Head-to-head test
BLUETTI AC500 + 2×B300K vs BLUETTI EP800 + 4×B500
Real-world runtimes, scenario verdicts, and ownership costs compared — which wins for your use case.
Full profiles: BLUETTI AC500 + 2×B300K →
Written by Gunner GustafsonUpdated
Whole-Home Backup Tester, Station Arena Test Desk
$3,299.00 · direct from BLUETTI
down from $3,948 · 16% below usual
Last checked 1 day ago. Prices move — check before you buy.
BLUETTI
EP800 + 4×B500
14,380Power Score · Whole-Home Capable
$7,999.00 · direct from BLUETTI
Last checked 43 days ago. Prices move — check before you buy.
Spec deltas
Both carry the BLUETTI name, but they're built for different buyers. The AC500 + 2×B300K (5,530Wh, 5,000W) and the EP800 + 4×B500 (19,840Wh, 7,600W) come from different product lines with different engineering priorities and a $4,051 price gap. The EP800 + 4×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 EP800 + 4×B500's 7,600W inverter has the headroom for a window AC, a full-size fridge, and power tools. The AC500 + 2×B300K's 5,000W inverter still runs most single appliances; the EP800 + 4×B500's real edge is surge headroom for the biggest motor starts and stacking several heavy loads at once. On stamina, the EP800 + 4×B500 keeps a fridge alive for roughly 112 hours vs the AC500 + 2×B300K's 31 hours. The cost? Portability. At 606.6 lbs, the EP800 + 4×B500 is spread across boxes you site once and leave. The AC500 + 2×B300K at 196.1 lbs is more manageable, though still not light.
Pick the EP800 + 4×B500 if your primary use is 8-hour blackout or remote workday. Go with the AC500 + 2×B300K if you primarily need it for van life daily. Most buyers stop at the sticker price and miss this: over a full lifespan the EP800 + 4×B500 works out to about $0.12/kWh against the AC500 + 2×B300K's $0.2, a gap that compounds in the EP800 + 4×B500'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
- +Costs $4,051 less
- +Lighter by 410.5 lb
Trade-offs
- –Weaker inverter (-2,600W) limits appliance compatibility.
- –Very heavy unit that may be difficult for one person to lift.
BLUETTI EP800 + 4×B500
With a massive 7,600W output (and 0W surge), the EP800 + 4×B500 can run high-wattage appliances like space heaters, hair dryers, and electric grills without tripping. Weighing in at 606.6 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 $0.40 per watt-hour, it's one of the most cost-effective options on the market.
Strengths
- +Larger battery capacity
- +Higher AC output
- +Longer warranty
- +Faster solar charging
Trade-offs
- –Substantially more expensive (+$4,051) than the AC500 + 2×B300K.
- –Significantly heavier (+410.5 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
Scoring these two at a campsite is a category error: the AC500 + 2×B300K at 196.1 lbs is not a take-along — it rolls off a truck bed if it travels at all, and the EP800 + 4×B500 is installed at the electrical panel — it backs up the building and doesn't leave it. The 2,100Wh here is trivial for either — it's the going that doesn't happen. If you need power away from the building, you're shopping the wrong class.
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
EP800 + 4×B500
Both survive the night. The EP800 + 4×B500 finishes at 10% used with 15,219Wh left — 9.3 more nights like it. The AC500 + 2×B300K finishes at 35% with 3,056Wh, 1.9 more nights like it. If your outages tend to run past one evening, that difference is the whole argument between them.
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 cover the night with room to spare and capacity decides nothing. Fan noise would — but neither maker publishes a fan-noise figure, so there's nothing to hold either of them to. Buy on price, weight, and whether you can live with a fan you haven't heard.
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
EP800 + 4×B500
The EP800 + 4×B500 clears the workday at 5% used, banking 15,954Wh — late work, extra calls, or a second laptop charge without arithmetic. The AC500 + 2×B300K at 19% also finishes, with 3,791Wh 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
Neither unit
Scoring these two at a tailgate is a category error: the AC500 + 2×B300K at 196.1 lbs is not a take-along — it rolls off a truck bed if it travels at all, and the EP800 + 4×B500 is installed at the electrical panel — it backs up the building and doesn't leave it. The 670Wh here is trivial for either — it's the going that doesn't happen. If you need power away from the building, you're shopping the wrong class.
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 EP800 + 4×B500 is installed at the electrical panel — it backs up the building and doesn't leave it, so this scenario belongs to the AC500 + 2×B300K by default — and it earns it, covering the 4,685Wh with only 16Wh left — well under half a percent of what the day asks, so it finishes with nothing behind it. Capacity was never the EP800 + 4×B500's problem here; getting to a van build was.
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: EP800 + 4×B500 runs 82.3h vs 22.9h.
$7,999 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 0–1124.3hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–224.9hHigh-Draw Appliances
These reveal the real limitsscale 0–16.9h¹ 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 EP800 + 4×B500, on Power Score margin
These two units are closely matched on individual specs, but our Power Score analysis gives the EP800 + 4×B500 the edge with a composite score of 14,380 vs 5,982.
Today the AC500 + 2×B300K is $3,299, $649 under its typical $3,948. The verdict weighs typical prices, not today's. Prices checked 1 day ago.
