Head-to-head test
BLUETTI AC500 + 2×B300K vs BLUETTI EP500
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
EP500
4,864Power Score · Appliance Class
$2,999.00 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 EP500 (5,120Wh, 2,000W) come from different product lines with different engineering priorities and a $300 price gap. The AC500 + 2×B300K has a slight edge, but the margin is close enough that your use case should break the tie.
The AC500 + 2×B300K's 5,530Wh keeps a fridge going for 31 hours. The EP500's 5,120Wh manages 29 hours. The bigger unit rides out a full weekend outage. The smaller one needs a recharge by Saturday night. But if your actual use case is camping, tailgating, or keeping devices charged, the EP500 does the job at 167 lbs and $2,999 — no overkill, no regret.
Pick the AC500 + 2×B300K if your primary use is van life daily. Go with the EP500 if you need the heavier-duty specs for demanding loads. Most buyers overlook this: the AC500 + 2×B300K costs ~$0.17/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
- +Larger battery capacity
- +Higher AC output
- +Faster solar charging
Trade-offs
- –Significantly heavier (+29.1 lbs), making it harder to move.
- –Very heavy unit that may be difficult for one person to lift.
BLUETTI EP500
The 2,000W inverter handles most daily devices like laptops, blenders, and TVs, but will struggle with heating elements that require over 1500W. Weighing in at 167 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 $0.59 per watt-hour, it's one of the most cost-effective options on the market.
Strengths
- +Costs $300 less
- +Lighter by 29.1 lb
Trade-offs
- –Weaker inverter (-3,000W) limits appliance compatibility.
- –Very heavy unit that may be difficult for one person to lift.
- –Sealed capacity — the AC500 + 2×B300K can add batteries to grow past 5,120Wh; this one can't.
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 EP500 uses 48% and the AC500 + 2×B300K uses 45%. 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 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
AC500 + 2×B300K
The EP500 runs out of juice. It only has 4,352Wh 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 21.2h.
$3,299 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 6,612 vs 4,864.
Overall score margin: 6,612 vs 4,864 (+35.9%)
List prices as of July 10, 2026. The links below open BLUETTI's current price.
$3,299.00 list · direct from BLUETTI
or check the EP500 price$2,999.00 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★ Our pick | EP500 |
|---|---|---|
| Price | $3,299.00 Check latest price | $2,999.00 Check latest price |
| Capacity (Wh) | 5530 | 5120 |
| Output (W) | 5000 | 2000 |
| Surge Peak | 10000W | 4800W |
| AC Outlets | Not Specified | 4 |
| USB-C Charging Outputs | 100W | 100W |
| Solar Input (W) | 3000 | 1200 |
| Weight (lbs) | 196.1 | 167 |
| UPS | Yes (20ms) | Yes (20ms) |
| Charging Cycles | 3500 | 3500 |
| Chemistry | LiFePO4 | LiFePO4 |
| Warranty (Years) | Not Specified | Not Specified |
| Battery Expansion Feasibility | Yes | No |
| App Control | Yes | Yes |
| $/Watt Hour | $.60 | $.59 |
| Noise Level (db) | Not Specified | Not Specified |
| Solar Input Type | MPPT | MPPT |
| USB-A Ports | 2 | 2 |
| USB-C Ports | 2 | 2 |
| Cost per Whᵈ | $0.60/Wh | $0.59/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 EP500 (167 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 29 lb difference.
EP500: Fixed Capacity
The EP500 is sealed at 5,120Wh — 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 EP500 doesn't.
Surge Power: Inverter Quality Indicator
The EP500 has a 2.4× surge-to-continuous ratio vs the AC500 + 2×B300K's 2×. A higher ratio (≥2×) means the inverter handles motor startup surges better. That's critical for fridges, AC compressors, and power tools that briefly draw 2-3× their rated wattage. The AC500 + 2×B300K may trip when starting these appliances even though its continuous wattage looks sufficient.
Full record above — the Test Desk pick is the AC500 + 2×B300K.
Check AC500 + 2×B300K price →or check the EP500 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
Reaching the cycle rating means ~80% capacity remains — degraded, not dead.
| Metric | AC500 + 2×B300K | EP500 |
|---|---|---|
| Purchase price | $3,299.00 | $2,999.00 |
| Lifetime energy delivery | 19,355 kWh | 17,920 kWh |
| Cost per lifetime kWh | $0.17 | $0.17 |
| Cost per warranty year | $∞/yr | $∞/yr |
| Battery lifespan | 9.6yr daily · 33.7yr weekends · 67.3yr weekly | 9.6yr daily · 33.7yr weekends · 67.3yr weekly |
Analyst note
The EP500 is cheaper to buy, but the AC500 + 2×B300K is cheaper to own. At $0.17/kWh over its lifetime vs $0.17/kWh, the AC500 + 2×B300K's higher cycle life and capacity make each dollar go further over the years.
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.
EP500
FIXED CAPACITYFixed at 5,120Wh — a sealed, complete system. No expansion port, but that capacity already covers heavy and multi-day loads.
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.
Realistic full solar rechargeat 70% of rated panel output — see methodology
Analyst note
The EP500 is sealed at 5,120Wh, 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 EP500 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 EP500 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 EP500 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.
Is the AC500 + 2×B300K worth $300 more than the EP500?
The short answer: yes, if you'll actually use the extra capability. The AC500 + 2×B300K costs $300 more, but that premium buys you 3,000W higher AC output (opening the door to more demanding appliances); 1,800W faster solar charging for quicker off-grid recovery. On a cost-per-watt-hour basis, you're paying $0.60/Wh vs $0.59/Wh. For regular use, we'd pay the premium.
Can I actually carry the AC500 + 2×B300K, or is the EP500 the only portable option?
Neither is "portable" in any hiking sense. The EP500 (167 lbs) and the AC500 + 2×B300K (196.1 lbs) are both appliances you place and leave. The 29.1-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 EP500'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 2.6 hours for the AC500 + 2×B300K and 6.1 hours for the EP500. 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.
What if I need more capacity than the EP500's 5,120Wh later?
The EP500 is sealed at 5,120Wh, 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 5,120Wh comfortably covers your loads, the EP500 is a complete unit, not a downgrade.
Bottom line: should I buy the AC500 + 2×B300K or the EP500?
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 EP500 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
$3,299.00
$3,299.00 list · direct from BLUETTI
BLUETTI EP500
$2,999.00
$2,999.00 list · direct from BLUETTI
Prices may vary by retailer and are subject to change.