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How is the output power rating of the charger calculated?

April 26, 2017calculated charger output power rating

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How is the output power rating of the charger calculated?

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The output power rating of an industrial battery charger is based on the size of the connected batteries in amp-hours (AH) plus any standing (permanent) load current drawn by connected devices. A battery can deliver a specified amount of current for a given period of time within a voltage band. In theory a 100AH 12V battery will deliver 10 amps for 10 hours or 100 amps for 1 hour at a voltage of 13.6 down to 10.5 volts DC. It can be safely recharged at 10% of its nominal capacity so a 10-amp charger with a 12-volt nominal output voltage is required.