Head-to-head test
BLUETTI AC300 + 4×B300 vs BLUETTI Apex 300 + 2×B500K
Real-world runtimes, scenario verdicts, and ownership costs compared — which wins for your use case.
Written by Gunner GustafsonUpdated
Whole-Home Backup Tester, Station Arena Test Desk
BLUETTI
AC300 + 4×B300
9,180Power Score · The AC & Fridge Zone
$5,596.00 list · direct from BLUETTI
BLUETTI
Apex 300 + 2×B500K
10,032Power Score · Whole-Home Capable
$5,690.00 list · direct from BLUETTI
Spec deltas
Both carry the BLUETTI name, but they're built for different buyers. The AC300 + 4×B300 (12,288Wh, 3,000W) and the Apex 300 + 2×B500K (13,005Wh, 3,840W) come from different product lines with different engineering priorities. We'd buy the Apex 300 + 2×B500K.
What the spec gap means in practice: the Apex 300 + 2×B500K's 3,840W inverter can run a window AC unit, a full-size fridge, or power tools. The AC300 + 4×B300's 3,000W inverter will flat-out refuse to start those appliances. On stamina, the Apex 300 + 2×B500K keeps a fridge alive for roughly 74 hours vs the AC300 + 4×B300's 70 hours. The cost? Portability. At 367.2 lbs, the AC300 + 4×B300 is a two-person lift you set down once and leave. The Apex 300 + 2×B500K at 282.2 lbs is more manageable, though still not light.
Pick the Apex 300 + 2×B500K if you want maximum capability and room to grow. Go with the AC300 + 4×B300 if you need the heavier-duty specs for demanding loads. Most buyers overlook this: the AC300 + 4×B300 costs ~$0.13/kWh over its full lifespan, which adds up significantly over years of regular use. Keep scrolling for the full breakdown. The scenario verdicts below hold a few surprises.
Bench Notes
What each unit does well, where it falls short, and the trade-offs that matter.
BLUETTI AC300 + 4×B300
With a massive 3,000W output (and 6,000W surge), the AC300 + 4×B300 can run high-wattage appliances like space heaters, hair dryers, and electric grills without tripping. Weighing in at 367.2 lbs, this is not a unit you want to carry far. It's best suited as a stationary backup or RV companion. A standout feature is the value proposition: at roughly $0.46 per watt-hour, it's one of the most cost-effective options on the market.
Strengths
- +Costs $94 less
Trade-offs
- –Significantly heavier (+85 lbs), making it harder to move.
- –Weaker inverter (-840W) limits appliance compatibility.
- –Very heavy unit that may be difficult for one person to lift.
BLUETTI Apex 300 + 2×B500K
With a massive 3,840W output (and 7,680W surge), the Apex 300 + 2×B500K can run high-wattage appliances like space heaters, hair dryers, and electric grills without tripping. Weighing in at 282.2 lbs, this is not a unit you want to carry far. It's best suited as a stationary backup or RV companion. A standout feature is the value proposition: at roughly $0.44 per watt-hour, it's one of the most cost-effective options on the market.
Strengths
- +Lighter by 85 lb
- +Larger battery capacity
- +Higher AC output
- +Longer warranty
Trade-offs
- –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
Either unit
Both handle two nights comfortably. The AC300 + 4×B300 uses 20% and the Apex 300 + 2×B500K uses 19%. With this little difference, pick based on weight and portability instead. The lighter unit wins for car camping.
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
Either unit
Both survive the blackout with similar margin. Since the capacity difference doesn't matter here, focus on which unit has UPS mode — seamless switchover protects your router and PC from the split-second power gap.
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 are wildly overqualified for CPAP. You're using 3% or less. Save your money and buy whichever is cheaper; the extra capacity is completely wasted on a 40W overnight load. Put the savings toward a second battery for multi-night trips.
