I'm starting to think about adding a 50 amp circuit and NEMA 14-50 outlet in my garage. I'd like to add some sort of meter just for that circuit, so I can keep track of just the electricity I use to charge my car. Ideally, I'd like a box with either an ethernet jack or wifi. Something where I can slurp the data and store it, so I can go back and look at the history. I found this article: EKM Digital Submeter Measures EV Charging Efficiency But the meter it talks about using sounds like it just has a digital readout. Alternately, I found this device: rainforest automation Eagle Energy Gateway Which sounds like it will do all of the networking/cloud stuff that I want, but it talks to your house's smart meter, so it will show usage of the whole house, not just the one circuit. Does anybody else have ideas?