Why does the voltmeter reading alternate between say 12.35 and 12.40 volts?
Either because the battery voltage has ripple on it and SmartGauge is displaying the measurement from different points in the ripple on each measurement or because the battery voltage is directly between these two readings. A normal DC voltmeter can severely filter the input to remove any ripple thus giving the illusion of continuous, identical, readings, however this ripple is very important as far as it’s effect on the battery is concerned therefore SmartGauge needs to be able to measure it and therefore displays the actual voltage at the time of the measurement as opposed to an average over several measurements.
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