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Shaft Generator - Output Capability

Shaft-generator available electrical power given main-engine load and PTO design capacity - enables one-generator-at-sea config on slow-steaming.

PTOShaft generatorDecarb
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Formula, assumptions, and limits

PPTO=min(Prated, PMErres)ηPTOP_{PTO} = \min(P_{rated},\ P_{ME} \cdot r_{res}) \cdot \eta_{PTO}
SymbolMeaningUnit
PratedP_{rated}PTO rated capacityMW
PMEP_{ME}Main-engine outputMW
rresr_{res}Propulsion reserve factor
ηPTO\eta_{PTO}PTO efficiency

Source: MAN ES PTO/PTH/PTI Project Guide

In short

Shaft-generator available electrical power given main-engine load and PTO design capacity - enables one-generator-at-sea config on slow-steaming.

Learn the theory Marine Electrical Generation and Distribution