Head-to-head test
BLUETTI AC500 + 2×B300K vs BLUETTI Apex 300 + 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
AC500 + 2×B300K
6,612Power Score · The AC & Fridge Zone
$3,299.00 list · direct from BLUETTI
BLUETTI
Apex 300 + B500K
7,794Power Score · The AC & Fridge Zone
$3,199.00 list · direct from BLUETTI
Spec deltas
Both carry the BLUETTI name, but they're built for different buyers. The AC500 + 2×B300K (5,530Wh, 5,000W) and the Apex 300 + B500K (7,885Wh, 3,840W) come from different product lines with different engineering priorities. We'd buy the Apex 300 + B500K.
What the spec gap means in practice: the Apex 300 + B500K's 3,840W inverter can run a window AC unit, a full-size fridge, or power tools. The AC500 + 2×B300K's 5,000W inverter will flat-out refuse to start those appliances. On stamina, the Apex 300 + B500K keeps a fridge alive for roughly 45 hours vs the AC500 + 2×B300K's 31 hours.
Pick the Apex 300 + B500K if your primary use is weekend camping or 8-hour blackout. Go with the AC500 + 2×B300K if you need the heavier-duty specs for demanding loads. Most buyers overlook this: the Apex 300 + B500K costs ~$0.12/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 AC500 + 2×B300K
With a massive 5,000W output (and 10,000W surge), the AC500 + 2×B300K can run high-wattage appliances like space heaters, hair dryers, and electric grills without tripping. Weighing in at 196.1 lbs, this is not a unit you want to carry far. It's best suited as a stationary backup or RV companion.
Strengths
- +Higher AC output
- +Faster solar charging
Trade-offs
- –Significantly heavier (+13.1 lbs), making it harder to move.
- –Very heavy unit that may be difficult for one person to lift.
BLUETTI Apex 300 + B500K
With a massive 3,840W output (and 7,680W surge), the Apex 300 + B500K can run high-wattage appliances like space heaters, hair dryers, and electric grills without tripping. Weighing in at 183 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 $0.41 per watt-hour, it's one of the most cost-effective options on the market.
Strengths
- +Costs $100 less
- +Lighter by 13.1 lb
- +Larger battery capacity
- +Longer warranty
Trade-offs
- –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
Apex 300 + B500K
The AC500 + 2×B300K cuts it close at 45%. One cold night or an unexpected device and you're rationing power. The Apex 300 + B500K finishes at 31%, leaving real headroom for spontaneous use. If you camp in variable weather, that buffer keeps you relaxed instead of checking your battery app every 20 minutes.
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 + B500K
Both survive, but the Apex 300 + B500K finishes at just 25% used. That's enough reserve for a second blackout night. The AC500 + 2×B300K at 35% 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 are wildly overqualified for CPAP. You're using 7% 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
Apex 300 + B500K
The AC500 + 2×B300K uses 100% of its battery. Doable but tight. Miss a day of solar recharge and you're in trouble. The Apex 300 + B500K at 70% gives a much more sustainable daily rhythm. For full-time van life, miss a recharge day with the tighter unit and the next 24 hours get stressful fast.
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 + B500K runs 32.7h vs 22.9h.
$3,199 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 0–446.8hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–89.4hHigh-Draw Appliances
These reveal the real limitsscale 0–6.7h¹ Runtime = (capacity × 0.85) ÷ appliance watts. Within each group, all bars share one time scale (the group's longest runtime), so lengths are comparable across appliances; identical runtimes collapse into a single blue/orange bar. Actual runtime varies with battery age, temperature, and simultaneous loads — see methodology.
Conclusion
July 10, 2026
Verdict: the Apex 300 + B500K
The Apex 300 + B500K takes the lead. It packs 2,354.8Wh more capacity than the AC500 + 2×B300K. With a price tag that is $100 lower, it provides significantly better value.
Overall score margin: 6,612 vs 7,794 (−17.9%)
List prices as of July 10, 2026. The links below open BLUETTI's current price.
