This was my last attempt to create the solar factory. Downsides and problems is that the chest is duplicating furnaces always take the first top item so you going to have to manually fill up. In other things it's smaller it's faster and yes it's even smaller than you think solar panels it can make at least over three stacks of 64 under 15 or 20 minutes.

Also I am NOT remaking the Solar factory on Tekkit classic anymore it's the best I could do it for the third time.