Head-to-head test
BLUETTI AC200MAX vs BLUETTI Elite 400
Whether you'll ever cross 3,840Wh: under that ceiling the Elite 400 is quieter, cheaper per watt-hour, and finishes a weekend the AC200MAX can't; over it, only the expandable AC200MAX can grow there.
Written by Gunner GustafsonUpdated
Whole-Home Backup Tester, Station Arena Test Desk
BLUETTI
AC200MAX
3,590Power Score · Appliance Class
$1,199.00 list · direct from BLUETTI
BLUETTI
Elite 400
5,086Power Score · The AC & Fridge Zone
$1,399.00 list · direct from BLUETTI
Spec deltas
The Elite 400 wins this matchup for most buyers, and the cleanest reason is arithmetic: its 1,792Wh of extra capacity over the AC200MAX costs $0.28 per watt-hour, less than the AC200MAX's own $0.59. The upgrade is the cheapest energy on the page, not the priciest.
The two aren't quite the same class. The AC200MAX is a 61.9 lb, 2,048Wh mid-range unit you can expand; the Elite 400 is an 85 lb, 3,840Wh unit that's sealed but quieter, faster to charge, and carries a 15ms UPS. Scenario after scenario, the Elite has the capacity to finish and the AC200MAX doesn't — it can't quite cover a weekend of camping on its own.
So the decision comes down to one line: will you ever need more than 3,840Wh? Under that ceiling the Elite 400 is the better unit on almost every axis that isn't weight or price. Over it, the AC200MAX's expansion path is the only route here, and worth the louder fan to get it.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
Capacity
That added capacity costs less per watt-hour than the AC200MAX's own energy at $0.59 — the upgrade is the better-priced battery, not the pricier one.
AC200MAX: $1,199 for 2,048WhElite 400: $1,699 for 3,840Wh
Why it mattersAnyone treating the $500 gap as a splurge should see it's the cheapest capacity in the matchup and stop hesitating.
It runs out mid-Sunday on its own, while the Elite 400's 3,840Wh covers the same weekend using 64% of its tank and keeps a day in reserve.
AC200MAX capacity: 2,048WhWeekend camping draws about 2,100Wh
Why it mattersWeekend campers who don't want to ration power on the last morning should take the Elite.
The Elite is 20 dBA quieter and its 15ms switchover keeps a CPAP or desktop alive through a grid blink, two problems the AC200MAX hands you at exactly the distance you'd notice them.
AC200MAX: 50 dBA under loadA1Elite 400: 30 dBAElite 400 has a 15ms UPS; AC200MAX has none
Why it mattersBedroom, home-office, and CPAP buyers should keep the AC200MAX out of the sleeping space.
The AC200MAX's expansion path is the only route past 3,840Wh in this matchup — the catch is that you're stacking capacity onto the louder, slower-charging older unit, and the expansion batteries aren't cheap.
Van life daily draws about 4,685WhElite 400 is fixed at 3,840Wh with no expansionB1AC200MAX accepts BLUETTI expansion batteriesA3
Why it mattersBuyers who know they'll cross 3,840Wh are the one group the AC200MAX genuinely serves better.
The specific dimensions that decide these two units — everything else is a tie.
Your Life, Your Pick
Selected because: Elite wins every scenario that fits its class; AC200MAX can't finish a weekend — the concrete decider.
The Elite 400 wins every scenario that fits a unit this size, and the reason is simply that it has the capacity to finish. Weekend camping is the tell: a weekend wants about 2,100Wh and the AC200MAX holds 2,048Wh before you count any inverter losses, so it's rationing by Sunday while the Elite covers the same trip on 64% of its tank.
The scenarios both units clear easily — a workday, a tailgate, a CPAP overnight — don't discriminate on capacity, so they get decided on the bedside experience instead, where the Elite's quieter fan and 15ms UPS pull ahead. The one scenario that rewards the AC200MAX is van life at 4,685Wh, which neither base unit reaches — but only the AC200MAX can bolt on more battery to try.
