EcoFlow DELTA 3 Ultra Plus vs BLUETTI Apex 300 + B300K
The EcoFlow DELTA 3 Ultra Plus (3,072Wh) and BLUETTI Apex 300 + B300K (5,530Wh) 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 + B300K has a slight edge, but the margin is close enough that your use case should break the tie.
The Apex 300 + B300K's 5,530Wh keeps a fridge going for 31 hours. The DELTA 3 Ultra Plus's 3,072Wh manages 17 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 DELTA 3 Ultra Plus does the job at 77.2 lbs and $1,499 — no overkill, no regret.
Pick the Apex 300 + B300K if your primary use is weekend camping or 8-hour blackout. Go with the DELTA 3 Ultra Plus if you need the heavier-duty specs for demanding loads. Most buyers overlook this: the DELTA 3 Ultra Plus costs ~$0.12/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.
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The Breakdown
What each unit does well, where it falls short, and the trade-offs that matter.
DELTA 3 Ultra Plus Analysis
With a massive 3,600W output (and 7,200W surge), the DELTA 3 Ultra Plus can run high-wattage appliances like space heaters, hair dryers, and electric grills without tripping. Weighing in at 77.2 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 $0.49 per watt-hour, it's one of the most cost-effective options on the market.
Strengths
- Save $1,100 vs Competitor
- 71.6 lbs Lighter
Trade-offs & Considerations
- No major technical downsides compared to rival.
Apex 300 + B300K Analysis
With a massive 3,840W output (and 7,680W surge), the Apex 300 + B300K can run high-wattage appliances like space heaters, hair dryers, and electric grills without tripping. Weighing in at 148.8 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 $0.47 per watt-hour, it's one of the most cost-effective options on the market.
Strengths
- Larger Battery Capacity
- Higher AC Output Power
- Faster Solar Charging
Trade-offs & Considerations
- Substantially more expensive (+$1,100) than the DELTA 3 Ultra Plus.
- Significantly heavier (+71.6 lbs), making it harder to move.
- Very heavy unit that may be difficult for one person to lift.
What the Specs Don't Tell You
Hidden gotchas and advantages we spotted that you won't find on the product page.
Weight Reality Check
Watch outNeither unit is grab-and-go. The DELTA 3 Ultra Plus (77.2 lbs) is manageable solo but heavier than a large checked suitcase. The Apex 300 + B300K (148.8 lbs) is firmly a two-person lift. It goes where you put it and stays there. That's a 72 lb difference, which you'll feel every time you relocate.
Apex 300 + B300K: 45dB Under Load
Note45dB 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
NoteThe DELTA 3 Ultra Plus gives you 3.3 years of warranty per $1,000 spent, vs the Apex 300 + B300K's 1.9 years. That's 1.7× more coverage per dollar. An underrated factor if you're keeping this unit for years.
Your Life, Your Pick
We ran the math on six real-world scenarios. Here's which unit survives your actual life.
Weekend Camping
2 nights
Two nights off-grid with essential comfort
The DELTA 3 Ultra Plus cuts it close at 80%. One cold night or an unexpected device and you're rationing power. The Apex 300 + B300K finishes at 45%, leaving real headroom for spontaneous use. If you camp in variable weather, that buffer keeps you relaxed instead of checking your battery app every 20 minutes.
8-Hour Blackout
8 hours
Keep the essentials running through a night without power
Both survive, but the Apex 300 + B300K finishes at just 35% used. That's enough reserve for a second blackout night. The DELTA 3 Ultra Plus at 63% leaves little margin if the outage runs longer than expected. In storm-prone areas, that remaining capacity is insurance.
CPAP Overnight
8 hours
Sleep therapy without interruption — the #1 medical use case
Both are wildly overqualified for CPAP. You're using 12% 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.
Remote Workday
8 hours
Full work day off-grid without power anxiety
The Apex 300 + B300K gives you a comfortable buffer at 19%. Enough to work late, join extra video calls, or charge a second device without worry. The DELTA 3 Ultra Plus at 35% works but leaves less room for the unexpected. For daily remote work, that peace of mind matters.
Tailgate Party
4 hours
Game day power for the crew
Both handle it, but neither is stressed. Tailgating is a light load. The Apex 300 + B300K's extra margin is nice but not decisive here. Consider weight instead: you're carrying this to a parking lot, and 72 lbs makes a real difference when loading up.
