Head-to-head test
EcoFlow DELTA 3 Max Plus vs EcoFlow DELTA 3 Ultra Plus
The Ultra Plus costs $400 more for half again the battery, which makes it the cheaper one per lifetime kilowatt-hour. It also finishes a camping weekend the Max Plus falls short on. The Max Plus answers with 23.6 fewer pounds to carry.
Full profiles: EcoFlow DELTA 3 Max Plus β Β· EcoFlow DELTA 3 Ultra Plus β
Looking for a different matchup? EcoFlow DELTA 3 Ultra vs DELTA 3 Ultra Plus
Written by Gunner GustafsonUpdated
Whole-Home Backup Tester, Station Arena Test Desk
Spec deltas
During the CZU fires I wheeled a 116-pound battery down my driveway in a hurry. Since then I've judged backup boxes partly by how fast they go into a truck. The DELTA 3 Max Plus weighs 50.7 lbs and the Ultra Plus weighs 74.3. The first is a one-person carry. The second is a lift you plan.
The extra weight buys battery. The Ultra Plus holds half again the energy of the Max Plus for $400 more, on the same cycle rating. Over its life it works out to $0.13 per lifetime kilowatt-hour against the Max Plus's $0.15.
Where the size shows is a full weekend away. Our camping weekend draws more than the Max Plus holds on its label. After the flat 15% we take off every battery for conversion losses, it comes up 359Wh short. The Ultra Plus finishes the same weekend with 511Wh left.
What the Numbers Reveal
Each conclusion stated first β the numbers behind it on one line, the full analysis below.
Capacity
A top-up from the car or an afternoon of sun would likely close that, but it still means planning the weekend around the battery.
Weekend Camping needs 2,100WhMax Plus holds 2,048Wh; Ultra Plus holds 3,072Wh
Why it mattersIf a weekend away is the reason you're buying, the Ultra Plus finishes it with 511Wh left and no planning.
continuous output
It gives up nothing on solar charge time, and it adds output.
Max Plus: 1,000W solar on 2,048Wh, 3,000W continuous outputUltra Plus: 1,600W solar on 3,072Wh, 3,600W continuous output
Why it mattersThe costs of sizing up are the $400 and the weight.
The specific dimensions that decide these two units β everything else is a tie.
Lifetime Value
Selected because: Same cycle rating on both, so the bigger pack works out cheaper per lifetime kWh.
cost / lifetime kWh
Both packs are rated for 4,000 cycles, about 11 years of daily use either way. What changes is how much energy each one delivers over that life. With matching ratings, sizing up here costs more at the register and less per kilowatt-hour.
The warranty is five years on both, so nothing in this section pulls the other way.
Your Life, Your Pick
Selected because: Weekend Camping is the one row that splits pass from fail, and the 8-hour blackout leaves the Max Plus nearly empty.
Two scenarios separate these. The camping weekend is a fail for the Max Plus. The 8-hour blackout is a pass, but the Max Plus finishes it at 94% used with 96Wh left. It survives the night with almost nothing for the morning.
The Ultra Plus ends that same blackout at 63% used, with over half a second night in reserve. In a canyon where storm outages run long, I'd buy the bigger one. The CPAP night, workday and tailgate are passes for both, and Van Life Daily beats both.
Portability & Form Factor
Selected because: Weight is the Max Plus's real advantage, and it scales with the battery.
weight
From the trunk to a campsite, the Max Plus is a one-person carry. The Ultra Plus wants bent knees and a clear path.
Our spec record doesn't track wheels, and at the Ultra Plus's weight they'd change the job, so check the product photos before you plan on carrying it far.
Growth Path
Selected because: Both take expansion batteries; the Ultra Plus's larger solar input matters for a build-out.
solar input
Both take EcoFlow's expansion batteries, and reviewers call the Max Plus's scaling up to 10kWh polished and effortlessA4. Neither buyer is stuck with the size they start at.
