I want to build a backdoor shed next to my house that would house a power tool that requires 240v AC. I have an outside 110v outlet that sits on a 15Amp breaker. Can I power my tool by feeding 110v from the outside outlet using a heavy duty extension cord to a transformer like this and then connect the tool to the transformer? How do I calculate from the specs of the tool whether or not the 15Amp breaker would be enough and what sort of extension cord and transformer I would need? Or is this totally crazy?