Not worth it. The key component to electrical power generation and application is to generate the power exactly in the form of intended use. If you need to run 3 phase equipment, you generate 3 phase power. If you need to run single phase equipment, it is never cost effective or efficient to generate 3 phase power and convert.
The only exception is in grid applications... In a grid application 3 phase is cheap and easy to produce, then at the application end of the grid (residential subsection) you separate the phases at the substation and deliver one leg to each subsection of the grid.
In a small stand alone operation the transformer costs, and core losses, make conversion prohibitive, even if the generator is free.