The amount of power produced will depend upon how large the system is. In India the average residential customer purchases 5,500 kilowatt-hours (kWh) per year. There is enough sunshine falling upon on the average home to produce this and a system can be designed to offset all electrical needs. The cost to accomplish a 100% system may be prohibitive and sometimes it makes more sense to simply reduce your consumption. Some utilities use tiered rates when they charge for consumption which means that the more energy you use the higher is the cost per kilo-watt-hour. The most economically feasible size is usually between 50% and 75% of your annual household needs.
The savings will depend on the size of your solar system and the amount of electricity you would normally have consumed. A 2kW PV system which is replacing electricity at 5.50 INR a kWh might save INR16000.00 per year.
PV technology produces electricity directly from electrons freed by the interaction of sunlight with a solar panel made of semiconductor material. The power provided is direct current (DC) electricity. The basic building block is known as a cell. Many cells put together are known as a module, and many modules assembled together form an array. A PV system will consist of an array of modules generating DC electricity, an inverter, and sometimes battery storage back up with charge controller.