In the early 90's an elderly neighbor had a smaller (1.5 kw?) Mite-E-Lite with a 3-1/2 HP B&S engine.
It ran pretty much non-stop for 8 or 9 days during an area-wide power outage (ice storm). It powered his sump pump, the boiler circ pump and a couple small lights.
Only problem is the generator's tank held only enough fuel for about 1-1/2 hours of operation. Otherwise it seemed like a decent unit.