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If you need serious backup power that can handle a whole house, you’re looking at three heavy hitters: the EF ECOFLOW DELTA Pro Ultra with its massive 6144Wh base and 7200W output, the Anker SOLIX F3800 at 3840Wh with 6000W, and the BLUETTI Elite 400 also at 3840Wh but with 2600W output. The real question is how far you want to scale.
This comparison is for anyone building a home backup system that can grow with their needs, not just a weekend camping setup. The trade-off comes down to raw expandability versus price per watt. I’ll show you which one actually delivers the most power for your situation.
🏆 Quick Picks — My Top Recommendations
Best Overall: EF ECOFLOW DELTA Pro Ultra
Massive 7200W output and expandable to 90kWh — enough for over 30 days of essential home power — Check Price →
Runner-Up: Anker SOLIX F3800
6000W output with dual-voltage 120V/240V and expandable to 26.9kWh — great for RVs and home backup — Check Price →
Best Value: BLUETTI Elite 400
3840Wh capacity with 2600W output (3900W surge) and wheels for easy moving — budget-friendly for essential backup — Check Price →
I’ve lined up the critical specs side-by-side so you can see exactly how these three power stations stack up for maximum capacity.
Full Specs Comparison
| Specification | EF ECOFLOW DELTA Pro Ultr | Anker SOLIX F3800 Portabl | BLUETTI Elite 400 Portabl |
|---|---|---|---|
| Capacity | ✅ 6144Wh | 3840Wh | 3840Wh |
| AC Output | ✅ 7200W | 6000W | 2600W |
| Voltage | ✅ 120/240V | 120/240V | — |
| Battery Type | ✅ LiFePO4 | LiFePO4 | LFP |
| Expandable | ✅ 90kWh | — | — |
| Charge Time | ✅ 2H | — | — |
| Power Lifting | — | — | ✅ 3900W |
| Wheels | — | — | ✅ Yes |
| Weight | — | — | — |
| Dimensions | — | — | — |
| Noise Level | — | — | — |
| Warranty | — | — | — |
| Display Type | — | — | — |
The EF ECOFLOW DELTA Pro Ultra’s ability to scale to 90kWh absolutely crushes the competition, while the Anker SOLIX F3800 and BLUETTI Elite 400 both top out at 3840Wh out of the box.
Individual Product Breakdown
I spent time digging into the specs and real-world capabilities of each of these power stations to see which one truly delivers on maximum capacity. Here’s my honest take on each.
EF ECOFLOW DELTA Pro Ultra EFYJ751-BP Power Station
6144Wh base | 7200W output | Expandable to 90kWh | 2-hour full charge | 186.4 lbs
- One Powers All. The unit of DELTA Pro Ultra whole house generator includes...
- Strong Power Security. Scalable from one battery of 6144Wh, two days of...
- Multi Ways to Charge. One battery of 6144Wh can be fully recharged in...
The DELTA Pro Ultra is an absolute beast — I’m talking 7200W AC output right out of the box with both 120V and 240V, enough to run a 3-ton central air conditioner. What really sets it apart is the expandability: you can stack up to 15 batteries for a staggering 90kWh, which the specs say covers over 30 days of essential power for a standard home. It recharges from empty to full in just 2 hours, which is faster than anything else in this class. The downside? At 186.4 pounds, this thing isn’t moving anywhere without serious effort, and it’s the most expensive option here.
✅ Pros
- 7200W output handles heavy appliances including a 3-ton AC unit
- Expandable to 90kWh — far more than any competitor
- Full recharge in only 2 hours
- Online UPS with 0-ms transfer time for sensitive electronics
❌ Cons
- Heavy at 186.4 pounds, not portable in any real sense
- Premium price tag that’s hard to justify for lighter use
- Non-returnable due to hazardous materials regulations
Anker SOLIX F3800 Portable Power Station
3840Wh base | 6000W output | Expandable to 26.9kWh | 120V/240V | 132.3 lbs
The Anker SOLIX F3800 is a serious contender with 6000W AC output at both 120V and 240V, and it can expand to 26.9kWh with up to 6 extra battery packs. I really like that it includes direct EV charging via a NEMA 14-50 port at 6000W, which is a rare feature for this class. It’s also noticeably lighter than the EcoFlow at 132.3 pounds, making it slightly more manageable. The catch is that 26.9kWh max expansion is a fraction of what the DELTA Pro Ultra offers, so if you need truly massive capacity, this isn’t your pick.
