What are requirements for duration of emergency power supply as per SOLAS ?

1. The general alarm;
2. The fire detection and fire alarm system;
3. The daylight signalling lamps, ships, whistle and manually operated call points, intermittently, and
4. The statutory navigational equipment and aids;

(d) For the period of 18 hours;

1. The navigation lights, and
2. Any fire pumps and emergency fire pumps dependent upon the emergency generator for their source of power.