Described is an electrical power controlling unit (1) for controlling electrical power delivery received from a direct current power source (2) to an electrical power consuming device (3), the alternating current power consuming device being driven by modulatable multiple phase alternating output current at a first voltage provided by the controlling unit, the controlling unit comprising an electrical current transformer (4), multiple outlet conductors (5) for connecting the transformer to the electrical power consuming device, command input means (6) to receive controlling commands from a controller interface (7), battery power input means (8), direct current power source input means (10) for receiving direct current from the electrical power source, a voltage converter (11), first conducting means (12) connecting the voltage converter to the current transformer, and second conducting means (13) connecting the voltage converter to a converted direct current power outlet (14).