Spec Check: EcoFlow DELTA 3
EcoFlow's published DELTA 3 specs (1,024Wh, 1,800W, 3,600W surge, expandable to 5kWh) and what they mean in usable watt-hours.
Published · Updated
EcoFlow lists the DELTA 3 at 1,024Wh LiFePO4, 1,800W continuous with a 3,600W surge, 1,500W AC charging (56 minutes to full), 500W solar, a <10 ms switchover and expansion up to 5kWh. We estimate about 754 Wh usable through AC.
- 1,024Wh LiFePO4, 4,000 cycles to 80%+.
- 1,800W AC, 3,600W surge: the highest surge in our set.
- Expandable up to 5kWh; estimated ≈754 Wh usable via AC on its own.
Manufacturer specs
Figures below come from the manufacturer pages listed under Sources, copied as published. We have not measured these units.
| Spec | EcoFlow DELTA 3 |
|---|---|
| Rated capacity | 1,024Wh |
| Estimated usable (AC) | ≈754Wh (estimate) |
| Battery | LiFePO4, 4,000 cycles to 80%+ |
| AC output | 1,800W (surge 3,600W; X-Boost 2,200W) |
| Wall charging | Up to 1,500W, 0–100% in 56 min |
| Solar input | 500W max, 11–60V |
| Weight | About 27.6 lb (12.5 kg) |
| Backup switchover | <10 ms switchover |
| Expansion | Expandable up to 5kWh with EcoFlow extra batteries |
Usable capacity: our estimate
Estimated usable AC energy: 1,024 Wh × 0.80 × 0.92 ≈ 754 Wh. That's our estimate (80% usable depth from Victron's LiFePO4 data, 92% inverter efficiency from NREL's PVWatts manual; an estimate for this unit), not a measurement. Real results vary with load size, temperature and the unit's own idle draw. DC and USB loads skip the inverter loss.
| Example load | Est. runtime |
|---|---|
| 15 W | ≈50.3 h |
| 60 W | ≈12.6 h |
| 150 W | ≈5.0 h |
| 250 W | ≈3.0 h |
Run your own loads through the Power Planner.
What the specs mean
The 3,600W surge helps with motor and compressor starts. Expansion up to 5kWh makes it the most scalable unit we cover. The <10 ms switchover is the fastest published in our set. Six AC outlets suit a home desk or kitchen.
Who it suits
Outage planners who want to start at 1kWh and grow, or who run motor loads like sump pumps.
EcoFlow DELTA 3 (1,024Wh)
1,024Wh capacity and 1,800W AC output.
Check price on Amazon (opens in a new tab)FAQ
Which extra batteries work with the DELTA 3?
EcoFlow lists DELTA 3, DELTA 2, DELTA 2 Max and DELTA Pro 3 extra batteries, up to 5kWh total.
Where do I go next?
Try the power planner to put numbers to your own situation, or see the product picks on the deals page.
Terms used here
- Watt (W)
- Rate of power use or production.
- Watt-hour (Wh)
- Energy: one watt for one hour.
- Depth of discharge (DoD)
- Share of a battery's capacity that is used.
- LiFePO4 (LFP)
- Lithium iron phosphate battery chemistry.
- Inverter
- Converts DC battery power to AC household power.
- Derate
- Factor for real-world losses in solar output.
Sources
This guide is informational and based on published specifications and general references, not hands-on testing. Check the manufacturer's current specs before you buy.