Patent attributes
The invention relates to a method for operating an on-board electrical system (1) for a motor vehicle, wherein the on-board electrical system (1) has a low-voltage electrical subsystem (21) with at least one low-voltage load (29) and a starter (26), and has a high-voltage electrical subsystem (20) having at least one high-voltage load (25) and one electrical generator (23), wherein the high-voltage electrical subsystem (20) is connected to the low-voltage electrical subsystem (21) by means of a coupling unit (33) which is designed to draw energy from the high-voltage electrical subsystem (20) and to supply energy to the low-voltage electrical subsystem (21), wherein the high-voltage electrical subsystem (20) has a battery (40) which is designed to generate the high voltage and output said high voltage to the high-voltage electrical subsystem (20), and which has at least two battery units (41-1, 41-2, . . . , 41-n) with line sections (80-11, 80-12, . . . , 80-n2) which are routed to the coupling unit (33). In this case, the coupling unit (33) is designed to selectively connect the battery units (41-1, 41-2, . . . , 41-n) to the low-voltage electrical subsystem (21). The invention also relates to a motor vehicle comprising an internal combustion engine and an on-board electrical system (1) of this kind.