In this paper, a power conditioner that can generate power into the utility from a 10 kW windmill is introduced and developed. This equipment utilized inexpensive diode rectifier plus boost converter in the first stage and V-connection type inverter that has the merit of using high DC voltage in the next stage. The operation of this equipment was verified, the characteristics were evaluated and the practicability was confirmed experimentally. The equipment is deployed with ground fault detection function, and because of the transformer-less utility, it is efficient and has the advantage of generating less loss compared to its counterpart.