$3,199.00 list · direct from BLUETTI
or check the AC500 + 2×B300K price$3,299.00 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 | AC500 + 2×B300K | Apex 300 + B500K★ Our pick |
|---|---|---|
| Price | $3,299.00 Check latest price | $3,199.00 Check latest price |
| Capacity (Wh) | 5530 | 7884.8 |
| Output (W) | 5000 | 3840 |
| Surge Peak | 10000W | 7680W |
| AC Outlets | Not Specified | 6 |
| USB-C Charging Outputs | 100W | 100W |
| Solar Input (W) | 3000 | 2400 |
| Weight (lbs) | 196.1 | 183 |
| UPS | Yes (20ms) | Yes (<10ms) |
| Charging Cycles | 3500 | 3500+ |
| Chemistry | LiFePO4 | LiFePO4 |
| Warranty (Years) | Not Specified | 5 |
| Battery Expansion Feasibility | Yes | Yes |
| App Control | Yes | Yes |
| $/Watt Hour | $.60 | $.41 |
| Noise Level (db) | Not Specified | 45 |
| Solar Input Type | MPPT | MC4 |
| USB-A Ports | 2 | 2 |
| USB-C Ports | 2 | 2 |
| Cost per Whᵈ | $0.60/Wh | $0.41/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 + B500K (183 lbs) is a two-person lift. The AC500 + 2×B300K (196.1 lbs) is firmly a two-person lift. It goes where you put it and stays there. That's a 13 lb difference.
Apex 300 + 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 + B500K switches to battery in 10ms (line-interactive (<10ms)), while the AC500 + 2×B300K 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.
AC500 + 2×B300K: Noise Level Not Disclosed
The Apex 300 + B500K publishes its noise level (45dB), but the AC500 + 2×B300K 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 + B500K.
Check Apex 300 + 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.
| Metric | AC500 + 2×B300K | Apex 300 + B500K |
|---|---|---|
| Purchase price | $3,299.00 | $3,199.00 |
| Lifetime energy delivery | 19,355 kWh | 27,597 kWh |
| Cost per lifetime kWh | $0.17 | $0.12 |
| Cost per warranty year | $∞/yr | $640/yr |
| Battery lifespan | 9.6yr daily · 33.7yr weekends · 67.3yr weekly | 9.6yr daily · 33.7yr weekends · 67.3yr weekly |
Analyst note
The Apex 300 + B500K wins on both sticker price and long-term value. At $0.12/kWh over its lifetime, it's meaningfully cheaper to own. Clear value winner.
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.
Limited ports. You'll likely need a power strip or splitter.
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 — useful if your needs may climb past 7,885Wh.
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 + 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 AC500 + 2×B300K wins in the scenarios that match your life, it's the right choice regardless of aggregate scores.
If neither the AC500 + 2×B300K nor the Apex 300 + 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 2,354.8Wh capacity difference actually affect daily use?
The Apex 300 + B500K's 7,884.8Wh battery keeps a mini-fridge running for roughly 45 hours vs the AC500 + 2×B300K's 31 hours. Both can handle a full 8-hour blackout setup (fridge + router + lights + phone charging ≈ 1,645Wh), but the Apex 300 + 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 + 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 AC500 + 2×B300K, or is the Apex 300 + B500K the only portable option?
Neither is "portable" in any hiking sense. The Apex 300 + B500K (183 lbs) and the AC500 + 2×B300K (196.1 lbs) are both appliances you place and leave. The 13.1-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.
How fast can each unit recharge from solar panels in real conditions?
On paper, the AC500 + 2×B300K accepts 3,000W vs the Apex 300 + B500K's 2,400W of solar input. What the spec sheet won't tell you: solar panels typically deliver only 60-80% of their rated output due to panel angle, cloud cover, and temperature. In realistic conditions, expect full recharge in about 2.6 hours for the AC500 + 2×B300K and 4.7 hours for the Apex 300 + B500K. That gap widens on cloudy days, when the AC500 + 2×B300K's higher input ceiling captures more of whatever sunlight is available. One more thing: summer gives you ~7 productive solar hours per day. Winter drops to ~4. If solar is your primary recharge method, the AC500 + 2×B300K's advantage is substantial.
Bottom line: should I buy the AC500 + 2×B300K or the Apex 300 + B500K?
We'd buy the Apex 300 + B500K. Cheaper and more capable. That combination is rare. The AC500 + 2×B300K doesn't offer a compelling reason to spend more unless you specifically need a feature unique to the BLUETTI ecosystem (expansion batteries, app integrations). Otherwise, clear call.
Where to buy
BLUETTI AC500 + 2×B300K
$3,299.00
$3,299.00 list · direct from BLUETTI
BLUETTI Apex 300 + B500KPick
$3,199.00
$3,199.00 list · direct from BLUETTI
Prices may vary by retailer and are subject to change.