Head-to-head test
BLUETTI AC240P vs BLUETTI EP900 + 3×B500
Real-world runtimes, scenario verdicts, and ownership costs compared — which wins for your use case.
Full profiles: BLUETTI AC240P → · BLUETTI EP900 + 3×B500 →
Written by Gunner GustafsonUpdated
Whole-Home Backup Tester, Station Arena Test Desk
Spec deltas
Both carry the BLUETTI name, but they're built for different buyers. The AC240P (1,843Wh, 2,400W) and the EP900 + 3×B500 (14,880Wh, 9,000W) come from different product lines with different engineering priorities and a $12,336 price gap. The EP900 + 3×B500 has a slight edge, but the margin is close enough that your use case should break the tie.
What the spec gap means in practice: the EP900 + 3×B500's 9,000W inverter has the headroom for a window AC, a full-size fridge, and power tools. The AC240P's 2,400W inverter still runs most single appliances; the EP900 + 3×B500's real edge is surge headroom for the biggest motor starts and stacking several heavy loads at once. On stamina, the EP900 + 3×B500 keeps a fridge alive for roughly 84 hours vs the AC240P's 10 hours. The cost? Portability. At 466 lbs, the EP900 + 3×B500 is spread across boxes you site once and leave. The AC240P at 72 lbs is more manageable, though still not light.
Pick the EP900 + 3×B500 if your primary use is 8-hour blackout or remote workday. Go with the AC240P if you primarily need it for tailgate party. 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 AC240P
With a massive 2,400W output, the AC240P can run high-wattage appliances like space heaters, hair dryers, and electric grills without tripping. Weighing in at 72 lbs, this is not a unit you want to carry far. It's best suited as a stationary backup or RV companion.
Strengths
- +Lighter by 394 lb
Trade-offs
- –Weaker inverter (-6,600W) limits appliance compatibility.
- –Shorter-lived battery — rated for 3,500 charge cycles vs the EP900 + 3×B500's 6,000, so it wears out sooner.
BLUETTI EP900 + 3×B500
With a massive 9,000W output, the EP900 + 3×B500 can run high-wattage appliances like space heaters, hair dryers, and electric grills without tripping. Weighing in at 466 lbs, this is not a unit you want to carry far. It's best suited as a stationary backup or RV companion.
Strengths
- +Larger battery capacity
- +Higher AC output
- +Longer warranty
- +Faster solar charging
- +Rated for 6,000 charge cycles — much longer battery lifespan
Trade-offs
- –Significantly heavier (+394 lbs), making it harder to move.
- –Very heavy unit that may be difficult for one person to lift.
Will It Power Your Gear?
Scenario math and per-appliance runtimes, modeled from the spec record.
Scenario verdicts
We ran the math on six real-world scenarios. Here's which unit survives your actual life.
SCN-01 · 2 nights · needs 2,100Wh
Weekend Camping
Two nights off-grid with essential comfort
Neither unit
Neither gives you a powered weekend: the EP900 + 3×B500 has the energy but is wired to the building, and the AC240P covers about 75% of the 2,100Wh. One can't go; the other can't finish.
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
EP900 + 3×B500
The AC240P comes up just short — it needs 1,645Wh and has 1,567Wh usable, a 78Wh gap (its nameplate 1,843Wh actually clears this — the flat 15% conversion allowance is what tips it under). Trim that much — one small appliance's worth across the day — and it finishes. The EP900 + 3×B500 covers it outright with 11,003Wh to spare.
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. The only published difference is fan noise, and it can't settle this: the AC240P is rated 45dB and the EP900 + 3×B500 50dB, but both are BLUETTI's own ratings on one convention, best-case floors rather than readings at a CPAP's draw. Neither settles which box is quieter at a bedside. Only the EP900 + 3×B500 is still sold, so a new purchase here is just the EP900 + 3×B500; the AC240P is a used-market question.
