Head-to-head test
BLUETTI AC500 + 2×B300K vs BLUETTI Apex 300 + 2×B500K
BLUETTI AC500 + 2×B300K vs BLUETTI Apex 300 + 2×B500K: Buy the Apex 300 + 2×B500K unless you have a load above 3,840 watts. It holds 13,005 watt-hours to the AC500 stack's 5,530, costs less per watt-hour to buy and less per lifetime kilowatt-hour to own, and wins or ties every scenario the engine runs.
Full profiles: BLUETTI AC500 + 2×B300K → · BLUETTI Apex 300 + 2×B500K →
Written by Gunner GustafsonUpdated
Whole-Home Backup Tester, Station Arena Test Desk
Spec deltas
Two BLUETTI stacks that split the job cleanly. The AC500 + 2×B300K is the muscle, and the Apex 300 + 2×B500K is the tank. One pushes more watts out the front; the other holds more than twice the energy behind it, for less money per unit stored. For a box this size, the energy is usually what runs out first.
The Apex stack is the better buy for nearly everyone here, and the reason is unglamorous: it's cheaper for the thing you actually consume. Its capacity costs less per watt-hour today and less per kilowatt-hour across a 3,500-cycle life, and it wins or ties every real-world load the engine models. The AC500's whole case rests on a single spec: its 5,000-watt inverter starts things the Apex can't. If you can name the appliance that needs it, that spec is the entire reason to buy the AC500. If you can't, you're paying more for a smaller battery.
One thing neither stack does is travel. At 196 and 282 pounds these are furniture, not gear. You pick a corner of the house and they live there. Read every 'camping' or 'tailgate' framing below as a category error, and spend your attention on the questions that actually differ: how much energy, how much inverter, and how much money.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
Typical price
That makes the bigger unit the cheaper one on every money axis that matters: less per watt-hour to buy, and less per kilowatt-hour to own across the same 3,500-cycle life.
Apex 300 + 2×B500K: $5,399 for 13,005 WhAC500 + 2×B300K: $3,948 for 5,530 Whcost per watt-hour: $0.42 (Apex) vs $0.71 (AC500)
Why it mattersIf the AC500's lower sticker price is what's drawing you, run the math first, because you'd be paying more for each unit of the energy you actually use.
continuous output
The AC500's extra muscle only cashes in above 3,840 watts of simultaneous draw, a well pump, a central-AC compressor, a hard-starting motor. Under that line, which covers essentially every backup and off-grid load people actually list, the two inverters behave identically and only stored capacity separates them.
AC500 + 2×B300K inverter: 5,000W continuous, 10,000W surgeApex 300 + 2×B500K inverter: 3,840W continuous, 7,680W surgeheaviest modeled peak draw across all six scenarios: 400W, which both units start and sustain
Why it mattersBuy the AC500 only if you can name the appliance that needs more than 3,840 watts. If you can't, the output headroom is money spent on a spec you'll never reach.
A 16-Wh margin is no margin. One cloudy solar day or one heavier-than-usual evening and the AC500 goes dark, while the Apex sitting at 42% still has more than a full extra day in reserve.
Van Life Daily needs 4,685 WhAC500 + 2×B300K usable energy: 4,701 Wh, after the flat 85% derateApex 300 + 2×B500K finishes that same day at 42% used
Why it mattersFull-time van, RV, or off-grid buyers should read the AC500's van-life 'pass' as a fail with rounding and take the Apex for the cushion.
The specific dimensions that decide these two units — everything else is a tie.
Lifetime Value
Selected because: The bigger unit is also the cheaper one to buy and to own per unit of energy, which is the clearest signal in the matchup.
cost / lifetime kWh
Same cells, same 3,500-cycle rating, and yet the bigger unit is the cheaper one. That's the detail that should stop you. The Apex stack stores energy at $0.42 a watt-hour against the AC500 stack's $0.71, and spread across a full cycle life that comes to $0.12 per kilowatt-hour delivered versus $0.20.
Buying the larger battery doesn't just get you more capacity; it lowers your cost per unit of the exact thing you're paying for. That's backwards from how price usually works, and it's the single strongest reason the Apex is the default pick here.
Runtime: Will It Power Your Gear?
Selected because: Stored capacity is the axis that actually separates these two, and it isn't close.
continuous output
After the flat 85% derate everyone should apply for conversion losses, the Apex stack gives you 11,054 usable watt-hours to the AC500 stack's 4,701. You could drain the AC500 completely, twice over, and still not reach what the Apex keeps in reserve.
