Some highly rated portable generators as of 2015 include the Yamaha EF5500DE, Sportsman Series GEN7500DF and Honda EM5000S models. These models feature a maximum power output that ranges from 4,500 to 6,000 watts, and they’re capable of supporting 10-second power surges of up to 7,500 watts. Among the three, only the Sportsman Series GEN7500DF model supports both gasoline and propane as the fuel source.
The fuel capacity of these models ranges between 6.2 and 6.9 gallons, while the fuel efficiency goes as low as 0.55 gallons per hour, allowing the most efficient model, the Honda EM5000S, to run for up to 11 hours at 50 percent of the maximum power output. The Yamaha EF5500DE and Honda EM5000S models also feature a mode of operation that allows them to idle down automatically when the power load lessens, which improves the overall fuel efficiency.
Unlike other highly rated portable generators, such as the Westinghouse WH5500 and WEN 5500 models, the Yamaha EF5500DE, Sportsman Series GEN7500DF and Honda EM5000S models include the ground-fault circuit interruption safety feature, which protects against electrocution when the flow of electricity changes direction. This safety feature is useful when operating portable generators in wet conditions because it automatically shuts off power whenever it detects that the electrical current from the generator differs from the current that returns to the generator.