Head-to-head test
EcoFlow DELTA 2 vs BLUETTI AC200MAX
The DELTA 2 is out of production, so this stopped being a spec fight and became one question: is the AC200MAX's 2,048Wh worth hauling 61.9 lbs and giving up a UPS mode?
Full profiles: EcoFlow DELTA 2 → · BLUETTI AC200MAX →
Written by Ian SchneiderUpdated
Solar & Off-Grid Tester, Station Arena Test Desk
Spec deltas
EcoFlow stopped selling the DELTA 2 on 2026-09-18, and its store page now forwards to the DELTA 3. That settles half of this page before the specs get a vote: one of these two is a live purchase and the other is a unit you either already own or find as leftover retailer stock.
What's left is still worth comparing, because the DELTA 2's specs didn't expire with its listing. It's 1,024Wh in a 27 lb body against the AC200MAX's 2,048Wh in 61.9 lbs, it lists a UPS mode rated no worse than 20ms where the BLUETTI lists none, and its record carries 5 years of warranty against 4. On a level shelf that's a close call for anyone whose loads are small.
The loads aren't small in the scenarios people buy these for. The eight-hour blackout profile needs 1,645Wh, and the DELTA 2 has 870Wh usable after the flat 15% derate applied to every unit here, so it quits 775Wh short while the AC200MAX finishes with 96Wh left. Take the AC200MAX, and know going in that you're lifting it with both hands.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
Capacity
A transfer time buys you one second and capacity buys you eight hours, so for an outage the ranking isn't close: the AC200MAX covers the 1,645Wh profile with 96Wh to spare, a thin pass but a pass, while the DELTA 2 covers a little over half of it. The sub-20ms handoff only earns its keep on gear that can't take a blink, and a fridge, a furnace fan and a phone charger all can.
DELTA 2: 1,024Wh nameplate, 870Wh usable after the flat 15% derateAC200MAX: 2,048Wh nameplate, 1,741Wh usableThe 8-hour blackout profile needs 1,645WhThe DELTA 2 lists a UPS mode rated no worse than 20ms; the AC200MAX's record carries no switchover time
Why it mattersBacking up a fridge or a CPAP through a storm, take the capacity. Backing up a desktop mid-render, you want the transfer mode, which means shopping EcoFlow's current line rather than either box here.
continuous output
Headroom above a unit's own continuous rating is what absorbs a startup spike: 2,600W on the AC200MAX (4,800 minus 2,200) against 900W on the DELTA 2 (2,700 minus 1,800). So a 1,500W load both units run all day can still refuse to start on the DELTA 2, because 1,500W at a 2x spike is 3,000W and its ceiling is 2,700W. The taller ceiling isn't more power for your loads. It's permission to plug in motors.
AC200MAX: 2,200W continuous, 4,800W surge, a 2.2x ratioDELTA 2: 1,800W continuous, 2,700W surge, a 1.5x ratioMotor loads briefly draw 2-3x their rated wattage at startupBoth units start every scenario peak on this page, the highest being 400W
Why it mattersIf your heaviest thing is a kettle and a laptop, the surge column is noise and you should decide on weight instead. If it's a fridge, a well pump or a circular saw, it's the whole comparison.
solar input
The AC200MAX's weekend gap is small enough that sun closes it without an extra battery: 359Wh at a 900W input is roughly 24 minutes of panels actually delivering their rating (359 divided by 900 of an hour), against about two and a half hours for the DELTA 2 to make up its 1,230Wh at 500W. One of those is a coffee break. The other is a second battery, on a platform whose base unit you can no longer order.
Both units accept expansion batteriesAC200MAX accepts 900W of solar; the DELTA 2 accepts 500WWeekend camping needs 2,100Wh: the AC200MAX ends 359Wh short, the DELTA 2 1,230Wh shortEcoFlow retired the DELTA 2 on 2026-09-18
Why it mattersAnyone planning to grow the system with more panels or a bigger bank should start from a unit still being made, which here means the AC200MAX, or the DELTA 3 line if you want to stay with EcoFlow.
The specific dimensions that decide these two units — everything else is a tie.
Your Life, Your Pick
Selected because: The two units split on exactly the load most readers arrive with: the 1,645Wh eight-hour blackout, which the AC200MAX finishes and the DELTA 2 ends 775Wh short of.
