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EmonLib
Electricity monitoring library - install in Arduino IDE's libraries folder then restart the IDE
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
I use Open Energy Monitor gear at home to monitor my (wholesale) power price and solar generation. They have off-the-shelf gear for EV chargers where the feed wattage is controlled. All you would need is a billing aspect.
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