EDIT: Note that solar panels and arrays may have translucent blocks over head, such as glass. I incorrectly stated that you can't have any blocks overhead.
This video covers the basics of Solar Panel and Array construction and includes a brief demonstration of power generation after installation.
The IC2 mod is created by Alblaka and can be found here: http://www.industrialcraft.net/
The IC2 mod is included in the Technicpack Launcher and can be found here: http://www.technicpack.net/