Four of the six rows come down to one number: 870Wh usable against 1,741Wh. The AC200MAX covers the blackout, the 910Wh remote workday and the 670Wh tailgate outright. The DELTA 2 takes the tailgate and the CPAP night, and misses the workday by 40Wh, which is one small appliance's worth of restraint across a day. Neither covers weekend camping's 2,100Wh, and neither belongs in the van-life conversation at 4,685Wh, where even the bigger unit finishes 2,944Wh short.
That van-life row hides one real difference, though. The AC200MAX has a 30A RV outlet on the box and the DELTA 2's record lists none. Neither has the battery for a full day in a van, but only one of them takes a shore-power cord without an adapter hunt.
What the Specs Don't Tell You
Selected because: Three of the flags here move a decision: the AC200MAX's missing UPS mode, its 4,800W surge ceiling, and the 61.9 lbs you carry to get both.
rated cycles
The most useful flag on this page argues against our pick. The DELTA 2 is the unit with a UPS mode, rated no worse than 20ms; the AC200MAX's spec sheet carries no transfer time at all, and that's a checked absence rather than a blank in our record. The AC200MAX pays it back in capacity and in a 4,800W ceiling, but if the reason you want a battery is that your desktop shouldn't reboot when a storm hiccups, it's the wrong box and no amount of watt-hours fixes that.
The warranty flag reads 5 years to 4 in the DELTA 2's favour and means less than it looks, because it's cover on a unit its maker no longer sells. That extra year isn't something a buyer today can choose. It's something a current owner already has.
Portability & Form Factor
Selected because: 27 lbs against 61.9 is what the extra 1,024Wh costs, and it's paid every time the unit moves.
weight
Double the battery costs two and a third times the weight. The AC200MAX carries 2,048Wh in 61.9 lbs, about 33Wh per pound; the DELTA 2 carries 1,024Wh in 27 lbs, about 38Wh per pound. The bigger unit isn't just heavier in proportion, it's slightly worse per pound as well.
In the driveway that reads as 27 lbs you grab one-handed out of the trunk against 61.9 lbs you set down once and leave. If the unit lives by the breaker panel, that costs you a single afternoon. If it goes to a campsite every other weekend, it's the spec you'll resent, and it's the strongest argument any reader on this page has for buying something smaller and current instead.
Growth Path
Selected because: Both take expansion batteries, but only one still has a base unit you can order, and it's the one with the 900W solar ceiling.
solar input
Both platforms take expansion batteries, so the growth question isn't whether, it's from what. The AC200MAX takes 900W of solar against the DELTA 2's 500W, and that ceiling matters more than the battery port: panels are what refill a bank, and a bigger bank needs a bigger input to be worth having.
The other half of the growth question is supply. A platform is only expandable while its maker still sells into it, and the DELTA 2's base unit has left EcoFlow's range in favour of the DELTA 3. Build outward from something still in production.
Strengths & trade-offs
EcoFlow DELTA 2
Strengths
- +Lighter by 34.9 lb
- +Longer warranty
Trade-offs
- –No major technical downsides compared to rival.
BLUETTI AC200MAX
Strengths
- +Larger battery capacity
- +Higher AC output
- +Faster solar charging
Trade-offs
- –Significantly heavier (+34.9 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
Neither unit
Two nights at 2,100Wh is more than either box holds: the AC200MAX ends 359Wh short and the DELTA 2 1,230Wh short, so both are partial cover and something on the list gets prioritised. The difference is how cheaply the gap closes. 359Wh at the AC200MAX's 900W solar ceiling is roughly 24 minutes of panels actually delivering their rating (359 divided by 900 of an hour); 1,230Wh at the DELTA 2's 500W is about two and a half hours.
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
AC200MAX
The AC200MAX finishes the night and the DELTA 2 doesn't, which is this whole page in one row: 1,741Wh usable against a 1,645Wh load, against 870Wh. Note how thin the win is. 96Wh of margin is about 5% of the AC200MAX's usable stock, so if your outage list runs longer than this profile, plan on daylight and panels rather than the battery alone. The irony is that the unit with the UPS mode is the one that runs out before morning.
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 it and it isn't close: 320Wh for the night against 870Wh and 1,741Wh usable, so the machine finishes on 37% of the DELTA 2 or 18% of the AC200MAX. Capacity has stopped being the question at this load. What's left is what you want sitting beside the bed, 27 lbs you can move with one hand or 61.9 lbs that stays where you put it, and the fact that only one of the two is still made.
