On 08/04/16 14:23, whisky-dave wrote:

No it isn't and it's already been done with E7.

Nothing like the same problem. The E7 simply records the whole house's
consumption and switches the recording to a different meter for a
specified period (be it time based or radio-switched).

You can plug anything into the main but yuo won't get the E7 rate until
the meter in yuor house tells you you can.

How exactly is that related to your meter recording how much your car
takes to charge, separated out from all the other load?

And even if you mandate that the car line signals over the mains wiring
to the meter[1], how does that get around:

a) Blocking the signal with filters?

b) Putting a big UPS in the way and charging that, then using that to
charge the car (tedious perhaps, but nevertheless).

The only sensible idea is mandating the meter is built into the car
itself. All this talk of somehow making the main house meter record "car
taxable" and "non car" consumption is nonsense. It's non trivial, too
easy to get around and too costly to implement.

Look, the bloody government can't even get "ordinary" smart meters right
with a single standard. How the hell are they going to pull off a stunt
like this?

I think it's you who hasn't thought this through!