Van Life Daily
24 hours
A full day of mobile living — the ultimate endurance test
The DELTA 3 Ultra Plus runs out of juice. It only has 2,611Wh usable, but this scenario needs 4,685Wh. The Apex 300 + B300K covers it and still has 1h of phone charging left over.
Will It Power Your Gear?
Real-world runtime estimates for common appliances. Based on 85% inverter efficiency — actual results vary with temperature and load cycling.
Essentials
The basics you need running| Appliance | DELTA 3 Ultra Plus | Apex 300 + B300K |
|---|---|---|
😴 CPAP Machine 40W draw | 65.3h8 full nights | ★117.5h14 full nights |
📱 Phone Charger 15W draw | 174.1h | ★313.3h |
📡 Router + Modem 20W draw | 130.6h | ★235h |
💡 LED Lights (4 bulbs) 40W draw | 65.3h | ★117.5h |
💻 Laptop (Working) 60W draw | 43.5h | ★78.3h |
Comfort & Convenience
Makes off-grid life actually enjoyable| Appliance | DELTA 3 Ultra Plus | Apex 300 + B300K |
|---|---|---|
🌀 Box Fan 75W draw | 34.8h | ★62.7h |
📺 LED TV (55") 80W draw | 32.6h | ★58.8h |
🧊 Mini-Fridge 150W draw | 17.4h | ★31.3h |
🛏️ Electric Blanket 200W draw | 13.1h1 full night | ★23.5h2 full nights |
High-Draw Appliances
These reveal the real limits| Appliance | DELTA 3 Ultra Plus | Apex 300 + B300K |
|---|---|---|
☕ Coffee Maker 1000W draw | 2.6h | ★4.7h |
🍽️ Microwave 1200W draw | 2.2h | ★3.9h |
🔥 Space Heater 1500W draw | 1.7h | ★3.1h |
Runtime = (capacity × 0.85) ÷ appliance watts. Actual runtime varies with battery age, temperature, and simultaneous loads.
Expert Verdict
Apex 300 + B300K Edges Ahead on Power Score
These two units are closely matched on individual specs, but our Power Score analysis gives the Apex 300 + B300K the edge with a composite score of 6,552 vs 5,220.
Based on 18+ spec comparisons and real-world performance data
Power Score Breakdown
How each unit performs across our segmented benchmarks
| Benchmark | DELTA 3 Ultra Plus | Apex 300 + B300K |
|---|---|---|
| Overall Power Score | 5,220The AC & Fridge Zone | ★6,552The AC & Fridge Zone |
| UPSResponse & Reliability | 4,453 | ★4,976 |
| RV LivingEnergy Density & Output | 5,124 | ★6,541 |
| Home BackupCapacity & Resilience | 5,227 | ★6,567 |
| CPAPSleep Therapy Reliability | 4,198 | ★4,489 |
| Solar GeneratorSolar Input & Efficiency | 4,823 | ★6,167 |
| TailgatingOutlets & Portability | 4,493 | — |
| Food TruckSustained Heavy Output | 5,015 | ★6,112 |
Power Score is our proprietary benchmark calculated from 14 spec dimensions. Higher = better. "—" means the product doesn't meet the minimum threshold for that bench.
Full Specification Breakdown
| Feature | DELTA 3 Ultra Plus | Apex 300 + B300K |
|---|---|---|
| Price | ★$1,499.00 | $2,599.00 |
| Capacity (Wh) | 3072 | ★5529.6 |
| Output (W) | 3600 | ★3840 |
| Surge Peak | 7200W | ★7680W |
| AC Outlets | 6 | 6 |
| USB-C Charging Outputs | 100W | 100W |
| Solar Input (W) | 1600 | ★2400 |
| Weight (lbs) | ★77.2 | 148.8 |
| UPS | Yes (10ms) | Yes (<10ms) |
| Charging Cycles | ★4000 | 3500+ |
| Warranty (Years) | 5 | 5 |
| Battery Expansion Feasibility | Yes | Yes |
| App Control | Yes | Yes |
| $/Watt Hour | $.49 | ★$.47 |
| Noise Level (db) | ★30 | 45 |
| Solar Input Type | ★XT60 | MC4 |
| USB-A Ports | 2 | 2 |
| USB-C Ports | 2 | 2 |
| Cost per Wh (calculated) | $0.49/Wh | ★$0.47/Wh |
Beyond the Specs: Owning It
What happens after you click “Buy” — reliability, brand trust, growth potential, and true cost of ownership.
