It's better to get a solar system when you own a home. Don't overextend! If you have a mortgage and you need to finance your solar energy system, you could endanger your financial security.
Don't waste your time lining the solar panels beneath an array of florescent lights--though it may sound tempting. Solar cells are not designed to generate a voltage from fluorescent light sources and this is a waste of energy of time. Any spot in the yard would be a better location for the panels.
You can be free of the power grid when you generate your own solar power. You, yourself, can get it work, making your family more independent than your neighbors. In other words, you won't need to change electric services should you move, nor will you see high electric bills anymore.
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A solar powered fan for your attic is a good choice if switching completely to solar power is not feasible. The fan will have a temperature sensitive gauge and switch itself on when necessary. This will remove heat and lower the cost of cooling. It's also solar powered, so you don't have to pay to power it.