Is it possible to convert a genset from 110volts output to 230 volts output?

Answer 1

If you are referring to normal AC output, then all you need is a 2:1 transformer. This will give you an output of 240 volts (but with less than half of the current). If you absolutely have to have 230 volts then you would need an appropriately wired transformer, I suppose, or else there are other circuitry options available.
P.S. Most generators produce bi-phasic 110-120V output, which means when using both outputs (one as ground and the other as hot) then you have in effect a 220-240 V output. This is because the output AC waves are 180 degrees out of phase with one another, so if you use one as ground or neutral, then the other is effectively 220-240V. There may be a way to simply reconfigure the wiring to accomplish this. Is that what you are asking?

Answer 2

I assume you mean a generator set.
It is possible to change the voltage, but I doubt it is a do-it-yourself project.

It can be done, but it isn't easy. In the US houses are supplied with 110-120 volts in most of the house and special connections for 220 volts. These special connections are actually just two normal connections, so you double the standard line voltage.

However, voltage and amps can be changed by the use of a transformer, in your case it would be a pretty hefty one. When you increase the voltage you will decrease the amps so you will have less power available. The power you get from a generator is limited.

Power in watts = volts X amps
The relationship between amps and volts through a transformer is more complicated and I am not going to go into it here. I really think you would need a professional electrician to do that.

If you took two generators that can provide 110 volts each then you can put them in series to try and get the 220 required voltage, but that would probably be dangerous for the generators so I would recommend you not do it. Putting the two in parallel would not give you the same voltage.

You can run a 220 volt appliance on 110 voltage, but you will need twice the power, which means more than 20 amps. No household circuit and no generator you can buy at your home supply store can carry that much amperage without melting.

Remember, when working with electricity it is amps that kills not volts.