There are two options before you, while looking for how to build solar panels. First one is that you can simply download the instructions about how to build solar panels in your home and purchase the different components of the solar panel from the market. The second option is to buy a complete how to build solar panels kits that will include everything from the components of the solar panel to the step by step instructions. Now, it depends on you to decide which one to choose for your homemade solar panels. Either of them would cost you far less than purchasing a commercial solar panel.