It's not hard at all to install most mods in a tekkit lite server/client. All you have to do is drag the mod files into the mod folder in both the client and the server. As far as the mods from volts, you can't install them using the package that the universal electricity site gives you, you have to install the mods individually. there is one mod in that pack how ever that is not compatible and that is mekanism generators, the rest of that mod is fine but the jar file titled mekanism generators has to be deleted before you install the mekanism mod. The block id's do not conflict on anything so you don't have to worry about that.