Simply plug a universal power supply (laptop style) into either of the barrel plugs on the 4HP panel

Connect your modules via flying-bus cables or the Bus Stick

For custom power systems, the Row Power 40 has a set of easily soldered holes for using large gauge wire or MTA156 connectors to connect to distribution bus boards
 
Multiple Row Power modules can be powered from a single power brick by daisy-chaining with an inexpensive barrel cable