Standby generators come in sizes ranging in power from 9 to 48 kilowatts (kW) and cost from $500 to $18,000. One of the best standby generators with about 20 to 24 kW can power most of a home’s ...

They’re about the size of a central air conditioning unit ... watts of power but often run longer on propane than larger standby generators. Note that while smaller models are less expensive ...