EcoFlow DELTA Pro 3 Home Backup Power Station
SVT Score, Mid
4,096 Wh home station with 120/240 V from one unit, UL 9540 listed; OutdoorGearLab drew 93 percent.
$2,799
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Usability
7.1 out of 10It stores 4,096 Wh, the typical size for the home tier, so it scores 5 on capacity; OutdoorGearLab drew 3,790 Wh of it, 93 percent of rated.
Better on capacityEcoFlow DELTA Pro UltraStores 6,144 Wh per battery. $4,199Scores 10.0Its inverter supplies 4,000 W continuous at 120/240 V from one unit, so it scores 5 on power output.
Better on power outputEcoFlow DELTA Pro UltraInverter supplies 7,200 W continuous. $4,199Scores 10.0EcoFlow states 50 minutes to 80 percent and two inputs take 2,600 W of solar, so it scores 8 on recharging.
EcoFlow rates the cells for 4,000 cycles to 80 percent capacity, so it scores 8 on battery life.
It switches to battery in 10 ms, takes two extra batteries to 12 kWh per unit and works with EcoFlow's Smart Home Panel 2, so it scores 7 on backup readiness.
SGS lists it to UL 9540 as an energy storage system by model, and OutdoorGearLab's measured capacity sits within 10 percent of rated, so it scores 10 on verification.
EcoFlow's policy gives it 5 years, so it scores 8 on warranty and support.
Its warranty runs 5 years on most stations, or 3 years plus 2 on registration, with returns within 30 days.
$2,799 at us.ecoflow.com.
240 V from one box, listed to UL 9540
The DELTA Pro 3 is EcoFlow's 4 kWh LiFePO4 home backup station with 120/240 V split-phase output, a 113.5 lb unit on wheels.
It suits a buyer wiring 240 V circuits through a panel who wants one unit now and up to three later.
What we like
- 120/240 V split-phase from one unit
- UL 9540 listing by model in SGS's directory
- 3,790 Wh drawn by OutdoorGearLab93 percent of rated
- 2,600 W of solar over two inputs
- 4,000 cycles to 80 percent
What holds it back
- 113.5 lb
- AC idle draw of about 49 W in HOBOTECH's test
- 120 V charging took 3.2 hours in OutdoorGearLab's test
- 120 V and 240 V outputs cannot run together in TheSolarLab's test
- No 12 V car socket
What you’re getting
- Capacity4,000-5,999 Wh
- AC Output4,000-5,999 W
- Output Voltage120/240 V split-phase
- Battery ChemistryLiFePO4
- Rated Cycles4,000-5,999 cycles
- Safety ListingUL 2743 listed, UL 9540 listed
- Solar Input2,000-3,999 W
- Backup Switchover10 ms or less
- Warranty5 Years
- Expandable To10-19.9 kWh
- Weight113.5 lb
At a glance
- NEMA L14-30 outlet
- NEMA 6-20 240 V outlet
- Wheels and tow handle
EcoFlow Technology, Inc. is EcoFlow's US company and is owned by Shenzhen EcoFlow Innovation Technology, a private firm founded in 2017.
It sells direct from us.ecoflow.com and through Amazon US, Costco, Home Depot, Lowe's and marketplace stores at Best Buy and Walmart.
The EcoFlow DELTA Pro 3 is a 4,096 Wh LiFePO4 station rated 4,000 W continuous at 120/240 V split-phase from one unit, with four 20 A outlets, a TT-30 outlet, a 240 V NEMA 6-20 outlet and an L14-30 outlet. EcoFlow states a charge to 80 percent in 50 minutes, and it takes up to 2,600 W of solar through a high-voltage and a low-voltage input. It switches to battery in 10 ms, takes two extra batteries to 12 kWh per unit and runs up to three units through EcoFlow's Smart Home Panel 2. It weighs 113.5 lb on wheels, and EcoFlow rates the cells for 4,000 cycles to 80 percent.
