Battery.. Invertor For A Fan.... Need Help..!

Hi, I want to power a table fan (50 watts) using a battery. In India the input power to appliances (fan in this case) is 220 volts / 50 Hz. so can i power the fan with TWO 6 volts 4.5 AH sealed lead acid battery??

Can u please tell me how to do the power calculations? i want my fan to run for abt 4 hours. how many batteries do i need?



(im planing to charge the battery using solar panel but thats another question)
      


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