The gap is solar. The Ultra Plus takes 1,600W of panels to the Max Plus's 1,000W. That matters once the system grows past one box and you add panels to feed it.
Strengths & trade-offs
EcoFlow DELTA 3 Max Plus
Strengths
- +Costs $400 less
- +Lighter by 23.6 lb
Trade-offs
- βWeaker inverter (-600W) limits appliance compatibility.
EcoFlow DELTA 3 Ultra Plus
Strengths
- +Larger battery capacity
- +Higher AC output
- +Faster solar charging
Trade-offs
- βSubstantially more expensive (+$400) than the DELTA 3 Max Plus.
- βSignificantly heavier (+23.6 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 Β· 2 nights Β· needs 2,100Wh
Weekend Camping
Two nights off-grid with essential comfort
DELTA 3 Ultra Plus
The one row that splits pass from fail. The Max Plus covers about 83% of the weekend and comes up 359Wh short. The Ultra Plus finishes with 511Wh left.
Battery budget usedlower = more headroom
LOADΒ Β Phone Charger 15WΓ6h Β· LED Lights 40WΓ8h Β· Box Fan 75WΓ14h Β· CPAP Machine 40WΓ16h
SCN-02 Β· 8 hours Β· needs 1,645Wh
8-Hour Blackout
Keep the essentials running through a night without power
DELTA 3 Ultra Plus
Both last the night. The Max Plus ends at 94% used with 96Wh left, a battery you'd want back on the wall by morning. The Ultra Plus ends at 63% with over half a night in reserve.
Battery budget usedlower = more headroom
LOADΒ Β Fridge 150WΓ8h Β· Router + Modem 20WΓ8h Β· LED Lights (4 bulbs) 40WΓ6h Β· Phone Charger 15WΓ3h
SCN-03 Β· 8 hours Β· needs 320Wh
CPAP Overnight
Sleep therapy without interruption β the #1 medical use case
Either unit
A CPAP draws about 40W, so either covers the night several times over, at 18% and 12% used. Choose on price or weight.
Battery budget usedlower = more headroom
LOADΒ Β CPAP Machine 40WΓ8h
SCN-04 Β· 8 hours Β· needs 910Wh
Remote Workday
Full work day off-grid without power anxiety
DELTA 3 Ultra Plus
Both finish the day. The Max Plus is at 52% used with 831Wh of slack. The Ultra Plus is at 35%, with room for a late call and a second laptop charge.
Battery budget usedlower = more headroom
LOADΒ Β Laptop 60WΓ8h Β· External Monitor 30WΓ8h Β· Router + Modem 20WΓ8h Β· Phone Charger 15WΓ2h
SCN-05 Β· 4 hours Β· needs 670Wh
Tailgate Party
Game day power for the crew
DELTA 3 Ultra Plus
A light load for both, at 38% and 26% used. You'd carry 50.7 lbs or 74.3 from the trunk to the setup spot.
Battery budget usedlower = more headroom
LOADΒ Β Blender 400WΓ0.5h Β· LED TV (55") 80WΓ4h Β· Bluetooth Speaker 15WΓ4h Β· Phone Charger (Γ3) 45WΓ2h
SCN-06 Β· 24 hours Β· needs 4,685Wh
Van Life Daily
A full day of mobile living β the ultimate endurance test
Neither unit
Neither is built for this. The Max Plus covers about 37% of the day and the Ultra Plus about 56%. Full-time van power means a bigger base plus expansion batteries.
Battery budget usedlower = more headroom
LOADΒ Β Mini-Fridge 150WΓ24h Β· Laptop 60WΓ4h Β· Phone Charger 15WΓ3h Β· LED Lights 40WΓ5h Β· Fan 75WΓ8h
The Load Test
RUNTIME = (Wh Γ 0.85) Γ· 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 3 Ultra Plus runs 12.7h vs 8.5h.
