BLOCK DIAGRAM

BLOCK DIAGRAM

Figure1:block diagram.

2.1) BLOCK DIAGRAM EXPLANATION

Here we are using PIC16F877A as the major component. Which will control all actions and provide basic protection based on the program.

We have a 12V rechargeable battery and a 12V  solar panel ,on day time the solar panel will provide 12V ,which will charge the battery and provide 12V constant load.The charging is controlled by the Relay 1.If the battery is full then the relay get energized. So Relay 1 will provide over charge protection.

The relay switch RL2 is used to protect the battery from over load. When an overload is occurred, the relay switch RL2 is energised and it disconnects load from battery. The relay will be de-energised when the overload reset switch is pressed.

The voltage at the battery is continuously displayed on the LCD using the built-in ADC module in the PIC 16F877A. The voltage is divided by 3 by using 3 equal value resistors and 1/3 voltage is send to ADC input.