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EcoFlow DELTA Pro sizing guide
The whole-home contender on wheels — 3,600 W, expandable to 25 kWh, panel-ready with a transfer switch. Here's exactly what it runs, how long, and which outages it covers — computed, not marketed.
AC + EV charging; expandable to 25 kWh · 99 lb · 5× AC (incl. 30 A), USB-A/C · expandable with add-on batteries.
What the DELTA Pro runs — and for how long
| Appliance | Running | Runs it? | Approx. runtime |
|---|---|---|---|
| Refrigerator (modern) | 150 W (1,200 W surge) | yes | ~62 h |
| Chest Freezer | 100 W (1,000 W surge) | yes | ~93 h |
| CPAP Machine (no humidifier) | 40 W | yes | ~81 h |
| CPAP with Heated Humidifier | 60 W (95 W surge) | yes | ~68 h |
| Oxygen Concentrator | 350 W (600 W surge) | yes | ~9.3 h |
| Space Heater (1500 W) | 1,500 W | yes | ~2.2 h |
| Window AC (8,000 BTU) | 715 W (1,250 W surge) | yes | ~6.5 h |
| Window AC (12,000 BTU) | 1,100 W (1,800 W surge) | yes | ~4.2 h |
| Gas Furnace Blower (1/2 HP) | 800 W (2,350 W surge) | yes | ~8.1 h |
| Microwave (1000 W cooking) | 1,200 W | yes | ~2.7 h |
| Sump Pump (1/3 HP) | 800 W (1,500 W surge) | yes | ~20 h |
| Sump Pump (1/2 HP) | 1,050 W (2,150 W surge) | yes | ~15 h |
| Well Pump (1/2 HP) | 1,000 W (2,100 W surge) | yes | ~22 h |
Runtime uses each load's duty-weighted average draw against 90% of the rated capacity — conservative on purpose. Cyclic loads (fridges, pumps) run far longer than running-watts × capacity would suggest.
Outages the DELTA Pro covers
Common questions
What can the EcoFlow DELTA Pro run?
With 3,600 W of continuous output and a 7,200 W surge rating, the EcoFlow DELTA Pro runs refrigerator (modern), chest freezer, cpap machine (no humidifier), cpap with heated humidifier, oxygen concentrator, space heater (1500 w), and more. Its 3,600 Wh battery sets how long: a fridge for roughly a day, a CPAP for several nights.
How long will the EcoFlow DELTA Pro run a refrigerator?
A modern refrigerator averages about 53 W (it cycles ~35% of the time), so the EcoFlow DELTA Pro's 3,600 Wh runs one for roughly 62 h before recharging.
Specs: Manufacturer published specifications (approximate; confirm on the current product page) (compiled 2026-06-15). Informational only — a computed sizing estimate from published appliance-wattage charts and manufacturer station specs. It is not an electrical guarantee. For hardwired or whole-home backup, transfer switches, or any permanent install, consult a licensed electrician.