What sort of accuracy are you expecting with this energy meter?Current only sensing energy meters can be highly inaccurate as they dont measure the voltage.So with loads that have a power factor of less than 1 , the meter will read incorrectly.Loads that have switch mode power supplies in them , like computers or plug packs will read even moreinnacurately, due to the current waveform not being sinusoidal.
If you really want to measure energy accurately, you are far better off using a device specificallyfor this purpose like a ADE5569.http://www.analog.com/en/analog-to-digital-converters/energy-measurement/ade5569/products/product.htmlIt does all the hard work for you.
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