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
AC200MAX
The DELTA 2 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 AC200MAX covers it outright with 831Wh 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
AC200MAX
Game day is a light load at 670Wh, which leaves the AC200MAX at 38% used against the DELTA 2's 77%, and both start the 400W peak without complaint. The AC200MAX takes the row on reserve, and it's fair to say it loses the parking lot on weight: 61.9 lbs against 27 from the trunk to the tailgate. That trade isn't on offer any more, though. The light one has left EcoFlow's range, so the real choice is carrying the 61.9 lbs or shopping a smaller unit that's still made.
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 unit covers this scenario's 4,685Wh: the DELTA 2 comes up 3,815Wh short (about 19% covered), the AC200MAX 2,944Wh (37%). This is well outside what either unit is for; the right answer here is a larger station, not a choice between these two.
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: AC200MAX runs 8.5h vs 4.2h.
$1,199 list · direct from BLUETTI
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 0–116.1hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–23.2hHigh-Draw Appliances
These reveal the real limitsscale 0–1.7h¹ 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
September 19, 2026
Verdict: the AC200MAX, on Power Score margin
Buy the AC200MAX. It's the only one of the two you can still order, since EcoFlow retired the DELTA 2 on 2026-09-18 and its store page now forwards to the DELTA 3, and it also wins the comparison on the axis most people arrive with: 1,741Wh usable against 870Wh, which is the difference between covering the 1,645Wh eight-hour blackout profile and stopping 775Wh short of morning. You pay for that in two places and both are real. It weighs 61.9 lbs against 27, and its spec sheet carries no UPS transfer time, so gear plugged into it rides out a grid cut only as long as it takes you to walk to the plug. If either one is a dealbreaker, the fix isn't the DELTA 2, because you can't buy it; it's a current unit from EcoFlow's line.
Editor-assigned confidence, based on cited owner research and spec analysis.
List prices as of September 19, 2026. The links below open BLUETTI's current price.
$1,199.00 · direct from BLUETTI
Last checked 16 days ago. Prices move — check before you buy.
Written by Ian Schneider, Solar & Off-Grid Tester · Station Arena Test Desk · Updated September 19, 2026
Black Friday · 38 days out
Price to beat:AC200MAX $1,199
We have never seen it discounted, so any real cut would be a first.
Measured Data
Benchmark scores and the full spec record, side by side.
Benchmark scores
Not rated for both units (minimum threshold unmet): UPS, 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 2 rates 4.1/5 (50th percentile of 27 Everyday-class units), and AC200MAX rates 3.4/5 (4th percentile of 26 Large-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.
AC200MAX: 61.9 lbs Is a Commitment
At 61.9 lbs, this is manageable but not fun to move. That's heavier than a large checked suitcase. How much it costs you depends on whether it rolls — wheels and a telescoping handle change the job completely at this weight, and our spec record doesn't track them, so look at the product photos before you plan on carrying it from the car.
Fan Noise: Line Ball
Both units are rated at the same 50dB — like moderate rainfall. One published figure, twice, so noise shouldn't decide this one. Both are above the ~45dB most people find disruptive for sleep, so neither is a bedroom unit.
Surge: 2,100W Apart on Starting, 400W Apart on Running
The AC200MAX peaks at 4,800W against the DELTA 2's 2,700W, yet the two run within 400W of each other (2,200W continuous against 1,800W). Startup is where that asymmetry gets paid. Headroom above a unit's own continuous rating is 2,600W here (4,800 minus 2,200) and 900W there (2,700 minus 1,800), and a motor briefly pulls 2-3x its rated draw, so a 1,500W load both units run all day can still fail to start on the DELTA 2: 1,500W at a 2x spike is 3,000W and the ceiling is 2,700W. The taller ceiling isn't extra power for your loads, it's permission to plug in motors. It also doesn't make the AC200MAX the better unit at anything else, so check the startup draw of the heaviest motor you own against 2,700W before assuming the smaller box can't hold it.
