How long will a 1,000 Wh power station run a refrigerator (full-size)?
Short answer: about 14 hours. The math: 1,000 Wh rated × 0.85 inverter efficiency = 850 Wh delivered, ÷ 60 W average draw = 14.2 hours.
Runtime at a glance
Battery state
Usable energy
Runtime
New battery
850 Wh
14 h
~2 years old (80%)
680 Wh
11 h
~4 years old (60%)
510 Wh
8 h
One more check: a refrigerator (full-size)'s compressor briefly surges to ~900 W at start-up — any modern 1,000 Wh-class unit handles that, but pocket-size units may not.
Converting DC battery power to AC wall power loses roughly 15% in the inverter. Manufacturers quote the battery's rated Wh, not what reaches your appliance.
What shortens the runtime?
Battery age (−20% per ~2 years), cold weather, and the display/inverter idle draw on small loads. Treat 14 hours as a good-conditions estimate; plan on ~11 for an older unit.
What if I run other things at the same time?
Runtime divides across loads: add a 12 W router and the same battery lasts about 12 hours instead.