As I know, there should no be "limit".
But keep in Mind that Energy Tesseracts lose 25% of the MJ that are comes out of an Tesseract. (It was Changed, maybe is it current Only 5%?)
And Receiving Item/Liquid Tesseracts share there income evenly. (No Lose
now)
I currently Build my Bee HQ and use Tesseracts to save Pipes (and Lag from them). I Only have ~10 Sending Tesseracts and 1 Receiving. This Tesseract sort all Combs, etc. and Receives from the Centrifuge Again
But i Discovered by accident, that Tesserects are able to get (Only Get) Items from Redpower Tubes. That saved a lot Space for me