Head-to-head test
EcoFlow DELTA Pro Ultra + 1 Battery vs BLUETTI Apex 300 + 2×B500K
Real-world runtimes, scenario verdicts, and ownership costs compared — which wins for your use case.
Full profiles: EcoFlow DELTA Pro Ultra + 1 Battery → · BLUETTI Apex 300 + 2×B500K →
Written by Gunner GustafsonUpdated
Whole-Home Backup Tester, Station Arena Test Desk
$5,999.00 · direct from EcoFlow
Last checked 8 hours ago. Prices move — check before you buy.
$4,999.00 · direct from BLUETTI
down from $5,399 · 7% below usual
Last checked 8 hours ago. Prices move — check before you buy.
Spec deltas
The EcoFlow DELTA Pro Ultra + 1 Battery and BLUETTI Apex 300 + 2×B500K compete for the same spot. Similar LiFePO4 capacity, similar price range, different brands behind them. In this matchup, ecosystem, app quality, and warranty reputation matter as much as raw specs. We'd buy the Apex 300 + 2×B500K.
What the spec gap means in practice: the Apex 300 + 2×B500K's 3,840W inverter has the headroom for a window AC, a full-size fridge, and power tools. The DELTA Pro Ultra + 1 Battery's 7,200W inverter still runs most single appliances; the Apex 300 + 2×B500K's real edge is surge headroom for the biggest motor starts and stacking several heavy loads at once. On stamina, the Apex 300 + 2×B500K keeps a fridge alive for roughly 74 hours vs the DELTA Pro Ultra + 1 Battery's 70 hours.
Pick the Apex 300 + 2×B500K if you want the unit that wins the head-to-head on balance. Go with the DELTA Pro Ultra + 1 Battery if you primarily need it for cpap overnight. Most buyers stop at the sticker price and miss this: over a full lifespan the Apex 300 + 2×B500K works out to about $0.07/kWh against the DELTA Pro Ultra + 1 Battery's $0.12, a gap that compounds in the Apex 300 + 2×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 Pro Ultra + 1 Battery
With a massive 7,200W output (and 10,800W surge), the DELTA Pro Ultra + 1 Battery can run high-wattage appliances like space heaters, hair dryers, and electric grills without tripping. Weighing in at 293.6 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 $0.49 per watt-hour, it's one of the most cost-effective options on the market.
Strengths
- +Higher AC output
- +Longer warranty
- +Faster solar charging
Trade-offs
- –Significantly heavier (+11.4 lbs), making it harder to move.
- –Very heavy unit that may be difficult for one person to lift.
- –Shorter-lived battery — rated for 4,000 charge cycles vs the Apex 300 + 2×B500K's 6,000, so it wears out sooner.
BLUETTI Apex 300 + 2×B500K
With a massive 3,840W output (and 7,680W surge), the Apex 300 + 2×B500K can run high-wattage appliances like space heaters, hair dryers, and electric grills without tripping. Weighing in at 282.2 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
- +Costs $600 less
- +Lighter by 11.4 lb
- +Larger battery capacity
- +Rated for 6,000 charge cycles — much longer battery lifespan
Trade-offs
- –Weaker inverter (-3,360W) limits appliance compatibility.
- –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: neither travels — the DELTA Pro Ultra + 1 Battery is 293.6 lbs and the Apex 300 + 2×B500K 282.2 lbs, and at those weights they roll off a truck bed if they go anywhere at all. 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
Either unit
Both survive the blackout with similar margin, and both list a UPS mode — compare their stated switchover classes, and remember those are manufacturer ratings, not measurements.
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
DELTA Pro Ultra + 1 Battery
A CPAP is about 40W for eight hours, so both of these cover the night several times over — capacity isn't the question here, and the percentages are a formality. What matters is the box next to your pillow, and the only published difference is a rating: the DELTA Pro Ultra + 1 Battery is rated 30dB against the Apex 300 + 2×B500K's 45dB. Each is the maker's own published rating, and the makers do not measure the same way, some quoting a best case and some a figure under load, so neither number describes a 40W draw and the two are not really comparable. Treat them as a reason to look for hands-on reports before either one goes next to a bed, not as a difference you can count on hearing.
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 strain, and their USB-C output is a wash — pick on weight, ports, or price.
