Larger solar panels are not necessarily a good option. The quality of each panel is affected by many factors, like wattage and warranty. Consider everything when making a hefty purchase like this.
Alchemy Talks Video on Solar Energy which is an alternative source of Energy. Tamilnadu Heat is not required for Solar as Panel functions with Light Energy.
Find out about incentives that may be available to you if you get solar panels. The federal governments offers some tax relief to people who use solar energy. Some local governments do as well. Finding out what credits you are eligible for may help you make your final decision on whether you want the panels.