Abstract: The subject matter of the invention is a backup power system configured to be a UPS system, with a customer generation system and with a network monitoring device with a switch topology including a first connection node, that is connected to the customer generation system that is connected to at least one automatic disconnection switch including a first switch said first switch being disposed between the customer generation system and a utility grid, and that is connected to a second switch that is connected to one or several loads, said system including a second connection node that is connected to said second switch connected to said load, that is connected to a third switch disposed between the utility grid and the load and that is connected to a fourth switch to which there is connected a standalone inverter with a storage device, and said system including a third connection node, connecting said first switch and said third switch to said utility grid, said customer generation system supplying an AC volta

Abstract: The subject matter of the invention is a backup power system configured to be a UPS system, with a customer generation system (5) and with a network monitoring device with a switch topology a. including a first connection node, a.1 that is connected to the customer generation system (5) a.2 that is connected to at least one automatic disconnection switch including a first switch (411, 412), said first switch (411, 412) being disposed between the customer generation system (5) and a utility grid (1), and a.3 that is connected to a second switch (44) that is connected to one or several loads (6), b. said system including a second connection node (9) b.1 that is connected to said second switch (44) b.2 connected to said load (6), b.3 that is connected to a third switch (43) disposed between the utility grid (1) and the load (6) and b.4 that is connected to a fourth switch (45) to which there is connected a standalone inverter (7) with a storage device (71), c.