Lifetime Value
Selected because: The marginal $0.28/Wh chain plus the honest split: cheaper per lifetime kWh (p2) but cheaper per warranty year (p1).
cost / lifetime kWh
Per watt-hour, the Elite 400 is the cheaper unit: $0.44 against the AC200MAX's $0.59, and its extra capacity over the AC200MAX pencils out to $0.28 per watt-hour — the cheapest energy in the matchup. Over full cycle life that carries through to $0.15 per lifetime kWh versus $0.17, so the computed cheaper-to-own unit is the Elite.
The honest asterisk runs the other way on the shorter horizon most people actually reach: by warranty year the AC200MAX costs $300 to the Elite's $340, because it's $500 cheaper up front against one fewer year of coverage. So this isn't a runaway on price. The Elite is cheaper per unit of energy, the AC200MAX cheaper per year you're covered, and the $500 gap buys real capacity rather than disappearing.
Growth Path
Selected because: Same-brand base-vs-upgrade; expansion is AC200MAX's one real edge and the Elite's one real weakness. Fold brand trajectory here.
solar input
This is a base-versus-upgrade decision inside one brand, and the fork is expansion. The AC200MAX takes BLUETTI expansion batteries, so its 2,048Wh base is a floor you can build on — the only way in this pair to pass 3,840Wh. The Elite 400 is sealed: what you buy is the ceiling, and outgrowing it means a second unit.
For most buyers the ceiling never bites, and the Elite is where BLUETTI's newer engineering shows — 15ms UPS, a 20 dBA quieter fan, faster charging, and a longer warranty, all things the field consensus flags the older AC200MAX generation as lackingA3. But the honest catch belongs to the Elite here: if you already know a van build or partial-home backup is coming, its sealed design is the one place the AC200MAX's expandability earns its price, even stacked onto older chemistry.
Portability & Form Factor
Selected because: 61.9 vs 85 lb is a real class gap — one-person lift vs trolley unit.
weight
At 61.9 lb the AC200MAX is a bent-knee, two-hands, one-person lift into a trunk. The Elite 400 is 85 lb and ships with a trolley because at that weight it needs one — reviewers confirm the wheels are what make it manageableB3.
That 23 lb is the AC200MAX's clearest win. If the unit lives in one spot — a garage, a closet, a van floor — it's irrelevant and you should ignore it. If it moves between house, car, and campsite on a regular basis, you feel the difference every single trip, and no amount of the Elite's extra capacity carries itself up the basement stairs for you.
What the Specs Don't Tell You
Selected because: Noise (50 vs 30 dBA), UPS (Elite only, 15ms), and surge ratio (AC200MAX actually higher) — the non-capacity differentiators.
rated cycles
Two of the three non-capacity differences favor the Elite decisively. Its fan runs at 30 dBA against the AC200MAX's 50 dBA under load, which owners confirm is genuinely loudA1, and it adds a 15ms UPS that keeps a desktop or CPAP running through an outage where the AC200MAX would let it reboot.
The surprise is that the cheaper, older unit surges harder. The AC200MAX peaks at 4,800W against its 2,200W continuous — a 2.2x headroom that starts stubborn motors the Elite's 3,900W surge might balk at. In practice both start a typical fridge or well pump, so this only matters at the edge of a big compressor, but it's a real point in the AC200MAX's favor and worth naming.
Strengths & trade-offs
BLUETTI AC200MAX
Strengths
- +Costs $200 less
- +Lighter by 23.1 lb
Trade-offs
- –No major technical downsides compared to rival.
BLUETTI Elite 400
Strengths
- +Larger battery capacity
- +Higher AC output
- +Longer warranty
- +Faster solar charging
Trade-offs
- –Significantly heavier (+23.1 lbs), making it harder to move.
- –Very heavy unit that may be difficult for one person to lift.
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
Elite 400
A weekend draws about 2,100Wh, and the AC200MAX holds 2,048Wh before you subtract a single inverter loss — it comes up short by Sunday. The Elite 400 covers the same weekend on 64% of its tank and still has a day in reserve.
