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EcoFlow DELTA Pro 3 sizing guide
A 4 kWh, 4,000 W (120/240 V) system built specifically for whole-home backup. Here's exactly what it runs, how long, and which outages it covers — computed, not marketed.
AC/solar/EV; expandable to 48 kWh · 113 lb · 120/240 V AC, USB-A/C · expandable with add-on batteries.
What the DELTA Pro 3 runs — and for how long
| Appliance | Running | Runs it? | Approx. runtime |
|---|---|---|---|
| Refrigerator (modern) | 150 W (1,200 W surge) | yes | ~70 h |
| Chest Freezer | 100 W (1,000 W surge) | yes | ~105 h |
| CPAP Machine (no humidifier) | 40 W | yes | ~92 h |
| CPAP with Heated Humidifier | 60 W (95 W surge) | yes | ~77 h |
| Oxygen Concentrator | 350 W (600 W surge) | yes | ~11 h |
| Space Heater (1500 W) | 1,500 W | yes | ~2.5 h |
| Window AC (8,000 BTU) | 715 W (1,250 W surge) | yes | ~7.4 h |
| Window AC (12,000 BTU) | 1,100 W (1,800 W surge) | yes | ~4.8 h |
| Gas Furnace Blower (1/2 HP) | 800 W (2,350 W surge) | yes | ~9.2 h |
| Microwave (1000 W cooking) | 1,200 W | yes | ~3.1 h |
| Sump Pump (1/3 HP) | 800 W (1,500 W surge) | yes | ~23 h |
| Sump Pump (1/2 HP) | 1,050 W (2,150 W surge) | yes | ~18 h |
| Well Pump (1/2 HP) | 1,000 W (2,100 W surge) | yes | ~25 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 3 covers
Common questions
What can the EcoFlow DELTA Pro 3 run?
With 4,000 W of continuous output and a 8,000 W surge rating, the EcoFlow DELTA Pro 3 runs refrigerator (modern), chest freezer, cpap machine (no humidifier), cpap with heated humidifier, oxygen concentrator, space heater (1500 w), and more. Its 4,096 Wh battery sets how long: a fridge for roughly a day, a CPAP for several nights.
How long will the EcoFlow DELTA Pro 3 run a refrigerator?
A modern refrigerator averages about 53 W (it cycles ~35% of the time), so the EcoFlow DELTA Pro 3's 4,096 Wh runs one for roughly 70 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.