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Calculating charging time, recharging the battery under power
Calculating the time for recharging is simple:
divide the capacity you need to put back by the charging current; with lead-acid,
add around twenty per cent for losses.
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In theory, a two-hundred-amp-hour bank that is half discharged needs a good three hours at a charging current of thirty amps. In practice, lead-acid only accepts the full current up to about eighty per cent state of charge, and after that it takes considerably longer. Anyone who wants a full charge every day needs either more current or more time under power.
Running the engine purely to charge is expensive and does the engine no good, because it never reaches operating temperature. Solar panels or a shore-power charger are the better solution.
As far as the insurance is concerned, what matters is that the installation is done properly. Chargers, inverters and batteries are part of the equipment and have to be allowed for in the sum insured. With lithium, the system has to be declared on the proposal form; check whether the policy includes battery, charging equipment, animal bite damage and short circuit.
Frequently asked questions
How long does charging take?
Capacity divided by charging current, plus around twenty per cent for losses with lead-acid.
Are the charger and the inverter insured?
Yes, as permanently fitted equipment, provided the sum insured covers them.
Worked out for your type of boat
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