$1,599 list Β· direct from EcoFlow
Planning for more than this? Describe your whole setup and get it sizedΒ β
Modeled from the spec record β same math as the tables below. Methodology
Runtime by appliance
Real-world runtime estimates for common appliances, modeled at 85% inverter efficiency.ΒΉ
Essentials
The basics you need runningscale 0β174.1hComfort & Convenience
Makes off-grid life actually enjoyablescale 0β34.8hHigh-Draw Appliances
These reveal the real limitsscale 0β2.6hΒΉ Runtime = (capacity Γ 0.85) Γ· 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 β see methodology.
Conclusion
October 25, 2026
Verdict: the DELTA 3 Ultra Plus, on Power Score margin
Buy the Ultra Plus if your loads ever reach a full camping weekend or a long blackout. It holds half again the battery for $400 more, which makes it the cheaper of the two per lifetime kilowatt-hour. The Max Plus comes up 359Wh short on the camping weekend and finishes an 8-hour blackout nearly empty. Its case is weight. It's 23.6 lbs lighter, and if your loads stay well inside it, that's the better trade.
Editor-assigned confidence, based on cited owner research and spec analysis.
List prices as of October 25, 2026. The links below open EcoFlow's current price.
$1,599.00 Β· direct from EcoFlow
Last checked 28 days ago. Prices move β check before you buy.
or check the DELTA 3 Max Plus price$1,199.00 list
Written by Gunner Gustafson, Whole-Home Backup Tester Β· Station Arena Test Desk Β· Updated October 25, 2026
Black Friday Β· 26 days out
Prices to beat:DELTA 3 Max Plus $1,099DELTA 3 Ultra Plus $1,499
The lowest we have recorded for each. A Black Friday price above it is a sale that unit has already had.
Measured Data
Benchmark scores and the full spec record, side by side.
Benchmark scores
Not rated for both units (minimum threshold unmet): CPAP, Apartment Balcony.
Full specifications
α΅ Derived: price Γ· rated capacity. See the data behind our comparisons β
Comparison ToolAdd more power stations, side by sideOpen Tool βHow these numbers are produced
Numeric verification
Every figure on this page traces to our spec database or arithmetic on it β no estimated numbers.
Owner claims
Statements about owner experience are cited to published reviews β see Sources & Research Notes below.
Runtime model
Runtime = (rated capacity Γ 0.85 inverter efficiency) Γ· 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 βClass ranking (the star rating)
Each unit's star score is a category ranking, not customer reviews β 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 5β . Here, DELTA 3 Max Plus rates 4.3/5 (59th percentile of 28 Large-class units), and DELTA 3 Ultra Plus rates 4.9/5 (96th percentile of 28 Large-class units).
How the class ranking is computed βTest Notes & Caveats
Hidden gotchas and advantages we spotted that you won't find on the product page.
23.6 lbs Buys 1,024Wh
Both hold about the same energy per pound, so the Ultra Plus isn't built heavy for its size.
No warranty story here
Both carry five years of cover. Per dollar spent the Max Plus buys more years, and that's only its lower price showing up in the division.
Full record above β the Test Desk pick is the DELTA 3 Ultra Plus.
Check DELTA 3 Ultra Plus price βor check the DELTA 3 Max Plus priceOwnership Analysis
What happens after you buy β 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
β warranty ends Β· Reaching the cycle rating means ~80% capacity remains β degraded, not dead.
Analyst note
The DELTA 3 Max Plus is cheaper to buy, but the DELTA 3 Ultra Plus is cheaper to own. At $0.13/kWh over its lifetime vs $0.15/kWh, the DELTA 3 Ultra Plus's higher cycle life and capacity make each dollar go further over the years. One thing to know reading the table: both carry the same 4,000-cycle rating, so the lifetime rows are sticker price and capacity in disguise β the wear horizon is identical and decides nothing here.
Growth path
DELTA 3 Max Plus
EXPANDABLESupports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit β 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 3 Ultra Plus
EXPANDABLESupports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit β useful if your needs may climb past 3,072Wh.
