5,000-watts will run about 20Amps-at-240VAC or 40Amps-at-120VAC (4,800-watts).
Most-household-appliances have nameplate-ratings in Amps, Volts, and/or Watts.
Depending on the size of your:
air-conditioner, heater, oven/range/stove, water-heater, ...
it will not run most of those at full-power,
you can however select lower/non-full-power settings.
5,000-watts will run most household-lighting and modern-electronics.
Your whole-household-electric-panel-maximum is about 24,000-watts to 48,000-watts