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This is the final iteration, minus fuses.
Starting bottom left, the 17.6R, 4 x 12R, 4R and corresponding current values, represent each appliance at max load and are not part of the circuit as such. That way, I can get an accurate reading of the total current demand on the power supply.
The dew heater element, 17.6R is switched between HIGH and LOW through a mosfet, at this stage - the Arduino digital pin voltage and setting is represented by the 5v supply and switch.
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