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
Elite 400
Both survive, but the Elite 400 finishes at just 50% used. That's enough reserve for a second blackout night. The AC200MAX at 94% leaves little margin if the outage runs longer than expected. In storm-prone areas, that remaining capacity is insurance.
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 units treat a CPAP's 320Wh as a rounding error, so call it a tie on capacity. The tiebreaker is the bedside: the Elite runs at 30 dBA with a 15ms UPS, the AC200MAX at 50 dBA with none. Two feet from your pillow, that's the whole decision.
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
Elite 400
The Elite 400 gives you a comfortable buffer at 28%. Enough to work late, join extra video calls, or charge a second device without worry. The AC200MAX at 52% works but leaves less room for the unexpected. For daily remote work, that peace of mind matters.
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
Elite 400
Both handle game day, and the Elite 400 does it with more in reserve — 21% used against 38%. Tailgating is a light load, so that headroom counts for less here than the 23 lbs you'll actually carry across the parking lot.
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
A full van day wants about 4,685Wh, and neither base unit reaches it — the Elite tops out at 3,840Wh sealed, the AC200MAX at 2,048Wh. The difference is that the AC200MAX can bolt on an expansion battery to get closer; the Elite simply can't. This is the one scenario that rewards the older unit.
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 six 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: Elite 400 runs 15.9h vs 8.5h.
$1,399 list · direct from BLUETTI
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 0–217.6hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–43.5hHigh-Draw Appliances
These reveal the real limitsscale 0–3.3h¹ 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
July 16, 2026
Verdict: the Elite 400, on Power Score margin
The Elite 400 wins for most buyers. It clears every scenario that fits its class, runs 20 dBA quieter, adds a 15ms UPS the AC200MAX lacks, and its extra 1,792Wh of capacity costs $0.28 per watt-hour — cheaper than the AC200MAX's own $0.59. Per lifetime kWh it's also the cheaper unit to own ($0.15 vs $0.17), though by warranty year the AC200MAX edges it ($300 vs $340), so the cost case is close rather than lopsided. The AC200MAX keeps two honest advantages: it's 23 lb lighter to carry, and it's the only one here you can expand past 3,840Wh. Frequent solo haulers and buyers who know a van build or home-backup expansion is coming should take it; everyone else takes the Elite.
Editor-assigned confidence, based on cited owner research and spec analysis.
List prices as of July 16, 2026. The links below open BLUETTI's current price.
$1,399.00 list · direct from BLUETTI
or check the AC200MAX price$1,199.00 list
Written by Gunner Gustafson, Whole-Home Backup Tester · Station Arena Test Desk · Updated July 16, 2026
Measured Data
Benchmark scores and the full spec record, side by side.
Benchmark scores
Not rated for both units (minimum threshold unmet): UPS, Tailgating, Apartment Balcony.
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, AC200MAX rates 3.4/5 (4th percentile of 25 Large-class units), and Elite 400 rates 3.6/5 (20th percentile of 16 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.
61.9 vs 85 pounds
The AC200MAX is a 61.9 lb one-person lift; the Elite 400 is 85 lb and ships with a trolley because it has to. If the unit lives in one spot, ignore this. If it moves between house, trunk, and campsite, you feel the 23 lb every trip.
50 dBA vs 30 dBA
The AC200MAX's fan runs at 50 dBA under load; the Elite 400 holds 30. In a garage, nobody cares. In a bedroom or home office, one of these disappears into the background and the other doesn't.
The Elite 400's one real weakness
What you buy is the ceiling. The Elite 400 is a sealed 3,840Wh unit with no expansion port, so if your needs ever cross that line, your upgrade path is a second unit. For most buyers that never bites. If you already know you're heading toward van-scale or partial-home loads, it's the one reason on this page to pause — and the one place the AC200MAX's expandability earns its keep.
The cheaper unit surges harder
The AC200MAX peaks at 4,800W against its 2,200W continuous — a 2.2x headroom that can start stubborn motors the Elite's 3,900W surge might balk at. It's the rare spec where the older, cheaper box wins outright. In practice both start a typical fridge or well pump; this only matters at the edge of a big compressor.
