Energy supply system (1, 1', 100, 100') with battery monitoring, comprising several electrochemical energy storage packages (3, 3', 3", 3"', 103, 103', 103", 103'", 103 IV, 103 V, 203, 403, 503, 503', 703, 803), wherein each of these energy storage packages (3, 3', 3", 3'", 103, 103', 103", 103'", 103'", 103 V, 203, 403, 503, 503', 703, 803) has at least two energy connections (26, 26', 26", 26'", 26'", 26 V, 26 VI, 26 VII), wherein the battery monitoring comprises components or assembly groups, a sort of monitoring electronics (4, 104, 104', 504, 604, 604', 704) with one receiver (5, 5', 105, 105', 505) and several measuring electronics (7, 7', 7", 7"', 107, 107', 107", 107'", 107 IV, 107 V, 207, 207', 707, 807, 907) that are arranged spatially separately from the monitoring electronics (4, 104, 104', 504, 604, 604', 704), each for measuring at least one measurement inormation (213, 813) for a state of the energy storage package (3, 3', 3", 3'", 103, 103', 103", 103'", 103 IV, 103 V, 203, 403, 503, 503', 703, 803), and each of the measuring electronics (7, 7', 7", 7"', 107, 107', 107", 107'", 107 IV, 107 V, 207, 207', 707, 807, 907) comprises a dedicated measuring device (9, 9', 9", 9'", 9 IV, 9 V, 9 VI, 9 VII, 209, 209', 809, 809') and a transmitter (10, 10', 10", 10'", 10 IV, 110, 110', 210a, 210b, 510, 810a, 810b), wherein each transmitter (10, 10', 10", 10'", 10 IV, 110, 110', 210a, 210b, 510, 810a, 810b) of the measuring electronics (7, 7', 7", 7"', 107, 107', 107", 107'", 107 IV, 107 V, 207, 207', 707, 807, 907) has a modulator (16, 16', 16", 16"', 516) that can be controlled by means of a microcontroller (8, 8', 8", 8'", 208, 308, 408, 608, 608', 808), and wherein respectively one dedicated measuring device (9, 9', 9", 9'", 9 IV, 9 V, 9 VI, 9 VII, 209, 209', 809, 809') is assigned to at least two energy storage packages (3, 3', 3", 3'", 103, 103', 103", 103'", 103 IV, 103 V, 203, 403, 503, 503', 703,803), and wherein the receiver (5, 5', 105, 105', 505) comprises a demodulator (17, 517, 617), and the energy supply system (1, 1', 100, 100') comprises an energy line connection (2, 2', 702, 702'), with which either the individual energy storage packages (3, 3', 3", 3"', 103, 103', 103", 103"', 103 IV, 103 V, 203, 403, 503, 503', 703, 803) or the individual interconnected energy storage packages (3, 3', 3", 3"', 103, 103', 103", 103"", 103 IV, 103 V, 203, 403, 503, 503', 703, 803) are linked, wherein the demodulator (17, 517, 617) is connected to lines (15, 15", 115, 115', 215, 415, 815), which are connected to the energy line connection (2, 2', 702, 702'), and respectively one measuring device (9, 9", 9 IV, 9 VI) is electrically connected to respectively one energy storage package only (3, 3', 3", 3"', 103, 103', 103", 103'", 103 IV, 103 V, 203, 403, 503, 503', 703, 803) via at least one connection (11, 11', 11", 11'", 111, 111', 111", 111'", 111 IV, 111 V) and the connection (11, 11', 11", 11"', 111, 111', 111", 111'", 111 IV, 111 V) for the respective measuring device (9, 9", 9 IV, 9 VI) has at least one measuring point (12, 12', 12", 12'") respectively in one single energy storage package (3, 3', 3", 3"', 103, 103', 103", 103'", 103 IV, 103 V, 203, 403, 503, 503', 703, 803), by means of which (12, 12', 12", 12'") an electrical voltage can be measured, and wherein each measuring electronics (7, 7', 7", 7"', 107, 107', 107", 107'", 107 IV, 107 V, 207, 207', 707, 807, 907) furthermore has its dedicated microcontroller (8, 8', 8", 8'", 208, 308, 408, 608, 608', 808), and wherein at least one of the modulators (16, 16', 16", 16"', 516) is electrically connected with the energy line connection (2, 2', 702, 702') and comprises a unit, by which a signal (419, 719) can be modulated on to the energy line connection (2, 2', 702, 702'), wherein information (213, 813) gathered by the measuring electronics (7, 7', 7", 7"', 107, 107', 107", 107'", 107 IV, 107 V, 207, 207', 707, 807, 907) is coded in the signal (419, 719), which is transmissible via the energy line connection (2, 2', 702, 702'), and wherein the demodulator (17, 517, 617) of the receiver (5, 5', 105, 105', 505) is designed for reception of a signal (419, 719) that is modulated on the energy lines (15, 15', 115, 115', 215, 415, 815), so that the receiver can receive and decode (5, 5', 105, 105', 505) the information (213, 813) originating from the measuring electronics (7, 7', 7", 7"', 107, 107', 107", 107'", 107 IV, 107 V, 207, 207', 707, 807, 907), wherein the receiver (5, 5', 105, 105', 505) comprises a low voltage circuit (329, 429), a time discretization member (443, 643) and a digitizing member, characterised in that the signal (419, 719) is presented to the digitizing member as D.C.-voltage-reduced signal, which, after passing through the digitizing member, is available transformed into signal values in a stage that comprises an addition unit for signal values and a storage (224, 624, 824) for several of the signal values for combining some of the several signal values recorded and digitized at different points in time, wherein the signal value is weighted in a computing stage by multiplication with a factor that is assigned to a time interval from a discrete point in time up to a recording of the signal and the signal values are subsequently added in the addition unit for a weighted addition.