Emergency Generator

The emergency generator is a self-contained power source required by SOLAS Chapter II-1/42 on passenger ships and Chapter II-1/43 on cargo ships, located outside the main machinery space and above the deepest load waterline so that it remains available even if the engine room is flooded or on fire. It starts automatically within 45 seconds of main power failure and supplies essential services including emergency lighting, steering gear indication, fire detection and alarm systems, navigation lights, internal communications, radio installations, and the emergency fire pump. The emergency generator must be capable of operating for at least 18 hours on cargo ships and 36 hours on passenger ships at the design load. Monthly no-load test runs and annual load tests are required by SOLAS and class rules, with results recorded in the deck and engine-room logs. Engineers must verify that the starting arrangement — usually automatic and manual battery start — is functional and that the transition contactors and preferential trip systems operate correctly. Port state control inspectors routinely test emergency generator start-up as part of safety equipment inspections and may detain vessels where the system is found to be non-functional.