For a unit that sits in one place and exists to ride out long events, stored energy is the spec you feel every single day. This is a well-over-double lead, and nothing else in the matchup is nearly this lopsided.
PowerScore Breakdown
Selected because: The headline score favors the Apex on capacity, but it buries the AC500's real edge in throughput and would steer a big-appliance buyer wrong.
overall power score
Our composite score puts the Apex stack at 9,621 to the AC500 stack's 5,894, but that lead is almost entirely capacity, the one contest the AC500 was never entered in. Weigh throughput instead and the order flips.
The AC500 pushes more watts out, and it also pulls in more solar: 3,000 watts to the Apex's 2,400, so the smaller battery refills from panels faster on top of everything. If your limiting factor is how fast power moves, a hungry appliance at one end or a short solar window at the other, the higher score is steering you wrong. If your limiting factor is how much you can store, it's steering you right.
Your Life, Your Pick
Selected because: The modeled loads show the split plainly: the Apex takes every scenario where capacity matters, and both are too heavy for the ones that involve leaving the house.
Run the six modeled loads and the pattern falls out fast. Two of them, the campsite and the tailgate, the engine won't score at all, because neither of these units is going to a campsite or a tailgate. Of the four that stay home, the Apex takes the three where capacity does any work and ties the one where it doesn't, since a 40-watt CPAP is indifferent to which of these it's plugged into.
There's no scenario the AC500 wins on runtime, and there can't be: it brought less than half the battery to the fight. Where the two separate is exactly where you'd expect, on the long nights and the heavy days.
Strengths & trade-offs
BLUETTI AC500 + 2×B300K
Strengths
- +Costs $1,451 less
- +Lighter by 86.1 lb
- +Higher AC output
- +Faster solar charging
Trade-offs
- –Very heavy unit that may be difficult for one person to lift.
- –Shorter-lived battery — rated for 3,500 charge cycles vs the Apex 300 + 2×B500K's 6,000, so it wears out sooner.
BLUETTI Apex 300 + 2×B500K
Strengths
- +Larger battery capacity
- +Longer warranty
- +Rated for 6,000 charge cycles — much longer battery lifespan
Trade-offs
- –Substantially more expensive (+$1,451) than the AC500 + 2×B300K.
- –Significantly heavier (+86.1 lbs), making it harder to move.
- –Weaker inverter (-1,160W) limits appliance compatibility.
- –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
Neither unit
Both units clear the 2,100 watt-hours here without noticing, the AC500 stack at 45% used and the Apex at 19%. But capacity was never the question at a campsite. Neither of these is something you carry anywhere; they're built to sit in a utility room. If your power needs to leave the driveway, you're looking at the wrong class of machine.
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
Apex 300 + 2×B500K
Both ride out a single eight-hour night easily, so the real question is what happens if the outage runs into a second or third day. The Apex stack ends the night at 15% used, with five or six more nights like it in the tank. The AC500 stack ends at 35%, with under two. If your outages tend to run long, that gap is the whole decision.
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
A CPAP is about 40W for eight hours, so both of these cover the night several times over — capacity isn't the question here. What would separate them is fan noise, but AC500 + 2×B300K doesn't publish a figure, so there's nothing to hold it to. Buy on price, weight, and whether you can live with a fan you haven't heard.
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
Apex 300 + 2×B500K
The Apex 300 + 2×B500K clears the workday at 8% used, banking 10,144Wh — late work, extra calls, or a second laptop charge without arithmetic. The AC500 + 2×B300K at 19% also finishes, with 3,791Wh of slack for the unplanned.
Battery budget usedlower = more headroom
LOAD Laptop 60W×8h · External Monitor 30W×8h · Router + Modem 20W×8h · Phone Charger 15W×2h
SCN-05 · 4 hours · needs 670Wh
Tailgate Party
Game day power for the crew
Neither unit
Scoring these two at a tailgate is a category error: neither travels — the AC500 + 2×B300K is 196.1 lbs and the Apex 300 + 2×B500K 282.2 lbs, and at those weights they roll off a truck bed if they go anywhere at all. The 670Wh here is trivial for either — it's the going that doesn't happen. If you need power away from the building, you're shopping the wrong class.
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
Apex 300 + 2×B500K
For full-time living, the Apex 300 stack is the one that lets you stop doing math. A heavy day pulls it to 42% and leaves more than a full extra day's worth of power in reserve, so a cloudy solar day is a shrug rather than a crisis. The AC500 stack technically makes it through the same day, but finishes essentially empty, which turns one bad solar day into a cold start.
