You might want to consider an eMotorWerks WattBox 200 WiFi connected "virtual" submeter like we installed in August as part of SCE's PEV Pilot Program.
Electric Motor Werks, Inc. - Electric Motor Werks, Inc.
Our WattBox provides us with two SCE "Service Accounts" under our "Customer Account":
home on TOU-D-B-SDP 1,043 kWh = $164 = 15.75¢ / kWh (SDP = Summer Discount Plan)
Tesla on TOU-EV-1 195 kWh = $25 = 12.86¢ / kWh
Here's our WattBox and HPWC setup:
View attachment 107364
I'm nearby in Newport Coast if you want to see our Wattbox "virtual" SCE submeter first hand.
The other benefits using WattBox virtual meter and OhmConnect.com and participating in their #OhmHour program:
1. OhmConnect earned us $25 in credits in just 5 months. Not a huge amount in $$$ but a significant discount % off our Tesla electric bill (10% to 20%)
2. We also get a web portal with detailed statistics and graphs of our Tesla charging
WattBox installation was simple and fast... and might save you a LOT vs. an actual separate meter.
Other advantage of WattBox virtual meter is it's easy to go back to one meter... which might make sense if we add solar.