I have one VAWT installed of capacity 100W and the turbine is connected to the Permanent magnet generator. When the wind blows turbine starts rotating and electricity will generate which is in 3 phase. After that using H bridge rectifier it is converted to DC . From that we can charge the battery. Without connecting the battery or any of the resistive load turbine rotates with normal speed, but when I connect the battery or some resistive load the speeed of the wind turbine get reduced. What is the reason behind this ? and Can I get some equivalent circuit diagram for both on load and off load conditons?