This change in current must be due to the voltage on the supply changing, thus we actually need to know the resistance of each load, and the output voltage of each source. Then the current on the system is then calculated from Ohm's Law, V=IR, or in this case I=V/R.
Well, since you know the nomincal current draw and the operating voltage, it is easy to calculate the (average) resistance at runtime.
Erik
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