Board Thread:Questions and Answers/@comment-68.195.127.46-20140311012348/@comment-1757231-20140315015221

50.129.153.64 wrote: I think the Mass Fab only takes in 512 E/U per tick, any more than that, and it is wasteful.
 * cough HV Transformers

As to the OP, efficiency drops after its one UU per tick.

Also, please use Recyclers. They use so much less EU. Really, all you need is 2 HV Solar Panels plus Overlclocked Recyler + HV for epic awesomeness.