The AC200MAX Has No UPS Mode, and That's Checked
Our record carries no switchover time for the AC200MAX because BLUETTI publishes none. Read that as a real absence rather than a hole in the data: plug a desktop into it and a grid cut still reaches the desktop. The DELTA 2 is the one that sits between the wall and your gear, rated no worse than 20ms, which is fine for routers and most electronics and marginal for the fussiest PC power supplies. It's also the one you can't buy, so if a seamless handoff is the requirement, the answer is a current unit that publishes a transfer time, and the DELTA 3 line is where the DELTA 2's own store page now sends you.
Warranty: 5 Years on a Unit You Can't Buy
The DELTA 2's record carries 5 years of cover and the AC200MAX's 4. That's a real gap, and it favours the box that's no longer sold, which makes it a fact for current owners rather than a reason for anyone else. If you own a DELTA 2, register it and use the fifth year. If you're buying today, 4 years is the term on offer and it runs from your purchase date. With BLUETTI the length is the easy part: buying direct and registering is what tends to decide how a claim actually goes.
Full record above — the Test Desk pick is the AC200MAX.
Check AC200MAX price →Ownership 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 2 is no longer sold, so there is no price to work its cost per kWh from, and this comparison doesn't quote one. On what you can actually buy today, the AC200MAX works out at $0.17/kWh over its rated life. If you already own the DELTA 2, the hardware comparison still holds: over its rated life the DELTA 2 delivers about 3,072 kWh and the AC200MAX about 7,168 kWh.
Brand trust
EcoFlow
Ecosystem
Largest in portable power — 12-15 models across DELTA Pro, DELTA 3, and RIVER 3 series, plus solar panels and smart home panels
Support
US-based phone/email/chat support (1-800-368-8604). Experiences are polarized — many report hassle-free prepaid-label replacements, but others report long waits and refurbished units sent for new claims. Pro tip: buying from Costco or Amazon gives you a stronger return safety net.
Community
Largest community in the space — Reddit r/Ecoflow_community (~31K members), multiple Facebook groups, and an official community forum
App experience
Rated 4.6/5 iOS (~8,400 ratings) · 4.2/5 Android (~17,000 ratings)
Unique strength
Fastest-charging technology (X-Stream), deepest product ecosystem, and most active innovation cadence. At the top of the range sit two whole-home paths: the TITAN line, one 5 kWh unit that grows to 30 kWh, and the DELTA Pro Ultra platform, which stacks batteries and inverters further — flagship paths, not line-wide features.
Worth knowing
The DELTA 2 has left EcoFlow's range and its store page now points at the DELTA 3. The ecosystem around it, panels and app and expansion batteries, is still very much alive. The base unit is what's gone.
BLUETTI
Ecosystem
One of the broadest lineups — 15-20+ models from budget (AC2A) to flagship portable (Apex 300, 2764.8Wh). Includes specialized products: vehicle solar hubs, sodium-ion cold-weather units, and balcony storage systems.
Support
The most inconsistent support in the space. Heavily email-based with China timezone delays. Some users get smooth, efficient service; others report weeks of troubleshooting runarounds, being offered discounts on new units instead of repairs, and confusing third-party purchase claim processes. Buying direct from Bluetti's website tends to produce better support outcomes.
Community
Active and growing — Reddit r/bluetti has a dedicated community. Second-largest after EcoFlow in engagement.
App experience
Rated 4.5/5 iOS and Android — tied for best app experience in the category. V3.0 UI redesign was well-received.
Unique strength
Among the best capacity-to-price ratios available — several Elite and Apex units are the lowest $/Wh in the catalog. Widest product diversity including industry-firsts like sodium-ion cold-weather units and dual solar+alternator vehicle hubs. LFP across the rest of the range, though rated cycle life spans 2,500 (EB3A) to 6,000, and it varies WITHIN the Elite range rather than tracking it — the Elite 300 and Elite 200 V2 are rated 6,000 while the Elite 30 V2, Elite 10 Mini, Elite 320 and Elite 400 are rated 3,000+ and the Elite 100 V2 4,000+, so check the specific model. Dual-voltage (120V/240V) in flagships.
Worth knowing
BLUETTI runs one of the broadest lineups in the category, from budget units to flagships, and this model's record carries the 30A RV outlet and the 900W solar ceiling to show for its era. The published risk is service: email-first support across time zones, and no spare-parts policy on some older models. Buying direct is the version of this with the better outcomes.
