Portable generators

What the machine contains

The engine supplies mechanical power to an alternator. The assembly also includes a fuel system, controls, cooling arrangements and electrical receptacles with protective devices. Some units add an inverter stage between the alternator and the final AC output. Starting may be manual recoil or electric, depending on the model. [1][2]

Portability describes the ability to move the equipment; it does not imply that the unit is light enough for one person to carry. A wheel kit, lifting points and the manufacturer’s transport instructions describe how a particular model is moved.

Rated output and available connections

Continuous, rated or running output describes the sustained electrical load the generator can supply under its specified conditions. A maximum or starting rating describes a temporary capability and must be interpreted with its permitted duration. A high starting rating cannot be treated as continuous capacity. [2]

Each receptacle and its protective circuit also has a limit. A generator’s total output may exceed what can pass through one connection. Voltage, circuit arrangement and breaker ratings therefore matter alongside the headline wattage. Adding the capacities printed on every outlet does not increase the machine’s total available power. [3]

Supplying appliances or building circuits

Cord-connected equipment can receive power from the generator’s receptacles when the cords and equipment are suitable for the application. Supplying fixed building wiring requires correctly installed transfer equipment to prevent an unsafe connection between generator and utility power. Grounding and neutral bonding depend on the generator and connection arrangement; they are system design questions. [4]

Operating conditions

Combustion-powered portable generators produce carbon monoxide, including inverter models. CPSC directs users to operate them outdoors at least 20 feet from homes, with exhaust directed away from buildings. A garage, shed or partly enclosed area is not an outdoor operating location. [5]

The operating manual determines refueling, weather protection, maintenance and shutdown procedures. Running time depends on fuel supply and electrical demand. The portable label does not remove the need to check starting loads, voltage compatibility and individual circuit limits.