Head-to-head test
EcoFlow DELTA 3 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
EcoFlow
DELTA 3
3,196Power Score · Appliance Class
$549.00 list · direct from EcoFlow
BLUETTI
Apex 300 + B500K
7,760Power Score · The AC & Fridge Zone
$3,299.00 list · direct from BLUETTI
Spec deltas
The EcoFlow DELTA 3 (1,024Wh) and BLUETTI Apex 300 + B500K (7,885Wh) sit in different weight classes. The real question: do your power needs justify the larger unit, or would you be overpaying for capacity that sits unused? The Apex 300 + B500K 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 Apex 300 + B500K's 3,840W inverter has the headroom for a window AC, a full-size fridge, and power tools. The DELTA 3's 1,800W inverter still runs most single appliances; the Apex 300 + B500K's real edge is surge headroom for the biggest motor starts and stacking several heavy loads at once. On stamina, the Apex 300 + B500K keeps a fridge alive for roughly 45 hours vs the DELTA 3's 6 hours. The cost? Portability. At 183 lbs, the Apex 300 + B500K is a two-person lift you set down once and leave. The DELTA 3 at 27 lbs is something one person can actually carry.
Pick the Apex 300 + B500K if your primary use is weekend camping or 8-hour blackout. Go with the DELTA 3 if you want the option to add expansion batteries later. Most buyers stop at the sticker price and miss this: over a full lifespan the Apex 300 + B500K works out to about $0.12/kWh against the DELTA 3's $0.18, a gap that compounds in the Apex 300 + B500K'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.
EcoFlow DELTA 3
The 1,800W inverter handles most daily devices like laptops, blenders, and TVs, but will struggle with heating elements that require over 1500W. A standout feature is the value proposition: at roughly $0.54 per watt-hour, it's one of the most cost-effective options on the market.
Strengths
- +Costs $2,750 less
- +Lighter by 156 lb
Trade-offs
- –Weaker inverter (-2,040W) limits appliance compatibility.
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 $0.42 per watt-hour, it's one of the most cost-effective options on the market.
Strengths
- +Larger battery capacity
- +Higher AC output
- +Faster solar charging
Trade-offs
- –Substantially more expensive (+$2,750) than the DELTA 3.
- –Significantly heavier (+156 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
Apex 300 + B500K
The DELTA 3 runs out of juice. It only has 870Wh usable, but this scenario needs 2,100Wh. The Apex 300 + B500K covers it and still has 307h 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
Apex 300 + B500K
The DELTA 3 runs out of juice. It only has 870Wh usable, but this scenario needs 1,645Wh. The Apex 300 + B500K covers it and still has 337h 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
Apex 300 + B500K
Both are massively overpowered for CPAP. You're using 37% or less. Save $2,750 and buy the cheaper unit; the extra capacity is wasted on a 40W medical device. Instead, invest in a second battery for multi-night camping 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
Apex 300 + B500K
The DELTA 3 runs out of juice. It only has 870Wh usable, but this scenario needs 910Wh. The Apex 300 + B500K covers it and still has 386h 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
Apex 300 + B500K
Both handle it, but neither is stressed. Tailgating is a light load. The Apex 300 + B500K's extra margin is nice but not decisive here. Consider weight instead: you're carrying this to a parking lot, and 156 lbs makes a real difference when loading up.
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 DELTA 3 runs out of juice. It only has 870Wh usable, but this scenario needs 4,685Wh. The Apex 300 + B500K covers it and still has 134h 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: Apex 300 + B500K runs 32.7h vs 4.2h.
$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 0–446.8hComfort & 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, on Power Score margin
These two units are closely matched on individual specs, but our Power Score analysis gives the Apex 300 + B500K the edge with a composite score of 7,760 vs 3,196.
Overall score margin: 3,196 vs 7,760 (−142.8%)
List prices as of July 10, 2026. The links below open EcoFlow's and BLUETTI's current prices.
$3,299.00 list · direct from BLUETTI
or check the DELTA 3 price$549.00 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): UPS, RV Living, CPAP, Solar Generator, Tailgating, 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, DELTA 3 rates 4.3/5 (61st percentile of 24 Everyday-class units), and Apex 300 + B500K rates 3.6/5 (19th percentile of 17 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.
Apex 300 + B500K: 183 lbs Is a Commitment
At 183 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.
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.
Warranty Value Comparison
The DELTA 3 gives you 9.1 years of warranty per $1,000 spent, vs the Apex 300 + B500K's 1.5 years. That's 6× more coverage per dollar. An underrated factor if you're keeping this unit for years.
Full record above — the Test Desk pick is the Apex 300 + B500K.
Check Apex 300 + B500K price →or check the DELTA 3 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 DELTA 3 is cheaper to buy, but the Apex 300 + B500K is cheaper to own. At $0.12/kWh over its lifetime vs $0.18/kWh, the Apex 300 + B500K's higher cycle life and capacity make each dollar go further over the years.
Brand trust
EcoFlow
Ecosystem
Largest in portable power — 12-15 models across DELTA Pro, DELTA 3, and RIVER 3 series, plus solar panels and smart home panels
Support
US-based phone/email/chat support (1-800-368-8604). Experiences are polarized — many report hassle-free prepaid-label replacements, but others report long waits and refurbished units sent for new claims. Pro tip: buying from Costco or Amazon gives you a stronger return safety net.
