the Max Plus has a 12 V car socket. Our record gives it one and the DELTA 4 (3800) noneB3. If you run a 12 V cooler at camp, that socket counts for more than the DELTA 4's extra AC outlet. The DELTA 4's five outlets include a 30 A twist-lock, the locking plug heavier cords useB3.
What the Specs Don't Tell You
Selected because: The DELTA 4 (3800) weighs 16.8 lb more and is rated for 6,000 cycles against 4,000.
rated cycles
Weight is the honest catch on my pick. 67.5 lb is heavier than a large checked suitcase, and the DELTA 4 (3800) has no wheels of its ownB7. If it lives beside the fridge, that costs you once. If it goes to the cabin every other weekend, it costs you every trip.
The cycle rating runs the other way. The DELTA 4 (3800) is rated for 6,000 cycles against the Max Plus's 4,000, about 22,578 kWh over its rated life against 8,192 kWh. Both carry three years plus two more when registered in EcoFlow's appB9, so the warranty doesn't split them.
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 Max Plus
Front panel
- 1USB-C · 140 WOutUp to 140 W, printed on the panel.
- 22× USB-C · 45 WOutPrinted 45W. EcoFlow’s US site lists the pair at 45 W in total.
- 3USB-A · 18 WOutUp to 18 W, printed on the panel.
- 44× 20 A outletsOutFour T-slot 120 V outlets in two pairs, AC1 and AC2, each pair with its own button. Together they give 3,000 W continuous and a 6,000 W surge.
The inputs, the battery port and the DC outputs are on the rear, mapped below.
Photo: EcoFlow · Product image, EcoFlow US store · numbers and labels are ours. Ratings printed on EcoFlow’s panel; outlet shapes read by us from EcoFlow’s picture; the shared USB-C figure from EcoFlow’s US site; output totals from our catalogue.
Rear panel
- 1AC in · 1,800 WInThe AC charging inlet. EcoFlow gives 1,800 W of wall charging.
- 2Charge-speed switchInSwitches AC charging between FAST and ADJUST, printed beside it.
- 32× Solar/DC inInTwo XT60 inputs, each printed 11–60 V, 18 A max. 1,000 W of solar in all.
- 4Battery portIn · OutTakes DELTA 3 Max Plus extra batteries, 2 to 10 kWh in all by EcoFlow’s figure. EcoFlow’s Smart Generator also connects here.
- 5Anderson portOutAn Anderson port for DC loads, listed on EcoFlow’s US site.
- 612 V car socketOutA 12 V car socket with its own on/off button, for a car fridge.
Photo: EcoFlow · Product image, EcoFlow US store · numbers and labels are ours. Port names and input ratings printed on EcoFlow’s panel; charging figures and the battery range from EcoFlow’s US site; solar total 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 Max Plus
Strengths
- +Costs $1,000 less
- +Lighter by 16.8 lb
Trade-offs
- –Weaker inverter (-600W) 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 (+$1,000) than the DELTA 3 Max Plus.
- –Significantly heavier (+16.8 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 4 (3800) takes this one with 1,099 Wh to spare. The Max Plus has 1,741 Wh usable against the 2,100 Wh needed and comes up 359 Wh short.
Battery budget usedlower = more headroom
LOAD Phone Charger 15W×6h · LED Lights 40W×8h · Box Fan 75W×14h · CPAP Machine 40W×16h
SCN-02 · 8 hours · needs 1,645Wh
8-Hour Blackout
Keep the essentials running through a night without power
DELTA 3800 Gen4
Both finish the night. The Max Plus ends with 96 Wh left. The DELTA 4 (3800) ends with 1,554 Wh, nearly a second night.
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. The published noise ratings don't describe a 40 W draw, so they can't break the tie. The Max Plus is the lighter box to keep by a bed.
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 3800 Gen4 clears the workday at 28% used, banking 2,289Wh — late work, extra calls, or a second laptop charge without arithmetic. The DELTA 3 Max Plus at 52% also finishes, with 831Wh 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
Both handle game day; the DELTA 3800 Gen4 keeps more in reserve (21% used vs 38%). Tailgating is a light load, though, so the number you'll feel is weight: 50.7 lbs for the DELTA 3 Max Plus 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. Both take extra batteries, and the DELTA 4 (3800) starts with less to close: 1,486 Wh short against 2,944 Wh.
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 8.5h.
