Head-to-head test
BLUETTI AC300 + 4ΓB300 vs BLUETTI Apex 300 + B500K
The smaller pack is rated to deliver more total energy than the big one, so the $2,297 premium on the AC300 + 4ΓB300 buys exactly one thing: a deeper single charge.
Full profiles: BLUETTI AC300 + 4ΓB300 β Β· BLUETTI Apex 300 + B500K β
Written by Gunner GustafsonUpdated
Whole-Home Backup Tester, Station Arena Test Desk
Spec deltas
The cheaper of these two is rated to last longer, hit harder, and deliver more energy over its life. The Apex 300 + B500K is $3,299 against the AC300 + 4ΓB300's $5,596, and the one column where the extra money shows up is how much the pack holds at any single moment: 12,288Wh against 7,885Wh.
Both are 2,400W-solar, UPS-capable, expandable BLUETTI boxes that live where you install them, so the usual portable-versus-portable questions never come up. Neither one is going camping. What you are choosing is how deep a single charge has to be, and whether that depth is worth more than a longer rated life, 840W more continuous output, less than half the weight, and the money.
Take the Apex. The exception is real and worth stating early: a full van-life day draws 4,685Wh, which is 45% of the AC300 stack and 70% of the Apex. If that is your load every day of the year, the bigger cushion is the thing you are actually buying, and it is the only scenario on this page where the premium earns out.
What the Numbers Reveal
Each conclusion stated first β the numbers behind it on one line, the full analysis below.
rated cycles
Price and delivered energy point at the same unit: seven cents per lifetime kilowatt-hour on the Apex against thirteen on the AC300 stack. Paying nearly twice as much per unit of energy for a pack that reaches its rated limit sooner is not a premium for capacity. It is a premium for having the capacity all at once.
AC300 + 4ΓB300: 12,288Wh Γ 3,500 rated cycles = 43,008 kWh across the rated lifeApex 300 + B500K: 7,885Wh Γ 6,000 rated cycles = 47,309 kWhthe Apex pairing costs $3,299 against the AC300 stack's $5,596
Why it mattersIf this is decade-scale house infrastructure rather than one big night, the Apex is the cheaper box twice over.
The AC300's cushion is a hedge against bad solar days, not against big loads. If you have 2,400W of panel and sun to point it at, the Apex replaces its deeper daily draw before lunch and the extra capacity never gets touched. If your roof carries a fraction of that, or you park in shade, the cushion is the only thing standing between you and a dead morning.
both units cap solar input at 2,400W12,288Wh against 7,885Wh of nameplate capacityVan Life Daily draws 4,685Wh, 45% of the AC300 stack and 70% of the Apex
Why it mattersFull-timers with an undersized or shaded array are the buyers the AC300's premium is genuinely for. Anyone with a real array should keep the money.
Idle draw is an annoyance you can switch off. The parts answer is not: it turns any hardware fault on a $5,596 purchase into a replacement decision rather than a repair billA9A10. The Apex's field record is thinnerB0, but it is a current product carrying the longer warranty term.
one reviewer measured the AC300's idle draw at close to 60W with AC output on and no loadA2, and watched it consume meaningful battery over four hours with nothing plugged inA3an owner's AC300 head unit failed outright, and BLUETTI's answer was that the AC300 is discontinued, the parts do not exist, and repair is not recommendedA9A10the AC300 + 4ΓB300 configuration costs $5,596
Why it mattersIf the plan is to wire this into the house and forget about it for a decade, the AC300 stack is the riskier half of that plan.
continuous output
These boxes live beside a breaker panel, not a picnic table, so the load that decides the purchase is a compressor or a pump, and the first half-second of a motor start is settled by absolute peak watts rather than watt-hours. The cheaper, lighter unit is also the one more likely to get the well pump spinning.
Apex 300 + B500K: 3,840W continuous, 7,680W surgeAC300 + 4ΓB300: 3,000W continuous, 6,000W surgeboth units are stationary installs rather than take-alongs
Why it mattersIf your backup list includes a pump, a shop compressor, or a window air conditioner, read the output column before the capacity column.
The specific dimensions that decide these two units β everything else is a tie.
Lifetime Value
Selected because: The cheaper unit is also the one rated to deliver more energy over its life, which settles most of this matchup before capacity comes up.
cost / lifetime kWh
Cycle life is doing the heavy lifting here, and doing it quietly, because the number that sells a power station is the Wh figure on the lid. The longer-lived pack turns out to be the smaller one, which inverts the whole shape of the decision: you are not choosing between more battery and less battery, you are choosing between more battery now and more energy overall.