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: Apex 300 + 2×B500K runs 53.9h vs 22.9h.
$5,399 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 0–736.9hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–147.4hHigh-Draw Appliances
These reveal the real limitsscale 0–11.1h¹ 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
August 30, 2026
Verdict: the BLUETTI Apex 300 + 2×B500K
Buy the Apex 300 + 2×B500K unless you have a load above 3,840 watts. It holds 13,005 watt-hours to the AC500 stack's 5,530, costs less per watt-hour to buy and less per lifetime kilowatt-hour to own, and wins or ties every scenario the engine runs. The AC500 + 2×B300K counters with one real advantage: a 5,000-watt inverter and 10,000-watt surge that start heavy motor loads the Apex can't. That edge is decisive if you need it and irrelevant if you don't, so this is a question about your loads, not a close call on value.
Today the AC500 + 2×B300K is $3,299, $649 under its typical $3,948. The verdict weighs typical prices, not today's. Prices checked 16 days ago.
Editor-assigned confidence, based on cited owner research and spec analysis.
List prices as of August 30, 2026. The links below open BLUETTI's current price.
$5,399.00 · direct from BLUETTI
Last checked 16 days ago. Prices move — check before you buy.
or check the AC500 + 2×B300K price$3,299.00 list
Written by Gunner Gustafson, Whole-Home Backup Tester · Station Arena Test Desk · Updated August 30, 2026
Black Friday · 38 days out
Prices to beat:AC500 + 2×B300K $3,299Apex 300 + 2×B500K $4,999
The lowest we have recorded for each. A Black Friday price above it is a sale that unit has already had.
Measured Data
Benchmark scores and the full spec record, side by side.
Benchmark scores
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, AC500 + 2×B300K rates 4.1/5 (47th percentile of 20 Home Backup-class units), and Apex 300 + 2×B500K rates 3.5/5 (14th percentile of 29 Whole-Home / Off-Grid-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.
The 86-Pound Gap Is the Least Important Number Here
Yes, the AC500 stack is the lighter of the two, by 86 pounds. It won't matter. Both are two-person lifts that go into a room and stay there, and the lighter one is still not something you move on a whim. Plan the spot once, round up a second set of hands for setup day, and then never think about the weight again. Where these live, they live.
Apex 300 + 2×B500K: 45dB Published
45dB is about as loud as a running refrigerator. It is BLUETTI's own rating rather than a reading on a shared bench — makers differ on whether they quote a best case or a figure under load, so treat it as a starting point rather than what you would hear at a bedside. For most people, fan noise around 45dB and up is where sleep starts to suffer.
Power Lifting: 6,000W and 7,680W
Both units have BLUETTI's Power Lifting mode: the AC500 + 2×B300K to 6,000W on a 5,000W inverter, the Apex 300 + 2×B500K to 7,680W on 3,840W. It works by delivering less power than the appliance asks for rather than more than the inverter has, so the appliance runs slower rather than not at all. BLUETTI scopes the mode to purely resistive loads — a heater, a kettle, an incandescent lamp — so it does nothing for a fridge compressor, a pump or a power tool. Surge is a separate figure: the AC500 + 2×B300K publishes a 10,000W surge peak, the figure a motor's switch-on draw meets, and the Apex 300 + 2×B500K's record carries none. Neither Lifting figure speaks to motor loads. Judge the Lifting figures on which ceiling covers the resistive load you actually own.
UPS Switchover: ≤10ms vs ≤20ms
Both list a UPS mode, at different rated speeds. The Apex 300 + 2×B500K is rated ≤10ms — quick enough on paper that desktop PCs and routers should ride through, treating that as the rating it is. The AC500 + 2×B300K is rated ≤20ms — fine on paper for routers and most electronics; the fussiest PC power supplies sit right at this line. If a computer with unsaved work is the thing being protected, the stated class is worth the attention; nothing here is a lab result.
Warranty: 5 Years vs 4
The Apex 300 + 2×B500K is covered for 5 years against the AC500 + 2×B300K's 4 years. The Apex 300 + 2×B500K's figure is a maximum rather than a guarantee — it depends on buying direct from BLUETTI or registering the unit, since reseller purchases carry a shorter term. An underrated factor if you're keeping this unit for years.
