Head-to-head test
BLUETTI AC500 + 2×B300K vs BLUETTI EB3A
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
6,488Power Score · The AC & Fridge Zone
$3,948.00 list · direct from BLUETTI
BLUETTI
EB3A
1,543Power Score · Device Hub
$219.00 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 EB3A (268Wh, 600W) come from different product lines with different engineering priorities and a $3,729 price gap. The AC500 + 2×B300K 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 AC500 + 2×B300K's 5,000W inverter has the headroom for a window AC, a full-size fridge, and power tools. The EB3A's 600W inverter can't start the heaviest of those — a window AC or a high-surge power tool will trip it. On stamina, the AC500 + 2×B300K keeps a fridge alive for roughly 31 hours vs the EB3A's 2 hours. The cost? Portability. At 196.1 lbs, the AC500 + 2×B300K is a two-person lift you set down once and leave. The EB3A at 10.1 lbs is something one person can actually carry.
Pick the AC500 + 2×B300K if your primary use is weekend camping or 8-hour blackout. Go with the EB3A if its specific strengths below line up better with your use. Most buyers stop at the sticker price and miss this: over a full lifespan the AC500 + 2×B300K works out to about $0.2/kWh against the EB3A's $0.33, a gap that compounds in the AC500 + 2×B300K's favor the more you cycle it. 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
- +Larger battery capacity
- +Higher AC output
- +Faster solar charging
- +Rated for 3,500 charge cycles — much longer battery lifespan
Trade-offs
- –Substantially more expensive (+$3,729) than the EB3A.
- –Significantly heavier (+186 lbs), making it harder to move.
- –Very heavy unit that may be difficult for one person to lift.
BLUETTI EB3A
At 600W, this unit is strictly for personal electronics (phones, laptops) and small CPAP machines. Do not expect to run kitchen appliances. At only 10.1 lbs, it is exceptionally portable. You can easily carry it one-handed to a campsite or tailgating party.
Strengths
- +Costs $3,729 less
- +Lighter by 186 lb
- +Longer warranty
Trade-offs
- –Weaker inverter (-4,400W) limits appliance compatibility.
- –Sealed capacity — the AC500 + 2×B300K can add batteries to grow past 268Wh; this one can't.
- –Shorter-lived battery — rated for 2,500 charge cycles vs the AC500 + 2×B300K's 3,500, so it wears out sooner.
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
AC500 + 2×B300K
The EB3A runs out of juice. It only has 228Wh usable, but this scenario needs 2,100Wh. The AC500 + 2×B300K covers it and still has 173h of phone charging left over.
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
AC500 + 2×B300K
The EB3A runs out of juice. It only has 228Wh usable, but this scenario needs 1,645Wh. The AC500 + 2×B300K covers it and still has 204h of phone charging left over.
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
AC500 + 2×B300K
The EB3A runs out of juice. It only has 228Wh usable, but this scenario needs 320Wh. The AC500 + 2×B300K covers it and still has 292h of phone charging left over.
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
AC500 + 2×B300K
The EB3A runs out of juice. It only has 228Wh usable, but this scenario needs 910Wh. The AC500 + 2×B300K covers it and still has 253h of phone charging left over.
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
AC500 + 2×B300K
The EB3A runs out of juice. It only has 228Wh usable, but this scenario needs 670Wh. The AC500 + 2×B300K covers it and still has 269h of phone charging left over.
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
AC500 + 2×B300K
The EB3A runs out of juice. It only has 228Wh usable, but this scenario needs 4,685Wh. The AC500 + 2×B300K covers it and still has 1h of phone charging left over.
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: AC500 + 2×B300K runs 22.9h vs 1.1h.
$3,948 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 0–313.4hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–62.7hHigh-Draw Appliances
These reveal the real limitsscale 0–4.7h¹ 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 AC500 + 2×B300K, on Power Score margin
These two units are closely matched on individual specs, but our Power Score analysis gives the AC500 + 2×B300K the edge with a composite score of 6,488 vs 1,543.
Overall score margin: 6,488 vs 1,543 (+320.5%)
List prices as of July 10, 2026. The links below open BLUETTI's current price.
$3,948.00 list · direct from BLUETTI
or check the EB3A price$219.00 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
Not rated for both units (minimum threshold unmet): Home Backup, CPAP, Solar Generator, Tailgating, Food Truck, Apartment Balcony, Camping.
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, AC500 + 2×B300K rates 4.2/5 (53rd percentile of 16 Home Backup-class units), and EB3A rates 3.8/5 (29th percentile of 22 Personal-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.
AC500 + 2×B300K: 196.1 lbs Is a Commitment
At 196.1 lbs, this is a two-person lift. Plan your placement carefully. Once it's set up, you won't want to move it. It's a semi-permanent appliance. Pick your spot.
EB3A: 50dB Under Load
50dB is about as loud as moderate rainfall. 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.
EB3A: Fixed Capacity
The EB3A is sealed at 268Wh — fine if that covers you, but it's the ceiling. The AC500 + 2×B300K starts at 5,530Wh and can add expansion batteries, so if your needs may climb toward partial-home backup, it has room to grow the EB3A doesn't.
