control system and control method for a power supply uninterruptible

This system includes a power source (1) comprising a battery (12) supplying a direct current and supplying an alternating current from a power source to alternating current (4) by converting the alternating current into direct current, an electronic system (3) powered by the current from the power source (1), and a control device (2) for calculating the energy consumption of an electronic system (3) as the latter works by being powered by direct current, and calculating a battery life based on its residual capacity and the value of the energy consumption. particularly applicable to control systems of a source uninterruptible power supply.