Primus Wind Power recognizes the need for multiple types of control for your Air 40 wind turbine, so they have created a complete control system in their Primus Wind Control Panel. Everything you need is in there. It has a Stop/Run Switch, On/Off Switch, Breaker, and an Analog Ammeter to show you how many amps your Air 40 is generating. It is simple to hook up, and reads well. The 48V model comes with a 5 amp breaker. Each Wind Control Panel comes fully calibrated from the factory, and has a surface mount enclosure add on available but sold separately.