NO, cost per kwh does not change....the caveat in your statement is "adequate wiring".
Real world wires have resistance and you will lose a small but measurable amount. The voltage drop as a percentage of the total becomes smaller and smaller as the voltage goes up.
Let's look at 100 feet of 10 AWG wire carrying 5 amps. At 110 volts I lose 1 volt at the end for .91% voltage loss. At 440 I still lose 1 volt but my percent loss drops to .23%. This is with a 10 AWG copper wire at .0009989 Ohm/foot.
It just depends on what you mean by adequate wiring. To cut the loss in half in this example you could go to 7 AWG wire. At some point it gets ridiculous.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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