Battery Lifespan in Real Years
The Apex 300 + 2×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 13,005Wh on the Apex 300 + 2×B500K and 5,530Wh on the AC500 + 2×B300K, so count lifetime energy — roughly 78,029 kWh against 19,355 kWh over the rated life. After hitting the cycle limit, the battery doesn't die — it drops to ~80% of original capacity, which is still very usable.
AC500 + 2×B300K: Noise Level Not Disclosed
The Apex 300 + 2×B500K publishes its noise level (45dB); the AC500 + 2×B300K doesn't publish one. That isn't evidence the AC500 + 2×B300K is louder — 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 + 2×B500K's 45dB as the only published number on the table — a spec-sheet figure, not a measurement — and look for hands-on reports of the AC500 + 2×B300K before deciding.
Full record above — the Test Desk pick is the Apex 300 + 2×B500K.
Check Apex 300 + 2×B500K price →or check the AC500 + 2×B300K 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 AC500 + 2×B300K is cheaper to buy, but the Apex 300 + 2×B500K is cheaper to own. At $0.07/kWh over its lifetime vs $0.20/kWh, the Apex 300 + 2×B500K's higher cycle life and capacity make each dollar go further over the years.
Delivers each lifetime kWh for $0.13 less — check the Apex 300 + 2×B500K price →
Growth path
AC500 + 2×B300K
EXPANDABLESupports BLUETTI expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 5,530Wh.
Accepts up to 3,000W of solar. Enough for a serious multi-panel array.
Adequate ports for most setups, but heavy users may want a power strip.
Expansion batteries are BLUETTI-specific. You're investing in the BLUETTI ecosystem.
Apex 300 + 2×B500K
EXPANDABLESupports BLUETTI expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 13,005Wh.
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 — see methodology
Analyst note
Both expand, so neither locks you out of growth — decide on capacity, price, and the rest, not the expansion checkbox.
What Owners Report
Patterns from published owner reports and long-term reviews — every claim cited to its source below.
BLUETTI AC500 + 2×B300K
Field reports on the AC500 skew positive on daily use. One owner found it noticeably quieter than the unit it replacedA1, and another called it near-flawless from day one, with an easy setup and a clean monitoring appA12A9. Fan behavior is the small caveat: it can spin up loudly during heavy charging, though not constantlyA10.
The recurring complaints cluster at the start of ownership, not during it. One review had the inverter arrive deadA7; another owner's stack shipped without the cable that links the battery to the inverterA6; and there's no hard-reset button to recover from a glitchA8. Quality-of-life gripes round it out: the display shows battery percentage but no time-remaining or voltageA2, and the indicator lights are bright and always on, so reviewers steer you away from putting it in a bedroomA11. One owner happily ran it as a whole-home UPS drawing about 31 wattsA5.
Worth knowing: none of this comes from the exact two-battery stack on this page. Every report describes the AC500 with a single B300K, the same inverter and the same battery model wired one-to-one instead of one-to-twoA0, so the hardware, app, and fan-noise notes carry over even though the runtime figures need doubling.
“So far pretty darn happy, and it's much quieter than the small Pecron E1500LFP I have.”
Sources
firewoodhoardersclub.com · thesolarlab.com · freshlycharged.com · diysolarforum.com
BLUETTI Apex 300 + 2×B500K
Genuine field data on the Apex 300 with the B500K battery is thin. This is a recent, niche configuration, and only one real owner post names the exact pairing, from someone running it on a 50-amp fifth-wheel RVB10. Most hands-on coverage tests the Apex 300 with the older B300K battery, so it's worth reading for character rather than specB0.
What comes through consistently is the physical reality and the port layout. The weight is punishing: one reviewer couldn't lift it onto a tableB4, and there are no wheels, so plan on a cartB11. The bigger design knock is that the Apex's face carries no built-in USB or DC outputs, so getting them means bolting on the roughly $300 Hub D1 accessoryB2B6. The app works but trails EcoFlow's and Anker's for polishB3, and the fans are reported as fairly restrained under loadB1.
“Some units sound like small jet engines under load, but the Apex 300's fans are relatively tame.”