Only the Elite 400 rides through an outage
The Elite 400 switches to battery in 15ms — fast enough that a desktop or CPAP never registers the grid drop. The AC200MAX has no true UPS mode, so anything that can't survive a blink will reboot. For a fridge it's irrelevant; for a home server or a CPAP it's the ballgame.
Full record above — the Test Desk pick is the Elite 400.
Check Elite 400 price →or check the AC200MAX 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 AC200MAX is cheaper to buy, but the Elite 400 is cheaper to own. At $0.12/kWh over its lifetime vs $0.17/kWh, the Elite 400's higher cycle life and capacity make each dollar go further over the years.
Growth path
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.
Generous port selection supports complex multi-device setups.
Expansion batteries are BLUETTI-specific. You're investing in the BLUETTI ecosystem.
Elite 400
FIXED CAPACITYFixed at 3,840Wh — a sealed, complete system. No expansion port, but that capacity already covers heavy and multi-day loads.
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.
Realistic full solar rechargeat 70% of rated panel output — see methodology
Analyst note
Don't read the AC200MAX's expandability as a straight win here: it starts at 2,048Wh, below the Elite 400's 3,840Wh, so a first expansion battery largely buys back capacity the Elite 400 already includes. It only pulls ahead if you'd grow past 3,840Wh — short of that, the Elite 400's larger fixed capacity is the simpler value.
What Owners Report
Patterns from published owner reports and long-term reviews — every claim cited to its source below.
BLUETTI AC200MAX
Owners place the AC200MAX as the capable older generation rather than the current one — a well-liked, expandable mid-range station whose frustrations are consistent. Its fans measure into the 50s dBA under loadA1, and its AC charging takes roughly two hours to do what newer units finish in under oneA2. The app, reviewers note, feels like an afterthoughtA3.
None of that is a dealbreaker for a garage or a campsite, and the field consensus lands it as a solid unit the newer generation was built to fixA3. In its favor, the LFP chemistry is rated around 3,500 cycles — roughly nine years of useful life — behind a 4-year warrantyA4.
“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
BLUETTI Elite 400
The Elite 400 reads, in field reports, as one of the more complete units at its tier: 3,840Wh, fast charging, a 15ms UPS, and a built-in trolley in one boxB2. It's heavy at about 85 lb, though reviewers note the wheels make that manageable and that it's lighter than some rivalsB3.
The two caveats owners keep raising are structural — only two AC sockets and no battery expansion whatsoeverB4B1. The verdict from the field is 'powerful, but not quite as good as it could have been'B4, with the missing third outlet and the sealed capacity as the asterisks on an otherwise strong unit.
“BLUETTI's largest Elite-range unit — a 3,840Wh LiFePO4 battery with 2,600W continuous output (3,900W Power Lifting), fixed at native capacity with no expansion.”
Sources
techradar.com · amazon.com · backuppowerhub.com · cleantechnica.com · notebookcheck.net · thesolarlab.com · edinburghnews.scotsman.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 AC200MAX is the older generation — louder, slower to charge, weaker app — that the AC200L was built to improve on. [AC200MAX · 3 entries]
- Large 3,840Wh LFP capacity, fast charging, 15ms UPS, and a trolley are the praise; only two AC sockets, no expansion, and heavy weight are the caveats. [Elite 400 · 2 entries]
- A1
“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]
- A2
“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]
- A3
“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]
- A4
“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]
- B1
“BLUETTI's largest Elite-range unit — a 3,840Wh LiFePO4 battery with 2,600W continuous output (3,900W Power Lifting), fixed at native capacity with no expansion.”
techradar.com / amazon.com — Elite 400 review · 2026 · [mixed]
- B2
“Combines 3,840Wh LFP capacity, 3,900W surge, 70-minute fast charging, 15ms UPS protection, and a built-in trolley system — one of the most complete units at the 3,000Wh+ tier in 2026.”
backuppowerhub.com / cleantechnica.com — Elite 400 review · 2026 · [positive]
- B3
“A hefty ~86 lbs (39 kg), though reviewers note it's lighter than some competitors, with wheels and a trolley for mobility.”
notebookcheck.net / thesolarlab.com — Elite 400 review · 2026 · [mixed]
- B4
“Powerful, but reviewers flag only two AC sockets and no battery expansion as compromises — good but not quite as good as it could have been.”
techradar.com / edinburghnews.scotsman.com — Elite 400 review · 2026 · [mixed]
Research compiled July 16, 2026.
