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Car Battery Charging Amperage vs Wall Amperage

Car Battery Charging Amperage vs Wall Amperage

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#1 21676137 23 Jun 2016 02:35

John Franklin John Franklin

Anonymous

Post #1
21676137 23 Jun 2016 02:35

Pardon my naivete but--how does a charger deliver a 60A charge while plugged into a household system with breakers that trip well below 60A? Thanks for any help!
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#2 21676138 23 Jun 2016 12:24

Dean Franks Dean Franks

Anonymous

Post #2
21676138 23 Jun 2016 12:24

Amperage is not conserved.

Wattage delivered to the battery = wall wattage - heat loss in charger

Wattage = current * amperage

So, assuming perfect efficiency, a 12V 60A charger would deliver and use 720 watts of power. On the input side, you have approx 120V (US), so the charger would draw 6A from the plug.

The actual plug amperage will be slightly higher as chargers are not perfectly efficient with 70-90% efficiency being typical of modern chargers.
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Car Battery Charging Amperage vs Wall Amperage

Car Battery Charging Amperage vs Wall Amperage

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