Trying to determine dc current - 12v lead acid battery charger

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  1. - 22nd June 2012, 08:12 #6
    Aussie Barry's Avatar
    Aussie Barry
    Aussie Barry is offline Member
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    Default Re: Trying to determine dc current - 12v lead acid battery charger

    Hi Rob,

    Is the 0R1 shunt resistor connected on the high side or low side of the load?
    If it is on the low side then you should only need one ADCin measurement; the second leg of the shunt being directly connected to ground.
    The maths becomes very simple, measure the voltage drop across the shunt resistor and scale directly to Amps or MilliAmps as required.

    Cheers
    Barry
    VK2XBP

    Edit: Ignore my last post. I was typing this as you were sending the circuit diagram...
    Last edited by Aussie Barry; - 22nd June 2012 at 08:18.
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