I'm pretty new to this whole thing, but I found it necessary to add 1 mod: Engineer's Toolbox, and for 1 reason: getting Galacticraft solar panels to power Thermal Expansion machines.
I wanted a fully renewable power source, and the solar panels seemed right up my alley. However, I couldn't find any way to convert the MJs to RFs. So I added Engineer's toolbox, really just for 1 block - their MJ Adapter, which does exactly what I'm looking for. The rest of the mod does seem pretty decent though - it's focused on sort of modular socketed machines, somewhat like a cross between steve's carts and thermal expansion.
Anyway, unless I missed something and there is a way currently to do that MJ -> RF conversion, perhaps adding this mod would be a good idea.