Duty cycle: Marine Air Conditioning Definition
The proportion of time the compressor actually runs once the cabin is at temperature.
Duty cycle in a Boat Air Conditioning System
The number that decides what a system really costs to run and whether a battery bank will carry it overnight. A fixed-speed unit cycles at roughly 60 % once cold; a variable-speed one throttles to about 45 %. Hours switched on and hours actually running are different numbers, and it is the second one that matters.
Using Duty cycle Specifications in Quotes and Manuals
Use this definition to understand a quote, manual or fault report—not as an instruction to modify the boat. Before buying, compare the wording against the current manufacturer documentation. For refrigerant, fixed 240 V wiring or below-waterline work, use the official licensing and standards sources and an appropriately qualified tradesperson.
Start with the complete system guide for context, or check the owner questions for plain-language answers. Technical information can change or be wrong; the disclaimer explains the limits.