According to Predator, the 9000-Watt Gas Powered Portable Generator can run for up to 13 hours at 50 percent load. It has a 4.8-star average rating from more than 2,100 reviews on Harbor Freight.

This wattage varies from one generator to another, with smaller units delivering 1000 - 3000 watts, midsize models with 3000 - 5000 watts, and the largest machines pumping out up to 9000 watts.

The size of the generators varies and can exceed 250 pounds, generate 5,000 watts or more, and power a house, according to Consumer Reports. The generators throttle up and down to match demand ...

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