The power control unit model PPC520 offers a maximum output current of 500A and is compatible with all electric tunnel thrusters of 12 volts ranging from SE30 to SE60 (3.1 KW) and all 24-volt models ranging from SE50 to SE130 (6.5 KW). 48V thrusters are not compatible. The new PPC models now store historical fault codes as well as usage data (such as the amount and direction of thrust on any of the thrusters, remaining runtime, battery status, and temperature). Please note that PJC control panels must be running software v2.018 or later to support these new units. To upgrade a standard ON/OFF thruster system to PRO (variable speed control), you need a PPC power control unit and an upgrade kit for internal wiring.