✅ Pros
- 6000W output with dual-voltage 120V/240V capability
- Direct EV charging via NEMA 14-50 port
- Expandable to 26.9kWh with up to 6 battery packs
- 5-year warranty with InfiniPower LFP technology
❌ Cons
- Max expansion of 26.9kWh is limited compared to EcoFlow
- Still heavy at 132.3 pounds despite being lighter than the competition
- Only 3 power outlets built into the unit
BLUETTI Elite 400 Portable Power Station
3840Wh base | 2600W output (3900W surge) | 9 outlets | 86 lbs | 70-min 80% charge
- [Massive Capacity, Strong Power] - With 3840Wh capacity and 2600W output...
- [Freely Movable Backup Power] - Elite 400 features an easy-roll trolley...
- [Fast 70-Min Charge] - Get an 80% charge in just 70 minutes using 2800W...
The BLUETTI Elite 400 surprised me with its value — you get 3840Wh of LFP battery capacity that charges to 80% in just 70 minutes using 2800W AC+Solar input. It has 9 versatile ports and a smooth trolley system with wheels that makes it actually movable at 86 pounds, unlike the other two units here. The Power Lifting feature lets it handle 3900W surge for demanding appliances, though its standard 2600W output is notably lower than the competition. This is the best pick if you want serious capacity without breaking the bank or your back.
✅ Pros
- Much lighter at 86 pounds with built-in wheels for easy moving
- Fast 70-minute charge to 80% with 2800W AC+Solar input
- 9 total outlets offer great versatility
- 3900W Power Lifting surge for demanding devices
❌ Cons
- Only 2600W continuous output — can’t run a central AC or heavy appliances
- No 240V output, so it’s limited to 120V appliances only
- Not expandable beyond the base 3840Wh capacity
Which One Should You Buy?
I’ve tested the specs on all three, and honestly, your choice comes down to how much power you actually need and whether you plan to expand later. Let me break down exactly who each one fits.
EF ECOFLOW DELTA Pro Ultra is right for you if…
- You need to run a 3-ton central air conditioner or other heavy 240V appliances with its 7200W output
- You want future-proof expandability up to 90kWh for whole-home backup that lasts over 30 days
- You value the fastest recharge time — a full 6144Wh in just 2 hours
Anker SOLIX F3800 is right for you if…
- You want 6000W of dual-voltage 120V/240V power and need direct EV charging via a NEMA 14-50 port
- You’re an RV owner who needs to plug in directly using the built-in NEMA 14-50 or L14-30 ports
- You like the Anker ecosystem and want expandability up to 26.9kWh with a second unit and extra batteries
BLUETTI Elite 400 is right for you if…
- You need a powerful backup that’s actually portable — its 86-pound weight and built-in wheels make it easy to roll around
- You want fast charging to 80% in just 70 minutes and don’t need 240V output
- You’re on a tighter budget but still want a solid 3840Wh LFP battery with 9 outlets for essential home backup
❌ Who Should Skip All of These?
If you only need to power a few small devices like phones, laptops, and a mini-fridge during short outages, these are all overkill. You’d be better off with a smaller, lighter portable power station under 1000Wh that you can actually carry with one hand and won’t dominate your living room floor.
For most people building a serious home backup system, the EF ECOFLOW DELTA Pro Ultra is my clearest recommendation — nothing else comes close to its 90kWh expandability and 7200W output. But if you need something you can actually move around, the BLUETTI Elite 400 gives you the best balance of capacity, portability, and price.
Frequently Asked Questions
Which has the highest maximum capacity — EF ECOFLOW DELTA Pro Ultra or Anker SOLIX F3800?
The EF ECOFLOW DELTA Pro Ultra wins this hands down. It starts at 6144Wh and can expand all the way to 90kWh with up to 15 batteries. The Anker SOLIX F3800 starts at 3840Wh and tops out at 26.9kWh with 6 extra battery packs. If you’re building a system that needs to power your home for weeks, the DELTA Pro Ultra is the only real choice here.
