ELECTRIC SYSTEM OF A ROAD VEHICLE PROVIDED WITH A DC-DC ELECTRONIC POWER CONVERTER

An electric system (17) of a road vehicle (1); the electric system (18) has: a high-voltage electric circuit (18) provided with a first storage system (14); a low-voltage electric circuit (19) provided with a plurality of electrical loads; and a DC-DC electronic power converter (25), which connects the low-voltage electric circuit (19) and the high-voltage electric circuit (18) to one another. The DC-DC electronic power converter (25) has: a high-voltage input (26); a low-voltage output (28); a conversion device (27); a control unit (31), which controls the conversion device (27); and a second storage system (29) connected to the low-voltage output (28). The control unit (31), only when the vehicle (1) is parked, is configured to detect a state of charge of the second storage system (29) and to activate the conversion device (27) only when the state of charge of the second storage system (29) is below a charge threshold to charge the second storage system (29) .