Short answer
The DELTA Pro is most useful when you want meaningful backup capacity without committing immediately to a permanently installed home battery. Its published base specification is 3.6 kWh of storage and 3,600 W of AC output, with expansion options up to 25 kWh. That is enough output for many household loads, but runtime depends entirely on what you connect.
| Base capacity | 3.6 kWh |
|---|---|
| Continuous AC output | 3,600 W |
| Published expansion range | Up to 25 kWh with compatible equipment |
| Battery chemistry | LFP |
| Published warranty | 3 years standard, plus 2 years after app registration |
| Best fit | Portable or staged home backup, renters, workshops, and users who want expandable storage |
Source: EcoFlow US product page, checked 26 August 2026. Promotions and bundle pricing change frequently.
What 3.6 kWh means in practice
Usable runtime is lower than a simple battery-capacity division because the inverter, battery management system, cabling, and connected equipment consume energy. A rough planning allowance of 80–90% usable AC energy is reasonable, but real performance varies.
- A 120 W refrigerator load cycling half the time may run for roughly a day or more.
- A continuous 500 W combined load is a several-hour use case, not an all-day one.
- High-power heating loads can be within the inverter rating but drain the battery quickly.
For critical-load backup, list the actual wattage and daily run time of the refrigerator, networking, lighting, medical equipment, and any pumps before choosing a battery size.
Where it makes sense
- No-install backup: Run selected appliances from the unit without a fixed battery installation.
- Expandable system: Start at 3.6 kWh and add compatible batteries or home-integration equipment later.
- Multiple uses: Move the same battery between home backup, a workshop, RV, or remote site.
- Solar charging: Pair it with compatible portable panels where the site and weather make this practical.
Reasons to choose something else
- You need seamless whole-home backup with automatic transfer and no manual load management.
- Your critical loads include large HVAC, electric resistance heating, or long-running pumps.
- You want the lowest cost per installed kWh and never need portability.
- You need a system designed, permitted, and warranted as part of a permanent solar installation.
Check the current EcoFlow offer
Compare the base unit, extra-battery bundle, solar bundles, delivery terms, and warranty before buying.
View DELTA Pro at EcoFlow →Direct manufacturer link. No commission tracking is active on this button at present.
Frequently asked questions
Can it run a refrigerator?
Yes. The published AC output is sufficient for a typical refrigerator, but runtime depends on compressor cycling, other connected loads and conversion losses.
Can it power a whole home?
Treat the base unit as selected-load backup. Whole-home use requires compatible integration equipment, careful load management and potentially additional battery capacity.
Is it a substitute for a fixed home battery?
Sometimes, but not always. A permitted fixed system may be better for seamless automatic transfer, large loads or the lowest installed cost per kWh.
Methodology
This guide is based on EcoFlow's published US specifications and terms. SolarStateData has not claimed physical testing of this unit. The page will be updated when specifications, warranty terms, or the product line change.