EcoFlow DELTA 3 Max Runtime Calculator
2,048 Wh LiFePO4 · 2,400 W AC (4,800 W surge) · runs a 34 W CPAP with humidifier about 32–38 h
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 Max runs
From its 2,400 W AC outlets, 5 of 6 listed devices last their usual hours, the space heater does not.
- Runs it
Fridge 123 W
28–33 h
123 W running and a 800 W startup peak fit within the DELTA 3 Max's 2,400 W continuous and 4,800 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 Max's 2,400 W continuous and 4,800 W surge ratings.
- Tight fit
Space heater 1500 W
1 h
It runs about 1 h 4 min, short of the 4 h you need.
- Runs it
TV 120 W
11–12 h
120 W running and a 120 W startup peak fit within the DELTA 3 Max's 2,400 W continuous and 4,800 W surge ratings.
- Runs it
CPAP with humidifier 34 W
32–38 h
34 W running and a 34 W startup peak fit within the DELTA 3 Max's 2,400 W continuous and 4,800 W surge ratings.
- Runs it
Wi-Fi router 10 W
2.8–3.6 days
10 W running and a 10 W startup peak fit within the DELTA 3 Max's 2,400 W continuous and 4,800 W surge ratings.
Spec sheet
DELTA 3 Max verified specs
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Our take
What the DELTA 3 Max is good at, and what to watch for
KiloHour take Pick it if you want 2kWh and 2,400W for appliances like a refrigerator or washer at a lighter weight, but solar input is limited to 500W, and the page lists no extra battery support.
The DELTA 3 Max puts 2,048Wh of LiFePO4 behind 2,400W continuous AC output and a 4,800W surge rating. X-Boost runs resistive loads up to 3,400W at reduced voltage, and EcoFlow names refrigerators, coffee makers, washers and circular saws as typical loads. At 20.3 kg, it is the lighter of the two 2kWh DELTA 3 models.
The DELTA 3 Max Plus shares its capacity but adds 3,000W output, 1,000W of solar, 140W USB-C and support for extra batteries, at 22.1 kg. The older DELTA 2 Max also takes extra batteries.
On the Max itself, solar input is 500W, which EcoFlow says takes 3.43 hours to reach 80 percent. Wall or generator charging runs at 1,800W, with 0 to 80 percent in 68 minutes, and a 500W Alternator Charger adds charging while driving.
Two limits stand out. The page lists no extra battery support, and a compatibility note says the unit has only an XT60 port, so reverse charging and battery preservation modes, which need XT150 or 4+8 pin cables, are not available. That makes the 2,048Wh a fixed budget for outages.
The rest of the spec sheet is solid: a UPS switchover under 10 ms, noise of 25 dB or less at 600W, Class B EMC certification, a 126W car outlet and 100W USB-C. The five-year warranty includes two years added on app registration.
Sources: ecoflow.com, ecoflow.com, ecoflow.com
Same brand
Other EcoFlow models
| Model | Capacity | AC output | Solar input | Weight |
|---|---|---|---|---|
| DELTA 3Smaller | 1,024 Wh (−1,024 Wh) | 1,800 W | 500 W | 27.6 lb |
| DELTA 3 UltraLarger | 3,072 Wh (+1,024 Wh) | 3,600 W | 800 W | Not published |
| DELTA 2 MaxSame capacity | 2,048 Wh | 2,400 W | 1,000 W | 50 lb |
Alternatives
Other brands near 2,048 Wh
| Model | Capacity | AC output | Solar input | Weight |
|---|---|---|---|---|
| Anker SOLIX C2000 Gen 2Same capacity | 2,048 Wh | 2,400 W | 800 W | 41.7 lb |
| DJI Power 2000Same capacity | 2,048 Wh | 3,000 W | Not published | Not published |
| Jackery Explorer 2000 PlusSame capacity | 2,043 Wh (−5 Wh) | 3,000 W | 1,400 W | 61.5 lb |
FAQ
DELTA 3 Max questions
Answers use the same published specs and labelled assumptions as the calculator.
How long will the DELTA 3 Max last?
2,048 Wh stored, about 1,843 Wh of it usable at the typical estimate. At its full 2,400 W rating it empties in about 38–41 min.
What is X-Boost on the DELTA 3 Max?
X-Boost lifts the limit to 3,400 W, for resistive loads (kettles, heaters) only. Motors and electronics stay capped at 2,400 W. Motor starts can briefly pull up to 4,800 W.
What is the DELTA 3 Max solar input?
Up to 500 W of panels. A single 200 W panel needs about 2.8 sunny days; panels at the full 500 W need about 5.5 peak-sun hours. Panels are assumed to deliver 75% of their rating.
Can the DELTA 3 Max run a CPAP overnight?
Yes: 4 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 Max work as a UPS?
EcoFlow lists a 10 ms switchover when wall power drops.