The comparison charts show inverter generators to be the most fuel efficient, and lowest noise. Also, they should be much easier on your sensitive electronics as they maintain a precise 60 hertz generated power frequency, due to the fact that the generators directly make D.C. power, which is input into an inverter power electronic circuit, and this electronic circuit makes the A.C. power waveform. Conventional alternator generators depend on motor speed for the frequency of the output power, and sudden increases in electrical load can slow down the motor until the auto throttle gets it back to the correct speed. This causes the 60 hertz output power to be lower in frequency.