Everything you 'switch on' consumes electricity, even the panel lights and voltmeter, Add up the amp hours per day of everything you use to see what battery capacity and charging arrangements are necessary. Although the fridge is 'ON' all day, the compressor runs only as demanded by the outside temperature and the thermostat setting. All other consumptions are a guess at how long each item is used per day.

Pat Manley is a Yachtmaster instructor and also teaches courses on radar, diesel engines and radio. He is one of Practical Boat Owner's panel of experts.

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