How long will it take for a certain current rating charger to fully recharge a given size battery?

This can be calculated approximately as follows. The recharge time in hours equals the battery capacity in Ah, multiplied by the Depth of Discharge in %, multiplied by 0.8, multiplied by 1.5, divided by 100 times the charger current rating in Amps, plus one hour. For example, a 55Ah battery, discharged to 80%, on a 6-Amp charger, would take about 9.8 hours.

A 110 Ah battery, discharged to 50%, on a 10 Amp charger, would take about7.6 Hours. The battery reaches 80% recharge relatively quickly, the last 20% of the charge is done in constant voltage mode where the current is dropping exponentially, so it is charging more slowly, this is the reason for the 1.5 factor and the plus one hour constant. Our chargers usually provide an indication when the 80% level and switch to CV mode has been reached (either an indicator Led marked 80%, or the Charge Led starts to flash) showing that the battery could be used at this point, with some loss of run time.

At the end of the charge cycle, the ... more.

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