[header] How to set up a grid tied pv system at home [title] Consider how much electricity your family really needs each day or month. [step] This is important because the system includes a few solar panels and each of them has a certain amount of capacity in generating electricity. If you have a clear calculation of this problem, you won't waste your budget for purchasing these panels or buy less than needed. 
Maybe you don't know about how much electricity your family needs each day or month because you just pay the bill with money. This time you can check out this figure by viewing the power meter installed in your house.