One thing worth being precise about: at the rated cycle count neither pack is dead. It is down to roughly 80% of original capacity and still working. So this is not a cliff. It is a question of which unit is still holding most of what you paid for while the other has spent years shrinking.
Runtime: Will It Power Your Gear?
Selected because: The AC300 stack's one advantage is depth: 10,445Wh usable against 6,702Wh once the flat 85% derate is applied.
continuous output
Depth is the AC300 stack's argument and it is a real one: 10,445Wh of usable energy against 6,702Wh, using the flat 85% derate applied to every unit on this site. That is 3,743Wh of extra room, most of another full day's draw for someone living off it.
The catch is how seldom a single charge gets tested. A CPAP night is 320Wh. An eight-hour blackout with the fridge and the essentials is 1,645Wh. A remote workday is 910Wh. The Apex is not close to strained by any of them, and depth you never reach is money sitting in a box on your floor.
Growth Path
Selected because: Both take BLUETTI expansion batteries, so the capacity gap is a starting point rather than a ceiling.
Both units expand, which quietly guts the main reason to buy the bigger one today. If the Apex turns out to be tight in year two, you add a battery to it. Nobody has to buy four modules up front to hedge against a need they have not measured yet.
Buying capacity you might need is the most expensive way to be wrong about your own load. Run the Apex through a season, note what your worst day actually pulled, and let that number buy the next battery.
Your Life, Your Pick
Selected because: Five of the six loads we model are a wash or out of class for both units. Only a full van-life day separates them.
Run the six loads we model and the page mostly refuses to pick. Both units coast through a blackout, a CPAP night and a workday with the majority of the pack untouched, and both are the wrong shape for a campsite or a tailgate, where the problem was never watt-hours. It is getting the thing there.
Van Life Daily is where they separate, and it is the one place the premium does something: the AC300 stack ends the day with 5,760Wh still in hand against the Apex's 2,017Wh. If you live in the vehicle year-round and your panels are modest, that leftover is the product. If you are buying for a house that loses power four times a winter, it is a number you will never look at.
What the Specs Don't Tell You
Selected because: Weight, warranty term and rated switchover class all land on the Apex; the AC300 publishes no noise figure to compare at all.
rated cycles
Three of these cards are small, one-directional, and all leaning the same way: warranty term, rated switchover class, and what it takes to move the thing across a room. None of them would decide a purchase alone. Stacked on top of a lower price, they stop being tiebreakers and start being a pattern.
The honest gap runs the other way on noise. The Apex publishes a figure and the AC300 publishes nothing, which is not evidence about which fan is louder. It is an absence of evidence, and the published number is a manufacturer best case anyway. If this unit is going in a bedroom or an apartment, that is the one spec here you cannot settle from a spreadsheet, and reviewers who have actually heard these fans are worth more than either columnA5A6B1B2.
Strengths & trade-offs
BLUETTI AC300 + 4ΓB300
Strengths
- +Larger battery capacity
Trade-offs
- βSubstantially more expensive (+$2,297) than the Apex 300 + B500K.
- βSignificantly heavier (+184.2 lbs), making it harder to move.
- βWeaker inverter (-840W) limits appliance compatibility.
- βVery heavy unit that may be difficult for one person to lift.
- βShorter-lived battery β rated for 3,500 charge cycles vs the Apex 300 + B500K's 6,000, so it wears out sooner.
BLUETTI Apex 300 + B500K
Strengths
- +Costs $2,297 less
- +Lighter by 184.2 lb
- +Higher AC output
- +Longer warranty
- +Rated for 6,000 charge cycles β much longer battery lifespan
Trade-offs
- βVery 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 Β· 2 nights Β· needs 2,100Wh
Weekend Camping
Two nights off-grid with essential comfort
Neither unit
The 2,100Wh a weekend needs is nothing to either of these. Getting either of them to the campsite is everything. Both are installed appliances that happen to be unplugged, and even the lighter one takes two people and a tailgate to load. If the power has to travel, you are shopping the wrong class of product.
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
Either unit
Both walk through this with most of the pack untouched, so the outage itself is not the test. What separates them is the instant the grid drops: both list a UPS mode at different rated speeds, and those ratings are manufacturer ceilings rather than stopwatch results. If a blackout is the only reason you are shopping, both units do the job and the price decides it.
