How do you choose a marine generator? Learn how to evaluate power (kVA), frequency, fuel, prime vs standby, and class certification step by step.
A ship's electrical supply is vital — from navigation systems to the galley, refrigeration to lighting. The marine generator that produces this power, if chosen incorrectly, means either insufficient supply or high fuel cost. This guide answers how to choose a marine generator, step by step, through the critical selection criteria.
A marine generator produces a ship's electrical power through an alternator driven by a diesel engine. Vessels usually carry more than one auxiliary generator — one running while another stands by — providing critical redundancy for uninterrupted power at sea.
The most commonly confused topic is the power rating. Prime power runs continuously under variable load and is used as the main generator. Standby power is emergency power that engages only when the main source fails. The wrong rating either wears the generator out or creates unnecessary cost.
Whether you need a complete generator or a spare part, you can browse supplier listings on e-ShipSupply, search by IMPA code, and request quotes directly. Generator spares (filters, injectors, AVR, alternator parts) are usually identified by IMPA codes, helping you find the exact part without error.
A prime generator is designed for continuous/main power; a standby generator is for short emergency use only. Using a standby unit continuously leads to failure.
Search the part by IMPA code or by brand/model through supplier listings.
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14 Jul 2026