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: neither travels — the DELTA Pro Ultra + 1 Battery is 293.6 lbs and the Apex 300 + 2×B500K 282.2 lbs, and at those weights they roll off a truck bed if they go anywhere at all. 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
Either unit
Both units cover a full day of van life, but barely — sustaining it is a solar question, and the DELTA Pro Ultra + 1 Battery accepts more input (5,600W vs 2,400W) for faster recovery between days.
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: Apex 300 + 2×B500K runs 53.9h vs 51h.
$5,399 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 0–736.9hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–147.4hHigh-Draw Appliances
These reveal the real limitsscale 0–11.1h¹ 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 + 2×B500K
The Apex 300 + 2×B500K takes it on balance: 716.8Wh more capacity than the DELTA Pro Ultra + 1 Battery, against 3,360W less output. It costs $600 less as well and weighs 11.4 lbs less, which makes it the easier call.
Today the Apex 300 + 2×B500K is $4,999, $400 under its typical $5,399. The verdict weighs typical prices, not today's. Prices checked 8 hours ago.
Overall score margin: 10,756 vs 9,821 (+9.5%)
List prices as of July 10, 2026. The links below open EcoFlow's and BLUETTI's current prices.
$4,999.00 · direct from BLUETTI
down from $5,399 · 7% below usual
Last checked 8 hours ago. Prices move — check before you buy.
or check the DELTA Pro Ultra + 1 Battery price$5,999.00 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
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 Pro Ultra + 1 Battery rates 3.7/5 (25th percentile of 29 Whole-Home / Off-Grid-class units), and Apex 300 + 2×B500K rates 3.5/5 (14th 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 Apex 300 + 2×B500K (282.2 lbs) is spread across its boxes — no single lift, but nothing you reposition on a whim. The DELTA Pro Ultra + 1 Battery (293.6 lbs) is spread across its boxes — no single lift, but nothing you reposition on a whim. That's an 11 lb difference.
Apex 300 + 2×B500K: 45dB Published
45dB is about as loud as a running refrigerator. The DELTA Pro Ultra + 1 Battery is rated 30dB — lower, but published by a different maker measuring its own way, so the two figures are not a like-for-like gap. For most people, fan noise around 45dB and up is where sleep starts to suffer.
Surge Power: Ratio and Ceiling Disagree
The Apex 300 + 2×B500K holds the higher surge-to-continuous ratio (2× vs 1.5×), but the DELTA Pro Ultra + 1 Battery holds the higher absolute surge ceiling — 10,800W against 7,680W. These measure different things. The ratio says how much headroom an inverter keeps above its own rating; the ceiling says how big a startup spike it can actually swallow. A motor draws a number of watts at switch-on, not a multiple of someone else's rating, so on raw starting ability the DELTA Pro Ultra + 1 Battery is the stronger unit here — while the Apex 300 + 2×B500K is the one running further below its own limit at steady state.
UPS Switchover: 0ms-rated vs ≤10ms
Both list a UPS mode, at different rated speeds. The DELTA Pro Ultra + 1 Battery is rated 0ms — a no-break design on paper, which is the maker's classification rather than a stopwatch result. The Apex 300 + 2×B500K is rated ≤10ms — quick enough on paper that desktop PCs and routers should ride through, treating that as the rating it is. 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 5
The DELTA Pro Ultra + 1 Battery is covered for 10 years against the Apex 300 + 2×B500K's 5 years. The Apex 300 + 2×B500K's figure is a maximum rather than a guarantee — it depends on buying direct from BLUETTI or registering the unit, since reseller purchases carry a shorter term. An underrated factor if you're keeping this unit for years.
Battery Lifespan in Real Years
The Apex 300 + 2×B500K is rated for 6,000 cycles vs 4,000. In real life: at daily use, that's 16.4 vs 11 years. At weekend use (twice a week), it's 58 vs 38 years. 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 Apex 300 + 2×B500K.
Check Apex 300 + 2×B500K price →or check the DELTA Pro Ultra + 1 Battery 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 Apex 300 + 2×B500K wins on both sticker price and long-term value. At $0.07/kWh over its lifetime, it's meaningfully cheaper to own. Clear value winner.
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. At the very top of the range, the DELTA Pro Ultra platform stacks batteries and inverters into whole-home backup — a flagship path, not a line-wide feature.