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 asks for about 40W, so both cover the night on a single-digit percentage of the pack and capacity decides nothing at all. What matters is the fan a forearm's length from your head at three in the morning, and only one of these units publishes a noise figure, which is itself a manufacturer best case rather than a measurement. Neither wins this on the numbers. The Apex at least gives you a number to be skeptical about.
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
Either unit
Both power your workstation all day without strain. The AC300 + 4ΓB300 lists 100W of USB-C for direct laptop charging; the Apex 300 + B500K carries no USB-C at all, so a laptop there goes through the inverter and you are carrying its brick.
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
Neither unit
Neither, and the watt-hours have nothing to do with it. A tailgate needs 670Wh and a 400W peak, which both units treat as a rounding error. The problem is that you would be wheeling a stationary battery across a parking lot to run a blender. Buy something a person can carry and keep these for the house.
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
AC300 + 4ΓB300
The AC300 stack takes this one, and on the right grounds: both finish the day, but only one finishes it with enough left to do tomorrow as well if the sun does not show up. A full day here uses under half of the bigger pack and most of the smaller one. If you live in the vehicle and your roof is modest, that leftover is the entire reason to spend more. If you are buying for a house, it is a cushion you will never watch.
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: AC300 + 4ΓB300 runs 51h vs 32.7h.
$5,596 list Β· direct from BLUETTI
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 0β696.3hComfort & Convenience
Makes off-grid life actually enjoyablescale 0β139.3hHigh-Draw Appliances
These reveal the real limitsscale 0β10.4hΒΉ 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
September 13, 2026
Verdict: the Apex 300 + B500K
Take the Apex 300 + B500K. It costs $3,299 against $5,596, weighs less than half as much, pushes 840W more continuous output, carries the longer warranty term and the tighter rated UPS class, and across its rated cycle life is expected to deliver more total energy than the physically larger AC300 stack. The AC300 + 4ΓB300 wins one thing that genuinely matters: 10,445Wh of usable capacity against 6,702Wh, which is the difference between 45% and 70% depth on a full van-life day. If that is your every day, buy it. If it is not, you are paying a premium for headroom you will reach a handful of times a year, on a head unit whose owners report BLUETTI no longer stocks repair partsA9A10.
Editor-assigned confidence, based on cited owner research and spec analysis.
List prices as of September 13, 2026. The links below open BLUETTI's current price.
$3,299.00 Β· direct from BLUETTI
Last checked 16 days ago. Prices move β check before you buy.
or check the AC300 + 4ΓB300 price$5,596.00 list
Written by Gunner Gustafson, Whole-Home Backup Tester Β· Station Arena Test Desk Β· Updated September 13, 2026
Black Friday Β· 38 days out
Prices to beat:AC300 + 4ΓB300 $5,596Apex 300 + B500K $3,299
We have never seen either discounted, so any real cut would be a first.
Measured Data
Benchmark scores and the full spec record, side by side.
Benchmark scores
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, AC300 + 4ΓB300 rates 3.3/5 (1st percentile of 29 Whole-Home / Off-Grid-class units), and Apex 300 + B500K rates 3.5/5 (11th percentile of 29 Whole-Home / Off-Grid-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.
Two People Either Way
Neither of these is grab-and-go, and the difference is what kind of project moving it becomes. At 183 lbs the Apex is a two-person lift with a clear path and a plan. At 367.2 lbs the AC300 stack is a decision about where it lives, made once, with a dolly. Work out the stairs before you work out the watt-hours.
Apex 300 + B500K: 45dB, and Only as a Best Case
45dB is the manufacturer's floor, the as-low-as figure, usually measured in a capped quiet mode. Under real load it will be louder. There is no published number for the AC300 + 4ΓB300 to compare it against, which is an absence of data rather than a point against it. If the unit shares a room with a sleeper, settle this one with your ears.
