The wind turbines and solar modules are power generation components. Controller regulate and control the power. One hand, send the adjusted power to the DC or AC load. On the other hand, save the superfluous power in the battery. When the power is not enough for the load, the controller will send the battery’s power to the load. When the battery is charges full, the controller will start the protection of over-charging. When the battery is empty, the controller will start the protection of over-discharging. If the controller’s performance is bad, it will bring the load impact on the battery’s life time, even on the system’s reliability. The battery is to store the power, in order that there is power used for AC/DC load during rainy/cloudy days. The inverter is to convert the DC power to DC power for AC load.