Introduction
Yes, but only if the voltage and the frequency do not fluctuate too much. The generating set’s voltage must stay between 200V and 250V. Be careful when connecting and disconnecting other loads (above 250V) because this could cause voltage drops and voltage spikes. With too high voltage spikes (above 250V), the power supply of your computer, laptop or TV can be damaged.
 
Example:
You connect your laptop (200W) to a generating set that can supply up to 3000W. If you also connect a high-beam headlamp (2000W), a voltage drop will occur. When you turn of the lamp, a voltage spike occurs, if this spike is higher than 250V, the power supply of the laptop will be damaged.
 
Regulation
Voltage regulation is possible if you use a capacitor, a variable transformer or an AVR (automatic voltage regulator).
 
When using a capacitor, some differences in voltage could arise. The voltage drops and spikes must stay between 200V and 250V to make sure that the power supply of the appliance (e.g. computer) does not get damaged.
 
You can connect a uninterruptible power supply between the computer and the generating set. This way you can be sure that your appliance’s power supply does not get damaged. When you equip your generating set with an AVR, the differences in voltage fluctuate between 1 and 2%.
 
The engine speed is proportionate to the frequency. This frequency must stay as constant as possible. The engine speed can be regulated mechanically or electronically.
 
The engine speed can deviate with 3 to 5% from the mechanical speed governor’s setting. For small generating sets (<6kVA), the frequency has to be between 47 and 52.5Hz while for bigger generating sets (>6kVA) the frequency has to be between 47 and 51.5Hz. If these generating sets do not respond quickly enough, voltage spikes will occur while switching from a heavy to a small load.
 
With electrical speed governors, the engine speed can deviate with 0.25 and 0.5% from the setting. They have a faster response time to prevent voltage drops and spikes.
 
An inverter generating set won’t have voltage fluctuations. Fluctuations in engine speed do not play a part here. Fluctuations do not influence the eventual voltage.
 
Total harmonic distortion (THD)
The lower the THD, the better. Harmonic voltages or currents are sinusoidal and have a different frequency than the fundamental frequency (50Hz or 60Hz). They are a whole multiple of the fundamental frequency.
 
Non-linear loads (e.g. a computer) cause harmonic distortions. These distortions can make the cable of a computer overheat for example. This causes the cable’s electrical resistivity to rise, which also means a rise of temperature. This could bring about a dangerous situation. If there is a too high harmonic distortion, peak currents can arise, more exhaust gases are produced and core loss can occur.
(http://en.wikipedia.org/wiki/Magnetic_core#Core_loss).
 
The grade of harmonic distortion is the proportion of the sum of all the harmonic components’ powers to the power of the fundamental frequency. For computers, the THD value can be 0.1% at the most.
 

See:
http://www.euro-index.nl/nl/klantenservice/euroinfo/netvervuiling-harmonischen/

https://lirias.kuleuven.be/bitstream/123456789/247288/1/Ryckaert_PhD.pdf    p14

http://www.danfoss.com/NR/rdonlyres/64FA3D93-3460-4EFC-8484-E6ABD7728FF6/0/Harmonics_Lock_DKDDPB41A210.pdf     p4

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