Ran a 24 hour kill-a-watt test on anker S2000 with my fridge
Samsung 28 cu ft french door, about 70% full. Kitchen was 76-78F during the test.
Results over 24 hours in UPS mode:
Total consumption including station idle: about 1.45 kWh
Compressor draw when running: 135-145W
Idle between cycles: 5-7W
Compressor duty cycle: roughly 35-40% (on about 15 min, off about 25 min)
Extrapolating: I'd estimate about 32-33 hours on a full charge at this load. That's under the 35 hour claim but their test conditions specify 25°C / 77°F and a 700L fridge. My kitchen was warmer and my fridge is bigger.
The idle draw is the real story here. 5-7W is genuinely low. My old EcoFlow was pulling 18-22W idle which is where most of the battery goes overnight.