Now you can build a single panel or a complete array of panels to power your home for a fraction of retail cost Having a company putting up a solar system at your house could easily cost you between $10.000 and $20.000 , forcing you to come up with this cash, or paying (with added interest) for yearst o come. However, buying the solar cells and putting them together yourself will greatly ( And I mean GREATLY ) reduce the cost of your solar system. Problem is you probably are no electrician…