Generators come in two basic configurations -- manual or automatic start. Manual start systems enable users to get by with smaller generators, provided that all equipment is not restarted at the same time.

Automatic standby systems, however, must be capable of starting and running all equipment connected to them. They must be large enough to provide both the start-up and continuous power needed by all motors, as well as that needed by the lights and appliances in the home, business or farm.