3-4kWh home backup
Elite 400 vs F3800 Plus
Identical watt-hours, a $2,200 price gap. The difference is what the inverter can do and how far the system can grow.
Best for 240VAnker SOLIX F3800 Plus
3-4kWh home backup · Head-to-head
Bluetti Elite 400 vs EcoFlow DELTA 3 Ultra Plus: Capacity per Dollar or Inverter Headroom?
One is a watt-hour bargain; the other is a more capable home-backup platform. The right answer depends on whether your loads are large or long.
Our pick · Best capacity per dollar
Bluetti Elite 400
The Bluetti Elite 400 is the better value if you mainly need long runtime for a fridge, freezer, lights, and router. The EcoFlow DELTA 3 Ultra Plus is the better system if you need 3,600W output, plan to expand past 3kWh, or want 1,600W of solar input.
6.6WattBench
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Quick take
Which one fits your loads?
Choose Bluetti if
Elite 400
- You want the most usable watt-hours for the lowest price
- Your loads are mostly under 2,600W: fridge, freezer, lights, TV, CPAP
- You want wheels and a handle rather than a permanently installed system
Choose EcoFlow if
DELTA 3 Ultra Plus
- You need to start a well pump or run a 3,000W+ appliance
- You want to expand to 11.3kWh with EcoFlow batteries
- You have a large solar array and want 1,600W of input
Specifications
The numbers side by side
Green marks the stronger figure in that row. A stronger spec is not automatically the better product for your loads.
| Spec | Bluetti Elite 400 | EcoFlow DELTA 3 Ultra Plus |
|---|---|---|
| Rated capacity | 3,840 Wh | 3,072 Wh |
| Usable (85%) | 3,264 Wh | 2,611 Wh |
| Continuous output | 2,600 W | 3,600 W |
| Surge | 5,200 W | 7,200 W |
| Chemistry | LiFePO4 | LiFePO4 |
| Weight | 86 lb | 75 lb |
| AC input | 1,800 W | 1,800 W |
| Recharge time | 80% in 70 min (1,800W) | ~1.7 hr (1,800W) |
| Solar input | 1,000 W | 1,600 W |
| Expansion | No | 11.3 kWh |
| Warranty | 5 years | 5 years |
| Street price | $1,299–$1,499 | $1,599–$2,399 |
| Cost / usable Wh | $0.43 | $0.73 |
Manufacturer-published figures, checked November 2026. Usable energy uses our 85% rule. Green cells mark the stronger spec, not the better product for your loads.
WattBench score
How the two stations stack up
Weighted across six dimensions. The score is a starting point, not a verdict for your specific loads.
Bluetti Elite 400 · 6.6/10EcoFlow DELTA 3 Ultra Plus · 6.5/10
Capacity25%
Output20%
Portability15%
Recharge15%
Expandability10%
Value15%
Capacity 25%, output 20%, portability 15%, recharge 15%, expandability 10%, value 15%. Read the methodology.
The short version
The Elite 400 stores 3,840Wh and sells for roughly $1,399. The DELTA 3 Ultra Plus stores 3,072Wh and sells for roughly $1,899. Per usable watt-hour, the Bluetti is about 40% cheaper.
The EcoFlow answers with a 3,600W inverter, a 7,200W surge, 1,600W solar input, and an expansion path to 11.3kWh. It is the more capable machine; the question is whether you need that capability.
Capacity versus output
After the 85% usable-energy adjustment, the Elite 400 gives you about 3,264Wh; the Ultra Plus gives about 2,611Wh. That is 25% more runtime from the Bluetti.
The Ultra Plus gives you 1,000W more continuous output and a 2,000W higher surge rating. If your backup plan includes a 1HP well pump or a resistive load above 2,600W, the Bluetti is not enough. If your loads are a fridge, a furnace blower, and electronics, the extra capacity is more useful than the extra inverter.
Expansion changes the math
The Elite 400 has no expansion port. Its 3.84kWh is the ceiling. The Ultra Plus expands to 11.3kWh with EcoFlow batteries, which makes it a small whole-home platform rather than a single appliance.
If you expect to add capacity, price the batteries before you decide. A single expansion battery can close the price gap quickly, and the Ultra Plus's higher solar input becomes more valuable as the bank grows.
Solar and recharge
Both accept about 1,800W from AC. The Elite 400 recharges to 80% in about 70 minutes; the Ultra Plus takes roughly 1.7 hours to full. The Ultra Plus accepts 1,600W of solar versus 1,000W for the Elite 400.
For a cabin or van with a 1,200-1,600W array, the EcoFlow can absorb more of the peak. For a 400-800W array, both are limited by the panels, and the difference shrinks.
Weight and placement
The Elite 400 weighs 86 lb and has wheels; the Ultra Plus weighs 75 lb. Both are two-person lifts into a truck, but the EcoFlow is easier to carry short distances.
Neither is a grab-and-go unit. Plan a permanent spot near the appliances you want to back up, and use the wheels for small moves rather than stairs.
Which should you buy?
Buy the Elite 400 if you want maximum runtime per dollar and your appliances fit under 2,600W. It is the straightforward choice for fridge, freezer, and communications backup during a multi-day outage.
Buy the Ultra Plus if output or expansion is the constraint. The 3,600W inverter and 11.3kWh ceiling make it the more future-proof system, even though it stores less energy out of the box.
Runtime math
How long each station lasts
Same formula for both: rated capacity x 0.85, divided by the load. Real appliances cycle, so treat these as planning estimates.
| Load | Average draw | Elite 400 | DELTA 3 Ultra Plus |
|---|---|---|---|
| Refrigerator (avg.) | 75 W | 44 hr | 35 hr |
| CPAP (no humidifier) | 40 W | 3.4 days | 2.7 days |
| Wi-Fi + laptop | 60 W | 2.3 days | 44 hr |
| Microwave | 1,000 W | 3.3 hr | 2.6 hr |
| Space heater | 1,500 W | 2.2 hr | 1.7 hr |
Estimates use 85% of rated capacity and a constant average load. Real appliances cycle; a fridge's duty cycle and ambient temperature change the result. Run your own numbers.
FAQ
Questions buyers actually ask
Can the Elite 400 run a well pump?
It can run some 1/2HP pumps, but the 2,600W continuous rating is the limit. Check locked-rotor amps; a hard-starting deep-well pump may need a soft starter or a larger inverter.
Does the DELTA 3 Ultra Plus support 240V?
No. It is a 120V station. For 240V loads you need a unit with split-phase output, such as the DELTA Pro 3 or Anker SOLIX F3800 Plus.
Which is better for a refrigerator?
The Elite 400, because it has more usable watt-hours. At a 75W average draw it runs about 43.5 hours versus 34.8 hours for the Ultra Plus.
Is 2,600W enough for a 1.5HP pump?
Possibly not. A 1.5HP pump can draw well over 2,600W at startup. Use the pump's locked-rotor amp rating and a soft starter, or choose a station with a higher surge rating.
Which one is easier to move?
The Ultra Plus is 11 lb lighter at 75 lb. The Elite 400 has wheels, which helps on flat surfaces but not on stairs.
Before you buy
Check the current price and bundle.
Street prices move. The price band on this page is a research snapshot, not a live quote. Verify the current price, included accessories, and warranty terms at the merchant.