Shunt Resistor Location
One thing I would like to suggest Rosemary, is that unless you specifically require that the 0.25 Ohm shunt resistor be placed in series with the MOSFET Source for some good reason, I strongly suggest that it be relocated to be in series with the battery.
Having that resistor, even as small as it is, affects the operation of the MOSFET switch, especially if that resistor is somewhat inductive, although it should not be if it is a carbon resistor, which I believe you are using. Nonetheless, it is not good practice to place the resistor there if all you want to do is monitor current consumption from the battery.
Please specify why you require it there in the MOSFET Source instead of in series with the battery?
.99
One thing I would like to suggest Rosemary, is that unless you specifically require that the 0.25 Ohm shunt resistor be placed in series with the MOSFET Source for some good reason, I strongly suggest that it be relocated to be in series with the battery.
Having that resistor, even as small as it is, affects the operation of the MOSFET switch, especially if that resistor is somewhat inductive, although it should not be if it is a carbon resistor, which I believe you are using. Nonetheless, it is not good practice to place the resistor there if all you want to do is monitor current consumption from the battery.
Please specify why you require it there in the MOSFET Source instead of in series with the battery?
.99
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