If you are running low power, there are some holes in the middle that you can use to jumper the left and right sides. I just cut some short pieces of either 12 or 14 guage wire and soldered them in place - there should be instructions in the manual. This limits you to ~15 amps for 16 channels, but if you only run a string or two per channel or are using LEDs, you should be fine. I bought one of those kill-o-watt watt meters and checked my strings before I started putting things up just to make sure I would be OK.
RM