$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 outage backup, I'd start with the DELTA 4 (3800). It holds 3,763 Wh against 2,048 Wh, takes 2,000 W of solar against 1,000 W and runs 3,600 W against 3,000 W, at about the same money per watt-hour. It ends our blackout night with 94% of a second night in hand, where the Max Plus has 6%. Both grow with EcoFlow's DELTA 3 Max Plus extra batteryA4B6, so the Max Plus is a real starting point rather than a dead end. Buy it if you'll carry the box often, run 12 V gear, or would rather spend $1,000 less today and add a battery later. The DELTA 4 (3800) ships in late NovemberB10.
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 Max Plus price$1,149.00 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.
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 Max Plus rates 4.2/5 (54th percentile of 29 Large-class units), and DELTA 3800 Gen4 rates 4.1/5 (48th percentile of 22 Home Backup-class units).
How the class ranking is computed →Test Notes & Caveats
Hidden gotchas and advantages we spotted that you won't find on the product page.
16.8 lb More, and No Wheels
The DELTA 4 (3800) weighs 67.5 lb to the Max Plus's 50.7 lb. It carries by a handle at each end, and EcoFlow sells a folding cart separately. One person can lift it into a car. Nobody carries it across a campground for fun.
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 Max Plus works out at 4.2 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 2,048Wh on the DELTA 3 Max Plus, so count lifetime energy — roughly 22,578 kWh against 8,192 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 Max Plus 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 Max Plus 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 Max Plus
EXPANDABLESupports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 2,048Wh.
Accepts up to 1,000W 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 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 1,000W) 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 3 Max Plus
Reviewers found the Max Plus quiet and fast to refill. At a meter it barely registered above room noise even charging at full powerA2, and one review had it full in around 70 minutesA3. They also call its output a real step up from the DELTA 3 MaxA1.
The warmest words go to its expansion. Reviewers describe growing it with extra batteries as polished and effortlessA4. Our research notes long-term owner data is still accumulatingA0.
“Bumps output to 3,000W continuous with a 6,000W surge — a significant upgrade over the DELTA 3 Max's 2,400W and 4,800W surge.”
Sources
storagereview.com · androidguys.com · t3.com · trustedreviews.com
EcoFlow DELTA 3800 Gen4
Nobody owns a DELTA 4 (3800) yet. EcoFlow put it on sale in the US on November 4 and says it ships in late NovemberB10, so this side of the page is EcoFlow's spec table and FAQ plus our own arithmeticB1B6.
I'd want to move a battery between the two boxes. If I had both, I'd take a Max Plus extra battery off the Max Plus, cable it to the DELTA 4 (3800) through EcoFlow's adapterB6, and see whether the app counts it without a fight. The whole start-small plan rests on that swap, so it's the first thing I'd try.
“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
- The Max Plus delivers more output and surge than the Max, plus a larger expansion ceiling, while staying quiet and fast-charging — a polished, higher-power take on the same platform. [DELTA 3 Max Plus · 3 entries]
- Launch-day ledger: every entry is EcoFlow's own US store and documentation, or our labelled arithmetic. No owner or reviewer evidence exists yet. [DELTA 3800 Gen4 · 12 entries]
- A1
“Bumps output to 3,000W continuous with a 6,000W surge — a significant upgrade over the DELTA 3 Max's 2,400W and 4,800W surge.”
storagereview.com / androidguys.com — DELTA 3 Max Plus review · 2026 · [positive]
- A2
“Stays genuinely quiet under typical loads, only spinning up its fans briefly during shutdown; even charging at full power the decibel meter barely registered above room noise at one meter.”
t3.com / trustedreviews.com — DELTA 3 Max Plus review · 2026 · [positive]
- A3
“Fast charging — reached 80% in about 50 minutes and full in around 70 minutes.”
t3.com — DELTA 3 Max Plus review · 2026 · [positive]
- A4
“Scalable — supports expandable capacity from 2kWh up to 10kWh via Smart Extra Batteries, with 5 charging methods; reviewers describe it as polished and effortless.”
storagereview.com / t3.com — DELTA 3 Max Plus review · 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]
- B3
“AC outlets: 5 total, four rated 20 A max and one rated 30 A max (on EcoFlow's product images, four T-slot outlets and a three-slot twist-lock). USB-A: one port, 36 W max. USB-C: one at 140 W max and two at 65 W max; the two 65 W ports share circuitry with the USB-A, limited to 16 W total when used together. No 12 V car socket.”