Apex 300 + B500K: Power Lifting to 7,680W
The Apex 300 + B500K has BLUETTI's Power Lifting mode, which runs a resistive appliance rated up to 7,680W from its 3,840W inverter. It does that by delivering less power than the appliance asks for, not more than the inverter has: the heater still works, it just heats more slowly. Two things follow. BLUETTI scopes the mode to purely resistive loads β a heater, a kettle, an incandescent lamp β so it does nothing for a fridge compressor, a pump or a power tool, and this record publishes no surge figure at all, so read the mode as a resistive-load feature rather than as starting ability. And it is not a reason to size down, because running a load that big from 7,885Wh is a short session either way. Genuinely useful if a heater or a kettle is why you're buying; beside the point otherwise. Our record for the AC300 + 4ΓB300 carries no Power Lifting figure, only a 6,000W surge peak, which is a different rating, so check BLUETTI's own spec sheet before reading this as something the AC300 + 4ΓB300 lacks.
UPS Switchover: β€10ms vs β€20ms
Both list a UPS mode, and both figures are manufacturer ceilings rather than switchover times anyone has clocked. The Apex holds the tighter rated class, which is the kind of margin that only matters when what you are protecting is a desktop with unsaved work. For a router, a modem and a fridge, either rating is fine.
Warranty: Register It the Week It Arrives
Five years on the Apex against four on the AC300 stack, and with BLUETTI the long term is the registered one. The generous coverage generally assumes you bought direct or filled in the registration, and buyers who skip it are left with the reseller term instead. Whichever unit you choose, register it immediately. It is the cheapest warranty you will ever add.
Battery Lifespan in Real Years
The Apex 300 + B500K is rated for 6,000 cycles vs 3,500. In real life: at daily use, that's 16.4 vs 9.6 years. At weekend use (twice a week), it's 58 vs 34 years. One caution reading years across different sizes: a cycle is 7,885Wh on the Apex 300 + B500K and 12,288Wh on the AC300 + 4ΓB300, so count lifetime energy β roughly 47,309 kWh against 43,008 kWh over the rated life. After hitting the cycle limit, the battery doesn't die β it drops to ~80% of original capacity, which is still very usable.
AC300 + 4ΓB300: Noise Level Not Disclosed
The Apex 300 + B500K publishes its noise level (45dB); the AC300 + 4ΓB300 doesn't publish one. That isn't evidence the AC300 + 4ΓB300 is louder β it means there's no figure to hold it to, and no way to compare the two on this without hearing them. If you're buying for a bedroom, a CPAP, or an apartment, treat the Apex 300 + B500K's 45dB as the only published number on the table β a spec-sheet figure, not a measurement β and look for hands-on reports of the AC300 + 4ΓB300 before deciding.
Full record above β the Test Desk pick is the Apex 300 + B500K.
Check Apex 300 + B500K price βor check the AC300 + 4ΓB300 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 Apex 300 + B500K wins on both sticker price and long-term value. At $0.07/kWh over its lifetime, it's meaningfully cheaper to own. Clear value winner.
Growth path
AC300 + 4ΓB300
EXPANDABLESupports BLUETTI expansion batteries, so you can add capacity later without replacing the base unit β useful if your needs may climb past 12,288Wh.
Accepts up to 2,400W 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 BLUETTI-specific. You're investing in the BLUETTI ecosystem.
Apex 300 + B500K
EXPANDABLESupports BLUETTI expansion batteries, so you can add capacity later without replacing the base unit β useful if your needs may climb past 7,885Wh.
Accepts up to 2,400W of solar. Enough for a serious multi-panel array.
Limited ports. You'll likely need a power strip or splitter.
Expansion batteries are BLUETTI-specific. You're investing in the BLUETTI ecosystem.
Realistic full solar rechargeat 70% of rated panel output β see methodology
Analyst note
Both expand, so neither locks you out of growth β decide on capacity, price, and the rest, not the expansion checkbox.
What Owners Report
Patterns from published owner reports and long-term reviews β every claim cited to its source below.
BLUETTI AC300 + 4ΓB300
The AC300 launched in 2021 and it shows in the record: professional reviews, long forum threads, specific complaintsA0. Build quality comes up positivelyA1. So does the fan, more than you would expect for a box this size. One owner running multiple AC300s reported no motor or bearing noise at all, only air movementA6, and a lab-test review called it audible but easy to forget aboutA5. The recurring gripe is idle appetite: close to 60W with the AC output on and nothing plugged inA2, enough to eat noticeable battery over an afternoon of standing byA3. The app is the other one, described as basicA7, with some owners unable to get it to connect at allA8.
