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Well, Tony answered the question, but I think the more interesting data to collect is ENERGY not power. That is more difficult than the simple real-time voltage and amperage display linked above.The cheapest thing I've found is this kit:Leviton Mini-Meter with CTsHowever, you have to count the pulses output by that unit to accumulate the energy. That would be a good job for an Arduino, but definitely not a turnkey solution. The actual meters that do energy accumulation are at least $200 more depending on what, if any, communication ports they have. A complete sub-meter solution with an embedded web server would be about $1,000.The more common solution is to get a whole-home energy monitor and measure the EVSE circuit separately in that system. There is a thread here talking about those.
Well, Tony answered the question, but I think the more interesting data to collect is ENERGY not power. That is more difficult than the simple real-time voltage and amperage display linked above.
The cheapest thing I've found is this kit:
Leviton Mini-Meter with CTs
However, you have to count the pulses output by that unit to accumulate the energy. That would be a good job for an Arduino, but definitely not a turnkey solution. The actual meters that do energy accumulation are at least $200 more depending on what, if any, communication ports they have. A complete sub-meter solution with an embedded web server would be about $1,000.
The more common solution is to get a whole-home energy monitor and measure the EVSE circuit separately in that system. There is a thread here talking about those.
