What to know about EcoFlow DELTA Pro 3 (EFDELTAPRO3-US)
Why it stands out
Why we like it
Recharging is the other strength. OutdoorGearLab measured a full recharge in 3.2 hours, about 1,293Wh per hour, so a few hours of restored grid power refills most of it between outages. EcoFlow lists it as UL9540-certified with a 5-year warranty.
What to know
Score breakdown
Usable watt-hours (tested where available), continuous output for fridges, furnace blowers and pumps, and the ability to expand for multi-day outages.
Rated charging and discharging temperatures, battery self-heating or cold-tolerant chemistry, and whether the unit holds its charge in storage.
UPS switchover time, transfer-switch or home-panel support, 120/240V output and outlet mix for household circuits.
How fast it recharges from the wall when power briefly returns, plus solar, car and generator input options during long outages.
Zero on-site emissions, battery chemistry (LiFePO4 or sodium-ion vs NMC), UL certifications, recall history, rated cycle life and warranty.
Weight, wheels and handles, display and app clarity, and fan noise in a living space.
Street price per usable watt-hour and per feature compared with similar models.
EcoFlow DELTA Pro 3 (EFDELTAPRO3-US) specs
Power
- Battery capacity
- 4096 Wh
- Continuous AC output
- 4000 W
Battery
- Battery chemistry
- LiFePO4 (LFP)
Cold weather
- Minimum charging temperature
- 32 °F
- Minimum discharging temperature
- 14 °F
Home backup
- Expandable with extra batteries
- Yes
- 240V output
- Yes
Physical
- Weight
- 114.1 lb
Support
- Warranty
- 5 years
Safety
- Notable safety certification
- UL9540
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Based on 2 retailer price observations captured during the last 90 days.