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If you’re shopping for heavy-duty backup power, you’re likely staring at three big names: the EF ECOFLOW DELTA Pro 3, the BLUETTI Apex 300, and the Anker SOLIX F3800. All three pack massive batteries (4096Wh, 2764.8Wh, and 3840Wh respectively) and can output 120V/240V, but they take very different approaches to getting the job done.
I’ve dug deep into the specs on these three power stations to help you decide which one fits your home, RV, or off-grid setup best. The key trade-off here is raw output power versus expandability versus portability, and I’ll break down exactly where each one shines so you don’t overpay for features you don’t need.
🏆 Quick Picks — My Top Recommendations
Best Overall: EF ECOFLOW DELTA Pro 3
Best balance of capacity (4096Wh), output (4000W, 6000W surge), and expandability up to 48kWh — plus whisper-quiet 30dB operation — Check Price →
Runner-Up: BLUETTI Apex 300
Most portable option at 66 pounds with a 3840W output and 7680W surge, plus 6000+ cycle battery lifespan — Check Price →
Best Raw Power: Anker SOLIX F3800
Highest continuous output at 6000W (10,200W surge) and expandable to 26.9kWh — best for running heavy appliances like central AC — Check Price →
Here’s how the EF ECOFLOW DELTA Pro 3, BLUETTI Apex 300, and Anker SOLIX F3800 stack up head-to-head on the specs that matter most for heavy-duty backup.
Full Specs Comparison
| Specification | EF ECOFLOW DELTA Pro 3 EF | BLUETTI Apex 300 Portable | Anker SOLIX F3800 Portabl |
|---|---|---|---|
| Battery Capacity | ✅ 4096Wh | 2764.8Wh | 3840Wh |
| Battery Type | LFP | LFP | ✅ LiFePO4 |
| AC Output Power | 4000W | 3840W | ✅ 6000W |
| AC Output Voltage | ✅ 120/240V | 120/240V | 120/240V |
| Surge Power | — | ✅ 7680W | — |
| Expandable Capacity | ✅ 48kWh | — | — |
| AC Outlets | — | ✅ 6 | — |
| Weight | — | — | — |
| Dimensions | — | — | — |
| Noise Level | — | — | — |
| Warranty | — | — | — |
| Solar Input | — | — | — |
The biggest gap I see is in continuous output power — the Anker SOLIX F3800 delivers 6000W compared to the EF ECOFLOW DELTA Pro 3’s 4000W, which makes a real difference if you’re trying to run a central AC or a big water pump.
Individual Product Breakdown
I tested these three power stations side by side on paper, looking at real output numbers, battery capacity, expandability, and portability to give you an honest take on each one.
EF ECOFLOW DELTA Pro 3 EFD521 Portable Power Station
4096Wh | 4000W output (6000W surge) | 120/240V | 115 lbs | Expandable to 48kWh
- Energize Almost Everything. The EcoFlow DELTA Pro 3 supports 120V/240V...
- Forget Refueling. Featuring a 4096Wh LFP battery capacity, expandable to...
- Plug and Play. Experience hassle-free power with the DELTA Pro 3, a...
The DELTA Pro 3 is the most well-rounded heavy-duty backup station I’ve seen. Its 4096Wh LFP battery gives you a solid starting point, and the ability to expand all the way to 48kWh means you can grow with it over time. I love the 30dB whisper-quiet operation — that’s quieter than a library — so you can run it indoors without losing sleep. The only real downside is the 115-pound weight, which makes it less portable than the BLUETTI, but for whole-home backup, that’s a fair trade-off.
✅ Pros
- Massive 4096Wh capacity expandable to 48kWh
- Ultra-quiet 30dB operation with X-Quiet technology
- 10ms switch-over for instant backup on sensitive electronics
- IP65-rated CTC battery pack for durability
❌ Cons
- Heavy at 115 pounds, not easy to move around
- Only 4000W continuous output — less than the Anker’s 6000W
BLUETTI Apex 300 Portable Power Station
2764.8Wh | 3840W output (7680W surge) | 120/240V | 66 lbs | Expandable to 58kWh
- [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 is the lightest of the three at just 66 pounds, and that makes a huge difference if you need to move it between rooms or take it camping. Its 2764.8Wh capacity is smaller than the competition, but the 7680W surge handles heavy startup loads like RV air conditioners without breaking a sweat. I’m impressed by the 6000+ cycle lifespan on the LFP battery — that’s 17 years of daily use. The downside is you’ll need extra batteries sooner if you’re powering a whole home for days.
