Amps in - amps out

[Andrew_B]

Does anyone know roughly how many amps a 10 amp batterycharger would draw from the 220v supply whilst charging batteries at full rate.

Thanks

Andrew

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[andyball]

In theory, well under 1 Amp, but some transformers take a large initial surge when switched on.

Divide the output voltage by the mains voltage...12/220=0.054, & multiply the current out (10Amps) by this figure to find the mains current....so 10 * 0.054 = 0.54 Amps.

But real life electrics is never 100% efficient so add a bit on.

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