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EcoFlow DELTA Pro Ultra sizing guide
EcoFlow's flagship whole-home system above the DELTA Pro and DELTA Pro 3 — base unit is inverter (70 lb) + battery (111.8 lb), expandable to 30 kWh with one inverter stack and 90 kWh with three. Here's exactly what it runs, how long, and which outages it covers — computed, not marketed.
8,800 W combined AC+solar fast charge (two batteries full in ~2 h); 5.6 kW max solar input · 182 lb · 4× AC 120V/20A, 1× AC 120V/30A, 1× NEMA L14-30 120/240V split-phase, USB-A/C · expandable with add-on batteries.
What the DELTA Pro Ultra runs — and for how long
| Appliance | Running | Runs it? | Approx. runtime |
|---|---|---|---|
| Refrigerator (modern) | 150 W (1,200 W surge) | yes | ~105 h |
| Chest Freezer | 100 W (1,000 W surge) | yes | ~158 h |
| CPAP Machine (no humidifier) | 40 W | yes | ~138 h |
| CPAP with Heated Humidifier | 60 W (95 W surge) | yes | ~115 h |
| Oxygen Concentrator | 350 W (600 W surge) | yes | ~16 h |
| Space Heater (1500 W) | 1,500 W | yes | ~3.7 h |
| Window AC (8,000 BTU) | 715 W (1,250 W surge) | yes | ~11 h |
| Window AC (12,000 BTU) | 1,100 W (1,800 W surge) | yes | ~7.2 h |
| Gas Furnace Blower (1/2 HP) | 800 W (2,350 W surge) | yes | ~14 h |
| Microwave (1000 W cooking) | 1,200 W | yes | ~4.6 h |
| Sump Pump (1/3 HP) | 800 W (1,500 W surge) | yes | ~35 h |
| Sump Pump (1/2 HP) | 1,050 W (2,150 W surge) | yes | ~26 h |
| Well Pump (1/2 HP) | 1,000 W (2,100 W surge) | yes | ~37 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 Ultra covers
Common questions
What can the EcoFlow DELTA Pro Ultra run?
With 7,200 W of continuous output and a 10,800 W surge rating, the EcoFlow DELTA Pro Ultra runs refrigerator (modern), chest freezer, cpap machine (no humidifier), cpap with heated humidifier, oxygen concentrator, space heater (1500 w), and more. Its 6,144 Wh battery sets how long: a fridge for roughly a day, a CPAP for several nights.
How long will the EcoFlow DELTA Pro Ultra run a refrigerator?
A modern refrigerator averages about 53 W (it cycles ~35% of the time), so the EcoFlow DELTA Pro Ultra's 6,144 Wh runs one for roughly 105 h before recharging.
Specs: Manufacturer published specifications (approximate; confirm on the current product page) (compiled 2026-10-05). 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.