Community
Largest community in the space — Reddit r/Ecoflow_community (~31K members), multiple Facebook groups, and an official community forum
App experience
Rated 4.6/5 iOS (~8,400 ratings) · 4.2/5 Android (~17,000 ratings)
Unique strength
Fastest-charging technology (X-Stream), deepest product ecosystem, and most active innovation cadence. Supports up to 180kWh modular expansion with DELTA Pro Ultra X.
Worth knowing
The Oct 2025 DELTA Max 2000 recall (overheating/fire risk, 6 incidents) is worth noting. Also tested subscription paywalls for advanced app features in early 2025 before community backlash paused the plan. No parts or service offered out of warranty.
BLUETTI
Ecosystem
One of the broadest lineups — 15-20+ models from budget (AC2A) to flagship (Apex 300, 3072Wh). Includes specialized products: vehicle solar hubs, sodium-ion cold-weather units, and balcony storage systems.
Support
The most inconsistent support in the space. Heavily email-based with China timezone delays. Some users get smooth, efficient service; others report weeks of troubleshooting runarounds, being offered discounts on new units instead of repairs, and confusing third-party purchase claim processes. Buying direct from Bluetti's website tends to produce better support outcomes.
Community
Active and growing — Reddit r/bluetti has a dedicated community. Second-largest after EcoFlow in engagement.
App experience
Rated 4.5/5 iOS and Android — tied for best app experience in the category. V3.0 UI redesign was well-received.
Unique strength
Best capacity-to-price ratio in the market — strongest value proposition overall. Widest product diversity including industry-firsts like sodium-ion cold-weather units and dual solar+alternator vehicle hubs. Full LFP standardization across lineup (3,500-6,000+ cycles). Dual-voltage (120V/240V) in flagships.
Worth knowing
Customer support inconsistency is the #1 risk factor. Older/discontinued units may become unrepairable — no spare parts policy for some models. Some reports of erratic communication from support agents.
Analyst note
EcoFlow positions itself as a mid-to-premium brand with stronger support infrastructure, while BLUETTI competes on value. The question is whether the EcoFlow ecosystem and support premium is worth it for your use case.
Growth path
DELTA 3
EXPANDABLESupports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 1,024Wh.
Accepts up to 500W of solar. Suitable for a 1-2 panel setup.
Generous port selection supports complex multi-device setups.
Expansion batteries are EcoFlow-specific. You're investing in the EcoFlow 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, but the Apex 300 + B500K's higher solar ceiling (2,400W vs 500W) gives it the stronger off-grid growth path — more panels can feed a bigger bank as it grows.
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 DELTA 3 wins in the scenarios that match your life, it's the right choice regardless of aggregate scores.
If neither the DELTA 3 nor the Apex 300 + B500K 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 EcoFlow and 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 Apex 300 + B500K worth $2,750 more than the DELTA 3?
The short answer: yes, if you'll actually use the extra capability. The Apex 300 + B500K costs $2,750 more, but that premium buys you 6,860.8Wh more battery capacity (that's 39 extra hours of running a mini-fridge); 2,040W 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; 1,900W faster solar charging for quicker off-grid recovery. On a cost-per-watt-hour basis, you're paying $0.42/Wh vs $0.54/Wh. Factor in cycle life and the math flips: the Apex 300 + B500K costs $0.12/kWh over its lifetime vs $0.18/kWh. The "expensive" unit is actually cheaper to own. For regular use, we'd pay the premium.
How does the 6,860.8Wh 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 DELTA 3's 6 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 Apex 300 + B500K handles it while the DELTA 3 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 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 Apex 300 + B500K, or is the DELTA 3 the only portable option?
At 27 lbs, the DELTA 3 is manageable for one person over short distances: parking lot to campsite, trunk to tailgate. The Apex 300 + B500K at 183 lbs? You'll want a buddy, a wagon, or wheels. For reference, 183 lbs is about the weight of a bag of concrete. If your use case involves any carrying, the DELTA 3 wins decisively.
How fast can each unit recharge from solar panels in real conditions?
On paper, the Apex 300 + B500K accepts 2,400W vs the DELTA 3's 500W 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 4.7 hours for the Apex 300 + B500K and 2.9 hours for the DELTA 3. That gap widens on cloudy days, when the Apex 300 + B500K'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 Apex 300 + B500K's advantage is substantial.
Is EcoFlow or BLUETTI more reliable for long-term ownership?
Both brands have strengths and trade-offs. EcoFlow: Mixed. 2-5 years depending on model (DELTA Pro Ultra line gets 10 years). Some users report smooth claims; others report runarounds. Register your product to extend coverage. BLUETTI: 2-6 years depending on model (up to 10 years on home backup systems). Response times vary significantly. Some reports of units being deemed unrepairable with no parts available for older models. One piece of advice from the power station community: regardless of brand, buy from Costco or Amazon. Their return policies provide a safety net that manufacturer warranties alone can't match, especially for a product you'll rely on in emergencies. Both brands use LFP (lithium iron phosphate) batteries in their current lineup, the most proven chemistry for longevity and safety.
Bottom line: should I buy the DELTA 3 or the Apex 300 + B500K?
We'd pay the premium for the Apex 300 + B500K. 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 DELTA 3 is still solid if budget is the priority, but the Apex 300 + B500K 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
EcoFlow DELTA 3
$549.00
$549.00 list · direct from EcoFlow
BLUETTI Apex 300 + B500KPick
$3,299.00
$3,299.00 list · direct from BLUETTI
Prices may vary by retailer and are subject to change.