The entry that should move a $5,596 decision is the newest and the worst. One owner's head unit died outright after years of service, and the answer from support was that the AC300 is discontinued, the repair parts are gone, and repair is not recommended once shipping is countedA9A10. One report is not a failure rate. It is a failure mode, and it is the one you cannot engineer around. A caution if you go reading other AC300 reviews alongside this page: some of them describe a single-module AC300, one putting the weight near 50 poundsA12, which is a different machine from the four-battery stack priced here.
βI was immediately impressed with the unit's quality, finish, and clever design.β
Sources
reviewed.com
BLUETTI Apex 300 + B500K
Limited field data, and not the ordinary kind of limited. Our research could not find a single owner report confirming this exact Apex 300 + B500K pairing, and found nothing describing six months or more of ownership in any configurationB0. Everything below describes an Apex 300, possibly with a different battery bolted to it, so read it as character rather than as specB0.
The character is consistent on cooling: independent reviewers describe the fans as even and quiet for this output class, quiet enough to sit near a workspaceB1B2B13. The recurring complaint is software rather than hardware. A firmware update left one unit stuck in Backup modeB7, an app update broke connection for anotherB8, and one owner hit an inverter error code right after updatingB9. Several of those threads end with the problem resolved after a later update or a support callB8B10. Owners running units in parallel report them charging at uneven rates and swapping unofficial workarounds for itB3B4, which matters if your plan is to keep stacking. One reviewer could barely move it and could not lift it onto a tableB11, which may be the most useful sentence in this ledger. And confirm the port list on the exact bundle you order: one review describes the Apex 300 as having little beyond its AC outlets and high-voltage connectors, with no native USB or DC portsB12, where the spec sheet for this pairing lists 100W USB-C, and we could not confirm which configuration that reviewer had in handB0.
βTurns out the Apex 300's noise control is on par with the quietest power stations on the market, like those on offer from EcoFlow and DJI.β
Sources
bluettipower.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
- Idle power draw is noticeably higher than expected and drains meaningful battery even with no connected load. [AC300 + 4ΓB300 Β· 2 entries]
- Reviewers and owners consistently describe the AC300's fan as audible under load but notably quiet for its size and class. [AC300 + 4ΓB300 Β· 2 entries]
- The companion app is described as basic/limited, and some owners report Bluetooth or app-pairing problems connecting to the AC300+B300. [AC300 + 4ΓB300 Β· 2 entries]
- After several years of service, some head units fail outright, and once discontinued Bluetti has no repair parts and does not recommend repairing out-of-warranty units. [AC300 + 4ΓB300 Β· 2 entries]
- Multiple independent reviewers describe the dual-fan cooling as noticeably quiet/even for a unit of this output class, even under load. [Apex 300 + B500K Β· 3 entries]
- Firmware and app updates have repeatedly caused mode-lock, download failures, or inverter error codes; several threads show the issue eventually resolved after further updates or support contact. [Apex 300 + B500K Β· 4 entries]
- When running multiple Apex 300 units or expansion batteries in parallel, owners report uneven charge rates between units, with community-devised (unofficial) workarounds needed to keep them in sync. [Apex 300 + B500K Β· 2 entries]
- The stripped-down, modular design draws criticism for real-world handling: extreme weight makes it hard to move, and lack of native USB/DC ports forces reliance on a separate paid hub accessory. [Apex 300 + B500K Β· 2 entries]
- A1
βI was immediately impressed with the unit's quality, finish, and clever design.β
Clean Energy Reviews Forum β "Bluetti Power Station Review (AC300) Off-grid Backup" (user Svarky) Β· 2023-07 Β· [positive]
- A2
βWhen the AC output is switched on, the idle power draw (with no load) appears to be close to 60W, which is high.β
Clean Energy Reviews Forum β "Bluetti Power Station Review (AC300) Off-grid Backup" (user Svarky) Β· 2023-10 Β· [negative]
- A3
βWhen left on for 4 hours with no load, it consumed around 8% of the battery, which was rather surprising.β
