Add summation of current electrical current draw about mycodo HOT 5 CLOSED

Categories to display for current draw (in Watt-Hours):
Past Hour
Past Day
Past Week
Past Month
Past Year
Custom Month range (such as the day your electric bill is measured, so the nth day of the month to the next nth day of the month can be measured)

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Additionally, to calculate watts, the number of volts will need to be configurable (US uses 120VAC, EU and most of the rest of the world uses 240VAC).
Maybe even allow the generation of a graph of power usage, but this is now getting pretty complex for a simple feature.

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Added in 36f62b8

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Add options "price per kWh" and "currency unit" (keyboard character) to add another row on the Relay Usage table to calculate the estimated cost.

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That worked out quicker than I thought. Added in b79e1fc

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