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
EP900 + 3×B500
The EP900 + 3×B500 clears the workday at 7% used, banking 11,738Wh — late work, extra calls, or a second laptop charge without arithmetic. The AC240P at 58% also finishes, with 657Wh 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
AC240P
The EP900 + 3×B500 is installed at the electrical panel — it backs up the building and doesn't leave it, so this scenario belongs to the AC240P by default — and it earns it, covering the 670Wh with 897Wh to spare. Capacity was never the EP900 + 3×B500's problem here; getting to a tailgate was.
Battery budget usedlower = more headroom
LOAD Blender 400W×0.5h · LED TV (55") 80W×4h · Bluetooth Speaker 15W×4h · Phone Charger (×3) 45W×2h
SCN-06 · 24 hours · needs 4,685Wh
Van Life Daily
A full day of mobile living — the ultimate endurance test
Neither unit
Neither gives you a powered van: the EP900 + 3×B500 has the energy but is wired to the building, and the AC240P covers about 33% of the 4,685Wh. One can't go; the other can't finish.
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: EP900 + 3×B500 runs 61.7h vs 7.6h.
$13,798 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 0–843.2hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–168.6hHigh-Draw Appliances
These reveal the real limitsscale 0–12.6h¹ 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 EP900 + 3×B500, on Power Score margin
These two units are closely matched on individual specs, but our Power Score analysis gives the EP900 + 3×B500 the edge with a composite score of 12,335 vs 3,265.
Overall score margin: 3,265 vs 12,335 (−277.8%)
List prices as of July 10, 2026. The links below open BLUETTI's current price.
$13,798.00 · direct from BLUETTI
Last checked 28 days ago. Prices move — check before you buy.
Written by Gunner Gustafson, Whole-Home Backup Tester · Station Arena Test Desk · Updated July 10, 2026
Black Friday · 26 days out
Price to beat:EP900 + 3×B500 $13,798
We have never seen it discounted, so any real cut would be a first.
Measured Data
Benchmark scores and the full spec record, side by side.
Benchmark scores
Not rated for both units (minimum threshold unmet): UPS, RV Living, Solar Generator, Tailgating.
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.
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, AC240P rates 3.9/5 (35th percentile of 27 Everyday-class units), and EP900 + 3×B500 rates 4.1/5 (47th percentile of 37 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.
Weight Reality Check
Neither unit is grab-and-go. The AC240P (72 lbs) is manageable solo but heavier than a large checked suitcase. The EP900 + 3×B500 (466 lbs) is a wall-installed system — its weight matters to the installer on day one, then never again.
Fan Noise: Two Published Ratings
The AC240P is rated 45dB (like a running refrigerator), the EP900 + 3×B500 50dB (like moderate rainfall). Neither is a measurement on a shared bench — both are BLUETTI's own ratings on one convention, best-case floors rather than readings at a CPAP's draw. Take the pair as a prompt to find hands-on reports rather than as a gap you can act on. For most people, fan noise around 45dB and up is where sleep starts to suffer, and neither figure tells you what either unit does at a 40W draw.
AC240P: Power Lifting to 3,600W
The AC240P has BLUETTI's Power Lifting mode, which runs a resistive appliance rated up to 3,600W from its 2,400W 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 — a heater, a kettle, an incandescent lamp — 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 1,843Wh 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 EP900 + 3×B500 carries no Power Lifting figure, so check BLUETTI's own spec sheet before reading this as something the EP900 + 3×B500 lacks.
UPS Switchover: ≤10ms vs ≤15ms
Both list a UPS mode, at different rated speeds. The EP900 + 3×B500 is rated ≤10ms — quick enough on paper that desktop PCs and routers should ride through, treating that as the rating it is. The AC240P is rated ≤15ms — 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: 10 Years vs 6
The EP900 + 3×B500 is covered for 10 years against the AC240P's 6 years. An underrated factor if you're keeping this unit for years.
