I recently got Tekkit and got IC2 for it today, because I really wanted the solar arrays. Well I tried to craft the solar arrays, nothing, followed the recipe for the lv one exactly, but it didn't give me the lv solar array. So I went into creative to search for them. Didn't find them, even opened not enough items to try to find them. They just aren't in my game.
Are they an add on I need to get for it, or anything special like that?
Any help will be greatly appreciated.