An interface module (120) includes a first side (120a) having a plurality of input connectors (121a-f) of a same cross-sectional area corresponding to a same amperage rating, a second side (120b) having a plurality of output connectors of different cross-sectional areas from each other corresponding to different amperage ratings from each other, and wiring (122a-c) in the interface module configured to connect a first number of input connectors to a first one (123a) of the output connectors having a first amperage rating, and configured to connect a second number of input connectors to a second one (123b) of the output connectors having a second amperage rating different from the first amperage rating.