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Integrating PW2 with a smarter house/car charging

Integrating PW2 with a smarter house/car charging

I have posted in the general forum but now PW II users have their own I will post here.
I have a small PWII setup and 10kWp solar. My wife runs a Chevy Volt and I drive a Golf GTE (both PHEV). I have a deposit on an M3 but since I live in the UK we've not been told whether it will arrive in this decade (if it ever will).
My goal is to minimise my energy bills.

The first info I wanted was to view my generation, battery state and demand over a reasonable period of time - so the rather limited Tesla app wasn't any help.
Luckily there is some JSON data available on the PWII gateway and with a few lines of Powershell I have created https://www.bowmill.net/xmenu/powersoc.shtml
Fronius also expose similar data so there are corresponding pages for the inverters. The jury is out on the best way to monitor use. I started using plug adapters from a company called CurrentCost but I think they disappeared so I am trying Vera (z-wave) but finding their boxes very unreliable.

I have been controlling the charge rate on the Volt via the ODB port but this method seems to have caused quite a few premature failures of the attached charger (3 so far).

Zappi http://myenergi.uk/product/zappi/ looks promising but, as yet, they have no published API

The reason for this post is to see if anyone else is having any success playing in this area/has any pointers to interesting hardware/has any examples of similar work.

Steve