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Anyone know of a 240v power meter?

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I was going for the non-obvious and non-$5,000 option ;)

Since this is just for private accounting between yourself and the parking garage, how about something like this:

http://www.efergy.us/index.php/usa/products-usa/elitev3-monitor-usa.html

Cheaper and simpler than a real in-line meter, and they can even put the display unit in their office/kiosk for easy reading.

Not quite as accurate as a 'real' meter (though pretty close), but they will presumably be marking up the cost of the power anyhow so the odd 1% here or there won't matter.
 
Since this is just for private accounting between yourself and the parking garage, how about something like this:

http://www.efergy.us/index.php/usa/products-usa/elitev3-monitor-usa.html

Cheaper and simpler than a real in-line meter, and they can even put the display unit in their office/kiosk for easy reading.

Not quite as accurate as a 'real' meter (though pretty close), but they will presumably be marking up the cost of the power anyhow so the odd 1% here or there won't matter.

Thank you. I'll look into that one and this one:

Single-phase energy meter for 120/240 Volt, 3-wire 60Hz EKM-25IDS-N v.2
 

I've been looking at that same meter. I have an Energy Detective for the whole house, but I don't like the software it uses. The EKMMetering looks more raw and better documented. I might write some software for the EKM meter if it seems like a quality device. One thing I wonder about EKM-25IDS-N is that I do not see a neutral actually connected to the meter. Without it, I don't see how that meter can accurately measure and imbalanced load on one of the legs. Not an issue for the Tesla which would always be a 240v load, but I'm curious.