✅ Pros
- Lightest at 66 pounds — easy to carry and store
- 7680W surge handles heavy startup loads like RV ACs
- 6000+ cycle battery lifespan for 17 years of use
- 6 AC outlets for multiple devices at once
❌ Cons
- Smallest base capacity at 2764.8Wh
- 3840W continuous output is lowest of the three
Anker SOLIX F3800 Portable Power Station
3840Wh | 6000W output (10,200W surge) | 120/240V | 132 lbs | Expandable to 26.9kWh
- Extended Backup Power: Add a Smart Generator 5500 for Auto Start-Stop...
- Enlarged Capacity From 3.84kWh: Anker SOLIX F3800 has 3.84kWh to power your...
- Dual-Voltage for Any Appliance: No more limitations when you're powering...
The Anker SOLIX F3800 is the brute of the bunch with a massive 6000W continuous output and a staggering 10,200W surge — that’s enough to start a 3-ton central AC or a big water pump. Its 3840Wh base capacity is solid, and you can stack up to six extra battery packs for 26.9kWh total. I also appreciate the direct NEMA 14-50 port for RV hookups and EV charging. The catch is the 132-pound weight — this thing is a beast to move, and it’s the most expensive option upfront.
✅ Pros
- Highest continuous output at 6000W with 10,200W surge
- Direct NEMA 14-50 port for RV and EV charging
- Expandable to 26.9kWh with up to 6 battery packs
- 5-year warranty with 10-year lifespan InfiniPower tech
❌ Cons
- Heaviest at 132 pounds — not portable at all
- Base capacity (3840Wh) is less than the DELTA Pro 3’s 4096Wh
Which One Should You Buy?
I’ve spent a lot of time with these specs, and the truth is there’s no universal winner — it all comes down to whether you need raw power, portability, or the best all-around package. Here’s who each station is actually built for.
EF ECOFLOW DELTA Pro 3 is right for you if…
- You want whole-home backup from day one with 4096Wh capacity that expands to 48kWh
- You need near-silent operation at 30dB for indoor use or overnight charging
- You value a 10ms switch-over for protecting sensitive electronics like NAS systems or servers
BLUETTI Apex 300 is right for you if…
- You need to move your power station between rooms, camping trips, or RVs — it’s only 66 pounds
- You want a battery that lasts 6000+ cycles, giving you 17 years of reliable use
- You’re on a tighter budget but still need 120V/240V output and a strong 7680W surge for startup loads
Anker SOLIX F3800 is right for you if…
- You need to run heavy appliances like a 3-ton central AC or a 1 HP water pump — it delivers 6000W continuous
- You own an RV or EV and want direct NEMA 14-50 hookup without extra adapters
- You plan to expand big — up to 26.9kWh with six extra battery packs for multi-day off-grid living
❌ Who Should Skip All of These?
If you only need to keep a few lights and a fridge running for a few hours, all three of these are overkill. You’d be better off with a smaller, lighter station around 1000-2000Wh that costs less and is easier to stash in a closet.
For my money, the EF ECOFLOW DELTA Pro 3 is the smartest pick for most homeowners — it gives you the biggest base capacity at 4096Wh, the quietest operation, and room to grow to 48kWh without breaking the bank on day one.
Frequently Asked Questions
Which station has the most power for running a central AC — the DELTA Pro 3 or the SOLIX F3800?
The Anker SOLIX F3800 wins hands-down here with 6000W continuous output and a 10,200W surge, which is enough to start a 3-ton central AC. The EF ECOFLOW DELTA Pro 3 puts out 4000W continuous (6000W with X-Boost), so it can handle a smaller central unit but it’ll struggle with bigger compressors. If your main goal is running a large AC during a heatwave, go with the Anker.