UPS Speed: standby (<20ms) vs basic standby
The AC500 + 2×B300K switches to battery in 20ms (standby (<20ms)), while the EB3A takes 30ms (basic standby). Most electronics handle this fine, but sensitive server equipment may hiccup. This matters if you're using it as a home UPS for always-on equipment.
Battery Lifespan in Real Years
The AC500 + 2×B300K is rated for 3,500 cycles vs 2,500. In real life: at daily use, that's 9.6 vs 6.8 years. At weekend use (twice a week), it's 34 vs 24 years. After hitting the cycle limit, the battery doesn't die. It drops to ~80% original capacity, which is still very usable.
AC500 + 2×B300K: Noise Level Not Disclosed
The EB3A publishes its noise level (50dB), 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 AC500 + 2×B300K.
Check AC500 + 2×B300K price →or check the EB3A 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 EB3A is cheaper to buy, but the AC500 + 2×B300K is cheaper to own. At $0.2/kWh over its lifetime vs $0.33/kWh, the AC500 + 2×B300K's higher cycle life and capacity make each dollar go further over the years.
Delivers each lifetime kWh for $0.13 less — check the AC500 + 2×B300K 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.
Limited ports. You'll likely need a power strip or splitter.
Expansion batteries are BLUETTI-specific. You're investing in the BLUETTI ecosystem.
EB3A
FIXED CAPACITYFixed at 268Wh, with no expansion — so size it for your needs up front rather than planning to add capacity later.
Accepts up to 200W of solar. Limited to a single portable panel.
Limited ports. You'll likely need a power strip or splitter.
Realistic full solar rechargeat 70% of rated panel output — see methodology
Analyst note
The EB3A is sealed at 268Wh, which is fine if that covers you. The AC500 + 2×B300K starts at 5,530Wh and can grow beyond it with BLUETTI expansion batteries — real headroom the EB3A doesn't have if your needs climb toward partial-home backup.
The Bottom Line
The full picture comes down to this. The AC500 + 2×B300K 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 EB3A 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 EB3A 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.
Is the AC500 + 2×B300K worth $3,729 more than the EB3A?
The short answer: yes, if you'll actually use the extra capability. The AC500 + 2×B300K costs $3,729 more, but that premium buys you 5,262Wh more battery capacity (that's 30 extra hours of running a mini-fridge); 4,400W higher AC output (opening the door to more demanding appliances); a longer-lasting battery rated for 3,500 cycles — that's 10 years at daily use; 2,800W faster solar charging for quicker off-grid recovery. On a cost-per-watt-hour basis, you're paying $0.71/Wh vs $0.82/Wh. Factor in cycle life and the math flips: the AC500 + 2×B300K costs $0.20/kWh over its lifetime vs $0.33/kWh. The "expensive" unit is actually cheaper to own. For regular use, we'd pay the premium.
How does the 5,262Wh capacity difference actually affect daily use?
The AC500 + 2×B300K's 5,530Wh battery keeps a mini-fridge running for roughly 31 hours vs the EB3A's 2 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 AC500 + 2×B300K handles it while the EB3A 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 AC500 + 2×B300K'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 EB3A the only portable option?
The EB3A at 10.1 lbs is genuinely grab-and-go. Toss it in a backpack, carry it one-handed to a picnic, take it on a boat. The AC500 + 2×B300K at 196.1 lbs is a different story. It's like carrying a large suitcase full of books. If you're setting up and breaking down camp frequently, this weight difference will exhaust you by day two.
How fast can each unit recharge from solar panels in real conditions?
On paper, the AC500 + 2×B300K accepts 3,000W vs the EB3A's 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 2.6 hours for the AC500 + 2×B300K and 1.9 hours for the EB3A. 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.
"3,500 vs 2,500 cycles" — what does that actually mean for me?
In real years: the AC500 + 2×B300K (3,500 cycles) lasts 9.6 years at daily use, 34 years at weekend use (twice a week), or 146 years at twice-monthly camping trips. The EB3A (2,500 cycles): 6.8 years daily, 24 years weekends, or 104 years twice-monthly. What most people miss: hitting the cycle limit doesn't kill your battery. Capacity drops to about 80%. Your 5,530Wh unit becomes a ~4,424Wh unit. Still very usable. For weekend users, both batteries will outlast the warranty by years.
What if I need more capacity than the EB3A's 268Wh later?
The EB3A is sealed at 268Wh, so if you expect your needs to climb, the AC500 + 2×B300K is the more future-proof pick: it starts at 5,530Wh and adds BLUETTI-compatible batteries without replacing the base unit. That said, "not expandable" isn't a flaw on its own — if 268Wh comfortably covers your loads, the EB3A is a complete unit, not a downgrade.
Bottom line: should I buy the AC500 + 2×B300K or the EB3A?
We'd pay the premium for the AC500 + 2×B300K. 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 EB3A is still solid if budget is the priority, but the AC500 + 2×B300K 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 AC500 + 2×B300KPick
$3,948.00
$3,948.00 list · direct from BLUETTI
BLUETTI EB3A
$219.00
$219.00 list · direct from BLUETTI
Prices may vary by retailer and are subject to change.