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
Either unit
Both power your workstation all day without breaking a sweat. At these utilization levels, prioritize the unit with better USB-C output for direct laptop charging. It's more convenient than using the AC inverter and wastes less energy.
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
Either unit
Both handle game day easily. Since capacity isn't the deciding factor, consider weight: the lighter unit is easier to load into a truck bed. Also check if either has Bluetooth speaker-level noise. Fan sound matters in social settings.
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
Either unit
Both units cover a full day of van life, but barely. You'll need consistent solar recharge to sustain this daily. Check which unit accepts more solar input for faster recovery between days.
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: Apex 300 + 2×B500K runs 53.9h vs 51h.
$5,690 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 0–736.9hComfort & 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
July 10, 2026
Verdict: the Apex 300 + 2×B500K
The Apex 300 + 2×B500K takes the lead. It packs 716.8Wh more capacity and delivers 840W more power than the AC300 + 4×B300. Despite being $94 pricier, its superior specs make it more future-proof.
Overall score margin: 9,180 vs 10,032 (−9.3%)
List prices as of July 10, 2026. The links below open BLUETTI's current price.
$5,690.00 list · direct from BLUETTI
or check the AC300 + 4×B300 price$5,596.00 list
Written by Gunner Gustafson, Whole-Home Backup Tester · Station Arena Test Desk · Updated July 10, 2026
Measured Data
Benchmark scores and the full spec record, side by side.
Benchmark scores
Full specifications
| Specification | AC300 + 4×B300 | Apex 300 + 2×B500K★ Our pick |
|---|---|---|
| Price | $5,596.00 Check latest price | $5,690.00 Check latest price |
| Capacity (Wh) | 12288 | 13004.8 |
| Output (W) | 3000 | 3840 |
| Surge Peak | 6000W | 7680W |
| AC Outlets | 7 | 6 |
| USB-C Charging Outputs | 100W | 100W |
| Solar Input (W) | 2400 | 2400 |
| Weight (lbs) | 367.2 | 282.2 |
| UPS | Yes (20ms) | Yes (<10ms) |
| Charging Cycles | 3500 | 3500+ |
| Chemistry | LiFePO4 | LiFePO4 |
| Warranty (Years) | 4 | 5 |
| Battery Expansion Feasibility | Yes | Yes |
| App Control | Yes | Yes |
| $/Watt Hour | $.46 | $.44 |
| Noise Level (db) | Not Specified | 45 |
| Solar Input Type | MPPT (12-150V, 2x1200W) | MC4 |
| USB-A Ports | 2 | 2 |
| USB-C Ports | 2 | 2 |
| Cost per Whᵈ | $0.46/Wh | $0.44/Wh |
ᵈ Derived: price ÷ rated capacity.
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.
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.
Test Notes & Caveats
Hidden gotchas and advantages we spotted that you won't find on the product page.
Weight Reality Check
Neither unit is grab-and-go. The Apex 300 + 2×B500K (282.2 lbs) is a two-person lift. The AC300 + 4×B300 (367.2 lbs) is firmly a two-person lift. It goes where you put it and stays there. That's a 85 lb difference, which you'll feel every time you relocate.
Apex 300 + 2×B500K: 45dB Under Load
45dB is about as loud as a running refrigerator. If you're running a CPAP or sleeping near this unit, the fan noise may be noticeable. Most people find anything above 45dB disruptive for sleep.
UPS Speed: line-interactive (<10ms) vs standby (<20ms)
The Apex 300 + 2×B500K switches to battery in 10ms (line-interactive (<10ms)), while the AC300 + 4×B300 takes 20ms (standby (<20ms)). Safe for desktop PCs, routers, and CPAP machines. NAS drives are protected. This matters if you're using it as a home UPS for always-on equipment.
AC300 + 4×B300: Noise Level Not Disclosed
The Apex 300 + 2×B500K publishes its noise level (45dB), but the AC300 + 4×B300 doesn't. Brands that don't disclose noise specs often have louder units. If noise matters to you (CPAP users, apartment dwellers), this is worth investigating before buying.
