Hi, I am planning to Buy a battery and an invertor soon I am stuck with this situation as the more I research I am facing more options don't know which one to go for. Please Help me with this issue. I Want to run 3 fans 4 cfls' and a television for at least 4 four hours. I Can Afford up to 17 thousand rupees. Please Give me the good configuration to go for it would be of great help to me.

This should help:
UPS Selector Sizing Applications (http://www.apc.com/tools/ups_selector/index.cfm)
How does your Battery(s) Charged?

This solar energy site's battery load calculator (http://www.altestore.com/store/calculators/load_calculator/) may be a better tool to determine the size of the battery you need.

Enter each appliance you were talking about, add the watts, then the calculator will give you the amount of battery power needed for a certain amount of time.

Please let us know if this helps.