Is the BLUETTI Apex 300 worth buying over the DELTA Pro 3 if I’m on a budget?
Yes, absolutely — the BLUETTI Apex 300 costs less upfront while still delivering 120V/240V output and a strong 7680W surge. The trade-off is you get 2764.8Wh of base capacity versus the DELTA Pro 3’s 4096Wh, so you’ll need to add extra batteries sooner if you’re powering a whole home. For weekend camping or short outages, the Apex 300 is a fantastic value.
Which power station is easiest to move around — the Apex 300 or the SOLIX F3800?
The BLUETTI Apex 300 at 66 pounds is by far the easiest to carry, and it’s the only one I’d actually call portable. The Anker SOLIX F3800 weighs 132 pounds and the EF ECOFLOW DELTA Pro 3 comes in at 115 pounds — both are really “move with a dolly” territory. If you plan to take your station camping or between rooms, the Apex 300 is your only real option here.
Can I charge my EV directly from any of these power stations?
Only the Anker SOLIX F3800 has a built-in NEMA 14-50 port that lets you plug in an EV charger directly at 6000W. The EF ECOFLOW DELTA Pro 3 and BLUETTI Apex 300 both support 120V/240V output, but you’ll need an adapter and you won’t get the same charging speed. For emergency EV top-ups, the Anker is the clear winner.
How many days of backup power do each of these provide for a typical home?
It depends on your load, but here’s a rough idea based on base capacity: the EF ECOFLOW DELTA Pro 3 with 4096Wh can run a fridge, lights, and phones for about 2-3 days. The Anker SOLIX F3800 at 3840Wh is close at 2 days, and the BLUETTI Apex 300 at 2764.8Wh gives you roughly 1-2 days. All three can be expanded with extra batteries for much longer runtime.
Which station has the longest battery lifespan — the DELTA Pro 3 or the Apex 300?
The BLUETTI Apex 300 takes this one with 6000+ cycles at 80% capacity, which works out to about 17 years of daily use. The EF ECOFLOW DELTA Pro 3 uses automotive-grade LFP cells with a 5-year warranty, but doesn’t specify a cycle count as high as BLUETTI’s. If you plan to cycle your station daily for years, the Apex 300 is built to last longer.
My Final Verdict
The EF ECOFLOW DELTA Pro 3 is my clear winner for most people — it packs the largest base capacity at 4096Wh, expands to a massive 48kWh, and runs whisper-quiet at 30dB, making it the most versatile heavy-duty backup station here. The Anker SOLIX F3800 takes the runner-up spot for anyone who absolutely needs 6000W continuous output to run big appliances, while the BLUETTI Apex 300 is the best pick if portability and a 6000+ cycle lifespan matter more than raw capacity.
If you’re still on the fence, ask yourself one question: do you need to move this station around, or is it staying in one spot? If it’s staying put, the DELTA Pro 3 gives you the most capacity and quietest operation for the money. If you’re hauling it to the RV or campsite, the lighter Apex 300 wins every time.
Winner: EF ECOFLOW DELTA Pro 3
- Energize Almost Everything. The EcoFlow DELTA Pro 3 supports 120V/240V...
- Forget Refueling. Featuring a 4096Wh LFP battery capacity, expandable to...
- Plug and Play. Experience hassle-free power with the DELTA Pro 3, a...
Best for homeowners who want the biggest base capacity (4096Wh), quietest operation at 30dB, and the option to expand all the way to 48kWh for whole-home backup without breaking a sweat.
Runner-Up: Anker SOLIX F3800
- Extended Backup Power: Add a Smart Generator 5500 for Auto Start-Stop...
- Enlarged Capacity From 3.84kWh: Anker SOLIX F3800 has 3.84kWh to power your...
- Dual-Voltage for Any Appliance: No more limitations when you're powering...
Best for anyone who needs to run heavy appliances like a 3-ton central AC — its 6000W continuous output and 10,200W surge blow the others away, plus the NEMA 14-50 port makes RV and EV hookup a breeze.
Best Portable Option: 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 campers and RVers who need to move their power station — at 66 pounds it’s half the weight of the others, and the 6000+ cycle battery means it’ll still be working strong 17 years from now.
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