Another way of connecting a generator to the house without a transfer switch is to wire it directly to the main electric panel. Wiring a generator to the panel is not recommended because it is a very dangerous method. However, you can connect the generator directly to the main electrical panel by using a subpanel.

Can I get 240 volts from my 120 volt generator?

To increase voltage from 120 to 240 volts, you will need a step up transformer with a turn ratio of 1:2. For example, a standard 120-volt, 15-amp household power outlet will be transformed into 240 volts at 7.5 amps, both outputting a maximum of 1,800 watts.