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How big an alternator do you need ?

Since a lot of this blog is about electronics I presume that you – like me – may have been busy adding all sorts of gizmos to your boat. Well, the time comes when you had better check the electrical consumption of all those useful devices and aids!. I thought I would do that and see if the battery and alternator configuration that I have is adequate.

I have two domestic batteries and one engine battery each of 60 amps and normal lead acid types. This is a perfectly standard installation and is charged using a 120 amp alternator.

So my maximum daily consumption of electricity must not exceed 120amp hours without recharging the batteries in a marina or by using the engine.

Here are three assessments of electrical consumption – I have tried to be reasonably extravagant in my assumptions about turning lots of lights on and using every piece of nav equipment at once…

Sailing Marina Anchor
energy-sailing-1 energy-marina energy-anchor

To download my free Excel spreadsheet showing how to assess your power usage while at marina, anchor, or sailing please click here

I would be interested in your experiences…

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