Analyst note
Two of the biggest ecosystems in the category, with the same weak spot in different shapes. EcoFlow has the deepest lineup and the largest community, but support experiences are polarised, plenty of painless prepaid-label replacements alongside long waits and refurbished units sent for new claims, and it offers no parts or service outside warranty, which lands differently next to a model it has just retired. BLUETTI's support is the most inconsistent in the space and its own caveat is that older discontinued units can become unrepairable. Both improve if you buy direct and register the unit, and on this page only one of them still has an address to buy from.
Growth path
DELTA 2
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.
AC200MAX
EXPANDABLESupports BLUETTI 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 900W of solar. Suitable for a 1-2 panel setup.
Adequate ports for most setups, but heavy users may want a power strip.
Expansion batteries are BLUETTI-specific. You're investing in the BLUETTI ecosystem.
Realistic full solar rechargeat 70% of rated panel output — see methodology
Analyst note
Growth only counts if you can still buy in, and the DELTA 2 is no longer sold (EcoFlow points owners to the DELTA 3). That leaves the AC200MAX: it starts at 2,048Wh and takes BLUETTI expansion batteries, so the ceiling moves if your needs do. The DELTA 2's expandability still matters if you already own one, but it isn't a reason to pick it over the AC200MAX.
What Owners Report
Patterns from published owner reports and long-term reviews — every claim cited to its source below.
EcoFlow DELTA 2
Fan noise is the DELTA 2's one consistent complaint, and it's specific rather than vague: the fans trigger above about 120W and run continuously at high load, compared by one reviewer to a gaming laptop while charging at 1,200W, though the app can slow the charge to quiet itA1A2. EcoFlow indicated it planned to address the noise in a firmware update, which is the kind of promise worth checking the date on before you count on itA4. Against that, 18 months of testing through outages, camping trips and home-office use produced a positive verdict on reliability, charge speed and expandabilityA3, and this ledger runs deep enough to trust the pattern rather than one loud reviewA0.
“When charging at 1200W the fans sound like a gaming laptop, though you can lower the charging speed in the app to silence it.”
Sources
portablepowerlab.com
BLUETTI AC200MAX
Our research reads the AC200MAX as the older generation of its own line, the unit the AC200L was built to improve on, and nearly every write-up frames it that wayB0B3. The gripes are specific: slow AC charging, roughly two hours to get most of the way backB2, fans measured well into the 50s dBA under load at 1 meterB1, and an app that felt like an afterthoughtB3. What holds up is the hardware, described as a solid, well-liked expandable station on LFP cells rated around 3,500 cycles with a 4-year termB4. Buy it knowing you're choosing the previous generation on purpose, and that 3,500 cycles is a cycle a day for nine and a half years (3,500 divided by 365).
“The AC200MAX was a popular mid-range unit with solid capacity and an expandable battery, but its frustrations included slow charging, aging LFP chemistry, and an app that felt like an afterthought — the AC200L addresses nearly every one of these.”
Sources
diysolarforum.com · offgridbenchmark.com · firstquadcopter.com · bluettipower.eu · techradar.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
- Fan noise under moderate-to-high load is the dominant, repeatedly-cited complaint; the fan spins up above ~120W. [DELTA 2 · 3 entries]
- The AC200MAX is the older generation — louder, slower to charge, weaker app — that the AC200L was built to improve on. [AC200MAX · 3 entries]
- A1
“Fans trigger at anything above 120 watts; at maximum load (1,500–1,800W) they run continuously at ~48–55 dB. Powering medical equipment above 120W in a bedroom means listening to the fans or running an extension cable out of the room.”
portablepowerlab.com — EcoFlow Delta 2 Review: 6 Months of Real Use; PCWorld — EcoFlow Delta 2 review · 2026 · [negative]
- A2
“When charging at 1200W the fans sound like a gaming laptop, though you can lower the charging speed in the app to silence it.”
