Just put a deposit down on an iX 50 so need to think about an EV charger. Being a newer house we have the wiring already for an EV just need the wall charger fitting. We have solar/batteries from FoxESS so does it make sense to go with the Fox charger ?
I wouldn’t use the existing wiring because it will be into your main consumer unit.
The issue with smart charging is that it can happen at any time, literally any time.
If your battery system can see the load from the charger (and it can because it will be in the main consumer unit), the battery will fill the demand.
So if octopus/edf/eon etc decide to charge your car at 8:43pm with no notice, your battery will dump whatever it has left into the car.
You can get fixed time period tariffs where energy is cheap but they are priced higher. As more renewables come on the grid, I can only see the gap between them and the ‘dynamic’ versions widening. For example, at this time of year, the cheapest energy is available from 11am-2pm.
The solution has 3 options:
1) only use the more expensive time of use tariffs which have a fixed overnight period.
2) use 3rd party controls like home assistant to monitor for EV charging and make sure the battery is charging at the same time
3) electrically ‘blind’ your solar/battery system to your EV charger.
This involves splitting the supply cable just after the meter, installing a small standalone consumer unit which only supplies the EV charger.
The CT clamp which your solar system uses to monitor power consumption is place after the EV charger on the cable which goes to the house consumer unit.
#3 is the best long term fail safe solution. Any competent installer should know how to achieve this with your install, if they don’t, bin them.