Battery Lifespan in Real Years
The EP900 + 3×B500 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 14,880Wh on the EP900 + 3×B500 and 1,843Wh on the AC240P, so count lifetime energy — roughly 89,280 kWh against 6,451 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.
Full record above — the Test Desk pick is the EP900 + 3×B500.
Check EP900 + 3×B500 price →Ownership 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 AC240P is no longer sold, so there is no price to work its cost per kWh from, and this comparison doesn't quote one. On what you can actually buy today, the EP900 + 3×B500 works out at $0.15/kWh over its rated life. If you already own the AC240P, the hardware comparison still holds: over its rated life the AC240P delivers about 6,451 kWh and the EP900 + 3×B500 about 89,280 kWh.
Growth path
AC240P
EXPANDABLESupports BLUETTI expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 1,843Wh.
Accepts up to 1,200W 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.
EP900 + 3×B500
EXPANDABLESupports BLUETTI expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 14,880Wh.
Accepts up to 9,000W 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.
Realistic full solar rechargeat 70% of rated panel output — see methodology
Analyst note
Growth only counts if you can still buy in, and the AC240P is no longer sold (BLUETTI points owners to the AC200L). That leaves the EP900 + 3×B500: it starts at 14,880Wh and takes BLUETTI expansion batteries, so the ceiling moves if your needs do. The AC240P's expandability still matters if you already own one, but it isn't a reason to pick it over the EP900 + 3×B500.
The Bottom Line
The full picture comes down to this. The EP900 + 3×B500 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 AC240P wins in the scenarios that match your life, it's the right choice regardless of aggregate scores.
If neither the AC240P nor the EP900 + 3×B500 feels like the right fit, your power needs probably sit outside what these two target. Use our comparison tool above to explore alternatives that better match your specific wattage and runtime requirements. 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 13,037Wh capacity difference actually affect daily use?
The EP900 + 3×B500's 14,880Wh battery keeps a mini-fridge running for roughly 84 hours vs the AC240P's 10 hours. Where it really matters: during an 8-hour blackout running your fridge, router, lights, AND charging your phone simultaneously (about 1,645Wh total), the EP900 + 3×B500 handles it while the AC240P runs dry. What specs don't mention: runtime drops 20-30% in cold weather (below 32°F/0°C) as battery chemistry slows down. The EP900 + 3×B500'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 EP900 + 3×B500, or is the AC240P the only portable option?
Neither is "portable" in any hiking sense. The AC240P (72 lbs) and the EP900 + 3×B500 (466 lbs) are both appliances you place and leave. The 394-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 EP900 + 3×B500 accepts 9,000W vs the AC240P's 1,200W 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 2.4 hours for the EP900 + 3×B500 and 2.2 hours for the AC240P. That gap widens on cloudy days, when the EP900 + 3×B500'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 EP900 + 3×B500's advantage is substantial.
"6,000 vs 3,500 cycles" — what does that actually mean for me?
In real years: the EP900 + 3×B500 (6,000 cycles) lasts 16.4 years at daily use, 58 years at weekend use (twice a week), or 250 years at twice-monthly camping trips. The AC240P (3,500 cycles): 9.6 years daily, 34 years weekends, or 146 years twice-monthly. What most people miss: hitting the cycle limit doesn't kill your battery. Capacity drops to about 80%. Your 14,880Wh unit becomes a ~11,904Wh unit. Still very usable. For weekend users, both batteries will outlast the warranty by years.
Bottom line: should I buy the AC240P or the EP900 + 3×B500?
We'd buy the EP900 + 3×B500. The AC240P is no longer sold, so there is no price to weigh it against; the comparison on this page still helps if you own one.
Where to buy
BLUETTI AC240P
No longer sold
BLUETTI EP900 + 3×B500Pick
$13,798.00
$13,798.00 · direct from BLUETTI
Last checked 28 days ago. Prices move — check before you buy.
Prices may vary by retailer and are subject to change.