The size of generators is measured by their power, not their dimensions. Portable generators running on fuel can be categorized into 3 brackets. These are less than 2000 watts, 2000 – 7000 watts and 7000 watts or more.

Portable generators with a power of less than 2000 watts are the lightest and are usually hand-carried with a handle. Most of these models are less than 70 pounds.

The dimensions of a portable generator between 2000 watts and 7000 watts vary greatly. These models can be a hand-carry design or built like a cart with wheels.

The more power, the bigger the generator dimensions. The most powerful portable generators are heavy, anywhere from 200 pounds to 300 pounds. These are considered heavy-duty models. They often have a protective design with never flat tires.