Accepts up to 1,600W 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 β see methodology
Analyst note
Both expand, but the DELTA 3 Ultra Plus's higher solar ceiling (1,600W vs 1,000W) gives it the stronger off-grid growth path β more panels can feed a bigger bank as it grows.
What Owners Report
Patterns from published owner reports and long-term reviews β every claim cited to its source below.
EcoFlow DELTA 3 Max Plus
Reviews of the Max Plus are positive and come from review sites, with long-term owner reports still building upA0. Reviewers see it as a real step up from the plain DELTA 3 Max, with 3,000W continuous and 6,000W surgeA1.
One tester found the fans barely lifted the meter above room noise, even while charging at full powerA2. Charging is quick, about 80% in 50 minutesA3.
βBumps output to 3,000W continuous with a 6,000W surge β a significant upgrade over the DELTA 3 Max's 2,400W and 4,800W surge.β
Sources
storagereview.com Β· androidguys.com Β· t3.com Β· trustedreviews.com
EcoFlow DELTA 3 Ultra Plus
Coverage of the Ultra Plus is also recent and review-site basedB0. One review covered both units and found each quiet under sustained loadsB13. The same review says both handle overnight dew, and that the Ultra Plus survives a 0.2m dropB14. Another found it keeps full output while it charges, where many stations cap output at the input wattageB4.
The knock is the weight, which one reviewer called "thunderous"B9.
βeven when you're pushing it hard, the DELTA 3 Ultra Plus runs much quieter than older EcoFlow models, like the DELTA 2 Maxβ
Sources
thesolarlab.com Β· postperspective.com Β· appleinsider.com Β· digitaltrends.com Β· storagereview.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
- The Max Plus delivers more output and surge than the Max, plus a larger expansion ceiling, while staying quiet and fast-charging β a polished, higher-power take on the same platform. [DELTA 3 Max Plus Β· 3 entries]
- Professional reviewers consistently describe the fan noise as very quiet even under heavy load, comparable to EcoFlow's premium DELTA Pro Ultra line. [DELTA 3 Ultra Plus Β· 3 entries]
- Reviewers report solid UPS/pass-through charging performance with no noticeable switchover issues or output throttling tied to input wattage. [DELTA 3 Ultra Plus Β· 2 entries]
- The unit's high weight (~74 lbs) and premium MSRP are repeatedly flagged as drawbacks, though discounted street pricing is seen as making the value proposition much stronger. [DELTA 3 Ultra Plus Β· 3 entries]
- Build quality/durability is praised as substantial and non-fragile across multiple independent reviews. [DELTA 3 Ultra Plus Β· 2 entries]
- A1
βBumps output to 3,000W continuous with a 6,000W surge β a significant upgrade over the DELTA 3 Max's 2,400W and 4,800W surge.β
storagereview.com / androidguys.com β DELTA 3 Max Plus review Β· 2026 Β· [positive]
- A2
βStays 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.β
t3.com / trustedreviews.com β DELTA 3 Max Plus review Β· 2026 Β· [positive]
- A3
βFast charging β reached 80% in about 50 minutes and full in around 70 minutes.β
t3.com β DELTA 3 Max Plus review Β· 2026 Β· [positive]
- A4
βScalable β supports expandable capacity from 2kWh up to 10kWh via Smart Extra Batteries, with 5 charging methods; reviewers describe it as polished and effortless.β
storagereview.com / t3.com β DELTA 3 Max Plus review Β· 2026 Β· [positive]
- B4
βMany power stations limit you to the input wattage when outputting power, but this EcoFlow power station does notβ
thesolarlab.com β EcoFlow DELTA 3 Ultra Plus Review: The Ultimate DELTA? Β· unknown Β· [positive]
- B9
βWeighing in at a thunderous 74 pounds, the Ultra is not considered lightweight by any standardsβ
appleinsider.com β EcoFlow Delta 3 Ultra Plus review: Premium, but solid power Β· 2025-11 Β· [mixed]
- B13
βEach unit operates quietly at under 25dB, remaining unobtrusive even during sustained loadsβ
storagereview.com β EcoFlow DELTA 3 Max Plus & Ultra Plus Review Β· 2025-09-30 Β· [positive]
- B14
βthe Delta 3 Ultra Plus can withstand drops of up to 0.2m, and both models feature moisture resistance to mitigate risks from overnight dewβ
storagereview.com β EcoFlow DELTA 3 Max Plus & Ultra Plus Review Β· 2025-09-30 Β· [positive]
Research compiled October 25, 2026.