Clean Energy Reviews Forum β "Bluetti Power Station Review (AC300) Off-grid Backup" (user Svarky) Β· 2023-10 Β· [negative]
- A5
βThe AC300 + B300 has a little bit of noise coming from the fan. It's NOT silent. But considering the size and use case... you'll forget it's there.β
GreenCitizen β "Bluetti AC300 + B300 Power Station Review: Real-Life Lab Test Results" Β· 2025-01 Β· [positive]
- A6
βThe powered fans within my AC300 units are extremely quiet when running β no detectible motor or bearing noise; only air movement is slightly heard.β
DIY Solar Power Forum β "Fan noise level of Bluetti AC200MAX?" thread (AC300 owner's comparison reply) Β· unknown Β· [positive]
- A7
βThe companion app brings basic functionality to your fingertips but leaves you longing for more.β
GreenCitizen β "Bluetti AC300 + B300 Power Station Review: Real-Life Lab Test Results" Β· 2025-01 Β· [negative]
- A8
βApp (v3.0.1) keeps loading indefinitely even when the AC300 itself shows it is "Connected."β
BLUETTI Community forum β "AC300+B300 doesn't connect to Bluetti App" thread Β· unknown Β· [negative]
- A9
βI just had my AC300 head unit fail with a007 App error, and 00 006 and 01 006 errors on the console screen and 2 days later.... click click click.. DEAD.β
DIY Solar Power Forum β "Bluetti - Screw you - AC300 dead and no parts to fix it anymore 5 years after launch" Β· 2026-03 Β· [negative]
- A10
βDue to the AC300 being discontinued, they don't have the necessary parts for repairs. Considering the repair costs and round-trip shipping fees, we don't recommend repairing it.β
DIY Solar Power Forum β "Bluetti - Screw you - AC300 dead and no parts to fix it anymore 5 years after launch" (Bluetti support reply relayed by OP) Β· 2026-03 Β· [negative]
- A12
βWeighs close to 50 pounds, which is heavy if you plan to use it mainly as a portable power bank.β
Reviewed.com β "Bluetti AC300+B300 Home Battery Backup Review" Β· unknown Β· [negative]
- B1
βTurns out the Apex 300's noise control is on par with the quietest power stations on the market, like those on offer from EcoFlow and DJI.β
The Solar Lab β "Bluetti Apex 300 Review: Cheap, Practical Home Backup?" Β· unknown Β· [positive]
- B2
βSome units sound like small jet engines under load, but the Apex 300's fans are relatively tame.β
Techspective β "Bluetti Apex 300 with B300K Review" Β· 2025-09 Β· [positive]
- B3
βThe Apex 300 have some major charging problems... When the units are charging from the grid they charge at different rates and not together.β
DIY Solar Power Forum β "Bluetti Apex 300 problems" Β· 2025-09 Β· [negative]
- B4
βI have found a simple way to get around some of the solar charging limitations with multiple APEX 300s hooked up in parallel... So far, I have not had any problems with my setup.β
DIY Solar Power Forum β "Bluetti Apex 300 problems" Β· 2025-09 Β· [mixed]
- B7
βI updated my Apex 300 to the latest firmware yesterday. Now it's stuck in 'Backup' mode... when I go into the app to try to change it back, it flashes to...β
BLUETTI Community β "Apex 300 stuck in Backup mode after last firmware update" Β· 2025-11 Β· [negative]
- B8
βThere was an update on my Apex 300 a few days ago IOT v8026.12... Problem is every time I connect to the power st[ation]... Edit - This seems fixed now hooray!β
BLUETTI Community β "Check For Update App issue" Β· 2025-09 Β· [mixed]
- B9
βAfter the update completed, the charging stopped and I received Error 004... I have error E004 Inverter Output Failure.β
BLUETTI Community β "Error E004 Apex 300" Β· 2025-11 Β· [negative]
- B10
βI had a power outage in the middle of the night, so I hooked everything (Hub A1 and all 300's) back up and now HA is populating. YEA!!!β
GitHub bluetti-official/bluetti-home-assistant β "APEX 300 and Hub A1 now working" (Issue #95) Β· 2026-05 Β· [mixed]
- B11
βit's so heavy I can hardly carry it more than a few feet at a time and have been unable to lift it onto a table.β
T3 β "Bluetti Apex 300 review: transform your off-grid life" Β· 2025-11 Β· [negative]
- B12
βThe Apex 300 doesn't have USB ports, DC ports, or much of anything beyond its six AC plugs and high-voltage connectors.β
The Solar Lab β "Bluetti Apex 300 Review: Cheap, Practical Home Backup?" Β· unknown Β· [negative]
- B13
βFan noise remains even, with no distracting pitch or rattle. This makes the Apex 300 usable near sleeping areas or indoor workspaces without disturbance.β
Yanko Design β "BLUETTI Apex 300 Review" Β· 2025-05 Β· [positive]
Research compiled September 13, 2026.