Lifetime Value
DELTA 3 Ultra Plus
Battery lifespan: 11yr daily · 38.5yr weekends · 76.9yr weekly
Apex 300 + B300K
Battery lifespan: 9.6yr daily · 33.7yr weekends · 67.3yr weekly
Both units have similar long-term ownership costs ($0.12/kWh vs $0.13/kWh). The price difference is what you see on the sticker — neither is a hidden bargain or rip-off.
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
Varies — check manufacturer website for full product lineup
Support
Limited data available — check recent reviews and community forums
Community
Smaller community — fewer independent reviews and user reports
App Experience
Rated Not rated
Unique Strength
Check manufacturer website for differentiators
Worth Knowing
Less established brand — fewer long-term reliability reports available
EcoFlow and BLUETTI are close competitors. Both have established support channels and growing ecosystems. Compare their specific warranty terms and community size for your peace of mind.
Growth Path
DELTA 3 Ultra Plus
✓ ExpandableSupports expansion batteries from EcoFlow. You can increase capacity without replacing the base unit. A significant long-term advantage.
Accepts up to 1,600W of solar. Enough for a serious multi-panel array.
Generous port selection supports complex multi-device setups.
Expansion batteries are EcoFlow-specific. You're investing in the EcoFlow ecosystem.
Apex 300 + B300K
✓ ExpandableSupports expansion batteries from BLUETTI. You can increase capacity without replacing the base unit. A significant long-term advantage.
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.
Both units support expansion, but the Apex 300 + B300K's higher solar ceiling (2,400W vs 1,600W) gives it a stronger off-grid growth path. More solar input means you can add panels as your setup grows.
The Bottom Line
The full picture comes down to this. The Apex 300 + 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 DELTA 3 Ultra Plus wins in the scenarios that match your life, it's the right choice regardless of aggregate scores.
If neither the DELTA 3 Ultra Plus nor the Apex 300 + B300K 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
DELTA 3 Ultra Plus vs Apex 300 + B300K — answered by our testing team.
Q.Is the Apex 300 + B300K worth $1,100 more than the DELTA 3 Ultra Plus?
The short answer: yes, if you'll actually use the extra capability. The Apex 300 + B300K costs $1,100 more, but that premium buys you 2,457.6Wh more battery capacity (that's 14 extra hours of running a mini-fridge); 800W faster solar charging for quicker off-grid recovery. On a cost-per-watt-hour basis, you're paying $0.47/Wh vs $0.49/Wh. For regular use, we'd pay the premium.
Q.How does the 2,457.6Wh capacity difference actually affect daily use?
The Apex 300 + B300K's 5,529.6Wh battery keeps a mini-fridge running for roughly 31 hours vs the DELTA 3 Ultra Plus's 17 hours. Both can handle a full 8-hour blackout setup (fridge + router + lights + phone charging ≈ 1,645Wh), but the Apex 300 + B300K 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 + 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.
Q.Can I actually carry the Apex 300 + B300K, or is the DELTA 3 Ultra Plus the only portable option?
Neither is "portable" in any hiking sense. The DELTA 3 Ultra Plus (77.2 lbs) and the Apex 300 + B300K (148.8 lbs) are both appliances you place and leave. The 71.6-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.
Q.How fast can each unit recharge from solar panels in real conditions?
On paper, the Apex 300 + B300K accepts 2,400W vs the DELTA 3 Ultra Plus's 1,600W 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 3.3 hours for the Apex 300 + B300K and 2.7 hours for the DELTA 3 Ultra Plus. That gap widens on cloudy days, when the Apex 300 + 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 Apex 300 + B300K's advantage is substantial.
Q.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: Check manufacturer warranty policy directly 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.
Q.Bottom line: should I buy the DELTA 3 Ultra Plus or the Apex 300 + B300K?
We'd pay the premium for the Apex 300 + 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 DELTA 3 Ultra Plus is still solid if budget is the priority, but the Apex 300 + B300K will leave you less likely to wish you'd "gone bigger" six months from now. That regret costs more than the price difference.
Still Deciding?
These expert guides cover the best picks for your use case — with calculators, comparison tables, and recommendations.
Emergency Prep Guide
Blackout-tested picks with runtime calculator
Read GuideBest for RV
Off-grid power stations with solar input & expansion
Read GuideBudget Picks Under $500
Best value per watt-hour for casual use
Read GuideSolar Generators
Ranked by solar charge speed — panels + station bundles
Read GuideFull Comparison Tool
Compare DELTA 3 Ultra Plus vs Apex 300 + B300K side-by-side with every spec
Open ToolReady to Decide?
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