If you're going to install an L2 EVSE you can find one with a meter included. I purchased one from forum member vegasbrad. Google BSA Electronics and you'll get to his website. He's very good to work with and will build what you want. The meter gives a readout for the last session as well as a total overall Kwh. The total is pretty much like the meter on your house - make note of the current total and and check it again a month later; subtract one from the other and you know how much kwh you used for the month. Here's a couple of pics of my setup right after I installed it. The 72 Wh is the current charge session (I was basically at full SOC when I plugged it in) and the 7 Kwh is the total use sent through the EVSE (in this case the 7 Kwh is the result of his after build testing).