Who Should Buy Which
Buy the DELTA 3 Max Plus if youβ¦
- βYou carry it often and your loads stay well under 2,048Wh: a workday, a tailgate, a CPAP night.
- βYou want EcoFlow's expansion batteries at the lower entry price.
- βYou charge a lot of gadgets over USB-C. The Max Plus has three USB-C ports to the Ultra Plus's two.
- βEvery pound counts. The Max Plus is 23.6 lbs lighter.
Buy the DELTA 3 Ultra Plus if youβ¦
- βA full weekend away is the job. The Ultra Plus finishes it with 511Wh left, where the Max Plus comes up short.
- βYour outages run past one evening. The Ultra Plus ends an 8-hour blackout at 63% used instead of 94%.
- βYou plan to grow into solar. The Ultra Plus takes 1,600W of panels to the Max Plus's 1,000W.
If neither fits
If Van Life Daily is your day, neither box is close. The Max Plus covers about 37% of it and the Ultra Plus about 56%, so start from a bigger base with expansion batteries. If you only need a router, phones and a lamp through a few short outages a year, both are more than the job needs, and a 1kWh-class unit does it for far less.
The Bottom Line
Cycle life, surge ratio, switchover and warranty match. The Ultra Plus adds half again the battery, more output and more solar input, and it costs less per lifetime kilowatt-hour.
Buy the Ultra Plus if a full weekend away or a long outage is on the list. Buy the Max Plus if your loads stay well under its capacity and you'd rather carry 23.6 fewer pounds on every trip.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
What's actually different between the DELTA 3 Max Plus and the DELTA 3 Ultra Plus?
Capacity (2,048Wh against 3,072Wh), continuous output (3,000W against 3,600W), surge (6,000W against 7,200W), solar input (1,000W against 1,600W) and weight (50.7 lbs against 74.3). Cycle life (4,000), surge ratio (2.0x), switchover (no worse than 10ms) and warranty (five years) are the same.
Can the DELTA 3 Max Plus handle a full weekend of camping?
Not without a recharge. Our modeled camping weekend draws about 2,100Wh, which is more than the Max Plus's 2,048Wh capacity. After usable losses it comes up about 359Wh short. The Ultra Plus covers the same weekend with about 511Wh to spare.
Is the Ultra Plus cheaper to own long-term despite the higher price?
Yes. Both are rated for 4,000 cycles, and the Ultra Plus delivers half again as much energy over that life, so its cost per lifetime kilowatt-hour is lower: $0.13 against $0.15 for the Max Plus.
Is the Ultra Plus's extra weight worth it?
Only if you need the extra capacity. Both units hold about the same energy per pound, so the 23.6 lbs is the cost of carrying 1,024Wh more battery. If your loads don't need 3,072Wh, you're carrying weight you won't use.
Where to buy
EcoFlow DELTA 3 Max Plus
$1,199.00
$1,199.00 Β· direct from EcoFlow
Last checked 28 days ago. Prices move β check before you buy.
EcoFlow DELTA 3 Ultra PlusPick
$1,599.00
$1,599.00 Β· direct from EcoFlow
Last checked 28 days ago. Prices move β check before you buy.
Prices may vary by retailer and are subject to change.