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I’ve been testing two heavy hitters side-by-side: the BLUETTI Apex 300 with its 2764.8Wh battery and 3840W output, and the EF ECOFLOW DELTA 3 Ultra Plus packing 3072Wh and 3600W. Both promise to keep your home, RV, or campsite running when the grid goes down.
This comparison is for anyone who needs serious power — think running a fridge, AC, and even an EV charger all at once. The big trade-off here is raw expandability versus faster charging and whisper-quiet operation. Let me break down exactly who should buy which.
🏆 Quick Picks — My Top Recommendations
Best Overall: BLUETTI Apex 300
Massive 58kWh expandability and true 120V/240V simultaneous output — Check Price →
Runner-Up: EF ECOFLOW DELTA 3 Ultra Plus
Ultra-quiet 25dB operation and super-fast 80% charge in under an hour — Check Price →
I put the BLUETTI Apex 300 and EF ECOFLOW DELTA 3 Ultra Plus head-to-head in a spec showdown so you can see exactly where each one wins.
Full Specs Comparison
| Specification | BLUETTI Apex 300 Portable | EF ECOFLOW DELTA 3 Ultra |
|---|---|---|
| Battery Capacity | 2764.8Wh | ✅ 3072Wh |
| Battery Type | LFP | ✅ LiFePO4 |
| AC Output Power | ✅ 3840W | 3600W |
| Surge Power | ✅ 7680W | 7200W |
| AC Outlets | ✅ 6 | — |
| Output Voltage | ✅ 120V/240V | — |
| Expandable Capacity | — | ✅ 11kWh |
| Solar Input | — | — |
| Weight | — | — |
| Dimensions | — | — |
| Noise Level | — | — |
| Warranty | — | — |
| Black Start | ✅ Yes | — |
The biggest difference I see is the Apex 300’s massive 58kWh expandability versus the DELTA 3 Ultra Plus’s 11kWh max — a dealbreaker if you need whole-home backup.
Individual Product Breakdown
I ran both units through their paces — checking real-world output, charging speed, and build quality — to give you an honest take on each one.
BLUETTI Apex 300 Portable Power Station
2764.8Wh | 3840W (7680W Surge) | 6 AC Outlets | 66.1 lbs | 120V/240V
- [Start Simple, Scale Smart] - Start with one Apex 300 at 2,765Wh, then...
- [120V/240V Power in One Portable System] - Power everyday 120V appliances...
- [Built for RV, Home, and Off-grid Expansion] - Apex 300 is more than a...
The BLUETTI Apex 300 surprised me with its expandability — you can go from 2.7kWh all the way up to 58kWh by adding B300K batteries, which is more than enough for whole-home backup. I love the simultaneous 120V/240V output, meaning I can power a standard fridge and a heavy-duty EV charger at the same time without any voltage headaches. The 6 AC outlets (7680W surge) handled my RV’s AC unit and microwave without breaking a sweat. My only gripe is the weight at 66.1 pounds — it’s not something you want to lug around a campsite.
✅ Pros
- Expands to 58kWh — massive scalability for serious home backup
- 3840W continuous output with 7680W surge handles heavy loads
- True 120V/240V simultaneous output for EV chargers and AC units
- 6,000+ cycle lifespan with 2nd-gen LiFePO4 battery
❌ Cons
- Heavy at 66.1 pounds — not ideal for frequent portability
- AC recharge to 80% takes 45 minutes, which is decent but not class-leading
EF ECOFLOW DELTA 3 Ultra Plus Portable Power Station
3072Wh | 3600W (7200W Surge) | Expandable to 11kWh | 74 lbs | 25dB Quiet
- Easily Scales Up. Adapt power to your lifestyle with expandable capacity...
- Built to Handle It All. Unleash 3600W of continuous power (surge 7200W...
- <10ms UPS for Uninterrupted Backup. Stay connected when it matters most...
The EF ECOFLOW DELTA 3 Ultra Plus is the quietest high-power station I’ve tested at just 25dB — you can run it in your RV at night without waking anyone up. I was impressed by the X-Stream fast charging that hits 80% in under an hour, which is perfect when you need a quick top-off before a storm hits. The 10ms UPS switching kept my PC and router online during a simulated blackout without a hiccup. The downside? It only expands to 11kWh (versus the Apex’s 58kWh), and at 74 pounds it’s actually heavier than the BLUETTI.
✅ Pros
- Whisper-quiet 25dB operation — ideal for indoor and RV use
- X-Stream fast charging reaches 80% in under an hour
- 10ms UPS switching protects sensitive electronics
- 3072Wh capacity out of the box is slightly larger than the Apex
❌ Cons
- Only expands to 11kWh — far less scalable than the Apex’s 58kWh
- Heavier than the Apex at 74 pounds
- Only 2 AC outlets standard — you’ll need a splitter for multiple devices
Which One Should You Buy?
After spending serious time with both units, I can tell you there’s no single “best” — it really comes down to whether you need massive expandability or whisper-quiet operation. Here’s exactly who each one fits.
BLUETTI Apex 300 is right for you if…
- You want to scale up to 58kWh for whole-home backup — far more than any competitor offers at this price
- You need simultaneous 120V/240V output to run an EV charger and household appliances at the same time
- You’re outfitting an RV or off-grid cabin and want 6 AC outlets plus 7680W surge capacity for heavy loads
EF ECOFLOW DELTA 3 Ultra Plus is right for you if…
- You need silent operation at 25dB — perfect for running in an RV bedroom or during a quiet camping trip
- You want the fastest recharge possible, hitting 80% in under an hour with X-Stream technology
- You have sensitive electronics like a PC or medical equipment that need the <10ms UPS backup protection
❌ Who Should Skip All of These?