Who Should Buy Which
Buy the AC300 + 4ΓB300 if youβ¦
- βYou live in the vehicle or the off-grid cabin year-round, a full day's draw is close to half this pack, and your roof carries well under the 2,400W the unit can accept. The cushion is what you are paying for, and it is worth it.
- βYou want the deepest single charge BLUETTI sells in this class today, you would rather not add batteries later, and you have priced in that owners report no repair parts left for the head unitA9A10.
Buy the Apex 300 + B500K if youβ¦
- βYou are backing up a house: fridge, freezer, internet, a few lamps, four times a winter. Both units walk through that, so buy the one that costs less and is rated to keep doing it longer.
- βYou want the stronger inverter. The Apex is the higher-output unit of the two, and motor starts are decided by peak watts rather than capacity.
- βYou expect your needs to grow and would rather buy the extra battery once you can measure the need instead of guessing at it now.
- βYou are the one who has to move it. It is still a two-person lift, but it is half the mass to get through a basement doorway, and it is two pieces rather than five.
If neither fits
If any part of your plan involves the unit leaving the building, close this tab. Both of these are installed, not carried, and a camping weekend's 2,100Wh is a job for something one person can pick up with one hand on a handle. Same verdict if your real need is a CPAP and a phone charger: a night uses 5% of the Apex's usable pack, and nobody should spend this much to use a twentieth of it. Look at a mid-size portable instead, and spend the difference on a second one so you have a spare.
The Bottom Line
Buy the Apex 300 + B500K. The longer rated cycle life turns the smaller pack into the larger lifetime supply, and it arrives with more output, a longer warranty term, a tighter rated switchover class, half the mass, and $2,297 still in your account. Nothing on the AC300 stack's side of the table closes a gap that wide, because the gap is not a feature. It is arithmetic.
The one honest exception stays on the table. If a full day's draw is the van-life number and your panels are marginal, the AC300 stack's leftover cushion is the product, and that buyer should pay the premium without regret. Everyone else is buying depth they will reach a few times a year, on a head unit whose parts situation is already a forum threadA9A10. Keep the money, register the Apex the week it lands so the longer warranty term is actually yours, and put the difference toward the battery you will buy when you know you need it.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Is the Apex 300 + B500K big enough, or do I need the AC300 with four B300s?
For house backup the Apex is big enough with a wide margin: our eight-hour blackout model finishes with 5,057Wh of its usable pack untouched. The AC300 stack only pulls ahead when you are drawing thousands of watt-hours every single day, which in practice means full-time off-grid living rather than emergencies. Buy the depth when you have measured the need, not before.
Is the BLUETTI AC300 discontinued?
Owners report being told exactly that. One owner whose head unit failed was told by BLUETTI support that the AC300 is discontinued, that the repair parts are not available, and that repair was not recommended once round-trip shipping was counted. Treat that as one owner's account of one support conversation rather than a company statement, but factor it into a $5,596 purchase you expect to keep for a decade.
Which one is quieter for a bedroom or a CPAP?
Neither spec sheet can answer that. The Apex publishes a noise figure and the AC300 publishes none, and the Apex's number is a manufacturer best case rather than a measurement under load. Reviewers have described both fans as restrained for their size. If the unit sleeps in the room with you, find hands-on video of the exact configuration before you commit.
Can I use either one as a UPS for a desktop PC?
Both list a UPS mode. The Apex is rated no worse than 10ms and the AC300 no worse than 20ms, and both of those are manufacturer ceilings rather than measured switchover times. Routers, modems and most modern PC supplies ride through either rating. If what you are protecting is a desktop with unsaved work, the Apex's rated class leaves more room before it becomes your problem.
Does the Apex 300 + B500K expand if I outgrow it?
Yes. Both units accept BLUETTI expansion batteries, so neither locks you into today's capacity. That is what makes the Apex the lower-risk buy: start with the smaller pack, watch what your worst week actually draws, and add a battery when you have a real number instead of paying the premium up front for a guess.
Where to buy
BLUETTI AC300 + 4ΓB300
$5,596.00
$5,596.00 Β· direct from BLUETTI
Last checked 16 days ago. Prices move β check before you buy.
BLUETTI Apex 300 + B500KPick
$3,299.00
$3,299.00 Β· direct from BLUETTI
Last checked 16 days ago. Prices move β check before you buy.
Prices may vary by retailer and are subject to change.