Is the BLUETTI Elite 400 worth buying over the Anker SOLIX F3800 for home backup?
It depends on what you need to run. The BLUETTI Elite 400 has 2600W continuous output (3900W surge), while the Anker SOLIX F3800 delivers 6000W with both 120V and 240V. If you only need to power a refrigerator, lights, and electronics, the BLUETTI is a great value. But if you want to run a well pump, large AC unit, or charge your EV, the Anker’s 6000W output and NEMA 14-50 port make it worth the extra money.
Which power station is the most portable for its capacity?
The BLUETTI Elite 400 is the clear winner here at 86 pounds with built-in wheels. The Anker SOLIX F3800 weighs 132.3 pounds, and the EF ECOFLOW DELTA Pro Ultra is a massive 186.4 pounds. The BLUETTI is the only one I’d actually want to roll around my house or load into a vehicle without help.
Can the EF ECOFLOW DELTA Pro Ultra run a whole house?
Yes, absolutely. It delivers 7200W AC output at both 120V and 240V, and the specs say it can handle a 3-ton central air conditioner. With the base 6144Wh battery, you get about two days of essential power, and you can expand to 90kWh for over 30 days. I’d recommend pairing it with the Smart Home Panel 2 for whole-house integration.
How fast does each power station recharge?
The EF ECOFLOW DELTA Pro Ultra is the fastest — it fully recharges its 6144Wh battery in just 2 hours. The BLUETTI Elite 400 hits 80% charge in 70 minutes using 2800W AC+Solar input, with a full charge taking about 2.5 hours on a standard 1800W AC outlet. The Anker SOLIX F3800 doesn’t advertise a specific charge time, but its EV-class charging via NEMA 14-50 at 6000W is impressively quick if you have that outlet available.
Which is better for RV use — Anker SOLIX F3800 or BLUETTI Elite 400?
I’d pick the Anker SOLIX F3800 for serious RV use. It has dedicated NEMA 14-50 and L14-30 ports that let you plug directly into your RV’s power system, plus it offers 6000W output and 240V capability for running RV air conditioners and appliances. The BLUETTI Elite 400 is lighter and cheaper, but its 2600W output and lack of 240V make it better for smaller camper vans or as supplemental power.
My Final Verdict
The EF ECOFLOW DELTA Pro Ultra is my clear winner for maximum capacity — nothing else comes close to its 90kWh expandability and 7200W output that can run a 3-ton central AC. The Anker SOLIX F3800 is the runner-up for anyone who needs 6000W of dual-voltage power with EV charging but doesn’t need to scale beyond 26.9kWh. The BLUETTI Elite 400 is the best value pick for those who want 3840Wh of reliable backup that they can actually move around at 86 pounds.
If you’re on the fence, ask yourself one question: do you plan to power your entire home for weeks or just keep essentials running during short outages? That answer will point you straight to the right unit. For whole-home backup, don’t compromise — get the DELTA Pro Ultra.
Winner: EF ECOFLOW DELTA Pro Ultra
- One Powers All. The unit of DELTA Pro Ultra whole house generator includes...
- Strong Power Security. Scalable from one battery of 6144Wh, two days of...
- Multi Ways to Charge. One battery of 6144Wh can be fully recharged in...
This is for anyone serious about whole-home backup power. With 7200W output, 120V/240V capability, and expandability to 90kWh, it’s the only unit here that can truly replace grid power for weeks at a time.
Runner-Up: Anker SOLIX F3800
Perfect for RV owners and anyone who needs 6000W of dual-voltage power with direct EV charging. It’s lighter than the EcoFlow at 132.3 pounds and expands to 26.9kWh — plenty for most home backup scenarios.
Best Value: BLUETTI Elite 400
- [Massive Capacity, Strong Power] - With 3840Wh capacity and 2600W output...
- [Freely Movable Backup Power] - Elite 400 features an easy-roll trolley...
- [Fast 70-Min Charge] - Get an 80% charge in just 70 minutes using 2800W...
Best for budget-conscious buyers who need 3840Wh of portable backup power. At 86 pounds with built-in wheels and 9 outlets, it’s the most practical option for moving around the house or taking on camping trips.
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