PCWorld — EcoFlow Delta 2 power station review · 2026 · [mixed]
- A3
“After 18 months of real-world testing through multiple power outages, camping trips, and daily home-office use, the unit earned recognition for fast charging, reliable LiFePO4 battery chemistry, and expandability.”
portablepowerlab.com — EcoFlow Delta 2 Review: 6 Months of Real Use · 2026 · [positive]
- A4
“EcoFlow officials indicated they plan to address the fan noise in an upcoming firmware update, as they have for other models after release.”
portablepowerlab.com — EcoFlow Delta 2 Review · 2026 (dated claim — may be partially addressed) · [mixed]
- B1
“The AC200MAX's fans are noticeably louder than the newer AC200L — measured well into the 50s dBA under load at 1 meter, versus the AC200L staying barely audible under moderate load.”
diysolarforum.com / offgridbenchmark.com — AC200MAX vs AC200L noise · 2026 · [negative]
- B2
“Slow AC charging is a common frustration — the AC200MAX takes roughly two hours to reach most of a charge, versus well under an hour for the AC200L.”
offgridbenchmark.com / firstquadcopter.com — AC200L vs AC200MAX · 2026 · [negative]
- B3
“The AC200MAX was a popular mid-range unit with solid capacity and an expandable battery, but its frustrations included slow charging, aging LFP chemistry, and an app that felt like an afterthought — the AC200L addresses nearly every one of these.”
offgridbenchmark.com — AC200L review / comparison · 2026 · [mixed]
- B4
“Still a solid, well-liked expandable power station with LFP chemistry rated around 3,500 cycles (roughly nine years of useful life) and a 4-year warranty, versus the AC200L's 5-year.”
bluettipower.eu / techradar.com — AC200MAX · 2026 · [mixed]
Research compiled September 19, 2026.
What Owners Actually Report
Drawn from 211 comments on independent review channels — not from retailer reviews, which skew to the first week of ownership. Each line is our summary of one commenter's claim, linked to the original. We record what they said, including where it contradicts the spec sheet.
EcoFlow DELTA 2
224 claims from 155 comments · 178 from owners · 60 with figures
- Runtime
- 32 · 13% negative
- Price & value
- 38 · 4% negative
- Charging
- 17 · 23% negative
- Durability
- 22 · 67% negative
- Warranty & support
- 22 · 59% negative
What owners complain about
Ignores solar unless he unplugs it from the wall, so he switched to the AC180.
Solar inputowner63 agreedsource →
His Delta 2 went bad three months after purchase and EcoFlow agreed it was defective.
Durabilityownerafter 3 months236 agreedsource →
Past 30 days the five-year warranty only gets a refurbished unit covered for 30 days.
Warranty & supportowner236 agreedsource →
What owners praise
DELTA 2 plus extra battery and 600W solar cost ~$1200 and paid for itself in under 2 years in California.
Price & valuemeasuredowner736 agreedsource →
Batteries still hold 98%+ capacity, ahead of the 80%-at-10-years warranty curve.
Durabilitymeasuredowner736 agreedsource →
Gets 180-190W into it from a 100Ah LiFePO4 via XT60i cable, no converter needed.
Chargingmeasuredowner106 agreedsource →
BLUETTI AC200MAX
76 claims from 56 comments · 54 from owners · 8 with figures
- Other
- 11 · 36% negative
- Runtime
- 7 · 11% negative
- Durability
- 7 · 75% negative
- Expandability
- 7 · 24% negative
- Solar input
- 7 · 52% negative
What owners complain about
Even the 767's loudest fan state is far quieter than the AC200MAX.
Noiseowner41 agreedsource →
Has barely used the DC outputs or the dated 12V cigarette-lighter port.
Otherowner51 agreedsource →
AC200MAX shows 0% and beeps nonstop when an external battery is on the expansion port.
Expandabilityowner3 agreedsource →
What owners praise
Runs a boat's fridge, microwave, stereo, fans and pumps for 12-16 hours on the AC200MAX.
Runtimemeasuredowner10 agreedsource →
Three years with the AC200MAX and two B230s with no complaints.
Durabilityownerafter 36 months51 agreedsource →
Has run heavy shop vacs, chop saws and water pumps on 120V and 220V.
Inverter & surgeowner51 agreedsource →
Claims are weighted by how specific they are, whether the commenter owns the unit, and how many readers agreed. Comments that mention a product under a rival's review count for more, because the commenter had no reason to be there. This is what buyers report, not our test results — for measurements we ran ourselves, see the methodology.
Who Should Buy Which
Buy the DELTA 2 if you…
- →You already own a DELTA 2: nothing here is a reason to replace it. It still starts every scenario peak on this page, still finishes a CPAP night on 37% of its usable stock, and still carries 5 years of cover from your purchase date.
