EcoFlow DELTA 3 Ultra Runtime Calculator
3,072 Wh LiFePO4 · 3,600 W AC (7,200 W surge) · runs a 34 W CPAP with humidifier about 2–2.4 days
Specs verified 8 Oct 2026 from ecoflow.com
KiloHour is independent and not affiliated with or endorsed by EcoFlow. EcoFlow and product names are trademarks of their respective owners. Images: EcoFlow.
At a glance
What the DELTA 3 Ultra runs
From its 3,600 W AC outlets, 5 of 6 listed devices last their usual hours, the space heater does not.
- Runs it
Fridge 123 W
42–50 h
123 W running and a 800 W startup peak fit within the DELTA 3 Ultra's 3,600 W continuous and 7,200 W surge ratings. Runtime at its 41 W average, as the compressor cycles.
- Runs it
Microwave (1,000 W cooking power) 1500 W
1 h
1,500 W running and a 1,500 W startup peak fit within the DELTA 3 Ultra's 3,600 W continuous and 7,200 W surge ratings.
- Tight fit
Space heater 1500 W
1 h
It runs about 1 h 36 min, short of the 4 h you need.
- Runs it
TV 120 W
17–19 h
120 W running and a 120 W startup peak fit within the DELTA 3 Ultra's 3,600 W continuous and 7,200 W surge ratings.
- Runs it
CPAP with humidifier 34 W
2–2.4 days
34 W running and a 34 W startup peak fit within the DELTA 3 Ultra's 3,600 W continuous and 7,200 W surge ratings.
- Runs it
Wi-Fi router 10 W
4.2–5.4 days
10 W running and a 10 W startup peak fit within the DELTA 3 Ultra's 3,600 W continuous and 7,200 W surge ratings.
Spec sheet
DELTA 3 Ultra verified specs
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Our take
What the DELTA 3 Ultra is good at, and what to watch for
KiloHour take Pick it if you need 3kWh and a 30A RV outlet in one unit for home backup or camping, but solar input stops at 800W, and EcoFlow's table lists no expansion for this model.
The DELTA 3 Ultra holds 3,072Wh of LiFePO4 and delivers 3,600W continuous, with a 7,200W surge rating and X-Boost up to 4,600W for resistive loads. Along with four 20A outlets, it has a 30A TT-30 outlet for an RV.
Its most useful feature for home backup is what EcoFlow calls X-Fusion. When the unit is plugged into the grid or a generator in bypass mode, the inverter supplies the outlets, so they can still deliver the full 3,600W rather than being capped by the 1,800W grid input. It connects to a home through a manual transfer switch or an inlet box.
Charging is moderate for the capacity. AC charging runs at 1,800W, reaching 80 percent in 89 minutes, and solar input tops out at 800W, reaching 80 percent in 3.37 hours under EcoFlow's lab conditions.
EcoFlow's own comparison table sets it against the DELTA 3 Ultra Plus, a separate model that adds a 1,600W solar input, a 378W Anderson 12V port and support for two extra batteries, for 11kWh in total. That same table lists this model's expansion as 0.
Other listed specs include a UPS switchover under 10 ms, 140W USB-C, a 126W car outlet, noise of 25 dB or less at 600W and Class B EMC certification. It weighs 32.7 kg, so it is a unit to park rather than carry around.
Sources: ecoflow.com, ecoflow.com
Same brand
Other EcoFlow models
| Model | Capacity | AC output | Solar input | Weight |
|---|---|---|---|---|
| DELTA 2 MaxSmaller | 2,048 Wh (−1,024 Wh) | 2,400 W | 1,000 W | 50 lb |
| DELTA ProLarger | 3,600 Wh (+528 Wh) | 3,600 W | 1,600 W | 99 lb |
| DELTA 3 MaxSmaller | 2,048 Wh (−1,024 Wh) | 2,400 W | 500 W | Not published |
Alternatives
Other brands near 3,072 Wh
| Model | Capacity | AC output | Solar input | Weight |
|---|---|---|---|---|
| Anker SOLIX F3000Same capacity | 3,072 Wh | 3,600 W | 2,400 W | 91.5 lb |
| Anker SOLIX F2600-17% capacity | 2,560 Wh (−512 Wh) | 2,400 W | 1,000 W | 69.7 lb |
FAQ
DELTA 3 Ultra questions
Answers use the same published specs and labelled assumptions as the calculator.
How long will the DELTA 3 Ultra last?
3,072 Wh stored, about 2,765 Wh of it usable at the typical estimate. At its full 3,600 W rating it empties in about 38–41 min.
What is X-Boost on the DELTA 3 Ultra?
X-Boost lifts the limit to 4,600 W, for resistive loads (kettles, heaters) only. Motors and electronics stay capped at 3,600 W. Motor starts can briefly pull up to 7,200 W.
What is the DELTA 3 Ultra solar input?
Up to 800 W of panels. A single 200 W panel needs about 4.1 sunny days; panels at the full 800 W need about 5.2 peak-sun hours. Panels are assumed to deliver 75% of their rating.
Can the DELTA 3 Ultra run a CPAP overnight?
Yes: 7 nights of 8 hours from a CPAP drawing 34 W with its heated humidifier and tube on (ResMed's measured figure).
Does the DELTA 3 Ultra work as a UPS?
EcoFlow lists a 10 ms switchover when wall power drops.