INTRODUCTION
A change over switch is the switch which is used to switch on and off the solar power depending on the presence of other power supplied , when the power supplied is cut off the switch put the solar power on automatically and when the power supplied is available the switch put the solar power off and vice versa is true.
For those smallest businessman they can not afford to buy the existing automatic change over switch due to high cost of the device, hence they appear to be at loss when the power is cut-off, example of those smallest business
