How Long Will the EcoFlow DELTA Pro Ultra Run a Refrigerator?
Quick answer
About 30 hours of refrigerator run time on a full charge - and because a fridge compressor cycles on and off (roughly half the time in a closed, cool kitchen), that is typically 30-60 hours of wall-clock time before the station is empty.
The math
A typical full-size refrigerator draws about 175 running watts while its compressor runs and roughly 900 W for a fraction of a second at compressor start - typical values, labeled as such; your fridge's label states its actual draw. The EcoFlow DELTA Pro Ultra stores 6,144 Wh. Allowing about 15% for inverter and conversion losses (a stated allowance, not a measurement): 6,144 x 0.85 / 175 = about 29.8 hours of compressor run time.
| Figure | Value |
|---|---|
| Station capacity | 6,144 Wh |
| Station continuous output | 7,200 W |
| Approx. price | Around $4,400 |
| Fridge running draw (typical) | 175 W |
| Run time at continuous draw | About 29.8 hours |
| Typical wall-clock range (compressor cycling) | About 30-60 hours |
The EcoFlow DELTA Pro Ultra's continuous output (7,200 W) comfortably exceeds both the fridge's 175 W running draw and its roughly 900 W compressor starting surge, so starting the fridge is not a problem. Runtime is the only question, and the math is capacity divided by draw.
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Keeping the fridge cold longer
Runtime stretches with behavior, not accessories: keep the door closed (a closed fridge holds safe temperatures for hours on its own), keep the station topped up from solar or a vehicle while the outage runs, and don't plug the microwave into the same station during fridge duty. Manufacturer notes for this model: Whole-home capable with Smart Home Panel; stackable to 90kWh.
FAQ
Does the starting surge really matter for a battery station?
Yes - it is the most common reason a small station fails at fridge duty. The surge lasts a fraction of a second, but if the inverter can't supply it, the compressor doesn't start and the station may shut down entirely.
How accurate is the cycling estimate?
It is a range on purpose. A fridge in a cool kitchen, opened rarely, cycles less and lasts toward the top of the range; a fridge in a hot garage during a summer outage works harder and lands at the bottom. Treat the continuous-draw figure as the floor you can count on.