Maintaining continuous power on the ship is one of the most important tasks while sailing. However, sometimes accidents are inevitable and due to some reason such as breakdown of machinery, technical snag etc. there can be a power failure on the ship. In case of blackout there should be an alternate source of power available and which should come on load automatically. Alternate source of power are taken from batteries and emergency generators to provide power to critical equipments. As batteries cannot provide power for a longer period of time, emergency generators are preferred.