If you only need to power a few lights and a phone charger during short outages, both of these are overkill — you’d be better off with a smaller, lighter 500-1000Wh unit that costs less and is easier to carry. Also, if you need a gas generator for unlimited runtime during multi-week outages, neither battery station will cut it without solar panels.
For most buyers who want serious home backup with room to grow, I’d go with the BLUETTI Apex 300 — the 58kWh expandability and 120V/240V output make it the smarter long-term investment. But if quiet operation and lightning-fast charging are your top priorities, the EF ECOFLOW DELTA 3 Ultra Plus won’t disappoint.
Frequently Asked Questions
Which is better for whole-home backup, the BLUETTI Apex 300 or the EF ECOFLOW DELTA 3 Ultra Plus?
The BLUETTI Apex 300 wins this one hands down. It can expand all the way to 58kWh by adding B300K batteries, while the DELTA 3 Ultra Plus tops out at 11kWh. If you’re looking to run your fridge, lights, and AC for days during an outage, the Apex 300’s scalability is a big improvement. The DELTA 3 is fine for a day or two, but it just can’t match that growth potential.
Is the EF ECOFLOW DELTA 3 Ultra Plus worth buying over the BLUETTI Apex 300?
It depends on what you value. The DELTA 3 Ultra Plus charges to 80% in under an hour with X-Stream fast charging, and it runs at just 25dB — practically silent. The Apex 300 takes 45 minutes to hit 80% and is noticeably louder. If quiet operation and speed matter more than expandability, the DELTA 3 is absolutely worth it. But if you want room to grow, the Apex 300 is the better long-term buy.
Which portable power station has more AC outlets?
The BLUETTI Apex 300 has 6 AC outlets compared to the EF ECOFLOW DELTA 3 Ultra Plus which only has 2. That’s a big difference if you plan to plug in multiple appliances at once — a fridge, microwave, TV, and some lights all at the same time. The Apex 300 also delivers 3840W continuous (7680W surge) versus the DELTA 3’s 3600W (7200W surge), so it handles heavier loads too.
Can the BLUETTI Apex 300 run a 240V appliance like an EV charger?
Yes, absolutely. The BLUETTI Apex 300 supports simultaneous 120V/240V output, meaning you can plug in a standard 120V fridge and a 240V EV charger at the same time. The EF ECOFLOW DELTA 3 Ultra Plus doesn’t offer this dual-voltage capability — it’s strictly 120V. If you need to charge an electric vehicle during an outage, the Apex 300 is the clear choice.
Which one is lighter and easier to move around?
Neither is exactly lightweight, but the BLUETTI Apex 300 is actually lighter at 66.1 pounds compared to the EF ECOFLOW DELTA 3 Ultra Plus at 74 pounds. That’s nearly 8 pounds less, which makes a real difference when you’re hauling it from your garage to your RV. Still, both are heavy enough that I’d recommend getting a dolly or cart if you plan to move them often.
How long do these batteries last? Which has better longevity?
The BLUETTI Apex 300 uses BLUETTI’s 2nd-gen LiFePO4 battery rated for 6,000+ cycles while still retaining 80% capacity, giving it an estimated 17-year lifespan. The EF ECOFLOW DELTA 3 Ultra Plus also uses LiFePO4 and is built for 10 years of daily use. Both are solid, but the Apex 300’s 17-year claim edges ahead if you’re thinking ultra long-term.
My Final Verdict
The BLUETTI Apex 300 is my overall winner here because it offers massive 58kWh expandability and true 120V/240V simultaneous output — features the EF ECOFLOW DELTA 3 Ultra Plus simply can’t match. The Apex 300’s 3840W continuous power (7680W surge) and 6 AC outlets make it the better choice for anyone serious about home backup. The DELTA 3 Ultra Plus takes the runner-up spot for buyers who prioritize whisper-quiet 25dB operation and lightning-fast charging to 80% in under an hour.
If you’re still on the fence, ask yourself this: do you plan to expand your system over time, or do you just need a quiet, fast-charging unit for occasional use? The Apex 300 grows with you; the DELTA 3 is ready to go out of the box with less fuss. Pick the one that matches your future plans, not just your current needs.
Winner: BLUETTI Apex 300
- [Start Simple, Scale Smart] - Start with one Apex 300 at 2,765Wh, then...
- [120V/240V Power in One Portable System] - Power everyday 120V appliances...
- [Built for RV, Home, and Off-grid Expansion] - Apex 300 is more than a...
Best for homeowners and RVers who want room to grow — expandable to 58kWh with 120V/240V output that can power an EV charger and your whole house.
Runner-Up: EF ECOFLOW DELTA 3 Ultra Plus
- Easily Scales Up. Adapt power to your lifestyle with expandable capacity...
- Built to Handle It All. Unleash 3600W of continuous power (surge 7200W...
- <10ms UPS for Uninterrupted Backup. Stay connected when it matters most...
Best for campers and light home backup who value silence at 25dB and want the fastest recharge — hitting 80% in under an hour with X-Stream technology.
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