Yes, you could run a small off-grid set up with PV solar management box feeding into battery and EV-charging port installed by an accredited electrician.
The only downside to this set-up is the lack of charging abilities during the darkest days of winter.
The second option would be to create a PV solar-charging station similar to the ones at motorway service stations with primary solar charge and spurred from the home supply as back-up.
Third option is to just install PV solar capabilities to benefit the main house and then your EV-charging can feed on that home set-up and installed by our MCS accredited installers.
However, (I suspect) the battery storage on the first and second option would have to be Li-on and sized to match the EV’s battery size, which makes the third option to be much more sensible.
I hope one of our installer contributors can confirm this?