Hi Mparadis, Thanks for your reply. Do you have recommend relay product, it can used at 10A~12A(@8V, and 7A@14V)? And the wire connector size can use about 8 AWG size. Another question, if we still keep the PhidgetInterfaceKit 0/0/4, but use 2 channel to split the current of 10A. is it recommended? ...