Full record above — the Test Desk pick is the Apex 300 + 2×B500K.
Check Apex 300 + 2×B500K price →or check the AC300 + 4×B300 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.
| Metric | AC300 + 4×B300 | Apex 300 + 2×B500K |
|---|---|---|
| Purchase price | $5,596.00 | $5,690.00 |
| Lifetime energy delivery | 43,008 kWh | 45,517 kWh |
| Cost per lifetime kWh | $0.13 | $0.13 |
| Cost per warranty year | $1,399/yr | $1,138/yr |
| Battery lifespan | 9.6yr daily · 33.7yr weekends · 67.3yr weekly | 9.6yr daily · 33.7yr weekends · 67.3yr weekly |
Analyst note
Both units have similar long-term ownership costs ($0.13/kWh vs $0.13/kWh). The price difference is what you see on the sticker — neither is a hidden bargain or rip-off.
Growth path
AC300 + 4×B300
EXPANDABLESupports BLUETTI expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 12,288Wh.
Accepts up to 2,400W of solar. Enough for a serious multi-panel array.
Generous port selection supports complex multi-device setups.
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.
Generous port selection supports complex multi-device setups.
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.
The Bottom Line
The full picture comes down to this. The Apex 300 + 2×B500K edges ahead on our overall analysis, but the margin is narrow enough that your specific use case should drive the decision. Review the scenario verdicts above — if the AC300 + 4×B300 wins in the scenarios that match your life, it's the right choice regardless of aggregate scores.
If neither the AC300 + 4×B300 nor the Apex 300 + 2×B500K feels like the right fit, your power needs probably sit outside what these two target. For lighter use — weekend camping or phone/laptop charging — you'd be overpaying for capacity you'll rarely tap. Consider a unit in the 500–1,500Wh range instead. Prices on portable power stations fluctuate frequently. Both BLUETTI discount regularly, so check the current price before committing. Prime Day and Black Friday pricing typically drops 20-30%.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
How does the 716.8Wh capacity difference actually affect daily use?
The Apex 300 + 2×B500K's 13,004.8Wh battery keeps a mini-fridge running for roughly 74 hours vs the AC300 + 4×B300's 70 hours. Both can handle a full 8-hour blackout setup (fridge + router + lights + phone charging ≈ 1,645Wh), but the Apex 300 + 2×B500K finishes with significantly more margin. That matters if conditions aren't ideal or the outage runs long. What specs don't mention: runtime drops 20-30% in cold weather (below 32°F/0°C) as battery chemistry slows down. The Apex 300 + 2×B500K's extra capacity provides a critical cold-weather buffer. For occasional phone and laptop charging, both are overkill. This gap only matters for sustained, multi-appliance use.
Can I actually carry the AC300 + 4×B300, or is the Apex 300 + 2×B500K the only portable option?
Neither is "portable" in any hiking sense. The Apex 300 + 2×B500K (282.2 lbs) and the AC300 + 4×B300 (367.2 lbs) are both appliances you place and leave. The 85-lb difference matters when loading into a vehicle or moving between rooms, but that's about it. If true portability is your priority, look at units under 20 lbs in a different class entirely.
Bottom line: should I buy the AC300 + 4×B300 or the Apex 300 + 2×B500K?
We'd pay the premium for the Apex 300 + 2×B500K. Yes, it costs more. The capability jump is real: you're stepping into a tier that handles appliances the base model can't start. The AC300 + 4×B300 is still solid if budget is the priority, but the Apex 300 + 2×B500K will leave you less likely to wish you'd "gone bigger" six months from now. That regret costs more than the price difference.
Where to buy
BLUETTI AC300 + 4×B300
$5,596.00
$5,596.00 list · direct from BLUETTI
BLUETTI Apex 300 + 2×B500KPick
$5,690.00
$5,690.00 list · direct from BLUETTI
Prices may vary by retailer and are subject to change.