Depending on the transistor, they can only handle so much current. The 2n3094 can't handle that much current, so I would advise you to go with a bigger power MOSFET. In my opinion, these are also easier to deal with, you just give the gate 5v and current goes through it. You can tell how much the transistor can handle by reading the schematic for the Ids max. The transistor I would advise you to use is something like this: IRF3710 MOSFET N-CHANNEL 57A 100V
I hope this helps