Worth knowing
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 portable (Apex 300, 2764.8Wh). 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
Among the best capacity-to-price ratios available — several Elite and Apex units are the lowest $/Wh in the catalog. Widest product diversity including industry-firsts like sodium-ion cold-weather units and dual solar+alternator vehicle hubs. LFP across the rest of the range, though rated cycle life spans 2,500 (EB3A) to 6,000, and it varies WITHIN the Elite range rather than tracking it — the Elite 300 and Elite 200 V2 are rated 6,000 while the Elite 30 V2, Elite 10 Mini, Elite 320 and Elite 400 are rated 3,000+ and the Elite 100 V2 4,000+, so check the specific model. 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 Pro Ultra + 1 Battery
EXPANDABLESupports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 12,288Wh.
Accepts up to 5,600W 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 EcoFlow-specific. You're investing in the EcoFlow ecosystem.
Apex 300 + 2×B500K
EXPANDABLESupports BLUETTI expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 13,005Wh.
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 DELTA Pro Ultra + 1 Battery's higher solar ceiling (5,600W vs 2,400W) 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 + 2×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 Pro Ultra + 1 Battery wins in the scenarios that match your life, it's the right choice regardless of aggregate scores.
If neither the DELTA Pro Ultra + 1 Battery nor the Apex 300 + 2×B500K 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 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 DELTA Pro Ultra + 1 Battery worth $600 more than the Apex 300 + 2×B500K?
The short answer: yes, if you'll actually use the extra capability. The DELTA Pro Ultra + 1 Battery costs $600 more, but that premium buys you 3,360W higher AC output (opening the door to more demanding appliances); 3,200W faster solar charging for quicker off-grid recovery. On a cost-per-watt-hour basis, you're paying $0.49/Wh vs $0.42/Wh. For regular use, we'd pay the premium.
How does the 716.8Wh capacity difference actually affect daily use?
The Apex 300 + 2×B500K's 13,004.8Wh battery keeps a mini-fridge running for roughly 74 hours vs the DELTA Pro Ultra + 1 Battery's 70 hours. Both can handle a full 8-hour blackout setup (fridge + router + lights + phone charging ≈ 1,645Wh), but the Apex 300 + 2×B500K 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 Apex 300 + 2×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 DELTA Pro Ultra + 1 Battery, or is the Apex 300 + 2×B500K the only portable option?
Neither is "portable" in any hiking sense. The Apex 300 + 2×B500K (282.2 lbs) and the DELTA Pro Ultra + 1 Battery (293.6 lbs) are both appliances you place and leave. The 11.4-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 DELTA Pro Ultra + 1 Battery accepts 5,600W vs the Apex 300 + 2×B500K's 2,400W 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 DELTA Pro Ultra + 1 Battery and 7.7 hours for the Apex 300 + 2×B500K. That gap widens on cloudy days, when the DELTA Pro Ultra + 1 Battery'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 DELTA Pro Ultra + 1 Battery's advantage is substantial.
"6,000 vs 4,000 cycles" — what does that actually mean for me?
In real years: the Apex 300 + 2×B500K (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 DELTA Pro Ultra + 1 Battery (4,000 cycles): 11.0 years daily, 38 years weekends, or 167 years twice-monthly. What most people miss: hitting the cycle limit doesn't kill your battery. Capacity drops to about 80%. Your 13,004.8Wh unit becomes a ~10,404Wh unit. Still very usable. For weekend users, both batteries will outlast the warranty by years.
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 Pro Ultra + 1 Battery or the Apex 300 + 2×B500K?
We'd buy the Apex 300 + 2×B500K. Cheaper and more capable. That combination is rare. The DELTA Pro Ultra + 1 Battery doesn't offer a compelling reason to spend more unless you specifically need a feature unique to the EcoFlow ecosystem (expansion batteries, app integrations). Otherwise, clear call.
Brand matchup
EcoFlow vs BLUETTI: measured across every matchup →Related comparisons
Where to buy
EcoFlow DELTA Pro Ultra + 1 Battery
$5,999.00
$5,999.00 · direct from EcoFlow
Last checked 8 hours ago. Prices move — check before you buy.
BLUETTI Apex 300 + 2×B500KPick
$4,999.00
$4,999.00 · direct from BLUETTI
down from $5,399 · 7% below usual
Last checked 8 hours ago. Prices move — check before you buy.
Prices may vary by retailer and are subject to change.