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EcoFlow DELTA 3 Plus sizing guide
The newer-generation replacement for the DELTA 2 class — same 1 kWh capacity, faster charging, higher 3,600 W surge. Here's exactly what it runs, how long, and which outages it covers — computed, not marketed.
X-Stream: 0-100% in 56 min AC; expandable to 5 kWh with a DELTA Pro 3 extra battery · 28 lb · 6× AC, 2× USB-A, 2× USB-C · expandable with add-on batteries.
What the DELTA 3 Plus runs — and for how long
| Appliance | Running | Runs it? | Approx. runtime |
|---|---|---|---|
| Refrigerator (modern) | 150 W (1,200 W surge) | yes | ~18 h |
| Chest Freezer | 100 W (1,000 W surge) | yes | ~26 h |
| CPAP Machine (no humidifier) | 40 W | yes | ~23 h |
| CPAP with Heated Humidifier | 60 W (95 W surge) | yes | ~19 h |
| Oxygen Concentrator | 350 W (600 W surge) | yes | ~2.6 h |
| Space Heater (1500 W) | 1,500 W | yes | ~0.6 h |
| Window AC (8,000 BTU) | 715 W (1,250 W surge) | yes | ~1.8 h |
| Window AC (12,000 BTU) | 1,100 W (1,800 W surge) | yes | ~1.2 h |
| Gas Furnace Blower (1/2 HP) | 800 W (2,350 W surge) | yes | ~2.3 h |
| Microwave (1000 W cooking) | 1,200 W | yes | ~0.8 h |
| Sump Pump (1/3 HP) | 800 W (1,500 W surge) | yes | ~5.8 h |
| Sump Pump (1/2 HP) | 1,050 W (2,150 W surge) | yes | ~4.4 h |
| Well Pump (1/2 HP) | 1,000 W (2,100 W surge) | yes | ~6.1 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 3 Plus covers
Common questions
What can the EcoFlow DELTA 3 Plus run?
With 1,800 W of continuous output and a 3,600 W surge rating, the EcoFlow DELTA 3 Plus runs refrigerator (modern), chest freezer, cpap machine (no humidifier), cpap with heated humidifier, oxygen concentrator, space heater (1500 w), and more. Its 1,024 Wh battery sets how long: a fridge for roughly a day, a CPAP for several nights.
How long will the EcoFlow DELTA 3 Plus run a refrigerator?
A modern refrigerator averages about 53 W (it cycles ~35% of the time), so the EcoFlow DELTA 3 Plus's 1,024 Wh runs one for roughly 18 h before recharging.
Specs: Manufacturer published specifications (approximate; confirm on the current product page) (compiled 2026-08-10). 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.