This circuit is ideal if you need 240V for a small appliance away from mains. It says it will drive up to 70W peak but we would rate it at 30W RMS max. (Not really RMS as it is square wave). In addition to this kit you will need 2 x Heatsinks such as HH-8560 (page ?) and a step-up transformer such as the MM-2015 or, better MM-2016 (page ?)
Tip: If you have a big 12-0-12/240 transformer in your junk box this will end up a cheap inverter.