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Breaking down onboard consumption, what each device draws
Breaking it down, what makes up the continuous load is refrigeration,
navigation and lighting together, times twenty-four hours, divided by twelve volts.
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The fridge is almost always the biggest item, because it cycles around the clock. Navigation and autopilot only come in when you are under way, lighting only in the evening. Break your consumption down and you usually find one device that draws more than all the others put together.
The daily consumption sets the size of the battery bank: with lead acid you need twice as much, because only half of it is usable. And that raises the question of how it is recharged, by alternator, solar or shore power.
The entire electrical installation counts as equipment and has to be included in the sum insured. Lithium also has to be declared: the battery and the charging system must be listed on the application, because they behave differently from lead acid in a fire.
Frequently asked questions
Which device draws the most?
Usually the fridge, because it runs around the clock.
Do I have to declare the electrical installation?
With lithium batteries, yes.
The rest of the installation has to be included in the sum insured.
Worked out for your type of boat
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