Is is really cost effective to buy home solar power system?
depending on the size of the house and the amount of sun you get. solar units are more efficient and cost less than they did 10 years ago. some units will generate enough power that you will actually have excess that some power companies will allow you to sell back into the grid.
if your municipality allows this i would not worry about battery storage. just use the solar when you can, sell power back during the day when your usage is lowest, and be energy aware at night when you use the most.
with the cost of today's systems you could have the whole thing paid for in 4-5 years and start seeing a return. a good system should last at least 20.