Sources
techspective.net · thesolarlab.com · t3.com · trustedreviews.com · notebookcheck.net · 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
- Multiple sources report AC500 units arriving with hardware faults — a dead inverter or a missing battery-link cable — that required contacting Bluetti support. [AC500 + 2×B300K · 2 entries]
- Fan noise is intermittent but noticeable during charging/heavy load across sources, though one owner found it quieter than a competing unit. [AC500 + 2×B300K · 2 entries]
- The app covers the basics but owners want more detail (time-remaining, battery voltage), and the unit lacks a hard-reset option to recover from glitches. [AC500 + 2×B300K · 2 entries]
- Reviewers consistently note the lack of built-in USB/DC ports, requiring a separate $300 Hub D1 accessory, as a notable and costly design compromise. [Apex 300 + 2×B500K · 3 entries]
- The unit's extreme weight (~85 lbs base, more with expansion batteries) makes it effectively immobile once placed, despite being marketed as 'portable.' [Apex 300 + 2×B500K · 3 entries]
- The modular ecosystem (Hub A1, Hub D1, expansion batteries) is praised for flexibility but criticized for high add-on costs relative to competitors. [Apex 300 + 2×B500K · 3 entries]
- A1
“So far pretty darn happy, and it's much quieter than the small Pecron E1500LFP I have.”
firewoodhoardersclub.com — jtakeman, "Bluetti AC500 w/B300K battery for our home backup/supplement system install and review" · 2025-02 · [positive]
- A2
“One other odd thing — it doesn't have a time-of-charge-remaining readout like my EF or Pecron units, just battery percentage. They don't even display battery voltage.”
firewoodhoardersclub.com — jtakeman, AC500 w/B300K install and review thread · 2025-02 · [negative]
- A5
“Using about 31 watts an hour as a UPS — at 85% that should last about 8+ hours. Priceless!!”
firewoodhoardersclub.com — jtakeman, AC500 w/B300K install and review thread · 2025-03 · [positive]
- A6
“Got a hold of Bluetti support — seems they forgot to ship the cable connecting the main unit to the battery.”
firewoodhoardersclub.com — jtakeman, AC500 w/B300K install and review thread · 2025-02 · [negative]
- A7
“Both the AC300 and AC500 we tested had issues where the battery would turn on but not the inverter itself — dead on arrival, essentially.”
thesolarlab.com — Bluetti AC500 Review: Pros, Cons & the Ugly Truth · unknown · [negative]
- A8
“The lack of a hard reset button on these units is also really frustrating.”
thesolarlab.com — Bluetti AC500 Review: Pros, Cons & the Ugly Truth · unknown · [negative]
- A9
“The accompanying app is decent, plainly presenting all of the basic information.”
thesolarlab.com — Bluetti AC500 Review: Pros, Cons & the Ugly Truth · unknown · [positive]
- A10
“The fan can get loud, though it's only intermittent and doesn't run constantly.”
freshlycharged.com — Powering A Room with Solar: Bluetti AC500 & B300K Review · unknown · [mixed]
- A11
“The indicator lights are quite bright and remain on all the time, so it's best not to keep the AC500 in a room where you'll be sleeping.”
freshlycharged.com — Powering A Room with Solar: Bluetti AC500 & B300K Review · unknown · [negative]
- A12
“Performed near flawlessly from day one, with easy-to-understand setup and a nice app for monitoring.”
diysolarforum.com — "Bluetti ac 500" owner thread · unknown · [positive]
- B1
“Some units sound like small jet engines under load, but the Apex 300's fans are relatively tame.”
techspective.net — Bluetti Apex 300 with B300K Review · 2025-09 · [positive]
- B2
“Not having DC or USB ports on the face is a tradeoff. The Hub D1 solves the problem—but it's an additional $300 accessory that you then have to bolt on after the fact.”
techspective.net — Bluetti Apex 300 with B300K Review · 2025-09 · [negative]
- B3
“The Bluetti app is still a little sluggish compared to the EcoFlow or Anker apps, but it lets you toggle power modes, monitor stats, and tweak settings from a distance.”
thesolarlab.com — Bluetti Apex 300 Review · unknown · [mixed]
- B4
“In fact, it'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”
t3.com — Bluetti Apex 300 review · 2025-11 · [negative]
- B6
“That Bluetti D1 Power Hub that gives you your DC and USB ports costs about $300, which is a steep price for what you're getting.”
thesolarlab.com — Bluetti Apex 300 Review · unknown · [negative]
- B10
“I recently purchased a Bluetti Apex 300 with a B500K expansion battery to help power our 50A Brinkley 5th wheel.”
BLUETTI Community forum — 'Apex 300 operating mode and settings?' · 2026-02 · [positive]
- B11
“No wheels though, so if you plan on moving it regularly, invest in a cart.”
thesolarlab.com — Bluetti Apex 300 Review · unknown · [negative]
Research compiled August 30, 2026.