Who Should Buy Which
Buy the AC200MAX if you…
- →The frequent solo hauler: at 61.9 lb it's a single one-person lift, 23 lb lighter than the Elite, and if the unit moves between house, car, and campsite often, that gap is felt every trip.
- →The grow-into-it buyer: if you expect to cross 3,840Wh — a van build, partial home backup — the AC200MAX is the only unit here you can add more battery to.
- →The budget-first buyer: $500 less up front, and $300 per warranty year against the Elite's $340.
Buy the Elite 400 if you…
- →Anyone who wants the job finished in one box: 3,840Wh clears a weekend at 64% and an 8-hour blackout at 50%, where the AC200MAX runs out mid-weekend.
- →The bedside, CPAP, or home-office buyer: 30 dBA and a 15ms UPS keep it quiet and keep a desktop or CPAP alive through a grid blip.
- →The value buyer who runs the math: $0.44 per watt-hour beats the AC200MAX's $0.59, and the extra capacity costs $0.28 per watt-hour — the best-priced energy in the matchup.
If neither fits
If your daily draw is van-life-scale at about 4,685Wh, neither base unit covers it — look at a 5,000Wh-plus system, or commit to the AC200MAX plus a pricey expansion battery. And if you only ever run a CPAP and phones, both are overkill; a 1,000Wh unit saves you fifty pounds and several hundred dollars.
The Bottom Line
The Elite 400 is the buy for nearly everyone comparing these two. It finishes the weekend the AC200MAX runs out of, does it 20 dBA quieter, adds a 15ms UPS the older unit lacks, and — the part people miss — its extra 1,792Wh costs $0.28 per watt-hour, cheaper than the AC200MAX's own energy. Paying $500 more for the better-priced capacity isn't the splurge it looks like.
The AC200MAX keeps exactly two honest arguments: it's 23 lb lighter to carry, and it's the only one of the two you can grow past 3,840Wh. If you're a frequent solo hauler, or you know a van build or home-backup expansion is coming, take it and live with the louder fan. Everyone else: the Elite 400.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Is the Elite 400 worth $500 more than the AC200MAX?
For most buyers, yes. The $500 buys 1,792Wh more capacity at $0.28 per watt-hour, cheaper than the AC200MAX's own $0.59, plus a 15ms UPS, a 20 dBA quieter fan, and faster charging. The AC200MAX only pulls ahead if you need it lighter or plan to expand past 3,840Wh.
Can the AC200MAX run a full weekend of camping?
Not quite on its own. A typical weekend draws about 2,100Wh, and the AC200MAX holds 2,048Wh before you even subtract inverter losses, so you'd be rationing by Sunday. The Elite 400 covers the same weekend using 64% of its capacity.
Which one is quieter?
The Elite 400, by a wide margin. It's rated 30 dBA versus the AC200MAX's 50 dBA under load, which owners confirm runs loud. That 20 dBA gap is the difference between a fan you notice in a bedroom and one you don't.
Does either have UPS backup for a desktop or CPAP?
Only the Elite 400, with a 15ms switchover fast enough to keep a desktop or CPAP running through an outage. The AC200MAX has no true UPS mode, so anything that can't survive a brief blink will reboot when the grid drops.
Can I add more battery to either one later?
Only to the AC200MAX. It accepts BLUETTI expansion batteries to grow past its 2,048Wh base, while the Elite 400 is a sealed 3,840Wh unit with no expansion. If you might cross 3,840Wh someday, that's the AC200MAX's single strongest argument.
Where to buy
BLUETTI AC200MAX
$1,199.00
$1,199.00 list · direct from BLUETTI
BLUETTI Elite 400Pick
$1,399.00
$1,399.00 list · direct from BLUETTI
Prices may vary by retailer and are subject to change.