- →You wanted the DELTA 2 for the 27 lbs and the sub-20ms handoff, and you're shopping today: those traits live on in EcoFlow's current DELTA 3 line, which is where its store page now sends you. We won't recommend a unit its maker has stopped selling, however good it was.
Buy the AC200MAX if you…
- →You're holding up a fridge, a modem and some lights through a long evening: 1,741Wh usable clears the 1,645Wh eight-hour profile, and a 4,800W ceiling starts the compressor without an argument.
- →Your heaviest load is a motor, a well pump or a shop vac or a compressor: 2,600W of headroom above its 2,200W continuous rating is the reason to take this over anything in the DELTA 2's class.
- →The unit is going to sit in one place, in a basement or a garage or a job trailer. 61.9 lbs stops mattering the moment it stops moving.
- →You want an RV shore-power cord to plug straight in: the 30A RV outlet is on this box and the other one's record lists none.
If neither fits
Van-life full-timers should close the tab. The 4,685Wh daily profile leaves even the AC200MAX 2,944Wh short, and the fix is a bigger station, not a tougher choice between these two. And if you want this capacity without the slow wall charging and the afterthought app, look at the newer BLUETTI generation that superseded itB2B3.
The Bottom Line
Buy the AC200MAX, because it's the only one of the two you can buy and because it's the right pick anyway. 1,741Wh usable against 870Wh is the difference between finishing the 1,645Wh blackout profile and stopping 775Wh short of morning, and 4,800W of ceiling against 2,700W is the difference between starting a motor and checking its startup draw first.
It costs you 61.9 lbs and a UPS mode it doesn't have, and neither of those is small. But the alternative isn't the light box with the sub-20ms handoff. That one left EcoFlow's range on 2026-09-18, and its own store page points at the DELTA 3 now. If the DELTA 2's shape is what you wanted, go look there. If capacity and surge are what you wanted, stop reading and get the BLUETTI.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Is the EcoFlow DELTA 2 discontinued?
Yes. EcoFlow retired it on 2026-09-18 and its store page now forwards to the DELTA 3, the like-for-like replacement in its own range. The DELTA 2's specs haven't changed and it's still worth comparing if you own one or find leftover retailer stock. It isn't a purchase we'd point a new buyer at.
Does the BLUETTI AC200MAX have a UPS mode?
No. Its spec sheet lists no transfer time, and that's a genuine absence rather than a missing field in our record. Anything plugged into it rides out a grid cut only as long as it takes you to notice and move the plug, which makes it a backup battery rather than a bridge. The DELTA 2 is the one with the mode here, rated no worse than 20ms.
Will the AC200MAX run a CPAP all night?
Comfortably, and so would the DELTA 2. A CPAP is about 40W, so eight hours is 320Wh: 18% of the AC200MAX's 1,741Wh usable and 37% of the DELTA 2's 870Wh. At that load capacity has stopped being the question. Worth knowing that a 40W draw sits well below the roughly 120W where the DELTA 2's fans kick in; we have no equivalent threshold for the AC200MAX, only that its fans measure into the 50s dBA under load.
Which one is better for a power outage?
The AC200MAX, and it isn't close on energy: 1,741Wh usable finishes the 1,645Wh eight-hour profile with 96Wh left, while the DELTA 2 stops 775Wh short. Watch that margin, though. 96Wh is about 5% of what the AC200MAX holds, so if your outage list is longer than a fridge and some lights, plan on daylight and panels rather than on the battery alone.
Should I buy a used DELTA 2 instead of the AC200MAX?
The hardware holds up: 3,000 cycles is a cycle a day for over eight years (3,000 divided by 365), and 18 months of testing produced a positive verdict on reliability and charging. Two things should give you pause. It's half the battery, 1,024Wh against 2,048Wh, and support on a discontinued unit is a thinner promise than support on a current one, particularly since EcoFlow offers no parts or service outside warranty. If the light weight is what you're after, the DELTA 3 line is the current version of that idea.
Brand matchup
EcoFlow vs BLUETTI: measured across every matchup →Where to buy
EcoFlow DELTA 2
No longer sold
BLUETTI AC200MAXPick
$1,199.00
$1,199.00 · direct from BLUETTI
Last checked 16 days ago. Prices move — check before you buy.
Prices may vary by retailer and are subject to change.