Who Should Buy Which
Buy the AC500 + 2×B300K if you…
- →You have a specific heavy load a smaller inverter won't start: a well pump, central AC, an electric range, or hard-running shop tools. The AC500's 5,000-watt inverter and 10,000-watt surge exist for exactly this, and the Apex can't match them.
- →You want the faster solar recharge and the lighter of the two boxes, and you don't need a five-figure watt-hour reserve sitting in the garage.
- →You'd rather not buy an accessory hub to get USB and DC ports. The AC500 has them built in, where the Apex needs the add-onB2B6.
Buy the Apex 300 + 2×B500K if you…
- →You're backing up a house through outages that can stretch into a second or third day, and you want to stop rationing after the first evening.
- →You live in a van, RV, or off-grid setup full time and need a daily buffer that forgives a cloudy solar day instead of ending the day at empty.
- →Your loads stay under roughly 3,840 watts, which covers essentially all household electronics, refrigerators, and small appliances, and you'd rather spend the money on hours than on inverter headroom you won't use.
- →You want the most stored energy per dollar in the pair, plus a published warranty term (up to 5 years with registration) behind a box you'll lean on during emergencies.
If neither fits
Anyone who needs power that moves. Both are stationary systems that weigh as much as a second adult and are built to live in one room; for camping, tailgating, or job sites, buy a unit you can actually carry and save thousands. And anyone whose real need is riding out a short outage or keeping a phone, a router, and a light going: this is home-backup iron measured in the thousands of watt-hours, and you'd be overspending by an order of magnitude. A mid-size portable does that job for a fraction of the price.
The Bottom Line
The Apex 300 + 2×B500K is the buy for almost everyone here, and the reason is refreshingly boring. Same brand, same cells, more than twice the energy, and a lower cost both to buy per watt-hour and to own per kilowatt-hour. It also wins every modeled load where capacity does any work. You get more of what you came for and pay less per unit of it.
The AC500 + 2×B300K has exactly one job it does better, and it does that job alone: starting a load past the Apex's output ceiling. A well pump, a big compressor, a motor that surges hard on startup. For those, its larger inverter isn't a nicety, it's the only one of the two that works. Everyone else is buying watts they'll never pull and giving up more than half the available energy to get them. Name the appliance, or buy the Apex.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
What's the actual difference between the AC500 and the Apex 300 in this comparison?
It comes down to flow versus volume. The AC500 + 2×B300K has the stronger inverter at 5,000 watts continuous, so it starts and runs heavier appliances. The Apex 300 + 2×B500K stores far more energy, 13,005 watt-hours to 5,530, and at a lower price per watt-hour. Choose the AC500 for big loads and the Apex for long ones.
Can the Apex 300 stack run a well pump or central air conditioner?
Only if the appliance stays under its ceiling of 3,840 watts continuous and 7,680 watts of surge. Many well pumps and AC compressors spike well above their running wattage the instant they start, which is where the AC500 stack's 10,000-watt surge earns its price. Check your appliance's starting surge, not just its running draw, before deciding.
Is the Apex 300 stack worth the extra money over the AC500 stack?
For storage, yes, decisively. The extra capacity you're buying costs less per watt-hour than the AC500's own average, and the Apex works out cheaper per kilowatt-hour delivered over its cycle life. For raw output, no, because you'd be paying more for a smaller inverter. It's worth it if you want energy, not if you want watts.
Are these two portable at all?
No. The lighter of the two still takes two people to lift safely, and the Apex is heavier again, with no wheels. Both are install-it-and-leave-it machines meant for a utility room or garage. If you need power that travels, you're shopping the wrong category.
Does the Apex 300 have USB and DC ports built in?
Not on the unit itself. Reviewers note the Apex 300's face gives you AC outlets, and you add the roughly $300 Hub D1 accessory to get built-in USB and DC outputs. The AC500 has its DC and USB ports on board. If you run a lot of gear straight off USB or DC, fold that add-on cost into the Apex's real price.
Where to buy
BLUETTI AC500 + 2×B300K
$3,299.00
$3,299.00 · direct from BLUETTI
down from $3,948 · 16% below usual
Last checked 16 days ago. Prices move — check before you buy.
BLUETTI Apex 300 + 2×B500KPick
$5,399.00
$5,399.00 · direct from BLUETTI
Last checked 16 days ago. Prices move — check before you buy.
Prices may vary by retailer and are subject to change.