Thats for the info everyone!
@jonescg The charging a battery looks interesting... if I went that route I would get a proper home battery system and just charge that during the day, then discharge to the car battery at night.. not very efficient though and increases cycles on the home battery unit.
Also you might be blessed with unlimited sunshine over there in WA but here in Tassie you can't exactly predict the sunny hours with a timer.

It could look like a nice day at 8:30 then at 10:00 it's pouring rain!
@HuffnPuff I haven't considered V2G at the moment, certainly an option though. I do think that grid services will be available via other means, such as controlled load EV chargers, which (when there are enough EVs in service and plugged in simultaneously) will be just as beneficial and better for battery health.
I guess in the future we'll have something like an energy router for our home. Think of a box with lots of connections:
- Grid
- Solar
- Home battery
- Residential load
- EV (x2)
And it routes between them all based on certain conditions. The Powerwall app (and now doubt other battery providers) has this feature right now - for the first four items of the list above. Only very basic conditions (e.g. prefer the battery over the grid) although it's just software....