EcoFlow US store, us.ecoflow.com/products/delta-3800-gen4 (spec table, features and FAQ, read 2026-11-04) · 2026-11-04 · [mixed]
- B5
“Solar: two inputs, 11–60 V DC at up to 20 A and 1,000 W each, 2,000 W total (XT60i; two XT60i-to-LP60 cables are in the box). EcoFlow lists six charging methods; its 800 W Alternator Charger is limited to 500 W through the Solar/DC port.”
EcoFlow US store, us.ecoflow.com/products/delta-3800-gen4 (spec table, features and FAQ, read 2026-11-04) · 2026-11-04 · [mixed]
- B6
“Extra Battery Port: up to two extra batteries through EcoFlow's Smart Extra Battery Expansion Adapter. Compatible: the DELTA Pro 3 Smart Extra Battery and the DELTA 3 Max Plus (2,048 Wh) Smart Extra Battery. EcoFlow quotes 4–12 kWh of expandable capacity.”
EcoFlow US store, us.ecoflow.com/products/delta-3800-gen4 (spec table, features and FAQ, read 2026-11-04) · 2026-11-04 · [mixed]
- B7
“Weight 67.5 lb (30.6 kg); 16.77 × 11.36 × 12.09 in without handles, 18.76 in long with them. A handle at each end; EcoFlow sells a folding transport cart separately ($109 at launch, listed at $199). EcoFlow calls it the smallest and lightest portable power station in its class (3–4 kWh and 3,600 W).”
EcoFlow US store, us.ecoflow.com/products/delta-3800-gen4 (spec table, features and FAQ, read 2026-11-04) · 2026-11-04 · [mixed]
- 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 Max Plus if you…
- →You'll carry it often. 50.7 lb against 67.5.
- →You'd rather start at 2,048 Wh and add a DELTA 3 Max Plus extra battery when the need is realA4. It fits the DELTA 4 (3800) too if you move upB6.
- →You run 12 V gear. It has a car socket. The DELTA 4 (3800) has noneB3.
- →You recharge from a generator in short bursts. One review had it full from the wall in around 70 minutesA3.
Buy the DELTA 3800 Gen4 if you…
- →Your outages run past one night. It finishes our blackout with 1,554 Wh left against 96.
- →You have room for panels. Two inputs take 2,000 W, double the Max PlusB5.
- →You want one box to build on. It starts at 3,763 Wh and takes two extra batteries, 4 to 12 kWh by EcoFlow's figureB6.
- →You can wait until late November. That's when EcoFlow says it shipsB10.
If neither fits
If your house has a well pump or an electric dryer on 240 V, close this tab. Neither box has a 240 V outlet, so look at a unit or home battery that puts out 240 V.
The Bottom Line
For outage backup, start with the DELTA 4 (3800). It's 1,715 Wh more battery and twice the solar from day one, for about the same money per watt-hour.
If you'll carry it, or you'd rather grow into it, start with the Max Plus. The extra battery you add later fits the DELTA 4 tooB6, so nothing you buy for it is wasted if you move up.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Does the DELTA 3 Max Plus extra battery work with the DELTA 4 (3800)?
Yes. EcoFlow lists the DELTA 3 Max Plus Smart Extra Battery (2,048 Wh) and the DELTA Pro 3 Smart Extra Battery as compatible, up to two through its expansion adapter. EcoFlow quotes 4 to 12 kWh of capacity in all.
Is the EcoFlow DELTA 4 (3800) available in the US?
Yes. EcoFlow put it on sale at its US store on November 4, 2026 at $2,199, and says it ships in late November. The DELTA 3 Max Plus sells for $1,199.
Should I buy a DELTA 3 Max Plus now and add a battery later, or buy the DELTA 4 (3800)?
For outage backup or solar, buy the DELTA 4 (3800): it starts with 1,715 Wh more and takes twice the solar input. Start with the Max Plus if you'll carry it often or want to spread the cost. A Max Plus extra battery you add later also fits the DELTA 4 (3800).
Will the DELTA 3 Max Plus get through an overnight power outage?
Yes, just. Our 8-hour blackout uses 1,645 Wh, and the Max Plus finishes it with 96 Wh left. The DELTA 4 (3800) finishes the same night with 1,554 Wh left.
Which one lasts longer, the DELTA 3 Max Plus or the DELTA 4 (3800)?
The DELTA 4 (3800) is rated for 6,000 cycles and the DELTA 3 Max Plus for at least 4,000. Both carry three years of warranty plus two more when registered in EcoFlow's app.
Where to buy
EcoFlow DELTA 3 Max Plus
$1,149.00
$1,149.00 · 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.