Overall score margin: 5,982 vs 14,380 (−140.4%)
List prices as of July 10, 2026. The links below open BLUETTI's current price.
$7,999.00 · direct from BLUETTI
Last checked 43 days ago. Prices move — check before you buy.
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
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 EP800 + 4×B500 rates 3.9/5 (36th percentile of 29 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 AC500 + 2×B300K (196.1 lbs) is spread across its boxes — no single lift, but nothing you reposition on a whim. The EP800 + 4×B500 (606.6 lbs) is a wall-installed system — its weight matters to the installer on day one, then never again.
EP800 + 4×B500: Fixed Capacity
The EP800 + 4×B500 is sealed at 19,840Wh — a complete unit, and already larger than the AC500 + 2×B300K's 5,530Wh. By contrast the AC500 + 2×B300K can add expansion batteries, but that only pulls ahead if you'd grow past 19,840Wh.
Warranty: 10 Years vs 4
The EP800 + 4×B500 is covered for 10 years against the AC500 + 2×B300K's 4 years. An underrated factor if you're keeping this unit for years.
Full record above — the Test Desk pick is the EP800 + 4×B500.
Check EP800 + 4×B500 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.
Analyst note
The AC500 + 2×B300K is cheaper to buy, but the EP800 + 4×B500 is cheaper to own. At $0.12/kWh over its lifetime vs $0.2/kWh, the EP800 + 4×B500's higher cycle life and capacity make each dollar go further over the years. One thing to know reading the table: both carry the same 3,500-cycle rating, so the lifetime rows are sticker price and capacity in disguise — the wear horizon is identical and decides nothing here.
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.
EP800 + 4×B500
FIXED CAPACITYFixed at 19,840Wh — a sealed, complete system rather than a starting point. There's no expansion port, so that figure is the ceiling: check it against your longest unplugged stretch before you buy.
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.
Realistic full solar rechargeat 70% of rated panel output — see methodology
Analyst note
Don't read the AC500 + 2×B300K's expandability as a straight win here: it starts at 5,530Wh, below the EP800 + 4×B500's 19,840Wh, so a first expansion battery largely buys back capacity the EP800 + 4×B500 already includes. It only pulls ahead if you'd grow past 19,840Wh — short of that, the EP800 + 4×B500's larger fixed capacity is the simpler value.
The Bottom Line
The full picture comes down to this. The EP800 + 4×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 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 EP800 + 4×B500 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 EP800 + 4×B500 worth $4,051 more than the AC500 + 2×B300K?
The short answer: yes, if you'll actually use the extra capability. The EP800 + 4×B500 costs $4,051 more, but that premium buys you 14,310Wh more battery capacity (that's 81 extra hours of running a mini-fridge); 2,600W higher AC output (opening the door to more demanding appliances); 6,000W faster solar charging for quicker off-grid recovery. On a cost-per-watt-hour basis, you're paying $0.40/Wh vs $0.71/Wh. Factor in cycle life and the math flips: the EP800 + 4×B500 costs $0.12/kWh over its lifetime vs $0.20/kWh. The "expensive" unit is actually cheaper to own. For regular use, we'd pay the premium.
How does the 14,310Wh capacity difference actually affect daily use?
The EP800 + 4×B500's 19,840Wh battery keeps a mini-fridge running for roughly 112 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 EP800 + 4×B500 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 EP800 + 4×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 EP800 + 4×B500, or is the AC500 + 2×B300K the only portable option?
Neither is "portable" in any hiking sense. The AC500 + 2×B300K (196.1 lbs) and the EP800 + 4×B500 (606.6 lbs) are both appliances you place and leave. The 410.5-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 EP800 + 4×B500 accepts 9,000W vs the AC500 + 2×B300K's 3,000W 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 3.1 hours for the EP800 + 4×B500 and 2.6 hours for the AC500 + 2×B300K. That gap widens on cloudy days, when the EP800 + 4×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 EP800 + 4×B500's advantage is substantial.
Does the AC500 + 2×B300K's expandability make it the safer long-term buy?
Not necessarily. The AC500 + 2×B300K can add BLUETTI batteries, but it starts at 5,530Wh — below the EP800 + 4×B500's sealed 19,840Wh. A first expansion battery mostly buys back capacity the EP800 + 4×B500 already gives you out of the box; expandability only pulls ahead if you expect to grow past 19,840Wh. If you don't, the EP800 + 4×B500's larger fixed capacity is the simpler, complete package — not a dead end, just already the bigger battery.
Bottom line: should I buy the AC500 + 2×B300K or the EP800 + 4×B500?
We'd pay the premium for the EP800 + 4×B500. 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 AC500 + 2×B300K is still solid if budget is the priority, but the EP800 + 4×B500 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×B300K
$3,299.00
$3,299.00 · direct from BLUETTI
down from $3,948 · 16% below usual
Last checked 1 day ago. Prices move — check before you buy.
BLUETTI EP800 + 4×B500Pick
$7,999.00
$7,999.00 · direct from BLUETTI
Last checked 43 days ago. Prices move — check before you buy.
Prices may vary by retailer and are subject to change.